全文获取类型
收费全文 | 798篇 |
免费 | 3篇 |
专业分类
化学 | 260篇 |
晶体学 | 35篇 |
力学 | 33篇 |
数学 | 120篇 |
物理学 | 353篇 |
出版年
2022年 | 8篇 |
2021年 | 12篇 |
2020年 | 8篇 |
2019年 | 15篇 |
2018年 | 18篇 |
2017年 | 18篇 |
2016年 | 34篇 |
2015年 | 11篇 |
2014年 | 30篇 |
2013年 | 35篇 |
2012年 | 24篇 |
2011年 | 34篇 |
2010年 | 30篇 |
2009年 | 33篇 |
2008年 | 21篇 |
2007年 | 30篇 |
2006年 | 17篇 |
2005年 | 12篇 |
2004年 | 27篇 |
2003年 | 26篇 |
2002年 | 23篇 |
2001年 | 24篇 |
2000年 | 12篇 |
1999年 | 12篇 |
1998年 | 13篇 |
1997年 | 14篇 |
1996年 | 17篇 |
1995年 | 16篇 |
1994年 | 9篇 |
1993年 | 7篇 |
1992年 | 8篇 |
1991年 | 11篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 10篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1978年 | 8篇 |
1976年 | 8篇 |
1974年 | 10篇 |
1973年 | 9篇 |
1972年 | 7篇 |
1971年 | 9篇 |
1970年 | 13篇 |
1969年 | 9篇 |
1967年 | 16篇 |
1966年 | 5篇 |
1965年 | 7篇 |
排序方式: 共有801条查询结果,搜索用时 15 毫秒
1.
The phenomenon of plasmon resonance in a nanosphere and a nanospheroid is considered. As is known, this phenomenon does not depend explicitly on the size of these nanoparticles. However, it is shown that, actually, the resonance conditions are determined by the diameter of the nanosphere and by the length of the major axis of the nanospheroid. 相似文献
2.
An interrogator of Bragg sensors based on a narrow-band tunable erbium laser is developed. The laser characteristics enable one to interrogate up to 45 temperature sensors in a range of 100°C with an error of no greater than 1°C. 相似文献
3.
A. A. Vlasov 《Theoretical and Mathematical Physics》1995,104(2):1043-1050
The first-order approximations for the internal and external fields of an expanding ball are evaluated in the scalar field model and in the relativistic theory of gravity. The similarity of the corresponding solutions is pointed out. It is suggested how the nonstatic properties possessed by solutions in the original inertial coordinates can be observed experimentally.Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 104, No. 2, pp. 348–355, August, 1995. 相似文献
4.
5.
We study regimes of total reflection of a plane wave to the diffraction lobe in the case where the wave is incident on a corrugated
metal surface or a corrugated interface of two dielectric media. The purpose is to analyze the influence of both the corrugation
shape and losses in the medium on the characteristics of the regimes of total reflection to the diffraction lobe. We consider
a number of corrugation profiles differing from the sinusoid by the resonance-region width and the presence of additional
elements, namely, (i) the profiles having pair resonance regions with scale of the order of the wavelength, for which qualitatively
new diffraction regimes compared with those observed for the sinusoidal interface can be realized due to interaction of waves,
and (ii) the profiles comprising small-scale deviations, which can be a model of actual gratings. To study the influence of
losses in the problem of scattering from a corrugated interface of dielectrics, the dielectric permittivity is assumed complex.
We compare the obtained results with data for a sinusoidal profile and loss-free media.
__________
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 49, No. 5, pp. 391–405, May 2006. 相似文献
6.
Based on the equations of elasticity theory and hydroacoustics, we calculated the field structures arising when a plane wave is incident on an infinite cylindrical cavity with circular cross section filled by a liquid. The variable pressure component on the cavity axis for longitudinal and shear incident waves is determined. 相似文献
7.
One of the main approaches employed to reach fast chromatographic separation is based on using columns containing up to 1000 capillaries with the diameter size down to 10-100 microm. The efficiency of such columns depends on the dispersion of the capillary radius and on the way of the liquid-film loading. We present general equations describing these effects. Specifically, we show theoretically and experimentally that the separation efficiency can be improved by using the loading methods specially designed in order to take into account correlation between the film thickness and capillary radius. 相似文献
8.
Legin K. A. Bolotov A. M. Legin A. V. Vlasov Yu. G. 《Russian Journal of Applied Chemistry》2004,77(5):716-720
New chalcogenide glasses of the system 0.5AgI-(0.5 - x)Sb2S3-x
MS containing cadmium, man- ganese, and zinc sulfides were obtained. The high purity of these materials and their glassy state were proved by X-ray analysis and X-ray fluorescence energy-dispersive spectroscopy. The impedance of the glasses obtained was measured within a wide range of frequencies, and the dependences of the conductivity on the composition of glasses were studied. New potentiometric sensors based the new glasses were developed, and an electrochemical experiment was carried out. 相似文献
9.
G. K. Vlasov D. N. Vylegzhanin N. A. Dolgikh E. I. Chizhikoya 《International Journal of Infrared and Millimeter Waves》1995,16(1):33-73
The possibility of the IR-radiation detecting in crystals of direct-gap semiconductors, caused by effects of IR-quenching of probe visible-range radiation within the region of a crystal relative transparency, is studied both theoretically and experimentally. The comparison of some mechanisms investigated allows to conclude that the most probable explanation of the IR-quenching effect, experimentally observed in the CdS crystal, is the mechanism of probe radiation absorption with photon energy deficit with respect to exciton resonance, which is eliminated due to exchange interaction of a free exciton in the intermediate state with spherical excitons localized on manyelectron atoms of impurity. 相似文献
10.
The paper is devoted to research and development in the field of chalcogenide glass chemical sensors for determination of heavy metal ions in solution. The overview of the solid-state scientific approach and research design of the sensing materials is followed by the original results of the analytical application of the chalcogenide glass sensors for laboratory analysis, industrial control and environmental monitoring. 相似文献