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  • 1
    Electronic Resource
    Electronic Resource
    A possible replacement of single crystal by melt-textured material in the study of YBa2Cu3O7−y (1992)
    Springer
    Applied physics 55 (1992), S. 514-517 
    Details
    ISSN: 1432-0630
    Keywords: 74.70 ; 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Improved superconducting properties were observed in melt-textured YBa2Cu3O7-y ceramic material. The inductive current density has a small field dependence up to 5.5 T over a wide temperature range. The field and temperature dependences of the magnetic properties are similar to the behavior found in single crystals. Values of the intragrain critical current density in melt-texture samples have the same order of magnitude as in single crystals. The reduced porosity and improved grain alignment help to probe intrinsic physical properties that depend on crystallographic orientation. Thus experiments similar to those involving single crystals are possible. The modified Bean critical state model applied to single crystals can also be used in these melt-textured samples. Thus, it is possible to use melt-textured samples in some basic research which originally required the use of single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331665
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  • 2
    Electronic Resource
    Electronic Resource
    Reduced shear stress: A major component in the ability of mammalian tissues to form three-dimensional assemblies in simulated microgravity (1993)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 51 (1993), S. 301-311 
    Details
    ISSN: 0730-2312
    Keywords: integrated rotating-wall vessel ; shear stress ; simulated microgravity ; three-dimensional tissues ; microcarriers ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: BHK-21 cells were cultured under various shear stress conditions in an Integrated Rotating-Wall Vessel (IRWV). Shear ranged from 0.5 dyn/cm2 (simulated microgravity) to 0.92 dyn/cm2. Under simulated microgravity conditions, BHK-21 cells complexed into three-dimensional cellular aggregates attaining 6 × 106 cells/ml as compared to growth under 0.92 dyn cm2 conditions. Glucose utilization in simulated microgravity was reduced significantly, and cellular damage at the microcarrier surface was kept to a minimum. Thus, the integrated rotating wall vessel provides a quiescent environment for the culture of mammalian cells. © 1993 Wiley-Liss, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240510309
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