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排序方式: 共有109条查询结果,搜索用时 0 毫秒
91.
92.
A.S. Bratashevskij V.G. Gorbenko A.I. Derebchinskij A.Ya. Derkach Yu.V. Zhebrovskij A.A. Zybalov I.M. Karnaukhov L.Ya. Kolesnikov O.G. Konovalov A.A. Lukhanin A.S. Omelaenko A.L. Rubashkin P.V. Sorokin E.A. Sporov A.E. Tenishev S.G. Tonapetyan 《Nuclear Physics B》1980,166(3):525-533
Measurement of secondary-proton polarization from the reaction γp → π0p have been performed in the proton energy range 500–800 MeV at c.m. pion emission angles 100°, 120°, 140°. The experiment was carried out using an optical spark chamber telescope at the output of the magnetic spectrometer. The obtained experimental data are included in a Walker-type analysis in order to verify the parameters of the resonances P11(1470), D13(1570) and S11(1535). Proton polarization in the reaction γp → π0p was measured for a photon energy of 450 MeV at a c.m. pion emission angle of 105° using photons linearly polarized at 45° to the reaction plane. A liquid hydrogen target in the field of a superconducting magnet was used for the separation of the Px′ and Pz′ components of the secondary-proton polarization vector.Data are obtained for three components (Px′, Py, Pz′) of the proton polarization. The obtained results are compared with predictions of different multipole analyses of photoproduction. 相似文献
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96.
Rheological Properties of Gels of Gelatin with Sodium Alginate 总被引:1,自引:0,他引:1
Voron'ko N. G. Derkach S. R. Izmailova V. N. 《Russian Journal of Applied Chemistry》2002,75(5):790-794
Effect of anionic polysaccharide, sodium alginate, on the rheological characteristics of gelatin gels is studied. It follows from the rheological curves that low-temperature gelatin gels with sodium alginate can be classified with elastoviscoplastic systems. Multicomponent gels obtained with the two gel-forming agents demonstrate synergism of the rheological characteristics. 相似文献
97.
Unsubstituted, N-alkyl(aryl)- and N-chloroamidines react with oxalyl chloride to form imidazolidine-4, 5-diones. The hydrochlorides of 1-aryl-2-alkyl(aryl)imidazolidine-4, 5-diones decompose thermally to give N-arylimidoyl isocyanates which change immediately to 4-quinazolones. 相似文献
98.
N. F. Komissarenko A. I. Derkach I. P. Kovalev I. F. Satsyperova 《Chemistry of Natural Compounds》1978,14(2):149-151
Summary The roots of Lesko's cow parsnip have yielded 13 substances of coumarin nature: osthole, psoralen, bergapten, xanthotoxin, isopimpinellin, phellopterin, heracol, biacangelicin, angelicin, sphondin, isobergapten, 6-isopentenyloxy-5-methoxyangelicin, and heraclesol.Heraclesol is a new compound and is (+)-6-[2(R)3-dihydroxy-3-dimethylbutoxy]-5-methoxy-furo-2,3:7,8-coumarin (I), and this is the first time that 6-isopentenyloxy-5-methoxy-angelicin has been obtained from a plant of the genusHeracleum.Khar'kov Scientific-Research Institute of Pharmaceutical Chemistry. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 184–187, March–April, 1978. 相似文献
99.
S. R. Derkach S. M. Levachev A. N. Kukushkina N. V. Novoselova A. E. Kharlov V. N. Matveenko 《Colloid Journal》2006,68(6):700-706
Changes in the rheological properties of a model concentrated oil-in-water emulsion stabilized with globular protein (bovine serum albumin) upon the addition of nonionic surfactant polyoxyethylene (20) sorbitan monooleate (Tween 80) are studied. Non-Newtonian behavior is typical of the emulsions in question; moreover, they are characterized by the existence of yield stress. At stresses above the yield stress, the viscosity drops not immediately but after the intermediate Newtonian region at the flow curve. For all systems studied, the total flow curve is exhibited with the minimum Newtonian viscosity that is adequately described by the Cross formula. An increase in the Tween 80 concentration leads to a decrease in the viscosity of emulsion. Two threshold phenomena on the concentration dependences of rheological properties are revealed: at low concentration of added nonionic surfactant, the yield stress drops abruptly, whereas the viscosity lowers considerably with an increase in surfactant concentration to 1 × 10?3 mol/l and the emulsion becomes unstable. The effects observed can be explained by the gradual displacement of high-molecular-weight stabilizer from interfacial layers and its replacement by nonionic surfactant. 相似文献
100.
By column chromatography on polyamide sorbent, the inflorescences of pot marigold calendula have yielded eight substances of flavonoid nature: two aglycons — quercetin (C15H10O7, mp 309–311°C) and isorhamnetin (C16H12O7, mp 314–316°C); six glycosides, of which three have been identified as isoquercetin (C21H20O12, [α] D 20 ?36° in methanol, mp 218–220°C), isorhamnetin 3-O-β-D-glucoside (C22H22O12, [α] D 20 ?59° in dimethylformamide, mp 193–195°C), narcissin (C28H32O16, [α] D 21 ?28° in dimethylformamide, mp 180–182°C), and three substances that have proved to be new and have been called calendoflaside (C28H32O15, [α] D 21 ?85° in methanol, mp 192–195°C; calendoflavoside (C28H32O16, [α] D 20 ?106° in methanol, mp 189–192°C), and calendoflavobioside (c27H30O16, [α] D 20 ?105° in methanol, mp 194–197°C). 相似文献