全文获取类型
收费全文 | 658篇 |
免费 | 28篇 |
国内免费 | 3篇 |
专业分类
化学 | 541篇 |
晶体学 | 5篇 |
力学 | 10篇 |
数学 | 76篇 |
物理学 | 52篇 |
综合类 | 5篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 21篇 |
2021年 | 45篇 |
2020年 | 23篇 |
2019年 | 24篇 |
2018年 | 19篇 |
2017年 | 22篇 |
2016年 | 29篇 |
2015年 | 33篇 |
2014年 | 26篇 |
2013年 | 48篇 |
2012年 | 45篇 |
2011年 | 61篇 |
2010年 | 25篇 |
2009年 | 31篇 |
2008年 | 32篇 |
2007年 | 37篇 |
2006年 | 28篇 |
2005年 | 28篇 |
2004年 | 25篇 |
2003年 | 19篇 |
2002年 | 17篇 |
2001年 | 9篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1969年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有689条查询结果,搜索用时 578 毫秒
51.
By the application of the coinduction method as well as the Magri method to the ideal of real Hilbert–Schmidt operators we construct the hierarchies of integrable Hamiltonian systems on Banach Lie–Poisson spaces which consist of such types of operators. We also discuss their algebraic and analytic properties and solve them in dimensions, N=2,3,4. 相似文献
52.
Optimized conditions for copper-catalyzed N-arylation of methyl pyroglutamate are described. These studies permitted the synthesis of methyl N-naphthylpyroglutamate, which was then cyclized to a ketone. The known dehydration of amidoketones by PPA was extended to this new scaffold to lead to a novel condensed benzo[de]quinoline with potential antioxidative activity. 相似文献
53.
54.
55.
JPC – Journal of Planar Chromatography – Modern TLC - Fatty acids from pentanoic to tricosanoic have been separated on RP-18 HPTLC plates, with and without concentrating zone, with... 相似文献
56.
JPC – Journal of Planar Chromatography – Modern TLC - The chromatographic behavior of the phenolic drugs niclosamide, hexachlorophene, ibuprofen, pentazocine, ethamivan, bithionol,... 相似文献
57.
Dr. Gleb I. Tselikov Prof. Dr. Victor Yu Timoshenko Prof. Dr. Leonid A. Golovan Dr. Jürgen Plenge Alina M. Shatalova Georgiy A. Shandryuk Irina Yu Kutergina Alexey S. Merekalov Prof. Dr. Eckart Rühl Prof. Dr. Raisa V. Talroze 《Chemphyschem》2015,16(5):1071-1078
The photoluminescence (PL) of CdSe quantum dots (QDs) that form stable nanocomposites with polymer liquid crystals (LCs) as smectic C hydrogen‐bonded homopolymers from a family of poly[4‐(n‐acryloyloxyalkyloxy)benzoic acids] is reported. The matrix that results from the combination of these units with methoxyphenyl benzoate and cholesterol‐containing units has a cholesteric structure. The exciton PL band of QDs in the smectic matrix is redshifted with respect to QDs in solution, whereas a blueshift is observed with the cholesteric matrix. The PL lifetimes and quantum yield in cholesteric nanocomposites are higher than those in smectic ones. This is interpreted in terms of a higher order of the smectic matrix in comparison to the cholesteric one. CdSe QDs in the ordered smectic matrix demonstrate a splitting of the exciton PL band and an enhancement of the photoinduced differential transmission. These results reveal the effects of the structure of polymer LC matrices on the optical properties of embedded QDs, which offer new possibilities for photonic applications of QD–LC polymer nanocomposites. 相似文献
58.
59.
60.
Alina Sionkowska Sławomir Skrzyński Krzysztof Śmiechowski Agata Kołodziejczak 《先进技术聚合物》2017,28(1):4-9
This review reports recent advances in the versatile application of collagen. Collagen materials have attracted great attention because they exhibit properties required in cosmetic preparations, in the biomedical field, and in the tanning industry leading to leather production. Herein, the structure and application of collagen are discussed in general, and detailed examples are also drawn from scientific literature and practical work. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献