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  • 1975-1979  (22)
  • 1935-1939  (3)
  • 1890-1899  (1)
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 6 (1977), S. 253-258 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Была исследована адсорбция водорода с целью определения дисперсии платины, нанесенной на различные материалы с высокими содержаниями кремния, а именно на пористые стекла, SiO2 и SiO2, обработанный кислотой. Показано, что обработка SiO2 кислотой приводит к большей дисперности платины по сравнению с SiO2 и пористыми стеклами. Обсуждается влияние распределения размера пор, как друтого важного фактора, на распределение размеров платиновых кристаллитов и на дисперсность.
    Notes: Abstract Hydrogen adsorption has been investigated in order to determine the dispersity of platinum supported on different silicon-containing materials, such as porous glasses, silica and acid treated silica. The acid treatment of silica results in more dispersed platinum as compared with silica and porous glasses. The influence of pore size distribution as a further important factor on Pt-crystallite distribution and dispersity is discussed.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 8 (1978), S. 443-449 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Была иццледована активностя различных MoO3−SiO2 и WO3−SiO2 катализаторов для ароматизации пропилена и бутадиена. Полученные результаты указывают на сранительно высокую активность ароматизации для пропилена. Было установлено, что прямое превращение бутадиена в зтилбензол при использовании WO3 на подогретом кислотном кремнезёме как раз является альтернативным маршрутом рэакции к известному промежуточному шагу на пути к бензолу и зтилену.
    Notes: Abstract The activity of various MoO3−SiO2 and WO3−SiO2 catalysts for the aromatization of propylene and butadiene has been investigated. The results obtained show a comparatively high aromatization activity of the catalysts for propylene to benzene and toluene. The direct conversion of butadiene to ethylbenzene, using WO3 on acid treated silica, is considered to be an alternative reaction pathway to the known metathesis step to ethylene and benzene.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 160 (1978), S. 231-234 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary From a UV-irradiated sample of diploid cells several clones were isolated, which produced cells with a shortened life span. A closer examination of three of these clones showed among other deviations from the wild type a higher sensitivity to UV-irradiation. Three other clones, which were selected from a haploid strain as UV-sensitive mutants, proved to be shortlived as well. In all these strains photoreactivation and liquid holding reactivation were unimpaired. There was no cross-sensitivity to X-irradiation. The correlation between shortened life span and UV-sensitivity is discussed.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 256 (1978), S. 181-181 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 256 (1978), S. 181-181 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 257 (1979), S. 1133-1158 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Longitudinal resonant vibrations are means to determine Young's modulusE of cylindrical bars with high accuracy. Mathematical relations between modulusE, Poisson's ratiom, size and weight of bar, and the resonant frequencies measured are established by the theory of longitudinal vibrations. This theory is developed and described for bars with and without additional loads at the ends in three stages (simple theory, Rayleigh's approximation, extended theory). Additional loads are needed to transmit vibrations of polymer and other non-magnetic samples electromagnetically. The ranges of validity of the three stages of the theory are discussed with reference to the ratio of diameter to length, the Poisson's ratio, and the additional loads of bars. Stress components and deformations as well as the shape of a vibrating bar are calculated.
    Notes: Zusammenfassung Longitudinale Schwingungsresonanzen erlauben die Bestimmung des ElastizitätsmodulsE zylindrischer Proben mit hoher Genauigkeit. Den Zusammenhang zwischen ModulE, Poissonzahlm, Stabdaten und gemessenen Resonanzfrequenzen vermittelt die Theorie der Longitudinalschwingung. Diese Theorie wird hier in drei Stufen (einfache Form, RayleighKorrektur, erweiterte Theorie) für Stäbe mit und ohne Zusatzmassen an den Enden hergeleitet und dargestellt. Die Zusatzmassen dienen zur elektromagnetischen Schwingungsübertragung bei Polymerproben und anderen nicht ferromagnetischen Stoffen. Der Geltungsbereich der verschiedenen Stufen der Theorie wird in Abhängigkeit vom Dickenverhältnis, der Poissonzahl und der Zusatzmasse der Stäbe diskutiert. Spannungskomponenten und Deformationen sowie die Gestalt des Stabes bei der Schwingung werden berechnet.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 433 (1977), S. 284-286 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Influence of the Heat Treatment of the Basic Glass on the Properties of Porous GlassesThe influence of the heat treatment of the basic glass has been studied in respect to the carrier properties of porous glasses for platinum (1 wt.-%) for dehydrocyclization of n-hexane. Connections between heat treatment micropore structure and catalytic activity are discussed.
    Notes: Es wurde der Einfluß der thermischen Vorbehandlung des Ausgangsglases (7% Na2O, 23% B2O3, 70% SiO2) auf die Trägereigenschaften poröser Gläser für Platin (1 Gew.-%) bei der Dehydrocyclisierung von n-Hexan untersucht. Zusammenhänge zwischen Thermobehandlung, Mikroporenstruktur und katalytischer Aktivität werden diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 242-248 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Hydrogenation of Hydrocarbons on Catalysts of the System Porous Glass-MetalThe hydrogenation of hydrocarbons such as cyclohexen, benzene and styrene on metal catalysts (Ni, Pd, Pt) supported by porous glasses and zeolites was investigated in the gasphase.In dependence on the pore structure catalysts of the type porous glass-metal are able to a shape selective catalysis like zeolite catalysts.
    Notes: Die Hydrierung von Kohlenwasserstoffen, wie Cyclohexen, Benzol und Styrol wurde in der Gasphase an Metall-Trägerkatalysatoren (Ni, Pd, Pt) auf der Basis von porösen Gläsern und Zeolithen untersucht.In Abhängigkeit von der Porenstruktur zeigen Katalysatoren des Typs poröses Glas-Metall die Fähigkeit zu einer formselektiven Katalyse wie Zeolith-Katalysatoren.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 249-252 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation of CO over Catalysts Supported by Porous GlassesIt is reported on the catalytic activity of metal catalysts (Ag, Mn, Ni, Cu/Zn, Fe/Cr) supported by porous glasses for the oxidation of CO. In comparison with impregnated carrier catalysts metal catalysts prepared by ionexchange of porous glasses (Ag+) show a higher activity for oxidation of CO.The preparation of ionexchanged forms of porous glasses is described.
    Notes: Es wird über die katalytische Aktivität von Metallkatalysatoren (Ag, Mn, Ni, Cu/Zn, Fe/Cr) auf der Basis poröser Gläser bei der Oxydation von CO berichtet. Im Vergleich zu imprägnierten Metall-Trägerkatalysatoren zeigen die durch Ionenaustausch von porösen Gläsern mit Metallionen (Ag+) hergestellten Metall-Trägerkatalysatoren eine höhere Aktivität für die Oxydation von CO.Die Herstellung ionenausgetauschter Formen poröser Gläser wird beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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