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  • 05 B 35  (1)
  • CHEMISTRY AND MATERIALS (GENERAL)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Matroid matching in pseudomodular lattices (1989)
    Springer
    Combinatorica 9 (1989), S. 145-152 
    Details
    ISSN: 1439-6912
    Keywords: 05 B 35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The matroid matching problem (also known as matroid parity problem) has been intensively studied by several authors. Starting from very special problems, in particular the matching problem and the matroid intersection problem, good characterizations have been obtained for more and more general classes of matroids. The two most recent ones are the class of representable matroids and, later on, the class of algebraic matroids (cf. [4] and [2]). We present a further step of generalization, showing that a good characterization can also be obtained for the class of socalled pseudomodular matroids, introduced by Björner and Lovász (cf. [1]). A small counterexample is included to show that pseudomodularity still does not cover all matroids that behave well with respect to matroid matching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02124676
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    Paper (German National Licenses)
    Fulltext
  • 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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