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1999 (1)
1992 (1)
1Author    Siegfried Hess, Bin SuRequires cookie*
 Title    Pressure and Isotropic-Nematic Transition Temperature of Model Liquid Crystals  
 Abstract    The pressure in the gaseous, the isotropic liquid and nematic liquid crystalline states, as well as the isotropic-nematic transition temperature are calculated for a model system composed of non-spherical particles. The potential is a generalization of the Lennard-Jones interaction where the attractive part depends on the relative orientations of the particles and the vector joining their centers of mass. Point of departure is an augmented van der Waals approach. It involves a modified Carnahan-Starling expression associated with the repulsive part of the interaction, and an orientation dependent second virial coefficient, as well as the orientational distribution functions of a pair of particles, linked with the attractive part of the potential. In a high temperature approximation, and for a special choice of model parameters, results are presented and displayed graphically. 
  Reference    Z. Naturforsch. 54a, 559—569 (1999); received June 1 1999 
  Published    1999 
  Keywords    Nematic Liquid Crystal, Interaction Potential, Equation of State 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0559.pdf 
 Identifier    ZNA-1999-54a-0559 
 Volume    54 
2Author    S. A. Lifits, S. I. Anisimov, J. Meyer-Ter-VehnRequires cookie*
 Title    Shock Waves produced by Impulsive Load: Equation of State Effects  
 Abstract    A numerical study of the flow after impulsive load of a plane material surface is carried out. It is shown that the flow is asymptotically self-similar provided one can neglect the cold components in the equation of state. In this case the effective exponent s(r) = d ln(Xs)/d ln(r), derived from the shock trajectory X s (t) does not depend on the initial pressure pulse and approaches the exponent a of the self-similar problem for time t-* oo. For equations of state containing a cold pressure term, s (r) is larger than a and changes non-monotonically with time. Some features of the flow related to the presence of cold components in pressure and internal energy are discussed. 
  Reference    Z. Naturforsch. 47a, 453—459 (1992); received September 9 1991 
  Published    1992 
  Keywords    Shock wave, Impulsive load, Equation-of-state, High pressure, Self-similar flow 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0453.pdf 
 Identifier    ZNA-1992-47a-0453 
 Volume    47