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21.
N. Amos M. M. Block G. J. Bobbink M. Botje J. Debaisieux D. Favart C. Leroy F. Linde P. Lipnik J. -P. Matheys D. H. Miller K. Potter C. Vander Velde-Wilquet S. Zucchelli 《Physics letters. [Part B]》1983,120(4-6)
Proton-antiproton and proton-proton elastic scattering have been measured in the four-momentum transfer range 0.001|t|0.06 GeV2 for center-of-mass energy 52.8 GeV at the CERN Intersecting Storage Rings (ISR). Using the known pp total cross section, a simultaneous fit to the p
and pp differential cross sections yields the p
total cross section; in addition, we obtain the ratio of the real-to-imaginary part of the forward nuclear-scattering amplitude and the nuclear-slope parameter for both p
and pp. Our results show conclusively that the p
total cross section is rising at ISR energies and lend support to conventional theories in which the difference between the p
and pp total cross section vanishes at very high energy. 相似文献
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We measured the neutron scattering intensities from pure liquid H2O relative to that of pure D2O and also relative to H2O-D2O mixtures, at room temperature. This study is relevant to the problem of quantum entanglement. The neutrons were generated from an electron Linac and the final energy of the scattered neutrons was fixed at 24.3 keV using a 20 cm thick pure iron filter. The scattering intensity ratios were found to agree with expected values deduced from the tabulated total cross sections within an accuracy of 3%. Thus no anomaly was observed. 相似文献
26.
The synthesis and properties of a novel class of ortho-dialkylamino-substituted semisquaraines are described. The exceptionally low reactivity of the investigated compounds is caused by an intramolecular hydrogen bond as evidenced by experimental and computational studies. Although this constitutes the reason for our failed attempts to prepare poly(m-phenylene-alt-squaraine)s, the discovered influence of hydrogen bonding on the photophysical properties of these semisquaraines provides a promising new motif for sensor design. 相似文献
27.
[reaction: see text] Treatment of 1,4-dilithio-1,3-butadiyne (1) with dichalcogenides RSSR or RSeSeR affords dithio- and diseleno-1,3-butadiynes (2, 3), perthio- and perseleno-[3]-cumulenes (4, 5), perthio- and perseleno-1,3-butadienes (6, 7), and/or perthio- and perseleno-but-1-ene-3-ynes (8, 9). The products can be controlled by stoichiometry and temperature, by the presence or absence of oxygen, and by choice of the "R" group. By X-ray crystallography, hexa(methylthio)-1,3-butadiene is highly twisted, with a torsion angle [Phi(CCCC)] of 84.7 degrees and an elongated C(2)-C(3) distance of 1.484(3) A. 相似文献
28.
Let f :X→X be a continuous map of a compact metric space to itself. We prove that f is topologically conjugate to an adding machine map if and only if X is an infinite minimal set for f and each point of X is regularly recurrent. Moreover, if X is an infinite minimal set for f and one point of X is regularly recurrent, then f is semiconjugate to an adding machine map. 相似文献
29.
Kurt Binder Benjamin Block Subir K. Das Peter Virnau David Winter 《Journal of statistical physics》2011,144(3):690-729
Excess contributions to the free energy due to interfaces occur for many problems encountered in the statistical physics of
condensed matter when coexistence between different phases is possible (e.g. wetting phenomena, nucleation, crystal growth,
etc.). This article reviews two methods to estimate both interfacial free energies and line tensions by Monte Carlo simulations
of simple models, (e.g. the Ising model, a symmetrical binary Lennard-Jones fluid exhibiting a miscibility gap, and a simple
Lennard-Jones fluid). One method is based on thermodynamic integration. This method is useful to study flat and inclined interfaces
for Ising lattices, allowing also the estimation of line tensions of three-phase contact lines, when the interfaces meet walls
(where “surface fields” may act). A generalization to off-lattice systems is described as well. The second method is based
on the sampling of the order parameter distribution of the system throughout the two-phase coexistence region of the model.
Both the interface free energies of flat interfaces and of (spherical or cylindrical) droplets (or bubbles) can be estimated,
including also systems with walls, where sphere-cap shaped wall-attached droplets occur. The curvature-dependence of the interfacial
free energy is discussed, and estimates for the line tensions are compared to results from the thermodynamic integration method.
Basic limitations of all these methods are critically discussed, and an outlook on other approaches is given. 相似文献