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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of YBa2Cu3O7−δ films from separate oxide targets (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 287-289 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Synthesis of YBa2Cu3O7−δ (YBCO) has been achieved using laser ablation of separate oxide targets YBa2Ox and CuO, as well as Y2Cu2O5 and BaCuO2. Results obtained using two synchronized lasers to ablate from the two targets show that high quality epitaxial YBCO films can be obtained independent of the laser pulse delay settings. The facile formation of the YBCO phase, irrespective of the nature of the reacting precursors, points to its high thermodynamic stability under conditions used for in situ growth of films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352132
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of Bi-Sr-Ca-Cu-O thick film rf SQUIDs at liquid nitrogen temperatures (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1172-1174 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Periodic oscillations in the V-Φ characteristics have been observed up to 97 K in radio frequency SQUIDs fabricated from screen printed Bi-Sr-Ca-Cu-O thick films. The SQUID has been operated successfully in the flux-locked-loop mode at 77 K. Stability of the SQUID output and its noise performance have been found to improve considerably when the SQUID is operated in the flux-locked-loop mode as compared to that in the open-loop mode. The spectral noise density, in the white noise region, is 5×10−4 Φ0/(square root of)Hz at 77 K for the flux-locked-loop mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351796
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  • 3
    Electronic Resource
    Electronic Resource
    Critical current of a high Tc Josephson grain boundary junction in high magnetic field (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1355-1357 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The critical current (Ic) of YBa2Cu3O7−δ grain boundary Josephson junctions was measured up to magnetic fields of 5 T. Magnetic field history dependent Ic values were observed even after correction for self-field effects stemming from hysteretic shielding currents in the grain adjacent to the boundary. A novel feature observed is an anomalous increase in Ic in high magnetic fields of several Telsa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107590
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  • 4
    Electronic Resource
    Electronic Resource
    Improved laser-ablated thin films of NdCeCuO by use of N2O (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2715-2717 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of the electron-doped superconductor Nd1.85Ce0.15CuO4−δ were prepared by laser ablation in O2 and N2O ambients. Although films prepared in an O2 ambient need to be reduced to become superconducting, the use of a lower oxygen pressure during deposition produces inferior films. A more metallic character can be obtained by increasing the O2 pressure during deposition. The substitution of N2O for O2 results in films that are superconducting without a separate reduction step, with a sharp transition at about 16 K. A short vacuum anneal at the deposition temperature yields reproducible films with Tc=20 K, without change in the transition width.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108070
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  • 5
    Electronic Resource
    Electronic Resource
    Layer-by-layer deposition of La1.85Sr0.15CuOx films by pulsed laser ablation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 3045-3047 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Reflection high-energy electron diffraction (RHEED) has been used to monitor the growth of La1.85Sr0.15CuOx (LSCO) thin films on (100) SrTiO3 substrates by pulsed laser deposition. The films are grown using a combination of pulsed molecular oxygen and a continuous source of atomic oxygen, with the average background pressure maintained as low as 1 mTorr. The RHEED pattern is sharp and streaky, and the intensity of the specular beam oscillates during the deposition, indicating a two-dimensional layer-by-layer epitaxial growth. The film thickness measured by x-ray small-angle interference is consistent with the thickness determined by the RHEED oscillation period with a growth unit of half a unit cell. Thin films of YBa2Cu3O7−δ (YBCO) with good RHEED oscillations have also been grown under similar oxygenation conditions. The low-pressure-grown LSCO and YBCO films are superconducting, with zero-resistance temperatures of 15 and 80 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106778
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic Analysis of Resistance to Xanthomonas campestris pv. oryzae (Ishiyama) Dye in a Rice Breeding Line ARC 10464 (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 108 (1992), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The genetics of resistance to three Indian pathotypes of Xanthomonas campestris pv. oryzae, namely, IX01, IX08 and IX09, was studied in a landrace of Indica rice ‘ARC 10464’. Resistance to each of the two pathotypes IX01 and IX09 was governed by two independently-inherited dominant genes while a single dominant gene was operative against patho-type 1X08. The joint segregation tests conducted on F2 plant progenies (F3 families) using pathotypes IX01, IX08 and IX09 suggested that the gene/(s) effective against each of the pathotypes are different.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1992.tb00141.x
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  • 7
    Electronic Resource
    Electronic Resource
    Extracellular and mycelial amylases of the thermophilic fungus Malbranchea sulfurea (1992)
    Springer
    Mycopathologia 119 (1992), S. 77-82 
    Details
    ISSN: 1573-0832
    Keywords: α-amylase ; α-glucosidase ; extracellular ; membrane bound ; thermophile ; fungus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The thermophilic fungus Malbranchea sulfurea produces extracellular α-amylase whereas α-glucosidase is mainly cell bound. Extraction of the cell bound enzyme was maximum with one molar NaCl, followed by Triton ×100 and Urea-Na2SO3 extractants. Supplementation of Triton ×100 in growth medium significantly affected the presence of enzymes at various locations. A role for cell bound α-amylase and α-glucosidase has been suggested in rapid starch utilization by the fungus during early growth phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443937
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  • 8
    Electronic Resource
    Electronic Resource
    Pore formation in cast metals and alloys (1992)
    Springer
    Journal of materials science 27 (1992), S. 853-862 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Porosity occurs in cast solidifying metals and alloys due to negative pressures generated during solidification contraction, and pressure developed by gases dissolved in the motten metal. Both the above processes may act either together or separately to produce such shrinkage or gas defects (collectively termed pores). They are generally unwanted and constitute a major industrial problem. This paper is an attempt to review up-to-date knowledge of the conditions of pore formation in cast metals and alloys. Various mechanisms responsible for pore nucleation and growth are summarized, and experimentally evaluated using an unfed type of mould with aluminium alloy castings. The observations are in support of a non-nucleation mechanism of pore formation playing a major role in the occurrence of such defects in cast metals. Further, in gas-containing alloy melts the critical amounts of gas required for single and multiple pore nucleation have been determined quantitatively and are listed in the text. The gas contents of the melts were measured using an apparatus based on the “first bubble technique”. It is also experimentally observed that under poor feeding conditions more than one of the non-classical nucleation mechanisms may be functional at the same time for the formation of such defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197634
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  • 9
    Electronic Resource
    Electronic Resource
    Hydromagnetic stability of a stratified parallel flow varying in two directions (1992)
    Springer
    Astrophysics and space science 198 (1992), S. 95-100 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of a stratified parallel flow varying in two directions of an incompressible conducting fluid permeated by a uniform aligned magnetic field is investigated. Complex wave speed of an unstable mode lies in the upper half of a semi-circle whose diameter decreases with increasing magnetic field. It is also found that a strong enough magnetic field can completely stabilize flows with unstable density stratification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644303
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  • 10
    Electronic Resource
    Electronic Resource
    Solid state reaction in iron-silicon multilayers (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 627-630 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid state reaction in Fe−Si multilayers occuring at 300°C and 385°C has been studied using Mössbauer spectroscopy and RBS measurements. Annealing at 300°C results in partial amorphization of the system, while annealing at 385°C results in formation of crystalline phases. Possible mechanism for amorphization has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401905
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