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  • Wiley-Blackwell  (284)
  • Nürnberg: Institut für Arbeitsmarkt- und Berufsforschung (IAB)
  • Copernicus
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  • 1
    Electronic Resource
    Electronic Resource
    Regiospecific Hydroxylation of Metallodisilanes of the Iron Group - An Impressive Example of the Transition Metal Effect (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1585-1587 
    Details
    ISSN: 1434-1948
    Keywords: Metallodisilanes ; Oxofunctionalization ; Metallodisilandiols ; Silanetriols ; Metallosiloxanes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of the ferriodisilanes C5R5(OC)2Fe-Si2H5 [R = H (1a), Me (1b)] with dimethyldioxirane leads to selective insertion of oxygen into the α-Si-H bonds to yield the ferriodihydroxydisilanes C5R5(OC)2Fe-Si(OH)2-SiH3[R = H (2a), Me (2b)]. Another access to yield 2a is opened by hydrolysis of the dichloro(ferrio)disilane Cp(OC)2Fe-SiCl2-SiH3 (3a). Treatment of the pentachloro(metallo)disilanes C5H5(OC)2Fe-Si2Cl5 (4a) and C5Me5(OC)2Ru-Si2Cl5 (4b) with water results in regiospecific hydroxylation of the β-silicon atom to generate metallodisilanetriols C5R5(OC)2M-SiCl2-Si(OH)3 [M = Fe, R = H (5a); M = Ru, R = Me (5b)]. Controlled condensation of 5b with Me2Si(H)Cl leads to the novel rutheniosiloxane C5Me5(OC)2Ru-SiCl2-Si(OSiMe2H)3 (6).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Phenotypic expression of mouse isoantigens (1962)
    Philadelphia : Wiley-Blackwell
    Journal of Cellular and Comparative Physiology 60 (1962), S. 107-128 
    Details
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1030600410
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  • 3
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    Modulation of glacier ablation by tephra coverage from Eyjafjallajökull and Grimsvötn volcanoes, Iceland: an automated field experiment (2017)
    Copernicus
    Details
    Publication Date: 2017-07-06
    Description: This Article reports results from a field experiment investigating the influence of volcanic tephra coverage on glacier ablation. These influences are known to be significantly different from those of moraine debris on glaciers due to the contrasting grain size distribution and thermal conductivity. Influences of tephra deposits on glacier ablation have hardly been studied so far. For the experiment, artificial plots of two different tephra types from Eyjafjallajökull and Grimsvötn volcanoes were installed on a snow-covered glacier surface of Vatnajökull ice cap, Iceland.Ablation was automatically monitored along with atmospheric variables and ablation on a non-tephra covered reference site over the summer season 2015. For each of the two volcanic tephra types, three plots (~ 1.5 mm, ~ 8.5 mm and ~ 80 mm) were monitored. After limiting the records to a period of reliable measurements, a 50-days dataset of hourly records was obtained, which can be downloaded from the Pangaea data repository (https://www.pangaea.de; https://doi.org/10.1594/PANGAEA.876656). The experiment shows a substantial increase of ablation under the ~ 1.5 mm and ~ 8.5 mm tephra plots when compared to uncovered conditions. Only under the thick tephra cover some insulating effects could be observed. This result is in contrast to other studies which depicted insulating effects for much thinner tephra coverson bare-ice glacier surfaces. Differences between the influences of the two different petrological types of tephra exist but are small.
    Electronic ISSN: 1866-3591
    Topics: Geosciences
    Published by Copernicus
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  • 4
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    Modulation of glacier ablation by tephra coverage from Eyjafjallajökull and Grímsvötn volcanoes, Iceland: an automated field experiment (2018)
    Copernicus
    Details
    Publication Date: 2018-01-10
    Description: We report results from a field experiment investigating the influence of volcanic tephra coverage on glacier ablation. These influences are known to be significantly different from those of moraine debris on glaciers due to the contrasting grain size distribution and thermal conductivity. Thus far, the influences of tephra deposits on glacier ablation have rarely been studied. For the experiment, artificial plots of two different tephra types from Eyjafjallajökull and Grímsvötn volcanoes were installed on a snow-covered glacier surface of Vatnajökull ice cap, Iceland. Snow-surface lowering and atmospheric conditions were monitored in summer 2015 and compared to a tephra-free reference site. For each of the two volcanic tephra types, three plots of variable thickness (∼ 1.5, ∼ 8.5 and ∼ 80 mm) were monitored. After limiting the records to a period of reliable measurements, a 50-day data set of hourly records was obtained, which can be downloaded from the Pangaea data repository (https://www.pangaea.de; doi:10.1594/PANGAEA.876656). The experiment shows a substantial increase in snow-surface lowering rates under the ∼ 1.5 and ∼ 8.5 mm tephra plots when compared to uncovered conditions. Under the thick tephra cover some insulating effects could be observed. These results are in contrast to other studies which depicted insulating effects for much thinner tephra coverage on bare-ice glacier surfaces. Differences between the influences of the two different petrological types of tephra exist but are negligible compared to the effect of tephra coverage overall.
    Print ISSN: 1866-3508
    Electronic ISSN: 1866-3516
    Topics: Geosciences
    Published by Copernicus
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  • 5
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    Snow cover variability across glaciers in Nordenskiöldland (Svalbard) from point measurements in 2014–2016 (2019)
    Copernicus
    Details
    Publication Date: 2019-01-02
    Description: Snow depths and bulk densities of the annual snow layer were measured at 69 different locations on glaciers across Nordenskiöldland, Svalbard, during the spring seasons of the period 2014–2016. Sampling locations lie along nine transects extending over 17 individual glaciers. Several of the locations were visited repeatedly, leading to a total of 109 point measurements, on which we report in this study. Snow water equivalents were calculated for each point measurement. In the dataset, snow depth and density measurements are accompanied by appropriate uncertainties which are rigorously transferred to the calculated snow water equivalents using a straightforward Monte Carlo simulation-style procedure. The final dataset can be downloaded from the Pangaea data repository (https://www.pangaea.de; https://doi.org/10.1594/PANGAEA.896581). Snow cover data indicate a general and statistically significant increase of snow depths and water equivalents with terrain elevation. A significant increase of both quantities with decreasing distance towards the east coast of Nordenskiöldland is also evident, but shows distinct interannual variability. Snow density does not show any characteristic spatial pattern.
    Electronic ISSN: 1866-3591
    Topics: Geosciences
    Published by Copernicus
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  • 6
    Electronic Resource
    Electronic Resource
    Crosslinkable polar siloxane copolymers for ion detection devices (1994)
    Weinheim : Wiley-Blackwell
    Advanced Materials 6 (1994), S. 944-947 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19940061209
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  • 7
    Electronic Resource
    Electronic Resource
    2,3-Donor-Acceptor-Substituted 1,3-Butadienes. Synthesis by SO2-extrusion from 3-sulfolenes and diels-alder reactions (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 343-349 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal extrusion of SO2 from disubstituted 3-sulfolenes 3 leads to 2,3-donor-acceptor-substituted 1,3-butadienes 4. These dienes react with acrylic acid ester and ethyl vinyl ether to the corresponding Diels-Alder adducts 5 and 6 and with themselves to the cyclic dimerization products 7 and 8. The regiochemistry of the cycloadducts has been determined by chemical- and NMR-methods.The pyrolysis of 3-sulfolene 11 afforded the thiolactone 13 whose structure has been verified by X-ray diffraction analysis. In addition, the influence of Lewis acid catalysts on the Diels-Alder reaction and an approach to transition state calculation by means of the semiempirical AM 1 method has also been investigated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360413
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  • 8
    Electronic Resource
    Electronic Resource
    Einfluß von Schwefel auf die Aufkohlung einer CrNiFe-Legierung bei hohen Temperaturen (1979)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 794-799 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of sulphur on the carburization of a CrNiFe-alloy at high temperaturesGravimetric investigations at 900, 1000 and 1100°C have been performed on the corrosion of Incoloy 800 (X 40 CrNi 21 32) in CH4-H2-H2S mixtures at the carbon activity aC = 1 and with varied ratios: 10-6 〈 H2S/H2 〈 10-3. The carburization and internal carbide formation is increasingly retarded with increasing ratio H2S/H2 up to the stability limit of CrS, where sulfidation starts and carburization begins anew. The retardation of the carburization is caused by adsorbed sulphur, blocking the metallic surface for the carbon transfer from the gas phase. Selenium and tellurium also are inhibitors for the carburization. With the optimum H2S/H2-ratio experiments have been performed at aC 〉 1, in which the graphite formation on the metallic surface was suppressed effectively. The application of these effects for inhibiting carburization is discussed.
    Notes: In gravimetrischen Versuchen bei 900, 1000 und 1100°C wurde die Korrosion von Incoloy 800 (X 40 CrNi 21 32) in CH4-H2-H2S Gemischen bei der Kohlenstoffaktivität aC = 1 und variiertem H2S/H2-Verhältnis 10-6 〈 H2S/H2 〈 10-3 gemessen Mit steigendem Verhältnis H2S/H2 wird zunehmend die Aufkohlung und innere Carbidbildung unterdrückt, bis oberhalb der Stabilitätsgrenze des CrS Sulfidierung und erneut Aufkohlung einsetzt. Die Hemmung der Aufkohlung ist auf adsorbierten Schwefel zurückzuführen, der die metallische Oberfläche für die Kohlenstoffübertragung aus der Gasphase blockiert. Selen und Tellur haben ebenfalls eine inhibierende Wirkung auf die Aufkohlung. Bei optimaler Einstellung des H2S/H2-Verhältnisses wurden Versuche mit aC 〉 1 durchgeführt. Hierbei zeigte sich, daß der adsorbierte Schwefel auch wirkungsvoll die Graphitabscheidung unterdrückt. Die Anwendung dieser Effekte für die Inhibierung der Aufkohlung wird diskutiert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19790301104
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  • 9
    Electronic Resource
    Electronic Resource
    Einflüsse von Legierungselementen auf die Korrosion und Wasserstoffaufnahme von Eisen in Schwefelsäure - Teil II: Korrosion und DeckschichtbildungHerrn Professor Dr. rer. nat. Hans-Jürgen Engell zum 60. Geburtstag gewidmet (1985)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 447-454 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Effects of Alloying Elements on Corrosion and Hydrogen Uptake of Iron in Sulfuric Acid Part II: Corrosion and Formation of Surface LayersThe effects of C, S, P, Mn, Si, Cr, Ni, Sn and Cu on the formation of surface layer and hydrogen uptake of iron during corrosion in 1 M H2SO4/N2 were investigated using AES, XPS, SEM and electrochemical permeation techniques.Cu, Sn, P and C are enriched on the surface of iron during corrosion in H2SO4. Cu is enriched in the metallic form. P forms a phosphate and phosphide containing surface layer. Ni is not enriched. Cr is preferentially dissolved. Cu, Sn and Ni inhibit the dissolution of iron and thus decrease the hydrogen activity. S, P and Mn (MnS) increase the corrosion and hydrogen activity. Cr forms traps in iron which increase the hydrogen uptake.
    Notes: Die Einflüsse von C, S, P, Mn, Si, Cr, Ni, Sn und Cu auf Deckschichtbildung und Wasserstoffaufnahme bei Korrosion von Eisen in 1 M H2SO4/N2 wurden mit AES, XPS, REM sowie der elektrochemischen Permeationsmethode untersucht.Cu, Sn, P und C reichern sich bei Korrosion von Eisen in H2SO4 an der Oberfläche an. Cu bleibt metallisch liegen. P bildet eine phosphat-und phosphidhaltige Deckschicht. Ni reichert sich nicht an. Cr geht bevorzugt in Lösung. Cu, Sn und Ni hemmen die Eisenauflösung und erniedrigen die Wasserstoffaktivität. S, P und Mn (MnS) erhöhen die Korrosionsgeschwindigkeit und die Wasserstoffaktivität. Cr bildet Wasserstoffallen in Eisen, die die Wasserstoffaufnahme erhöhen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19850361004
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  • 10
    Electronic Resource
    Electronic Resource
    Noble metal loaded block lonomers: micelle organization, adsorption of free chains and formation of thin films**This work was supported by the the Deutsche Forschungsgemeinschaft (SFB 239) and by a grant of the European Community (Human Capital and Mobility, Project: Synthetic Electronic Materials). One of us (AR) gratefully acknowledges support by the Stichting Technische Wetenschappen, Netherlands. (1995)
    Weinheim : Wiley-Blackwell
    Advanced Materials 7 (1995), S. 731-735 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19950070811
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