全文获取类型
收费全文 | 704篇 |
免费 | 35篇 |
国内免费 | 36篇 |
专业分类
化学 | 327篇 |
晶体学 | 7篇 |
力学 | 26篇 |
综合类 | 3篇 |
数学 | 75篇 |
物理学 | 337篇 |
出版年
2023年 | 5篇 |
2022年 | 6篇 |
2021年 | 17篇 |
2020年 | 26篇 |
2019年 | 14篇 |
2018年 | 29篇 |
2017年 | 24篇 |
2016年 | 31篇 |
2015年 | 14篇 |
2014年 | 16篇 |
2013年 | 30篇 |
2012年 | 32篇 |
2011年 | 39篇 |
2010年 | 32篇 |
2009年 | 33篇 |
2008年 | 48篇 |
2007年 | 34篇 |
2006年 | 27篇 |
2005年 | 27篇 |
2004年 | 22篇 |
2003年 | 21篇 |
2002年 | 12篇 |
2001年 | 21篇 |
2000年 | 19篇 |
1999年 | 15篇 |
1998年 | 12篇 |
1997年 | 11篇 |
1996年 | 13篇 |
1995年 | 6篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 7篇 |
1990年 | 11篇 |
1987年 | 3篇 |
1985年 | 5篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1979年 | 9篇 |
1975年 | 3篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1972年 | 4篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1969年 | 3篇 |
1968年 | 7篇 |
1958年 | 5篇 |
1957年 | 4篇 |
1956年 | 4篇 |
排序方式: 共有775条查询结果,搜索用时 31 毫秒
1.
Varfolomeev S. D. Panin A. A. Semenova N. A. Ublinskiy M. V. Akhadov T. A. Bykov V. I. Tsybenova S. B. 《Russian Chemical Bulletin》2022,71(3):591-594
A kinetic study of the effect of thermoheliox (inhalation of a helium and oxygen mixture, 70 °C) on the functional hemodynamics of the human brain by functional magnetic resonance imaging was carried out. The dynamic responses of the BOLD signal were found to be biphasic. An empirical equation describing the first phase of the hemodynamic response to visual stimulus was proposed. It was shown that preliminary inhalation of thermoheliox stimulates the hemodynamic responses by slowing down the vasoconstriction.
相似文献2.
Drichko I. L. Smirnov I. Yu. Bakarov A. K. Bykov A. A. Dmitriev A. A. Galperin Yu. M. 《JETP Letters》2020,112(1):45-52
JETP Letters - The DC and AC conductivities of the n-GaAs/AlAs heterostructure with two filled size quantization levels are studied within a wide magnetic field range. The electron spectrum of such... 相似文献
3.
4.
A.D. Bykov V.N. Saveliev C. Camy-Peyret A. Valentin 《Journal of Molecular Spectroscopy》2004,224(2):164-175
Forty-seven N2 broadened water vapor line-widths have been measured in the 1845-2140 cm−1 spectral range with a Fourier Transform spectrometer in the 258-330 K temperature range at a spectral resolution of 0.005 cm−1 for the lines with upper state rotational quantum number up to 16. The measured exponents of the temperature dependence of the width exhibit a large range of values from 1.60 to −0.86. Theoretical calculations were made using a semi-empirical technique based on the Anderson theory. The calculated broadening coefficients as well as the temperature exponents for the half-width agree satisfactory with measured values. 相似文献
5.
Khar'kov Institute of Radio Electronics. Translated from Izvestiya Vysshykh Uchebnykh Zavedenii, Radiofizika, Vol. 34, No. 5, pp. 607–610, May, 1991. 相似文献
6.
7.
本文对广义风险过程中的渐近方差作了非参数估计,得出并证明了两个定理,为广义风险过程中破产概率的区间估计作了理论准备. 相似文献
8.
9.
B. G. Ershov A. F. Seliverstov N. L. Sukhov G. L. Bykov 《Russian Chemical Bulletin》1992,41(10):1805-1809
The sorption of Cu2+ ions by chitin and chitosan from aqueous solutions has been investigated, as well as the molecular structure of the complexes formed. The static exchange capacities have been determined, equal to 3.5 and 0.25 mmole/g for chitosan and chitin, respectively, and the partition coefficients (5000 and 70 g/ml). It has been shown that in complex formation a bond with the amino group is formed as the result of the substitution of a proton in the latter. The EPR spectra of these complexes have been obtained and their radiospectroscopic parameters determined (g
= 2.334,g
= 2.054,A = 0.0156 cm–1, andB = 0.0028 cm–1 for chitin, andg
= 2.231,g
= 2.048,A = 0.0192 cm–1, andB = 0.0025 cm–1 for chitosan). For chitosan the ligands are two nitrogen atoms of the amino groups and two oxygen atoms of the hydroxyl groups in the position C3 of adjacent glucosamine rings; for chitin, the oxygen atoms of the acetyl groups take part in addition in the complex formation. The analysis of the radiospectroscopic parameters and their comparison with published data lead to the conclusion that the Cu2+ complex with chitosan has a tetragonal symmetry, while the complex with chitin most probably has an octahedral structure.Institute of Physical Chemistry, Russian Academy of Sciences, 117915 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 10, pp. 2305–2311, October, 1992. 相似文献
10.
A simple method for evaluating the correction for the effect of solvent on the dipole moments of molecules, determined using the Debye method of dilute solutions, is proposed. 相似文献