全文获取类型
收费全文 | 1026篇 |
免费 | 10篇 |
专业分类
化学 | 533篇 |
晶体学 | 3篇 |
力学 | 136篇 |
数学 | 66篇 |
物理学 | 298篇 |
出版年
2022年 | 8篇 |
2021年 | 22篇 |
2020年 | 7篇 |
2019年 | 20篇 |
2018年 | 30篇 |
2017年 | 37篇 |
2016年 | 32篇 |
2015年 | 27篇 |
2014年 | 32篇 |
2013年 | 54篇 |
2012年 | 43篇 |
2011年 | 55篇 |
2010年 | 37篇 |
2009年 | 23篇 |
2008年 | 45篇 |
2007年 | 38篇 |
2006年 | 46篇 |
2005年 | 30篇 |
2004年 | 26篇 |
2003年 | 30篇 |
2002年 | 27篇 |
2001年 | 18篇 |
2000年 | 14篇 |
1999年 | 14篇 |
1998年 | 13篇 |
1997年 | 13篇 |
1995年 | 12篇 |
1994年 | 10篇 |
1993年 | 11篇 |
1992年 | 9篇 |
1991年 | 18篇 |
1990年 | 10篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 16篇 |
1984年 | 12篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1979年 | 8篇 |
1978年 | 15篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1975年 | 12篇 |
1974年 | 7篇 |
1973年 | 11篇 |
1971年 | 10篇 |
1969年 | 10篇 |
1967年 | 7篇 |
排序方式: 共有1036条查询结果,搜索用时 16 毫秒
51.
Georgiy O. Kachkovskyi Oleg I. Kolodiazhnyi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):2238-2242
Two synthetic routes to phosphonic analogues of indoprofen, a nonsteroidal anti-inflammatory drug, were developed by the cyclization of aniline 2 (method A) and by the Arbuzov reaction of corresponding alkylchloride 3 with triethylphosphite (method B). 相似文献
52.
53.
V. A. Beloshenko V. N. Varyukhin V. Yu. Dmitrenko Yu. I. Nepochatykh V. Z. Spuskanyuk A. N. Cherkasov B. A. Shevchenko 《Technical Physics》2009,54(12):1790-1794
The structure and magnetic properties of Cu-Fe fiber composites prepared by packet hydrostatic extrusion are studied. The
number of armco-iron fibers in the copper matrix attained n ∼ 8 × 1010, and rated diameter d of fibers varied from 2 mm to 3 nm. A correlation is observed between the magnetization hysteresis curves and low-frequency
magnetic susceptibility obtained on samples with various values of d. It is shown that the magnetic properties of composites in the submicrometer range of d values are satisfactorily described in the magnetization reversal theory for small ferromagnetic particles. 相似文献
54.
55.
Vladimir Ya Shevchenko 《Structural chemistry》2012,23(4):943-944
There is a special collection of contribution in the August 2012 issue of Structural Chemistry honoring the Swedish crystallographer Sten Andersson. This Encomium emphasizes the exemplary characteristics of his oeuvre. 相似文献
56.
57.
Paul Podsiadlo Galyna V. Krylova Arnaud Demortière Elena V. Shevchenko 《Journal of nanoparticle research》2011,13(1):15-32
In this article, we review the state-of-the-art in the preparation and characterization of multicomponent self-assembled superlattices
of colloidal nanoparticles with core sizes in the range of 2–20 nm and interparticle spacing less than 2 nm down to intimate
contact stemming from sintering. Several aspects of the field are discussed, including: structural organization, the role
of particle size distribution, key interparticle forces at play, and methods of investigation of the structures. Contrary
to the extensively studied colloidal crystals composed of microscale particles, the nanoparticles possess unique size-dependent
properties, such as electronic, optical, or magnetic, which when combined into periodic structures can potentially lead to
new collective states stemming from precise positioning of the nanocolloids. As such, we examine a number of emerging applications
of this new class of metamaterials. Finally, we speculate on the potential impact of these materials, the new directions,
and the challenges for the researchers. 相似文献
58.
59.
60.
V. V. Shamshutdinova A. S. Kiyko S. N. Shevchenko B. F. Samsonov A. N. Omelyanchouk 《Russian Physics Journal》2008,51(6):578-586
The dynamics of a quantum two-state system (qubit) with external control bias pulses of special shapes is considered. The bias pulses represent the potentials for which the Schrödinger equation can be solved exactly. The probability to register a definite direction of the current in a loop and its time-averaged values are calculated for the flux qubit; calculations are performed both analytically and numerically in the presence of relaxation and decoherence within the framework of the density matrix formalism. It is demonstrated that there exist external bias pulses for which the definite current direction probability is a monotonically increasing function of time that approaches a limiting value exceeding 1/2. The probability to find the system in the excited state is calculated, and the possibility of inverse population in a properly driven two-state system is demonstrated given that the relaxation and decoherence rates are small enough. 相似文献