全文获取类型
收费全文 | 25589篇 |
免费 | 4000篇 |
国内免费 | 2964篇 |
专业分类
化学 | 18482篇 |
晶体学 | 269篇 |
力学 | 1565篇 |
综合类 | 236篇 |
数学 | 3036篇 |
物理学 | 8965篇 |
出版年
2024年 | 53篇 |
2023年 | 496篇 |
2022年 | 592篇 |
2021年 | 802篇 |
2020年 | 975篇 |
2019年 | 994篇 |
2018年 | 799篇 |
2017年 | 812篇 |
2016年 | 1133篇 |
2015年 | 1131篇 |
2014年 | 1410篇 |
2013年 | 1732篇 |
2012年 | 2308篇 |
2011年 | 2311篇 |
2010年 | 1554篇 |
2009年 | 1400篇 |
2008年 | 1671篇 |
2007年 | 1545篇 |
2006年 | 1435篇 |
2005年 | 1206篇 |
2004年 | 885篇 |
2003年 | 776篇 |
2002年 | 759篇 |
2001年 | 661篇 |
2000年 | 554篇 |
1999年 | 543篇 |
1998年 | 460篇 |
1997年 | 412篇 |
1996年 | 456篇 |
1995年 | 374篇 |
1994年 | 307篇 |
1993年 | 256篇 |
1992年 | 246篇 |
1991年 | 232篇 |
1990年 | 184篇 |
1989年 | 162篇 |
1988年 | 118篇 |
1987年 | 101篇 |
1986年 | 105篇 |
1985年 | 95篇 |
1984年 | 69篇 |
1983年 | 58篇 |
1982年 | 47篇 |
1981年 | 37篇 |
1980年 | 36篇 |
1979年 | 24篇 |
1978年 | 26篇 |
1977年 | 29篇 |
1976年 | 29篇 |
1973年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
962.
963.
964.
965.
Dr. Qian Li Gang Liu Haoran Cheng Dr. Qujiang Sun Prof. Junli Zhang Prof. Jun Ming 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(64):15842-15865
Lithium-ion batteries have dominated the energy market from portable electronic devices to electric vehicles. However, the LIBs applications are limited seriously when they were operated in the cold regions and seasons if there is no thermal protection. This is because the Li+ transportation capability within the electrode and particularly in the electrolyte dropped significantly due to the decreased electrolyte liquidity, leading to a sudden decline in performance and short cycle-life. Thus, design a low-temperature electrolyte becomes ever more important to enable the further applications of LIBs. Herein, we summarize the low-temperature electrolyte development from the aspects of solvent, salt, additives, electrolyte analysis, and performance in the different battery systems. Then, we also introduce the recent new insight about the cation solvation structure, which is significant to understand the interfacial behaviors at the low temperature, aiming to guide the design of a low-temperature electrolyte more effectively. 相似文献
966.
967.
Dongsheng Cheng Chunyuan Lu Taishan Zeng 《Journal of Mathematical Analysis and Applications》2012,388(2):1080-1089
In this paper, we develop a fast block Jacobi method for linear systems based on discrete wavelet transform (DWT). Traditional wavelet-based methods for linear systems do not fully utilize the sparsity and the multi-level block structure of the transformed matrix after DWT. For the sake of numerical efficiency, we truncate the transformed matrix to be a sparse matrix by letting the small values be zero. To combine the advantages of the direct method and the iterative method, we solve the sub-systems appropriately based on the multi-level block structure of the transformed matrix after DWT. Numerical examples show that the proposed method is very numerically effective. 相似文献
968.
Synthesis and rheological investigation of self‐healable deferoxamine grafted alginate hydrogel
下载免费PDF全文
![点击此处可从《Journal of Polymer Science.Polymer Physics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Guanzhe Xu Yan Xiao Liang Cheng Runhua Zhou Heng Xu Yimin Chai Meidong Lang 《Journal of Polymer Science.Polymer Physics》2017,55(11):856-865
Deferoxamine grafted alginate (SA‐DFA) was successfully synthesized via amidation of sodium alginate with deferoxamine mesylate as determined by H‐NMR and elemental analysis. SA‐DFA with different graft yield was obtained by adjusting the ratio of sodium alginate and deferoxamine mesylate. It was found that aqueous solution of SA‐DFA could form hydrogel spontaneously due to hydrogen bonding interactions, which also endowed the SA‐DFA hydrogel with self‐healing capability. The healing efficiency of SA‐DFA hydrogels ranged from 53.64 to 90.16%. In addition, surface morphologies of SA‐DFA hydrogels before/after self‐healing process were demonstrated by SEM images. We anticipated that such self‐healable alginate hydrogel would be applied in the field of wound healing. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55, 856–865 相似文献
969.
970.