全文获取类型
收费全文 | 81864篇 |
免费 | 15925篇 |
国内免费 | 7424篇 |
专业分类
化学 | 74104篇 |
晶体学 | 963篇 |
力学 | 3024篇 |
综合类 | 412篇 |
数学 | 7836篇 |
物理学 | 18874篇 |
出版年
2024年 | 91篇 |
2023年 | 782篇 |
2022年 | 1536篇 |
2021年 | 1626篇 |
2020年 | 2749篇 |
2019年 | 4034篇 |
2018年 | 2427篇 |
2017年 | 2070篇 |
2016年 | 5164篇 |
2015年 | 5398篇 |
2014年 | 5768篇 |
2013年 | 7233篇 |
2012年 | 6910篇 |
2011年 | 6540篇 |
2010年 | 5848篇 |
2009年 | 5662篇 |
2008年 | 5564篇 |
2007年 | 4701篇 |
2006年 | 4113篇 |
2005年 | 3958篇 |
2004年 | 3271篇 |
2003年 | 2765篇 |
2002年 | 3438篇 |
2001年 | 2543篇 |
2000年 | 2306篇 |
1999年 | 1311篇 |
1998年 | 891篇 |
1997年 | 774篇 |
1996年 | 743篇 |
1995年 | 598篇 |
1994年 | 628篇 |
1993年 | 516篇 |
1992年 | 482篇 |
1991年 | 411篇 |
1990年 | 363篇 |
1989年 | 296篇 |
1988年 | 243篇 |
1987年 | 175篇 |
1986年 | 191篇 |
1985年 | 196篇 |
1984年 | 128篇 |
1983年 | 82篇 |
1982年 | 90篇 |
1981年 | 63篇 |
1980年 | 71篇 |
1979年 | 63篇 |
1978年 | 45篇 |
1976年 | 48篇 |
1974年 | 48篇 |
1973年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
1.
Lin Yu Wu Yeyu Tan Xuecai Wu Jiawen Huang Kejing Mi Yan Ou Panpan Wei Fucun 《Journal of Solid State Electrochemistry》2022,26(4):959-971
Journal of Solid State Electrochemistry - An ultrasensitive “signal-off–on” electrochemiluminescence (ECL) biosensor is constructed based on f1-TiO2/g-C3N4/PDA for thrombin... 相似文献
2.
Mathematical Programming - We provide a control-theoretic perspective on optimal tensor algorithms for minimizing a convex function in a finite-dimensional Euclidean space. Given a function... 相似文献
3.
Shilin Jiang Dr. Yalan Liu Dr. Lin Wang Prof. Zhifang Chai Prof. Wei-Qun Shi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(60):e202201145
The coordination chemistry of f-block elements (lanthanide and actinide) in molten salts has become a resounding topic in view of its great importance to the research and development (R&D) of molten salt reactors and pyroprocessing. In this Review article, a general overview of the coordination chemistry of f-block elements in molten salts is provided including past achievements and recent advances. Particular emphases are placed on the oxidation state, speciation, and solution structure of f-block metal ions in molten salts, as well as their relationships with the salt composition. Furthermore, this review briefly discusses the spectroscopic and theoretical methods that complement each other in revealing the coordination properties. 相似文献
4.
Song Zhang Luke A. Galuska Xiaodan Gu 《Journal of polymer science. Part A, Polymer chemistry》2022,60(7):1108-1129
Thin films with a nanometer-scale thickness are of great interest to both scientific and industrial communities due to their numerous applications and unique behaviors different from the bulk. However, the understanding of thin-film mechanics is still greatly hampered due to their intrinsic fragility and the lack of commercially available experimental instruments. In this review, we first discuss the progression of thin-film mechanical testing methods based on the supporting substrate: film-on-solid substrate method, film-on-water tensile tests, and water-assisted free-standing tensile tests. By comparing past studies on a model polymer, polystyrene, the effect of different substrates and confinement effect on the thin-film mechanics is evaluated. These techniques have generated fruitful scientific knowledge in the field of organic semiconductors for the understanding of structure–mechanical property relationships. We end this review by providing our perspective for their bright prospects in much broader applications and materials of interest. 相似文献
5.
6.
7.
Hua Saixiang Zhu Huichao Wang Xiao Wu Mingyuan Wu Qingyun Liu Jiuyi Yang Jianjun Zhang Jianan 《Cellulose (London, England)》2022,29(13):7465-7475
Cellulose - Ultraviolet (UV) protective cotton fabric is a convenient and reliable way to protect human body from sunlight. Herein, a polymerizable UV-absorber,... 相似文献
8.
9.
Meihua Shen Dr. Xinpeng Zhao Dr. Lu Han Nanxi Jin Prof. Song Liu Prof. Tao Jia Prof. Zhijun Chen Prof. Xiuhua Zhao 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(20):e202104137
Solar-driven interfacial vaporization by localizing solar-thermal energy conversion to the air−water interface has attracted tremendous attention. In the process of converting solar energy into heat energy, photothermal materials play an essential role. Herein, a flexible solar-thermal material di-cyan substituted 5,12-dibutylquinacridone (DCN−4CQA)@Paper was developed by coating photothermal quinacridone derivatives on the cellulose paper. The DCN−4CQA@Paper combines desired chemical and physical properties, broadband light-absorbing, and shape-conforming abilities that render efficient photothermic vaporization. Notably, synergetic coupling of solar-steam and solar-electricity technologies by integrating DCN−4CQA@Paper and the thermoelectric devices is realized without trade-offs, highlighting the practical consideration toward more impactful solar heat exploitation. Such solar distillation and low-grade heat-to-electricity generation functions can provide potential opportunities for fresh water and electricity supply in off-grid or remote areas. 相似文献
10.
Li Quanxin Li Zheng He Cheng Sun Huilin Tan Shengheng Zhang Hua 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(5):2105-2115
Journal of Radioanalytical and Nuclear Chemistry - The simplified 8-oxide system (SiO2-B2O3-Na2O-Al2O3-CaO-TiO2-MoO3-La2O3) has been prepared under two types of cooling methods, and analyzed with... 相似文献