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  • Articles: DFG German National Licenses  (9)
  • 1985-1989  (9)
  • 1988  (9)
Source
  • Articles: DFG German National Licenses  (9)
Material
Years
  • 1985-1989  (9)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Effect of heat treatment on redistribution of hydrogen in directionally cast polycrystalline silicon (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1670-1671 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of heat treatment on the minority-carrier surface recombination velocity in hydrogen-passivated polycrystalline silicon samples has been studied in the temperature range 350–500 °C using the electron-beam-induced current mode of a scanning electron microscope. Minority-carrier trap center densities, calculated from the minority-carrier surface recombination velocity data, varying from 8×1012 to 1.2×1012 cm−2 have been measured. A finite decrease in the minority-carrier trap center density indicates that hydrogen atoms diffuse to the surface from the bulk of the hydrogenated samples. The activation energy of hydrogen diffusion in silicon is found to be 0.53±0.04 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99053
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Low- and high-field transport properties of pseudomorphic InxGa1−xAs/In0.52Al0.48As (0.53≤x≤0.65) modulation-doped heterostructures (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1945-1949 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown pseudomorphic InxGa1−xAs/In0.52Al0.48As modulation-doped heterostructures by molecular-beam epitaxy under carefully controlled growth conditions. Mobilities as high as 13 900, 74 000, and 134 000 cm2/V s are measured at 300, 77, and 4.2 K in a heterostructure with x=0.65. Shubnikov–de Haas measurements indicate that the change in the effective mass with increasing In is not significant and is not responsible for the enhancement in mobilities. We believe that the improvement results from reduced alloy scattering, reduced intersubband scattering, and reduced impurity scattering, all of which result from a higher conduction-band offset and increased carrier confinement in the two-dimensional electron gas. The high-field electron velocities have been measured in these samples using pulsed current-voltage and pulsed Hall measurements. A monotonic increase in velocities is observed both at 300 and 77 K with an increase of In content in the channel. Velocities of 1.55×107 and 1.87×107 cm/s are measured at 300 and 77 K, respectively, in a In0.65Ga0.35As/In0.52Al0.48As modulation-doped heterostructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341748
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of heat treatment on redistribution of fast diffusing impurities in polycrystalline silicon (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 942-944 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of heat treatment on minority carrier surface recombination velocity in polycrystalline silicon samples has been examined in the temperature range (600–900 °C) using the electron-beam induced-current mode of a scanning electron microscope. Minority carrier trap center density, calculated from minority carrier surface recombination velocity data, varying from 8.9×1011 to 6.37×1013 cm−2 have been measured. A finite variation in the minority carrier trap center density indicates that metallic impurities diffuse to the surface from the bulk of the sample. The activation energy of impurity atom diffusion is found to be 1.1±0.1 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341900
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy energy in single crystal Y1.8Er0.2Fe14B (invited) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3139-3139 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There has been considerable interest in tetragonal R2Fe14B compounds as a basis for a new class of permanent magnet materials because of the unusually large energy products they exhibit at room temperature for certain rare-earth substitutions. The origin of the high-energy products is directly related to the large saturation magnetization and magnetic anisotropy energy. The magnetocrystalline anisotropy energy is believed to be directly related to an interaction between the 4f-electrons and the crystal field: however, to date few if any direct comparisons have been made between the experimental magnetic anisotropy and crystal field theory. The reason being that the large anisotropy energy makes it very difficult to use conventional torque magnetometry techniques to determine the angular dependence of the magnetic free energy, particularly at low temperatures where the higher-order terms become important. In this investigation we determine the angular dependence of the magnetic free energy as a function of temperature for Y1.8Er0.2Fe14B using high field (6 T) torque magnetometry techniques and make a direct comparison of the free energy with the energy calculated using a model based on crystal field theory. Y1.8Er0.2Fe14B was chosen because the Fe and Er sublattice anisotropy energies nearly cancel at low temperatures making it possible to measure anisotropy. Excellent agreement was obtained between the model and experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340867
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Nifedipine prevents the pressor response to laryngoscopy and tracheal intubation in patients with coronary artery disease (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 43 (1988), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The efficacy of sublingual nifedipine, administered one minute before anaesthetic induction, in order to minimise the pressor response to laryngoscopy and tracheal intubation was studied in a group of 15 patients who underwent coronary artery bypass surgery. Another group of 15 similar patients served as control. Premedication consisted of oral diazepam 5–10 mg, intramuscular morphine 0.2 mg/kg and promethazine 0.4 mg/kg. Anaesthesia was induced with morphine. 0.1–0.15 mg/kg and thiopentone 3–5 mg/kg. Laryngoscopy and tracheal intubation were facilitated with suxamethonium 1.5 mg/kg. A significant increase in blood pressure occurred during and after laryngoscopy and tracheal intubation in the control group. This increase was absent in the patients pretreated with nifedipine. The nifedipine group also maintained a lower rate-pressure-product than the control group during the period of study. It is concluded that nifedipine 10 mg is a useful pretreatment to prevent the pressor response to laryngoscopy and tracheal intubation in patients with coronary artery disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1988.tb06642.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Variation in spontaneous chromosomal damage as a function of biologic rhythms in women (1988)
    Springer
    Human genetics 〈Berlin〉 79 (1988), S. 83-85 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An unequivocal observation of a higher rate of cellular genetic damage in terms of increased frequencies of sister chromatid exchanges (SCEs) and chromosome aberrations during “ovulatory” and “estrogenic” stages as compared with those of “progestogenic” stage of the menstrual cycle in women and the reported fluctuations in SCEs as a function of time in men indicate that chronobiologic considerations are essential in the design of studies of humans and animal experiments. It seems that female subjects are more influenced by biologic rhythms because of specific hormonal cycles and are sensitive to genetic damage during ovulatory/estrogenic stages of the menstrual cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291717
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of brainstem auditory evoked responses in congenital hydrocephalus (1988)
    Springer
    Child's nervous system 4 (1988), S. 334-338 
    Details
    ISSN: 1433-0350
    Keywords: Brainstem auditory evoked responses ; Brainstem dysfunction ; Congenital hydrocephalus ; Ventriculoperitoneal shunt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Brainstem auditory evoked responses (BAER) were studied in 20 children with clinically diagnosed and CT-confirmed congenital hydrocephalus before and after shunt surgery. Ninety-five percent of the children showed abnormal responses preoperatively. Prolonged wave V latency was the most common abnormality, followed by increased interwave latencies. Total absence of evoked responses was more common in children with communicating hydrocephalus. Following shunt surgery 50% of cases returned to normal and 20% showed a significant improvement. Abnormalities persisted in 10% of cases. BAER abnormalities referrable to caudal brainstem dysfunction recovered first, following CSF diversion. Study of BAER is useful for identifying physiological brainstem abnormalities in hydrocephalic children and promises to be a sensitive non-invasive diagnostic tool for the detection of “non-infective complications” of shunt surgery, if performed serially during follow up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270606
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Novel technique for crystal growth of superconducting ErBa2Cu3O7 (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 181-190 
    Details
    ISSN: 1572-9605
    Keywords: ErBa2Cu3O7 ; crystal growth ; microscopy ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Millimeter-sized crystals of ErBa2Cu3O7 were fortuitously grown while sintering a flat disk. It was possible to separate individual crystals from the sintered mass and measure their properties. The resistive transition and onset of magnetic transition of a single crystal was 93 K and the resistive transition width was 〈 1 K. Flux expulsion was observed and individual crystals could be levitated by a magnetic field. Crystals showed unusual growth features. They were heavily corrugated along the part of the crystal that grew parallel to the top surface of the disk and that coincided with thec axis of the unit cell. Crystals were characterized by X-rays, electron microscopy, and optical microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617662
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    High temperature photoconductivity of chemically deposited cadmium sulphide thin film (1988)
    Springer
    Journal of materials science 7 (1988), S. 151-152 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730602
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    Paper (German National Licenses)
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