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  • CHEMISTRY AND MATERIALS (GENERAL)  (1)
  • Ellipsoid method  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Simplices by point-sliding and the Yamnitsky-Levin algorithm (1997)
    Springer
    Mathematical methods of operations research 46 (1997), S. 131-142 
    Details
    ISSN: 1432-5217
    Keywords: Ellipsoid method ; linear programming ; simplex ; volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Yamnitsky and Levin proposed a variant of Khachiyan's ellopsoid method for testing feasibility of systems of linear inequalities that also runs in polynomial time but uses simplices instead of ellipsoids. Starting with then-simplexS and the half-space {x¦a Tx ≤ β}, the algorithm finds a simplexS YL of small volume that enclosesS ∩ {x¦a Tx ≤ β}. We interpretS YL as a simplex obtainable by point-sliding and show that the smallest such simplex can be determined by minimizing a simple strictly convex function. We furthermore discuss some numerical results. The results suggest that the number of iterations used by our method may be considerably less than that of the standard ellipsoid method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01199467
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    Paper (German National Licenses)
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  • 2
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    Titanium dioxide antireflection coating for silicon solar cells by spray deposition (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A high-speed production process is described for depositing a single-layer, quarter-wavelength thick antireflection coating of titanium dioxide on metal-patterned single-crystal silicon solar cells for terrestrial applications. Controlled atomization spraying of an organotitanium solution was selected as the most cost-effective method of film deposition using commercial automated equipment. The optimal composition consists of titanium isopropoxide as the titanium source, n-butyl acetate as the diluent solvent, sec-butanol as the leveling agent, and 2-ethyl-1-hexanol to render the material uniformly depositable. Application of the process to the coating of circular, large-diameter solar cells with either screen-printed silver metallization or with vacuum-evaporated Ti/Pd/Ag metallization showed increases of over 40% in the electrical conversion efficiency. Optical characteristics, corrosion resistance, and several other important properties of the spray-deposited film are reported. Experimental evidence indicates a wide tolerance in the coating thickness upon the overall efficiency of the cell. Considerations pertaining to the optimization of AR coatings in general are discussed, and a comprehensive critical survey of the literature is presented.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: RCA Review; 41; June 198
    Format: text
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    NASA TECHNICAL REPORTS
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