全文获取类型
收费全文 | 28832篇 |
免费 | 3978篇 |
国内免费 | 2890篇 |
专业分类
化学 | 21146篇 |
晶体学 | 421篇 |
力学 | 1512篇 |
综合类 | 233篇 |
数学 | 2876篇 |
物理学 | 9512篇 |
出版年
2024年 | 59篇 |
2023年 | 440篇 |
2022年 | 813篇 |
2021年 | 863篇 |
2020年 | 987篇 |
2019年 | 954篇 |
2018年 | 755篇 |
2017年 | 742篇 |
2016年 | 1268篇 |
2015年 | 1193篇 |
2014年 | 1460篇 |
2013年 | 2036篇 |
2012年 | 2522篇 |
2011年 | 2599篇 |
2010年 | 1744篇 |
2009年 | 1587篇 |
2008年 | 1885篇 |
2007年 | 1642篇 |
2006年 | 1584篇 |
2005年 | 1473篇 |
2004年 | 1117篇 |
2003年 | 917篇 |
2002年 | 1016篇 |
2001年 | 730篇 |
2000年 | 679篇 |
1999年 | 576篇 |
1998年 | 458篇 |
1997年 | 390篇 |
1996年 | 402篇 |
1995年 | 406篇 |
1994年 | 341篇 |
1993年 | 299篇 |
1992年 | 267篇 |
1991年 | 241篇 |
1990年 | 207篇 |
1989年 | 151篇 |
1988年 | 152篇 |
1987年 | 108篇 |
1986年 | 111篇 |
1985年 | 111篇 |
1984年 | 75篇 |
1983年 | 59篇 |
1982年 | 57篇 |
1981年 | 44篇 |
1980年 | 21篇 |
1979年 | 24篇 |
1978年 | 22篇 |
1977年 | 19篇 |
1976年 | 14篇 |
1974年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 687 毫秒
11.
12.
13.
Star copolymers have attracted significant interest due to their different characteristics compared with diblock copolymers, including higher critical micelle concentration, lower viscosity, unique spatial shape, or morphologies. Development of synthetic skills such as anionic polymerization and controlled radical polymerization have made it possible to make diverse architectures of polymers. Depending on the molecular architecture of the copolymer, numerous morphologies are possible, for instance, Archimedean tiling patterns and cylindrical microdomains at symmetric volume fraction for miktoarm star copolymers as well as asymmetric lamellar microdomains for star‐shaped copolymers, which have not been reported for linear block copolymers. In this review, we focus on morphologies and microphase separations of miktoarm (AmBn and ABC miktoarm) star copolymers and star‐shaped [(A‐b‐B)n] copolymers with nonlinear architecture. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 1–21 相似文献
14.
15.
16.
17.
Polypyrrole Shell@3D‐Ni Metal Core Structured Electrodes for High‐Performance Supercapacitors
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Gao‐Feng Chen Yu‐Zhi Su Pan‐Yong Kuang Zhao‐Qing Liu Dao‐Yi Chen Xu Wu Nan Li Prof. Shi‐Zhang Qiao 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(12):4614-4621
Three‐dimensional (3D) nanometal films serving as current collectors have attracted much interest recently owing to their promising application in high‐performance supercapacitors. In the process of the electrochemical reaction, the 3D structure can provide a short diffusion path for fast ion transport, and the highly conductive nanometal may serve as a backbone for facile electron transfer. In this work, a novel polypyrrole (PPy) shell@3D‐Ni‐core composite is developed to enhance the electrochemical performance of conventional PPy. With the introduction of a Ni metal core, the as‐prepared material exhibits a high specific capacitance (726 F g?1 at a charge/discharge rate of 1 A g?1), good rate capability (a decay of 33 % in Csp with charge/discharge rates increasing from 1 to 20 A g?1), and high cycle stability (only a small decrease of 4.2 % in Csp after 1000 cycles at a scan rate of 100 mV s?1). Furthermore, an aqueous symmetric supercapacitor device is fabricated by using the as‐prepared composite as electrodes; the device demonstrates a high energy density (≈21.2 Wh kg?1) and superior long‐term cycle ability (only 4.4 % and 18.6 % loss in Csp after 2000 and 5000 cycles, respectively). 相似文献
18.
Yin Pengpeng Liu Chang Wang Ying Guan Lei Chen Xian Xiong Xuejia Jin Hongzhe 《Russian Journal of General Chemistry》2021,91(5):897-903
Russian Journal of General Chemistry - A dinuclear Tb complex, Tb2(H2L)3(phen)2 (1), and two similar N-donor coordination complexes, Fe(phen)3·HL (2), Fe(bipy)3·HL·5H2O (3) (Na2H2L =... 相似文献
19.
20.
Luo Dajuan Liu Bingqian Gao Rong Su Lixia Su Yonghuan 《Journal of Solid State Electrochemistry》2022,26(3):749-759
Journal of Solid State Electrochemistry - Cortisol, a steroid hormone, has been confirmed as a kind of biomarker that reflects the stress response of psychobiology and related adverse health... 相似文献