全文获取类型
收费全文 | 285篇 |
免费 | 3篇 |
专业分类
化学 | 165篇 |
晶体学 | 1篇 |
力学 | 6篇 |
数学 | 8篇 |
物理学 | 108篇 |
出版年
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2016年 | 9篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 7篇 |
2012年 | 5篇 |
2011年 | 16篇 |
2010年 | 16篇 |
2009年 | 8篇 |
2008年 | 14篇 |
2007年 | 14篇 |
2006年 | 9篇 |
2005年 | 7篇 |
2004年 | 8篇 |
2003年 | 7篇 |
2002年 | 12篇 |
2001年 | 10篇 |
2000年 | 12篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1990年 | 2篇 |
1989年 | 7篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1975年 | 5篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 6篇 |
1970年 | 3篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1961年 | 2篇 |
排序方式: 共有288条查询结果,搜索用时 31 毫秒
1.
V. T. Bublik S. Yu. Matsnev K. D. Shcherbachev M. V. Mezhennyi M. G. Mil’vidskii V. Ya. Reznik 《Physics of the Solid State》2003,45(10):1918-1925
Diffuse x-ray scattering (DXS) is used to study the formation of microdefects (MDs) in heat-treated dislocation-free large-diameter silicon wafers with vacancies. The DXS method is shown to be efficient for investigating MDs in silicon single crystals. Specific defects, such as impurity clouds, are found to form in the silicon wafers during low-temperature annealing at 450°C. These defects are oxygen-rich regions in the solid solution with diffuse coherent interfaces. In the following stages of decomposition of the supersaturated solid solution, oxide precipitates form inside these regions and the impurity clouds disappear. As a result of the decomposition of the supersaturated solid solution of oxygen, interstitial MDs form in the silicon wafers during multistep heat treatment. These MDs lie in the {110} planes and have nonspherical displacement fields. The volume density and size of MDs forming in the silicon wafers at various stages of the decomposition are determined. 相似文献
2.
I. P. Romanova S. G. Fattakhov A. A. Nafikova I. I. Vandyukova R. R. Shagidullin N. M. Azancheev V. S. Reznik O. G. Sinyáshin 《Russian Chemical Bulletin》1998,47(9):1812-1819
The reactions of phosphine derivatives of diallyl isocyanurates with palladium(ii) dichloride lead to the formation of complexes, whose structure, composition, and stability depend on the length of the methylene
chain between the isocyanurate and diphenylphosphine fragments in the ligand. 1,3-Diallyl-5-[5′-(diphenylphosphino)pentyl
and 10′-(diphenyl-phosphino)decyl] isocyanurates with PdCl2 form monomeric L2PdCl2
trans-complexes in which P atoms of the ligands participate in coordination with the metal. 1,3-Diallyl-5-[2′-(diphenylphosphino)ethyl]
isocyanurate with PdCl2 forms a dimeric (LPdCl2)2 complex, which decomposes in a solution to the monomer including solvent molecule into the coordination sphere of the metal.
The reactions of 1,3-diallyl-5-[4′-(diphenylphosphino)butyl] isocyanurate and 1,3-diallyl-5-[6′-(diphenylphosphino)hexyl]
isocyanurate with PdCl2 give monomeric chelate LPdCl2 complexes in which one of the allyl groups of the isocyanurate cycle participates in coordination with the central ion along
with the phosphorus atom.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1859–1865, September, 1998. 相似文献
3.
4.
Conclusions A study was made of the synthesis and some of the chemical transformations of 1-N-(-hydroxyethyl)-3,6-dimethyluracil.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 422–428, February, 1972. 相似文献
5.
6.
Information
Congresses, Conferences, Symposia, Meetings, and Seminars held in 1994 相似文献7.
Reznik B 《Physical review letters》1996,76(8):1192-1195
8.
C. Grogger S. G. Fattakhov V. V. Jouikov M. M. Shulaeva V. S. Reznik 《Russian Journal of General Chemistry》2005,75(3):386-393
Anodic oxidation of linear and bicyclic disulfides derived from isocyanuric acid was studied by cyclic voltammetry and numerical simulation. The PM3 molecular modeling revealed three types of the highest occupied molecular orbitals determining the electrochemical reactivity of these compounds: n electrons of the sulfur atoms of the disulfide bridge in linear and N-Me- and N-Ph-substituted bicyclic disulfides, π electrons of the aromatic fragment in the disulfide with the N-2-(2-methoxyphenoxy)ethyl isocyanurate substituent, and n electrons of the sulfide sulfur atoms in the compound with the -SS- and -S- fragments in the aliphatic chain. Oxidation of the disulfides with the SS-localized highest occupied molecular orbital follows the scheme with reversible electron transfer, followed by a fast potential-determining second-order reaction and a slow current-determining first-order reaction (ECC mechanism). The isocyanurate heterocycle does not participate directly in redox transformations but stabilizes the electrochemically generated radical cations by the mechanism of transannular interaction.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 3, 2005, pp. 422–429.Original Russian Text Copyright © 2005 by Grogger, Fattakhov, Jouikov, Shulaeva, Reznik. 相似文献
9.
Compounds consisting of two or three uracil fragments were synthesized by reaction of methyl-substituted uracil sodium salts with 1-(6-bromohexyl)-3,6-dimethyluracil or 1,6-dibromohexane. Treatment of these compounds with paraformaldehyde gave the corresponding pyrimidinophanes and acyclic compounds in which the uracil fragments are linked through methylene bridges. Uracil derivatives having no substituent on N3 were synthesized by reactions of silylated uracils with 1,3-bis(6-bromohexyl)uracil or 4,4′-(6-bromohexyloxy)diphenylmethane. The acyclic compound was converted into pyrimidinophane containing uracil fragments with N3H groups. A trinucleotide analog including uracil and two adenine fragments was synthesized from 1,3-bis(6-bromohexyl)uracil. 相似文献
10.
Talgat M. Inerbaev Vladimir R. Belosludov Rodion V. Belosludov Marcel Sluiter Yoshiyuki Kawazoe Jun-Ichi Kudoh 《Journal of inclusion phenomena and macrocyclic chemistry》2004,48(1-2):55-60
In this work, the electronic, structural, dynamic andthermodynamic properties of structure II, H and tetragonalAr clathrate hydrates have been calculated and the effectof multiple occupancy on their stability has been examinedusing first-principles and lattice dynamics calculations.The dynamic properties of these clathrates have beeninvestigated depending on the number of guest moleculesin a clathrate cage. It has been found that selectedhydrate structures are dynamically stable. The calculatedcell parameters are in agreement with experimental data.We also report the results of a systematic investigationof cage-like water structures using first-principles calculations. Ithas been observed that Ar clusters can be stabilized indifferent water cages and the stability is strongly dependenton the number of argon atoms inside the cages. 相似文献