全文获取类型
收费全文 | 164篇 |
免费 | 0篇 |
专业分类
化学 | 137篇 |
晶体学 | 2篇 |
力学 | 3篇 |
数学 | 2篇 |
物理学 | 20篇 |
出版年
2021年 | 3篇 |
2020年 | 8篇 |
2019年 | 6篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 11篇 |
2012年 | 9篇 |
2011年 | 7篇 |
2010年 | 9篇 |
2009年 | 7篇 |
2008年 | 7篇 |
2007年 | 8篇 |
2006年 | 7篇 |
2005年 | 2篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 4篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1968年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有164条查询结果,搜索用时 15 毫秒
31.
A. N. Grinev I. N. Nesterova M. V. Mezentseva 《Chemistry of Heterocyclic Compounds》1987,23(10):1067-1069
A new method is proposed for the synthesis of derivatives of indeno[1,2-b]-pyrrole-4-onesby intramolecular cyclization of the corresponding 5-(o-carboxyphenyl)pyrroles by trifluoroacetic anhydride.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1333–1335, October, 1987. 相似文献
32.
Toropov A. A. Toropova A. P. Nesterova A. I. Nabiev O. M. 《Russian Journal of Coordination Chemistry》2004,30(9):611-617
The concept of modeling of the complex stability based on optimization of the correlation weights of the nearest neighborhood codes (NNC), the hydrogen bond index (HBI), and the cyclicity code (CC) is described. The NNC is a local topochemical invariant of a vertex of the molecular graph whose numerical value is a function of the total number and the composition of vertices adjacent to the given vertex. The HBI is a global chemical invariant of the molecular graph calculated from the number of oxygen and nitrogen atoms. The CC is a global topological invariant of the graph equal to the number of rings present in the ligand structure. The statistical characteristics of the best model of the stability constants of the complexes are as follows: n = 75, r = 0.9738, s = 0.457, F = 1337 (training sample); n = 75, r = 0.9795, s = 0.461, F = 1724 (test sample). 相似文献
33.
Ethyl esters of -(3-chloro-1,4-naphthoquinon-3-yl)crotonic or cinnamic acids were obtained by the reaction of 2,3-dichloro-1,4-naphthoquinone with ethyl esters of N-substituted -aminocrotonic or -aminocinnamic acids. These esters were converted by alkaline fusion into benz[f]indole-4,9-dione-3-carboxylic acids, and into ethyl esters of benz[g]indole-4,5-dione-3-carboxylic acid by the action of acetic acid.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 66–68, January, 1989. 相似文献
34.
A. A. Efimova R. M. Varushchenko A. I. Druzhinina N. V. Chelovskaya E. S. Tkachenko I. A. Nesterov T. N. Nesterova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(3):343-349
The heat capacity (C p m ) of 4,4′-dimethylbiphenyl and 4,4′-di-tert-butylbiphenyl in the temperature range of 8—373 K was measured by low-temperat ure adiabatic calorimetry, and thermodynamic characteristics of the solid-phase transitions of 4,4′-d i-tert-butylbiphenyl were determined. Temperatures, enthalpies, entropies of melting, and the purity of the samples of the tested substances were determined by means of differential scanning calorimetry. The main thermodynamic functions of the substances in the condensed state at 298 K were calculated. 相似文献
35.
A. M. Bochek Sh. Nishiyama N. M. Zabivalova I. I. Gavrilova N. A. Nesterova G. M. Poltoratskii E. F. Panarin 《Polymer Science Series A》2010,52(8):775-780
The rheological properties of diluted and moderately concentrated solutions of methyl cellulose mixtures with poly(N-vinylformamide) in water and dimethyl sulfoxide are investigated. Negative deviations of the viscosities of these solutions
from the additive values are observed and explained by different mechanisms of solvation of macromolecules with water and
dimethyl sulfoxide. Incompatibility of the polymers in a common solvent is discovered. This circumstance leads to the formation
of a new system of hydrogen bonds and rearrangement of the structural organization of solutions. 相似文献
36.
Valentyna V. Semenaka Oksana V. Nesterova Volodymyr N. Kokozay Roman I. Zybatyuk Oleg V. Shishkin Roman Boca Carlos J. Gómez-García Juan M. Clemente-Juan Julia Jezierska 《Polyhedron》2010
Four novel heterometallic complexes [Co2Cr2(NCS)4(HDea)2(Dea)2]·4dmf (1), [Co2Cr2(NCS)4(HDea)2(Dea)2]·4dmso (2), [Mn2Cr2(NCS)4(HDea)2(Dea)2(dmf)2]·2dmf (3) and [Mn2Cr2(NCS)4(HDea)2(Dea)2(dmso)2]·4dmso (4) have been prepared using zerovalent cobalt (1, 2) or manganese (3, 4), Reineckes salt, ammonium thiocyanate and a non-aqueous solution of diethanolamine (H2Dea) in air. The single X-ray analysis reveals that all compounds have similar centrosymmetric crystal structures based on a tetranuclear {M2Cr2(μ3-O)2(μ-O)4} (M = Co, Mn) core. Variable-temperature magnetic susceptibility measurements of 1, 2 and 4 show antiferromagnetic coupling between the magnetic centers, while 3 exhibits a ferromagnetic behavior. 相似文献
37.
Bochek A. M. Shevchuk I. L. Gavrilova I. I. Nesterova N. A. Panarin E. F. Gofman I. V. Lavrent’ev V. K. 《Russian Journal of Applied Chemistry》2010,83(9):1622-1627
Rheological properties of mixtures of dilute and moderately concentrated aqueous solutions of poly-N-vinylformamide and carboxymethyl cellulose of various degrees of ionization were studied. Composite film materials were prepared,
and their physicomechanical properties and structural organization were studied. 相似文献
38.
39.
O. M. Nesterova B. S. Kikot' M. N. Preobrazhenskaya 《Chemistry of Heterocyclic Compounds》1979,15(2):150-153
In a study of the IR absorption spectra of diastereomeric (with respect to phosphorus) 2,3-O-alkylphosphonates of nucleosides it was shown that the IR spectra of the diastereomers differ at 820–860 (O-P-O), 1040–1060 (P-O-C), and 1250–1300 cm–1 (P=O). Higher O=P and P-O-C values and lower O-P-O values are observed for the R isomers (as compared with the S isomers), and this provides a possibility for the determination of the orientation of the P=O group relative to the protons of the phospholane ring in alkylphosphonates of nucleosides by comparison of the spectra of the diastereomers.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 181–184, February, 1979. 相似文献
40.
E. I. Matrosov N. P. Nesterova A. I. Zarubin I. A. Komolova T. Ya. Medved' M. I. Kabachnik 《Russian Chemical Bulletin》1988,37(5):935-939
1. | Using thermometric titration and IR spectroscopy, we investigated the reaction of carbamoylmethylphosphoryl compounds (CMP) and of some monophosphoryl compounds with HNO3 in dichloroethane and in CCl4. |
2. | The interaction between CMP and HNO3 takes place in two stages with sharply different H values which correspond to the formation of molecular complexes at the P=O and C=O groups. |