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  • 2000-2004  (6)
  • 1990-1994  (11)
  • 1945-1949  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Effect of ion implantation dose on the interdiffusion of GaAs-AlGaAs interfaces (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2087-2090 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental results of enhanced interdiffusion of GaAs-AlGaAs interfaces are reported. These are obtained by implanting Ar ions at doses ranging from 2×1013 to 5×1014 cm−2 into heterostructure samples followed by rapid thermal annealing at 950 °C for 30 s. The degree of intermixing decreases from the surface up to the projected ion range and is a function of the implantation dose. It is postulated that this variation results from the coalescence of some of the excess vacancies into extended defects, which are then unavailable to assist in the enhanced interdiffusion process. By assuming that the concentration of mobile vacancies at any depth is proportional to the ion's electronic energy loss and inversely proportional to the ion's nuclear energy loss, the calculated intermixing results are shown to be in good agreement with the experimental data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346562
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  • 2
    Digitale Medien
    Digitale Medien
    Evidence for the Presence of Streptothricin in Streptolin Culture Filtrates (1947)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 69 (1947), S. 3145-3146 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01204a506
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of lattice strain and defects on the superconductivity of MgB2 (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 4399-4401 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The influence of lattice strain and Mg vacancies on the superconducting properties of MgB2 samples has been investigated. High quality samples with sharp superconducting transitions were synthesized. The variations in lattice strain and Mg vacancy concentrations were obtained by varying the synthesis conditions. It was found that high strain (∼1%) and the presence of Mg vacancies (∼5%) resulted in lowering the Tc by only 2 K. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1428109
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  • 4
    Digitale Medien
    Digitale Medien
    High current YBa2Cu3O7−δ thick films on flexible nickel substrates with textured buffer layers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1961-1963 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: High current YBa2Cu3O7−δ (YBCO) thick films on flexible nickel substrates with textured buffer layers were fabricated. Highly textured yttria-stabilized-zirconia buffer layers were deposited by using ion beam assisted deposition (IBAD). Pulsed laser deposited YBCO films were not only c-axis oriented with respect to the film surface but also strongly in-plane textured. The in-plane mosaic spread of YBCO films was ∼10°. A critical current density of 8×105 A/cm2 was obtained at 75 K and zero field for thin YBCO films. It was also demonstrated that thick YBCO films with a high critical current and excellent magnetic field dependence at liquid nitrogen temperature can be obtained on flexible nickel substrates by using the textured buffer layers. The result indicates that thick film technology in combination with IBAD buffer layers could be a viable method for fabricating YBCO tapes in long lengths. © 1994 American Institue of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112830
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  • 5
    Digitale Medien
    Digitale Medien
    Single depressed-index cladding ridge waveguide laser with a low aspect ratio (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1317-1319 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A novel ridge waveguide semiconductor laser diode is introduced, which contains a single depressed-index cladding layer. Deployment of this layer significantly reduces the transverse beam divergence, while maintaining reasonable values for the optical confinement factor, Γ, and the lateral index step. For lasers with 500 A(ring) active layers and ridge widths of 4 μm, we measured transverse and lateral far-field beam divergences of 16.4° and 8.2°, respectively, and threshold currents of 67 mA for 500-μm-long devices.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.108717
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  • 6
    Digitale Medien
    Digitale Medien
    High-temperature superconductor Josephson junctions with a gradient Pr-doped Y1−xPrxBa2Cu3O7−δ (x=0.1, 0.3, 0.5) as barriers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2866-2868 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: High-temperature superconductor YBa2Cu3O7−δ based superconducting-normal-superconducting (SNS) Josephson junctions were fabricated using a unique device design. The normal material included a gradient Pr-doped Y1−xPrxBa2Cu3O7−δ layer which was composed of a light doping (x=0.1) next to both YBa2Cu3O7−δ electrodes, a slightly higher doping (x=0.3) towards the center, and a doping concentration of x=0.5 in the middle of the N layer. This design graded the lattice mismatch between YBa2Cu3O7−δ and the N layer, thus avoiding the accumulation of all the lattice strain at one interface. It also results in good chemical, thermal, and structural compatibility between adjacent layers for the desired multilayer structures. The SNS junctions fabricated in this way showed resistively shunted junction current-voltage characteristics under dc bias and Shapiro steps under microwave irradiation at a temperature in the range of 75–87 K. Direct current superconducting quantum interference devices showed a voltage modulation about 5 μV by a magnetic field at liquid nitrogen temperature. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112518
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  • 7
    Digitale Medien
    Digitale Medien
    Synthesis of epitaxial Pt on (100)Si using TiN buffer layer by pulsed laser deposition (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2693-2695 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: High-quality epitaxial Pt films were deposited by pulsed laser deposition on (100)Si using TiN as a buffer layer. The films were (100) oriented normal to the substrate surface with a high degree of in-plane orientation with respect to the major axes of the substrate and buffer layer. An ion beam minimum channeling yield of 39% was obtained for the Pt films, indicating high crystallinity. High-resolution transmission electron microscopy results showed that interfaces between substrate/film and film/film were quite smooth and no perceptible interdiffusion was observed. The epitaxial TiN layer effectively acts as a barrier to impede metal-substrate reaction and helps in good adhesion of the Pt films on (100)Si. This structure is suitable for epitaxial growth of oxide films on Si with an underlying conductive electrode. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112608
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  • 8
    Digitale Medien
    Digitale Medien
    Evaluation of the feed value of a transgenic strain of the narrow-leaf lupin (Lupinus angustifolius) in the diet of the marine fish, Pagrus auratus (2003)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture nutrition 9 (2003), S. 0 
    Details
    ISSN: 1365-2095
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: This study assessed the nutritional and biological value of a noncommercial, transgenic line of the Australian sweet lupin, Lupinus angustifolius, (cv. Warrah), produced to increase the methionine content of the seed. An initial experiment demonstrated that differences in the methionine content of the transgenic and nontransgenic control lupins had no apparent influence on the growth of juvenile red seabream fed practical diets. Re-evaluation of the nutritional characteristics of the lupin meals with subsequent digestibility studies allowed the determination of the digestible value of the protein and energy content of each of the varieties. The digestible protein content of either variety was similar, however significant differences in the digestible energy value of each variety existed (56.3% cf. 64.0%). This re-evaluation of the nutritional value of the genetically manipulated (GM) and non-GM lupin varieties enabled the reformulation of diets on a digestible protein and energy basis. A second growth trial was undertaken using sub-satietal pair-feeding regimes, with the experiment also involving protein-restrictive diets to allow expression of the differences in the methionine content of the transgenic and nontransgenic lupin meals. A significant benefit of the enhanced methionine level in the transgenic lupin was observed. It is argued that in the high-protein fish diets used, the importance of amino acid composition is relatively limited. Economic modelling of the potential value of the increased methionine in the transgenic lupin suggests that this will have limited benefit for aquaculture industries, and that greater value would be attributable to higher protein and energy levels in ingredients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2095.2003.00247.x
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  • 9
    Digitale Medien
    Digitale Medien
    AN ORGANIZED SIGNAL IN SNOWMELT RUNOFF OVER THE WESTERN UNITED STATES (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 36 (2000), S. 0 
    Details
    ISSN: 1752-1688
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Notizen: : Daily-to-weekly discharge during the snowmelt season is highly correlated among river basins in the upper elevations of the central and southern Sierra Nevada (Carson, Walker, Tuolumne, Merced, San Joaquin, Kings, and Kern Rivers). In many cases, the upper Sierra Nevada watershed operates in a single mode (with varying catchment amplitudes). In some years, with appropriate lags, this mode extends to distant mountains. A reason for this coherence is the broad scale nature of synoptic features in atmospheric circulation, which provide anomalous insolation and temperature forcing that span a large region, sometimes the entire western U.S. These correlations may fall off dramatically, however, in dry years when the snowpack is spatially patchy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1752-1688.2000.tb04278.x
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  • 10
    Digitale Medien
    Digitale Medien
    Chelyabinsk. Environmental affairs in a Russian city (1993)
    s.l. : American Chemical Society
    Environmental science & technology 27 (1993), S. 596-600 
    Details
    ISSN: 1520-5851
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Energietechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/es00041a002
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