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  • 2000-2004  (5)
  • 2000  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Structure and discrimination in chiral fluids: A molecular dynamics and integral equation study (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 2369-2384 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An analysis of structure and discrimination in simple chiral fluids is presented. The chiral molecules consist of a central carbon bonded to four distinct groups. Molecular-dynamics simulations have been performed on a one-component chiral fluid and on two racemic mixtures. For the racemates, discrimination, as measured by differences in pair distribution functions, is present but found to be small. Intermolecular pair interaction energies are found to be good predictors of the magnitude and the sign (mirror-image pairs favored) of the differences observed in site–site distribution functions. For the one-component fluid, the quality of structural predictions from the reference-interaction-site method and Chandler–Silbey–Ladanyi (CSL) integral equation theories, with the hypernetted chain (HNC) and Percus–Yevick closures, has been examined. These theories generally provide a qualitatively correct description of the site–site distributions. Extensions beyond the HNC level have been explored: Two-field-point bridge diagrams have been explicitly evaluated and included in the CSL theory. The inclusion of these diagrams significantly improves the quality of the integral equation theories. Since the CSL theory has not been used extensively, and bridge diagrams have been evaluated in only a few instances, a detailed analysis of their impact is presented. For racemic mixtures, diagram evaluation is shown to be crucial. Specifically, the differences in site–site distributions for sites on identical and mirror-image molecules are found to originate from bridge diagrams which involve interactions between four-site, or larger, clusters. Discrimination cannot be predicted from an integral equation theory which neglects these diagrams. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.482052
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Satake diagrams and Iwasawa decomposition of twisted Kac–Moody algebras (2000)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 41 (2000), S. 7817-7831 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The involutive automorphism of twisted Kac–Moody algebras of A2(2) and D4(3) are computed from the Satake diagrams of these algebras, which are then used to furnish a general procedure of their Iwasawa decomposition. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288244
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  • 3
    Electronic Resource
    Electronic Resource
    Novel template-based semiconductor nanostructures and their applications (2000)
    Springer
    Applied physics 71 (2000), S. 681-688 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 07.07.Df; 81.05.Zx; 85.30.Vw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. In this paper we present a novel template-based technology for the fabrication of large, periodic arrays of semiconductor nanostructures that is inexpensive, reliable, suitable for the fabrication of a variety of semiconductors, and is compatible with the standard CMOS process. The technique uses material growth on a preformed template formed by electrochemical etching (anodization) of a thin film of aluminum deposited on an arbitrary substrate. The template contains a periodic array of pores in which the nanostructure materials are synthesized. The nanostructure size and periodicity can be controlled by controlling the anodization conditions. We are currently using this fabrication technique to develop a variety of optoelectronic devices, brief descriptions of which are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000450
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  • 4
    Electronic Resource
    Electronic Resource
    Fabrication and characterization of microwave sintered β′′-Al2O3 tubes (2000)
    Springer
    Journal of materials science 19 (2000), S. 1119-1121 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006738605323
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Anion Doping on the Thermal Decomposition of Potassium Bromate (2000)
    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 879-883 
    Details
    ISSN: 1572-8943
    Keywords: anion doping ; defects ; isothermal decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Structural defects were introduced into the potassium bromate (PB) lattice in the form of SO2− 4 and Cl− ions in the process of crystal growth. It was assumed that these doped crystals PB(Cl−) and PB(SO2− 4) are composed of a two phase system, one being the perfect PB lattice and the other distorted regions due to induced defects. Isothermal decomposition of doped and normal PB samples was carried out gasometrically between the temperature range 653–663 K. The α-t plots reveal that the process occurs through initial gas evolution, acceleratory and decay stages. It also confirmed that doping enhances the rate of the reaction, the effect being more pronounced in the case of PB(SO2− 4). The data are found to be well fitted to the Prout-Tompkins and Avrami-Erofe'ev mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010194508160
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