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  • Springer  (92,024)
  • American Association for the Advancement of Science  (6,796)
  • 2010-2014  (90,836)
  • 2005-2009
  • 1980-1984
  • 1935-1939  (7,984)
  • 1925-1929
  • 2011  (90,836)
  • 1938  (7,984)
Collection
Years
  • 2010-2014  (90,836)
  • 2005-2009
  • 1980-1984
  • 1935-1939  (7,984)
  • 1925-1929
Year
  • 1
    Publication Date: 2021-05-17
    Description: This special issue is dedicated to Yuri Taran's outstanding contributions to gas geochemistry that began in the early 1980s with his work on deuterium and 18O compositions of geothermal waters in the Mutnovsky (Kamchatka) region and continues to this day with work on the Kamchatka volcanic volatile budget, carbon isotopes of hydrocarbons, and new insights into the geochemistry of El Chichón volcano, Chiapas. Yuri has contributed greatly to the field of volcanic gas geochemistry and was the first to recognize the distinct deuterium and oxygen isotopic composition of fumarole condensates from volcanoes in Kamchatka (Taran et al. 1987a). The shift in δD and δ18O to significantly heavier values compared to local meteoric water led Yuri to introduce the term “andesitic water” (Taran et al. 1989a, b) which has since been recognized at subduction zone volcanoes globally. This distinct isotopic composition is evidence that volcanoes release water that ultimately originates as subducted seawater and is recycled through the mantle wedge back to the earth's surface. Yuri's early work on the gas emissions from Kamchatka and Kurile Islands volcanoes also included the development and testing of gas geothermometers (Taran 1986) and investigating hydrothermal alteration using isotopic data (Taran et al. 1987b). His curiosity remained focused on the isotope systematics of volcanic gases discharging from Kamchatka and the Kuriles through the late 1980s and 1990s with publications on the gas compositions of Klyuchevskoi (Taran et al. 1991), Mutnovsky (Taran et al. 1992), Avachinsky and Koryaksky (Taran et al. 1997). Yuri was involved in the discovery of a pure and unique rhenium mineral on Kudryavy volcano (Korzhinsky et al. 1994) and provided one of the most detailed chemical studies of high temperature (up to 950°C) fumaroles to date of any volcano (Taran et al. 1995). His 1995 paper on Kudryavy remains highly cited and provides the highest quality volcanic gas data which also include trace elements from a subduction zone. Such data are crucial when we attempt to interpret lower temperature volcanic gas compositions or calculate rare metal fluxes from volcanoes worldwide. His most recent publication on Kamchatka-Kurile volcanic emissions provides a detailed analysis of the total gas flux from these volcanoes (Taran 2009).
    Description: Published
    Description: 369-371
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: reserved
    Keywords: Fluids Geochemistry ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2020-11-18
    Description: By analyzing surface latent heat flux (SLHF) data from the NCEP/NCAR Reanalysis Project for the period three months before and after the Sept. 3, 2010 MS 7.1 New Zealand earthquake, an isolated SLHF positive anomaly on Aug. 1, 2010 was found with a high value of about 160 W/m2 to the northeast of the epicenter. Historical data, background pixels, and wavelet transforms of time series were comprehensively analyzed to study the spatiotemporal features of the SLHF anomaly. After removing the influences of wind speed and cloud cover, the key factor leading to local SLHF anomalies is the surface temperature increment. Combined with GPS displacement observations and tectonic settings, we determined that the physical mechanism of the SLHF anomaly could possibly be attributed to hot underground materials related to high-temperature and high-pressure upwelling from the deep crust and mantle along the nearby subduction zone, thereby explaining the local temperature increment to the northeast of the epicenter, as well as in the center of the North Island and the southwest of the South Island. Furthermore, it changed the specific humidity between the ground and surface air, causing the local SLHF increment.
    Description: Published
    Description: 3273-3280
    Description: 1.7. Osservazioni di alta e media atmosfera
    Description: 1.10. TTC - Telerilevamento
    Description: 3.1. Fisica dei terremoti
    Description: JCR Journal
    Description: open
    Keywords: remote sensing ; earthquakes ; precursors ; 01. Atmosphere::01.01. Atmosphere::01.01.05. Radiation ; 04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2020-12-15
    Description: Four sediment cores were analysed in order to determine the sedimentary processes associated with the channel-ridge depositional system that characterise the George V Land continental margin on the Wilkes Land. The sedimentary record indicates that the WEGA channel was a dynamic turbiditic system up to M.I.S. 11. After this time, the channel became a lower-energy environment with sediments delivered to the channel through high-density bottom waters that we identify to be the high salinity shelf waters (HSSW) forming on the shelf area. The HSSW entrains the fine-grained sediments of the shelf area and deliver them to the continental rise. The biostratigraphy and facies of the sediments within the WEGA channel indicate that the HSSW down flow was active also during last glacial. The change from a turbiditic system to a lowenergy bottom current system within the WEGA channel likely reflects a different ice-flow pattern, with ice-sheet reaching the continental shelf edge only within the ice trough (ice stream).
    Description: Published
    Description: 909 - 926
    Description: 2.2. Laboratorio di paleomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: High salinity shelf water ; Turbidity currents ; Glacio-marine depositional processes ; Marine isotopic stage 11 ; Glacial dynamic changes ; 02. Cryosphere::02.02. Glaciers::02.02.05. Ice dynamics ; 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport ; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2012-02-03
    Description: The Italian strong-motion database was created during a joint project between Istituto Nazionale di Geofisica e Vulcanologia (INGV, Italian Institute for Geophysics and Vulcanology) and Dipartimento della Protezione Civile (DPC, Italian Civil Protection). The aim of the project was the collection, homogenization and distribution of strong motion data acquired in Italy in the period 1972–2004 by different institutions, namely Ente Nazionale per l’Energia Elettrica (ENEL, Italian electricity company), Ente per le Nuove tecnologie, l’Energia e l’Ambiente (ENEA, Italian energy and environment organization) and DPC. Recently the strong-motion data relative to the 23th December 2009, Parma (Mw = 5.4 and Mw = 4.9) and to the April 2009 L’Aquila sequences (13 earthquakes with 4.1 ≤ Mw ≤ 6.3) were included in the Italian Accelerometric Archive (ITACA) database (beta release). The database contains 7,038 waveforms from analog and digital instruments, generated by 1.019 earthquakes with magnitude up to 6.9 and can be accessed on-line at the web site http://itaca. mi.ingv.it. The strong motion data are provided in the unprocessed and processed versions. This article describes the steps followed to process the acceleration time series recorded by analogue and digital instruments. The procedures implemented involve: baseline removal, instrumental correction, band pass filtering with acausal filters, integration of the corrected acceleration in order to obtain velocity and displacement waveforms, computation of accel- eration response spectra and strong motion parameters. This procedure is applied to each accelerogram and it is realised to preserve the low frequency content of the records.
    Description: Published
    Description: 1175-1187
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: JCR Journal
    Description: open
    Keywords: Strong motion ; processing ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    Springer
    Publication Date: 2017-04-04
    Description: Pioneering works on the magnetic anisotropy of rocks were carried out during the 1940s and 1950s (Ising, 1942; Graham, 1954). These authors first realized that magnetic methods may be used to characterize the preferred orientation of minerals within the rock samples. Ising studied varved clays in Sweden and noticed that the magnetic susceptibility was higher on the bedding plane than orthogonally to it. Graham recognized that the anisotropy of magnetic susceptibility (AMS) may be regarded as a petrofabric element; he later extended the analysis to various sedimentary rocks of the Appalachian Mountains and pointed out the existence of distinct and systematic relationships of the magnetic properties with structural setting (Graham, 1966). The studies progressively developed in the following decades and a first comprehensive review on magnetic anisotropy and its application in geology and geophysics was published by Hrouda (1982). Over the past 20–30 years, researches on magnetic anisotropy gained widespread use and were extended to examine the fabric in a variety of sedimentary, igneous, and metamorphic rocks (e.g., see reviews by Jackson, 1991; Jackson and Tauxe, 1991; Rochette et al., 1992; Tarling and Hrouda, 1993; Borradaile and Henry, 1997; Borradaile, 2001; Borradaile and Jackson, 2004; Tauxe, 2005; Lanza and Meloni, 2006; Hrouda, 2007). Presently, the study of the magnetic anisotropy of rocks is still one of the most promising research issues in the field of rock magnetism.
    Description: Published
    Description: 717-729
    Description: 2.2. Laboratorio di paleomagnetismo
    Description: reserved
    Keywords: Magnetic Anisotropy ; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 6
    Publication Date: 2017-04-04
    Description: The Italian Accelerometic Archive (ITACA) was created in 2007 during a joint project between the Italian Institute for Geophysics and Vulcanology (Istituto Nazionale di Geofisica e Vulcanologia, INGV) and the Italian Civil Protection (Dipartimento della Protezione Civile, DPC). The project, started in 2006, had the aim of filling the data gap of existing strong motion databases and facilitating strong motion data users in obtaining good quality waveforms, through the collection, homogenization and distribution of strong motion data acquired during the period 1972–2004 in Italy by different institutions (Ente Nazionale per l’Energia Elettrica, ENEL, Italian electricity company; Ente per le Nuove tecnologie, l’Energia e l’Ambiente, ENEA, Italian energy and environment organizationDPC). The compiled database contains 2,182 three-component waveforms generated by 1,008 earthquakes with a maximum moment magnitude of 6.9 (1980 Irpinia earthquake) and can be accessed on-line at the portal denominated ITACAat the site http://itaca.mi.ingv.it,where a wide range of search tools enables the user to interactively retrieve events, recording stations and waveforms with particular characteristics, whose parameters can be specified, as needed, through user friendly interfaces. A range of display options allows users to view data in different contexts, extract and download time series and spectral data. This article describes the state of the art up to 2006 and the activities which led to the completion of the project.
    Description: Published
    Description: 1159-1174
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: JCR Journal
    Description: open
    Keywords: strong motion ; database ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
    Publication Date: 2017-04-04
    Description: On 27 February 2007, a new eruption occurred on Stromboli which lasted until 2 April. It was characterized by effusive activity on the Sciara del Fuoco and by a paroxysmal event (15 March). This crisis represented an opportunity for us to refine the model that had been developed previously (2002–2003 eruption) and to improve our understanding of the relationship between the magmatic dynamics of the volcano and the geochemical variations in the fluids. In particular, the evaluation of the dynamic equilibrium between the volatiles (CO2 and SO2) released from the magma and the corresponding fluids discharged from the summit area allowed us to evaluate the level of criticality of the volcanic activity. One of the major accomplishments of this study is a 4-year database of summit soil CO2 flux on the basis of which we define the thresholds (low–medium–high) for this parameter that are empirically based on the natural volcanological evolution of Stromboli. The SO2 fluxes of the degassing plume and the CO2 fluxes emitted from the soil at Pizzo Sopra la Fossa are also presented. It is noteworthy that geochemical signals of volcanic unrest have been clearly identified before, during and after the effusive activity. These signals were found almost simultaneously in the degassing plume (SO2 flux) and in soil degassing (CO2 flux) at the summit, although the two degassing processes are shown to be clearly different. The interpretation of the results will be useful for future volcanic surveillance at Stromboli.
    Description: Published
    Description: 443-456
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: reserved
    Keywords: Stromboli volcano ; CO2 soil flux ; Geochemical monitoring ; 2007 eruption ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    Springer
    Publication Date: 2017-04-04
    Description: A repeat station is a site whose position is accurately known and where accurate measurements of the geomagnetic field vector are made at regular intervals in order to provide information about the secular variation of the geomagnetic field. In this chapter we begin by giving a brief history of the development of repeat station networks. We then describe the instruments used to make measurements at a repeat station. These include fixing the position of the station, finding the direction of true north and measuring the components of the geomagnetic field. Emphasis is given to techniques and instruments that are in current use. We next discuss the procedures that are used to reduce the measurements to a usable form and consider the uses to which the reduced data are put. Finally, we discuss the continued importance of such data in the present era of satellite geomagnetic surveys.
    Description: Published
    Description: 45-55
    Description: 1.6. Osservazioni di geomagnetismo
    Description: reserved
    Keywords: Magnetic measurements ; Magnetic Network ; 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 9
    Publication Date: 2017-04-04
    Description: We investigate the dynamics of turbulent pyroclastic density currents (PDCs) by adopting a 3D, Eulerian-Eulerian multiphase flow model, in which solid particles are treated as a continuum and the grain-size distribution is simplified by assuming two particulate phases. The turbulent sub-grid stress of the gas phase is modelled within the framework of Large-Eddy Simulation (LES) by means of a eddy-viscosity model together with a wall closure. Despite the significant numerical diffusion associated to the upwind method adopted for the Finite-Volume discretization, numerical simulations demonstrate the need of adopting a Sub-Grid Scale (SGS) model, while revealing the complex interplay between the grid and the SGS filter sizes. We also analyse the relationship between the averaged flow dynamic pressure and the action exerted by the PDC on a cubic obstacle, to evaluate the impact of a PDC on a building. Numerical results suggest that the average flow dynamic pressure can be used as a proxy for the force per unit surface acting on the building envelope (Fig. 5), even for such steeply stratified flows. However, it is not possible to express such proportionality as a constant coefficient such as the drag coefficient in a steady-state current. The present results indeed indicate that the large epistemic and aleatory uncertainty on initial and boundary conditions has an impact on the numerical predictions which is comparable to that of grid resolution.
    Description: Published
    Description: 161-170
    Description: 3.6. Fisica del vulcanismo
    Description: open
    Keywords: Large-Eddy Simulation ; pyroclastic density currents ; numerical simulation ; multiphase flows ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous ; 05. General::05.01. Computational geophysics::05.01.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 10
    Publication Date: 2017-04-04
    Description: This paper describes the damage survey in the city of L’Aquila after the 6 April 2009 earthquake. The earthquake, whose magnitude and intensity reached Mw=6.3 and Imax=9–10 MCS, struck the Abruzzi region of Central Italy producing severe damage in L’Aquila and in many villages along theMiddle Aterno River valley. After the event, a building- to-building survey was performed in L’Aquila downtown aiming to collect data in order to perform a strict evaluation of the damage. The survey was carried out under the European Macroseismic Scale (EMS98) to evaluate the local macroseismic intensity. This damage survey represents the most complex application of the EMS98 in Italy since it became effective. More than 1,700 buildings (99% of the building stock) were taken into account during the survey at L’Aquila downtown, highlighting the difficult application of the macroseismic scale in a large urban context. The EMS98 revealed itself to be the best tool to perform such kind of analysis in urban settings. The complete survey displayed evidence of peculiar features in the damage distribution. Results revealed that the highest rate of collapses occurred within a delimited area of the historical centre and along the SW border of the fluvial terrace on which the city is settled. Intensity assessed for L’Aquila downtown was 8–9 EMS.
    Description: Published
    Description: 67-80
    Description: 1.11. TTC - Osservazioni e monitoraggio macrosismico del territorio nazionale
    Description: JCR Journal
    Description: restricted
    Keywords: Macroseismic intensity ; EMS98 ; Damage survey ; L’Aquila ; 6 April 2009 earthquake ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 11
    Publication Date: 2017-04-04
    Description: Active volcanoes are thought to be important contributors to the atmospheric mercury (Hg) budget, and this chemical element is one of the most harmful atmospheric pollutants, owing to its high toxicity and long residence time in ecosystems. There is, however, considerable uncertainty over the magnitude of the global volcanic Hg flux, since the existing data on volcanogenic Hg emissions are sparse and often ambiguous. In an attempt to extend the currently limited dataset on volcanogenic Hg emissions, we summarize the results of Hg flux measurements at seven active open-conduit volcanoes; Stromboli, Asama, Miyakejima, Montserrat, Ambrym, Yasur, and Nyiragongo.. Data from the domebuilding Soufriere Hills volcano are also reported. Using our determined mercury to SO2 mass ratios in tandem with the simultaneously-determined SO2 emission rates, we estimate that the 7 volcanoes have Hg emission rates ranging from 0.2 to 18 t yr-1 (corresponding to a total Hg flux of ~41 t·yr-1). Based on our dataset and previous work, we propose that a Hg/SO2 plume ratio ~10-5 is bestrepresentative of gas emissions from quiescent degassing volcanoes. Using this ratio, we infer a global volcanic Hg flux from persistent degassing of ~95 t·yr-1
    Description: Published
    Description: 497-510
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: restricted
    Keywords: Volcanogenic mercury ; Mercury ; Volcanic plume ; Mercury flux ; Mercury inventories ; Atmospheric mercury ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 12
    Publication Date: 2017-04-04
    Description: During 2007–2008, three CO2 flux surveys were performed on El Chichón volcanic lake, Chiapas, Mexico, with an additional survey in April 2008 covering the entire crater floor (including the lake). The mean CO2 flux calculated by sequential Gaussian simulation from the lake was 1,190 (March 2007), 730 (December 2007) and 1,134 g m−2 day−1 (April 2008) with total emission rates of 164±9.5 (March 2007), 59±2.5 (December 2007) and 109±6.6 t day−1 (April 2008). The mean CO2 flux estimated from the entire crater floor area was 1,102 g m−2 day−1 for April 2008 with a total emission rate of 144±5.9 t day−1. Significant change in CO2 flux was not detected during the period of survey, and the mapping of the CO2 flux highlighted lineaments reflecting the main local and regional tectonic patterns. The 3He/4He ratio (as high as 8.1 RA) for gases in the El Chichón crater is generally higher than those observed at the neighbouring Transmexican Volcanic Belt and the Central American Volcanic Arc. The CO2/3He ratios for the high 3He/4He gases tend to have the MORB-like values (1.41×109), and the CO2/3He ratios for the lower 3He/4He gases fall within the range for the arc-type gases. The high 3He/4He ratios, the MORB-like CO2/3He ratios for the high 3He/4He gases and high proportion of MORB-CO2 (M=25 ±15%) at El Chichón indicate a greater depth for the generation of magma when compared to typical arc volcanoes.
    Description: Published
    Description: 423-441
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: reserved
    Keywords: El Chichon ; CO2 soil flux ; Crater Lake ; Gas geochemistry ; He-C isotopes ; Fumarolic and bubbling gases ; Tectonics ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 13
    Publication Date: 2020-02-24
    Description: A multidisciplinary geological and compositional investigation allowed us to reconstruct the occurrence of flank eruptions on the lower NE flank of Stromboli volcano since 15 ka. The oldest flank eruption recognised is Roisa, which occurred at ~15 ka during the Vancori period, and has transitional compositional characteristics between the Vancori and Neostromboli phases. Roisa was followed by the San Vincenzo eruption that took place at ~12 ka during the early stage of Neostromboli period. The eruptive fissure of San Vincenzo gave rise to a large scoria cone located below the village of Stromboli, and generated a lava flow, most of which lies below sea level. Most of the flank eruptions outside the barren Sciara del Fuoco occurred in a short time, between ~9 and 7 ka during the Neostromboli period, when six eruptive events produced scoria cones, spatter ramparts and lava flows. The Neostromboli products belong to a potassic series (KS), and cluster in two differently evolved groups. After an eruptive pause of ~5,000 years, the most recent flank eruption involving the NE sector of the island occurred during the Recent Stromboli period with the formation of the large, highly K calc-alkaline lava flow field, named San Bartolo. The trend of eruptive fissures since 15 ka ranges from N30°E to N55° E, and corresponds to the magma intrusions radiating from the main feeding system of the volcano.
    Description: The mapping of Stromboli was supported by a grant to S. Calvari (Project V2/01, 2005–2007, funded by the Istituto Nazionale di Geofisica e Vulcanologia and by the Italian Civil Protection). This work was partly supported by INGV through a research grant financed byMIUR-FIRB to G. Norini.We wish to thank the former Director of INGV-Sezione di Catania, A. Bonaccorso, for making additional funds available for field trip and datings.
    Description: Published
    Description: 101-112
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: JCR Journal
    Description: restricted
    Keywords: Stromboli ; flank fissures ; Stratigraphy ; Neostromboli ; Bulk rock composition ; eruptive fissures ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 14
    Publication Date: 2020-02-24
    Description: On 27 February 2007, a new eruption occurred on Stromboli which lasted until 2 April. It was characterized by effusive activity on the Sciara del Fuoco and by a paroxysmal event (15 March). This crisis represented an opportunity for us to refine the model that had been developed previously (2002-2003 eruption) and to improve our understanding of the relationship between the magmatic dynamics of the volcano and the geochemical variations in the fluids. In particular, the evaluation of the dynamic equilibrium between the volatiles (CO2 and SO2) released from the magma and the corresponding fluids discharged from the summit area allowed us to evaluate the level of criticality of the volcanic activity. One of the major accomplishments of this study is a four-year database of summit soil CO2 flux on the basis of which we define the thresholds (Low-Medium-High) for this parameter that are empirically based on the natural volcanological evolution of Stromboli. The SO2 fluxes of the degassing plume and the CO2 fluxes emitted from the soil at Pizzo Sopra la Fossa are also presented. Noteworthy geochemical signals of volcanic unrest have been clearly identified before, during, and after the effusive activity. These signals were found almost simultaneously in the degassing plume (SO2 flux) and in soil degassing (CO2 flux) at the summit, although the two degassing processes are shown to be clearly different. The interpretation of the results will be useful for future volcanic surveillance at Stromboli.
    Description: In press
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: reserved
    Keywords: Stromboli Volcano ; CO2 soil flux ; Geochemical monitoring ; 2007 eruption ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 15
    Publication Date: 2020-02-24
    Description: Recent laboratory experiments on Etna basalt have permitted the generation of an extensive catalogue of acoustic emissions (AE) during two key experimental phases. Firstly, AE have been generated during triaxial compressional tests and formation of a complex fracture/damage zone. Secondly, rapid fluid decompression through the damage/shear zone after failure. We report new results from an advanced analysis method using AE spectrograms, allowing us to qualitatively identify high and low frequency events; essentially comparable to seismicity in volcanic areas. Our analysis, for the first time, quantitatively classifies ‘families’ of AE events belonging to the same experimental stage without prior knowledge. We then test the method using the AE catalogue for verification, which is not possible with field data. FFT spectra, obtained from AE, are subdivided into equal log intervals for which a local slope is calculated. Factor analysis has been then applied, in which we use a data matrix of columns representing the variables considered (frequency data averaged in bins) vs. rows indicating each AE data set. Factor analysis shows that the method is very effective and suitable for reducing data complexity, allowing distinct factors to be obtained. We conclude that most of the data variance (information content) can be well represented by three factors only, each one representing a well defined frequency range. Through the factor scores it is possible to represent data in a lower dimension factor space. Classification is then possible by identifying clusters of AE belonging to the same experimental stage. This allows us to propose a deformation/decompression interpretation based solely on the AE frequency analysis and to identify a third type of AE related to fluid movements in the deformation stage.
    Description: Published
    Description: 201-211
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: open
    Keywords: acoustic emissions ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 05. General::05.01. Computational geophysics::05.01.04. Statistical analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 16
    Publication Date: 2017-04-04
    Description: Lake Ohrid is probably of Pliocene age, and the oldest extant lake in Europe. In this study climatic and environmental changes during the last glacial-interglacial cycle are reconstructed using lithological, sedimentological, geochemical and physical proxy analysis of a 15-m-long sediment succession from Lake Ohrid. A chronological framework is derived from tephrochronology and radiocarbon dating, which yields a basal age of ca. 136 ka. The succession is not continuous, however, with a hiatus between ca. 97.6 and 81.7 ka. Sediment accumulation in course of the last climatic cycle is controlled by the complex interaction of a variety of climate-controlled parameters and their impact on catchment dynamics, limnology, and hydrology of the lake. Warm interglacial and cold glacial climate conditions can be clearly distinguished from organic matter, calcite, clastic detritus and lithostratigraphic data. During interglacial periods, short-term fluctuations are recorded by abrupt variations in organic matter and calcite content, indicating climatically-induced changes in lake productivity and hydrology. During glacial periods, high variability in the contents of coarse silt to fine sand sized clastic matter is probably a function of climatically-induced changes in catchment dynamics and wind activity. In some instances tephra layers provide potential stratigraphic markers for short-lived climate perturbations. Given their widespread distribution in sites across the region, tephra analysis has the potential to provide insight into variation in the impact of climate and environmental change across the Mediterranean.
    Description: Published
    Description: 295-310
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: reserved
    Keywords: Lake Ohrid ; Mediterranean ; Tephrochronology ; Paleolimnology ; Last glacial-interglacial cycle ; 03. Hydrosphere::03.01. General::03.01.03. Global climate models ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 17
    Publication Date: 2017-04-04
    Description: This volume brings together the advanced research results obtained by the European COST Action 2102: “Cross Modal Analysis of Verbal and Nonverbal Communication.” The research published in this book was discussed at the Third EUCOGII-COST 2102 International Training School entitled “Toward Autonomous, Adaptive, and Context-Aware Multimodal Interfaces: Theoretical and Practical Issues,” held in Caserta, Italy, during March 15–19, 2010. The school was jointly sponsored by: a) COST (European Cooperation in Science and Technology, www.cost.eu) in the domain of Information and Communication Technologies (ICT) for disseminating the advances of the research activities developed within the COST Action 2102 (cost2102.cs.stir.ac.uk) b) EUCogII: 2nd European Network for the Advancement of Artificial Cognitive Systems, Interaction and Robotics (http://www.eucognition.org/).
    Description: Published
    Description: 5.9. Formazione e informazione
    Description: open
    Keywords: TOWARDS AUTONOMOUS ; ADAPTIVE ; 05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous ; 05. General::05.06. Methods::05.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 18
    Publication Date: 2017-04-04
    Description: This paper presents an analysis of seismicity associated with the volcanic activity of Volcàn de Colima (México) and recorded in the period November 2005–April 2006 during a field survey by the Istituto Nazionale di Geofisica e Vulcanologia (INGV)–Osservatorio Vesuviano, the Observatorio Vulcanologico de Colima of Colima University and the Instituto Andaluz de Geofisica, University of Granada. Three different types of volcanic earthquakes have been identified on the basis of their spectral properties: Type A (0.3–1 Hz), Type B (1–5 Hz) and Type C (3–4 Hz). Results of polarization analysis applied to Type A events show a predominance of radial motion, indicating that the wavefield comprises compressional waves (P) and shear waves polarized in the vertical plane (SV), while the signal always begins with a negative polarity. Type A, B and C earthquakes have been located using both a flat layered model and a 3D model including topography. Hypocentre distributions indicate that the source of Type A signals is very shallow and confined to a small volume lying about 1 km below the crater. In contrast, the source of Type B and C events is significantly deeper, with most hypocentres located in a volume of about 1 km3 centred at 2.5–3 km depth. A cluster analysis based on the crosscorrelation among the waveforms of different events recorded at the same station was applied to Type A earthquakes. Only two clusters, which include only a small percentage of events were found, indicating that earthquake families were uncommon during the period of our survey.
    Description: Published
    Description: 887-898
    Description: 3.1. Fisica dei terremoti
    Description: JCR Journal
    Description: reserved
    Keywords: Colima Volcano ; Long Period Events ; Earthquake location ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 19
    Publication Date: 2017-04-04
    Description: We describe analytical details and uncertainty evaluation of a simple technique for the measurement of the carbon isotopic composition of CO2 in volcanic plumes. Data collected at Solfatara and Vulcano, where plumes are fed by fumaroles which are accessible for direct sampling, were first used to validate the technique. For both volcanoes, the plume-derived carbon isotopic compositions are in good agreement with the fumarolic compositions, thus providing confidence on the method, and allowing its application at volcanoes where the volcanic component is inaccessible to direct sampling. As a notable example, we applied the same method to Mount Etna where we derived a δ13C of volcanic CO2 between −0.9±0.27‰ and −1.41± 0.27‰ (Bocca Nuova and Voragine craters). The comparison of our measurements to data reported in previous work values of Etna CO2 from~ −4‰, in the 1970’s and the 1980’s, to~ −1‰ at the present time (2009). This shift toward more positive δ13C values matches a concurrent change in magma composition and an increase in the eruption frequency and energy. We discuss such variations in terms of two possible processes: magma carbonate assimilation and carbon isotopic fractionation due to magma degassing along the Etna plumbing system. Finally, our results highlight potential of systematic measurements of the carbon isotopic composition of the CO2 emitted by volcanic plumes for a better understanding of volcanic processes and for improved surveillance of volcanic activity.
    Description: Published
    Description: 531-542
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: restricted
    Keywords: Volcanic plume ; Carbon isotope ; Etna ; Magmatic degassing ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 20
    Publication Date: 2017-04-04
    Description: Increased atmospheric carbon dioxide concentration provided warmer atmospheric temperature and higher atmospheric water vapor content, but not necessarily more precipitation. A set of experiments performed with a state-of-the-art coupled general circulation model forced with increased atmospheric CO2 concentration (2, 4 and 16 times the present-day mean value) were analyzed and compared with a control experiment to evaluate the effect of increased CO2 levels on monsoons. Generally, the monsoon precipitation responses to CO2 forcing are largest if extreme concentrations of carbon dioxide are used, but they are not necessarly proportional to the forcing applied. In fact, despite a common response in terms of an atmospheric water vapor increase to the atmospheric warming, two out of the six monsoons studied simulate less or equal summer mean precipitation in the 16xCO2 experiment compared to the intermediate sensitivity experiments. The precipitation differences between CO2 sensitivity experiments and CTRL have been investigated specifying the contribution of thermodynamic and purely dynamic processes. As a general rule, the differences depending on the atmospheric moisture content changes (thermodynamic component) are large and positive, and they tend to be damped by the dynamic component associated with the changes in the vertical velocity. However, differences are observed among monsoons in terms of the role played by other terms (like moisture advection and evaporation) in shaping the precipitation changes in warmer climates. The precipitation increase, even if weak, occurs despite a weakening of the mean circulation in the monsoon regions (‘‘precipitation-wind paradox’’). In particular, the tropical east-west Walker circulation is reduced, as found from velocity potential analysis. The meridional component of the monsoon circulation is changed as well, with larger (smaller) meridional (vertical) scales.
    Description: Published
    Description: 83-101
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: open
    Keywords: carbon dioxide forcing ; monsoon precipitation ; coupled GCMs ; 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate ; 01. Atmosphere::01.01. Atmosphere::01.01.04. Processes and Dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 21
    Publication Date: 2020-02-24
    Description: A significant part of Campania is extensively covered by volcaniclastic soils, deriving from the alteration of airfall-sedimented formations of layered ashes and pumices that were ejected by Campi Flegrei and Mt. Somma–Vesuvius during explosive eruptions. Where such soils cover steep slopes cut in carbonate bedrock, landforms depend essentially on the morpho-evolution of such slopes prior to the deposition of the volcaniclastic soils, because these are generally present only as thin veneers, up to a few meters of total thickness. Historical records and local literature testify that, in this part of Campania, landslides that originate on carbonate slopes covered by such soils and terminate at their foot or at gully outlets are frequent, following critical rainfall events. Such landslides can be classified as complex, occurring initially as debris slides, but rapidly evolving into debris avalanches and/or debris flows. The localization of the initial sliding areas (i.e. ‘‘sources’’) on the slopes depends on both the spatial distribution of characters of the soil cover and the spatial distribution of the triggering rainfall events. It therefore appears reasonable to separate the two aspects of the problem and focus on the former one, in order to attempt an assessment of soil sliding susceptibility in the event of landslide-triggering rainfall. In this paper, some results of the application of a method aimed at such an assessment are presented. The method, called SLIDE (from SLiding Initiation areas DEtection), is based on the concept that, for a spatially homogeneous soil cover and a spatially homogeneous landslide-triggering rainfall sequence, different values of threshold slope gradient for limit equilibrium conditions exist, depending on morphological characters of the soil cover, such as its continuity and planform curvature. The method is based on the assessment of (1) soil cover presence, (2) discontinuities within soil cover, (3) slope gradients and curvature, by means of good resolution DEMs. It has been applied to sample carbonate slopes of Campania, where landslides originated either repeatedly or recently. Results are encouraging, and a soil sliding susceptibility map of a large area, based on a simplified version of method, is also presented.
    Description: Published
    Description: 155-168
    Description: 5.5. TTC - Sistema Informativo Territoriale
    Description: JCR Journal
    Description: reserved
    Keywords: Debris-slide susceptibility ; Volcaniclastic soil cover ; Soil cover discontinuities ; Planform curvature ; 05. General::05.08. Risk::05.08.02. Hydrogeological risk
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  • 22
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    In:  EPIC3Polar Biology, Springer, 35(1), pp. 15-37, ISSN: 0722-4060
    Publication Date: 2019-07-16
    Description: A major aim of this review is to determine which physiological functions are adopted by adults and larvae to survive the winter season with low food supply and their relative importance. A second aim is to clarify the extent to which seasonal variation in larval and adult krill physiology is mediated by environmental factors with a strong seasonality, such as food supply or day light. Experimental studies on adult krill have demonstrated that speciWc physiological adaptations during autumn and winter, such as reduced metabolic rates and feeding activity, are not caused simply by the scarcity of food, as was previously assumed. These adaptations appear to be inXuenced by the local light regime. The physiological functions that larval krill adopt during winter (reduced metabolism, delayed development, lipid utilisation, and variable growth rates) are, in contrast to the adults, under direct control by the available food supply. During winter, the adults often seem to have little association with sea ice (at least until early spring). The larvae, however, feed within sea ice but mainly on the grazers of the ice algal community rather than on the algae themselves. In this respect, a miss-match in timing of the occurrence of the last phytoplankton blooms in autumn and the start of the sea ice formation, as has been increasingly observed in the west Antarctic Peninsula (WAP) region, will impact larval krill development during winter in terms of food supply and consequently the krill stock in this region.
    Repository Name: EPIC Alfred Wegener Institut
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  • 23
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    In:  EPIC3Earth System Modelling - Volume 2. Algorithms, Code Infrastructure and Optimisation Series: SpringerBriefs in Earth System Sciences, Earth System Modelling - Volume 2. Algorithms, Code, Infrastructure and Optimisation, Springer, Ed. R. Redler and R. Budich., Springer, pp. 25-34, ISBN: ISBN 978-3-642-23830
    Publication Date: 2014-04-15
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 24
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    In:  EPIC3Computational Science and High Performance Computing IV, Notes on Numerical Fluid Mechanics and Multidisciplinary Design. 2010., Berlin, Springer, 380 p., pp. 191-206, ISBN: 978-3-642-17769-9
    Publication Date: 2014-04-15
    Repository Name: EPIC Alfred Wegener Institut
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  • 25
    Publication Date: 2017-04-04
    Description: During its 1800-year-long persistent activity the Stromboli volcano has erupted a highly porphyritic (HP) volatile-poor scoriaceous magma and a low porphyritic (LP) volatile-rich pumiceous magma. The HP magma is erupted during normal Strombolian explosions and lava effusions, while the LP one is related to more energetic paroxysms. During the March–April 2003 explosive activity, Stromboli ejected two typologies of juvenile glassy ashes, namely highly vesicular LP shards and volatile-poor HP shards. Their textural and in situ chemical characteristics are used to unravel mutual relationships between HP and LP magmas, as well as magma dynamics within the shallow plumbing system. The mantle-normalized trace element patterns of both ash types show the typical arc-lava pattern; however, HP glasses possess incompatible element concentrations higher than LP glasses, along with Sr and Eu negative anomalies. HP shards are generally characterized by higher Li contents (to ~20 ppm) and lower δ7Li values (+1.2 to −3.8‰) with respect to LP shards (Li contents of 7–14 ppm and δ7Li ranging between +4.6 and +0.9‰). Fractional crystallization models based on major and trace element compositions, combined with a degassing model based on open-system Rayleigh distillation and on the assumption that melt/fluidDLi 〉 1, show that abundant (~30%) plagioclase precipitation and variable degrees of degassing can lead the more primitive LP magma to evolve toward a differentiated (isotopically lighter) HP magma ponding in the upper conduit and undergoing slow continuous degassing-induced crystallization. This study also evidences that in March 2003 Stromboli volcano poured out a small early volume of LP magma that traveled slower within the conduit with respect to later and larger volumes of fast ascending LP magma erupted during the April 5 paroxysm. The different ascent rates and cooling rates of the two LP magma batches (i.e., pre- and post-paroxysm) resulted in small, but detectable, differences in their chemical signatures. Finally, this study highlights the high potential of in situ investigations of juvenile glassy ashes in petrologic and geochemical monitoring the volcanic activity and of Li isotopes as tracers of degassing processes within the shallow plumbing system.
    Description: Published
    Description: 541-561
    Description: 1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: JCR Journal
    Description: reserved
    Keywords: Stromboli ; Volcanic ash ; Lithium isotopes ; Degassing-induced crystallization ; Petrologic monitoring ; 04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 26
    Publication Date: 2016-03-13
    Description: Seasonal dynamics in the activity of Arctic shelf benthos have been the subject of few local studies, and the pronounced among-site variability characterizing their results makes it difficult to upscale and generalize their conclusions. In a regional study encompassing five sites at 100–595 m water depth in the southeastern Beau- fort Sea, we found that total pigment concentrations in surficial sediments, used as proxies of general food supply to the benthos, rose significantly after the transition from ice-covered conditions in spring (March–June 2008) to open-water conditions in summer (June–August 2008), whereas sediment Chl a concentrations, typical markers of fresh food input, did not. Macrobenthic biomass (including agglutinated foraminifera [500 lm) varied significantly among sites (1.2–6.4 g C m-2 in spring, 1.1–12.6 g C m-2 in summer), whereas a general spring-to-summer increase was not detected. Benthic carbon remineralisation also ranged significantly among sites (11.9–33.2 mg C m-2 day-1 in spring, 11.6–44.4 mg C m-2 day-1 in summer) and did in addition exhibit a general significant increase from spring-to-summer. Multiple regression analysis suggests that in both spring and summer, sediment Chl a concentration is the prime determinant of benthic carbon remineralisation, but other factors have a significant secondary influence, such as foraminiferan biomass (negative in both seasons), water depth (in spring) and infaunal biomass (in summer). Our findings indicate the importance of the combined and dynamic effects of food supply and benthic community patterns on the carbon remineralisation of the polar shelf benthos in seasonally ice-covered seas.
    Repository Name: EPIC Alfred Wegener Institut
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  • 27
    Publication Date: 2022-05-25
    Description: This paper is not subject to U.S. copyright. The definitive version was published in Geo-Marine Letters 31 (2011): 237-248, doi:10.1007/s00367-011-0228-0.
    Description: Mechanisms and timescales responsible for pockmark formation and maintenance remain uncertain, especially in areas lacking extensive thermogenic fluid deposits (e.g., previously glaciated estuaries). This study characterizes seafloor activity in the Belfast Bay, Maine nearshore pockmark field using (1) three swath bathymetry datasets collected between 1999 and 2008, complemented by analyses of shallow box-core samples for radionuclide activity and undrained shear strength, and (2) historical bathymetric data (report and smooth sheets from 1872, 1947, 1948). In addition, because repeat swath bathymetry surveys are an emerging data source, we present a selected literature review of recent studies using such datasets for seafloor change analysis. This study is the first to apply the method to a pockmark field, and characterizes macro-scale (〉5 m) evolution of tens of square kilometers of highly irregular seafloor. Presence/absence analysis yielded no change in pockmark frequency or distribution over a 9-year period (1999–2008). In that time pockmarks did not detectably enlarge, truncate, elongate, or combine. Historical data indicate that pockmark chains already existed in the 19th century. Despite the lack of macroscopic changes in the field, near-bed undrained shear-strength values of less than 7 kPa and scattered downcore 137Cs signatures indicate a highly disturbed setting. Integrating these findings with independent geophysical and geochemical observations made in the pockmark field, it can be concluded that (1) large-scale sediment resuspension and dispersion related to pockmark formation and failure do not occur frequently within this field, and (2) pockmarks can persevere in a dynamic estuarine setting that exhibits minimal modern fluid venting. Although pockmarks are conventionally thought to be long-lived features maintained by a combination of fluid venting and minimal sediment accumulation, this suggests that other mechanisms may be equally active in maintaining such irregular seafloor morphology. One such mechanism could be upwelling within pockmarks induced by near-bed currents.
    Description: Graduate support for Brothers came from a Maine Economic Improvement Fund Dissertation Fellowship.
    Repository Name: Woods Hole Open Access Server
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  • 28
    Publication Date: 2022-05-25
    Description: © The Author(s), 2011. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Chinese Science Bulletin 56 (2011): 2828-2838, doi:10.1007/s11434-011-4619-4.
    Description: During January–May in 2007, the Chinese research cruise DY115-19 discovered an active hydrothermal field at 49°39′E/37°47′S on the ultraslow spreading Southwest Indian Ridge (SWIR). This was also the first active hydrothermal field found along an ultraslow-spreading ridge. We analyzed mineralogical, textural and geochemical compositions of the sulfide chimneys obtained from the 49°39′E field. Chimney samples show a concentric mineral zone around the fluid channel. The mineral assemblages of the interiors consist mainly of chalcopyrite, with pyrite and sphalerite as minor constitunets. In the intermediate portion, pyrite becomes the dominant mineral, with chalcopyrite and sphalerite as minor constitunets. For the outer wall, the majority of minerals are pyrite and sphalerite, with few chalcopyrite. Towards the outer margin of the chimney wall, the mineral grains become small and irregular in shape gradually, while minerals within interstices are abundant. These features are similar to those chimney edifices found on the East Pacific Rise and Mid-Atlantic Ridge. The average contents of Cu, Fe and Zn in our chimney samples were 2.83 wt%, 45.6 wt% and 3.28 wt%, respectively. The average Au and Ag contents were up to 2.0 ppm and 70.2 ppm respectively, higher than the massive sulfides from most hydrothermal fields along mid-ocean ridge. The rare earth elements geochemistry of the sulfide chimneys show a pattern distinctive from the sulfides recovered from typical hydrothermal fields along sediment-starved mid-ocean ridge, with the enrichment of light rare earth elements but the weak, mostly negative, Eu anomaly. This is attributed to the distinct mineralization environment or fluid compositions in this area.
    Description: This work was supported by the China Ocean Mineral Resources Research and Development Association Program (DY115- 02-1-01) and the State Oceanic Administration Youth Science Fund (2010318).
    Keywords: Sulfide chimneys ; 49°39′E hydrothermal field ; Southwest Indian Ridge ; Mid-ocean ridge ; DY115-19 Chinese cruise
    Repository Name: Woods Hole Open Access Server
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  • 29
    Publication Date: 2022-05-25
    Description: © The Author(s), 2011. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License. The definitive version was published in Biological Invasions 13 (2011): 2513-2531, doi:10.1007/s10530-011-0078-8.
    Description: The spiny water flea (Bythotrephes longimanus) is spreading from Great Lakes coastal waters into northern inland lakes within a northern temperature-defined latitudinal band. Colonization of Great Lakes coastal embayments is assisted by winds and seiche surges, yet rapid inland expansion across the northern states comes through an overland process. The lack of invasions at Isle Royale National Park contrasts with rapid expansion on the nearby Keweenaw Peninsula. Both regions have comparable geology, lake density, and fauna, but differ in recreational fishing boat access, visitation, and containment measures. Tail spines protect Bythotrephes against young of the year, but not larger fish, yet the unusual thick-shelled diapausing eggs can pass through fish guts in viable condition. Sediment traps illustrate how fish spread diapausing eggs across lakes in fecal pellets. Trillions of diapausing eggs are produced per year in Lake Michigan and billions per year in Lake Michigamme, a large inland lake. Dispersal by recreational fishing is linked to use of baitfish, diapausing eggs defecated into live wells and bait buckets, and Bythothephes snagged on fishing line, anchor ropes, and minnow seines. Relatively simple measures, such as on-site rinsing of live wells, restricting transfer of certain baitfish species, or holding baitfish for 24 h (defecation period), should greatly reduce dispersal.
    Description: Study of Lakes Superior and Michigan was funded from NSF OCE-9726680 and OCE-9712872 to W.C.K., OCE-9712889 to J. Churchill. Geographic survey sampling and Park studies in the national parks during 2008-2010 were funded by a grant from the National Park Service Natural Resource Preservation Program GLNF CESU Task Agreement No. J6067080012.
    Keywords: Spiny cladoceran ; Dispersal ; Temperature ; Diapausing eggs ; YOY fish
    Repository Name: Woods Hole Open Access Server
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  • 30
    Publication Date: 2017-04-04
    Description: Destructive volcaniclastic flows are among the most recurrent and dangerous natural phenomena in volcanic areas. They can originate not only during or shortly after an eruption (syn-eruptive) but also during a period of volcanic quiescence (inter-eruptive), when heavy and/or persistent rains remobilize loose pyroclastic deposits. The area in Italy most prone to such flows is that of the Apennine Mountains bordering the southern Campania Plain. These steep slopes are covered by pyroclastic material of variable thickness (a few cm to several m) derived from the explosive activity of the Somma-Vesuvius and Campi Flegrei volcanoes a few tens of kilometers to the west. The largest and most recent devastating event occurred on May 5, 1998, causing the death of more than 150 people and considerable damage to villages at the foot of the Apennine Mountains. This tragic event was only the most recent of a number of volcaniclastic flows affecting the area in both historical and prehistoric times. Historical accounts report that more than 500 events have occurred in the last five centuries and that more than half of these occurred in the last 100 years, causing hundreds of deaths. In order to improve volcaniclastic flow hazard zonation and risk mitigation in the study area, we produced a zonation map that identifies the drainage basins potentially prone to disruption. This map was obtained by combining morphological characteristics (concavity and basin shape factor) and the mean slope distribution of drainage basins derived from a digital elevation model with a 10-m resolution. These parameters allowed for the classification of 1,069 drainage basins, which have been grouped into four different classes of proneness to disruption: low, moderate, high and very high. The map compiled in a GIS environment, as well as the linked database, can be rapidly queried.
    Description: Published
    Description: 371-387
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 4.3. TTC - Scenari di pericolosità vulcanica
    Description: JCR Journal
    Description: reserved
    Keywords: Volcaniclastic flow hazard ; GIS ; Vesuvian area ; Southern Campania Plain ; Slope instability ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
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  • 31
    Publication Date: 2017-04-04
    Description: We describe analytical details and uncertainty evaluation of a simple technique for the measurement of the carbon isotopic composition of CO2 in volcanic plumes. Data collected at Solfatara and Vulcano, where plumes are fed by fumaroles which are accessible for direct sampling, were first used to validate the technique. For both volcanoes, the plume-derived carbon isotopic compositions are in good agreement with the fumarolic compositions, thus providing confidence on the method, and allowing its application at volcanoes where the volcanic component is inaccessible to direct sampling. As a notable example, we applied the same method to Mount Etna where we derived a δ13C of volcanic CO2 between −0.9 ± 0.27‰ and −1.41 ± 0.27‰ (Bocca Nuova and Voragine craters). The comparison of our measurements to data reported in previous work highlights a temporal trend of systematic increase of δ13C values of Etna CO2 from ~ −4‰, in the 1970’s and the 1980’s, to ~ −1‰ at the present time (2009). This shift toward more positive δ13C values matches a concurrent change in magma composition and an increase in the eruption frequency and energy. We discuss such variations in terms of two possible processes: magma carbonate assimilation and carbon isotopic fractionation due to magma degassing along the Etna plumbing system. Finally, our results highlight potential of systematic measurements of the carbon isotopic composition of the CO2 emitted by volcanic plumes for a better understanding of volcanic processes and for improved surveillance of volcanic activity.
    Description: In press
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: 2.4. TTC - Laboratori di geochimica dei fluidi
    Description: JCR Journal
    Description: reserved
    Keywords: Volcanic plume ; Carbon isotope ; Etna ; Magmatic degassing ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
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  • 32
    Publication Date: 2017-04-04
    Description: The development of the new Italian strong-motion database ITACA (ITalian AC-celerometric Archive, http://itaca.mi.ingv.it) is in progress under the sponsorship of the National Department of Civil Protection (DPC) within Project S4, in the framework of DPC-INGV 2007–2009 research agreement. This work started from the alpha version of ITACA [8], where 2,182 3-component records from 1,004 earthquakes, mainly recorded by the National Accelerometric Network, RAN, operated by DPC, were processed and included in the database. Earthquake metadata, recording station information and reports on the available geologicalgeophysical information of 452 recording sites, corresponding to about 70% of the total, were also included. Subsequently, ITACA has been updated and will reach its final stage by the end of Project S4, around mid-2010, with additional features, improved information about recording stations, and updated records, including the Mw6.3 L’Aquila earthquake. All records were re-processed with respect to the alpha version [9], with a special care to preserve information about late-triggered events and to ensure compatibility of corrected records, i.e., velocity and displacement traces obtained by the first and second integral of the corrected acceleration should not be affected by unrealistic trends. After a short introduction of ITACA and its most relevant features and statistics, this paper mainly deals with the newly adopted processing scheme, with reference to the problems encountered and the solutions that have been devised.
    Description: Published
    Description: 99-114
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: open
    Keywords: strong motion data ; Itaca database ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 33
    Publication Date: 2017-04-04
    Description: Italy is a country characterized by high seismic hazard so strong-motion monitoring represents a relevant issue. Several strong-motion networks have been installed in the Italian territory during the last decades, with the aim of recording the ground motion generated by moderate to strong events or to monitor single regions. The collection of the strong-motion recordings of the Italian earthquakes was recently fulfilled and data are distributed through the ITACA database (http://itaca.mi.ingv.it). The new data set was used to develop a set of ground motion prediction equations (hereinafter GMPEs) for the Italian territory (Bindi et al., 2009), in order to update the well known GMPEs developed by Sabetta and Pugliese. The recent Mw 6.3 earthquake that occurred in central Italy on April 2009 and the upgrades of the ITACA database gave us the possibility to validate the predictive capability of the newly developed GMPEs and to explore the regional variability inside the Italian territory.
    Description: Published
    Description: 53-70
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: reserved
    Keywords: strong motion data ; Prediction equation ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 34
    Publication Date: 2017-04-04
    Description: In this paper, in an attempt to reveal possible changes connected to natural or anthropogenic causes, the main results of hydrogeochemical monitoring carried out at Mount Etna are evaluated. We report on the salinity contents of the groundwaters that flow in fractured volcanics, which make up the flanks of the volcano. These waters, analyzed for major ion chemistry, were sampled regularly from 1994 to 2004. Basing on nonparametric Sen’s slope estimator, time series of groundwater composition reveal that the salinity of most of the Etnean aquifers increased by 0.5% to 3.5% each year during this period. This change in the water chemistry is clearly referable to the overexploitation of the aquifers. This increasing trend needs to be inverted urgently; otherwise, it will cause a shortage of water in the near future, because the maximum admissible concentration of salinity for drinking water will be exceeded.
    Description: Published
    Description: 431-446
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: JCR Journal
    Description: restricted
    Keywords: Hydrochemistry ; Salinization ; Over-abstraction ; Groundwater monitoring ; 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics ; 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring ; 03. Hydrosphere::03.02. Hydrology::03.02.06. Water resources ; 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 35
    Publication Date: 2017-04-04
    Description: The Mw 5.7 earthquake that occurred on 12 May 1802 is the only one with Mw ≥ 5.5 located west of Lake Garda in the central-northern part of the Po Plain, Northern Italy, and the strongest event located in the seismic zone 907 of the ZS9 seismogenic zonation of Italy. Current parametric earthquake catalogs locate the event not far from important cities (e.g., Milan) and to sites where nuclear power plants were to be built in the 1980s or could be built in a near future. Although the earthquake parameters seemed sufficiently well constrained, a detailed investigation of documentary sources was performed, in repositories storing the documents of the Napoleonic departments to which the area affected by the earthquake belonged at that time. In the surviving archival series, we found the officers’ correspondence on all the administrative aspects raised by the earthquake. The newly collected records allowed the authors to significantly increase the number of macroseismic intensity data, including new observations in the most damaged area. The results have been then interpreted in terms of both Mercalli–Cancani–Sieberg and EMS98 macroseismic scales. The earthquake parameters were derived applying two different methods in order to get two independent estimates. Earthquake location is confirmed, although the still scarce data available in the area to the east of the epicenter do not permit to reduce the uncertainty to a minimum. According to the Boxer method, the magnitude is now slightly higher, and the source model shows a good agreement with the tectonic setting of the area.
    Description: Published
    Description: 629-651
    Description: 3.10. Storia ed archeologia applicate alle Scienze della Terra
    Description: JCR Journal
    Description: reserved
    Keywords: 1802 earthquake ; Northern Italy ; Historical seismology ; Macroseismic intensity ; Earthquake parameters ; 04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 36
    Publication Date: 2017-04-04
    Description: On 30 December 2002, a 25-30 × 106 m3 landslide on the NW flank of Stromboli volcano produced a tsunami that caused relevant damage to the Stromboli village and to the neighboring islands of the Aeolian archipelago. The NW flank of Stromboli has been the site of several, cubic kilometer-scale, landslides during the past 13 ka. In this paper we present sedimentological and compositional data of deep-sea cores recovered from a site located about 24 km north of the island. Our preliminary results indicate that: (i) turbidity currents were effectively generated by the large-scale failures and (ii) volcanogenic turbidity current deposits retain clues of the landslide source and slope failure dynamics. By analogy with Hawaii and the Canary islands we confirm that deep-sea sediments can be effectively used to assess the age and scale of past landslide events giving an important contribution to the tsunami hazard assessment of this region.
    Description: Published
    Description: 719-731
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 4.3. TTC - Scenari di pericolosità vulcanica
    Description: reserved
    Keywords: Landslide ; turbidite ; tsunami ; Stromboli ; 04. Solid Earth::04.04. Geology::04.04.04. Marine geology ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 37
    Publication Date: 2017-04-04
    Description: Large variations of the CO2 flux through the soil were observed between November 2002 and January 2006 at Mt. Etna volcano. In many cases, the CO2 flux was strongly influenced by changes in air temperature and atmospheric pressure. A new filtering method was then developed to remove the atmospheric influences on soil CO2 flux and, at the same time, to highlight the variations strictly related to volcanic activity. Successively, the CO2 corrected data were quantitatively compared with the spectral amplitude of the volcanic tremor by cross correlation function, cross-wavelet spectrum and wavelet coherence. These analyses suggested that the soil CO2 flux variations preceded those of volcanic tremor by about 50 days. Given that volcanic tremor is linked to the shallow (a few kilometer) magma dynamics and soil CO2 flux related to the deeper (*12 km b.s.l.) magma dynamics, the ‘‘delayed similarity’’ between the CO2 flux and the volcanic tremor amplitude was used to assess the average speed in the magma uprising into the crust, as about 170–260 mper day. Finally, the large amount of CO2 released before the onset of the 2004–2005 eruption indicated a deep ingression of new magma, which might have triggered such an eruption.
    Description: Published
    Description: 477–489
    Description: 3.6. Fisica del vulcanismo
    Description: JCR Journal
    Description: reserved
    Keywords: Mt. Etna volcano ; volcanic tremor ; soil CO2 ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 38
    Publication Date: 2017-04-04
    Description: The AND-2A drillcore (Antarctic Drilling Program—ANDRILL) was successfully completed in late 2007 on the Antarctic continental margin (Southern McMurdo Sound, Ross Sea) with the aim of tracking ice proximal to shallow marine environmental fluctuations and to document the 20-Ma evolution of the Erebus Volcanic Province. Lava clasts and tephra layers from the AND-2A drillcore were investigated from a petrographic and stratigraphic point of view and analyzed by the 40Ar–39Ar laser technique in order to constrain the age model of the core and to gain information on the style and nature of sediment deposition in the Victoria Land Basin since Early Miocene. Ten out of 17 samples yielded statistically robust 40Ar–39Ar ages, indicating that the AND-2A drillcore recovered ≤230 m of Middle Miocene (∼128–358 m below sea floor, ∼11.5–16.0 Ma) and 〉780 m of Early Miocene (∼358–1093 m below sea floor, ∼16.0–20.1 Ma). Results also highlight a nearly continuous stratigraphic record from at least 358 m below sea floor down hole, characterized by a mean sedimentation rate of ∼19 cm/ka, possible oscillations of no more than a few hundreds of ka and a break within ∼17.5–18.1 Ma. Comparison with available data from volcanic deposits on land, suggests that volcanic rocks within the AND-2A core were supplied from the south, possibly with source areas closer to the drill site for the upper core levels, and from 358 m below sea floor down hole, with the “proto-Mount Morning” as the main source.
    Description: Published
    Description: 487-505
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: JCR Journal
    Description: reserved
    Keywords: ANDRILL SMS ; 40Ar–39Ar geochronology ; Erebus volcanic province ; McMurdo Sound ; Lava clasts ; Sedimentation rate ; Tephra layers ; Victoria Land Basin ; 04. Solid Earth::04.04. Geology::04.04.02. Geochronology ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 39
    Publication Date: 2017-04-04
    Description: Recent stratigraphic studies at Vesuvius have revealed that, during the past 4,000 years, long lasting,moderate to low-intensity eruptions, associated with continuous or pulsating ash emission, have repeatedly occurred. The present work focuses on the AS1a eruption, the first of a series of ash-dominated explosive episodes which characterized the period between the two Subplinian eruptions of 472 AD and 1631 AD. The deposits of this eruption consist of an alternation of massive and thinly laminated ash layers and minor well sorted lapilli beds, reflecting the pulsatory injection into the atmosphere of variably concentrated ash-plumes alternating with Violent Strombolian stages. Despite its nearly constant chemical composition, the juvenile material shows variable external clast morphologies and groundmass textures, reflecting the fragmentation of a magma body with lateral and/or vertical gradients in both vesicularity and crystal content. Glass compositions and mineralogical assemblages indicate that the eruption was fed by rather homogeneous phonotephritic magma batches rising from a reservoir located at ~ 4 km (100 MPa) depth, with fluctuations between magma delivery and magma discharge. Using crystal size distribution (CSD) analyses of plagioclase and leucite microlites, we estimate that the transit time of the magma in the conduit was on the order of ~ 2 days, corresponding to an ascent rate of around 2× 10−2 ms−1. Accordingly, assuming a typical conduit diameter for this type of eruption, the minimum duration of the AS1a event is between about 1.5 and 6 years. Magma fragmentation occurred in an inertially driven regime that, in a magma with low viscosity and surface tension, can act also under conditions of slow ascent.
    Description: In press
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: JCR Journal
    Description: reserved
    Keywords: Ash emission activity ; Tephrite ; Vesuvius ; Stratigraphy ; Textural analyses ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 40
    Publication Date: 2017-04-04
    Description: Etna’s 2001 basaltic lava flow provided a good example of the distal flow segment between the flow front and stable channel, across which the flow evolves from channel-contained to dispersed. This zone was mapped with meter precision using LIDAR data collected during 2004 and 2005. These data, supported by field mapping, show that the flow front comprised eight lobes each 10 to 20 m high. The flow front appears to have advanced not as a single unit, but as a series of lobes moving forward one lobe at a time. Primary lobes were centered on the channel axis and marginal lobes were off-axis. The lobes advanced as breakouts of low-yield-strength lava from the flow core of the stalled flow front. Marginal lobes were abandoned and contributed to marginal levees flanking the transitional channel. For Etna’s 2001 flow, the transitional channel is 140 m wide, 700 m long and fed a 240-m-long zone of dispersed flow; the change from stable to transitional channel occurred at a major reduction in slope. Above this, the stable channel is 5.2 km long, 55 to 105 m wide and bounded by 15- to 25-m-high levees, and the stable channel is located over a previous channel. In a final stage of activity, lava ponding at the break-in-slope that marks the terminus of the stable channel put pressure on the eastern levee, causing it to fail. Liberated lava then fed a final break-out to the east. Similar flow front-features occur at other volcanoes, indicating that similar processes are characteristic of dispersed flow zones.
    Description: Published
    Description: 119-127
    Description: 1.10. TTC - Telerilevamento
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 3.6. Fisica del vulcanismo
    Description: JCR Journal
    Description: reserved
    Keywords: Basalt lava ; Channelised lava flow ; Flow front ; Zone of dispersed flow ; Flow dynamics ; LIDAR ; Etna ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 41
    Publication Date: 2017-04-04
    Description: In this work we present and discuss the results of ambient seismic noise analyses computed at four sites where seismic stations, managed by the INGV (Italian Institute for Geophysics and Vulcanology) and the DPC (Italian Department of Civil Protection), are installed inside buildings. The experiments were performed considering different types of installation: sensor located at the bottom of a school, directly installed on rock (case 1); sensor located at the bottom of a medieval fortress, built on an isolate hill, directly installed on rock (case 2); sensor installed on the foundations of a medieval fortress, built on an isolate hill (case 3); sensor installed on the foundations of a school, built on alluvial deposits (case 4). Since recent works proposed the use of spectral ratio techniques to study the dynamic characterization of buildings, ambient seismic-noise measurements were performed for each site close to the stations (at the base of the structures), at the top of the structures and outside the buildings. In order to check the source of vibrations both horizontal to vertical spectral ratio (HVNR) and standard spectral ratio (SSR) techniques were applied. For all stations the results from ambient seismic noise were compared to those obtained from earthquakes (HVSR). In order to detect preferential directions of amplification, for each site average HVNRs and HVSRs were computed considering one azimuth for each set of 5°. We obtain different results for different types of installation: in cases 1 and 2, where the sensors are directly installed on rock, the vibrations of the structure do not affect the noise measures performed close to the stations, which show flat HVNR in the whole frequency range: in both cases the eigenfrequency of the building is given by the HVNR calculated from the measures performed at the top of the structure. In cases 3 and 4, where the sensors are installed on the foundations of the considered structures, both the amplification peaks between 5 and 9 Hz (case 3) and between 5.5 and 7 Hz (case 4) include the contribution of the free oscillations of the buildings. In particular, in case 4, HVNRs performed outside building highlight possible soil–structure resonance effects in case of an earthquake.
    Description: Published
    Description: 723-738
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: JCR Journal
    Description: open
    Keywords: site effect ; soil-structure interaction ; spectral ratio techniques ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 42
    Publication Date: 2017-04-04
    Description: The necessity of a dense network in Northern Italy started from the lack of available data after the occurrence of the 24th November 2004, Ml 5.2, Salò earthquake. Since 2006, many efforts have been made by the INGV (Italian National Institute for Geophysic and Vulcanology), Department of Milano-Pavia (hereinafter INGV MI-PV), to improve the strong-motion monitoring of the Northern Italy regions. This activity led to the installation of a strong-motion network composed by 20 accelerometers, 4 coupled with 20-bits Lennartz Mars88 recorders, 12 coupled with 24-bits Reftek 130 recorders and 4 coupled with 24-bits Gaia2 recorders. The network allow us to reduce, in the area under study, the average inter-distances between strong-motion stations from about 40 km (at November 2004) to 15 km. At present the network includes nine 6-channels stations where velocity sensors work together the strong-motion ones. The data transmission is assured by modem-gsm, with the exception of four stations that send data in real time through a TCP/IP protocol. In order to evaluate different site responses, the stations have been installed both in free field and near (or inside) public buildings, located in the center of small villages. From June 2006 to December 2008 a dataset of 94 events with local magnitude range from 0.7 to 5.1 has been collected. An ad hoc data-processing system have been created in order to provide, after each recorded event, engineering parameters such as peak ground acceleration (PGA) and velocity (PGV), response spectra (SA and PSV), Arias and Housner intensities. Data dissemination is achieved through the web site http://rais.mi.ingv.it, while the waveforms are distributed through the Italian strong motion database (http://itaca.mi.ingv.it).
    Description: Published
    Description: 1091-1104
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: open
    Keywords: North Italy ; Strong motion station ; Data acquisition system ; Seismic networks ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
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  • 43
    Publication Date: 2017-04-04
    Description: The definition of the aftershocks sequence is still a debated topic. We here propose a study of the spatial and temporal variation of the earthquakes clustering and rate decay. We used five different seismic catalogues, characterized by specific spatial and magnitude ranges. They are respectively: world one, for a global analysis, Greek, Japanese, Californian and Italian regional catalogues in order to investigate different seismo-tectonic settings. A stacking procedure has been applied to characterize a typical sequence behavior and allowing the evaluation of changes over time intervals (
    Description: Published
    Description: 323-337
    Description: 3.1. Fisica dei terremoti
    Description: open
    Keywords: seismicity ; fractal dimension ; 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability ; 05. General::05.01. Computational geophysics::05.01.04. Statistical analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 44
    facet.materialart.
    Unknown
    Springer
    Publication Date: 2017-04-04
    Description: A repeat station is a site whose position is AQ1 accurately known and where accurate measurements of the geomagnetic field vector are made at regular intervals in order to provide information about the secular variation of the geomagnetic field. In this chapter we begin by giving a brief history of the development of repeat station networks. We then describe the instruments used to make measurements at a repeat station. These include fixing the position of the station, finding the direction of true north and measuring the components of the geomagnetic field. Emphasis is given to techniques and instruments that are in current use. We next discuss the procedures that are used to reduce the measurements to a usable form and consider the uses to which the reduced data are put. Finally, we discuss the continued importance of such data in the present era of satellite geomagnetic surveys.
    Description: Submitted
    Description: In press
    Description: 1.6. Osservazioni di geomagnetismo
    Description: restricted
    Keywords: Geomagnetic field ; Repeat Stations ; Geomagnetic measurements ; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 45
    Publication Date: 2017-04-04
    Description: Using the characteristic earthquake model, we calculate the probability of occurrence of earthquakes Mw 〉 5.5 for individual fault sources in the Central Apennines for the 30-year period (2007–2037). We show the effect of timedependent and time-independent occurrence (Brownian passage time (BPT) and Poisson) models together with uncertain slip rates and uncertain maximum magnitudes and, hence, uncertain recurrence times. In order to reduce the large prior geological slip rate uncertainty distribution for most faults, we obtain a posterior slip rate uncertainty distribution using a likelihood function obtained from regional historical seismicity. We assess the uncertainty of maximum magnitude by assuming that the uncertainty in fault width and length are described by a normal distribution with standard deviation equal to ±20% of the mean values. We then estimate the uncertainties of the 30-year probability of occurrence of a characteristic event using a Monte Carlo procedure. Uncertainty on each parameter is represented by the 16th and the 84th percentiles of simulated values. These percentiles bound the range that has a 68% probability of including the real value of the parameter. We do these both for the Poisson case and for the BPT case by varying the aperiodicity parameter (α value) using the values 0.3, 0.5, and 0.7. The Bayesian posterior slip rate uncertainties typically differ by a factor of about 2 from the 16th to the 84th percentile. Occurrence probabilities for the next 30 years at the 84th percentile typically range from 1% to 2% for faults where the Poisson model dominates and from 2% to 21% where one of the BPT models dominates. The uncertainty in occurrence probability under the time-dependent hypothesis is very large, when measured by the ratio of the 84th to the 16th percentile, frequently being as much as two orders of magnitude. On the other hand, when measured by standard deviation, these standard deviations range from 2% to 6% for those faults whose elapsed time since previous event is large, but always 2% or less for faults with relatively recent previous occurrence, because the probability of occurrence is always small.
    Description: Published
    Description: 95-117
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: PROBABILITY OF OCCURENCES ; TIME-DEPENDENT ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
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  • 46
    Publication Date: 2017-04-04
    Description: A temporary network of 33 seismic stations was deployed in the area struck by the 6th April 2009, Mw 6.3, L’Aquila earthquake (central Italy), with the aim to investigate the site amplification within the Aterno river Valley. The seismograms of 18 earthquakes recorded by 14 of the 33 stations were used to evaluate the average horizontal to vertical spectral ratio (HVSR) for each site and the standard horizontal spectral ratio (SSR) between a site and a reference station. The obtained results have been compared to the geological and geophysical information in order to explain the resonance frequencies and the amplification levels with respect to surface geology of the valley. The result indicate that there is no uniform pattern of amplification, due to the complex geologic setting, as the thickness and degree of cementation of the deposits is highly variable. As consequence, a large number of the local site response is observed, therefore it is very difficult to elaborate a unique model that can explain such a variability of the amplification.
    Description: Published
    Description: 697-715
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: JCR Journal
    Description: partially_open
    Keywords: l'Aquila earthquake ; microzoning ; ground shaking ; site effects ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
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  • 47
    Publication Date: 2017-04-04
    Description: Changes of the susceptibility to lava flow invasion at Mount Etna are quantified by using lava flow simulations on four Digital Elevation Models documenting the morphostructural modifications of the volcano in the time interval 1986–2007. The probabilistic code DOWNFLOW is used to derive the areas invaded by several thousands of lava flows obtaining, for each DEM, maps of the susceptibility to lava flow invasion and of the lava flow hazard. These maps show, for the first time, the evolution of these surficial properties with time, and render a quantitative image of the effects of topographic changes on the preferential lava flow drainage paths. The results illustrate how the emplacement of new lava flows and the growth of scoria cones affect the probability of inundation by lava flows. We conclude that the persistent activity of this volcano requires a frequent updating of the topography for a reliable lava flow hazard assessment.
    Description: Published
    Description: 537-546
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 4.3. TTC - Scenari di pericolosità vulcanica
    Description: JCR Journal
    Description: reserved
    Keywords: Lava flow simulation ; Digital Elevation Model ; Lidar ; Time series ; Lava flow hazard maps ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk ; 05. General::05.08. Risk::05.08.99. General or miscellaneous
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  • 48
    Publication Date: 2017-04-04
    Description: Strong ground-shaking mapping soon after a moderate-to-large earthquake is crucial to recognize the areas that have suffered the largest damage and losses. These maps have a fundamental role for emergency services, loss estimation and planning of emergency actions by the Civil Protection Authorities. This is particularly important for areas with high seismic risk levels, such as the Campania-Lucania Region in southern Italy. Taking advantage of the Irpinia Seismic Network (ISNet), a recently installed dense and wide dynamic seismic network, we have developed a procedure for rapid estimation of ground-shaking maps after moderate-to-large earthquakes (GRSmap). This uses an optimal data gridding scheme designed to account for bi-dimensional features of strong groundmotion fields, such as directivity, radiation patterns and focal mechanisms, to which most damage can be correlated. The basis of the mapping technique is a triangulation procedure to locally correct predicted data at the triangle barycentres where their vertices correspond to seismic stations. The method has been tested off-line using a simulated M 6.6 earthquake located at the centre of ISNet and applied to data of the 23 November 1980 Irpina M 6.9 earthquake recorded by a sparse network. This has highlighted its ability to predict peak ground-motion parameters of large magnitude earthquakes with respect to the attenuation relationships.
    Description: Published
    Description: 97–115
    Description: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: Ground-shaking maps ; Triangulation scheme ; Seismic source ; Seismic hazard ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
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  • 49
    facet.materialart.
    Unknown
    Springer
    In:  EPIC3Biodiversity Hotspots, Book, Berlin, Springer, pp. 503-526
    Publication Date: 2014-04-15
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 50
    Publication Date: 2022-05-24
    Description: The April 6, 2009 L’Aquila earthquake was responsible for an “anomalous”, relatively high degree of damage (i.e. Is 7 MCS scale) at Castelvecchio Subequo (CS). Indeed, the village is located at source-to-site distance of about 40 km, and it is surrounded by other inhabited centres to which considerably lower intensities, i.e. Is 5-6, have been attributed. Moreover, the damage was irregularly distributed within CS, being mainly concentrated in the uppermost portion of the old village. Geophysical investigations (ambient seismic noise and weak ground motions analyses) revealed that site effects occurred at CS. Amplifications of the ground motion, mainly striking NE-SW, have been detected at the uppermost portion of the carbonate ridge on which the village is built. Geological/structural and geomechanical field surveys defined that the CS ridge is affected by sets of fractures, joints and shear planes – mainly roughly NW-SE and N-S trending – that are related to the deformation zone of the Subequana valley fault system and to transfer faults linking northward the mentioned tectonic feature with the Middle Aterno Valley fault system. In particular, our investigations highlight that seismic amplifications occur where joints set NW-SE trending are open. On the other hand, no amplification is seen in portions of the ridge where the bedrock is densely fractured but no open joints occur. The fracture opening seems related to the toppling tendency of the bedrock slabs, owing to the local geomorphic setting. These investigations suggest that the detected amplification of the ground motion is probably related to the polarization of the seismic waves along the Castelvecchio Subequo ridge, with the consequent oscillation of the rock slabs perpendicularly to the fractures azimuth.
    Description: Published
    Description: 841-868
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: JCR Journal
    Description: open
    Keywords: Site effects ; Rock site ; Ambient seismic noise ; Structural characteristics ; Geomechanical analyses ; Jointing ; Castelvecchio Subequo ; 2009 L'Aquila earthquake ; central Italy ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Publication Date: 2022-05-26
    Description: © The Authors, 2010. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License. The definitive version was published in Biogeochemistry 103 (2011): 109-124, doi:10.1007/s10533-010-9451-4.
    Description: As the planet warms, widespread changes in Arctic hydrology and biogeochemistry have been documented and these changes are expected to accelerate in the future. Improved understanding of the behavior of water-borne constituents in Arctic rivers with varying hydrologic conditions, including seasonal variations in discharge–concentration relationships, will improve our ability to anticipate future changes in biogeochemical budgets due to changing hydrology. We studied the relationship between seasonal water discharge and dissolved organic carbon and nitrogen (DOC and DON) and nutrient concentrations in the upper Kuparuk River, Arctic Alaska. Fluxes of most constituents were highest during initial snowmelt runoff in spring, indicating that this historically under-studied period contributes significantly to total annual export. In particular, the initial snowmelt period (the stream is completely frozen during the winter) accounted for upwards of 35% of total export of DOC and DON estimated for the entire study period. DOC and DON concentrations were positively correlated with discharge whereas nitrate (NO3 −) and silicate were negatively correlated with discharge throughout the study. However, discharge-specific DOC and DON concentrations (i.e. concentrations compared at the same discharge level) decreased over the summer whereas discharge-specific concentrations of NO3 − and silicate increased. Soluble reactive phosphorus (SRP) and ammonium (NH4 +) were negatively correlated with discharge during the spring thaw, but were less predictable with respect to discharge thereafter. These data provide valuable information on how Arctic watershed biogeochemistry will be affected by future changes in temperature, snowfall, and rainfall in the Arctic. In particular, our results add to a growing body of research showing that nutrient export per unit of stream discharge, particularly NO3 −, is increasing in the Arctic.
    Description: Funding provided by the National Science Foundation, NSF-OPP- 0436118.
    Keywords: Arctic ; Stream ; Headwaters ; Carbon ; Nitrogen ; Nutrients
    Repository Name: Woods Hole Open Access Server
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    Publication Date: 2022-05-26
    Description: © The Authors, 2010. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Coral Reefs 30 (2011): 23-38, doi:10.1007/s00338-010-0705-3.
    Description: Sediment traps are commonly used as standard tools for monitoring “sedimentation” in coral reef environments. In much of the literature where sediment traps were used to measure the effects of “sedimentation” on corals, it is clear from deployment descriptions and interpretations of the resulting data that information derived from sediment traps has frequently been misinterpreted or misapplied. Despite their widespread use in this setting, sediment traps do not provide quantitative information about “sedimentation” on coral surfaces. Traps can provide useful information about the relative magnitude of sediment dynamics if trap deployment standards are used. This conclusion is based first on a brief review of the state of knowledge of sediment trap dynamics, which has primarily focused on traps deployed high above the seabed in relatively deep water, followed by our understanding of near-bed sediment dynamics in shallow-water environments that characterize coral reefs. This overview is followed by the first synthesis of near-bed sediment trap data collected with concurrent hydrodynamic information in coral reef environments. This collective information is utilized to develop nine protocols for using sediment traps in coral reef environments, which focus on trap parameters that researchers can control such as trap height (H), trap mouth diameter (D), the height of the trap mouth above the substrate (z o ), and the spacing between traps. The hydrodynamic behavior of sediment traps and the limitations of data derived from these traps should be forefront when interpreting sediment trap data to infer sediment transport processes in coral reef environments.
    Keywords: Sediment trap ; Coral reefs ; Sedimentation ; Waves ; Currents ; Shear stress
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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    Helgoland marine research 1 (1938), S. 93-111 
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    Helgoland marine research 1 (1938), S. 141-161 
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    Helgoland marine research 1 (1938), S. 162-199 
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    Notes: Zusammenfassung der Hauptergebnisse 1. Die Morphologie und Systematik des DekapodenkrebsesCallianassa wurde an 6 europäischen Arten, unter denen sich 3 neue befanden, beschrieben und abgebildet. Diese 6 Arten bilden, obwohl sie z. T. erhebliche Abweichungen zeigen, doch einen einheitlichen Formenkreis. 2. Während die Darstellung der embryonalen Entwicklung vom Ei aus noch nicht gelang, wurde die postembryonale Entwicklung über IV Larvenstadien zum postlarvalen und Parvastadium sowie das voraussichtlich weitere Wachstum vonCallianassa behandelt und durch Abbildungen erläutert. 3. Die Oekologie des Krebses betreffend wurden seine horizontale und vertikale Verbreitung, seine Lebensweise und Umwelt geschildert. Insonderheit wurde die Bedeutung des Grabfußes, des optischen Apparates und der Tastorgane einer eingehenden Betrachtung unterzogen.
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    Helgoland marine research 1 (1938), S. 112-140 
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    Notes: Zusammenfassung 1.) Zur Prüfung der Wärmewertfaktoren für Protein, Aetherextrakt, Kohlenhydrate und Chitin bei Polychaeten, Crustaceen, Mollusken und Fischen wurde je ein relativ leicht zu beschaffendor Typ untersucht. 2.) Der aus experimentellen Daten durch Differenz bestimmte Wärmewert für Protein (5702 cal/g) stimmt mit den schon bekannten Werten für Eiweißprodukte (∼5662 bis ∼5858 cal/g) befriedigend überein. Der Aetherextrakt, der geringe Beimengungen als Folge der Analysenmethode enthält, hat einen etwas niedrigeren Heizwert (9166 cal/g) als bisher bekannt. Der Wert für das Glykogen (4094 cal g) ist ebenfalls etwas kleiner als der letzthin vonBrookens (3) gefundene Wert von 4215 cal g. Der Unterschied wird auf geringen Wassergehalt des in dieser Arbeit untersuchten Glykogens zurückgeführt. Der Wärmewert des Chitins beträgt 4513 cal/g. 3.) Es wurden Analysen vonArctica islandica, Cardium edule undCorbula gibba mitgeteilt. Die Wärmewerte dieser Tiere wurden mit den experimentell ermittelten Faktoren errechnet.
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    Helgoland marine research 1 (1938), S. 199-199 
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    Acta biotheoretica 4 (1938), S. 25-32 
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    Description / Table of Contents: Résumé La réduction des animaux de la mer profonde (zone abyssale) est un phénomène primordial. En rapport avec cela, des transformations compensatoriques de conservation personelle, encore non utilisées, rendent possible pour l'organisme, qu'en se réfugiant dans un milieu homogène (zones abyssales) il y puisse maintenir sa vie, de même, que dans un asile suprême. La réduction est un phénomène primordial automatique (autogène), la résidence dans le milieu homogène est un phénomène secondaire.
    Notes: Summary The reduction of deep-see animals is a primordial phenomenon. Connected with this, compensatory transformations of self-preservation, not yet gotten to validity, make it possible for the organism, that while descending in homogeneous surroundings (in abyssal zones) it may keep itself alive, maintaining its life in that last refuge. Reduction is a primordial automatical (autogeneous) phenomenon, permanent dwelling in homogeneous surroundings is a secondary phenomenon.
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    Acta biotheoretica 4 (1938), S. 51-64 
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    Description / Table of Contents: Résumé La conception de „prospektive Potenz” fut définie par son auteur H.Driesch comme „l'ensemble des modes de développement possibles d'une certaine partie de l'embryon”. Cependant, le, mot „Potenz” dans le langage de la science répond plutôt à la „puissance” qu'à la „possibilité”. De là résulte, que cette conception dès son origine avait une certaine ambiguïté, qui se fait sentir jusqu'à présent. La distinction entre „potentialité active” et „potentialité passive”, proposée par Roux, n'est pas acceptée généralement. Il se trouvait nécessaire, que la conception de „Potenz” fût soumise à une. analyse profonde. D'abord il est démontré, que l'ambiguïté de cette conception disparaît, si on entend par le mot „Potenz” les propriétés fondamentales du matériel embryonnaire, qui sont à la base de ses diverses possibilités de développement. On peut distinguer parmi ces propriétés les „pouvoirs réactifs”, en vertu desquels le matériel embryonnaire répond à des inductions morphogénétiques, et les „tendances propres” du matériel. Ils ne diffèrent que par leur intensité; un „pouvoir réactif” peut se changer en „tendance” par suite d'un renforcement au cours du développement, une „tendance” peut se changer en „pouvoir réactif” par une diminution d'intensité. La détermination du matériel se réalise par une „lutte” entre les tendances. Les actions inductives influent sur cette lutte en renforçant ou en diminuant l'intensité des diverses tendances, et en activant de nouvelles tendances par le renforcement de „pouvoirs réactifs”.
    Notes: Summary The conception of “prospective potency” was defined by its author H.Driesch as “the sum of the possible modes of development of a given part of the embryo”. However, in the language of science the word “potency” usually means “power”, not “possibility”. Therefore this conception from the beginning possessed a certain ambiguity, that it retained up to the present. The distinction of “active” and “passive” potency, introduced by Roux, has found no general acceptance. It appeared necessary to submit the conception of “potency” to a profound analysis. In the first place it is shown, that the ambiguity of this conception vanishes, if we understand by the word “potency” those fundamental properties of the embryonic material, that are responsible for its various developmental possibilities. We can distinguish among these properties the “reactive powers”, by which the embryonic material reacts to inductive stimulations, and its own “developmental tendencies”. These faculties only differ by their strength; a “reactive power” may change into a “tendency”, when its intensity increases during development; conversely, a “tendency” may change into a mere “reactive power” by a decrease of its strength. The determination of the material results from the conflict of its tendencies. The inductive actions interfere by strengthening or weakening different tendencies, and by activating new tendencies by reinforcement of the “reactive powers” of the embryonic material.
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    Acta biotheoretica 4 (1938), S. 85-96 
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    Description / Table of Contents: Résumé Dans l'organisation des divers animaux on peut distinguer les parallélismes suivants: 1) les homologies qui dénotent la descendance des porteurs des organes similaires d'un seul et même ancêtre, 2) les analogies qui se forment sous l'influence d'une fonction analogue ou des mêmes conditions extérieures, et 3) les homomorphies qui représentent la manifestation des propriétés fondamentales de la substance animée. Les homologies sont les phénomènes de l'ordre historique, tandis que les homomorphies et les analogies doivent être étudiées d'après une méthode typologique. Si une similitude homomorphique des formes se manifeste partout dans le règne animal ou au moins dans tous les cas où se trouvent des conditions favorables, il faut parler d'une homomorphie générale (p. ex. les structures trajectorielles). Si au contraire on observe le parallélisme seulement dans les cas isolés, comme p. ex. les yeux composés chez les Arthropodes, les Vers et les Mollusques, il faut parler de l'homomorphie spéciale. La limite entre ces deux catégories des phénomènes n'est pas très précise. De même il est difficile parfois de définir strictement si nous avons à faire à une homologie, à une analogie ou à une homomorphie. Tous ces phénomènes-là dépendent finalement des lois morphogénètiques. C'est pourquoi qu'on peut les indiquer comme des homomorphies dans le sens le plus étendu de ce mot.
    Notes: Zusammenfassung Man unterscheidet in der Organisation verschiedener Tiere folgende Kategorien von Parallelismen: 1) die Homologien, welche auf einen gemeinsamen Ursprung der betreffenden Organe hinweisen, 2) die Analogien, die als eine Folge von ähnlichen Funktionen (typische Analogie) oder der äusseren Wirkungen (Isomorphie) sekundär enstehen, 3) die Homomorphien, wodurch ich diejenigen Übereinstimmungen im Körperbau von verschiedenen Tieren bezeichne, welche auf Grund der allgemeinen Gesetze der Morphogenese zustande kommen. Das Studium der Homologien ist historischer Art, dasjenige der Homomorphien und Analogien typologischer Art. Man kann weiter unterscheiden: eine allgemeine Homomorphie, welche sich im Tierreiche überall, wo dazu günstige Bedingungen vorhanden sind, offenbart (z.B. trajektorielle Strukturen), und eine spezielle Homomorphie, welche als eine der Möglichkeiten bei einer begrenzten Anzahl von Tierformen hervortritt (z.B. die Komplexaugen neben den anderen drei Haupttypen von Sehorganen). Die Grenze zwischen diesen beiden Kategorien ist natürlich nicht sehr deutlich, ebenso wie manchmal die Grenze zwischen Homologien, Homomorphien und Analogien. Alle diese Erscheinungen beruhen letzten Endes auf morphogenetischen Gesetzen, können also als Homomorphien im weitesten Sinne des Wortes bezeichnet werden.
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    Acta biotheoretica 4 (1938), S. 133-153 
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    Description / Table of Contents: Résumé Après une mise au point générale de la relation entre les sciences théoriques et expérimentales, diverses questions sont discutées, du point de vue des fondations physico-mathématiques de la biologie, développées récemment par l'auteur. On montre par la comparaison des courbes calculées à celles observées, comment les relations prédites mathématiquement se trouvent vérifiées. Les questions suivantes sont discutées: respiration cellulaire, dimensions cellulaires et leur rapport au métabolisme, division cellulaire, mouvements protoplasmiques, excitation nerveuse, les lois psychophysiques, perception des formes géométriques.
    Notes: Zusammenfassung Nach einer allgemeinen Diskussion des Zusammenhanges zwischen theoretischer und experimenteller Forschung, wird in Hinblick auf die vom Verfasser entwickelten physikalisch-mathematischen Grundlagen der Biologie, eine Reihe von Einzelproblemen betrachtet. Es wird an Hand von Kurvenmaterial gezeigt wie weit die mathematisch vorausgesagten Beziehungen mit den experimentellen Befunden übereinstimmen. Folgende Fragen werden besprochen: Zellatmung, Zellgrössen, deren Abhängigkeit von Stoffwechsel, Zellteilung, Protoplasmaströmungen, Nervenerregung, psychophysische Gesetze, Reaktion auf geometrische Gestalten.
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    Acta biotheoretica 4 (1938), S. 1-24 
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    Description / Table of Contents: Résumé Le problème de l'asymétrie du protoplasma mérite un examen critique. Cela pourrait aider à formuler une série de questions fondamentales exigeant en premier lieu une étude expérimentale ultérieure. À commencer par la terminologie, on doit distinguer d'une part la dissymétrie, propriété de la molécule individuelle de posséder une image non superposable, qui apparaît à un niveau déterminé de complexité dans l'architecture spatiale de la molécule, et d'autre part, l'asymétrie comme une propriété des ensembles de molécules, représentant le manque dans ces ensembles de l'égalité de forme dissymétriques de droite et de gauche. Pour le biologiste, l'asymétrie des ensembles moléculaires est d'un intérêt particulier, en ce qu'elle présente une propriété spécifique du protoplasma, et qu'elle manque dans toutes les substances dissymétriques, qui se forment au cours des processus terrestres, indépendamment de l'activité des êtres vivants. On peut poser ici trois questions principales: 1. Quel est l'aspect descriptif de l'asymétrie du protoplasma? Quels sont les composants protoplasmiques pour lesquels l'asymétrie des ensembles moléculaires est obligatoire, et ceux pour lesquels elle ne l'est point, chez les divers représentants du règne animal et du règne végétal? 2. Quelle est la valeur physiologique de l'asymétrie protoplasmique, et de quelle manière cet état spécifique se maintient-il? 3. Comment, à la lumière de ces données, peut on se figurer l'origine de l'asymétrie du protoplasma? Dans l'essentiel, l'architecture asymétrique du protoplasma se ramène au fait que celui-ci est construit avec les représentants d'une série déterminée d'antipodes „naturels”. Par cela même il y a là un état de fixité précise du paramètre, qui caractérise les propriétés spatiales de la matière. Cet état de fixité est une condition importante pour la réalisation des délicates coordinations protoplasmiques. Á un point de vue plus général, l'état de fixité du paramètre spatial constitue un cas particulier de la proposition bien connue deClaude Bernard: „La fixité du milieu intérieur est la condition de la vie libre”. Dans le présent article on discute en détail les faits nombreux qui permettent d'affirmer que dans l'organisation physiologique de la cellule, une série d'adaptations spéciales profondes empêchent la racémisation du protoplasma, inévitable au point de vue thermodynamique, et maintenant l'état asymétrique spécifique du protoplasma. Éclairée ainsi par les faits, l'origine du protoplasma asymétrique peut s'expliquer à l'aide de la théorie de la sélection naturelle. L'état asymétrique du système protoplasmique, par comparaison avec l'état racémique, accorde à son possesseur nombre d'avantages biologiques.
    Notes: Zusammenfassung Das Problem der Asymmetrie des Protoplasmas bedarf einer kritischen Besprechung, die der Formulierung einer Reihe grundlegender Fragen, die in erster Linie einer weiteren experimentellen Bearbeitung bedürfen, förderlich sein kann. Vor allem muss hier mit der Terminologie begonnen werden. Man muss unterscheiden: die Dissymmetrie, als Eigenschaft des individuellen Moleküls ein sich mit dem Urbild nicht deckendes Spiegelbild zu besitzen, welche Eigenschaft bei einem bestimmten Niveau der Kompliziertheit der räumlichen Architektur des Moleküls eintritt, und, andererseits, die Asymmetrie als Eigenschaft der Gesamtheit der Moleküle, die in der Abwesenheit der Gleichheit der rechten und linken dissymmetrischen Formen in diesen Gesamtheiten besteht. Für den Biologen bietet die Asymmetrie der molekulären Gesamtheiten insofern Interesse, als sie eine spezifische Eigenschaft des Protoplasmas ist und bei allen dissymmetrischen Stoffen fehlt, die in den irdischen Prozessen unabhängig von der Tätigkeit lebender Wesen entstehen. Hier können folgende grundlegende Fragen gestellt werden: 1. Welcher Art ist der deskriptive Aspekt der Asymmetrie des Protoplasmas? Für welche Komponenten des Protoplasmas ist die Asymmetrie der molekularen Gesamtheiten bei den verschiedenen Vertretern des Tier- und Pflanzenreiches obligatorisch und für welche nicht? 2. Welcher Art ist die physiologische Bedeutung der Asymmetrie des Protoplasmas, und auf welche Weise wird dieser spezifische Zustand aufrechterhalten? 3. Wie kann man sich im Lichte aller dieser Daten die Entstehung der Asymmetrie des Protoplasmas vorstellen? Die asymmetrische Architektur des Protoplasmas läuft im Grunde darauf hinaus, dass das Protoplasma aus Vertretern einer bestimmten Reihe „natürlicher” Antipoden aufgebaut ist. Hierdurch findet eine genaue Fixiertheit des die räumlichen Eigenschaften des Stoffes charakterisierenden Parameters statt. Diese Fixiertheit ist eine wichtige Bedingung für die Verwirklichung der feinen protoplasmatischen Koordinationen. Von allgemeinerem Standpunkt aus ist die Fixiertheit des räumlichen Parameters ein Spezialfall des bekanntenClaude Bernard'schen Gesetzes: „La fixité du milieu intérieur est la condition de la vie libre”. Im Artikel werden zahlreiche Angaben eingehend besprochen, die es gestatten zu behaupten, dass eine Reihe spezieller und tiefer Anpassungen in der physiologischen Organisation der Zelle die vom thermodynamischen Standpunkt unvermeidliche Razemisation des Protoplasmas verhindern, und den spezifischen Zustand der Asymmetrie des Protoplasmas aufrechterhalten. Im Lichte dieser Angaben kann die Entstehung der Asymmetrie des Protoplasmas mit Hilfe der Theorie der natürlichen Zuchtwahl erklärt werden. Der asymmetrische Zustand des Protoplasmasystems verleiht seinem Besitzer eine Reihe biologischer Vorzüge im Vergleich mit dem razemischen Zustand.
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    Acta biotheoretica 4 (1938), S. 119-132 
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    Acta biotheoretica 4 (1938), S. 33-50 
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    Acta biotheoretica 4 (1938), S. 65-72 
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    Description / Table of Contents: Résumé 1) L'ontogenèse peut être expliquée de deux manières différentes: a) historiquement; elle se passe du passé au présent. b) idéalistiquement; elle se passe de l'universel au particulier. 2) Le développement du dimorphisme du sexe est contradictoire à l'interprétation historique et affirme la conception idéalistique. 3) Par conséquent il faut remplacer la morphologie phylogénétique par l'idéalistique. 4) De façon analogue l'idiogenèse et la morphogenèse se passent de l'universel au particulier. Il existe un parallélisme de l'ordre d'existence et de l'ordre des pensées.
    Notes: Summary 1) The Ontogenesis can be explained in a double way: a) historically: it runs from the past to the present. b) idealistically: it runs from the general to the special. 2) The development of the dimorphism of sex tells against the historical and for the idealistical perception. 3) Therefore the idealistical morphology has to be put in the place of the phylogenetical. 4) Idiogenesis and Morphogenesis are going analogically from the general to the special. There exists parallelism of the order of thinking and being.
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    Acta biotheoretica 4 (1938), S. 73-84 
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    Description / Table of Contents: Résumé Dans ce traité il s'agit d'une discussion de la conception de causalité „holistique” qui a remplacé l'autocratie de la „causalité mécanique”, du „mécanisme”. Dans des séquences d'événements, l'intellect reconnaît des causalnexus, en observant ou l'impulsion, le motif, le stimulus de l'action — ou, dans la transformation initiée, la conservation de la matière et de l'énergie: causalité impulsatrice („Anstosskausalität” A.K.) et causalité conservatrice („Erhaltungskausalität” E.K.). A l'ordinaire ces deux causalités sont étroitement liées; mais souvent elles se laissent distinguer sans difficulté. Par exemple, les effets catalytiques et les influences stimulantes sont expressément des formes de l'A.K. Si une „totalité” (un „tout”), c.-à-d. un système, un ordre en coïncidences, plus ou moins clos et stable, est „poussé” ou stimulé (du dehors ou de l'intérieur), il répond, du fonds de son énergie libre, par une action qui unit en soi l'A.K., l'E.K. et la réciprocité („Wechselwirkung” W.W.). Cette causalité complexe est la causalité holistique (la „Ganzheitskausalität” G.K.), déjà existante dans l'inorganique. Elle apparaît parfaite dans la causalité stimulus (la „Reizkausalität” R.K.) de l'organisme à tendances formatives et conservatives, ainsi que dans tous les rapports psychophysiques: A.K. psychique, causalité motive. Ainsi, il y a dans la „Mer constante de la matière et de l'énergie” un „courant d'inquiétude” qui se présente comme l'A.K. Cet „esprit” laisse reconnaître une distincte hiérarchie („Rangordnung”), s'étendant de la causalité dans la physique atomaire et la causalité mécanique, chimique et catalytique, jusqu'à l'„excitation” physio-biologique et jusqu'à la causalité directrice et évolutionnaire, psychique ou même „superpsychique”.
    Notes: Summary The article discusses the concept of “holistic” causality which has superseded that of “mechanistic causality”, “mechanism”. In a sequence of events a causal nexus is mentally established, attention being directed either to the initiation, the starting, the incitation of the process or to the conservation of matter and energy in the initiated transformation: initiation causality (“Anstosskausalität” A.K.) and conservation causality (“Erhaltungskausalität” E.K.). As a rule, the two kinds of causality are intimately interlinked, though they often are easily to be distinguished; for instance, catalytic causation and stimulus influences are clearly forms of A.K. If a “totality” (a “whole”), i.e., a more or les closed and stable uniformity of coexistences, is “pushed” or incited (from without or from within), it actively responds from its content of free energy by an event combining within itself A.K., E.K., and reciprocity (“Wechselwirkung” W. W.). This complex causality is holistic causality (“Ganzheitskausalität” G.K.). Holistic causality, already to be found in the inorganic, appears to perfection in the stimulus causality (“Reizkausalität” R.K.) of organism with its development of form and conservation of form; likewise in the entire psycho-physical phenomenation: psychic A.K., motive causality. Thus, in the constant “Ocean of matter and energy” there is a “demon of unrest” in the guise of A.K., setting up a distinct hierarchy (“Rangordnung”) ranging from atomistic causality to mechanic, chemical, and catalytic causality, and beyond to physiobiological “incitation” and to psychic, or even “supra-psychic”, direction and evolution causality.
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    Acta biotheoretica 4 (1938), S. 111-118 
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    Topics: Biology
    Description / Table of Contents: Résumé La biologie totalitaire qui, ces dernières années, a pris une très grande extension chez les biologistes et les philosophes, requiert une attitude nouvelle vis à vis du problème de la vie, attitude qui puisse nous mener au-delà de l'opposition entre le mécanisme et le vitalisme. Le mécanisme est rejeté par les partisans de la biologie totalitaire; la vie est plus qu'un processus physico-chimique excessivement compliqué. D'autre part la nature spéciale du processus vital devra être expliquée par l'idée totalitaire, comprise uniquement de la façon dont on l'entend dans les sciences naturelles. Cette nature spéciale ne devra pas être expliquée, comme le fait le vitalisme, par l'introduction de facteurs métaphysiques comme par exemple l'entéléchie. Le but de la présente critique est de démontrer que l'idée totalitaire est employée souvent par les partisans de la biologie totalitaire purement dans le sens de l'entéléchie, c'est à dire comme un principe métaphysique. D'autre part notre critique cherche à démontrer que la totalité, comprise uniquement de la façon dont on l'entend dans les sciences naturelles, ne nous mène pas au-delà de l'opposition entre le mécanisme et le vitalisme. Cela est vrai aussi pour le holisme deMeyer, dont l'idée fondamentale (la dérivation de la physique théorique de la biologie théorique par la simplification des formules) n'est pas nécessairement fausse pourtant et est en tout cas très digne de considération.
    Notes: Summary Holistic biology, which during the last years has gained wide acceptance amoungst biologists and philosophers, aspires to a new point of view as regards the problem of life which transcends the opposing theories of mechanism and vitalism. The exponents of holism repudiate the purely mechanical theory, the principle of life is something more than a highly complicated physico-chemical process. At the same time, however, the characteristics of life should be traced to the principles of pure natural science, untroubled by the introduction of metaphysical factors such as entelechy etc. This critical review endeavours to show that holism is often used by its exponents entirely in the sense of entelechy, that is to say as a metaphysical principle. On the other hand we seek to point out that where holism has been used in the sense of natural science it by no means bridges the gulf between mechanism and vitalism. The same comment applies to the holism ofMeyer, the foundation of which (namely the deduction of theoretical physics from theoretical biology by simplifying the formula) may be right after all and is worthy of consideration.
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    Description / Table of Contents: Résumé L'auteur continue la publication des résultats de ses recherches faites sur des êtres vivants unicellulaires, notamment desSaccharomyces. Cette publication fut communiquée dans les Acta Biotheoretica I, p. 113–132. Par la méthode de la culture unicellulaire, l'auteur a créé une culture pure et, de celli-ci, au moyen d'inoculations périodiques, il a créé des descendants. Il a mesuré la marche du développement en pesant le CO2 produit au cours de la vie. La courbe d'évolution ontogénétique, tant de la culture-mère que des descendants, a présenté une ligne enS, mais chacun de cesS ne montait pas de la même façon (Fig. 1). En représentant ces courbes d'évolution enS en fonction du temps et à l'échelle des périodes d'inoculation sur des coordonnées rectilignes, il obtenait une surface d'ondes (Fig. 2). En coupant cette surface par un plan parallèle à l'abscisse et à l'axe vertical, il obtenait des lignes ondoyantes qui ressemblaient à un mouvement oscillatoire se formant autour d'un axe à l'image régulière (Fig. 3). Les examens ont révélé que l'axe suit les lois du mouvement vibratoire harmonique apériodique et que la courbe ondoyante répond au phénomène du mouvement vibratoire harmonique périodique. L'un et l'autre provenant de l'équation différentielle communed 2 s/dt 2 + 2r ds/dt +w 2 s=o. N'importe quel point de l'axes h qui suit un mouvement vibratoire harmonique apériodique est déterminé par l'équation suivante: (8a) $$s_h = a_1 e^{ - r_1 t} \cdot \frac{{e^{ + t\sqrt {r_1 ^2 - w_1 ^2 } } - e^{ - t\sqrt {r_1 ^2 - w_1 ^2 } } }}{2} \cdot \cdot \cdot \cdot \cdot $$ cependant que la courbe ondoyante s p qui montre un mouvement vibratoire harmonique périodique est exprimée par l'équation suivante (8b) $$s_p = a_2 e^{ - r_2 t} \cos (t\sqrt {w_2 ^2 - r_2 ^2 } ) \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot $$ Le mouvement complety se compose de la somme des deux mouvements oscillatoires,y =s h +s p . Pour le moment, les examens n'ont trait qu'à l'axe apériodique. Les calculs prouvent que par l'équation sh (8a) les axes apériodiques appartenant à toutes les coupes (Fig. 4) peuvent être suivis avec exactitude comme fonctions du tempst, et que même le changement de la valeur des coefficientsw 1 ,r 1 ,a 1, présente aussi une régularité nette (Fig. 5, 6, 7). L'auteur examine ensuite le calcul du temps maximum=t max et, en outre, la valeur maximum =s hmax de l'axe de la courbe vibratoire et il énonce que toute cellule et tout organisme composé de cellules ont dans le cours de leur développement un temps maximum et une valeur maximum. Le tempst maximum sera: (24) $$t_{max} = \frac{I}{{\sqrt {r_{1^2 } - w_{1^2 } } \log e}}\log \sqrt {\frac{{r + \sqrt {r_{1^2 } - w_{1^2 } } }}{{r - \sqrt {r_{1^2 } - w_{1^2 } } }}} \cdot \cdot \cdot \cdot $$ En substituant la valeur dut max dans l'équation originale de l'axe (8a), on obtient la valeur numérique dut max . Finalement, après avoir déterminé le fait que dans le développement des êtres vivants, on est en présence d'un mouvement vibratoire harmonique périodique et que l'axe de cette oscillation complexe suit l'équation du mouvement vibratoire harmonique apériodique, l'auteur constate que cette détermination constitue un résultat fondamental pour l'étude théoritique des phénomènes vitaux et ce résultat possède en même temps une grande importance pratique pour l'étude de l'amélioration, du sélectionnement, de l'hérédité et de la biologie de la race.
    Notes: Summary Author continues the publication which appeared in the Acta Biotheoretica I, p. 113–132, regarding his results obtained in course of research work on superior plants:Picea excelsa trees, and furthermore on unicellular living beings, namely yeast cells (Saccharomyces spec). Author made a pure culture with the unicellular culture method, and by occasional inoculation produced successors therefrom. He established the progress in development by measuring, according to weight, the CO2 which arose in course of life. The ontogenetic course of development of the original culture as well as that of the successors took the form ofS but theseS curves were not equally precipitous (Fig. 1). When he drew theS-formed development curves in the measure of their time of inoculation in a rectangular co-ordinate system, he received a wave-surface (Fig. 2). When he intersected the wave-surface with the abscissa and the plane parallel with the vertical axis, wave-like lines were the result, which resembled vibratory motion evolving around an axis producing a regular picture (Fig. 3). Research has ascertained that the axis follows the laws of aperiodic vibratory motion, the undulating curve corresponds with the phenomenon of periodic vibratory motion, both of which are derived from the common differential equationd 2 s/dt 2 + 2r ds/dt +w 2 s=o. Any point of thes h axis following the aperiodic vibratory motion is given by the following equation: (8a) $$s_h = a_1 e^{ - r_1 t} \cdot \frac{{e^{ + t\sqrt {r_1 ^2 - w_1 ^2 } } - e^{ - t\sqrt {r_1 ^2 - w_1 ^2 } } }}{2} \cdot \cdot \cdot \cdot \cdot $$ while the wave-curve showing thes h periodic movement is given by the following equation: (8b) $$s_p = a_2 e^{ - r_2 t} \cos (t\sqrt {w_2 ^2 - r_2 ^2 } ) \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot $$ The completey movement is made up of the total of the two vibratory movementsy=s h +s p . The research for the time being refers merely to the aperiodic axis. Calculations show that with thes h equation, the aperiodic axes belonging to all the sections (Fig. 4) can be followed exactly, as the time function oft, and moreover, the change according to time in the size of the w1, r1, a1 coefficients also shows definite regularity (Figs 5, 6, 7). Author deals separately with the calculation of the axis maximal time =t max and the maximal value = s h max of the wave-curve, and establishes that the development speed of every cell and every organism built up from cells has a maximal point of time and a maximal value. Thet maximum point of time: (24) $$t_{max} = \frac{I}{{\sqrt {r_{1^2 } - w_{1^2 } } \log e}}\log \sqrt {\frac{{r + \sqrt {r_{1^2 } - w_{1^2 } } }}{{r - \sqrt {r_{1^2 } - w_{1^2 } } }}} \cdot \cdot \cdot \cdot $$ If we put thet max value in the place of the original (8a) equation of the axis we get the numeric value of thet max . Author finally establishes that the recognition of the fact that a harmonic vibratory motion plays a part in the evolution of living beings and that the axis of this complicated vibration follows the equation of aperiodic vibratory motion is a fundamental result in the theoretic study of the phenomena of life, which, besides, has also a great practical importance in the sphere of the study of improvement, inheritance and the biology of the species.
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    Acta biotheoretica 4 (1938), S. 154-164 
    ISSN: 1572-8358
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    Topics: Biology
    Description / Table of Contents: Résumé Les problèmes actuels, se trouvant sur le terrain du système nerveux organo-végétatif ont besoin d'être considérés d'un point de vue synthétique, qui unit les données morphologiques et fonctionnelles. Quant au développement phylogénique du système autonome on est obligé de reconnaître l'insuffisance de la théorie de l'origine ectodermale. Les dates phylogéniques montrent que le système susnommé doit être une differentiation d'une fonction intercellulaire et amboceptoire chez les organismes primitives. Dans ce sens chaque fonction a sa place. Le principe de la „toponomie holosynaptique” exprime la condition spatiale à laquelle doivent obéir toutes les possibilités de développement morphologique d'un système conducteur. Quant à la phylogénie du système végétatif ces considérations mènent jusqu'à une croissance de l'importance du rôle du mésoderme. Ce tissu, surtout considéré dans les théories plutôt en disgrace deTello et d'autres, doit présenter l'origine de quelques éléments tissulaires nerveux. Les données histologiques et celles de l'anatomie comparative, tant que la théorie de la neurobiotaxis sont en accord avec la conception développée.
    Notes: Summary Certain problems about the autonomic nervous system — as f.i. those about the development of ortho- and parasympathetic system — have to be seen in the light of synthetic morphologic-functional considerations. As for the origin of the vegetative nervous elements, the phylogenetic dates show, how the theory of ectodermal descent is one-sided from functional synthetic point of view. Every intercellular function has her place. Therefore the principle of “holosynaptic toponomy” conditions the possibilities of morphological development of every tissue conducting stimuli. In the case of the autonomic system this principle stresses the meaning of the importance of the mesoderm as a base of differentiation to certain nervous elements. Histological, comparative anatomical facts as well as the theory of neurobiotaxis are shown to be very well in harmony with the developed conception.
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    The European physical journal 108 (1938), S. 19-23 
    ISSN: 1434-601X
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    Topics: Physics
    Notes: Zusammenfassung Es wird untersucht, wie sich die Zähleigenschaften von Zählrohren durch Ausheizen und Füllen mit reinem Wasserstoff ändern.
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    The European physical journal 108 (1938), S. 1-18 
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    Notes: Zusammenfassung Es wird die Zündung und die Zündspannungssenkung untersucht unter der Voraussetzung, daß diese abhängen sowohl von der γ-Ionisierung als auch von sekundären Effekten. Die früher gefundenen Gesetzmäßigkeiten I bis III (vgl. unten) beruhen darauf, daß „quadratische Erregungen“ in die Gleichgewichts — bedingung eingeführt und durch Änderung der γ-Ionisierung mit der Raumladung begründet wurden. Zu den gleichen Gesetzmäßigkeiten I bis III führen daher auch alle sekundären Effekte, die durch quadratische Erregungen in der Gleichgewichtsbedingung berücksichtigt werden können. Die früher angegebenen Koeffizienten erfahren dadurch eine Erweiterung, die geeignet ist, die bisher nicht genügende Übereinstimmung zwischen Versuch und Rechnung bei Edelgasen zu beheben.
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    Notes: Zusammenfassung Es werden die Schwerpunkte der in den Emissionsspektren verschiedener Zn S-Phosphore auftretenden Banden bestimmt und untersucht, wie die einzelnen Banden der Gegenwart bestimmter Fremdmetalle oder dem Eigenleuchten des Grundmaterials zuzuordnen sind. Die bei Zusatz von CdS eintretende Verschiebung der Bandenschwerpunkte wird an einer Reihe von Phosphoren mit zunehmendem CdS-Gehalt untersucht und gezeigt, daß die Lage der Maxima mit dem molaren Verhältnis der Komponenten in regelmäßigem Zusammenhang steht. Auf ähnliche Beobachtungen Travničeks an CaSSrS-Mischphosphoren wird hingewiesen. Schließlich wird nachgewiesen, daß CdS nicht nur mit ZnS, sondern auch mit Erdalkalisulfiden Mischphosphore bildet.
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    The European physical journal 108 (1938), S. 40-44 
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    Topics: Physics
    Notes: Zusammenfassung Die Bande des S2 λ 2799 (v′=10,v″=0) weist in Absorption und mit großer Dispersion deutliche Verbreiterung der Rotationslinien auf. Die Prädissoziationsgrenze muß daher bei λ 2829 (früher λ 2799) angenommen werden. Weil ein großer Unterschied in den Linienbreiten von den Banden λ 2799 und λ 2769 auftritt, liegt hier ein Fall von langsam einsetzender Prädissoziation vor. — Die Beobachtungen von Lochte-Holtgreven über Druckeinwirkung auf das prädissoziierte Gebiet konnten nicht bestätigt werden.
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    The European physical journal 108 (1938), S. 45-54 
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    Notes: Zusammenfassung Der Sprung der Dielektrizitätskonstante des festen HCl bei seinem Umwandlungspunkt (990abs.) wird zwischen 30 und 5000m Wellenlänge untersucht. Für Temperaturen unterhalb der Umwandlung werden Dispersion und dielektrische Verluste festgestellt, die bei der Umwandlung selbst ein Maximum erreichen. Bei 850 abs. liegen die stärkste Dispersion und der größte Verlust bei etwa 300m und rücken mit steigender Temperatur nach kurzen Wellen.
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    The European physical journal 108 (1938), S. 101-106 
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    Notes: Zusammenfassung Für Äthylalkohol- und Methylalkohol-Wasser-Mischungen wurden die Oberflächenspannungen und ihre Temperaturkoeffizienten bestimmt, um insbesondere Aufschluß zu erhalten über die Abhängigkeit des Temperaturkoeffizienten von der Konzentration.
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    The European physical journal 108 (1938), S. 85-100 
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    Topics: Physics
    Notes: Zusammenfassung In früheren Arbeiten ist eine Methode zur Ultrarotphotographie angegeben worden, die das Auftreffen der Strahlung dadurch kenntlich macht, daß eine Substanz an der getroffenen Stelle durch die Wärmewirkung der ultraroten Strahlen zum Verdampfen gebracht wird. In der vorliegenden Arbeit wird über den Ausbau der Methode zu einem praktisch brauchbaren Verfahren berichtet. Es werden Vergleiche mit den bisherigen Empfangsinstrumenten und den ultrarotsensibilisierten Platten durchgeführt und einige Absorptionsspektren im Bereich von l bis 10 μ gebracht.
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    The European physical journal 108 (1938), S. 107-127 
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    Notes: Zusammenfassung Das Verhalten fester Dielektrika im elektrischen Wechselfeld wird unter der Voraussetzung untersucht, daß der „Nachwirkungsstrom“i(t) einem zeitlichen Verlauf der Formi(t)=B(ϑ+t)−n folgt. Die Ergebnisse werden mit den Resultaten bereits vorliegender experimenteller und theoretischer Untersuchungen verglichen.
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    Notes: Zusammenfassung 1. Aufgabenstellung. 2. Zusammenfassung der Beziehungen für die quantitative Untersuchung des Primärstromes in isolierenden Kristallen, die in unseren früheren Arbeiten benutzt worden sind. 3. Die Anwendbarkeit der gleichen Beziehungen auf die Messung stationärer Primärströme in Kristallen mit elektrolytischer Dunkelleitung. 4. Der Einfluß des lichtelektrischen Stromes auf die Feldverteilung in Kristallen mit elektrolytischer Dunkelleitung. 5. Elektronische Dunkelleitung führt zur Entstehung des Sekundärstromes. 6. Die quantitative Behandlung der lichtelektrischen Ströme in Gemischtleitern, d. h. in Kristallen mit sowohl elektrolytscher wie elektronischer Dunkelleitung. Sie wird zunächst nur für den Grenzfall der Sättigungsströme durchgeführt und sie zeigt, daß auch beim Auftreten von Sekundärströmen Sättigung erreicht werden kann. 7. Die allgemeine Beziehung für Gemischtleiter bei Berücksichtigung der Elektronenverluste. Es werden Elektronenverluste nach einem Exponentialgesetz zugrunde gelegt und Versuchsbedingungen vorausgesetzt, bei denen auch im belichteten Kristall eine praktisch lineare Peldverteilung erhalten bleibt. 8. Die elektrischen Eigenschaften unseres KH-KBr-Modellhalbleiters im Dunkeln. 9. Begründung für die Anwendbarkeit des exponentiellen Verlustgesetzes im KH-KBr-Modellhalbleiter. 10. Lichtelektrische Messungen am KH-KBr-Mischkristall mit nur elektrolytischer Dunkelleitung: 1. Kristalle mit homogener Belichtung; 2. Kristalle mit Lichtsonde. 11. Lichtelektrische Messungen am KH-KBr-Mischkristall mit elektronischer und elektrolytischer Dunkelleitung. 12. Lichtelektrische Primärströme, die trotz eines exponentiellen Verlustgesetzes der Wurzel aus der Lichtintensität proportional sind. 13. Zusammenfassung.
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    The European physical journal 108 (1938), S. 128-136 
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    Notes: Zusammenfassung Es wird gezeigt, daß der von Blackettfestgestellte Abfall des relativen Energieverlustes eines Elektrons beim Durchgang durch Metallplatten sich aus der Annahme einer kleinsten Wellenlänge von λ0=6,2 · 10−13cm (±10%) einwandfrei erklären läßt. Zum gleichen Wert führt eine Diskussion des aus dem Breiteneffekt ermittelten Energieverlustes, den ein Elektron beim Durchgang durch die Atmosphäre erleidet, sowie die Tatsache, daß die Energie der Schauerteilchen nach oben hin begrenzt erscheint.
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    The European physical journal 108 (1938), S. 681-697 
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    Notes: Zusammenfassung Die von Hiedemann und Mitarbeiter entwickelte Sichtbarmachungsmethode zur Bestimmung der Schallgeschwindigkeiten in Flüssigkeiten wird zu einer Präzisionsmethode hoher Absolutgenauigkeit ausgearbeitet. Zur absoluten Bestimmung der Schallfrequenz wurde eine Frequenzmeßeinrichtung konstruiert, deren Genauigkeit durch eine einzige Leuchtnormale gewährleistet wird. Die Leuchtquarzfrequenz wird durch Frequenzteilung beliebig untersetzt, und man kann eine Absolutgenauigkeit der Frequenzmessung von weit besser als 5 · 10−6 erreichen. Die zur Erzeugung der Schallwellen erforderliche Hochfrequenzwechselspannung wird von einem elektronengekoppelten Oszillator geliefert, der zur Erzielung einer großen Frequenzkonstanz in einen vollautomatisch arbeitenden Luftthermostaten eingebaut ist. Mit der so verbesserten Meßanordnung wird die Schallgeschwindigkeit verschiedener organischer Flüssigkeiten in Abhängigkeit von der Temperatur mit einer Absolutgenauigkeit von 6 bis 7 · 10−5 bestimmt. Aus den gemessenen Werten wird der Temperaturkoeffizient für das Intervall von 23 bis 27
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    The European physical journal 108 (1938), S. 698-713 
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    Notes: Zusammenfassung Es wird gezeigt, daß geschichtete Feldkathoden vom Aufbau Al-Al2O3-Cs2O im Hochvakuum außer durch schnelle Elektronen auch durch positive Gasionen angeregt werden können. — Durch Einlassen von Edelgas läßt sich die Erscheinung des abklingenden Malter-Stromes in eine Spritzentladung überführen, und umgekehrt geht aus dieser Entladung durch Abpumpen des Gases der Malter-Strom hervor. In Argon und Helium wurden zwei Spritzentladungstypen bei Drucken zwischen 10−4 und 1 Torr beobachtet, deren eine mit niedriger Brennspannung ohne Funkeln auf der Kathode und deren andere bei höherer Brennspannung mit Funkeln auf der Kathode brennt. — Die Emission der Feldkathoden erweist sich als stark temperaturabhängig. Mit steigender Temperatur nimmt die Emission stark ab und gleichzeitig nimmt die Abnahmegeschwindigkeit des abklingenden Malter-Stromes zu. — Aus den Vorgängen bei der Aktivierung der Malter-Kathode und ihrer Entaktivierung durch Sauerstoff wird auf den Aufbau der Kathodenschicht geschlossen.
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    Notes: Zusammenfassung Es ist der Intensitätsverlauf der Linien der CuH-Bande λ 4280 bei Anregung im Bogen und bei Anregung in der mit Wasser und mit flüssiger Luft gekühlten Hohlkathode untersucht worden. Dabei wurde folgendes festgestellt: Im Bogen wird die Verteilung der Moleküle auf die verschiedenen Rotationszustände entsprechend der Boltzmann-Verteilung gefunden. In der Hohlkathode wird dagegen eine andere Verteilung beobachtet, die als Verteilung der Moleküle auf die verschiedenen Rotationszustände durch den Elementarprozeß der Molekülbildung gedeutet wird, da, wie gezeigt wird, die bisher bekannten Effekte für eine Erklärung nicht in Frage kommen. Gleichzeitig ändert sich auch die relative übergangswahrscheinlichkeit, und die Intensitäten der Linien von einem gemeinsamen Anfangszustand folgen im Gegensatz zum Bogen nicht mehr den Formeln nach Hönl und London. Es wird weiter gezeigt, daß man den Intensitätsverlauf in der Hohlkathode durch eine einfache Beziehung darstellen kann.
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    The European physical journal 108 (1938), S. 739-747 
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    Topics: Physics
    Notes: Zusammenfassung Aus der Hyperfeinstrukturaufspaltung einiger Linien des Al-II-Spektrums wurde mit Hilfe der Land éschen Intervallregel für das mechanische Kernmoment des Aluminiums der WertI=5/2 ermittelt, für das magnetische der WertΜ=3,7 KM. Das Ergebnis wird dem kürzlich (siehe unten) von Jackson und Kuhn angegebenen WertI=9/2 gegenübergestellt und insbesondere bezüglich der etwa möglichen Störungen der Intervallregel diskutiert.
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    The European physical journal 108 (1938), S. 726-738 
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    Topics: Physics
    Notes: Zusammenfassung Von den zahlreichen Forschungsarbeiten auf dem Gebiete der künstlichen Radioaktivitäten betrachten verhältnismäßig wenige solche Stoffe, die durch Aktivieren mit α-Teilchen erzeugt worden sind. Denn einmal bieten die α-Prozesse nicht das ausgedehnte Betätigungsfeld, wie es die Neutronenprozesse wegen der überaus zahlreichen Umwandlungsmöglichkeiten eröffnen, zum andern sind bei ihnen auch die experimentellen Schwierigkeiten größer. —In der vorliegenden Arbeit handelt es sich um die Untersuchung der Umwandlungen: Na (α; Nn)Al und P (α; Nn)Cl. — Das Interesse des Physikers richtet sich bei den Umwandlungsprozessen besonders auf die energetischen Verhältnisse. Daher sind gerade die α-Umwandlungen von Bedeutung, weil man es bei ihnen — in weiterem Maße als bei den Neutronenprozessen — in der Hand hat, mit wohldefinierten Geschoßenergien und -zahlen zu arbeiten. Die beiden genannten Kernreaktionen sind zwar schon lange bekannt, die dabei umgesetzten Energien aber noch nicht näher untersucht worden. Die Arbeit will dazu beitragen, diese Lücke zu schließen. — Nebenbei wird eine Methode angegeben, das spezifische Ionisationsvermögen einzelner Positronen exakt zu bestimmen.
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    The European physical journal 108 (1938), S. 748-770 
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    Topics: Physics
    Notes: Zusammenfassung Es werden die Depolarisationsgrade und die Intensitäten von Raman-Linien bei verschiedenen Kristallstellungen an Kalkspat, Quarz und Beryll untersucht und quantitativ bestimmt. Besonders hervorzuheben ist eine Anordnung, die es ermöglicht, den Polarisationszustand von Raman-Linien auch bei optisch aktiven Substanzen zu messen. Der Vergleich mit der Theorie von Placzek über den Einfluß der Kristallsymmetrie bestätigt die bekannten Zuordnungen der Schwingungen des Kalkspats; Schwierigkeiten ergeben sich nur bei der Pulsation der CO3-Gruppe; diese werden diskutiert. Bei Quarz und Beryll ergeben sich Zuordnungen, die mit der Deutung des ultraroten Silikatspektrums (nach Schaefer, Matossi, Wirtz) in Einklang sind.
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    The European physical journal 108 (1938), S. 771-776 
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    Topics: Physics
    Notes: Zusammenfassung Es wird eine elektronenoptische Methode beschrieben, mit deren Hilfe gleichzeitig ein Ionenemissionsbild und ein Elektronenemissionsbild von emittierenden drahtförmigen Körpern auf demselben Leuchtschirm sichtbar gemacht werden kann. Das Ionenemissionsbild wird dabei zuerst in ein Sekundärelektronenbild umgewandelt. Die Methode wird auf Emissionsuntersuchungen an glühenden Steatitröhrchen angewandt.
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    The European physical journal 108 (1938), S. 777-779 
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    Topics: Physics
    Notes: Zusammenfassung Es wird an Zählrohren versucht, die Zählrohrspannung mit rhythmischen Spannungsstößen zu überlagern; dadurch kann die maximale Stoßzahl der Zählrohre festgestellt werden. Die übereinstimmung mit den Resultaten verschiedener Zählrohrschaltungen wird diskutiert.
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    The European physical journal 108 (1938), S. 780-785 
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    Topics: Physics
    Notes: Zusammenfassung An Kathoden aus K, Mg, Al, Cu, Fe, Ag, Pt wurde untersucht, wie sich die Elektronenablösung durch den Stoß positiver Ionen ändert, wenn die Oberflächen mit Deckschichten insbesondere mit Oxydschichten bedeckt werden. Es zeigte sich, daß dadurch die Elektronenablösung stets vergrößert wird, beispielsweise bei Mg und 2000 Volt fast auf den fünffachen Wert. Mit Hilfe dieses Verhaltens kann der Vorgang der Beseitigung einer Oxydschicht durch Kathodenzerstäubung oder ihre Neubildung durch Einführen von Sauerstoff oder analog auch einer Hydridschicht genau verfolgt werden.
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    The European physical journal 108 (1938), S. 137-152 
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    Topics: Physics
    Notes: Zusammenfassung Durch Berücksichtigung der Oberflächenenergie der Wand zwischen entgegengesetzt mägnetisierten Bezirken werden die theoretischen Schwierigkeiten bebeseitigt, die bisher dem Verständnis der Versuche von Sixtus über das Auswachsen der Ummagnetisierungskeime bei den großen Barkhausen-Sprüngen entgegenstanden. Durch Auswertung der Messungen von Sixtus wird erstmalig eine experimentelle Angabe über die Größe der Wandenergie gewonnen, die in guter Übereinstimmung mit dem von Bloch theoretisch gefundenen Wert ist.
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    The European physical journal 108 (1938), S. 162-167 
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    Topics: Physics
    Notes: Zusammenfassung Durch Verdampfung gewonnene, dünne (0,2–2,5 μ) NaCl-Schichten haben eine sehr große spezifische elektrische Leitfähigkeit mit sehr kleinen Ionenablösungsarbeiten. Es ist eine Abhängigkeit von der Schichtdicke vorhanden.
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    The European physical journal 108 (1938), S. 153-161 
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    Topics: Physics
    Notes: Zusammenfassung Aus der Diffusionsgleichung wird abgeleitet, wie ein Zusatz von Cadmiumsalz zu Wasser die Konzentration von thermischen Neutronen beeinflußt. Die gefundene Beziehung wird durch Experimente bestätigt. Die Messungen ermöglichen die Relativbestimmung des reinen Absorptionsquerschnitts von Wasserstoff bezogen auf den von Cadmium.
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    The European physical journal 108 (1938), S. 168-170 
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    Notes: Zusammenfassung In Hg I wurde eine neue Serie aufgefunden, welche dem Übergang vom Termmd 3,1 D zu einem neuen Term 5d 9 6s 2 6p 3 D 3 entspricht. Über die Lage des Terms 5d 9 6s 2 6p 1 F 3 wurden einige Bemerkungen gemacht.
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    The European physical journal 108 (1938), S. 183-188 
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    Notes: Zusammenfassung Es wird gezeigt, daß die ursprüngliche Form des Nernstschen Wärmesatzes bestehen bleibt, auch wenn es gelingt, den absoluten Nullpunkt zu erreichen.
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    The European physical journal 108 (1938), S. 189-194 
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    Topics: Physics
    Notes: Zusammenfassung Aus dem Drehimpulserhaltungssatz und den Auswahlregeln für Kernumwandlungen wird die Winkelverteilung der Kerntrümmer gefolgert. Die Ergebnisse werden an den Prozessen H2(d; p) H3, H2(d; n) He3, Li6 (d; p) Li7, Li6 (p; α)He3, Li7 (p; α) He4, B11(p; α) Be8 geprüft.
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    The European physical journal 108 (1938), S. 171-182 
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    Topics: Physics
    Notes: Zusammenfassung Mit einer Ionisationskammer von 20,5 Liter Inhalt, die mit Preßluft gefüllt war, wurden Untersuchungen über die Druckabhängigkeit der Ionisation durch Ultrastrahlung in dem Bereich von Normaldruck bis 37 Atm. durchgeführt. Die Messungen ergaben, daß sich die Ionisation aus zwei Komponenten, einer energiereichen Primärstrahlung und einer energieärmeren Sekundärstrahlung, die in den Kammerwandungen ausgelöst wird, zusammensetzt. Durch Berücksichtigung der auf rechnerischem Wege erhaltenen Restionisation der verwendeten Ionisationskammer und des Sättigungsgrades der Kammerspannung konnte ein eindeutiger Verlauf der Ionisationsstrom-Druckkurven gegeben werden. — Die Druckabhängigkeit der Ionisation durch Ultrastrahlung ist von der durch γ-Strahlung in dem untersuchten Druckbereich bis 37 Atm. verschieden. — Durch Verwendung von Absorptionsmaterialien (Blei, Aluminium, Eisen) in der Druckkammer konnte die Bildung einer Sekundärstrahlung von geringer Energie nachgewiesen werden. Reichweite und Intensität der ausgelösten Sekundärstrahlung ergaben bei den einzelnen Absorptionsmaterialien ein grundsätzlich verschiedenes Bild.
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    The European physical journal 108 (1938), S. 195-199 
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    Topics: Physics
    Notes: Zusammenfassung Die Dämpfung piezoelektrischer Schwingungen einer Quarzplatte wird mit Hilfe einer neuen Methode untersucht. Die Verwendung einer Braunschen Röhre gestattet den Abklingvorgang eines elektrisch in seiner Eigenfrequenz erregten und dann frei ausschwingenden Piezokristalls photographisch aufzunehmen. Die Dämpfung nimmt mit sinkender Temperatur stark ab und erreicht bei −100° C einen annähernd konstanten Wert.
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    The European physical journal 108 (1938), S. 200-203 
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    Topics: Physics
    Notes: Zusammenfassung Dieser wird erzeugt von den Erweiterungen eines hyperkomplexen Zahlsystems 1), welches der Verfasser als Angelpunkt aller quantenmechanischen Matrizensysteme erkannt hat. Die neue Raum-Zeit-Struktur wird angegeben. Zu ihrer Eichung benötigt man drei Meßwerte (g, cm, sec). Die physikalischen Konstanten sind hierauf theoretisch berechenbar. Im besonderen werden Eigenschaften der Elementarteilchen quantitativ erfaßt.
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    The European physical journal 108 (1938), S. 212-217 
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    Topics: Physics
    Notes: Zusammenfassung Es wurden mit drei verschiedenen Anordnungen Messungen angestellt über das Zahlenverhältnis der nicht-ionisierenden zu den ionisierenden Strahlen in einem kosmischen Ultraschauer. Die ionisierenden Strahlen wurden dabei durch das Auftreten von Koinzidenzen, die nicht-ionisierenden durch das Ausbleiben von Koinzidenzen festgestellt. Es ergab sich, daß mit jedem Elektronenschauer ein relativ intensiver und stark diffuser Photonenschauer verkoppelt ist. Es entfallen in einem Schauer auf ein Elektron rund 50 Photonen.
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    The European physical journal 108 (1938), S. 204-211 
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    Topics: Physics
    Notes: Zusammenfassung Es wurde die Hyperfeinstruktur der verbotenen Quecksilberbogenlinie 2655,8 Å, die bei optischer Anregung des Hg-Dampfes und bei Zusatz von Stickstoff auftritt, mittels eines hochauflösenden Spektralapparates untersucht. Es hat sich ergeben, daß diese Linie aus zwei Komponenten besteht, die von den zwei ungeradzahligen Hg-Isotopen emittiert werden. Die Durchbrechung des für die Impulsquantenzahl J geltenden Verbots J=0 → J=0 wird durch die Kopplung des magnetischen Moments des Kerns mit dem Leuchtelektron verursacht.
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