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161.
J.N. Carney D.C. Colley M.F. James M. Jobes G.T. Jones J.B. Kinson K.M. Storr D.C. Watkins D.D. Johnson P. Peeters F. Verbeure C. Ciapetti W. Dunwoodie Y. Goldschmidt-Clermont A. Grant F. Muller J. Quinquard Z. Sekera D. Vignaud 《Physics letters. [Part B]》1975,55(1):117-120
We present the first spin-parity analysis of the K+K+K?) system produced in the reaction K+p → K+K+K?p, and show that the general features of this system resemble those of the (ππ+π?) and Kπ+π?) systems produced in the reactions π(K)p → π(K)π+π?p. There is a low mass enhancement, (47 ± 11)% of which corresponds to 1+ states decaying to Kø. At higher (K+K+K?) masses 2? → Kf′ becomes increasingly significant and at all masses there is a 0? contribution of roughly 30%. 相似文献
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F. M. Peeters B. Partoens V. A. Schweigert G. Goldoni 《Physica E: Low-dimensional Systems and Nanostructures》1998,1(1-4)
The ground-state configurations and spectrum of two parallel two-dimensional classical atoms are obtained as a function of the inter-atomic distance (
). The classical particles are confined by parabolic potentials and repel each other through a Coulomb potential. As a function of
we find several configurational transitions which are of first or second order. For first- (second-) order transitions the first (second) derivative of the energy with respect to
is discontinuous, the radial position of the particles changes discontinuously (continuously) and the frequency of the eigenmodes exhibit a jump (softening of a mode). In the limit of an infinite number of electrons the Wigner bilayer system is recovered which moves through five different stable crystalline phases as a function of
. For unequal strength of parabolic confinement we find that the number of configurational transitions increases. 相似文献
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Anne Peeters Lutgarde Buydens Desire L. Massart P. J. Schoenmakers 《Chromatographia》1988,26(1):101-109
Summary Systematic procedures for the optimization of chromatographic selectivity require objective criteria to characterize the quality of separation in a chromatogram. Numerous criteria have been suggested. Different criteria yield different results and the choice will depend on a large number of factors. It is genuinely difficult to select the most suitable criterion in a particular situation. For these reasons, an expert system has been developed to assist chromatographers in the selection of optimization criteria. A structured representation of the required knowledge and its implementation in an expert-system shell are presented in this paper. 相似文献