全文获取类型
收费全文 | 1091篇 |
免费 | 35篇 |
国内免费 | 2篇 |
专业分类
化学 | 770篇 |
晶体学 | 16篇 |
力学 | 5篇 |
数学 | 58篇 |
物理学 | 279篇 |
出版年
2023年 | 9篇 |
2022年 | 12篇 |
2021年 | 16篇 |
2020年 | 21篇 |
2019年 | 15篇 |
2018年 | 10篇 |
2017年 | 11篇 |
2016年 | 22篇 |
2015年 | 16篇 |
2014年 | 23篇 |
2013年 | 49篇 |
2012年 | 68篇 |
2011年 | 74篇 |
2010年 | 35篇 |
2009年 | 20篇 |
2008年 | 63篇 |
2007年 | 50篇 |
2006年 | 54篇 |
2005年 | 44篇 |
2004年 | 39篇 |
2003年 | 42篇 |
2002年 | 28篇 |
2001年 | 30篇 |
2000年 | 23篇 |
1999年 | 17篇 |
1998年 | 12篇 |
1997年 | 11篇 |
1996年 | 12篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1993年 | 23篇 |
1992年 | 26篇 |
1991年 | 20篇 |
1990年 | 17篇 |
1989年 | 16篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 19篇 |
1984年 | 14篇 |
1983年 | 13篇 |
1982年 | 5篇 |
1981年 | 8篇 |
1980年 | 14篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1977年 | 11篇 |
1976年 | 6篇 |
1974年 | 9篇 |
1973年 | 7篇 |
排序方式: 共有1128条查询结果,搜索用时 15 毫秒
1.
The chemiluminescence (CL) intensities of various indole derivatives substituted with a glyoxylyl group at the 3-position and a hydroxyl group at the 5-position of the indole ring were compared upon the addition of H2O2 in alkaline media. The CL intensities of 3-indoleglyoxylyl chloride, 3-indoleglyoxylic acid, 5-hydroxyindole and 5-benzyloxyindole in CH3CN were 5.9-, 48-, 5.9- and 3.3-fold stronger than that of 3-methylindole. A lasting CL of 3-indoleglyoxylyl chloride was found. Under appropriate conditions, the CL emission reached a maximum within 10 min after the addition of H2O2 in the presence of NaOH, and the intensity was retained for 25 min. One of the final products via the CL reaction of 3-indoleglyoxylyl chloride was indole-3-carboxylic acid. 3-Indoleglyoxylyl chloride emitted light by decompositions via both dioxetane and dioxetanedione. An enhancement effect of beta-cyclodextrin and bovine serum albumin on the CL of 3-indoleglyoxylyl chloride was also found. 相似文献
2.
3.
Statistical Inference for Stochastic Processes - 相似文献
4.
5.
G. M. Luke L. P. Le B. J. Sternlieb Y. J. Uemura J. H. Brewer R. Kadono R. F. Kiefl S. R. Kreitzman T. M. Riseman C. E. Stronach M. Davis S. Uchida H. Takagi Y. Tokura Y. Hidaka T. Murakami E. A. Early J. T. Markert M. B. Maple C. L. Seaman 《Hyperfine Interactions》1991,63(1-4):311-317
We report muon spin relaxation/rotation measurements on sintered powder samples of Nd2−x
Ce
x
CuO4−y
and a large single crystal of Nd2CuO4−y
. We find an electronic phase diagram which is quite similar to that of hole-doped superconductors such as La2−x
Sr
x
CuO4−y
, although the doping of electrons into the system is less efficient in destroying the static moments on the copper spins.
Static magnetic order in Nd2CuO4−y
appears below about 250 K, and two spin reorientations are seen atT=75 K andT=35 K. Measurements of the magnetic field penetration depth have been unsuccessful due to the rare-earth paramagnetism of
these materials. 相似文献
6.
K. Takamiya T. Fukunishi R. Tsujito S. Fukutani T. Takahashi S. Shibata S. Uchida 《Journal of Radioanalytical and Nuclear Chemistry》2007,273(1):195-198
The adsorption behavior of fission products to various soils was studied using a multitracer. The multitracer was prepared
by neutron irradiation of 235U. Distribution coefficients of fission products were obtained for seventeen kinds of Japanese soils. It was found that zirconium,
niobium, and rare earth elements show high distribution coefficients for all soil samples, however, elements like alkali metals
show varied values. 相似文献
7.
8.
9.
Synthesis and hypotensive activity of benzopyran derivatives 总被引:1,自引:0,他引:1
M Shiratsuchi K Kawamura T Akashi M Fujii H Ishihama Y Uchida 《Chemical & pharmaceutical bulletin》1987,35(2):632-641
10.
T. Takahashi S. Uchida H. Hayashi S. Matsuoka K. Tomita N. Kurosawa 《Journal of Radioanalytical and Nuclear Chemistry》2007,272(3):451-454
For the assessment of a public impact caused by radionuclides released from nuclear facilities, a dynamic compartment model
was developed for prediction of behavior of radioiodine in air, paddy field and rice plant system. The transfer coefficients
among compartments were determined by some experimental data and assumptions for each chemical form of iodine. A verification
of the model was carried out by some case studies. 相似文献