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  • Articles: DFG German National Licenses  (17)
  • 1985-1989  (10)
  • 1945-1949  (2)
  • 1870-1879  (5)
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  • Articles: DFG German National Licenses  (17)
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  • 1
    Electronic Resource
    Electronic Resource
    Dependence of the polar phonon limited mobility in the two-dimensional electron gas in GaInAs/InP heterostructures on hydrostatic pressure and carrier concentration (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4296-4298 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report measurements of the pressure dependence of the mobility of a two-dimensional electron gas in GaInAs/InP single and multiple quantum well systems and at a single heterojunction. The mobility dependence on both carrier density and effective mass is derived and shown to be the same in each system. Current theories of polar optic phonon scattering do not explain the mobility variation with carrier density but can describe the effective mass dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339106
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reassessment of ionized impurity scattering and compensation in GaAs and InP including correlation scattering (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2342-2359 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pressure dependence of the electron Hall mobility has been measured in a wide variety of InP and GaAs samples. The results, analyzed by a number of techniques, indicate that, in general, very good agreement can be obtained between theory and experiment for pure material at temperatures where ionized impurity scattering is unimportant. When heavily doped samples of liquid-phase epitaxy (LPE) GaAs and vapor-phase epitaxy (VPE) InP were measured it was not possible to predict the experimental pressure dependence of the mobility using the Brooks–Herring theory of scattering from ionized impurities. The possibility of inaccuracies in analysis have been reduced by using an iterative solution of the Boltzmann equation, phase shift calculations, and also Moore's analysis [Phys. Rev. 160, 618 (1967)] for dressing and multi-ion corrections. However, these proved to be inadequate and we obtain the best agreement with experiment using the theory of Yanchev et al. [J. Phys. C 12, L765 (1979)] for scattering from a correlated distribution of impurities. The important effects of impurity correlation have been substantiated by studying samples of GaAs grown by molecular-beam epitaxy (MBE) and bulk GaAs subjected to neutron transmutation doping. The inability of impurities to correlate in such material is demonstrated by the close agreement between Brooks–Herring theory and experiment for these samples. When correlation scattering is taken into account, it becomes possible to explain the observed mobilities in heavily doped materials without having to always postulate autocompensation, as has been done by other authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339827
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Laser chemical vapor deposition of patterned Fe on silica glass: Observation and origins of periodic ripple structures (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2031-2034 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser chemical vapor deposition of patterned iron deposits on silica glass has been carried out using an Ar ion laser-driven dissociation of iron pentacarbonyl vapor. The structure of the deposited films has been studied using optical, electron, and scanning Auger microscopic techniques. Extensive iron silicate formation is observed at the iron-glass interface and 50-μm periodic ripples are formed in the delineated deposits. The origin of the periodic structure is discussed with reference to the available analytical data and observations from related laser processing studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336385
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of alloy scattering potential in Ga1−xAlxAs alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2640-2645 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature Hall mobility as a function of pressure (0–8 kbar) has been measured for high-purity liquid-phase-epitaxy-grown Ga1−xAlxAs layers. GaAs-like band structure of low-composition alloys has also been converted to Si-like band structure at high pressures and the Hall mobility measured as a function of temperature (77(approximately-less-than)T(approximately-less-than)300 °K) with crystals locked under constant pressures. The data have been analyzed to identify and distinguish the presence of space charge and alloy scatterings both characterized by mobilities limited by T−1/2. The space charge scattering has been found to be absent in all the crystals studied except x=0.047. The alloy scattering potential for electrons in the Γ minimum has been shown to depend on the alloy composition with a maximum value of 1.56 eV at x=0.19. For electrons in the X minima, this potential has been found to be independent of composition with a value of only 0.4 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335895
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Pressure dependence of the nonradiative lifetime in GaAs/AlGaAs double-heterostructure lasers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3448-3450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the linear losses in a GaAs/AlGaAs double-heterostructure laser as a function of applied hydrostatic pressure. The nonradiative lifetime increases by a factor 2.5 from zero to 7.6 kbar, and if this is due to recombination via a deep state, then the rate-limiting capture cross section decreases with pressure, suggesting capture by multiphonon emission. We find that it is necessary to postulate the existence of other nonlinear losses at threshold to account for the increase in threshold current with pressure measured on the same structure. Carrier transfer to higher conduction-band minima in the active or cladding regions are suggested as possible mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339313
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Atracurium recovery: prediction of safe reversal times with edrophonium (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 44 (1989), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The time to safe return of neuromuscular function after atracurium 0.3 mg/kg intravenously was assessed in 24 patients in whom anaesthesia was maintained with halothane 0.5%. Safe reversal (recovery to a T4 ratio 〉 05), after this dose of atracurium, could only be reliably and rapidly (〈 2 minutes) achieved with edrophonium if a period greater than 30 minutes elapsed since administration of the relaxant. This coincides with the appearance of four recognisable twitches if a train-of-four pattern of nerve stimulation is used. Thus, if no monitoring equipment is available, at least half-an-hour should elapse after administration of atracurium in a moderate dose (e.g. 0.3 mg/kg) before rapid and reliable reversal can be anticipated. Four twitches in a train-of-four should be recognisable, if a nerve stimulator is available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1989.tb09095.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A single occurrence of apple proliferation disease in England (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 35 (1986), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1986.tb02033.x
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    An analysis of the primary and secondary antibody response in intact and thymectomized rainbow trout, Salmo gairdneri Richardson, to human gamma globulin and Aeromonas salmonicida (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 31 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The antibody response to human gamma globulin (HGG) and Aeromonas salmonicida (AS) in control and long-term thymectomized rainbow trout was individually monitored in 120 fish. The fish responded poorly to HGG and no memory response was observed. There was no difference in response between control fish and fish which had been thymectomized for 5 months before immunization. However, 9-month thymectomized fish had lower titres than controls. The response to AS was vigorous and significant memory was demonstrated after a second injection. There was no difference in response between control and thymectomized fish. The individual variation in response was not related to body size, antigen dose, sex or reproductive state. The results are discussed in terms of the thymus dependency or independency of antigens in fish, and the role and life span of T cell subsets, such as ‘helper’ and ‘;suppressor’ cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05224.x
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  • 9
    Electronic Resource
    Electronic Resource
    Remarkable Colour-Variation in Lizards (1878)
    [s.l.] : Nature Publishing Group
    Nature 19 (1878), S. 53-53 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MR. WALLACE'S observations in NATURE, vol. xix. p. 4, on a black variety of the common lizard of Capri, as met with on the neighbouring islet of Faraglioni, induces me to refer to a similar appearance in the lizards frequenting the islet of Filfla, on the southern coast of Malta. As recorded in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/019053a0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    On the Sense of Hearing in Birds (1877)
    [s.l.] : Nature Publishing Group
    Nature 15 (1877), S. 334-335 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE sense of hearing is doubtless of much assistance in discovering the food of such birds as the scansores—to wit, woodpeckers, creepers, wrynecks and the like, which feed on insects. On one occasion, in a Canadian forest, whilst seated close to a rotting pine trunk, I heard distinct ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/015334c0
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