全文获取类型
收费全文 | 381篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
化学 | 187篇 |
晶体学 | 1篇 |
力学 | 1篇 |
数学 | 10篇 |
物理学 | 185篇 |
出版年
2021年 | 2篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 10篇 |
2014年 | 8篇 |
2013年 | 11篇 |
2012年 | 15篇 |
2011年 | 10篇 |
2010年 | 18篇 |
2009年 | 10篇 |
2008年 | 8篇 |
2007年 | 12篇 |
2006年 | 13篇 |
2005年 | 7篇 |
2004年 | 13篇 |
2003年 | 12篇 |
2002年 | 5篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 10篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1981年 | 18篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1974年 | 13篇 |
1973年 | 13篇 |
1972年 | 10篇 |
1971年 | 7篇 |
1969年 | 2篇 |
1968年 | 5篇 |
1967年 | 2篇 |
1965年 | 2篇 |
1961年 | 1篇 |
排序方式: 共有384条查询结果,搜索用时 15 毫秒
161.
Dmitry B. Vinogradov Pavel V. Bulatov Evgeny Yu. Petrov Pavel S. Gribov Natalia N. Kondakova Natalia N. Ilicheva Evgenia R. Stepanova Anatoly P. Denisyuk Vladimir A. Sizov Valery P. Sinditskii Aleksei B. Sheremetev 《Molecules (Basel, Switzerland)》2022,27(22)
A simple, mild and general method has been developed for the preparation of alkyl nitramines bearing a halogenoalkoxylic moiety. From these reactive halogen intermediates, a few azidoalkoxyl alkyl nitramines have been produced as energetic plasticizers. This simple protocol allows azidonitramino ether plasticizers to be obtained from available precursors in high yields, as it is safe and viable for large-scale operations. The resulting products have been fully characterized by spectral methods, and their impact sensitivity, thermal transformations and burning properties were determined, thus allowing complete comparison to the analogues including other combinations of structural units. Such characterization of these new plasticizers illustrates the extent to which the nature and position of the functional units can be used to tune the above properties of these nitramines. All azidonitramino ethers are liquid with excellent energetic performance and are promising candidates for new environmentally friendly energetic materials. 相似文献
162.
163.
L. A. Gribov 《Doklady Physics》2016,61(12):583-585
A method of calculation of electron states in large molecules is proposed on the basis of the linear combinations of one-center functions of fragments with their interactions subsequently taken into account. It is shown that the computing procedure can be implemented similarly to the conventional one using LCAO. 相似文献
164.
165.
A system of algorithms and programs permitting mathematical synthesis and comprehensive analysis of a complete set of isomeric structural formulae which satisfy a given empirical formula is described. The system offers the possibility of structure- generation control which enables structures belonging to specified classes of compounds to be generated and their topological characteristics to be investigated. For example, all cyclic compounds can be detected and their structural details (such as dimensions, the number of bonds of various multiplicity, the sequence of vertices, etc.) determined. Examples are given illustrating the applicability of the system. The possibility of using this system in prognosticating structures with specified properties is shown. 相似文献
166.
167.
The singlet structure function of a deep inelastic process, D(x, q2, is studied in the double log approximation of perturbative QCD at small x and large q2. It is shown, how the increase of D at small x is screened by multiladder diagrams, so that the unitarity is not violated. The equation that sums such diagrams is written and solved, the screening effects being reduced to a specific boundary condition for the ladder equation. 相似文献
168.
169.
D. D. Mozzhukhin B. G. Gribov G. A. Tychin A. S. Strizhkova M. L. Khidekel' 《Russian Chemical Bulletin》1967,16(1):163-165
Conclusion Dibenzenechromium and its homologs can be used as catalyst/transfer agents in, for example, the reactions of formamidinesulfinic acid and sodium hydrosulfite with molecular oxygen and alkyl halides.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 175–177, January, 1967. 相似文献
170.
Based on the method developed earlier to calculate the dynamic electronic-vibrational spectra of complex molecules with allowance for isomeric transformations, a more general method has been developed making it possible to model the spectra of several isomeric forms in any number depending on the problem posed. Population dynamics analysis of the energy levels of isomers is possible. Computational algorithms have been developed and optimized, and a specialized software has been developed for a PC and a supercomputer (of the type MVS 1000). Computer experiments were carried out, and the possibility of simulating dynamic spectra and kinetic intramolecular processes in real time for complex compounds with allowance for their intermolecular transformations is shown. 相似文献