全文获取类型
收费全文 | 90600篇 |
免费 | 16365篇 |
国内免费 | 9200篇 |
专业分类
化学 | 61630篇 |
晶体学 | 916篇 |
力学 | 5753篇 |
综合类 | 513篇 |
数学 | 10094篇 |
物理学 | 37259篇 |
出版年
2024年 | 344篇 |
2023年 | 2046篇 |
2022年 | 3297篇 |
2021年 | 3563篇 |
2020年 | 3934篇 |
2019年 | 3511篇 |
2018年 | 3217篇 |
2017年 | 2868篇 |
2016年 | 4583篇 |
2015年 | 4365篇 |
2014年 | 5325篇 |
2013年 | 6767篇 |
2012年 | 8216篇 |
2011年 | 8397篇 |
2010年 | 5546篇 |
2009年 | 5382篇 |
2008年 | 5781篇 |
2007年 | 5064篇 |
2006年 | 4764篇 |
2005年 | 3822篇 |
2004年 | 2940篇 |
2003年 | 2297篇 |
2002年 | 2109篇 |
2001年 | 1816篇 |
2000年 | 1604篇 |
1999年 | 1839篇 |
1998年 | 1592篇 |
1997年 | 1577篇 |
1996年 | 1563篇 |
1995年 | 1322篇 |
1994年 | 1150篇 |
1993年 | 996篇 |
1992年 | 858篇 |
1991年 | 783篇 |
1990年 | 643篇 |
1989年 | 502篇 |
1988年 | 370篇 |
1987年 | 309篇 |
1986年 | 323篇 |
1985年 | 262篇 |
1984年 | 151篇 |
1983年 | 117篇 |
1982年 | 100篇 |
1981年 | 57篇 |
1980年 | 42篇 |
1979年 | 16篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1957年 | 31篇 |
1922年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Qian Yi Qiao Peng Li Long Han Haoyue Zhao Rongmin Zhang Haiming 《Journal of Thermal Analysis and Calorimetry》2020,142(1):425-435
Journal of Thermal Analysis and Calorimetry - In this article, a pillared layered antimony hydroxide (Sb-LH) material has been prepared by the hydrothermal method. X-ray diffraction,... 相似文献
992.
Chen Dan Dan He Zhi Qiang Wang Min Wu Di Chen Xiang Ying Zhang Zhong Jie 《Journal of Solid State Electrochemistry》2020,24(3):641-654
Journal of Solid State Electrochemistry - In the present work, we demonstrate a strategy of combining boron doping and porosity engineering for a highly modulated carbon component and pore... 相似文献
993.
Numerical Algorithms - This paper considers the inverse problem for identifying the initial value problem of a space-time fractional diffusion wave equation. In general, this problem is ill-posed... 相似文献
994.
Numerical Algorithms - A fully derivative-free conjugate residual method, using secant condition, is introduced to solve general large-scale nonlinear equations. Under some conditions, global and... 相似文献
995.
The Ramanujan Journal - In this paper, we obtain inequalities on $$M_2$$-ranks of overpartitions modulo 6. Let $$overline{N}_2(s,m,n)$$ be the number of overpartitions of n whose $$M_2$$-rank is... 相似文献
996.
Lin Kaiwen Ming Shouli Chen Shuai Zhang Xiaobin Wang Ke Wang Yuehui Xu Jingkun 《Journal of Solid State Electrochemistry》2020,24(6):1387-1396
Journal of Solid State Electrochemistry - Electrochromic technologies require electrochromic π-conjugated polymers to reversibly transition between highly transmissive and broadly absorbing... 相似文献
997.
998.
999.
Benjamin Brennecke Qinghua Wang Qingyang Zhang Hai‐Yu Hu Marc Nazar 《Angewandte Chemie (International ed. in English)》2020,59(22):8512-8516
Herein we report the development of a turn‐on lanthanide luminescent probe for time‐gated detection of nitroreductases (NTRs) in live bacteria. The probe is activated through NTR‐induced formation of the sensitizing carbostyril antenna and resulting energy transfer to the lanthanide center. This novel NTR‐responsive trigger is virtually non‐fluorescent in its inactivated form and features a large signal increase upon activation. We show that the probe is capable of selectively sensing NTR in lysates as well as in live bacteria of the ESKAPE family which are clinically highly relevant multiresistant pathogens responsible for the majority of hospital infections. The results suggest that our probe could be used to develop diagnostic tools for bacterial infections. 相似文献
1000.
Hao Zhang Yanan Zhang Hailing Wang Han Wen Zhifeng Yan Ailan Huang Zijun Bie Yang Chen 《Journal of separation science》2020,43(11):2162-2171
Saponin is an important class of natural products with various pharmacological activities. The selective separation of saponins is an essential step before further analysis. Molecular imprinting has been an effective strategy for preparing antibody mimics. However, a facile and efficient imprinting strategy for saponins is still lacking owing to their amphiphilic nature. Herein, we have prepared the saponins imprinted nanoparticles via cooperative imprinting strategy. This new strategy relies on the combination of various non‐covalent interactions (hydrophobic and hydrogen bonding) and covalent boronate affinity interactions. The obtained imprinted nanoparticles could rebind specific saponins from complex matrices with good selectivity, superb tolerance to interference, and fast binding equilibrium. This method was verified to be versatile and facile. Thus, this strategy could greatly facilitate the preparation of imprinted nanoparticles for the specific recognition of saponins. 相似文献