全文获取类型
收费全文 | 1421篇 |
免费 | 47篇 |
国内免费 | 4篇 |
专业分类
化学 | 1019篇 |
晶体学 | 36篇 |
力学 | 8篇 |
综合类 | 1篇 |
数学 | 92篇 |
物理学 | 316篇 |
出版年
2022年 | 9篇 |
2021年 | 15篇 |
2020年 | 16篇 |
2019年 | 18篇 |
2017年 | 7篇 |
2016年 | 28篇 |
2015年 | 22篇 |
2014年 | 36篇 |
2013年 | 80篇 |
2012年 | 57篇 |
2011年 | 58篇 |
2010年 | 35篇 |
2009年 | 36篇 |
2008年 | 51篇 |
2007年 | 69篇 |
2006年 | 70篇 |
2005年 | 67篇 |
2004年 | 51篇 |
2003年 | 49篇 |
2002年 | 46篇 |
2001年 | 45篇 |
2000年 | 53篇 |
1999年 | 30篇 |
1998年 | 15篇 |
1997年 | 14篇 |
1996年 | 36篇 |
1995年 | 25篇 |
1994年 | 15篇 |
1993年 | 15篇 |
1992年 | 31篇 |
1991年 | 24篇 |
1990年 | 23篇 |
1989年 | 21篇 |
1988年 | 32篇 |
1987年 | 16篇 |
1986年 | 16篇 |
1985年 | 24篇 |
1984年 | 13篇 |
1983年 | 19篇 |
1982年 | 17篇 |
1981年 | 22篇 |
1980年 | 14篇 |
1979年 | 27篇 |
1978年 | 13篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 9篇 |
1974年 | 10篇 |
1973年 | 18篇 |
1972年 | 10篇 |
排序方式: 共有1472条查询结果,搜索用时 0 毫秒
81.
82.
Frontispiece: Picket‐Fence Polythiophene and its Diblock Copolymers that Afford Microphase Separations Comprising a Stacked and an Isolated Polythiophene Ensemble 下载免费PDF全文
83.
Munetaka Iwamura Airi Fukui Koichi Nozaki Hikaru Kuramochi Satoshi Takeuchi Tahei Tahara 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(51):23354-23361
Femtosecond time-resolved absorption and picosecond time-resolved emission measurements were carried out for highly concentrated aqueous solutions of K2[Pt(CN)4] to investigate excited-state dynamics of the [Pt(CN)42−] oligomers formed with metallophilic interactions. Time-resolved absorption spectra exhibit complicated dynamics that are represented with five time constants. Among them, the 90-ps and 400-ps dynamics were assigned to the S1 → T1 intersystem crossing of the trimer and tetramer coexisting in the solution by comparison with the fluorescence decays. Clear oscillations of transient absorption were observed in the first few picoseconds, and the frequency-detected-wavelength 2D analysis revealed that the 135-cm−1 and 65-cm−1 oscillations arise from the Pt–Pt stretch motions of the S1 trimer and S1 tetramer, respectively. The obtained time-resolved spectroscopic data provide a clear view of the excited-state dynamics of the [Pt(CN)42−] oligomers in the femto-/picosecond time region. 相似文献
84.
Sudhir Kumar Keshri Atsuro Takai Tomoya Ishizuka Takahiko Kojima Masayuki Takeuchi 《Angewandte Chemie (International ed. in English)》2020,59(13):5254-5258
The design and synthesis of an enantiomeric pair of 1,8‐diethynylanthracene‐bridged naphthalenediimide (NDI)‐based cyclophanes ( Cyclo‐NDI s) are reported. Each enantiomer of Cyclo‐NDI exhibits a circularly polarized luminescence signal with a relatively large luminescence dissymmetry factor (glum=±8×10?3). We have further investigated the modulation of through‐space electronic communication between co‐facially oriented NDIs in a discrete Cyclo‐NDI with changes in the temperature. Tuning of the electronic communication results from the conformational transformation of monomer‐ versus dimer‐like features of Cyclo‐NDI , as confirmed by UV/Vis, fluorescence, circular dichroic, and NMR spectroscopic analysis. The temperature‐dependent optical response in the Cyclo‐NDI through the conformational transformation could be utilized as a highly sensitive and reversible optical thermometer in a wide temperature range (100 to ?80 °C). 相似文献
85.
86.
Miyauchi Suguru Yamada Shuji Takeuchi Shintaro Tazaki Asahi Kajishima Takeo 《Transport in Porous Media》2022,141(1):185-199
Transport in Porous Media - A concise and accurate prediction method is required for membrane permeability in chemical engineering and biological fields. As a preliminary study on this topic, we... 相似文献
87.
88.
89.
90.