全文获取类型
收费全文 | 2922篇 |
免费 | 435篇 |
国内免费 | 388篇 |
专业分类
化学 | 2250篇 |
晶体学 | 39篇 |
力学 | 182篇 |
综合类 | 48篇 |
数学 | 269篇 |
物理学 | 957篇 |
出版年
2024年 | 7篇 |
2023年 | 86篇 |
2022年 | 94篇 |
2021年 | 120篇 |
2020年 | 186篇 |
2019年 | 143篇 |
2018年 | 125篇 |
2017年 | 95篇 |
2016年 | 144篇 |
2015年 | 124篇 |
2014年 | 151篇 |
2013年 | 205篇 |
2012年 | 263篇 |
2011年 | 233篇 |
2010年 | 157篇 |
2009年 | 156篇 |
2008年 | 164篇 |
2007年 | 147篇 |
2006年 | 123篇 |
2005年 | 142篇 |
2004年 | 84篇 |
2003年 | 60篇 |
2002年 | 75篇 |
2001年 | 36篇 |
2000年 | 39篇 |
1999年 | 61篇 |
1998年 | 54篇 |
1997年 | 49篇 |
1996年 | 63篇 |
1995年 | 50篇 |
1994年 | 53篇 |
1993年 | 57篇 |
1992年 | 32篇 |
1991年 | 33篇 |
1990年 | 31篇 |
1989年 | 18篇 |
1988年 | 9篇 |
1987年 | 14篇 |
1986年 | 21篇 |
1985年 | 17篇 |
1984年 | 2篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有3745条查询结果,搜索用时 234 毫秒
1.
Designs, Codes and Cryptography - The discrete logarithm problem arises from various areas, including counting the number of points of certain curves and diverse cryptographic schemes. The... 相似文献
2.
Designs, Codes and Cryptography - The Learning-With-Errors (LWE) problem (and its variants including Ring-LWE and Module-LWE), whose security are based on hard ideal lattice problems, has proven to... 相似文献
3.
Yuan Xin Zhang Shuren Zhong Xuanmeng Yuan Hao Song Dongfan Wang Xiaoyu Yu Hanyang Guo Zijian 《中国科学:化学(英文版)》2022,65(10):1978-1984
Science China Chemistry - Oncogenic KRAS reprograms pancreatic ductal adenocarcinoma (PDAC) cells to a state that is awfully resistant to apoptosis. An alternative coping strategy is to trigger a... 相似文献
4.
Dr. Zhoulong Fan Katherine L. Bay Dr. Xiangyang Chen Zhe Zhuang Han Seul Park Dr. Kap-Sun Yeung Prof. Dr. K. N. Houk Prof. Dr. Jin-Quan Yu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(12):4800-4807
A simple and efficient nitrile-directed meta-C−H olefination, acetoxylation, and iodination of biaryl compounds is reported. Compared to the previous approach of installing a complex U-shaped template to achieve a molecular U-turn and assemble the large-sized cyclophane transition state for the remote C−H activation, a synthetically useful phenyl nitrile functional group could also direct remote meta-C−H activation. This reaction provides a useful method for the modification of biaryl compounds because the nitrile group can be readily converted to amines, acids, amides, or other heterocycles. Notably, the remote meta-selectivity of biphenylnitriles could not be expected from previous results with a macrocyclophane nitrile template. DFT computational studies show that a ligand-containing Pd–Ag heterodimeric transition state (TS) favors the desired remote meta-selectivity. Control experiments demonstrate the directing effect of the nitrile group and exclude the possibility of non-directed meta-C−H activation. Substituted 2-pyridone ligands were found to be key in assisting the cleavage of the meta-C−H bond in the concerted metalation–deprotonation (CMD) process. 相似文献
5.
We study ground states of two-component Bose–Einstein condensates (BEC) with trapping potentials in , where the intraspecies interaction and the interspecies interaction ?β are both attractive, , , and β are all positive. The existence and non-existence of ground states are classified completely by investigating equivalently the associated -critical constraint variational problem. The uniqueness and symmetry-breaking of ground states are also analyzed under different types of trapping potentials as , where () is fixed and w is the unique positive solution of in . The semi-trivial limit behavior of ground states is tackled in the companion paper [12]. 相似文献
6.
Xiaoyu Ding Dr. Zhenghui Pan Na Liu Linge Li Xianshu Wang Guoguang Xu Jie Yang Jin Yang Nengsheng Yu Meinan Liu Prof. Wanfei Li Prof. Yuegang Zhang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(15):3775-3780
Flexible lithium/sulfur (Li/S) batteries are promising to meet the emerging power demand for flexible electronic devices. The key challenge for a flexible Li/S battery is to design a cathode with excellent electrochemical performance and mechanical flexibility. In this work, a flexible strap-like Li/S battery based on a S@carbon nanotube/Pt@carbon nanotube hybrid film cathode was designed. It delivers a specific capacity of 1145 mAh g−1 at the first cycle and retains a specific capacity of 822 mAh g−1 after 100 cycles. Moreover, the flexible Li/S battery retains stabile specific capacity and Coulombic efficiency even under severe bending conditions. As a demonstration of practical applications, an LED array is shown stably powered by the flexible Li/S battery under flattened and bent states. We also use the strap-like flexible Li/S battery as a real strap for a watch, which at the same time provides a reliable power supply to the watch. 相似文献
7.
Meccanica - In this work, a bond-based peridynamic de-icing model has been developed to simulate the thermo-mechanical ice removal process of frozen structures. In the proposed numerical method,... 相似文献
8.
Jung-Chien Cheng Lanlan Fang Yiran Li Sijia Wang Yuxi Li Yang Yan Qiongqiong Jia Ze Wu Zhen Wang Xiaoyu Han Ying-Pu Sun 《Experimental & molecular medicine》2020,52(8):1341
Ovarian hyperstimulation syndrome (OHSS) is one of the most life-threatening and potentially fatal complications associated with controlled ovarian hyperstimulation (COH) during in vitro fertilization (IVF) treatment. Although the pathogenesis of OHSS remains unclear, elevated serum estradiol (E2) levels before human chorionic gonadotropin (hCG) administration are associated with the risk of OHSS. The pineal hormone melatonin and its receptors are expressed in human granulosa cells and have been shown to stimulate E2 production. However, the effect of melatonin on the expression of aromatase, an enzyme responsible for a key step in the biosynthesis of E2, in human granulosa cells remains to be determined. Here, we demonstrate that melatonin upregulates aromatase expression in primary cultured human granulosa-lutein (hGL) cells through the melatonin receptor-mediated PKA-CREB pathway. Using a mouse model of OHSS, we demonstrate that administration of the melatonin receptor inhibitor luzindole inhibits the development of OHSS. In addition, the expression of ovarian aromatase and serum E2 levels are upregulated in OHSS mice compared to control mice, but this upregulation is attenuated by inhibition of the function of melatonin. Moreover, clinical results reveal that aromatase expression levels are upregulated in hGL cells from OHSS patients. Melatonin and E2 levels in the follicular fluid are significantly higher in OHSS patients than in non-OHSS patients. Furthermore, melatonin levels are positively correlated with E2 levels in follicular fluid. This study helps to elucidate the mechanisms mediating the expression of aromatase in hGL cells and provides a potential mechanism explaining the high E2 levels in patients with OHSS.Subject terms: Endocrine reproductive disorders, Endocrine reproductive disorders 相似文献
9.
10.