全文获取类型
收费全文 | 125篇 |
免费 | 0篇 |
专业分类
化学 | 76篇 |
力学 | 7篇 |
数学 | 3篇 |
物理学 | 39篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 5篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 7篇 |
2012年 | 8篇 |
2011年 | 17篇 |
2010年 | 12篇 |
2009年 | 6篇 |
2008年 | 8篇 |
2007年 | 4篇 |
2006年 | 5篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1980年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1971年 | 2篇 |
1970年 | 3篇 |
1967年 | 1篇 |
排序方式: 共有125条查询结果,搜索用时 31 毫秒
1.
2.
A. F. Abdullin A. V. Pyataev N. E. Domracheva M. S. Gruzdev 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2016,10(1):35-38
The properties of the surface layer of core-shell nanoparticles incorporated into the matrix of macromolecules of 3,4-bis(decyloxybenzoyl) poly(propylene imine) derivative of the second generation are studied by Mössbauer spectroscopy at low temperatures. The spin states, the details of the phonon spectrum and the Debye temperature of surface layer atoms discussed. 相似文献
3.
T. P. Kustova A. A. Kruglyakova M. S. Gruzdev L. B. Kochetova 《Russian Journal of Applied Chemistry》2016,89(4):609-617
The kinetic relationships of arenesulfonation of benzoic and benzenesulfonic acid hydrazides were studied. Based on the data obtained, the conditions for synthesizing these products were optimized. The synthesis can be performed using aqueous-organic solvents containing 2-propanol, 1,4-dioxane, or tetrahydrofuran as nonaqueous component. The thermal stability of benzenesulfohydrazide and its sulfonation product was compared on the basis of data of gas chromatography–mass spectrometry. The fragmentation pathways of the reactants and target product, sulfonated benzenesulfohydrazide, were suggested. 相似文献
4.
Krasnov Victor P. Zarubaev Vladimir V. Gruzdev Dmitry А. Vozdvizhenskaya Olga А. Vakarov Sergey А. Musiyak Vera V. Chulakov Evgeny N. Volobueva Alexandrina S. Sinegubova Ekaterina O. Ezhikova Marina А. Kodess Mikhail I. Levit Galina L. Charushin Valery N. 《Chemistry of Heterocyclic Compounds》2021,57(4):498-504
Chemistry of Heterocyclic Compounds - A number of novel amides were synthesized by coupling of 6-[(9H-purin-6-yl)amino]hexanoic acid to heterocyclic amines. The antiviral activity of the obtained... 相似文献
5.
D. F. Pyreu E. V. Kozlovskii M. S. Gruzdev 《Russian Journal of Coordination Chemistry》2010,36(4):293-297
The formation of the heteroleptic complexes FeEdtaIda3− and FeEdtaEn−(Ida2− is the iminodiacetate anion and En is ethylenediamine) was examined by direct calorimetry, pH potentiometry, and spectrophotometry
at 298.15 K and the ionic strength I = 0.5 (KNO3). A possible way of coordination of the ligands in the heteroleptic complexes was discussed. 相似文献
6.
Dmitry A. Gruzdev Galina L. Levit Victor P. Krasnov Evgeny N. Chulakov Liliya Sh. Sadretdinova Aleksandr N. Grishakov Marina A. Ezhikova Mikhail I. Kodess Valery N. Charushin 《Tetrahedron: Asymmetry》2010,21(8):936-942
A comparative study of the kinetic resolution of racemic 2-methyl-1,2,3,4-tetrahydroquinoline and 2,3-dihydro-3-methyl-4H-1,4-benzoxazine using N-phthaloyl-(S)-amino acyl chlorides as chiral acylating agents is described. Temperature and solvent effects on the stereochemical features have been examined. It has been found that N-phthaloyl-(S)-phenylalanyl and N-phthaloyl-(S)-2-phenylglycyl chlorides bearing aromatic substituents close to the stereogenic centre are more stereoselective acylating agents than N-phthaloyl-(S)-alanyl chloride. For the preparative kinetic resolution of racemic amines N-phthaloyl-(S)-phenylalanyl chloride proved to be the most appropriate chiral acylating agent. 相似文献
7.
Based on a generalization of the method of Sturmian expansions to the case of many-electron systems, a fundamentally new approach was developed for the construction of a complete set of intermediate states in many-body perturbation theory thereby avoiding integration over states of the continuous spectrum. A complete system of eigenfunctions of the generalized eigenvalue problem for the one-electron Hartree-Fock equation with a factor before the energy operator and fixed values of the Lagrange multipliers is used as a basis of single-particle virtual orbitals for an initial approximation to the eigenfunctions of the Hartree-Fock self-consistent field method. In the case of bound states, the spectrum of the effective operator is purely discrete, thus permitting one to completely eliminate integration over continuum virtual orbitals in applying methods of many-body perturbation theory to atomic and molecular calculations for a number of cases. As a consequence, one manages to avoid a number of the technical difficulties associated with inclusion of such states. The possibilities of the developed approach are illustrated in application to the investigation of the interaction of many-electron atoms with external fields.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 73–85, August, 1990. 相似文献
8.
Russian Physics Journal - The physical concept and the model of the construction of the plasma source of charged particles in crossed E × H fields are presented in which, due to the special... 相似文献
9.
Alkylbenzenes were subjected to bromination with molecular bromine using 1-butyl-3-methylimidazolium bromide as solvent. A
complex of 1-butyl-3-methylimidazolium bromide with bromine was synthesized. It ensured bromination of alkylbenzenes with
no bromine and solvent. The results of bromination in binary solvents and ionic liquids, 1-butyl-3-methylimidazolium bromide
and tribromide were compared. The bromination of ethylbenzene with 1-butyl-3-methylimidazolium tribromide was accompanied
by formation of a considerable amount of α-bromoethylbenzene, which is not typical of electrophilic aromatic substitution
process. 相似文献
10.
O. B. Akopova E. V. Kurbatova M. S. Gruzdev 《Russian Journal of General Chemistry》2010,80(2):268-274
The forecasting of columnar and chiral mesomorphism was done for the new series of triphenylene derivatives. The mesomorphic
properties of the two heptasubstituted triphenylenes containing chiral fragments were studied. The prediction results agreed
well with the experimental data. Anilides of 1-amino-2,3,6,7,10,11-hexa(heptyloxy)triphenylene with abietic and dihydrocholic
acids were found to exhibit the enantiotropic columnar dimesomorphism and to display the chiral columnar mesophases in the
low-temperature range. The anilides obtained possess a lower thermal stability and extended interval of the mesophase existence
than the initial amine. 相似文献