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  • Artikel: DFG Deutsche Nationallizenzen  (43)
  • 2005-2009  (1)
  • 1985-1989  (42)
  • 1
    Digitale Medien
    Digitale Medien
    Employment of the disabled (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Industrial relations journal 16 (1985), S. 0 
    Details
    ISSN: 1468-2338
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: The MSC proposes to end the employment quota scheme for the disabled and replace it by statutory obligation plus a code of practice. This article examines the difficulties which employers would face in demonstrating that they complied with the code and casts doubt on the benefit to the disabled themselves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1468-2338.1985.tb00506.x
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  • 2
    Digitale Medien
    Digitale Medien
    Single-crystal YBa2Cu3O7−x and Bi2Ca1+xSr2−xCu2O8+y surfaces and Ag adatom-induced modification (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3130-3135 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Comparison of x-ray photoemission results for single crystal and polycrystalline YBa2Cu3O7−x allows us to identify oxygen vacancies in the Cu-O chains and determine their effects on the Cu, Ba, and Y core level line shapes. The deposition of adatoms of Ag onto single crystals of YBa2Cu3O7−x and Bi2Ca1+xSr2−xCu2O8+y leads to changes in the Cu 2p3/2 emission indicative of slight Cu2+ to Cu1+ surface reduction, with greater modification for the 1-2-3's than the 2-1-2-2's. O 1s core level results show Ag-induced broadening because of these surface effects. The Ba 3d and Y 3d structures showed minimal changes for the 1-2-3 surface. Ag deposition onto the 2-1-2-2 samples also leads to Bi dissociation and subsequent surface segregation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.342709
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  • 3
    Digitale Medien
    Digitale Medien
    High-performance short-wavelength single quantum well pump lasers (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1246-1247 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Performance of graded-index separate-confinement heterostructure single quantum well lasers especially designed for cw optical-pumping applications is reported and is compared to that of conventional double-heterostructure devices. The quantum well devices have the advantage of lower threshold current, higher slope efficiency, and can be operated at longer cavity lengths, leading to lower diode-series resistance and reduced cooling requirements. Quantum wells of aluminum composition ranging from 6.7% to 12% and thicknesses of 12 and 20 nm were investigated. Useful lasing wavelengths between 780 and 820 nm were achieved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339995
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  • 4
    Digitale Medien
    Digitale Medien
    Y, Ba, Cu, and Ti interface reactions with SrTiO3 (100) surfaces (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4943-4950 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Interface reactions of adatoms of Y, Ba, Cu, and Ti with ordered and disordered SrTiO3 (100) surfaces were examined with x-ray photoemission spectroscopy, Auger spectroscopy, and low-energy electron diffraction. Atomic distributions for these interfaces before and after annealing at 500 °C were determined using Ar ion sputter depth profiling. We observed strong reactions of Y and Ba with O extracted from the substrate for both ordered and disordered SrTiO3, with the strongest interactions occurring for Y on the disordered surface. These reactions were diffusion limited at 300 K, and the growth of a metal overlayer was observed with increasing coverage. Comparison of these results to those for Ti/SrTiO3 made it possible to determine the extent of the reactions and the reaction products. At elevated temperatures, more extended out-diffusion of O from the substrate into the overlayer was observed, completing the conversion to the respective metal oxides. In contrast, Cu deposited on SrTiO3 formed clusters on the surface and did not react with the substrate. O out-diffusion was not observed for the Cu overlayer at elevated temperatures, but clustering was enhanced. The implications of these results are discussed in terms of Y-Ba-Cu-O superconductor synthesis on SrTiO3.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343211
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  • 5
    Digitale Medien
    Digitale Medien
    Infrared thermography of the DIII-D divertor targets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1878-1880 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The power flow to the DIII-D divertor targets is routinely measured using infrared (IR) thermography. An IR television camera sensitive to radiation in the 8–12-μm range views the divertor region using a set of germanium optics. Digital signal processing is used to extract the desired surface temperature profiles from the analog data ((approximately-equal-to)12 Mbytes) stored on videotape. Inversion of these data using a simple matrix formulation of the inverse heat conduction problem then yields the incident heat flux as a function of space and time. Results from a DIII-D discharge are included.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140040
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  • 6
    Digitale Medien
    Digitale Medien
    Fast, variable apertures in count-rate optimized x-ray and particle diagnostic instruments for fusion (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 966-968 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We are incorporating a system of fast, variable apertures in our designs for the x-ray, neutral, and ion spectrometers for plasma diagnostics on Mirror Fusion Test Facility B (MFTF-B). The purpose of these apertures is to maintain optimized count rates, and thus optimized measurement statistics during an experimental shot, where flux variations as large as 104–105 may occur in periods as short as 0.1 s. We shall discuss the application of the fast apertures to the x-ray spectrometer in particular, and to the other diagnostic instruments in general. The particular design requirements for the optimized aperture system will be discussed, as will be the influence the system has on the data-handling process. We have performed experiments to test this new concept and shall present the results, including the details of the closed-loop feedback circuit controlling the apertures, optimization of the loop gain, and the engineering issues of the system, such as the effect of vacuum feedthrough, position sensitivity, and alignment criteria.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138515
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  • 7
    Digitale Medien
    Digitale Medien
    Neutral-beam performance analysis using a CCD camera (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2069-2071 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We have developed an optical diagnostic system suitable for characterizing the performance of energetic neutral beams. An absolutely calibrated CCD video camera is used to view the neutral beam as it passes through a relatively high-pressure (10−5 Torr) region outside the neutralizer: collisional excitation of the fast deuterium atoms produces Hα emission (λ=6561 A(ring)) that is proportional to the local atomic current density, nearly independent of the species mix of accelerated ions over the energy range 5–20 keV. Digital processing of the video signal provides profile and aiming information for beam optimization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138741
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  • 8
    Digitale Medien
    Digitale Medien
    Diagnostic system for measurement of particle balance in TMX-U (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2072-2074 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Several diagnostics measure the particle sources and losses in the Tandem Mirror Experiment-Upgrade (TMX-U) plasma. An absolutely calibrated high-speed (0.5 ms per frame) filtered (6561 A(ring)) video camera measures the total ionization source as a function of radius. An axial view of the plasma automatically integrates the axial variations within the depth of field of the system. Another camera, viewing the plasma radially, measures the axial source variations near the deuterium fueling source. Axial ion losses are measured by an array of Faraday cups that are equipped with grids for repelling electrons and are mounted at each end of the experiment. Unequal ion and electron (nonambipolar) radial losses are inferred from net current measurements on an array of grounded plates at each end. Any differences between the measured particle losses and sources may be attributed to ambipolar radial losses and/or azimuthal asymmetries in the particle-loss profiles. Methods of system calibration, along with details of computer data acquisition and processing of this relatively large set of data, are also presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138742
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  • 9
    Digitale Medien
    Digitale Medien
    Tandem-Mirror Experiment-Upgrade neutral pressure measurement diagnostic systems (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 978-980 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The Tandem-Mirror Experiment-Upgrade (TMX-U) has a large and complex system of Bayard–Alpert, magnetron, and Penning gauges, in addition to mass spectrometers (RGA), all of which measure neutral pressures in the many internal regions of TMX-U. These pressure measurements are used as part of the confinement physics data base as well as for management of the TMX-U vacuum system. Dynamic pressures are modeled by a coupled-volumes simulation code, which includes wall reflux, getter pumping, and plasma pumping.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138010
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  • 10
    Digitale Medien
    Digitale Medien
    Use of angle-dependent photoemission for atom profiling: Au on compound semiconductors (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 118-120 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We present studies of Au film formation on the III-V compound semiconductors GaAs and InSb based on polar-angle-dependent x-ray photoelectron spectroscopy. The results highlight the power of this technique as a nondestructive tool for atom profiling. The Au overlayer is highly heterogeneous due to disruption of the original surface and significant anion segregation in Au. Although GaAs and InSb show common behavior, significant differences are observed because the anion–cation bond strength determines the extent of the surface disruption and semiconductor atom solid solubilities in Au dominate the segregation patterns in each system. We present a model of the overlayer structure, based on thermodynamic considerations, which shows very good quantitative agreement with the observed profiles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.98587
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