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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8653-8655 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report results of an investigation of interdiffusion in GaAs/Ga0.82In0.18As strained single quantum wells. Wells of width 12–100 A(ring), grown by organometallic vapor phase epitaxy, were subjected to 10 s rapid thermal anneals of 830–950 °C, and shifts in the electron-to-heavy-hole transition energies were detected by 4 K photoluminescence. We employed a powerful computer model to relate postdiffusion well shape to changes in photoluminescence energies, enabling estimation of diffusivity. Interdiffusion rates of 1×10−16–2×10−14 cm2/s and activation energies of 3.1–3.8 eV were obtained.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5703-5705 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y1Ba2Cu3O7−x films were fabricated by a reactive evaporation method using 10-mol-% O3 gas as an oxygen source. Mass spectroscopy measurement revealed that hydrogen gas was ejected from Y metal and Ba metal sources during evaporation. Y1Ba2Cu3O7−x film growth was adversely affected by the existence of this hydrogen gas, confirmed by in situ reflection high-energy electron diffraction (RHEED) observation. A streak RHEED pattern was maintained throughout evaporation only when the hydrogen partial pressure was smaller than 1×10−6 Torr. Only films grown under this condition showed superconducting behavior.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High temperature and very low threshold current operation of a separate confinement heterostructure (SCH) AlGaInP/GaxIn1−xP (x=0.43) strained multiple quantum well (SMQW) lasers has been achieved. Continuous wave (cw) operation was observed up to at least 150 °C with an output power of more than 7 mW, which is the highest cw operating temperature ever reported for devices operating in the visible wavelength region. The characteristic temperature between 20 and 80 °C was 130 K. The threshold current and threshold current density at 25 °C were 13.9 mA for a 5×160 μm device and 430 A/cm2 for a 80×770 μm device.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 654-655 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystal growth mechanism in Bi-Sr-Ca-Cu-O thin films has been revealed by sequential deposition with an electron cyclotron resonance (ECR) oxygen plasma using in situ reflection high-energy electron diffraction (RHEED) observation. A series of RHEED patterns presents clear evidence that the unit cell of the Bi-Sr-Ca-Cu-O structure is completed as the Bi layers have sandwiched Sr, Ca, and Cu layers. This crystalline process is not an atomic layer by atomic layer growth but a "unit cell by unit cell'' growth.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1383-1385 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An a-axis oriented 400 A(ring) YBa2Cu3O7−δ film has been epitaxially deposited on a NdGaO3 (110) substrate by rf magnetron sputtering using a single YBa2Cu5Ox target. An excitation frequency of 94.92 MHz, seven times as high as the conventionally used 13.56 MHz, results in a lower self-bias voltage which reduces degradation of films caused by resputtering due to negatively charged oxygen. Sharp streaks corresponding to the c-axis lattice parameter of YBa2Cu3O7−δ have been observed by reflection high-energy electron diffraction, showing that the c-axis is parallel to the surface of the NdGaO3 substrate and the film surface is smooth on an atomic scale. The crystallinity has been characterized by Rutherford backscattering channeling analysis. A minimum yield, χmin of 3.2%, has confirmed excellent crystallinity of the a-axis oriented film.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 63 (1992), S. 537-539 
    ISSN: 1432-1246
    Keywords: Vibration syndrome ; Antinuclear antibody ; Collagen disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a study undertaken to investigate the relationship between vibration syndrome and collagen disease, 90 Japanese patients with vibration syndrome (all men aged 41–86 years) were examined immunologic abnormalities, mainly by a set of immunoserology tests. Of these 90 patients, 25 had examinations at yearly intervals for 3 consecutive years, while the other 65 underwent examinations once. The results indicate that, of all the patients studied, 10 (11.1%) gave a positive RA test, 6 (6.7%) had leukopenia, 5 (5.6%) had hypergammaglobulinemia, and 15 (16.7%) had hypocomplementemia (CH50). Worthy of particular note are the 21 patients (23.3%) who were positive for nuclear-specific antibodies (1: ≥ 40) (using Hep-2 cells as the nuclear substrate), with some of them suspected of having Sjögren's syndrome, progressive systemic sclerosis, or systemic lupus erythematosus. During a 3-year follow-up period, 10 (40%) of 25 patients exhibited rising titers of nuclear-specific antibodies with conversion to seropositivity for these antibodies. The facts that the positivity rate for nuclear-specific antibodies was significantly higher in these patients with vibration syndrome (23.3%) than in healthy adult men over 40 years of age (1.8%) (P 〈 0.05) and that a progressive elevation of nuclear-specific antibody titer was noted in a high percentage of the patients were suggestive of some causal relationship between the appearance of nuclear-specific antibodies and the use of vibrating tools.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 29 (1992), S. 35-42 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The syntheses of some representative low molecular weight poly-p-silphenylenes containing SiMe2 or SiPh2 groups in the main chain are using either THF or Et2O as solvent. The insertion of the butylenoxy units in the main chains of the polymers was observed when THF was used as a solvent. The polymers were characterized by a combination of IR,1H and13C — NMR spectra and vapour pressure osmometric analysis. The thermal behaviour of the poly-p-silphenylenes was analysed by thermogravimetry.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inorganic and organometallic polymers and materials 3 (1993), S. 305-315 
    ISSN: 1572-8870
    Keywords: Poly(phenylsilyne) ; polysilyne ; photooxidation ; refractive index ; relief modulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We studied the chemical and optical changes in poly(phenylsilyne) films induced by irradiation at λ〉350 nm and λ〉320 nm. An increase in the number of SiOSi and SiOH groups is observed by FTIR measurements after irradiation. The presence of refractive index and relief modulations in these films is reported.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inherited metabolic disease 16 (1993), S. 982-990 
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three Japanese patients with carbonic anhydrase II (CAII) deficiency from three families were described. The parents of one patient were unrelated, the parents of each of the other two patients were first cousins. All the patients had renal tubular acidosis, osteopetrosis, symmetrical cerebral calcification and mental retardation. They exhibited poor activity and poor appetite in the neonatal period, and then developed psychomotor retardation. Two of them were diagnosed as having osteopetrosis at 10 months and 36 years of age, respectively, and the other as having osteomalacia at 28 years of age. All patients had recurrent episodes of muscle weakness. The CAII enzyme activity and protein levels in red blood cells in each of the three patients were deficient. Their parents exhibited approximately 50% normal levels of CAII activity and protein. This is the first report of patients with CAII deficiency in the Japanese population.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inherited metabolic disease 16 (1993), S. 917-917 
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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