全文获取类型
收费全文 | 11905篇 |
免费 | 1474篇 |
国内免费 | 920篇 |
专业分类
化学 | 6747篇 |
晶体学 | 123篇 |
力学 | 412篇 |
综合类 | 49篇 |
数学 | 838篇 |
物理学 | 3017篇 |
无线电 | 3113篇 |
出版年
2024年 | 36篇 |
2023年 | 274篇 |
2022年 | 305篇 |
2021年 | 423篇 |
2020年 | 417篇 |
2019年 | 401篇 |
2018年 | 320篇 |
2017年 | 283篇 |
2016年 | 520篇 |
2015年 | 494篇 |
2014年 | 599篇 |
2013年 | 811篇 |
2012年 | 996篇 |
2011年 | 971篇 |
2010年 | 622篇 |
2009年 | 680篇 |
2008年 | 765篇 |
2007年 | 739篇 |
2006年 | 645篇 |
2005年 | 617篇 |
2004年 | 393篇 |
2003年 | 313篇 |
2002年 | 336篇 |
2001年 | 263篇 |
2000年 | 247篇 |
1999年 | 223篇 |
1998年 | 201篇 |
1997年 | 146篇 |
1996年 | 146篇 |
1995年 | 179篇 |
1994年 | 153篇 |
1993年 | 121篇 |
1992年 | 107篇 |
1991年 | 86篇 |
1990年 | 80篇 |
1989年 | 42篇 |
1988年 | 52篇 |
1987年 | 40篇 |
1986年 | 40篇 |
1985年 | 38篇 |
1984年 | 26篇 |
1983年 | 15篇 |
1982年 | 29篇 |
1981年 | 16篇 |
1979年 | 9篇 |
1978年 | 10篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1971年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
101.
Hai-Hua Xie Jian Su Xiao-Lei Ge Ting-Ting Dong Xin Li Hui-Min Wen 《Natural product research》2018,32(4):418-424
Eight compounds were isolated from the seeds of Holarrhena antidysenterica Wall.ex A.DC. On the basis of physico-chemical properties and spectroscopic data, holarrhenanan (1) was identified as a new compound, compounds 2–3 were isolated from H. antidysenterica for the first time, and five known compounds were also obtained. Inhibitory effects of some compounds and extracts to the intestinal peristalsis were evaluated. Results showed that the extracts and compounds 4, 6 exhibited remarkable inhibitory effects with tension inhibition rate of 32.77, 32.77% and amplitude inhibition rate of 59.51, 55.98%, respectively on the vitro rabbit intestinal peristalsis. 相似文献
102.
103.
单相旋转型驻波超声电机的数学模型及仿真 总被引:1,自引:0,他引:1
尽管单相驱动的旋转型驻波超声电机的原理样机早巳研制成功,但对这类电机的运动机理的研究却一直局限在定性分析上。本文将从能量角度,根据Hamilton变分原理,定、转子摩擦界面采用纯滑动模型建立了该种电机的数学模型;并根据此模型,用MATLAB语言作了计算机仿真,得到了该种电机的开、关过程动态响应。 相似文献
104.
In this paper, we propose an adaptive defect-correction method for natural convection (NC) equations. A defect-correction method (DCM) is proposed for solving NC equations to overcome the convection dominance problem caused by a high Rayleigh number. To solve the large amount of computation and the discontinuity of the gradient of the numerical solution, we combine a new recovery-type posteriori estimator in view of the gradient recovery and superconvergent theory. The presented reliability and efficiency analysis shows that the true error can be effectively bounded by the recovery-based error estimator. Finally, the stability, accuracy and efficiency of the proposed method are confirmed by several numerical investigations. 相似文献
105.
Su Wang Qifang Sun Wenxiu Peng Yue Ma Ying Zhou Dawei Song Hongzhou Zhang Xixi Shi Chunliang Li Lianqi Zhang 《Journal of Energy Chemistry》2021,(7):85-93
Lithium metal is one of the most promising anodes for next-generation batteries due to its high capacity and low reduction potential.However,the notorious Li de... 相似文献
106.
基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(hairy and enhancer of split 1,Hes1)调控蛋白激酶B (Protein Kinase B,AKT)-鼠双微体2 (Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失的磷酸酶及张力蛋白同源的基因(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)通路的一种物理机制.研究发现,Hes1通过与PTEN结合抑制PTEN表达,并调控AKT信号.表明了Hes1蛋白的合成,以及Hes1与PTEN相互作用调控AKTMDM2-p53-PTEN通路信号,将会有效地控制细胞结果 . Hes1作为AKT-MDM2-p53-PTEN信号通路中上游调节的重要因素,还可以在一定程度上通过影响p53蛋白功能,改变p53对肿瘤的抑制性.理论结果可用于预测Notch通路信号异常诱导的致癌性,并进一步揭示了Notch信号通路影响细胞AKT-MDM2-p53-PTEN通路的激活... 相似文献
107.
This paper first found the co-luminescence effect of guanosine-5′-monophosphate (GMP) system. Experiment showed that La3+, Gd3+, Sc3+ and Y3+ all could enhance the luminescence of Tb-GMP system, among which Gd3+ has the greatest enhancement. Under the optimum conditions, the enhanced intensity of the system is in proportion to the concentration of GMP in the range from 3×10−8 to 3×10−5 mol/l. The detection limit is 3.9×10−9 mol/l. In the study of mechanism, we propose that both Tb and Gd complexes can form bigger netlike compound by the link of the oxygen bridge, through which the energy absorbed by Gd complex may transfer to Tb3+ in Tb complex. 相似文献
108.
Consistency in formulation of spin current and torque associated with a variance of angular momentum
Based on the Noether's theorem, we develop systematically and rigorously the spin-dependent formulation of the conservation laws. The effect of the electronic polarization due to the spin-orbit coupling is included in the Maxwell equations. The polarization is related to the antisymmetric components of spin current, and it provides a possibility to measure the spin current directly. The variances of spin and orbit angular momentum currents imply a torque on the "electric dipole" associated with the moving electron. The dependencies of the torque on the polarization and the force on the motions of spin-polarized electrons in a two-dimensional electron gas with the Rashba spin-orbit coupling are discussed. 相似文献
109.
Jing Wen Jian Su Yinnian He Hongbin Chen 《Numerical Methods for Partial Differential Equations》2021,37(1):383-405
In this paper, a semi‐discrete scheme and a fully discrete scheme of the Stokes‐Biot model are proposed, and we analyze the semi‐discrete scheme in detail. First of all, we prove the existence and uniqueness of the semi‐discrete scheme, and a‐priori error estimates are derived. Then, we present the same conclusions for the fully discrete scheme. Finally, under both matching and non‐matching meshes some numerical tests are given to validate the analysis of convergence, which well support the theoretical results. 相似文献
110.