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  • 1
    Electronic Resource
    Electronic Resource
    Carbon-13 NMR study of the stereospecificity of the thiohemiacetals formed on inhibition of papain by specific enantiomeric aldehydes (1986)
    s.l. : American Chemical Society
    Biochemistry 25 (1986), S. 2293-2298 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00356a066
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: Absolute partial and total electron impact ionization cross sections for CF4 from threshold up to 180 eV [J. Chem. Phys. 83, 5712 (1985)] (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1207-1207 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451875
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  • 3
    Electronic Resource
    Electronic Resource
    Electron attachment to carbon dioxide clusters at very low electron energies (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 2942-2946 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron attachment to CO2 clusters formed by nozzle expansion was investigated in a crossed molecular-beam–electron-impact–mass spectrometer system. In addition to cluster ions previously observed at 3–4 eV electron energy we observe presently cluster ions produced at around zero electron energy. Some of these ions are likely produced by a less dissociative production mechanism allowing the probing of cluster beams with better reliability than previously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449830
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  • 4
    Electronic Resource
    Electronic Resource
    Absolute partial and total electron impact ionization cross sections for CF4 from threshold up to 180 eV (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5712-5720 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron impact ionization of carbon tetrafluoride was studied as a function of electron energy from threshold up to 180 eV. A double focusing mass spectrometer system with an improved electron impact ion source was used, alleviating the problems of ion extraction from the source and the transmission of the extracted ions through the mass spectrometer system. Absolute partial ionization cross section functions for the production of CF+3, CF+2, CF+, C+, F+, CF2+3, and CF2+2 in CF4 have been determined. In addition, the total (and the counting) ionization cross section function of CF4 has been determined (summation method) and is compared with calculations based on classical and semiclassical binary encounter approximations. Using nth root extrapolation ionization energies of the following doubly charged fragment ions have been derived: AE (CF2+3) =41.8±0.3 eV, AE (CF2+2) =42.9±0.3 eV, and AE (CF2+)=52.1±0.5 eV. In accordance with previous results no stable CF+4 parent ion has been detected, however, a metastable dissociation process CF+@B|4→ CF+3+F has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449646
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  • 5
    Electronic Resource
    Electronic Resource
    Ein Mehrfluidmodell für die turbulente Gas- und Flüssigkeitsfilm-Strömung (1986)
    Springer
    Heat and mass transfer 20 (1986), S. 291-299 
    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 Zur Berechnung des Impulstransports in einer abwärts gerichteten, turbulenten Zweiphasenströmung, bestehend aus einer Gasphase und einem Flüssigkeitsfilm (Kern/Film-Strömung) mit welliger Phasengrenzfläche, wird ein Mehrfluidmodell eingeführt. Das Strömungsfeld wird in einen Grundfilm-, einen Wellen- und einen Kernbereich eingeteilt. Die Phasenverteilung im Strömungsfeld wird durch die unvollständige Gamma-Funktion dargestellt, die Reibung zwischen den Phasen durch einen Reibungsbeiwert, welcher von einem dimensionslosen Druckgradienten abhängig ist. Durch Lösung des Gleichungssystems ergibt sich der Druckabfall der Kern/Film-Strömung als Funktion der Reynolds-Zahl des Films und des Kerns. Der berechnete Druckabfall stimmt mit dem aus empirischen Korrelationen gut überein.
    Notes: Abstract A multifluid-model is introduced for the momentum transport of a downwards directed turbulent two-phase-flow consisting of a gaseous core and a liquid film (core-film-flow) with wavy interface. The flow field is subdivided into a basic film region, a wavy region and the gaseous core. The phase distribution is represented by the incomplete Gamma-function, and the friction between the phases is given by a friction factor depending on a dimensionsless pressure gradient. From the solution of the governing equations the pressure drop of the core-film-flow is obtained as a function of the liquid- and the core-Reynolds-number. The calculated pressure drop is in good agreement with that obtained from empirical correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01002420
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  • 6
    Electronic Resource
    Electronic Resource
    A pneumotoxin, O,O,S-trimethyl phosphorothioate, induces hemorheological alteration in rats (1989)
    Springer
    Archives of toxicology 63 (1989), S. 325-330 
    Details
    ISSN: 1432-0738
    Keywords: Lung injury ; Hemorheology ; Inflammation ; O,O,S-trimethyl phosphorothioate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract O,O,S-trimethyl phosphorothioate (OOS-TMP), an impurity present in widely used organophosphorus insecticides, has been shown to induce lung injury after oral administration. To date, very little is known about the hemorheological changes which may occur during the inflammation of lung caused by OOS-TMP. The present study has demonstrated that oral administration of OOS-TMP (10 mg/kg, 20 mg/kg) to rats produced an increase in whole blood apparent viscosity at 24, 48 and 72 h following the treatment in rats. Concomitantly, the plasma fibrinogen level and red blood cell (RBC) aggregation were increased at 24 and 48 h. There was no change in RBC filterability. Thus, OOS-TMP, a pneumotoxin, was capable of causing a systemic hemorheological alteration, probably via increase in fibrinogen content, an acute-phase protein, in rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278647
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  • 7
    Electronic Resource
    Electronic Resource
    Wärmeübertragung bei freier Strömung im überkritischen Gebiet reiner Fluide (1985)
    Springer
    Heat and mass transfer 19 (1985), S. 187-194 
    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 Der Wärmeübergang an einer senkrechten Platte bei freier Strömung von Kohlendioxid in der Nähe des kritischen Punktes wurde durch numerische Lösung der Grenzschichtgleichungen berechnet und mit Experimenten verglichen. Wie die Rechenergebnisse vor allem in unmittelbarer Nähe des kritischen Punktes zeigten, muß man zur Berechnung des Wärmeübergangs nicht allein den jeweiligen Stoffwert berücksichtigen, sondern auch dessen Änderung innerhalb der Grenzschicht. Dies ist besonders dann notwendig, wenn der kritische Punkt bzw. die pseudokritische Temperatur in der thermischen Grenzschicht liegen und die Stoffwerte dort extreme Änderungen erfahren. Die Stoffwerte ändern sich in der Nähe des kritischen Punktes in einem sehr schmalen Temperaturintervall. Die Änderung der Stoffwerte ist dabei extrem groß. Mit zunehmender Entfernung vom kritischen Punkt wird das Intervall längs einer Isobaren breiter, die Änderung der Stoffwerte aber geringer. Aus diesem Grund ist der Einfluß der Stoffwerte auf den konvektiven Wärmeübergang von der jeweils angelegten Temperaturdifferenz abhängig.
    Notes: Abstract Natural convective heat transfer to carbon dioxide near its critical point was investigated. For a vertical flat plate of constant temperature the boundary layer equations were solved with variable fluid properties. The numerical results were compared with experiments and it was shown that calculated heat transfer coefficients near the critical point depend not only on the physical properties, but also on variations of these properties. Especially the extreme property variations have to be considered, if the critical point is inside the thermal boundary layer. In the vicinity of the critical point the properties are changing in a very narrow temperature range. With increasing distance this range becomes more extended and the property variations less important. Therefore the influence of physical property variations on natural convective heat transfer depends also on the temperature difference between the wall and the bulk temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403755
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  • 8
    Electronic Resource
    Electronic Resource
    Einfluß von Rohrreihenzahl und Anströmturbulenz auf die Wärmeleistung von quer angeströmten Rohrbündeln (1987)
    Springer
    Heat and mass transfer 21 (1987), S. 103-113 
    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 Es werden die Ergebnisse einer experimentellen Untersuchung des Wärmeübergangs und Druckabfalls an Einzelreihen sowie an drei-, vier- und fünfreihigen Glattrohrbündeln vorgestellt. Die Rohre wurden innen mit kondensierendem Wasserdampf beheizt und außen von querströmender Luft gekühlt. Durch Einbau von verschiedenen Turbulenzgittern konnte die Anströmturbulenz vor dem Bündel zwischen 0,8% und 25% variiert werden. Die Quer- und Längsteilung betrug 1,54 und 3,07; die Reynolds-Zahl lag zwischen 1,5 · 104 und 1,5 · 105. Die Verbesserung des mittleren Wärmeübergangs am Rohrbündel nimmt mit steigendem Turbulenzgrad und mit abnehmender Reihenzahl zu. Die Druckverlustbeiwerte der Rohrbündel sind nahezu unabhängig von der Anströmturbulenz. Es zeigte sich, daß durch Einbau von Turbulenzgittern die Wärmeleistung der Rohrbündel erhöht werden kann.
    Notes: Abstract Results of experimental investigations on heat transfer and pressure drop in single rows and in bundles of three, four, and five rows of plain tubes are presented. The tubes were heated by saturated steam, condensing inside, and cooled outside by crossflowing air. The turbulence intensity in the entrance cross section before the bundles was varied between 0.8% and 25% by means of grids. The transversal and the longitudinal pitch to diameter ratio was 1.54 and 3.07; air-side Reynolds numbers ranged from 1.5-104 to l.5 ·105. The enhancement of heat transfer is due to the increase of the turbulence level and also due to a decreasing number of rows. The drag coefficient for the bundle is almost independent of the inlet turbulence intensity. It turned out that the use of turbulence grids leads to higher efficiencies of the tube bundles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01377566
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  • 9
    Electronic Resource
    Electronic Resource
    Reflectivity measurements in the vacuum ultraviolet wavelength range on technical surfaces for the Wolter I telescope on board the X-ray astronomy satellite ROSAT (1986)
    Springer
    Astrophysics and space science 125 (1986), S. 169-174 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of reflectivity measurements in the vacuum ultraviolet wavelength region (VUV) on technical surfaces are described which are used in the Wolter I-telescope on board the German X-ray astronomy satellite ROSAT. The materials investigated are the special iron-nickel alloy Invar and a carbon fibre compound (CFK). The centre connecting flange for the parabolic and hyperbolic mirror sections of the telescope is made of Invar. CFK is used for the thermal baffle in front of the telescope. It had to be checked whether the structure of the centre flange and the thermal baffle sufficiently suppress scattered ultraviolet radiation in order to avoid a substantial background level in the detectors which are located in the focal plane of the telescope. The detectors consist of two positional sensitive proportional counters (PSPC) with a spatial resolution of 0.5 arc min and an image converter with a resolution of a few arc sec. The detectors are mounted on a carrousel platform and are intended to be positioned alternatively in the focal plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643981
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  • 10
    Electronic Resource
    Electronic Resource
    The MIDAS Data-Bank System for the transport properties of fluids (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 973-986 
    Details
    ISSN: 1572-9567
    Keywords: correlation ; data bank ; fluid mixtures ; oxygen ; pure fluids ; transport equation of state ; thermal conductivity ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The development of the MIDAS Data-Bank System from its origin as part of the first DECHEMA properties data project in 1977 is described. The system concentrates the rapidly increasing amount of data for the viscosity and thermal conductivity for pure fluids and fluid mixtures by evaluation of the most reliable data sets. The data sets are represented by density-temperature correlations which are the customary method to correlate transport properties. To allow for a direct calculation of the transport properties from given pressures and temperatures, a new type of equation has been developed. As an example, the simultaneous representation of the viscosity and thermal conductivity of oxygen by one transport equation of state is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503852
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