全文获取类型
收费全文 | 140篇 |
免费 | 0篇 |
专业分类
化学 | 33篇 |
晶体学 | 5篇 |
力学 | 7篇 |
数学 | 28篇 |
物理学 | 67篇 |
出版年
2022年 | 3篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 4篇 |
2011年 | 7篇 |
2010年 | 4篇 |
2009年 | 8篇 |
2008年 | 8篇 |
2007年 | 1篇 |
2006年 | 2篇 |
2005年 | 4篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 10篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有140条查询结果,搜索用时 15 毫秒
71.
T. S. Karpova V. G. Vasilyev E. V. Vladimirova A. P. Nosov 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(8):1036-1038
The correlation between methods of synthesis and magnetostrictive properties of ferrite materials is investigated. CoFe2O4 spinel ferrite was synthesized using three techniques: solid-phase reactions, thermal hydrolysis, and sol-gel. The effect
of the method of synthesis on the magnetostrictive properties of spinel ferrite is demonstrated. 相似文献
72.
73.
74.
The survey is devoted to certain current problems in general combinatorial mathematics. The contemporary state-of-the-art of the theory of permanents, questions on the existence and the enumeration of matrices with nonnegative elements, and a number of problems connected with latin rectangles (enumeration, problem of completing a latin square, equidistant arrays) are examined. The main directions in combinatorial theory in connection with selection problems also are analyzed: matroid theory, transversals, extremal problems (coverings, depth of a matrix, Sperner families). Principal attention is paid to the papers reviewed in Referativnyi Zhurnal “Matematika” during 1975–1979. 相似文献
75.
E. B. Trostyanskaya A. M. Poimanov E. F. Nosov A. R. Bel'nik 《Mechanics of Composite Materials》1969,5(6):905-909
The elastic (modulus of elasticity and equilibrium high-elastic modulus) and thermal (volume coefficients of thermal expansion below and above the glass transition temperature) properties of compositions based on ÉD-5 epoxy resin cured with polyethylenepolyamine have been investigated. Quartz powder and aluminoborosilicate glass powder were employed as fillers at concentrations from 0 to 0.413. The thermal expansion coefficients of the compositions were studied in a dilatometer, in which the specimen is free of mechanical loads. The Young's modulus at 25°C and the equilibrium high-elastic modulus at 125°C of the compositions were determined in the compression regime in an instrument based on the IZV-2 optical length gage. The thermal expansion coefficients of the polymer matrix were calculated with allowance for the elastic properties of the resin and the filler. It is shown that, as the filler concentration increases, the thermal and elastic properties of the resin in the filled system change. This can be interpreted as a change in the properties of the resin as it approaches the surface of the filler particles. Increased interaction between the filler surface and the epoxy resin tends to stiffen the polymer network.Scientific Research Institute of Precision Technology, Moscow. Translated from Mekhanika Polimerov, No. 6, pp. 1018–1022, November–December, 1969. 相似文献
76.
We consider output feedback stabilization for an uncertain controlled system of a high relative order. The proposed approach reduces the relative order of the system by structural dynamic adjustment of the controlled plant. Sufficient adjustment conditions are stated in the form of a functional relationship and a control algorithm ensuring these conditions in a feedback system is proposed. 相似文献
77.
A. M. Poimanov E. B. Trostyanskaya E. F. Nosov A. R. Bel'nik 《Mechanics of Composite Materials》1970,6(1):46-49
It is shown for the first time that the increased strength of filled plastics is associated with an increase of the internal pressure in the resin determined by the nature of the filler surface and the curing conditions.For communication 1, see [1].Moscow. Translated from Mekhanika Polimerov, No. 1, pp. 54–58, January–February, 1970. 相似文献
78.
79.
Bubnov G. M. Grigor’ev V. F. Zinchenko I. I. Zemlyanukha P. M. Il’in G. N. Kabanov D. M. Nosov V. I. Vdovin V. F. 《Radiophysics and Quantum Electronics》2020,62(12):820-829
Radiophysics and Quantum Electronics - This paper proposes, and practically implements, a technique for finding equivalent frequencies, which are attributed to the atmospheric optical depths... 相似文献
80.
Bruna F. Soares Daniil R. Nosov Jos M. Pires Andrey A. Tyutyunov Elena I. Lozinskaya Dmitrii Y. Antonov Alexander S. Shaplov Isabel M. Marrucho 《Molecules (Basel, Switzerland)》2022,27(2)
This work aims to explore the gas permeation performance of two newly-designed ionic liquids, [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2], in supported ionic liquid membranes (SILM) configuration, as another effort to provide an overall insight on the gas permeation performance of functionalized-ionic liquids with the [C2mim]+ cation. [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2] single gas separation performance towards CO2, N2, and CH4 at T = 293 K and T = 308 K were measured using the time-lag method. Assessing the CO2 permeation results, [C2mim][CF3BF3] showed an undermined value of 710 Barrer at 293.15 K and 1 bar of feed pressure when compared to [C2mim][BF4], whereas for the [C2mim][CF3SO2C(CN)2] IL an unexpected CO2 permeability of 1095 Barrer was attained at the same experimental conditions, overcoming the results for the remaining ILs used for comparison. The prepared membranes exhibited diverse permselectivities, varying from 16.9 to 22.2 for CO2/CH4 and 37.0 to 44.4 for CO2/N2 gas pairs. The thermophysical properties of the [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2] ILs were also determined in the range of T = 293.15 K up to T = 353.15 K at atmospheric pressure and compared with those for other ILs with the same cation and anion’s with similar chemical moieties. 相似文献