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  • Springer Nature  (51,092)
  • Cell Press  (10,891)
  • Wiley-Blackwell
  • 2015-2019  (58,882)
  • 1950-1954  (5,142)
  • 2016  (58,882)
  • 1951  (5,142)
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  • 2015-2019  (58,882)
  • 1950-1954  (5,142)
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  • 1
    Publication Date: 2021-06-14
    Description: This study is focused on the (micro)biogeochemical features of two close geothermal sites (FAV1 and FAV2), both selected at the main exhalative area of Pantelleria Island, Italy. A previous biogeochemical survey revealed high CH4 consumption and the presence of a diverse community of methanotrophs at FAV2 site, whereas the close site FAV1 was apparently devoid of methanotrophs and recorded no CH4 consumption. Next-Generation Sequencing (NGS) techniques were applied to describe the bacterial and archaeal communities which have been linked to the physicochemical conditions and the geothermal sources of energy available at the two sites. Both sites are dominated by Bacteria and host a negligible component of ammonia-oxidizing Archaea (phylum Thaumarchaeota). The FAV2 bacterial community is characterized by an extraordinary diversity of methanotrophs, with 40% of the sequences assigned to Methylocaldum, Methylobacter (Gammaproteobacteria) and Bejerickia (Alphaproteobacteria); conversely, a community of thermo-acidophilic chemolithotrophs (Acidithiobacillus, Nitrosococcus) or putative chemolithotrophs (Ktedonobacter) dominates the FAV1 community, in the absence of methanotrophs. Since physical andchemical factors of FAV1, such as temperature and pH, cannot be considered limiting for methanotrophy, it is hypothesized that the main limiting factor for methanotrophs could be high NH4+ concentration. At the same time, abundant availability of NH4+ and other high energy electron donors and acceptors determined by the hydrothermal flux in this site create more energetically favourable conditions for chemolithotrophs that outcompete methanotrophs in non-nitrogen-limited soils.
    Description: Published
    Description: 150–162
    Description: 4V. Vulcani e ambiente
    Description: JCR Journal
    Description: restricted
    Keywords: geothermal soils ; geomicrobiology ; chemolithotrophs ; methanotrophs ; Pantelleria ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2021-04-07
    Description: Stable isotopes were measured in the carbonate and organic matter of palaeosols in the Somma–Vesuvius area, southern Italy in order to test whether they are suitable proxy records for climatic and ecological changes in this area during the past 18000 yr. The ages of the soils span from ca. 18 to ca. 3 kyr BP. Surprisingly, the Last Glacial to Holocene climate transition was not accompanied by significant change in d18O of pedogenic carbonate. This could be explained by changes in evaporation rate and in isotope fractionation between water and precipitated carbonate with temperature, which counterbalanced the expected change in isotope composition of meteoric water. Because of the rise in temperature and humidity and the progressive increase in tree cover during the Holocene, the Holocene soil carbonates closely reflect the isotopic composition of meteoric water. A cooling of about 2°C after the Avellino eruption (3.8 ka) accounts for a sudden decrease of about 1‰ in d18O of pedogenic carbonate recorded after this eruption. The d13C values of organic matter and pedogenic carbonate covary, indicating an effective isotope equilibrium between the organic matter, as the source of CO2, and the pedogenic carbonate. Carbon isotopes suggest prevailing C3 vegetation and negligible mixing with volcanogenic or atmospheric CO2.
    Description: Published
    Description: 813-824
    Description: 1V. Storia e struttura dei sistemi vulcanici
    Description: JCR Journal
    Description: restricted
    Keywords: stable isotope ; palaeosols ; Somma–Vesuvius ; palaeoclimate ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 3
    Publication Date: 2016-12-16
    Description: Slope failure like in the Hinlopen/Yermak Megaslide is one of the major geohazards in a changing Arctic environment. We analysed hydroacoustic and 2D high-resolution seismic data from the apparently intact continental slope immediately north of the Hinlopen/Yermak Megaslide for signs of past and future instabilities. Our new bathymetry and seismic data show clear evidence for incipient slope instability. Minor slide deposits and an internally-deformed sedimentary layer near the base of the gas hydrate stability zone imply an incomplete failure event, most probably about 30000 years ago, contemporaneous to or shortly after the Hinlopen/Yermak Megaslide. An active gas reservoir at the base of the gas hydrate stability zone demonstrate that over-pressured fluids might have played a key role in the initiation of slope failure at the studied slope, but more importantly also for the giant HYM slope failure. To date, it is not clear, if the studied slope is fully preconditioned to fail completely in future or if it might be slowly deforming and creeping at present. We detected widespread methane seepage on the adjacent shallow shelf areas not sealed by gas hydrates.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Publication Date: 2017-07-05
    Description: Little is known about the production of fluorescent dissolved organic matter (FDOM) in the anoxic oceanic sediments. In this study, sediment pore waters were sampled from four different sites in the Chukchi-East Siberian Seas area to examine the bulk dissolved organic carbon (DOC) and their optical properties. The production of FDOM, coupled with the increase of nutrients, was observed above the sulfate-methane-transition-zone (SMTZ). The presence of FDOM was concurrent with sulfate reduction and increased alkalinity (R2 〉 0.96, p 〈 0.0001), suggesting a link to organic matter degradation. This inference was supported by the positive correlation (R2 〉 0.95, p 〈 0.0001) between the net production of FDOM and the modeled degradation rates of particulate organic carbon sulfate reduction. The production of FDOM was more pronounced in a shallow shelf site S1 with a total net production ranging from 17.9 to 62.3 RU for different FDOM components above the SMTZ depth of ca. 4.1 mbsf, which presumably underwent more accumulation of particulate organic matter than the other three deeper sites. The sediments were generally found to be the sources of CDOM and FDOM to the overlying water column, unearthing a channel of generally bio-refractory and pre-aged DOM to the oceans.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
    Publication Date: 2017-04-04
    Description: We present a strategy to thoroughly investigate the effects of prominent topography on the surface tilt due to a spherical pressure source. We use Etna's topography as a case of study and, for different source positions, we compare the tilt fields calculated through (i) a 3-D boundary element method and (ii) analytical half-space solutions. We systematically determine (i) the source positions leading to the strongest tilt misfits when numerical and analytical results are compared and (ii) the surface areas where the strongest distortions in the tilt field are most likely to be observed. We also demonstrate that, under critical circumstances, in terms of respective positions of pressure source and observation points, results of inversion procedures aimed at retrieving the source parameters can be misleading, if tilt data are analysed using models that do not account for topography.
    Description: Published
    Description: 1471–1481
    Description: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Description: JCR Journal
    Description: restricted
    Keywords: Numerical approximations and analysis ; Transient deformation ; Volcano monitoring ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 6
    Publication Date: 2020-02-05
    Description: In this paper, we present a method for handling uncertainties in the determination of the source parameters of earthquakes from spectral data. We propose a robust framework for estimating earthquake source parameters and relative uncertainties, which are propagated down to the estimation of basic seismic parameters of interest such as the seismic moment, the moment magnitude, the source size and the static stress drop. In practice, we put together a Bayesian approach for model parameter estimation and a weighted statistical mixing of multiple solutions obtained from a network of instruments, providing a useful framework for extracting meaningful data from intrinsically uncertain data sets. The Bayesian approach used to estimate the source spectra parameters is a simple but powerful mechanism for non-linear model fitting, providing also the opportunity to naturally propagate uncertainties and to assess the quality and uniqueness of the solution. Another important added value of such an approach is the possibility of integrating information from the expertise of seismologists. Such data can be encoded in a prior state of information that is then updated with the information provided by seismological data. The performance of the proposed approach is demonstrated analysing data from the 1909 April 23 earthquake occurred near Benavente (Portugal).
    Description: Published
    Description: 691-701
    Description: 2T. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Fourier analysis ; Probability distributions ; Earthquake source observations ; Seismicity and tectonics ; 04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
    Publication Date: 2022-05-24
    Description: Pico, the youngest island of the Azores Archipelago (Portugal), is characterized by a central volcano and a 30-km-long fissure zone. Its eruption rate is the highest of the Azores islands, with more than 35 eruptions in the last 2000 years. Here, we estimate the lava-flow hazard for Pico Island by combining the vent opening probability derived from the spatial distribution of eruptive fissures, the classes of expected eruptions inferred from the physical and chemical characteristics of historical eruptions, and the lava-flow paths simulated by the MAGFLOW model. The most likely area to host new eruptions is along a WNW–ESE trend centred on the central volcano, with the highest hazard affecting the two main residential zones of Lajes do Pico and Madalena. Our analysis is the first attempt to assess the lava-flow hazard for Pico Island, and may have important implications for decision-making in territorial management and future land-use planning.
    Description: Published
    Description: 156-161
    Description: 3V. Dinamiche e scenari eruttivi
    Description: JCR Journal
    Description: restricted
    Keywords: lava flow hazard ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
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  • 8
    Publication Date: 2022-05-24
    Description: This study investigates in detail the deformation events that have affected the sedimentary successions forming the substrate of Mt. Etna volcano (Italy). Based on the geometric reconstruction of a buried sedimentary marker, we have been able to identify and quantify the effects of three different mechanisms of deformation that have affected the area in the last 600 ka. Numerical results from Finite Element Method (FEM) applied to model viscoelastic deformation suggest the occurrence of a crustal doming process originating at the mantle-crust transition (~16 km). We propose that the source of deformation is related to the diapiric uprise of hydrothermal material originating in altered ocean-like crust and its emplacement at a shallower level in the crust. This process has great relevance in the volcanic system and should be considered for the full assessment of its origin and evolution.
    Description: Published
    Description: 338 – 345
    Description: 4V. Vulcani e ambiente
    Description: JCR Journal
    Description: restricted
    Keywords: volcanic doming ; viscoelastic modeling ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
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  • 9
    Publication Date: 2023-09-22
    Description: Effects of temperature changes on phytoplankton communities seem to be highly context-specific, but few studies have analyzed whether this context specificity depends on differences in the abiotic conditions or in species composition between studies. We present an experiment that allows disentangling the contribution of abiotic and biotic differences in shaping the response to two aspects of temperature change: permanent increase of mean temperature versus pulse disturbance in form of a heat wave. We used natural communities from six different sites of a floodplain system as well as artificially mixed communities from laboratory cultures and grew both, artificial and natural communities, in water from the six different floodplain lakes (sites). All 12 contexts (2 communities × 6 sites) were first exposed to three different temperature levels (12, 18, 24 °C, respectively) and afterward to temperature pulses (4 °C increase for 7 h day(-1)). Temperature-dependent changes in biomass and community composition depended on the initial composition of phytoplankton communities. Abiotic conditions had a major effect on biomass of phytoplankton communities exposed to different temperature conditions, however, the effect of biotic and abiotic conditions together was even more pronounced. Additionally, phytoplankton community responses to pulse temperature effects depended on the warming history. By disentangling abiotic and biotic effects, our study shows that temperature-dependent effects on phytoplankton communities depend on both, biotic and abiotic constraints.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 10
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 23 (1951) 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 11
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die im folgenden erörterten Fragen sind nicht nur deswegen Grenzprobleme, weil es sich bei ihnen um Transportvorgänge durch Phasengrenzen handelt. Vielmehr bildet dieses Gebiet auch eine Berührungsgrenze zwischen den Ingenieurwissenschaften und der physikalischen Chemie. Von erstgenannter Seite wurde der betreffende Fragenkreis in letzter Zeit mehrfach zusammenfassend dargestellt1. Hier möge er mehr vom Standpunkt der physikalischen Chemie aus und unter Bevorzugung der bisher noch nicht befriedigend gelösten Probleme behandelt werden. Gerade dieses Gebiet ist besonders geeignet, die Fruchtbarkeit einer Zusammenarbeit beider Wissenschaften im Rahmen der Verfahrenstechnik aufzuzeigen.
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  • 12
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 21-22 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 13
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 23-24 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 14
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 24-24 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 15
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 27-27 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 16
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 24-25 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 17
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 28-32 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 18
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 57-58 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Verwendung von Spezialgraphit hat bei Absorbern und Verbrennungsöfen für die Chlorwasserstoff-Synthese zu wesentlich leistungsfähigeren und raumsparenden Konstruktionen geführt, über die nachfolgend berichtet wird.
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  • 19
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 59-64 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die bisher vorliegenden Meßergebnisse für die Wärmeleitfähigkeit der wäßrigen Lösungen von Salzen, Säuren und Basen werden kritisch verglichen und in einheitlicher Form dargestellt. Auf Grund einfacher theoretischer Betrachtungen ist es möglich, diese wichtige Größe für zahlreiche noch nicht untersuchte Lösungen zuverlässig abzuschätzen.
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  • 20
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 68-68 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 21
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 68-72 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
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  • 22
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 73-75 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 23
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 72-72 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 24
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 75-76 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 25
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 72-72 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 26
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    Chemie Ingenieur Technik - CIT 23 (1951) 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 27
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 76-80 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 28
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 111-111 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 29
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 112-113 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Im Laufe von Untersuchungen über die Phasengleichgewichte in ternären und polynären Systemen war es notwendig, die Löslichkeit von Kohlenwasserstoffen in Methyl- und Benzylalkohol zu untersuchen. Außer Gesichtspunkten allgemeiner Natur spielte bei dieser Arbeit auch die Erwägung eine Rolle, gegebenenfalls neue analytische und präparative Möglichkeiten zu gewinnen.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 113-115 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Um die Fragen nach dem Kältebedarf und der zweckmäßigsten Soletemperatur bei der Ausrüstung von Kunstfaserfabriken mit Kältemaschinenanlagen zu klären, wurden Untersuchungen an Xanthatknetern durchgeführt, über die nachstehend berichtet wird.
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  • 31
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An zahlreichen Beispielen wird gezeigt, daß die Normung in der Verfahrenstechnik und im Apparatebau sich nicht allein auf Größe und Form von Flanschen, Rohren, Nieten und anderen Maschinenelementen beschränken darf, sondern daß sie zweckmäßigerweise auch ganze Apparaturen umfassen sollte.
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  • 32
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 116-117 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 120-120 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 120-120 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 35
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 139-141 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 36
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 141-141 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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  • 37
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bei dem in der vorliegenden Arbeit erstmalig gelösten Festigkeitsproblem handelt es sich um Fragen, die bei der Berechnung solcher Hochdruckrohre von Bedeutung sind, die im Gegensatz zu den bisher verwendeten geschmiedeten Massivrohren aus einem dünnwandigen Kernrohr bestehen, auf das  -  je nach der Höhe des Innendrucks  -  eine mehr oder weniger große Zahl von Bändern aufgewickelt wird. Außerdem spielt das Problem auch bei anders gearteten Aufgaben eine Rolle, auf die kurz hingewiesen wird.
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  • 38
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    Chemie Ingenieur Technik - CIT 23 (1951) 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 147-152 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 157-160 
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    Notes: Bei Vollschmierung ist die Temperaturabhängigkeit der Viscosität von großer Bedeutung, für deren Charakterisierung besondere Kennziffer-Systeme entwickelt wurden. Die gebräuchlichen Systeme versagen jedoch bei sehr niedrigviscosen Flüssigkeiten, bei Ölen mit sehr flacher oder sehr steiler Viscositäts-Temperatur-Kurve und bei Ölen mit hoher Dichte. In diesen Fällen sind die Normalöl-Relation bzw. die Normalöl-Proportion besser geeignet.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 165-165 
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    Notes: Auf Grund der Margulesschen Interpolationsformeln zur Berechnung der Dampfdrucke von Zweistoffgemischen bei konstanter Temperatur wird gezeigt, daß sich ganz allgemein der Trennfaktor als eine Exponentialfunktion mathematisch darstellen läßt. Ihr Exponent ist eine Funktion von Koeffizienten, deren Größe wichtige Schlüsse auf das allgemeine physikalisch-chemische Verhalten von Zweistoffgemischen zu ziehen gestattet. Die mathematische Darstellung läßt sich auch auf die üblichen Gleichgewichtskurven bei konstantem Druck anwenden. Mehrere praktische Beispiele bekannter Kurven werden mathematisch dargestellt.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 171-171 
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    Notes: Versuche über den Wärmeübergang in Rührgefäßen, vor längerer Zeit beim Werk Hoechst der ehemaligen I.G. Farbenindustrie A.G. durchgeführtDie Versuche wurden auf Anregung von Dr.-Ing. S. KießKalt in den Jahren 1935/38 unter Leitung des Verfassers durchgeführt. Die Messungen machten die herren Dipl.-Ing. D. Bachmann, O. Kramer und F. Bieger., werden hier erstmals veröffentlicht und dabei verglichen mit Messungen über den Wärmeübergang an Modellapparaten von Chilton, Drew und Jebens bei der E. J. Du Pont de Nemours u. Comp., Wilmington, Del., sowie von Cummings und West bei der Rohm & Haas Comp., Philadelphia. Das Problem des Wärmeaustausches bei verschiedener Rührerdrehzahl und Temperatur ist nunmehr mit praktisch genügender Genauigkeit gelöst.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 194-194 
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    Notes: Für die Synthese am Eisenkatalysator sind die Art der Inbetriebnahme und die Betriebsbedingungen von ausschlaggebender Bedeutung. Es werden die Probleme der Formierung und der von den Betriebsbedingungen abhängigen Arbeitsweise des Katalysators dargelegt. Für drei der entwickelten Syntheseverfahren werden in zahlenmäßig belegten Beispielen die Ergebnisse und die Betriebsbedingungen mitgeteilt.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 195-196 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 196-200 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 272-276 
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    Notes: Es wurden ein i, s-Diagramm sowie eine Druck- und eine Temperaturtafel für das Sattdampf-Gebiet von Benzol aufgestellt. Berechnungsgrundlagen, Diagramm und Tafeln werden nachstehend wiedergegeben.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 276-278 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 278-278 
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    Notes: Die Kunstfaser-Herstellung beruhte bis zur Mitte der 20iger Jahre dieses Jahrhunderts auf reiner Empirie. Wissenschaftliche Forschungsarbeit von Chemikern und Ingenieuren haben dann aber die Technik der Kunstfaser-Erzeugung teilweise grundlegend geändert. Moderne Kunstfaser-Erzeugungsanlagen kombinieren die ursprünglich zahlreichen einzelnen Arbeitsprozesse zu einem kontinuierlichen Betrieb. Die verfahrenstechnischen wirtschaftlichen Auswirkungen dieser Entwicklung werden dargestellt.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 281-281 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 282-282 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 283-288 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 294-295 
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    Notes: Mittels der Diasolyse lassen sich die Arbeitsverfahren zur Gewinnung von Wirkstoffen aus Pflanzen oder tierischen Produkten bedeutend vereinfachen. Zur Diasolyse im Laboratoriumsmaßstab eignet sich besonders der Diasolyseaufsatz, während die Diasolyseapparatur auch in halbtechnischen und technischen Ausmaßen erstellt werden kann. Zur Vorbehandlung der Ausgangsmaterialien läßt sich der Extraktionsapparat verwenden.
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    Notes: Die nachfolgend abgeleiteten Formeln für den Druckverlust sind von größter Allgemeingültigkeit und lassen sich nicht nur auf alle möglichen Füllkörperformen und -größen, sondern auch auf die verschiedensten Füllkörper- und Schüttgutgemenge übertragen. Die meisten der in der Praxis auftretenden Fälle lassen sich in zwei große Gruppen, und zwar in Säulen mit abgerundeten und mit scharfkantigen Füllkörpern einordnen, für die sich annähernd die gleichen Widerstandsbeiwerte ergeben. Eine Berechnung der Druckverluste ist auch im Falle der Berieselung mit ausreichender Genauigkeit möglich.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 296-298 
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    Notes: Es werden drei Verfahren zur Entsalzung von Meerwasser beschrieben. Das Ausfrieren in Blockzellen mit und ohne Luftbewegung befriedigt nicht. Das Ringzellenverfahren mit temperiertem Schleudern und Abdecken sowie das Rührgefrierverfahren mit Schleudern und Abdecken ergeben befriedigende Salzkonzentrationen von 0,14%, was für Trinkwasserzwecke geeignet ist.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 298-300 
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    Notes: Es wird eine vielstufige, auch zur Verarbeitung größerer Mengen geeignete Verteilungsapparatur beschrieben, die durch große Anpassungsfähigkeit und leichte Zugänglichkeit aller Teile gekennzeichnet ist. Nach der Beschickung arbeitet die Apparatur vollautomatisch, fast ohne Wartung. Sie ist vornehmlich für präparative Zwecke geeignet.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 303-304 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 307-312 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 313-320 
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    Notes: In Analogie zu den Destillations- bzw. Dampflinien der einfachen Destillation werden Rektifikations- bzw. Destillatlinien definiert, welche die Änderung der Zusammensetzung des Destillationsrückstandes (Blaseninhalts) bzw. des Destillats während der Rektifikation homogener Dreistoffgemische angeben. Die Diskussion der Differentialgleichung der Rektifikationslinien für die Umgebung der Eckpunkte des Darstellungsdreiecks und der binären azeotropen Punkte erlaubt die Aufstellung allgemeiner Gesetze, denen die Rektifikationslinienscharen gehorchen. Auf diese Weise läßt sich aus dem Destillationslinienfeld der Charakter des zugehörigen Rektifikationslinienfeldes für ein gegebenes Rücklaufverhältnis und eine gegebene Bodenzahl ableiten. Mit den Rektifikationsdiagrammen lassen sich alle Experimente deuten, die mit wirksamen Kolonnen an z. T. komplizierten Dreistoffgemischen durchgeführt worden sind. Das zeitweilige Sinken der Siedetemperatur des Destillats und andere Erscheinungen, für die es kein Analogon bei Zweistoffgemischen gibt, werden im Rahmen der vorliegenden Theorie verständlich. Eigene Rektifikationsversuche an dem System Methanol-Aceton-Chloroform bestätigen die Richtigkeit der behaupteten Zusammenhänge.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 325-327 
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    Notes: Nach einem Hinweis auf die Bedeutung kontinuierlicher Sauerstoff-Registrierungen in den Betriebswässern von Hochdruckkraftwerken wird eine neue elektrische Sauerstoff-Meßanlage beschrieben, die sich im Kraftwerksbetrieb bei Sauerstoff-Gehalten zwischen 5 und 60 γ/l bereits bewährt hat. Die Umeichung der elektrischen Werte auf γO2/l wird mit der Tolidin-Rhodanid-Methode vorgenommen.
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    Notes: Das beschriebene einfache stabförmige pH-Mcßgerät mit trockener Antimon-Silberchlorid-Kette kann direkt in die Meßflüssigkeit eingetaucht werden. Der pH-Wert ist sofort auf einem technischen Drehspulinstrument abzulesen, das an die Kette ohne weitere Zwischenglieder angeschlossen wird. Die Polarisierbarkeit ist infolge der stark vergrößerten Oberfläche der Silberchlorid-Elektrode nur gering. Es können 15 × 10-6 A zum Betriebe eines technischen Anzeigeinstrumentes dauernd entnommen werden. Einige Anwendungsfälle werden besprochen.
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    Notes: Im folgenden wird vor allem das Warmverformen von Rohren und Rohrverbindungen aus Plexiglas besprochen. Bewährte Anwendungsbeispiele von Plexiglas in der chemischen Industrie werden gezeigt.
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    Notes: Es wird über die praktische Anwendung des bei der BASF von Wolf und Rumpf entwickelten Wirbelsichters berichtet. Die Sichtwirkung wird dabei durch eine ebene spiralförmige Luftströmung erzielt, die rechnerisch genau zu erfassen ist. Die Hauptanwendungsgebiete des Sichters, die Möglichkeiten zur Regelung der Korngrenze sowie die Schwierigkeiten, die durch schlechte Dispergierung mancher Sichtgüter, Verschleiß des Sichters usw. auftreten, werden eingehend besprochen.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 354-355 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 353-354 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 356-360 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 465-469 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Wärmeleitfähigkeit der Gemische von Methyl-, Äthyl-, Normalpropyl- und Isopropylalkohol, Äthylen- und Propylenglykol, Glycerin und Aceton mit Wasser wurde in Abhängigkeit von der Konzentration und Temperatur gemessen. Die Ergebnisse werden in übersichtlichen Tabellen zusammengefaßt und mit den bereits vorliegenden Literaturwerten kritisch verglichen. Die von W. Kraus [10] beobachtete Anomalie im Temperaturverlauf der Wärmeleitfähigkeit von reinem Äthylen- bzw. Propylenglykol konnte nicht bestätigt werden.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 480-481 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 478-478 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 479-480 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 477-478 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 481-481 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 483-488 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 482-482 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 489-490 
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    ISSN: 0009-286X
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Die Vervollkommnung und konstruktive Durchbildung moderner Maschinen verlangt einen wartungsfreien Betrieb der Abdichtungen über eine längere Betriebszeit. Es wird an ausgeführten Beispielen gezeigt, daß nachziehbare Stopfbüchsen mit Erfolg durch selbsttätig arbeitende Federpackungen und Schleifringpackungen ersetzt werden können.
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 494-494 
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 504-505 
    ISSN: 0009-286X
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    Chemie Ingenieur Technik - CIT 23 (1951), S. 502-503 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird ein Aräometer beschrieben, welches gestattet, eine definierte Dichte, etwa d 20/4, bei beliebigen Temperaturen zu messen. Die Steigerung der Empfindlichkeit des Gerätes in Verbindung mit einer Temperaturkompensation ermöglichte eine Genauigkeitssteigerung der aräometrischen Messung, so daß die Pyknometermessung übertroffen wird.
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