全文获取类型
收费全文 | 709篇 |
免费 | 18篇 |
国内免费 | 1篇 |
专业分类
化学 | 515篇 |
晶体学 | 14篇 |
力学 | 25篇 |
数学 | 14篇 |
物理学 | 160篇 |
出版年
2022年 | 7篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 14篇 |
2014年 | 14篇 |
2013年 | 32篇 |
2012年 | 24篇 |
2011年 | 47篇 |
2010年 | 16篇 |
2009年 | 20篇 |
2008年 | 32篇 |
2007年 | 36篇 |
2006年 | 36篇 |
2005年 | 47篇 |
2004年 | 34篇 |
2003年 | 35篇 |
2002年 | 23篇 |
2001年 | 13篇 |
2000年 | 15篇 |
1998年 | 6篇 |
1997年 | 8篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 15篇 |
1993年 | 15篇 |
1992年 | 6篇 |
1991年 | 15篇 |
1990年 | 8篇 |
1989年 | 4篇 |
1988年 | 9篇 |
1987年 | 13篇 |
1986年 | 13篇 |
1985年 | 10篇 |
1984年 | 16篇 |
1983年 | 3篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 5篇 |
1978年 | 7篇 |
1977年 | 6篇 |
1974年 | 5篇 |
1973年 | 4篇 |
1968年 | 3篇 |
1965年 | 4篇 |
1963年 | 5篇 |
排序方式: 共有728条查询结果,搜索用时 15 毫秒
91.
Chikara Shito Keitaro Okamoto Yuki Sato Ryuji Watanabe Tomonori Ohashi Kazuhiro Fuchizaki 《高压研究》2013,33(3):499-508
ABSTRACTHigh pressure hydrous phases with distorted rutile-type structure have attracted much interest as potential water reservoirs in the Earth’s mantle. An in-situ X-ray diffraction study of β-CrOOH was performed at high pressures of up to 6.2?GPa and high-temperatures of up to 700?K in order to clarify the temperature effect on compression behaviors of β-CrOOH. The P-V-T data fitted to a Birch–Murnaghan equation of state yielded the following results: isothermal bulk modulus KT0?=?191(4)?GPa, temperature derivative (?KT/?T)P?=??0.04(2)?GPa?K?1, and volumetric thermal expansion coefficient α?=?3.3(2)?×?10?5?K?1. In this study, at 300?K, the a-axis became less compressible at pressures above 1–2?GPa. We found that the pressure where the slopes of a/b and a/c ratios turned positive increased with temperature. This is the first experimental study indicating the temperature dependence of the change in the axial compressibility in distorted rutile-type M3+OOH. 相似文献
92.
93.
A manifold is described which permits the analysis of less than 1 ml of sample solution. Water- and air-compensation methods for the introduction of the carrier stream into the nebulizer are effective in obtaining sensitive and reproducible measurements of magnesium, but air-compensation gives higher peak responses. 相似文献
94.
95.
Yohji Nakatsuji Toshinori Inoue Masato Wada Mitsuo Okahara 《Journal of inclusion phenomena and macrocyclic chemistry》1991,10(3):379-386
A new type of 18-crown-6 derivative having two carboxylic acids on the side arms transported calcium and potassium ions in opposite directions across a dichloromethane membrane by pH control. Calcium and potassium ions were concentrated in the acidic and the basic phases, respectively. The presence of picrate ion in the acidic phase plays an important role in the transport of potassium ion from the acidic to the basic phase. 相似文献
96.
An apparatus and the procedure for cellulose acetate isoelectric focusing were refined and optimized for routine use in clinical laboratories. The space in the electrophoretic chamber was minimized to maintain high humidity during the run. The water content of the thin cellulose acetate membranes in the chamber was well controlled during isoelectric focusing and the effect of atmospheric carbon dioxide was also excluded. The temperature of the membranes was kept below 2 degrees C, even under conditions of high electric field strength for faster isoelectric focusing of high-molecular-weight proteins. No special training was required for technicians in clinical laboratories to obtain reproducible isoelectric profiles of human serum proteins. 相似文献
97.
98.
D. L. Adams B. Aas E. Bleszynski M. Bleszynski G. Igo C. Newsom Y. Ohashi G. Pauletta F. Sperisen C. A. Whitten Jr. H. Fujisawa M. GazzalyS. J. Greene K. Jones J. B. McClelland N. TanakaH. Hasai K. IwataniS. Ishimoto S. IsagawaA. MasaikeA. OkihanaS. Okumi 《Nuclear Physics A》1988,480(3-4)
We have measured spin correlation parameters that describe the elastic scattering of 800 MeV polarized protons from an L-type polarized deuteron target at laboratory angles below 20°. The measured parameters include the correlated analyzing powers ASL, ALL and ANLL and the proton spin-transfer coefficients C0L,S, C0L,L, CSL,N, CNL,S, CNL,L and CLL,N. The results are compared with single-scattering predictions based on different phase-shift solutions for the nucleon-nucleon scattering matrix. 相似文献
99.
100.