全文获取类型
收费全文 | 16025篇 |
免费 | 2750篇 |
国内免费 | 2187篇 |
专业分类
化学 | 11624篇 |
晶体学 | 305篇 |
力学 | 1012篇 |
综合类 | 174篇 |
数学 | 1552篇 |
物理学 | 6295篇 |
出版年
2024年 | 37篇 |
2023年 | 283篇 |
2022年 | 566篇 |
2021年 | 599篇 |
2020年 | 736篇 |
2019年 | 659篇 |
2018年 | 597篇 |
2017年 | 548篇 |
2016年 | 801篇 |
2015年 | 837篇 |
2014年 | 1096篇 |
2013年 | 1280篇 |
2012年 | 1351篇 |
2011年 | 1462篇 |
2010年 | 1084篇 |
2009年 | 947篇 |
2008年 | 1157篇 |
2007年 | 1041篇 |
2006年 | 924篇 |
2005年 | 750篇 |
2004年 | 551篇 |
2003年 | 483篇 |
2002年 | 429篇 |
2001年 | 371篇 |
2000年 | 318篇 |
1999年 | 280篇 |
1998年 | 210篇 |
1997年 | 212篇 |
1996年 | 228篇 |
1995年 | 165篇 |
1994年 | 141篇 |
1993年 | 129篇 |
1992年 | 100篇 |
1991年 | 93篇 |
1990年 | 93篇 |
1989年 | 59篇 |
1988年 | 58篇 |
1987年 | 49篇 |
1986年 | 46篇 |
1985年 | 36篇 |
1984年 | 26篇 |
1983年 | 18篇 |
1982年 | 21篇 |
1981年 | 15篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1975年 | 5篇 |
1974年 | 5篇 |
1970年 | 12篇 |
1937年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
141.
Pan L Woodlock EB Wang X Lam KC Rheingold AL 《Chemical communications (Cambridge, England)》2001,(18):1762-1763
Structurally distinct coordination polymers [Ag(bpp)]ClO4 1 and [Ag(bpp)]PF6 2 [bpp = 1,3-bis(4-pyridyl)propane] have been assembled; the conversion of 1 into 2 on treatment with NaPF6 is driven by argentophilic interactions and is the first such transformation reported for silver(I)-organic coordination polymers. 相似文献
142.
The recent progress of wide bandgap (WBG) donor polymers for non-fullerene polymer solar cells (NF-PSCs) were reviewed in detail, which was classified by D-type and D-A type molecular backbones to discuss the related structure-property correlations and put forward an outlook for future innovations. 相似文献
143.
144.
Ying Wang Pu Xiao Gang Qiang Wu Su Qing Shi Jun Nie 《中国化学快报》2007,18(8):977-980
A benzophenone derivative photoinitiator, HBP-TDI-HQ-TDI-HBP (HTCTH), was synthesized based on 4-hydroxy benzophenone (HBP), toluene-2,4-diisocyanate (TDI) and hydroquinone (HQ). HTCTH was a more effective photoinitiator which had longer wavelength absorption in the UV-vis absorption spectra than the low molecular counterpart benzophenone (BP). It showed that both rate of polymerization (Rp) and final conversion (P) increased with increase of amine and HTCTH concentration in photopolymerization. 相似文献
145.
Junfeng Zhou Xiaochen Dong Tao Chen Qiang Yang Qiaohua Tan Jianjun Wang 《European Polymer Journal》2007,43(5):2088-2095
A series of well-defined two-armed polymers containing a crown ether core, poly(stearyl methacrylate)-crown ether-poly(stearyl methacrylate) (PSMA-crown-PSMA), with different molecular weight were synthesized via atom transfer radical polymerization (ATRP). The resultant polymers were characterized by 1H NMR and GPC. The self-assembly behaviors of this kind of polymer in selective solvents were studied by TEM, and it was found that polymers with different molecular weight can directly self-assemble into hollow spheres, solid spheres and a monolayer film with regular pores by varying molecular weight and water content. The possible molecular packing motels for their self-assembly behaviors were proposed. 相似文献
146.
147.
Xie M Liu HH Chen P Zhang ZL Wang XH Xie ZX Du YM Pan BQ Pang DW 《Chemical communications (Cambridge, England)》2005,(44):5518-5520
A simple and convenient method for the construction of CdSe/ZnS-labeled polysaccharides as bioprobes were developed, which are highly biocompatible and photostable, and have been proven to be suitable for live cell imaging. 相似文献
148.
149.
150.