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  • 11
    Electronic Resource
    Electronic Resource
    Experimentelle und numerische Untersuchung laminarer, axisymmetrischer Freistrahlen mit und ohne Auftrieb (1978)
    Springer
    Heat and mass transfer 11 (1978), S. 131-144 
    Details
    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 Das Verhalten axisymmetrischer, laminarer und inkompressibler Freistrahlen mit und ohne Auftrieb in einer homogenen Umgebung wird experimentell und numerisch untersucht. Die dazu erstellte Versuchsanlage wird kurz beschrieben. Charakteristische Grö\en von Fluidstrahlen ohne Auftrieb lassen sich unter Beachtung der beschreibenden Kenngrö\en parameterfrei darstellen. Auftriebsbehaftete Fluidstrahlen werden durch drei Parameter, die Reynoldszahl, die Grashofzahl und die Prandtlzahl vollständig beschrieben. Die Einflüsse der einzelnen Grö\en werden anhand der numerischen Lösung diskutiert, welche ihrerseits mit asymptotischen Verfahren kontrolliert wird. Die experimentellen Ergebnisse stimmen mit den berechneten Werten sehr gut überein. Die Versuche zur Stabilität laminarer Strahlen lassen sich gut mit einem Impulsstromparameter korrelieren.
    Notes: Abstract Axisymmetrical, laminar and incompressible jets with and without buoyancy in homogeneous surroundings are investigated experimentally and numerically. The experimental set up is described. Characteristics of jets without buoyancy are presented in a parameterless form. Buoyancy — induced jets are completely determined by three parameters, the Reynolds-Number, the Grashof-Number and the Prandtl-Number. The influence of the characteristic numbers to the numerical solution is discussed. On the other hand this result is controlled by analytical solutions. The experimental results are in good agreement with the predicted values. The experiments for stability of laminar jets are correlated with a parameter of momentum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682614
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  • 12
    Electronic Resource
    Electronic Resource
    Oberflächenspannung von leichtem und schwerem Wasser (1980)
    Springer
    Heat and mass transfer 13 (1980), S. 241-252 
    Details
    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 Für die Oberflächenspannung von leichtem Wasser wurde von der Arbeitsgruppe III der International Association for the Properties of Steam eine Rahmentafel und eine einfache Interpolationsgleichung erarbeitet und als internationaler Standard empfohlen. Die Rahmentafel basiert auf allen bekannten Messungen der Oberflächenspannung, die einzelnen Meßreihen wurden entsprechend der Meßgenauigkeit gewichtet. Die Form der Interpolationsgleichung läßt sich physikalisch begründen. Sie stellt einen erweiterten Ansatz nach van der Waals dar, wobei der Exponent der Gleichung mit den “Scaling-Laws” in Übereinstimmung ist. Weiter wird für den praktischen Gebrauch eine einfache Beziehung für den Laplace-Koeffizienten und die Dichtedifferenz zwischen der flüssigen und gasförmigen Phase von leichtem Wasser angegeben. Für schweres Wasser kann die gleiche Form der Interpolationsgleichung verwendet werden, deren Koeffizienten angegeben sind. Allerdings beruht diese Gleichung nur auf einer Meßreihe.
    Notes: Abstract A Skeleton Table and simple interpolation equation for the surface tension of light water was developed by the Working Group III of the International Association for the Properties of Steam and is recommended as an International Standard. The Skeleton Table is based on all known measurements of the surface tension and individual data were weighted corresponding to the accuracy of the measurements. The form of the interpolation equation is based on a physical concept. It represents an extension of van der Waals-equation, where the exponent conforms to the “Scaling Laws”. In addition for application purposes simple relations for the Laplace-coefficient and for the density difference between the liquid and gaseous phases of light water are given. The same form of interpolation equation for the surface tension can be used for heavy water, for which the coefficients are given. However, this equation is based only on a single set of data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01002412
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  • 13
    Electronic Resource
    Electronic Resource
    Die Temperaturabhängigkeit der Oberflächenspannung von reinen Kältemitteln vom Tripelpunkt bis zum kritischen Punkt (1980)
    Springer
    Heat and mass transfer 14 (1980), S. 59-73 
    Details
    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 Oberflächenspannung von sechs reinen Substanzen — SF6, CCl3F, CCl2F2, CClF3, CBrF3 und CHClF2 — wurde mit Hilfe einer modifizierten Kapillarmethode gemessen. Die zur Berechnung der Oberflächenspannung erforderlichen Sättigungsdichten σ ′ und σ ″ wurden teils aus vorhandenen Zustandsgleichungen, teils aus ebenfalls gemessenen Brechungsindizes bestimmt. Die Temperaturabhängigkeit der Oberflächenspannung läßt sich durch einen erweiterten Ansatz nach van der Waals σ=σO (Tc-T)μ(1+...) darstellen, wobei bei einfachen Stoffen ein eingliedriger, bei polaren und assoziierenden Stoffen ein zweigliedriger Ansatz notwendig und ausreichend ist. Für den kritischen Exponenten der Oberflächenspannung wurde ein von der molekularen Substanz weitgehend unabhängiger Wert von μ=1.284±0.005 gefunden.
    Notes: Abstract The surface tension of six fluids (SF6, CCl3F, CCl2F2, CClF3, CBrF3, CHClF2) have been measured by means of a modified capillary rise method. The liquid vapor densities, which are needed to calculate the surface tension, have partly been determined by means of refractive indices simultaneously measured in the same apparatus. The temperature dependence of the surface tension is described by an extended van der Waals power law σ=σO(Tc-T)μ(1+...). For simple fluids one term and for polar and associating fluids two terms are necessary and sufficient. The critical exponent μ is found to be 1.284 ± 0.005 and nearly independent of the molecular structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613625
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  • 14
    Electronic Resource
    Electronic Resource
    Plasma lipid peroxides and antioxidants in human septic shock (1991)
    Springer
    Intensive care medicine 17 (1991), S. 40-44 
    Details
    ISSN: 1432-1238
    Keywords: Septic shock ; Lipid peroxidation ; Alphatocopherol ; Selenium ; Oxygen free radicals ; Outcome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to assess if an oxidant/antioxidant imaalance is involved in human septic shock and its outcome, we measured plasma levels of the lipid peroxides malondialdehyde—as thiobarbituric acid reactive substance—conjugated dienes and fluorescent products, together with the antioxidants alpha-tocopherol, glutathione peroxidase activity and selenium in 12 patients with septic shock and compared them with values of normal controls. At first measurements, malondialdehyde (median 3.9 μmol/l; range 2–38.8) and fluorescent products (median 21.2%; range 9.4–134) were elevated (p〈0.05), alpha-tocopherol (median 15 μmol/l; range 7–25) and selenium (median 0.76 μg/ml; range 0.49–1.09) were depressed (p〈0.05). Conjugated dienes and glutathione peroxidase activity were in the normal range. In non-survivors (n=5) initial levels of malondialdehyde and fluorescent products (median 11 versus 3.1 μmol/l; 74 versus 135 respectively) were higher than in survivors (p〈0.05) and initial selenium levels were lower (median 0.58 versus 0.92 μg/l;p〈0.05). These results are consistent with the concept that an oxidant/antioxidant imbalance—as indicated by elevated plasma lipid peroxides and depressed antioxidants—is involved in human septic shock and a fatal outcome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01708408
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  • 15
    Electronic Resource
    Electronic Resource
    Genetische Untersuchungen anSordaria Macrospora Auersw., Kompensation und Induktion bei Genbedingten Entwicklungsdefekten (1958)
    Springer
    Molecular genetics and genomics 89 (1958), S. 729-746 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00888561
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  • 16
    Electronic Resource
    Electronic Resource
    Experimentelle Untersuchungen zum Artbildungsproblem. III (1942)
    Springer
    Molecular genetics and genomics 80 (1942), S. 271-280 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01741986
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  • 17
    Electronic Resource
    Electronic Resource
    Mechanism of the Toxic Effects of Hyperbaric Oxygen (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 1196-1196 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the experiments described here, the reduction of NAD was studied by coupling it to a system which utilizes NADH, namely the synthesis of glutamate from a-oxoglutarate and ammonia4. Table 1 shows that oxygen at 3 atm. has no effect on the synthesis of glutamate, even after pre-incubation for 60 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2151196a0
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  • 18
    Electronic Resource
    Electronic Resource
    Book reviews (1982)
    Springer
    Theoretical and applied genetics 61 (1982), S. 304-304 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272845
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  • 19
    Electronic Resource
    Electronic Resource
    Besprechungen (1956)
    Springer
    Naturwissenschaften 43 (1956), S. 167-168 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00623118
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  • 20
    Electronic Resource
    Electronic Resource
    Das Licht bei der Auslösung der Fruchtkörperbildung von Didymium eunigripes und die Übertragung der Lichtwirkung durch das tote Plasma (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 219-220 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00623036
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