全文获取类型
收费全文 | 49715篇 |
免费 | 739篇 |
国内免费 | 408篇 |
专业分类
化学 | 23417篇 |
晶体学 | 951篇 |
力学 | 2467篇 |
综合类 | 16篇 |
数学 | 5026篇 |
物理学 | 18985篇 |
出版年
2022年 | 443篇 |
2021年 | 478篇 |
2020年 | 413篇 |
2019年 | 441篇 |
2018年 | 701篇 |
2017年 | 613篇 |
2016年 | 980篇 |
2015年 | 585篇 |
2014年 | 999篇 |
2013年 | 2197篇 |
2012年 | 2168篇 |
2011年 | 2753篇 |
2010年 | 1998篇 |
2009年 | 1963篇 |
2008年 | 2289篇 |
2007年 | 2260篇 |
2006年 | 2172篇 |
2005年 | 1833篇 |
2004年 | 1672篇 |
2003年 | 1439篇 |
2002年 | 1405篇 |
2001年 | 2118篇 |
2000年 | 1493篇 |
1999年 | 1218篇 |
1998年 | 890篇 |
1997年 | 886篇 |
1996年 | 730篇 |
1995年 | 670篇 |
1994年 | 623篇 |
1993年 | 527篇 |
1992年 | 615篇 |
1991年 | 599篇 |
1990年 | 587篇 |
1989年 | 516篇 |
1988年 | 533篇 |
1987年 | 500篇 |
1986年 | 440篇 |
1985年 | 515篇 |
1984年 | 529篇 |
1983年 | 380篇 |
1982年 | 412篇 |
1981年 | 404篇 |
1980年 | 335篇 |
1979年 | 416篇 |
1978年 | 395篇 |
1977年 | 413篇 |
1976年 | 416篇 |
1975年 | 369篇 |
1974年 | 342篇 |
1973年 | 358篇 |
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
1.
Chuprin A. S. Belova S. A. Bugaenko M. G. Vologzhanina A. V. Loktev A. S. Voloshin Ya. Z. Buznik V. M. Dedov A. G. 《Kinetics and Catalysis》2022,63(1):108-116
Kinetics and Catalysis - A new ruthenium(II) cage complex with polar terminal groups in the apical substituents has been synthesized; the molecular design of the complex contributes to the... 相似文献
2.
High Energy Chemistry - Modification of Polyvinylidene fluoride (PVDF) by radiation grafting is a research hotspot in recent years. In this study, the monomer 2-Hydroxyethyl methacrylate (HEMA) was... 相似文献
3.
Alawainati F. A. Manaa H. Henari F. Z. Biyiklioglu Z. Arslan T. Jaafar A. 《Journal of Applied Spectroscopy》2021,88(5):951-957
Journal of Applied Spectroscopy - Detailed measurements of nonlinear optical properties and optical limiting for four phthalocyanine (Pc) derivatives (PcCo, PcCu, PcMn, and PcSi) are reported. The... 相似文献
4.
Li Y. Shi W. H. Dong L. M. Xu S. X. Huang H. J. Yin J. R. 《Journal of Applied Spectroscopy》2022,89(3):534-541
Journal of Applied Spectroscopy - Sr3B2O6:Dy3+, Eu3+ single-matrix white-light-emitting materials are prepared using the high-temperature solid-state method. The microstructure, emission spectrum,... 相似文献
5.
Siberian Mathematical Journal - A lattice homomorphism between quasi-Banach lattices is known to be compact if and only if it is a sum of a series of rank one lattice... 相似文献
6.
The chiral phase transition and equation of state are studied within a novel self-consistent mean-field approximation of the two-flavor Nambu-Jona-Lasinio model. In this newly developed model, modifications to the chemical μ and chiral chemical \begin{document}$\mu_5$\end{document} ![]()
![]()
potentials are naturally included by introducing vector and axial-vector channels from Fierz-transformed Lagrangian to the standard Lagrangian. In the proper-time scheme, the chiral phase transition is a crossover in the \begin{document}$T-\mu$\end{document} ![]()
![]()
plane. However, when \begin{document}$\mu_5$\end{document} ![]()
![]()
is incorporated, our study demonstrates that a first order phase transition may emerge. Furthermore, the chiral imbalance will soften the equation of state of quark matter. The mass-radius relationship and tidal deformability of quark stars are calculated. The maximum mass and radius decrease as \begin{document}$\mu_5$\end{document} ![]()
![]()
increases. Our study also indicates that the vector and axial-vector channels exhibit an opposite influence on the equation of state. 相似文献
7.
8.
9.
We study the full counting statistics of transport electrons through a semiconductor two-level quantum dot with Rashba spin–orbit (SO) coupling, which acts as a nonabelian gauge field and thus induces the electron transition between two levels along with the spin flip. By means of the quantum master equation approach, shot noise and skewness are obtained at finite temperature with two-body Coulomb interaction. We particularly demonstrate the crucial effect of SO coupling on the super-Poissonian fluctuation of transport electrons, in terms of which the SO coupling can be probed by the zero-frequency cumulants. While the charge currents are not sensitive to the SO coupling. 相似文献
10.
Su X. F. Zhang Y. L. Maximov A. L. Zhang K. Xin Q. Feng C. Q. Bai X. F. Wu W. 《Russian Journal of Applied Chemistry》2020,93(1):127-136
Russian Journal of Applied Chemistry - Nanoscale ZSM-5 (AlZ5-D) and Ga-substituted ZSM-5 zeolites ((Al,Ga)Z5-D and GaZ5-D) were synthesized by a green dry-gel conversion strategy. For comparison,... 相似文献