全文获取类型
收费全文 | 2028篇 |
免费 | 11篇 |
国内免费 | 2篇 |
专业分类
化学 | 1046篇 |
晶体学 | 24篇 |
力学 | 52篇 |
数学 | 182篇 |
物理学 | 737篇 |
出版年
2021年 | 40篇 |
2020年 | 26篇 |
2019年 | 39篇 |
2018年 | 43篇 |
2017年 | 51篇 |
2016年 | 70篇 |
2015年 | 28篇 |
2014年 | 48篇 |
2013年 | 82篇 |
2012年 | 68篇 |
2011年 | 91篇 |
2010年 | 80篇 |
2009年 | 74篇 |
2008年 | 86篇 |
2007年 | 78篇 |
2006年 | 64篇 |
2005年 | 61篇 |
2004年 | 55篇 |
2003年 | 48篇 |
2002年 | 56篇 |
2001年 | 43篇 |
2000年 | 40篇 |
1999年 | 38篇 |
1998年 | 20篇 |
1997年 | 27篇 |
1996年 | 22篇 |
1995年 | 19篇 |
1994年 | 26篇 |
1993年 | 20篇 |
1992年 | 31篇 |
1991年 | 21篇 |
1990年 | 26篇 |
1989年 | 22篇 |
1988年 | 23篇 |
1987年 | 29篇 |
1986年 | 21篇 |
1983年 | 20篇 |
1982年 | 22篇 |
1980年 | 21篇 |
1979年 | 18篇 |
1978年 | 36篇 |
1977年 | 22篇 |
1976年 | 18篇 |
1975年 | 24篇 |
1974年 | 26篇 |
1973年 | 21篇 |
1972年 | 18篇 |
1971年 | 18篇 |
1968年 | 20篇 |
1967年 | 18篇 |
排序方式: 共有2041条查询结果,搜索用时 15 毫秒
91.
Aksinenko A. Yu. Sokolov V. B. Gabrel’yan A. V. Grigoriev V. V. Bachurin S. O. 《Russian Chemical Bulletin》2021,70(11):2180-2184
Russian Chemical Bulletin - Modification of phenothiazine and carbazole derivatives with trifluoromethyl-containing 1,3,5-oxadiazines and imidazolidinediones based on the copper(I)-catalyzed... 相似文献
92.
93.
94.
M. E. Sokolov I. N. Repina O. A. Raitman F. A. Kolokolov V. T. Panyushkin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(5):1097-1100
Monolayers of octadecane-2,4-dione on the surfaces of EuCl3 and TbCl3 solutions in the concentration range of 1 × 10–4 to 5 × 10–3 M at pH 5.8 are studied. It is found that the limiting area of octadecane-2,4-dione molecule in a monolayer dependence on Eu3+ and Tb3+ concentration is of extreme nature. The formation of complex compounds in the ligand monolayer is postulated, and structures are proposed for these compounds at different concentrations of metal ions. 相似文献
95.
96.
A. Yu. Aksinenko V. B. Sokolov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1)
We have found that fluorinated 1,4,2-oxazaphospholines are highly electrophilic phosphorylation reagents for alcohols, thiols, amines, and dialkyl phosphites. Phosphorylation proceeds by opening of the P-O bond to yield the corresponding phosphinates. 相似文献
97.
S. O. Bachurin D. V. Vinogradova E. F. Shevtsova T. V. Goreva T. A. Epishina A. Yu. Aksinenko V. B. Sokolov 《Russian Chemical Bulletin》2013,62(3):816-819
An approach to the modification of biologically active gamma-carbolines with the N-substituted propionamide fragments by the reaction of N-substituted acrylamides with gamma-carbolines catalyzed by cesium fluoride has been suggested. The compounds synthesized were studied for the influence on the functional characteristics of brain mitochondria, in particular, on the membrane potential, calcium-induced “swelling” and calcium capasity of the rat brain mitochondria. 相似文献
98.
Zaitseva Elvira R. Sokolov Anatolii I. Mikhaylov Andrey A. Baleeva Nadezhda S. Baranov Mikhail S. Smirnov Alexander Yu. 《Chemistry of Heterocyclic Compounds》2022,58(8-9):477-480
Chemistry of Heterocyclic Compounds - A methodology was developed for the synthesis of phenylspiro[imidazole-4,3'-thiochroman]ones by treatment of [2-(benzylsulfanyl)-benzylidene]imidazolones... 相似文献
99.
The effect of low-temperature annealing on the magnetization curve of YBa2Cu3O6 + x ceramics in the superconducting state (x ≈ 0.9) is investigated. When the annealing time is fairly long, the field dependence of magnetic moment M exhibits a feature in the form of a plateau, where the value of M remains almost constant. The evolution of this feature in the magnetization curves of annealed samples with annealing time and temperature is studied. It is assumed that low-temperature annealing gives rise to metastable ferromagnetic clusters in YBa2Cu3O6 + x ceramics, the contribution of which to the magnetic moment accounts for the feature in the magnetization curves of the annealed samples. 相似文献
100.
U. V. Valiev J. B. Gruber D. K. Sardar B. Zandi I. S. Kachur A. K. Mukhammadiev V. G. Piryatinskaya V. Yu. Sokolov I. S. Edelman 《Physics of the Solid State》2007,49(1):91-98
The Zeeman effect in the 7 F 6 → 5 D 4 absorption band of the Tb3+ ion in the paramagnetic garnets Tb3Ga5O12 and Tb3Al5O12 was studied. The field dependences of the Zeeman splitting of some absorption lines are found to exhibit unusual behavior: as the magnetic field increases, the band splitting decreases rather than increases. Symmetry analysis relates these lines to 4f → 4f electron transitions of the doublet-quasi-doublet or quasi-doublet-doublet type, for which the field dependences of the splitting differ radically from the well-known field dependences of the Zeeman splitting for quasi-doublet-quasi-doublet or quasi-doublet-singlet transitions in a longitudinal magnetic field. 相似文献