全文获取类型
收费全文 | 185篇 |
免费 | 0篇 |
专业分类
化学 | 130篇 |
晶体学 | 5篇 |
力学 | 2篇 |
数学 | 18篇 |
物理学 | 30篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 8篇 |
2018年 | 15篇 |
2017年 | 16篇 |
2016年 | 12篇 |
2015年 | 2篇 |
2014年 | 11篇 |
2013年 | 10篇 |
2012年 | 8篇 |
2011年 | 11篇 |
2010年 | 8篇 |
2009年 | 7篇 |
2008年 | 5篇 |
2007年 | 10篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 5篇 |
2002年 | 8篇 |
2001年 | 2篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1977年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有185条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
Values of the modulus of elasticity, proportionality limit, and fracture strains and stresses have been measured at 4.2°K for polymers with different chemical structure and for a series of physically modified polymers. Relations have been established between the cryogenic values of the mechanical properties, the chemical structure of the macromolecules, and the conditions of formation of the physical structure of the polymer. 相似文献
25.
M. F. Shostakovskii T. A. Favorskaya A. S. Medvedeva M. M. Demina L. P. Safronova 《Russian Chemical Bulletin》1968,17(9):2019-2021
Conclusions We obtained and characterized six diacetylene primary and secondary-tertiary glycols.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2129–2130, September, 1968. 相似文献
26.
Nikita A. Kazin Nadezhda S. Demina Roman A. Irgashev Ekaterina F. Zhilina Gennady L. Rusinov 《Tetrahedron》2019,75(33):4686-4696
The effective approaches for regioselective double formylation and acetylation of 5,12-dialkyl-6,7-diaryl-substituted 5,12-dihydroindolo[3,2-a]carbazoles by their treatment with dichloromethyl methyl ether in the presence of SnCl4 or with acetyl chloride in the presence of AlCl3 to afford the 2,9-diformyl or 2,9-diacetyl derivatives, respectively, were developed. Furthermore, new 2,9-bis(2,2-dicyanovinyl) derivatives were synthesized by the Knoevenagel condensation of diformyl-containing substrates with malononitrile, when new 2,9-bis(quinoxaline-2-yl)- and 2,9-bis(benzo[g]quinoxaline-2-yl) derivatives were formed via microwave-promoted oxidation of diacetyl-containing substrates with SeO2 to the corresponding diglyoxals, followed by the reaction of these intermediates with o-phenylendiamine or 2,3-diaminonaphthalene, respectively. The basic optical and electrochemical properties of some 5,12-dihydroindolo[3,2-a]carbazoles were investigated. 相似文献
27.
Physics of Atomic Nuclei - The precision of approximate Kramers formulas for the nuclear-fission rate in the presence of shell corrections in a quasistationary state is studied. The rates in... 相似文献
28.
E. A. Kirzhanova M. A. Pechenkin N. B. Demina N. G. Balabushevich 《Moscow University Chemistry Bulletin》2016,71(2):127-133
The properties of protein-containing micro- and nanoparticles that were produced from alginate and chitosan using the methods of layer-by-layer polyelectrolyte adsorption and ionotropic gelation have been compared. The encapsulation efficiency of proteins (aprotinin, interferon, and human insulin), the size and ζ-potential of the particles, the mucin binding, and the protein release under physiological conditions have been studied. The prospects for the possible mucosal application of the particles are discussed. 相似文献
29.
O. A. Demina S. A. Shkirskaya N. A. Kononenko E. V. Nazyrova 《Russian Journal of Electrochemistry》2016,52(4):291-298
The possibility of assessing the selectivity of composite perfluorated membranes MF-4SK modified with polyaniline (PANI), based on the concentration dependence of their specific conductivity in terms of the extended three-wire model of conduction of ion-exchange materials is investigated. To check the reliability of results obtained, the transport numbers of ions are calculated based on the electrodiffusion coefficients of counter ions and coions determined from concentration dependences of conductivity and diffusion permeability of ion-exchange membranes. The transport numbers of hydrogen ions found by these two methods are shown to coincide with high accuracy throughout the whole range of concentrations of HCl solutions for the original MF-4SK membrane and membranes with the fixed thickness of the modified polyaniline layer on their one side. For the MF-4SK sample the with gradient distribution of polyaniline, which exhibits asymmetrical transport characteristics, the deviation between the transport numbers of ions calculated with the use of electrodiffusion coefficients of counter ions and coions and those determined in terms of the extended three-wire model of conduction is shown to increase with the increase in solution concentration but not exceed 4%. 相似文献
30.
A. V. Ankudinov A. V. Voronin V. K. Gusev Ya. A. Gerasimenko E. V. Demina M. D. Prusakova Yu. V. Sud’enkov 《Technical Physics》2014,59(3):346-352
The influence of a plasma producing nonstationary thermal loads akin to edge-localized modes in a tokamak on different types of tungsten is investigated. Tungsten is irradiated by a jet of a hydrogen plasma generated in a plasma gun. The plasma density and velocity are on the order of 1022 m?3 and 100–200 km/s, respectively, and the irradiation time is 10 μs. Two plasma flux densities, 0.70 and 0.25 MJ/m2, are used. Structural modifications in irradiated single-crystal and hot-rolled tungsten samples, as well as in V-MP and ITER_D_2EDZJ4 tungsten powders, are examined. It is found that the plasma generates a regular crack network with a period of about 1 mm on the surface of the single-crystal, hot-rolled, and V-MP powder samples, while the surface of the ITER_D_2EDZJ4 powder is more cracking-resistant. The depth of the molten layer equals 1–3 μm, and the extension of intense thermal action is 15–20 μm. The material acquires a distinct regular structure with a typical grain size of less than 1 μm. X-ray diffraction analysis shows that irradiation changes the crystal lattice parameters because of the melting and crystallization of the surface layer. The examination of the V_MP tungsten powder after cyclic irradiation by a plasma with different energy densities shows that high-energy-density irradiation causes the most significant surface damage, whereas low-energy-density irradiation generates defects that are small in size even if the number of cycles is large. 相似文献