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31.
We have studied the peak effect (PE) phenomenon in single crystals of weakly pinned superconductors CeRu2 and 2H-NbS2. 2H-NbS2 is iso-structural and iso-electronic to 2H-NbSe2, whose similarity with CeRu2 as regards the PE representing the order-to-disorder transformation of the flux line lattice was claimed some time ago. We
report on the step change in equilibrium magnetization across the peak effect in CeRu2. We also present the vortex phase diagram of 2H-NbS2 obtained from the magnetization data, and compare the PE phenomenon in 2H-NbS2 and 2H-NbSe2. 相似文献
32.
33.
We derive, in model-independent way, the spin structure of the matrix element for the reaction of associative Θ+-pentaquark production, π
± + d → Θ+ + Σ±, in the threshold region and in collinear kinematics. The expressions for the polarization observables in this reaction are
found assuming spin 1/2 and different parities for Θ+. We have proved that such a reaction can be used for a model-independent determination of the P parity of Θ+ only by measuring the Θ+ polarization. Other polarization observables, such as the dependence of the Σ± polarization on the vector and tensor deuteron polarizations, are insensitive to the Θ+ parity under the considered kinematical conditions. The linear and quadratic relations between polarization observables in
(Θ+ is unpolarized) do not depend on the parity of the Θ+ pentaquark. The analysis performed for this reaction is also applicable without any modification to the reaction K
+ + d → Θ+ + p. Using the pole model for the reaction mechanism, we estimated the value of the cross section for the reaction K
+ + d → Θ+ + p near the threshold.
The text was submitted by the authors in English. 相似文献
34.
A. S. Batsanov Yu. T. Struchkov A. A. Gakh A. A. Fainzil'berg 《Russian Chemical Bulletin》1994,43(4):588-590
An X-ray structural study of 2,5-bis(fluorodinitromethyl)-1,3,4-oxadiazole (1), one of the representatives of azoles with strong electron-withdrawing substituents, has been carried out. It has been found that in the orthorhombic modification of1 the conformations of the fluorodinitromethyl groups are different. Intermolecular contacts in the crystal are realized through the heterocycles arranged at large angles to each other. The presence of strong electron-withdrawing substituents results in shortening of the C-O bonds and in a certain increase in the OCN angle in the 1,3,4-oxadiazole ring.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 639–641, April, 1994. 相似文献
35.
The model-independent leading radiative corrections to polarization observables in semi-inclusive longitudinally polarized electron-nucleus scattering with the registration of a produced hadron and scattered electron in coincidence were calculated using the Drell-Yan representation in electrodynamics. The cases of a tensor-polarized target or a produced hadron with tensor polarization were considered. The exclusive process of the electrodisintegration of a polarized deuteron was also studied. 相似文献
36.
Zlotin SG Kislitsin PG Samet AV Serebryakov EA Konyushkin LD Semenov VV Buchanan AC Gakh AA 《The Journal of organic chemistry》2000,65(25):8430-8438
Reactions of 1-R-2,4,6-trinitrobenenes (R = alkyl, protected aldehyde, aminocarbonyl, cyano groups, or isoxazole ring) with thiol salts were investigated. In most cases, these reactions gave a mixture of minor para and major ortho substitution products. Reactions of N,N-disubstituted 2,4,6-trinitrobenzamides with S-,O-, and N-nucleophiles afforded products of substitution of the p-nitro group exclusively. 1-Cyano-2,4,6-trinitrobenzene was found to be the most reactive and the least selective: all three nitro groups can be substituted using an excess of thiol salts. 2-R-4, 6-dinitrobenzamides showed no regioselectivity under similar conditions to yield 1:1 mixtures of para and ortho isomers. 相似文献
37.
Burkhanov A. I. Kudashev A. S. Shil’nikov A. V. Zakharchenko I. N. Gakh S. G. Aleshin V. A. 《Crystallography Reports》2004,49(1):134-136
Crystallography Reports - Reverse dependences of the permittivity ε′(E =) of Pb(Ti0.45Zr0.53W0.01Cd0.01)O3 ferroelectric films prepared by high-frequency magnetron sputtering on a... 相似文献
38.
A. V. Afanasev I. Akushevich G. I. Gakh N. P. Merenkov 《Journal of Experimental and Theoretical Physics》2001,93(3):449-461
We completely analyze the model-independent leading radiative corrections to the cross section and polarization observables in the semi-inclusive deep-inelastic electron-nucleus scattering with the detection of a proton and the scattered electron in coincidence. The calculations are based on representing the spin-independent and spin-dependent parts of the cross section in terms of the electron structure functions similarly to the Drell-Yan-like representation in electrodynamics. As the applications, we consider the polarization transfer effect from a longitudinally polarized electron beam to the detected proton and the scattering by a polarized target. 相似文献
39.
40.
Mikhail Krasavin Konstantin A Rufanov Andrey V Sosnov Ruben Karapetian Elena Godovykh Olga Soldatkina Yan Lavrovsky Andrei A Gakh 《Chemistry Central journal》2010,4(1):4
A new chemical series of antiproliferative compounds was identified via high-throughput screening on DU-145 human prostate carcinoma cell line (hit compound potency - 5.7 μM). Exploration of the
two peripheral diversity vectors of the hit molecule in a hit-targeted library and testing of the resulting compounds led
to SAR generalizations and identification of the 'best' pharmacophoric moieties. The latter were merged in a single compound
that exhibited a 200-fold better potency than the original hit compound. Specific cancer cell cytotoxicity was confirmed for
the most potent compounds. 相似文献