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  • Articles  (72)
  • 2010-2014  (7)
  • 1985-1989  (54)
  • 1920-1924  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Localization of virginiamycin S binding site on bacterial ribosome by fluorescence energy transfer (1986)
    s.l. : American Chemical Society
    Biochemistry 25 (1986), S. 3540-3547 
    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/bi00360a011
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  • 2
    Electronic Resource
    Electronic Resource
    Ion-induced depletion of hydrogen from a soft carbonized layer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3833-3837 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft carbonized layers prepared in a glow discharge, with a hydrogen concentration of H:C∼4/3, are exposed to helium ion bombardment at energies between 0.3 and 2.6 MeV. A strong ion-induced depletion of up to 3×103 H atoms per incident 4He+ ion is observed by means of high-energy ion beam analysis. The hydrogen release is shown to be a local process, with the electronic energy deposition as the main responsible mechanism. The results are successfully compared to a model which takes into account local bond breaking and retrapping and the local formation of hydrogen molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343399
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic depth profile measurements of implanted deuterium in nickel (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1893-1897 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Depth profiles of 10-keV deuterium implanted in nickel were obtained during implantation through elastic recoil detection between 233 and 313 K. The profiles were allowed to reach saturation at each measured temperature. At the lowest temperature, measurements with various implantation fluxes were performed. Aside from surface peaks, the depth profiles show a uniform density of deuterium in the implanted layer and the shape of these profiles is independent of the sample temperature or implantation fluence or flux. The temperature and fluence dependence could be successfully reproduced with a trapping-detrapping model considering three different trap binding energies. Two of the model parameters are in good agreement with previous calculations performed to reproduce reemission measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342900
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  • 4
    Electronic Resource
    Electronic Resource
    On the growth of segregated C layers on top of Fe films on pyrolytic graphite samples during high-fluence D+ irradiation at elevated temperature (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3400-3406 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On Fe films evaporated on pyrolytic graphite, thick C layers segregate during high-temperature (above about 800 K) light ion irradiation if the penetrating ions are energetic enough to reach the Fe-graphite interface. The thickness of the C segregated layer and the C depth distribution in the Fe film have been determined with 2-MeV 4He+ Rutherford backscattering. A steady-state carbon overlayer is reached at high fluences (above about 1019 particles/cm2), the thickness of which depends on the energy of the irradiating beam for a given thickness of the Fe evaporated film. The anisotropic structure of the pyrolytic graphite substrate influences the thickness of the steady-state C overlayer, thicker C layers being measured for edge-oriented C substrates. Using the Monte Carlo code trim, the production of defects in the graphite substrate has been calculated for different thicknesses of the C overlayer. The total amount of defects produced in the graphite substrate has been identified as the parameter regulating the growth and the steady-state value of the C overlayer. With the depth distributions of defect production generated by trim as source functions, the diffusion of C interstitials in graphite under the influence of recombination with vacancies has been modeled. The segregating C fluxes are identified with the fluxes of interstitials arriving at the Fe/graphite substrate interface for a suitable choice of the parameters in the diffusion equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342656
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  • 5
    Electronic Resource
    Electronic Resource
    Modeling of hydrogen implantation into graphite (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4860-4866 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new theoretical framework has been developed which is applicable to the implantation and ion-induced release of hydrogen isotopes in graphite. It provides a physical basis and a refinement of the predictions of the simple model of local saturation and mixing. The model treats the trapping at defects and a local release of trapped atoms by nuclear knock-on. Ion deposition and damage functions are taken from trim simulations. The detrapped atoms may become retrapped or recombine to molecules, which then are transported to the surface by fast molecular diffusion, and subsequently released. By the choice of suitable rate constants in the model calculations, different experimental findings for the implantation and high-fluence self-reemission of deuterons in graphite may be explained consistently. Examples cover the saturation as a function of temperature and energy, depth profiles, gas reemission, thermal desorption, and effects of predamage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341234
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  • 6
    Electronic Resource
    Electronic Resource
    Permeation of implanted deuterium through Ni near room temperature (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 2733-2738 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The permeation of 2–22-keV deuterons implanted into 25-μm-thick cold-rolled Ni foils was studied near room temperature. The results are generally characterized by a time lag τ and a steady-state permeation rate J. The variation of τ with beam intensity and temperature indicates an average relative concentration of ∼4×10−4 of saturable bulk traps of binding energy 0.26±0.01 eV, plus a larger concentration of weaker traps. At the highest energy, J is well described by theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335415
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  • 7
    Electronic Resource
    Electronic Resource
    Light emission from CH and H sputtered from hydrogen-implanted graphite (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 2225-2226 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Characteristic spectra of light emission from CH molecules and hydrogen atoms sputtered from hydrogen-implanted graphite are observed. The relative intensities from both species vary with the implanted fluence. The CH yield remains constant while the Hα yield increases. This is consistent with two binding states of implanted hydrogen in graphite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99539
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  • 8
    Electronic Resource
    Electronic Resource
    Die Adsorption des Formaldehydes durch Tierkohle (1921)
    Springer
    Colloid & polymer science 28 (1921), S. 127-132 
    Details
    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
    Notes: Zusammenfassung 1. Formaldehyd wird durch Tierkohle sowohl in saurer als auch in neutraler Lösung in bedeutendem Maße adsorbierl. 2. Die Adsorption sowohl in neutralisierter als auch saurer Lösung folgt den Adsorptionsgesetzen, d. h. die Adsorption ist abhängig von der Konzentration. 3. Die Adsorption des Formaldehydes durch die Tierkohle in saurer Lösung ist ferner in weitgehenstem Maße von dem Volum abhängig. Aus großem Volum wird erheblich mehr, als aus kleinem Volum bei gleicher Konzentration adsorbiert. 4. In neutraler Lösung wird die Adsorption des Formaldehydes unabhängig von dem Volum und ist lediglich abhängig von der dargebotenen absoluten Menge des Formaldehydes bezw. der Konzentration. 5. Die Adsorption in neutraler Lösung ist unabhängig von der Zeit und tritt das Gleichgewicht nach kurzer Einwirkungsdauer ein. Die Adsorption aus saurer Lösung ist abhängig von der Zeit und tritt selbst nach 8 tägiger Einwirkung kein Gleichgewicht ein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427881
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  • 9
    Electronic Resource
    Electronic Resource
    Die Gerinnungserscheinungen in Gelatine-Chlornatriumlösungen (1921)
    Springer
    Colloid & polymer science 28 (1921), S. 281-290 
    Details
    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
    Notes: Zusammenfassung 1. Es wurde der Gerinnungswert verdünnter, mit Chlornatrium gesättigter Gelatinelösungen durch Säuren ermittelt. 2. Der Gerinnungswert steigt mit dem Dissoziationsgrad der Säure und ist demnach bei anorganischen Säuren größer, wie bei organischen. 3. Das Maximum der Gerinnung der daran beteiligten Trockensubstanz der Gelatinelösung durch irgendeine Säure liegt bei einer ganz bestimmten Konzentration. 4. Neben der Gerinnung finden Adsorptionserscheinungen zwischen dem geronnenen Teil und der Säure in Verbindung mit den nicht der Gerinnung fähigen Anteilen statt. 5. Die Erscheinungen wurden nach der Mizellar-Hypothese von Nägeli's erklärt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01464428
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  • 10
    Electronic Resource
    Electronic Resource
    Die Gerbung der Gelatine durch Formaldehyd (1921)
    Springer
    Colloid & polymer science 29 (1921), S. 45-55 
    Details
    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
    Notes: Zusammenfassung Die Gerbung der Gelatine ist ein zweiphasiger Vorgang. Die eigentliche Gerbung des gerbfähigen Anteiles ist physikalischer Natur und an diesem nimmt nur der gerinnbare Anteil der Gelatine teil. Der nicht gerinnbare Anteil der Gelatine tritt mit dem Formaldehyd in chemische Wechselwirkung unter Bildung von Methylenaminosäuren. Die der Gerbung fähige Menge der Gelatine entspricht dem Gerinnungswert der unbehandelten Gelatine Wird der gerinnbare Anteil durch Hydrolyse infolge Wasserstoffionenwirkung vermindert, so wird auch der gerbfähige Anteil dadurch vermindert. Die gerbenden Bestandteile der Formaldehydlösung sind die unlöslichen kolloiden Polymeren des Formaldehydes, die in der Hauptsache erst während der Einwirkung auf die Gelatine entstehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425137
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