排序方式: 共有30条查询结果,搜索用时 15 毫秒
1.
M. E. Perel'son A. A. Kir'yanov Yu. E. Sklyar V. V. Vandyshev 《Chemistry of Natural Compounds》1973,6(6):696-698
Summary A spectrophotometric method is proposed for determining the content of aspidin in a crystalline powder and in the rhizomes of the fernsDryopteris spinulosa (M),D. phegopteris (L.), andD. fragrans (L.) Schott.All-Union Scientific-Research Institute for Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 684–687, November–December, 1970. 相似文献
2.
3.
4.
Chernorukov N. G. Suleimanov E. V. Egorova O. A. Kir'yanov K. V. 《Russian Journal of General Chemistry》2003,73(2):180-182
The standard enthalpies of formation of uranophosphates MI
I(PUO6)2·nH2O (MI
I = Mn, Fe, Co, Ni, Cu, Zn, Cd) are determined. The standard enthalpies of the synthesis and dehydration of these compounds are calculated and analyzed. 相似文献
5.
6.
7.
8.
L. P. Agulova A. M. Opalinskaya V. S. Kir'yanov 《Theoretical and Experimental Chemistry》1991,26(5):588-591
It was established that during the simultaneous action of a weak magnetic field (H=40 A/m, f=0.03 Hz) and hydroquinone at a low concentration on the oxidation of trivalent cerium by bromate magnetic field effects are absent, although separately a magnetic field accelerates and hydroquinone retards the reaction. These results can serve as indirect evidence that the mechanism of the action of the weak magnetic field on this reaction is free-radical in nature.Translated from Teoreticheskaya i Éksperimental/naya Khimiya, Vol. 26, No. 5, pp. 624–627, September–October, 1990.The authors thank A. B. Rovinskii for useful discussion and critical remarks. 相似文献
9.
10.
For a dielectric with blocking electrodes, the system of continuity and Poisson's equations is numerically solved in the nonsteady case. The distribution of the mobile-charge concentration and field inside an electrically neutral dielectric at various times, both after the potential is switched on and after the short-circuiting the latter. The time dependences of the isothermal polarization and depolarization currents are calculated. It is established, in particular, that these dependences for a dielectric with one type of mobile charge carrier are not approximated by an exponential. 相似文献