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  • 1990-1994  (201)
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  • 1
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    A fast recursive algorithm for the discrete sine transform (1990)
    In:  IEEE Trans. on Signal Processing, Bonn, Inst. f. Theoret. Geodäsie, vol. 38, no. 11, pp. 553-556, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1990
    Keywords: Transformations ; Filter-
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Superconducting mercury-based cuprate films with a zero-resistance transition temperature of 124 Kelvin (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-03-04
    Description: The synthesis of high-quality films of the recently discovered mercury-based cuprate films with high transition temperatures has been plagued by problems such as the air sensitivity of the cuprate precursor and the volatility of Hg and HgO. These processing difficulties have been circumvented by a technique of atomic-scale mixing of the HgO and cuprate precursors, use of a protective cap layer, and annealing in an appropriate Hg and O(2) environment. With this procedure, a zero-resistance transition temperature as high as 124 kelvin in c axis-oriented epitaxial HgBa(2)CaCu(2)O(6+delta) films has been achieved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tsuei, C C -- Gupta, A -- Trafas, G -- Mitzi, D -- New York, N.Y. -- Science. 1994 Mar 4;263(5151):1259-61.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17817429" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Mercury-Based Cuprate High-Transition Temperature Grain-Boundary Junctions and SQUIDs Operating Above 110 Kelvin (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-08-19
    Description: The superconducting transport characteristics of HgBa(2) CaCu(2)O(6+delta) (Hg-1212) films and grain-boundary junctions grown on (100)-oriented SrTiO(3) bicrystal substrates have been investigated. The films exhibit a zero-resistance temperature of approximately 120 kelvin and sustain large critical current densities, with values as high as 10(6) amperes per square centimeter at around 100 kelvin. On the other hand, the grain boundaries behave as weak links, with substantially lower critical currents, as is observed for other cuprate superconductors. A reduction of three orders of magnitude in critical current was observed for transport across a 36.8 degrees grain boundary. The current-voltage characteristics of bridges across such a grain boundary show weak-link behavior qualitatively resembling that of a resistively shunted junction. Single-level direct-current superconducting quantum interference devices (SQUIDs) have been fabricated with such bicrystal junctions. These SQUIDs show clear periodic voltage modulations when subjected to applied magnetic fields. The SQUIDs operate at temperatures as high as 111.8 kelvin, which makes them attractive for operation in portable sensors and devices that utilize nonconventional cooling methods.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gupta, A -- Sun, J Z -- Tsuei, C C -- New York, N.Y. -- Science. 1994 Aug 19;265(5175):1075-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17832899" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Novel solid-phase epitaxial growth of YBa2Cu3O7−δ films from precursor oxides (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2807-2816 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pulsed laser deposition technique has been used to study the process of layering and intermixing of precursor oxide phases of YBa2Cu3O7−δ (YBCO) during deposition from separate component targets. The films are grown on (100)-oriented SrTiO3 substrates by ablation from the component targets YBa2Ox/CuO or Y2Cu2O5/BaCuO2 under process conditions similar to those needed for the growth of YBCO films from a composite target. For precursor oxide layers below a critical thickness, which can be as large as 1000 A(ring), facile formation of high-quality epitaxial YBCO films is observed resulting from interdiffusion and reaction of the constituent phases. On the other hand, while some degree of intermixing occurs above the critical thickness, there is no evidence of formation of the YBCO phase. The novel solid-phase epitaxy observed below the critical thickness is believed to result from diffusion of species through grain boundaries of the initial precursor oxide layer, followed by reaction at the substrate interface to epitaxially nucleate the YBCO layers. The process continues until all of the initial oxide layer is consumed and can be repeated with deposition of subsequent alternate layers. The dynamics of the diffusion process has been investigated using in situ resistance measurements to monitor the growth of the YBCO phase. The results show that the time scale for interdiffusion and reaction is very rapid (∼10–100 ms), and occurs soon after arrival of the ablated species from the second component target on the surface of the initial precursor oxide layer. These results have important implications for the choice of component oxide blocks for layer-by-layer growth of artificially structured films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357515
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  • 5
    Electronic Resource
    Electronic Resource
    Ionic hydration and water sorption isotherms of ion exchange resins (1993)
    s.l. : American Chemical Society
    Langmuir 9 (1993), S. 1786-1793 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00031a029
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Imaging high-temperature superconducting films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7178-7181 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magneto-optically active glass, Ce(PO3)3, was used to image field penetration into three superconducting films of YBa2Cu3O7 that were laser ablated on (100)-oriented SrTiO3 substrates. The magnetic-field profile in these films was mapped using the Faraday effect in an external field of 92 mT for two of the films and 181 mT for the third film. These contours show regions where flux had easily penetrated, indicating weak pinning, and other regions that were strongly pinning. From the measured field gradients, it was determined that Jc varies by at least an order of magnitude across the surface of the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347610
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  • 8
    Electronic Resource
    Electronic Resource
    Role of bubbles in laser-assisted wet etching (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2851-2853 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Evidence is presented to explain laser-based aqueous salt etching in terms of vapor bubble growth conditions at the irradiated surface of a substrate. The effect of pulse and frequency modulation of a cw laser is investigated to determine growth behavior for adhering bubbles in pure water. The role of salt in solution (such as KOH, NaOH, or CaCl2) is discussed in terms of its function as a diffusion barrier for growing vapor bubbles. Etching data are presented for the case of a Cu-vapor laser applied to a Mn-Zn-ferrite substrate, comparing results with and without KOH in the etching solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104756
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  • 9
    Electronic Resource
    Electronic Resource
    Submicron YBa2Cu3O7−δ grain boundary junction dc SQUIDs (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2555-2557 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and measured the properties of micron-size single grain boundary junctions and dc superconducting quantum interference devices (SQUIDs). The width of the junctions was varied between 0.25 and 2 μm. The junctions were formed in c-axis oriented epitaxial films with a single 24° tilt boundary. They were fabricated using electron beam lithography and ion milling. All of the junctions operate at 77 K. The noise properties of SQUIDs made of these junctions have been characterized. They show a significant 1/f component which is comparable to published values. However, the white noise level, 3×10−31 J/Hz measured at 77 K, is the lowest ever reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104824
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  • 10
    Electronic Resource
    Electronic Resource
    Crack formation in epitaxial [110] thin films of YBa2Cu3O7−δ and PrBa2Cu3O7−x on [110]SrTiO3 substrates (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1682-1684 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A characteristic feature of epitaxial [110] thin films of YBa2Cu3O7−δ and PrBa2Cu3O7−x on [110]SrTiO3 substrates is that the films have a tendency to crack along the (001) planes. We have studied the crack spacing as a function of deposition temperature and film thickness. The experimental data have been found to be in excellent agreement with a theoretical analysis of the crack spacings in brittle films. The study has allowed us to determine the critical thickness below which no cracks are expected to form as a function of temperature for [110] films of YBa2Cu3O7−δ, PrBa2Cu3O7−x, and YBa2Cu3O7−δ/ PrBa2Cu3O7−x bilayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105110
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