全文获取类型
收费全文 | 670篇 |
免费 | 8篇 |
国内免费 | 3篇 |
专业分类
化学 | 309篇 |
晶体学 | 2篇 |
力学 | 19篇 |
数学 | 123篇 |
物理学 | 228篇 |
出版年
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 10篇 |
2019年 | 21篇 |
2018年 | 20篇 |
2017年 | 19篇 |
2016年 | 30篇 |
2015年 | 18篇 |
2014年 | 20篇 |
2013年 | 30篇 |
2012年 | 36篇 |
2011年 | 32篇 |
2010年 | 26篇 |
2009年 | 20篇 |
2008年 | 26篇 |
2007年 | 30篇 |
2006年 | 23篇 |
2005年 | 23篇 |
2004年 | 19篇 |
2003年 | 17篇 |
2002年 | 22篇 |
2001年 | 17篇 |
2000年 | 20篇 |
1999年 | 7篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 8篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1992年 | 7篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1987年 | 11篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 11篇 |
1976年 | 10篇 |
1973年 | 6篇 |
1972年 | 3篇 |
1971年 | 7篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1958年 | 3篇 |
排序方式: 共有681条查询结果,搜索用时 31 毫秒
1.
2.
Optics and Spectroscopy - The Raman spectra of an Rb2KLuF6 crystal are studied in the temperature range from 8 to 375 K, which includes two phase transitions: one of which proceeds from a cubic to... 相似文献
3.
4.
5.
Dr. Vasily G. Panferov Nikita A. Ivanov Dr. Tony Mazzulli Dr. Davor Brinc Dr. Vathany Kulasingam Prof. Sergey N. Krylov 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2023,135(2):e202215548
Lateral flow immunoassay (LFIA) is a rapid, simple, and inexpensive point-of-need method. A major limitation of LFIA is a high limit of detection (LOD), which impacts its diagnostic sensitivity. To overcome this limitation, we introduce a signal-enhancement procedure that is performed after completing LFIA and involves controllably moving biotin- and streptavidin-functionalized gold nanoparticles by electrophoresis. The nanoparticles link to immunocomplexes forming multilayer aggregates on the test strip, thus, enhancing the signal. Here, we demonstrate lowering the LOD of hepatitis B surface antigen from approximately 8 to 0.12 ng mL−1, making it clinically acceptable. Testing 118 clinical samples for hepatitis B showed that signal enhancement increased the diagnostic sensitivity of LFIA from 73 % to 98 % while not affecting its 95 % specificity. Electrophoresis-driven enhancement of LFIA is universal (antigen-independent), takes two minutes, and can be performed by an untrained person. 相似文献
6.
A. G. Gerbst V. B. Krylov D. Z. Vinnitsky N. E. Ustyuzhanina N. E. Nifantiev 《Russian Chemical Bulletin》2015,64(12):2763-2768
The paper deals with the comparison of different theoretical methods for the calculation of stabilization energies of glycosyl cations from fucofuranoside glycosyl donors containing different protecting groups at atom O(3). The experimental and calculated data on stereoselectivity of glycosylation were compared. The formation of the stabilized glycosyl cations is considered as one of the possible steps of glycosylation reaction, which exerts influence on the stereoselectivity of the process and makes it possible to obtain difficultly accessible 1,2-cis-glycosides. Semi-empirical and ab initio methods without allowance for the electron correlation underestimate the stabilization energy values. The allowance for the electron correlation in the MP2 approximation, as well as the calculations by density functional theory, allowed us to obtain the data corresponding to the experimentally observed stereoselectivity. 相似文献
7.
Krylov A. S. Tolstyakov V. V. Gurzhiy V. V. Dogadina A. V. 《Russian Journal of General Chemistry》2021,91(1):72-76
Russian Journal of General Chemistry - A series of new 6-phosphonylated 1H-imidazo[2,1-c][1,2,4]triazoles was synthesized by the reaction of diethyl chloroethynylphosphonate with 2-substituted... 相似文献
8.
Chizhov A. O. Khatuntseva E. A. Krylov V. B. Petruk M. I. Nifantiev N. E. 《Russian Chemical Bulletin》2017,66(9):1686-1690
Russian Chemical Bulletin - High-resolution electrospray ionization mass spectra (MS and MS/MS) of a series of glycoconjugates containing biotin and oligomannuronopyranosyl residues linked via a... 相似文献
9.
Georgios Velkos Denis S. Krylov Kyle Kirkpatrick Lukas Spree Vasilii Dubrovin Bernd Büchner Stanislav M. Avdoshenko Valeriy Bezmelnitsyn Sean Davis Paul Faust James Duchamp Harry C. Dorn Alexey A. Popov 《Angewandte Chemie (International ed. in English)》2019,58(18):5891-5896
The azafullerene Tb2@C79N is found to be a single‐molecule magnet with a high 100‐s blocking temperature of magnetization of 24 K and large coercivity. Tb magnetic moments with an easy‐axis single‐ion magnetic anisotropy are strongly coupled by the unpaired spin of the single‐electron Tb?Tb bond. Relaxation of magnetization in Tb2@C79N below 15 K proceeds via quantum tunneling of magnetization with the characteristic time τQTM=16 462±1230 s. At higher temperature, relaxation follows the Orbach mechanism with a barrier of 757±4 K, corresponding to the excited states, in which one of the Tb spins is flipped. 相似文献
10.