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  • 2005-2009  (607)
  • 1940-1944
  • 2008  (607)
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  • 2005-2009  (607)
  • 1940-1944
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  • 11
    Electronic Resource
    Electronic Resource
    Mechanical Characterization of Friction Stir Welds of Two Dissimilar Aluminium Alloys of the 6xxx Series (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 587-588 (June 2008), p. 430-434 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A study on the mechanical characterization of friction stir welds between aluminiumalloys 6061-T6 and 6082-T6 was carried out. For comparison, single alloy joints made from eachone of the two alloys were also performed. The work included microstructure examination,microhardness tests, tensile tests and bending tests of all joint types. An approximate finite elementmodel of the joint, taking into account the spatial dependence of the tensile strength properties, wasmade, modelling a bending test of the weldments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.430.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Rhodamine 6G Encapsuled Mesoporous Silica Channels (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 55 (Sept. 2008), p. 62-67 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: We report the effect of solvent on the rhodamine 6G encapsuled into channels ofmesoporous silica, synthesized by two-step process that gives intermediary stable hybrid micelles.Mesoporous materials have been obtained by the method that involves surfactant micelles (mainlycationic) and inorganic precursor of the structure to be obtained. MSU-X type mesoporous silicahas been synthesized with polyethylene oxide surfactant as the directing-structure agent andtetraethyl orthosilicate Si(OEt)4 as the silica source. The influence of the solvent on theencapsulation of rhodamine dye was systematically explored, specially its influence on theluminescence properties. Rhodamine 6G encapsuled into mesoporous silica channel wascharacterized by UV-Vis and luminescence spectroscopies, scanning electron microscopy, smallangle x ray scattering and N2 sorption-desorption. The pore size and the solvent effects intoluminescence dye encapsuled into mesoporous silica channels are observed in the visible absorptionand emission spectra of rhodamine 6G. The intense photoluminescence band of rhodamine 6G dyeis in 500 to 600 nm region. The observed shift of the absorption and emission bands can be assignedto the effect of the solvents dielectric constant and pore size of mesoporous silica
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.55.62.pdf
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  • 13
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    Vorhersage und Management von Sturzfluten in urbanen Gebieten (URBAS) : Förderprogramm des BMBF: Risikomanagement extremer Hochwasserereignisse (RIMAX) (2008)
    TIB
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/report
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  • 14
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    Stochastic strong-motion simulation of the Umbria-Marche earthquake of September 1997 (Mw 6): comparison of different approaches (2008)
    Seismological Society of America
    Details
    Publication Date: 2017-04-04
    Description: Abstract We simulated strong-motion records from the Umbria–Marche, central Italy, earthquake (Mw 6) of September 1997 using a frequency-dependent S-wave radiation function. We compared the observed acceleration spectra, from strongmotion instruments located in the near field and at regional distances, with those simulated using the stochastic modeling technique of Beresnev and Atkinson (1997, 1998), and modified to account for a frequency-dependent radiation pattern correction. By using the frequency-dependent radiation function previously obtained by Castro et al. (2006), we reduced the overall fitting error of the acceleration spectra by about 9%. In general, we observed that the frequency-dependent radiation pattern correction has a small effect on the spectral amplitudes compared with site effects, which is an important factor controlling the strong-motion records generated by the 1997 Umbria–Marche earthquake. In addition, we modeled the observed ground-motion records using the dynamic corner frequency model of Motazedian and Atkinson (2005) to reproduce the directivity effects, reducing the average error of the spectral amplitudes by 24%. We concluded that although the frequencydependent radiation pattern correction affects the frequency content of the spectral amplitudes simulated, site and directivity effects are more relevant.
    Description: Published
    Description: 662–670
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: JCR Journal
    Description: reserved
    Keywords: strong motion ; simulation ; 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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  • 15
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    Body-wave Attenuation in the Region of Garda, Italy (2008)
    springer
    Details
    Publication Date: 2017-04-04
    Description: We analyzed the spectral amplitude decay with hypocentral distance of P and S waves generated by 76 small magnitude earthquakes (ML 0.9-3.8) located in the Garda region, Central-Eastern Alps, Italy. These events were recorded by 18 stations with velocity sensors, in a distance range between 8 and 120 km. We calculated nonparametric attenuation functions (NAF) and estimated the quality factor Q of both body waves at 17 different frequencies between 2 and 25 Hz. Assuming a homogeneous model we found that the Q frequency dependence of P and S can be approximated with the functions QP=65 f 0.9 and QS=160 f 0.6, respectively. At 2 Hz the QS / QP ratio reaches the highest value of 2.8. At higher frequencies QS/QP varies between 0.7 and 1.7, suggesting that for that frequency band scattering may be an important attenuation mechanism in the region of Garda. To explore the variation of Q with depth, we estimated Q at short (r ≤ 30 km) and intermediate (35-90 km) distance paths. We found that in the shallow crust P waves attenuate more than S (1.3 〈 QS / QP 〈 2.5). Moreover, P waves traveling along paths in the lower crust (depths approximately greater than 30 km) attenuate more than S-waves. To quantify the observed variability of Q with depth we considered a 3-layer model and inverted the NAF to estimate Q in each layer. We found that in the crust Q increases with depth. However, in the upper mantle (~40-50 km depth) Q decreases and in particular the high frequency QS (f〉9 Hz) has values similar to those estimated for the shallow layer of the crust.
    Description: Published
    Description: 1351-1366
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: partially_open
    Keywords: Body-wave attenuation ; Region of Garda, Italy ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 16
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    The occurrence of Mt Barca flank eruption in the evolution of the NW periphery of Etna volcano (Italy) (2008)
    Springer
    Details
    Publication Date: 2017-04-04
    Description: Geological surveys, tephrostratigraphic study, and 40Ar/39Ar age determinations have allowed us to chronologically constrain the geological evolution of the lower NW flank of Etna volcano and to reconstruct the eruptive style of the Mt Barca flank eruption. This peripheral sector of the Mt Etna edifice, corresponding to the upper Simeto valley, was invaded by the Ellittico volcano lava flows between 41 and 29 ka ago when the Mt Barca eruption occurred. The vent of this flank eruption is located at about 15 km away from the summit craters, close to the town of Bronte. The Mt Barca eruption was characterized by a vigorous explosive activity that produced pyroclastic deposits dispersed eastward and minor effusive activity with the emission of a 1.1-km-long lava flow. Explosive activity was characterized by a phreatomagmatic phase followed by a magmatic one. The geological setting of this peripheral sector of the volcano favors the interaction between the rising magma and the shallow groundwater hosted in the volcanic pile resting on the impermeable sedimentary basement. This process produced phreatomagmatic activity in the first phase of the eruption, forming a pyroclastic fall deposit made of high-density, poorly vesicular scoria lapilli and lithic clasts. Conversely, during the second phase, a typical strombolian fall deposit formed. In terms of hazard assessment, the possible occurrence of this type of highly explosive flank eruption, at lower elevation in the densely inhabited areas, increases the volcanic risk in the Etnean region and widens the already known hazard scenario.
    Description: INGV-DPC V3_6 project UR V3_6/07
    Description: In press
    Description: on line first
    Description: 3.5. Geologia e storia dei sistemi vulcanici
    Description: JCR Journal
    Description: reserved
    Keywords: Etna volcano ; unconformity ; tephostratigraphy ; 40Ar/39Ar age determination ; 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 17
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    Observaciones sobre la distribución vertical y caracterización de los registros ecoicos de algunas especies de peces costeros en la plataforma bonaerense. November 1994 (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Acoustic data were recorded by means of a scientific echosounder, during a survey carried out with R/V Dr. E.L.Holmberg in the coastal region off Buenos Aires, Argentina. Data were obtained in correlation with bottom trawl stations, aiming at characterizing the echo recording of several coastal fish species. Echo recording of the following species could be identified: white croaker Micropogonias furnieri, striped weakfish Cynoscion striatus, horse mackerel Trachurus lathami and red porgy Sparus pagrus. From these, some aspects of fish behaviour are described.In situ target strength measurements were taken with a split-beam transducer for striped weak fish, obtaining mean values of -43.9 dB and -42.9 dB for fish with mean length 17.0 cm and 18.5 cm respectively.
    Description: Lasta, C.A., ed. 1998. Resultados de una campaña de evaluación de recursos demersales costeros de la Provincia de Buenos Aires y del litoral Uruguayo. Noviembre, 1994.INIDEP Informe Técnico.21: 141 p.
    Description: Published
    Keywords: Echosounding ; Coastal fisheries ; Echo surveys ; Marine fish ; Echosounding ; Vertical distribution ; Coastal fisheries
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 18
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    La caballa (Scomber japonicus) y las condiciones ambientales en el area bonaerense de El Rincón (39°- 40°30' S), agosto 1996. (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: In August 1996 acoustic methods were employed to estimate mackerel (Scomber japonicus) abundance in the Buenos Aires, Argentina shelf area of "El Rincón" (4,287 mn2), located between 39°- 40° 30' S. Results showed a biomass estimate of 77,260 t. ASIMRAD EK-500 equipment operated with a 38 KHz split-beam transducer was used. Midwater fishing trawls were employed to identify echotraces and to collect mackerel samples.Trawls 4 and 5 were the most successful. Samples included only adult fish (310-470 mm Lt and ages ranging 2-11). Length and weight growth parameters and mortality rates were estimated. Analysis of the stomach contents revealed that mackerel was feeding exclusively on zooplankters over 2 mmlength. The analysis of the characteristics (dimensions and density) of the mackerel shoals allowed to detect two areas of concentration above and below 40°S latitude. The northern area was characterized by relatively small schools of medium density similar to those of the Mar del Plata area. In the southern zone, large schools of high density that account for almost 92 of the total biomass were found.Differences between both areas were also detected when plankton distribution was analyzed. Higher abundances of the dinoflagellate Alexandrium tamarense corresponded to the southern area. On the contrary, higher zooplankton biomass was detected northerly of 40°S. From an oceanographic standpoint, the presence of mackerel was associated to relatively higher salinity values. As a result of the different data analyzed it is suggested that,during this time of the year, the species shows a migratory pattern from the intermediate shelf to coastal areas.
    Description: Publisher permission
    Description: Published
    Description: Scombridae, Scomber japonicus, caballa, zooplancton, relevamientos ecoicos, condiciones ambientales, biomasa, abundancia, estructura poblacional
    Keywords: Biomass ; Population structure ; Zooplankton ; Environmental conditions ; Abundance ; Biomass ; Population structure ; Zooplankton ; Environmental conditions ; Echo surveys
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 19
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    La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 (2008)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: Between September 1st and 6th a research cruise was carried out in the Buenos Aires shelf area of "El Rincon" 39°40'-41°30'S, Argentine Sea SW Atlantic. The total area studied was 2,527.8 nautical mile2. Knowledge of the commercial fleet location at the time of the survey allowed to intensify sampling in a 'miniarea' of 52,8 nautical mile2. The acoustic assessment of chub mackerel (Scomber japonicus) biomass was 49,511.9 t, 94 of which corresponded to this last area. Fish samples coming from fishing trawls included only adult individuals of 240-460 mm total length (TL) and ages ranging 2-11 years. The limit age was estimated at 13 years and natural and total mortality rates at 0.23 and 0.54, respectively. Oceanographic conditions were those typical of the winter season, characterized by the vertical homogeneity of the water column in temperature and salinity. The isotherms and isohalines distributed parallel to the 50 m isobath with values progressively decreasing from the coast towards the slope. Salinity values allowed to detect two hydrographic regimes: that of the San Matias Gulf 33.8-34.4 located to the West and covering more than half of the study area and the one of the Shelf Waters 33.5-33.79 occurring towards the East. A positive gradient in chlorophyll a concentration was observed in N-S sense and from the coast towards the shelf break. The highest densities of phytoplankton, with dominance of diatoms, were observed in the southern sector. Low concentrations of Alexandrium tamarense and Prorocentrum minimum, two potentially noxious dinoflagellates, were detected. The highest zooplankton biomass associated to the highest salinity values and salinity gradients, represented mostly by Calanoides cf. carinatus, was also detected in the southern sector. The western sector, influenced by the San Matias Gulf regime and characterized by high densities of both, phytoplankton and zooplankton, may constitute a potentially favourable feeding ground for chub mackerel.
    Description: Publisher permission
    Description: Published
    Description: Scombridae, Scomber japonicus, caballa
    Keywords: Fishery oceanography ; Biomass ; Environmental conditions ; Population characteristics ; Echo surveys ; Mackerel fisheries ; Fishery oceanography ; Biomass ; Environmental conditions
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 20
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    Antisera induced by infusions of autologous Ad-CD154-leukemia B cells identify ROR1 as an oncofetal antigen and receptor for Wnt5a (2008)
    National Academy of Sciences
    Details
    Publication Date: 2008-02-19
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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