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  • 1
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die Verweilzeitverteilung des Gases in mehrstufigen Wirbelschichtanlagen wurde untersucht. Als Spurengas diente Helium. Bei den Versuchen wurden die Partikelkonzentration, die Zahl der Wirbelschichtstufen und deren bezogene Höhe verändert. Ein Vergleich mit den Ergebnissen von Untersuchungen an absatzweise betriebenen Wirbelschichtanlagen ergaben, daß bei kontinuierlichem Durchfluß der fluiden und der partikelförmigen Phase durch die mehrstufige Anlage das Gas die engere Verweilzeitverteilung aufweist und daher zu günstigeren Betriebsbedingungen beiträgt.
    Notes: Abstract The residence time distribution of the gas in multistage fluidised beds is studied, using Helium as tracer, for different conditions of the solids concentration, the number of stages and the height-to-diameter ratio of the stage. The results are compared with that of batch fluidisation with and without baffles and it is found that continuous fluidisation gives better flow characteristics of the gas and possesses a wider range of operation than batch fluidisation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Eight vertical profiles compiled from simultaneous measurements of Aitken nuclei and ozone concentrations over Germany in different weather conditions are discussed. The position and shape of the profiles is shown to depend on the prevailing weather conditions and the type of air masses. High aerosol concentrations in smoke plumes correlate in some cases with lower ozone concentrations, indicating that ozone in such cases is destroyed in the presence of high concentrations of pollutants such as aerosols and gases. A layered structure in the profiles was found only in association with temperature inversions and where the air above 2 km was subsiding, and was not found in convective parts of the troposphere.
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  • 3
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Registrierungen der Chloridteilchenkonzentration in der bodennahen Luft an der Westküste von Dänemark während einer Dauer von fünf Monaten zeigen eine sehr klare Abhängigkeit vom Wetterablauf. Dabei werden hohe Konzentrationen bei stürmischen Westwetterlagen mit Vorbeizug von Tiefdruckgebieten, niedrige bei Ostwetterlagen mit hohem Luftdruck über Skandinavien gefunden. Dieser Befund zeigt klar, dass grosse Mengen von Chloridteilchen wohl ausschliesslich in den Starkwindfeldern der Zyklonen über dem Meere durch Zerstäuben von Gischt erzeugt werden. Einige Ergebnisse über Grössenverteilungsbestimmungen werden mitgeteilt.
    Notes: Summary For a periode of five months, the chloride particle concentrations in the air near the ground were measured at the west-coast of Denmark. The results show clearly, that high concentrations are connected with west wind, especially with passages of cyclones over Denmark or Skagerrak, low concentrations with east wind and anticyclones over Scandinavia. This lead us to the conclusion, that high concentrations of chloride particles are generated in the storm-areas of deep cyclones over the sea.
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  • 4
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Description / Table of Contents: Summary The Hard-Inclusion Stressmeter and Its Use in Rock Mechanical Model Tests The hard-inclusion stressmeter, developed during recent years for determination of in-situ stress in rock masses, is in principle applicable also to model tests. This application, the calibration and an example are described.
    Notes: Zusammenfassung Die spannungsoptische Meßpatrone in ihrer Anwendung im gebirgsmechanischen Modellversuch Die in den letzten Jahren für in-situ-Messungen von Gebirgsspannungen entwickelte spannungsoptische Meßpatrone kann in entsprechender Ausführung auch in Modelle für gebirgsmechanische Untersuchungen eingesetzt werden. Die Anwendung im Modellversuch, die Eichung und ein Beispiel werden erläutert.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 243 (1971), S. 154-165 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The generalized Veneziano Model has been applied by Chanet al. to the processes (K¯KΠN¯N) with very impressive results, but in this treatment baryon spin was neglected. In this work we give a covariant spin and isospin decomposition of the above class of processes. Postulating factorization at the lowest meson and baryon poles and using the very stringent duality diagram prescription we are led to a Veneziano type ansatz for the various invariant amplitudes.
    Type of Medium: Electronic Resource
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  • 6
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 242 (1973), S. 109-109 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HOYLE'S assertion that only 5 sources per steradian are missing at the bright end1 is based on the apparent Euclidean nature of the source counts. My derivation of the steady-state source counts2 expected if radio galaxies have cosmological redshifts shows that the Euclidean slope of ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 240 (1972), S. 399-400 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Identifications and redshifts exist now for all SCR sources that are more than 15 degrees from the galactic equator and that have a 178 MHz flux density S178 exceeding 30 flux units (1 f.u. = 10-26 W m-2 Hz-1). Table 1 gives the flux density Si 7 8, the radio spectral index a = d log Sv/d log v and ...
    Type of Medium: Electronic Resource
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  • 9
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 377 (1970), S. 305-309 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Borontribromide and one or two equivalents of alkaneselenol react under formation of dibromo-alkylselene-boranes or monobromo-bis-alkylselenoboranes. From the reaction of selenophenole and BBr3 phenylborondibromide is formed.
    Notes: Bortribromid reagiert mit einem oder zwei Äquivalenten Alkanselenol zu Dibrommonoalkylselenoboranen Br2BSeR bzw. zu den instabilen Monobromdialkylselenoboranen BrB(SeR)2. Aus Selenophenol und BBr3 entsteht dagegen Phenylbordibromid.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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