全文获取类型
收费全文 | 1010篇 |
免费 | 24篇 |
国内免费 | 1篇 |
专业分类
化学 | 703篇 |
晶体学 | 16篇 |
力学 | 6篇 |
数学 | 33篇 |
物理学 | 277篇 |
出版年
2023年 | 7篇 |
2022年 | 7篇 |
2021年 | 9篇 |
2020年 | 10篇 |
2019年 | 9篇 |
2018年 | 6篇 |
2017年 | 6篇 |
2016年 | 17篇 |
2015年 | 11篇 |
2014年 | 16篇 |
2013年 | 49篇 |
2012年 | 49篇 |
2011年 | 56篇 |
2010年 | 36篇 |
2009年 | 18篇 |
2008年 | 58篇 |
2007年 | 53篇 |
2006年 | 54篇 |
2005年 | 47篇 |
2004年 | 45篇 |
2003年 | 42篇 |
2002年 | 29篇 |
2001年 | 28篇 |
2000年 | 23篇 |
1999年 | 17篇 |
1998年 | 12篇 |
1997年 | 12篇 |
1996年 | 12篇 |
1995年 | 13篇 |
1994年 | 11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 | 12篇 |
1986年 | 8篇 |
1985年 | 20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 | 12篇 |
1976年 | 6篇 |
1974年 | 8篇 |
1973年 | 9篇 |
排序方式: 共有1035条查询结果,搜索用时 15 毫秒
1.
2.
Statistical Inference for Stochastic Processes - 相似文献
3.
4.
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
5.
Two types of optical current transducers (OCTs) have a bulk Faraday sensor inserted into the gap of an iron core and a porcelain
insulator with optical fiber. The sensor consists of Bi12SiO20 (BSO) single crystal, a polarizer, and an analyzer. The OCTs satisfied the target performance requirement for fault location
and metering and demonstrated maintained performance at some power utilities in Japan and the US. We have developed a fault
location system that immediately detects the fault current with the OCTs, there by locating the fault section. The OCT can
easily replace the existing support insulators for the disconnecting switch without any modifications to structure height
or bus-bar. For metering requiring 0.3% class accuracy, use of a BSO with right optical rotatory power combined with BSO with
left optical rotatory power results in a Faraday sensor with improved temperature characteristics. The OCT demonstrated 0.3%
class accuracy for metering described in the current transformer Specifications of IEEE C57–13, 1993. 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