全文获取类型
收费全文 | 1688篇 |
免费 | 9篇 |
国内免费 | 2篇 |
专业分类
化学 | 692篇 |
晶体学 | 34篇 |
力学 | 105篇 |
数学 | 109篇 |
物理学 | 759篇 |
出版年
2021年 | 19篇 |
2020年 | 21篇 |
2019年 | 16篇 |
2018年 | 34篇 |
2017年 | 36篇 |
2016年 | 52篇 |
2014年 | 56篇 |
2013年 | 55篇 |
2012年 | 67篇 |
2011年 | 96篇 |
2010年 | 66篇 |
2009年 | 75篇 |
2008年 | 62篇 |
2007年 | 54篇 |
2006年 | 50篇 |
2005年 | 45篇 |
2004年 | 30篇 |
2003年 | 36篇 |
2002年 | 53篇 |
2001年 | 40篇 |
2000年 | 38篇 |
1998年 | 30篇 |
1997年 | 19篇 |
1996年 | 23篇 |
1995年 | 16篇 |
1994年 | 16篇 |
1993年 | 22篇 |
1991年 | 18篇 |
1990年 | 18篇 |
1989年 | 16篇 |
1988年 | 15篇 |
1987年 | 20篇 |
1986年 | 29篇 |
1985年 | 17篇 |
1984年 | 20篇 |
1983年 | 16篇 |
1982年 | 19篇 |
1981年 | 17篇 |
1979年 | 20篇 |
1977年 | 23篇 |
1976年 | 17篇 |
1975年 | 21篇 |
1974年 | 20篇 |
1973年 | 19篇 |
1972年 | 24篇 |
1971年 | 23篇 |
1970年 | 27篇 |
1969年 | 24篇 |
1968年 | 15篇 |
1967年 | 19篇 |
排序方式: 共有1699条查询结果,搜索用时 203 毫秒
1.
Cyclization of N‐arylcyclopropanecarboxamides into N‐arylpyrrolidin‐2‐ones under electron ionization and in the condensed phase 下载免费PDF全文
2.
G. V. Lebedev 《Physics of Atomic Nuclei》2015,78(11):1223-1226
The neutron power of the reactor of the Yenisei space nuclear power plant is measured in absolute units using the modernized method of correlation analysis during the ground-based tests of the Yenisei prototypes. Results of the experiments are given. The desired result is obtained in a series of experiments carried out at the stage of the plant preparation for tests. The acceptability of experimental data is confirmed by the results of measuring the reactor neutron power in absolute units at the nominal level by the thermal balance during the life cycle tests of the ground prototypes. 相似文献
3.
Lebedev V. T. Serebrov A. P. 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2020,14(1):1-5
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques - A method for studying the magnetic dynamics of endofullerenes M@C2n (2n = 60, 70, …) and their derivatives,... 相似文献
4.
Russian Physics Journal - Electrophysical, morphological, rheological, and structural properties of new polymer composites based on polycaprolactone filled with single-walled carbon nanotubes are... 相似文献
5.
Static Approach to Renormalization Group Analysis of Stochastic Models with Spatially Quenched Noise
Journal of Statistical Physics - A new “static” renormalization group approach to stochastic models of fluctuating surfaces with spatially quenched noise is proposed in which only... 相似文献
6.
Journal of Russian Laser Research - We report some theoretical results on the extinction, absorption, and scattering of light by individual silver and gold nanoparticles of different sizes and... 相似文献
7.
Yablokov M. Yu. Shchegolikhin A. N. Lebedev O. V. Goncharuk G. P. Ozerin A. N. 《Russian Chemical Bulletin》2021,70(9):1816-1821
Russian Chemical Bulletin - Gradient polymer composites were prepared by melt-mixing of carbon black and polypropylene in a compounder and subsequent hot pressing of pellets. The thermally treated... 相似文献
8.
M. V. Suyasova Yu. V. Kul’velis V. T. Lebedev V. P. Sedov 《Russian Journal of Applied Chemistry》2015,88(11):1839-1847
Nature of structuring of aqueous solutions of paramagnetic endofullerenols Gd@C n (OH)38–40 was determined in relation to the concentration and pH factor from small-angle neutron scattering, viscometric, and conductometric data. Molecular fractal clusters of the type of branched polymers were found, with their correlation radius being about 20 nm and aggregation numbers reaching a value of 104. The clusterized systems obtained are promising as a basis for MRI-contrasting agents and other biomedical preparations for diagnostics and therapy. 相似文献
9.
A. A. Chugunova M. B. Kralj O. V. Polyakova V. B. Artaev P. Trebše S. A. Pokryshkin A. T. Lebedev 《Journal of Analytical Chemistry》2017,72(14):1369-1374
Disinfection is an important step in the purification of drinking and swimming pool water. The most common procedure includes chlorination, which efficiently eliminates microorganisms. However, the reaction of active chlorine with dissolved organic matter produces numerous organochlorine compounds posing a hazard to the environment and human health. UV filters belong to emerging contaminants, as their application to skin protection from UV irradiation becomes increasingly popular all over the world. Certain components of UV filters were detected in swimming pools and result in the emergence of new ecotoxicants. In the present study, 40 compounds, including numerous brominated derivatives, which result from the chlorination of avobenzone in sea water, were identified by gas chromatography–high resolution mass spectrometry. In addition, the applicability of photocatalysis to the destruction of chlorination products was studied. The procedure was found to be rather efficient and allows a decrease in the total amount of avobenzone transformation products by a factor of 10. The only compound class demonstrating stability under the applied conditions is exemplified by halogenated acetophenone derivatives. 相似文献
10.
T. P. Smirnova L. V. Yakovkina V. O. Borisov M. S. Lebedev 《Journal of Structural Chemistry》2017,58(8):1573-1580
X-ray photoelectron spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy (over thickness profiling of the elemental and phase compositions of the samples) are used to investigate the elemental and phase compositions, structures, and microstructures of films synthesized in La–Hf–O and Sc–Hf–O systems from organometallic volatile compounds. The dependence of the phase compositions and microstructures of films on the concentration of a doping rare earth element is determined. It is found that lanthanum and scandium doping of hafnium oxide results in the formation of solid solutions of a hightemperature cubic modification. The conditions for obtaining the pyrochlore phase are determined in the nanocrystalline Hf–La–O system. 相似文献