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  • Springer  (5)
  • American Chemical Society (ACS)
  • eLife Sciences Publications
  • 2015-2019
  • 1995-1999  (5)
  • 1935-1939
  • 1999  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Breakthrough advances in low loss, tunable dielectric materials (1999)
    Springer
    Materials research innovations 2 (1999), S. 278-282 
    Details
    ISSN: 1433-075X
    Keywords: Key words Ferroelectrics ; Phased array antenna ; Tunable devices ; Thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Low loss, tunable dielectric materials are important for phased array antenna and other device applications. Various composites of barium strontium titanium oxide (BSTO) combined with other nonelectrically active oxide ceramics have been formulated for such uses. The dielectric constant and the loss tangents of these composites have been reduced to enhance the overall impedance matching and thereby lowering the overall insertion loss of the device. The material has been fabricated in bulk ceramic, thick film, and thin film form to address a broad range of frequency applications. The material fabrication methods and the electronic properties of these composites will be discussed in this article.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100190050098
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, physico-chemical and antimicrobial studies on acetylferrocenyl hydrazone derivatives of dichlorobis(cyclopentadienyl)hafnium(IV) (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 703-707 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reactions of Cp2〉HfCl2〉 with hydrazones (LH) derived from acetylferrocene and aromatic acid hydrazides (benzoic, 2-chlorobenzoic, 3-nitrobenzoic and 4-toluic) in various stoichiometric ratios have been studied and the complexes of the types [Cp2〉Hf(L)Cl] and [CpHf(L)3〉] were obtained. Tentative structural conclusions are drawn for the reaction products based upon elemental analyses, electrical conductance, magnetic moment and spectral data (u.v.–vis, i.r., 1〉H-n.m.r. and 13〉C-n.m.r.). Studies were conducted to assess the growth-inhibiting potential of the complexes synthesized, and the ligands, against various fungal and bacterial strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006934801730
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  • 3
    Electronic Resource
    Electronic Resource
    CO oxidation catalyzed by Cu‐exchanged zeolites: a density functional theory study (1999)
    Springer
    Catalysis letters 61 (1999), S. 179-186 
    Details
    ISSN: 1572-879X
    Keywords: CO oxidation ; Cu‐ZSM‐5 ; zeolites ; DFT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic oxidation of CO by Cu‐exchanged high‐silica zeolites (e.g., ZSM‐5) has been investigated theoretically using density functional theory. Calculations reveal two distinct, parallel pathways for oxidation of CO: (i) adsorption of O2= on a reduced Cu site followed by O atom abstraction by CO, and (ii) adsorption of CO followed by its reaction with O2= to form a cyclic compound which decomposes to form CO2=. The reduced site is regenerated via two different pathways, both of which involve oxidation of one or more CO molecules: (i) abstraction of atomic oxygen by CO from the oxidized active site, and (ii) formation of a carbonate species followed by its reaction with a molecule of CO. The relevance of these reactions to the reduction of NO is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019053729010
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the interaction of DL-methionine with cis-diaquaethylenediamine platinum(II) perchlorate in aqueous medium (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 59-63 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The kinetics of the interaction of DL-methionine with [Pt(en)(H2O)2]2+ have been studied spectrophotometrically as a function of [Pt(en)(H2O)22+], [DL-methionine], PH and temperature. The reaction proceeds via a rapid outer sphere association followed by two slow consecutive steps having first order dependence on the aqua ion and methionine concentrations. Activation parameters have been evaluated using the Eyring equation. The low ΔH1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006993423954
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  • 5
    Electronic Resource
    Electronic Resource
    Choice rules with fuzzy preferences: Some characterizations (1999)
    Springer
    Social choice and welfare 16 (1999), S. 259-272 
    Details
    ISSN: 1432-217X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract. Consider an agent with fuzzy preferences. This agent, however, has to make exact choices when faced with different feasible sets of alternatives. What rule does he follow in making such choices? This paper provides an axiomatic characterization of a class of binary choice rules called the α satisfying rule. When α=1, this rule is the Orlovsky choice rule. On the other hand, for α≤1/2, the rule coincides with the M α rule that has been extensively analyzed in the literature on fuzzy preferences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003550050143
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