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  • Articles: DFG German National Licenses  (66)
  • 1990-1994  (44)
  • 1980-1984  (22)
  • 1
    Electronic Resource
    Electronic Resource
    Electrochemical capacitance-voltage profiling of n-type ZnSe (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5311-5317 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we report the first detailed study of electrochemical capacitance-voltage profiling of ZnSe. An electrolyte consisting of 1 M sodium hydroxide and 1 M sodium sulphite has been developed that does not deposit selenium while etching the surface of n-type ZnSe during C-V profiling. The dissolution number of the electrolyte/ZnSe system is a function of the strength of electrolyte and the etching current and in order to obtain an accurate etching depth a constant etching current mode was used. A wide range of doping concentrations including both uniformly doped and staircase structures have been measured demonstrating that the electrochemical C-V profiler can now be a routine tool for assessing the growth parameters of ZnSe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352016
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of deflection-mode damping in an accelerating structure (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6257-6260 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have directly measured the damping of wake-field deflection modes in a slow-wave accelerating structure consisting of a dielectric-lined waveguide with segmented conducting boundaries wrapped with rf absorbing material. Such damping of deflection modes is desired to prevent beam breakup instabilities. Attenuation e-folding times of 246 ps were recorded for deflection modes at the Advanced Accelerator Test Facility while the quality of the desired accelerating mode remained unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348823
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photocapacitance and photoconductance of Bi-doped ZnO (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4011-4016 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The density of occupied interface states as a function of energy in nonohmic polycrystalline Bi-doped ZnO was obtained using photocapacitance measurements. Peaks in the interface states' densities were observed at depths of 2.46 and 2.79±0.08 eV from the bottom of the conduction band. The combination of these two states was found in photoconductance measurements on Bi-doped samples of ZnO and not found in undoped samples; thus, these states were assumed to be related to interface states that arise from doping with Bi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348435
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Laser ablation of ZnSe using pulsed 193-nm irradiation (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2001-2008 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma jets have been produced by the pulsed laser ablation of bulk ZnSe targets. Electrical measurements show that a sudden increase in ion yield occurs at a threshold pulse energy density of 210 mJ cm−2 pulse−1. The plasmas obtained do not exhibit overall electrical neutrality, but have a net positive charge, while the ZnSe target develops a corresponding negative charge. The initial ion translational kinetic energies are also found to be very low, 〈1 eV. These observations suggest that the ablation process is the result of a buildup of photogenerated holes at the semiconductor surface sufficient to result in disintegration of the lattice and rapid vaporization at low thermal energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349485
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photochemical addition of tertiary amines to stilbene. Stereoelectronic control of tertiary amine oxidation (1981)
    s.l. : American Chemical Society
    The @journal of organic chemistry 46 (1981), S. 1077-1082 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00319a007
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Observation of multiple wavelength soliton collisions in optical systems with fiber amplifiers (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1715-1717 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Solitons of different wavelengths are found to exhibit substantial spectral and temporal changes when collisions are centered in erbium-doped fiber amplifiers. By using two soliton pulse trains, with ∼70-ps-wide pulses, spectrally separated by 1.8 A(ring), and 106 km of non-dispersion-shifted fiber, we observe a spectral and temporal shift of as much as 0.35 A(ring) and 55 ps, respectively, for each soliton. Both soliton wavelengths shift the same amount, but in opposite directions and remain undisturbed in terms of shape and amplitude after the collision. This shift may impose limitations on multiple wavelength soliton based communication systems utilizing fiber amplifiers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104044
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  • 7
    Electronic Resource
    Electronic Resource
    Output saturation characteristics of erbium-doped fiber amplifiers pumped at 975 nm (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2607-2609 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the signal saturation behavior of an erbium-doped fiber amplifier pumped at 975 nm. We have characterized the output saturation powers as a function of fiber length and observed that the output saturation powers peak at an optimum length close to the optimum length for small signal gain. The output saturation power is found to be higher at a signal wavelength of 1.555 μm than at 1.532 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102852
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Phosphate-Activated Glutaminase in Relation to Huntington's Disease and Agonal State (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 41 (1983), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Involvement of phosphate-activated glutaminase in Huntington's disease and agonal state was investigated in caudate nucleus and frontal cortex from postmortem brains. In Huntington's disease the activities of phosphate-activated glutaminase, glutamic acid decarboxylase, succinic dehydrogenase, choline acetyl-transferase, and acetylcholinesterase were significantly reduced in the caudate nucleus, but not in the frontal cortex. The activity of phosphate-activated glutaminase, and to a lesser extent of glutamic acid decarboxylase, was reduced in cases of terminal illness, as compared with cases of sudden death. Succinic dehydrogenase and choline acetyltransferase were reduced only in the few cases of prolonged and severe terminal illness. Enzyme activities of the caudate nucleus were more affected by agonal state than were those of frontal cortex. Results indicate that phosphate-activated glutaminase could be a useful marker of neuronal damage due to agonal state, and that phosphate-activated glutaminase and succinic dehydrogenase are reduced in Huntington's disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1983.tb04761.x
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The Interaction of Dithiothreitol and Acetyl Coenzyme A in a Radiochemical Assay for Rat Brain ATP:Citrate Oxaloacetate Lyase (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 37 (1981), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: [14C]Acetyl-CoA was found to react spontaneously with dithiothreitol to give a relatively apolar product which was readily extractable into a butanol-toluene scintillant. This technique was used in a rapid, reproducible assay for rat brain ATP:citrate lyase using [1,5-14C]citrate as substrate. The tissue extract, a 14,000 g supernatant, exhibited a lyase activity of approximately 7 nmol acetyl-CoA produced/min per mg supernatant protein, and was inhibited ≥79% by α-ketoglutaric acid (10 mm), Cu2+ (1 mm)and Zn2+(1 mm). [14C]Oxaloacetate, [14C]malate and endogenous citrate synthase were found not to interfere significantly with lyase estimations, but NADH was required in the reaction mixture to inhibit acetyl-CoA hydrolase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1981.tb05296.x
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Gravity Currents in the Laboratory, Atmosphere, and Ocean (1982)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 14 (1982), S. 213-234 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.14.010182.001241
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