全文获取类型
收费全文 | 1607篇 |
免费 | 78篇 |
国内免费 | 3篇 |
专业分类
化学 | 1272篇 |
晶体学 | 24篇 |
力学 | 21篇 |
数学 | 87篇 |
物理学 | 284篇 |
出版年
2023年 | 14篇 |
2022年 | 17篇 |
2021年 | 11篇 |
2020年 | 32篇 |
2019年 | 29篇 |
2018年 | 20篇 |
2017年 | 10篇 |
2016年 | 45篇 |
2015年 | 30篇 |
2014年 | 49篇 |
2013年 | 75篇 |
2012年 | 97篇 |
2011年 | 147篇 |
2010年 | 65篇 |
2009年 | 58篇 |
2008年 | 113篇 |
2007年 | 81篇 |
2006年 | 98篇 |
2005年 | 93篇 |
2004年 | 91篇 |
2003年 | 72篇 |
2002年 | 63篇 |
2001年 | 26篇 |
2000年 | 20篇 |
1999年 | 15篇 |
1998年 | 11篇 |
1997年 | 17篇 |
1996年 | 11篇 |
1995年 | 10篇 |
1994年 | 15篇 |
1992年 | 15篇 |
1991年 | 13篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 12篇 |
1986年 | 7篇 |
1985年 | 11篇 |
1984年 | 15篇 |
1983年 | 11篇 |
1982年 | 11篇 |
1981年 | 14篇 |
1980年 | 9篇 |
1979年 | 19篇 |
1978年 | 10篇 |
1977年 | 9篇 |
1976年 | 9篇 |
1973年 | 7篇 |
1971年 | 7篇 |
1970年 | 6篇 |
1969年 | 8篇 |
排序方式: 共有1688条查询结果,搜索用时 15 毫秒
1.
Watanabe Sou Senzaki Tatsuya Shibata Atsuhiro Nomura Kazunori Takeuchi Masayuki Nakatani Kiyoharu Matsuura Haruaki Horiuchi Yusuke Arai Tsuyoshi 《Journal of Radioanalytical and Nuclear Chemistry》2019,322(3):1273-1277
Journal of Radioanalytical and Nuclear Chemistry - Extraction chromatography flow-sheet employing octyl(phenyl)-N,N-diisobutylcarbonoylmethylphosphine oxide and bis(2-ethylhexyl) hydrogen phosphate... 相似文献
2.
S. Koh K. Konishi Y. Shiraki 《Physica E: Low-dimensional Systems and Nanostructures》2004,21(2-4):440
Self-assembled GeSiC dots stacked on a Ge hut-cluster layer buried in Si have been investigated. The critical thickness for formation of GeSiC dots is reduced owing to the strain fields from the buried hut-clusters. By utilizing the stacked structure, the dot size is decreased and the uniformity is improved. The highest density of the GeSiC dots with stacked structures is 7.4×1010 cm−2, which is six times larger than that of single GeSiC dots. The formation of the self-assembled GeSiC dots is strongly influenced by being stacked with buried Ge dots as well as C incorporation. 相似文献
3.
Tsuyoshi Kitamura 《Tetrahedron》2004,60(43):9649-9657
Synthesis of (+)-anthramycin was examined. A pyrrolobenzodiazepine skeleton could be synthesized by reductive cyclization of pyrrolidine derivative, which was obtained by enyne metathesis. The conjugated enamide ester part of (+)-anthramycin derivative was constructed by cross-metathesis. 相似文献
4.
5.
Tsuyoshi Katayama 《Queueing Systems》1992,11(3):299-306
This paper derives a conservation law for mean waiting times in a single-server multi-class service queueing system (M
X/G/1 type queue) with setup times which may be dependent on multiple customer classes and its arrival batch size by using the work decomposition property in the queueing system with vacations. 相似文献
6.
We investigate low-temperature behaviors of a system with chirality-pair interaction on a one-dimensional lattice. In the course of the investigation, we evaluate asymptotic forms of the characteristic values of the integral equation satisfied by the Mathieu functions. It turns out that the low-temperature behavior of correlation length of the chirality-pair correlation function is different from the one for the Ising model of spin ±1 but akin to the one for the Ising model of infinite spin. 相似文献
7.
8.
9.
K. M. A. Salam Hidekazu Konishi Masahiro Mizuno Hisashi Fukuda Shigeru Nomura 《Applied Surface Science》2002,190(1-4):88-95
Polycrystalline (1−x)Ta2O5−xTiO2 thin films were formed on Si by metalorganic decomposition (MOD) and annealed at various temperatures. As-deposited films were in the amorphous state and were completely transformed to crystalline after annealing above 600 °C. During crystallization, a thin interfacial SiO2 layer was formed at the (1−x)Ta2O5−xTiO2/Si interface. Thin films with 0.92Ta2O5–0.08TiO2 composition exhibited superior insulating properties. The measured dielectric constant and dissipation factor at 1 MHz were 9 and 0.015, respectively, for films annealed at 900 °C. The interface trap density was 2.5×1011 cm−2 eV−1, and flatband voltage was −0.38 V. A charge storage density of 22.8 fC/μm2 was obtained at an applied electric field of 3 MV/cm. The leakage current density was lower than 4×10−9 A/cm2 up to an applied electric field of 6 MV/cm. 相似文献
10.
We propose a self-aligned imaging system (SAIS) using phase conjugate readout from an elementary holographic grating. The SAIS provides a huge amount of interconnections between a lot of points on two corresponding imaging planes without troublesome mechanical alignment. In the SAIS, a hologram for one-to-one interconnection is used for many-to-many interconnections. In addition, the SAIS has the capability of correcting aberration. Preliminary experiments verify the principle and the capability of the SAIS. 相似文献