 143  Author
 B. Baranowski, A. Lundén  Requires cookie*   Title
 An Explanation of the Removal of Metastability in Some Hydroacid Salts by Water Adsorption    Abstract
 The metastability of some phases of C sH S04 and RbH2P 0 4 is due to the volume decrease at an endothermic phase transition which "locks in" the metastability in question. Water adsorption, which removes these metastabilities, probably exerts a "wedgelike" force which expands the lattice spacing in the surface layer, thus facilitating the start of the phase transition. The induction time and the zeroth order kinetics of the transition in RbH2P 0 4 are exponential functions of the water activity applied.   
Reference
 Z. Naturforsch. 56a, 869—872 (2001); received October 31 2001   
Published
 2001   
Similar Items
 Find   DEBUG INFO
    TEIXML for
 default:Reihe_A/56/ZNA200156a0869.pdf    Identifier
 ZNA200156a0869    Volume
 56  
144  Author
 Prasad Durga, Devesh Ojha, V.G K M Kumar, Pisipati  Requires cookie*   Title
 Smectogenic Behaviour of 70.6 at it's Phase Transition Temperature: A Computational Analysis Reprint request to    Abstract
 A computational analysis has been carried out to determine the configurational preference of a pair of Ar(4nheptyloxybenzylidine)4hexylaniline (70.6) molecules with respect to translatory and orien tational motions. The CNDO/2 method has been employed to evaluate the net atomic charge and atom ic dipole components at each atomic centre of the molecule. The configurational energy has been com puted using the modified RayleighSchrödinger perturbation method. The obtained energies were used to calculate the probability of each configuration at phase transition temperature, using MaxwellBoltzmann's formula. The flexibility of various configurations has been studied in terms o f variations of the probability due to small departures from the most probable configuration. The results are discussed in the light of experimental as well as other theoretical observations. The smectogenic character of the molecule has been correlated with the parameters introduced in this paper.   
Reference
 Z. Naturforsch. 56a, 873—878 (2001); received October 12 2001   
Published
 2001   
Keywords
 706, CNDO/2 Method, Quantum Chemistry, Computer Simulation   
Similar Items
 Find   DEBUG INFO
    TEIXML for
 default:Reihe_A/56/ZNA200156a0873.pdf    Identifier
 ZNA200156a0873    Volume
 56  
145  Author
 Goong Chen, Zijian Diao  Requires cookie*   Title
 Quantum Multiobject Search Algorithm with the Availability of Partial Information    Abstract
 Consider the unstructured search of an unknown number I of items in a large unsorted database of size N. The multiobject quantum search algorithm consists of two parts. The first part of the algorithm is to generalize Grover's singleobject search algorithm to the multiobject case, and the second part is to solve a counting problem to determine /. In this paper we study the multiobject quantum search algorithm (in continuous time), but in a more structured way by taking into account the availability of partial informa tion. The modeling of available partial information is done simply by the combination o f several pre scribed, possibly overlapping, information sets with varying weights to signify the reliability of each set. The associated statistics is estimated and the algorithm efficiency and complexity are analyzed. Our analysis shows that the search described here may not be more efficient than the unstructured (generalized) multiobject Grover search if there is "misplaced confidence". However, if the informa tion sets have a "basic confidence" property in the sense that each information set contains at least one search item, then a quadratic speedup holds on a much smaller data space, which further expedites the quantum search for the first item.   
Reference
 Z. Naturforsch. 56a, 879—888 (2001); received September 18 2001   
Published
 2001   
Similar Items
 Find   DEBUG INFO
    TEIXML for
 default:Reihe_A/56/ZNA200156a0879.pdf    Identifier
 ZNA200156a0879    Volume
 56  
146  Author
 F. W. Interberg  Requires cookie*   Title
 GammaRay Bursters and Lorentzian Relativity    Abstract
 In the dynamic interpretation of relatively by Lorentz and Poincare, Lorentz invariance results from real physical contractions of measuring rods and slower going clocks in absolute motion against an ether. As it was shown by Thirring, this different interpretation of special relativity can be extended to gener al relativity, replacing the nonEuclidean with a Euclidean geometry, but where rods are contracted and clocks slowed down. In this dynamic interpretation of the special, (and by implication of the general) theory of relativity, there is a balance of forces which might be destroyed near the Planck energy, reached in approaching the event horizon. In gravitational collapse, the event horizon appears first at the center of the collapsing body, thereafter moving radially outward. If the balance of forces holding together ele mentary particles is destroyed near the event horizon, all matter would be converted into zero rest mass particles which could explain the large energy release of gamma ray bursters.   
Reference
 Z. Naturforsch. 56a, 889—892 (2001); received August 29 2001   
Published
 2001   
Similar Items
 Find   DEBUG INFO
    TEIXML for
 default:Reihe_A/56/ZNA200156a0889.pdf    Identifier
 ZNA200156a0889    Volume
 56  
147  Author
 A. K. Urbatov, P. Janik, A. D. Ro, ZdR Zo Sk, S.J R Zo Sk, M. Paluch, P. M. Alik, J. Z. Io Ło, J. Ja  Requires cookie*   Title
 Universal Scaling of Alpha Relaxation in Complex Liquids    Abstract
 A plot is given, showing the result of a scaling analysis of dielectric loss curves containing, apart from low molecular glass former data (glycerol, dibutyl phtalate), also loss curves of the following liquid crystalline materials, mostly in the iso tropic phase: 4(2methylbutyl)4'cyanobiphenyl (5*CB, supercooled isotropic phase), 4cyano4nalkyl biphenyls (nematogens 5CB and 8CB, isotropic phase), 4(4cyano4butylcyclohexyl)4'octylbiphenyl (laterally substituted nematogen, isotropic phase), and 4nalkyl4'isothiocyanatobiphenyl (5 and 10 BT, isotropic and SmE phases). The plot applies the scaling formula originally proposed for glassforming, super cooled liquids [Dendzik et al.7]. The result supports the recent suggestion that dielectric relaxation in the isotropic phase of nematogens may show some features typical for "glassy" mate rials.   
Reference
 Z. Naturforsch. 56a, 893—894 (2001); received September 21 2001   
Published
 2001   
Keywords
 Complex Liquids Supercooled Liquids, Liquid Crystals, Dielectric Loss Curves, Universality   
Similar Items
 Find   DEBUG INFO
    TEIXML for
 default:Reihe_A/56/ZNA200156a0893_n.pdf    Identifier
 ZNA200156a0893_n    Volume
 56  
