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  • Chemistry  (132)
  • Inorganic Chemistry  (14)
  • ASTROPHYSICS  (3)
  • Magnetism
  • 1990-1994  (135)
  • 1
    Electronic Resource
    Electronic Resource
    Physik (1991)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 25 (1991), S. viii 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19910250212
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  • 2
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    Noble gases in twenty Yamato H-chondrites: Comparison with Allan Hills chondrites and modern falls (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Concentration and isotopic composition of noble gases have been measured in 20 H-chrondrites found on the Yamato Mountains ice fields in Antarctica. The distribution of exposure ages as well as of radiogenic He-4 contents is similar to that of H-chrondrites collected at the Allan Hills site. Furthermore, a comparison of the noble gas record of Antarctic H-chrondrites and finds or falls from non-Antarctic areas gives no support to the suggestion that Antarctic H-chrondrites and modern falls derive from differing interplanetary meteorite populations.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 889-890
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    C/O atomic ratios in micrometer-size crushed grains from Antarctic micrometeorites and two carbonaceous meteorites (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Antarctic micrometeorites (AMM's) have similarities (but also differences) with primitive meteorites, such as unequilibrated mineral assemblages. To further assess such similarities, we have measured the carbon content of micrometeorites and meteorites (Orgueil and Murchison), as determined in a random selection of micrometer-size crushed grain, with an analytical transmission electron microscope. Such analyses yield the C/O atomic ratio, the major and minor elements contents, and the textural features of the grains on a scale of approx. equal to 100 nanometers. An important proportion of micrometeorites from both the 100-400 micron and the 50-100 micron size fractions contains much more carbon than CI chondrite Orgueil. The average C-content of all micrometeorites in these two size fractions amount to approximately 1.8 x CI, and approximately 0.8 x CI, respectively (CI refers to the bulk C-content of Orgueil, of about 3.5 percent by weight). Carbon is usually not homogeneously distributed in the micrometeorite but is concentrated in C-rich grains. So far, most of these grains are amorphous, and seem to be associated with an oxidized Fe-rich phase (possibly a variety of 'dirty' magnetite). About 5 percent of them have the composition of 'COPS', a phase additionally enriched in O, P, and S.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1125-1126
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Multi-wavelength study of NGC 281 A (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present a study of the molecular cloud NGC 281 A and the associated compact and young star cluster NGC 281 (AS 179). Optical photometry leads to a new distance of 3500 pc for the star cluster which is in good agreement with the kinematical distance of the adjacent molecular cloud NGC 281 A. The exciting star HD 5005 of the optical nebulosity is a Trapezium system with O6 III as photometric spectral type for the component HD 5005 AB. For the age of the star cluster we estimated a value of about 3 x 10(exp 6) yr. The (12)CO (2 to 1), (13)CO (2 to 1), and (12)CO (3 to 2) emission shows that the molecular cloud NGC 281 A consists of two cloud fragments. The western fragment is more compact and massive than the eastern fragment and contains an NH3 core. This core is associated with the IRAS source 00494+5617, an H2O maser, and 1.3 millimeter dust continuum radiation. Both cloud fragments contain altogether 22 IRAS point sources which mostly share the properties of young stellar objects. They have luminosities between 150 and 8800 solar luminosity. The maxima of the 60 and 100 micrometers HIRES maps correspond to the maxima of the (12)CO (3 to 2) emission. The NGC 281 A region shares many properties with the Orion Trapezium-BN/KL region the main differences being a larger separation between the cluster centroid and the new site of star formation as well as a lower mass and luminosity of the molecular cloud and the infrared cluster.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 288; 1; p. 282-292
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    W. G. Jennings, J. G. Nikelly (Hrsg.): Capillary Chromatography - The Applications. Erste Auflage, 153 S., 54 Abb., 29 Tab., Hüthig Buchverlag GmbH, Heidelberg 1991. Chromatographic Methods. Hardcover. 88, - DM (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 194-194 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340221
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  • 6
    Electronic Resource
    Electronic Resource
    Elektrochemischer Detektor mit einer Kohlefaserbündel-Arbeitselektrode für die HPLCHerrn Prof. Dr. Rolf Borsdorf zum 60. Geburtstag gewidmet (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 49-52 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: HPLC-Electrochemical Detector with a Carbon Fiber Working ElectrodeThe paper describes an electrochemical detector with carbon fibers as the working electrode placed perpendicularly to the flow direction. The detector performance was characterized by the detection limit for selected phenolic compounds, reproducibility, linearity and the signal dependence on the flow rate. An electrochemical in situ pretreatment of the working electrode improves sensitivity and long term stability.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340109
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  • 7
    Electronic Resource
    Electronic Resource
    Das Alitieren von Stählen als Schutz gegen die Hochtemperatursulfidierung in Schwefel und in H2S-haltigen GasenAuszug aus der Dissertation Th. Uihlein [1]; Universität Erlangen-Nürnberg, 1988. (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 585-599 
    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: Aluminizing of steels for protection against high-temperature sulphidation in liquid sulphur and in H2S-containing atmospheresThe aluminizing of a structural steel (Werkst. Nr. 1.7335), a stainless steel (1.4306) and a heat resistant steel (1.4876) has been optimized with respect to the maximal attainable aluminum content, the freedom from porosity and cracks and the homogeneity of phases in the aluminized layer. The nickel was found to be predominantly important, as together with Kirkendall porosity it governs the thermal stability of aluminized layers during corrosion and oxidation.High-temperature corrosion was examined in liquid sulphur, in H2/H2S- and in H2/H2S/H2O-atmospheres. In liquid sulphur the aluminized layer of austenitic steels fails by the occurrence of a periodically alternating sulphidation reaction which destroys the protective layer at 495°C. In gaseous mixtures the stability depends on the quality of an Al2O3-film on the aluminized layer which inturn is governed by the chemical composition of the aluminized layer. Beyond 900°C the transport of sulphur through Al2O3 occurs by simultaneous grain boundary-(“short circuit-”) and volume diffusion.
    Notes: Die Alitierung je eines Baustahles (Werkst. Nr. 1.7335), eines rostfreien Stahles (1.4306) und eines hitzebeständigen Stahles (1.4876) wurde hinsichtlich des maximal erreichbaren Aluminiumgehaltes, der Freiheit von Poren und Rissen und der Homogenität der Schutzschicht optimiert. Als wesentliche Einflußgröße für die Schutzschichtbildung wurde der Nickelgehalt festgestellt, von der, gemeinsam mit der Kirkendallporosität, die thermische Stabilität bei korrosiver und oxidativer Belastung entscheidend abhängt.Die Hochtemperaturkorrosion wurde in flüssigem Schwefel, in H2/H2S- und in H2/H2S/H2O-Gemischen untersucht. In flüssigem Schwefel versagt die Alitierschicht der autenitischen Stähle durch eine periodisch alternierende Sulfidierungsreaktion, die die Schutzschicht bei 495°C zerstört. In den Gasgemischen hängt die Beständigkeit von der Schutzwirkung des Al2O3-Filmes auf der Alitierschicht ab, dessen Qualität durch die chemische Zusammensetzung der Schicht bedingt ist. Oberhalb 900°C wurde im übrigen für den Schwefeltransport im Al2O3 neben der Korngrenzen-(“Kurzschluß-”) Diffusion auch Volumendiffusion nachgewiesen.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900411007
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  • 8
    Electronic Resource
    Electronic Resource
    CORIS®: Korrosionsdatenbank (1993)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 402-409 
    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: CORIS™: Corrosion data baseIn this paper the main component of the CORIS system, the corrosion database, is presented. The database contains corrosion facts for metallic materials with respect to all important corrosion parameters. E/R-Models (Entity-Relationship-models) were used for structuring the corrosion knowledge, and the functionality of the system is described in detail from the conceptual and the practical point of view. The system offers the possibility to enter own corrosion data as well as to evaluate stored data. The graphical interactive user interface was designed for simple use.
    Notes: In der vorliegenden Arbeit wird die Kernkomponente des Systems CORIS, die Korrosionsdatenbank, vorgestellt. In ihr sind Korrosionsfakten unter Berücksichtigung aller relevanten Parameter abgelegt. Es wird die dem System zugrunde liegende Korrosionsstruktur mit Hilfe von E/R-Modellen (Entity-Relationship-Modelle) erläutert und ein detaillierter Einblick in die Funktionalität und das Erscheinungsbild gegeben. Das System bietet dem Anwender die Möglichkeit, sowohl eigene Korrosionserfahrungen abzulegen als auch unter Eingabe von Suchbedingungen vorhandenes Wissen zu recherchieren. Die graphisch interaktive Benutzeroberfläche ist auch für ungeübte DV-Nutzer leicht zu bedienen.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19930441004
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  • 9
    Electronic Resource
    Electronic Resource
    Mikrobielle Werkstoffzerstörung - Simulation, Schadensfälle und Gegenmaßnahmen für anorganische nichtmetallische Werkstoffe: Biodeteriorationsprozesse an anorganischen Werkstoffen und mögliche Gegenmaßnahmen (1994)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 45 (1994), S. 105-113 
    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: Microbial deterioration of materials - simulation, case histories, and countermeasures for inorganic nonmetallic materials: Biodeterioration processes on inorganic materials and means of countermeasuresBiodeterioration processes on inorganic materials such as natural stone, concrete, or glass can be subdivided into biogeochemical and biogeophysiological mechanisms according to their damage characteristics. In connection with the partial acidification and dissolving of components, biocorrosion as a result of biogenic release of inorganic and organic acids, as well as the biogenic oxidation of mineral forming cations, a certain weakening in the structure of the respective material can occur. The formation of biofilms on the surfaces of the inorganic materials impairs not only the aesthetical appearance of an object but also causes alterations in its humidity and temperature behaviour. In addition, due to the shrinking and swelling effects of biofilms, mechanical pressure to the mineral unit can occur (bioerosion, bioabrasion). Location and environmental factors which could lead to specific, biogenically determined weathering phenomena on these materials will be presented and elucidated. For controlling biodeterioration processes, the development and selection of environmentally-friendly, yet effective, inorganic and organic biocidal additives for stoneprotection agents as well as the use of gas (e.g. ethylene oxide) in their far-reaching significance for future material research will be presented here.
    Notes: Biodeteriorationsprozesse an anorganischen Werkstoffen wie Naturstein, Beton oder Glas können in ihren Schädigungsweisen nach biogeochemischen und biogeophysikalischen Mechanismen unterteilt werden. Im Zusammenhang mit der partiellen Ätzung und Lösung von Bestandteilen, hervorgerufen durch die biogene Freisetzung anorganischer bzw. organischer Säuren (Biokorrosion) sowie der biogenen Oxidation mineralbildender Kationen (Biooxidation), kommt es zur Schwächung, des Gefüges im jeweiligen Werkstoff. Durch den Aufwuchs von Biofilmen auf den Oberflächen anorganischer Materialien kommt es neben ästhetischen Beeinträchtigungen auch zu Veränderungen im Feuchte- und Temperaturverhalten des Werkstoffes sowie aufgrund von Schrumpfungs- und Quellungsprozessen von Biofilmen zu mechanischer Druckbelastung auf den Mineralverband (Bioerosion, Bioabrasion). Standort- und Umweltfaktoren, die zu entsprechend biogenen Verwitterungsphänomenen an anorganischen Werkstoffen führen, werden vorgestellt und erläutert. für die Bekämpfung der Biodeteriorationsprozesse werden die Entwicklung und Auswahl umweltgerechter, aber dennoch wirksamer anorganischer bzw. organischer biozider Zuschlagstoffe für Gesteinsschutzstoffe sowie Begasungen (z. B. Ethylenoxid) in ihrer weitreichenden Bedeutung für die zukünftige Materialforschung vorgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19940450207
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchung der Strahlverschleißbeständigkeit von Werkstoffen und Beschichtungen mit Hilfe eines Wirbelbett-Testverfahrens (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 623-634 
    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: Investigation into the blasting wear resistance of materials and coatings using fluidized-bed processThe coatings for compressor blades and gas turbine blades - e.g. corrosion protection coatings or thermal barrier coatings - will be damaged by an additional erosive stress. Because the main function of the coatings is not the erosion protection but the corrosion protection respectively the thermal barrier, they have mostly a worse erosion behavior as the blade material. The actual protection effect of the coatings will be reduced importantly. Therefore the knowledges about the erosion behavior of the coatings are necessarily to use the coatings. For that reason, you have to know the parameter of blasting wear and their influence on the removing behavior of the coating or of the blade material and you have to transpose the knowledges in a practical blasting wear test. This work gives a survey about the conception of a blasting wear test procedure. The important mechanism and the influencing variables on blasting wear will be explained, the new developed test procedure will be presented, and at least it will reported about the results of erosion tests at anticorrosion coatings (inorganically bound aluminium coatings) and thermal barrier coatings (yttrium partially stabilized zirconium oxide).
    Notes: Die Beschichtungen für Verdichter- und Gasturbinenschaufeln- wie Korrosionsschutzüberzüge oder Wärmedämmschichten - werden vielfach durch eine zusätzliche erosive Beaufschlagung geschädigt. Da die Hauptaufgabe der Beschichtungen nicht der Erosionsschutz, sondern der Korrosionsschutz bzw. die Wärmedämmung darstellt, sind sie in ihrem Erosionsverhalten meist schlechter als der jeweilige Schaufelwerkstoff. Die eigentliche Schutzwirkung der Beschichtungen wird dadurch erheblich eingeschränkt. Für einen gezielten Einsatz von Beschichtungen sind somit Kenntnisse über deren Erosionsverhalten notwendig. Deshalb bedarf es, die Strahlverschleißparameter und deren Einfluß auf das Abtragsverhalten einer Beschichtung bzw. eines Werkstoffes zu kennen und dieses Wissen in ein praxisgerechtes. Verschleißprüfverfahren umzusetzen. Diese Arbeit gibt einen Überblick von der Konzeption eines Strahlverschleiß-Prüfverfahrens. Dabei werden die wichtigen Mechanismen und Einflußgrößen des Strahlverschleißes sowie das entwickelte Prüfverfahren vorgestellt, und anschließend werden die Ergebnisse der Strahlverschleißuntersuchungen an Korrosionsschutzüberzügen (anorganisch gebundene Aluminium-Überzüge) und an Wärmedämmschichten (Yttrium-teilstabilisierte Zirkonoxid-Schichten) erläutert.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900411105
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