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91.
92.
Ivanov D. M. Kuklin S. A. Polezhaev A. V. Petrovskii P. V. Smol’yakov A. F. Dolgushin F. M. Ezernitskaya M. G. Peregudov A. S. Koridze A. A. 《Russian Chemical Bulletin》2009,58(8):1701-1706
Resorcinol-based ruthenium bis(phosphinite) complexes were synthesized. Complexes RuCl(CO)[2,6-(But
2PO)2C6H3] (9) and RuH(CO)[2,6-(But
2PO)2C6H3] (10) were obtained by cyclometallation of 1,3-(But
2PO)2C6H3 with RuCl2(DMSO)4 in 2-methoxyethanol in the presence of Hünig’s base. The interconversion of complexes 9 and 10 was studied. The addition of carbon monoxide to complexes 9 and 10 yielded 18e adducts, RuCl(CO)2[2,6-(But
2PO)2C6H3] (11) and RuH(CO)2[2,6-(But
2PO)2C6H3] (12), respectively. In the case of complex 9, this reaction is reversible. Reaction of complex 10 with trifluoroacetic acid resulted in complex Ru(CF3COO)(CO)[2,6-(But
2PO)2C6H3] (13), which reacted with carbon monoxide to give complex Ru(CF3COO)(CO)2[2,6-(But
2PO)2C6H3] (14). Based on the IR spectral data, the TFA ligand in complexes 13 and 14 is bound in a bi- and monodentate fashion, respectively. The structure of compound 9 was determined by X-ray diffraction analysis. 相似文献
93.
Kuklin V. N. Mikhailov L. E. Mironova G. A. Ivin B. A. 《Russian Journal of General Chemistry》2009,79(10):2212-2219
Reactions of 2-aryl-4-chloro-6H-1,3-thiazin-6-ones with sodium sulfide in aqueous alcohol at 18–20°C led to the formation of a readily separable mixture
of 2-aryl-4-sulfanyl-6H-1,3-thiazin-6-one sodium salts (yield >70%) and bis(2-aryl-6-oxo-6H-1,3-thiazin-4-yl) sulfides (<10%). The latter can also be obtained in more than 50% yield by treatment of 2-aryl-4-sulfanyl-6H-1,3-thiazin-6-one sodium salts with 2-aryl-4-chloro-6H-1,3-thiazin-6-ones. Methylation of 2-aryl-4-sulfanyl-6H-1,3-thiazin-6-ones afforded the corresponding methylsulfanyl derivatives (yield >90%) regardless of the alkylating agent,
solvent, temperature, reactant concentration, and their ratio. 2-Aryl-4-sulfanyl-6H-1,3-thiazin-6-ones in the crystalline state and in solutions in polar and nonpolar protic and aprotic solvents exist preferentially
as 4-sulfanyl-6-oxo tautomers, and they undergo almost complete ionization in neutral aqueous, alcoholic, and aqueous-alcoholic
media (pK
a = 4.3). Reactions of 4-sulfanyl-2-phenyl-6H-1,3-thiazin-6-one with ammonia, amines, and difunctional N-centered nucleophiles involve cleavage of the C6-S bond in the thiazine ring and subsequent recyclization of linear intermediates to pyrimidines and diazole derivatives.
The structure of the isolated compounds was confiirmed by 1H and 13C NMR, IR, and UV spectra. 相似文献
94.
Valentin Borshchevskiy Ekaterina Moiseeva Alexander Kuklin Georg Büldt Masakatsu Hato Valentin Gordeliy 《Journal of Crystal Growth》2010,312(22):3326-3330
Here we report a successful use of a recently developed isoprenoid-chained lipid family for in meso crystallization of membrane proteins. The isoprenoid-chained lipid 1-O-(3,7,11,15-tetramethylhexadecyl)-β–d-xyloside (β-XylOC16+4) used as a host lipid for in meso crystallization provided high quality bacteriorhodopsin (bR) crystals (P63 space group) diffracting to high resolution and characterized by low twinning ratio. β-XylOC16+4 has an isoprenoid chain with methyl branches at each 4th position and a xylose group in the water-soluble part. These peculiarities make the lipid clearly distinguishable in the bR crystalline lattice and provides a unique opportunity to study the role of the host lipid in the in meso crystallization. We conclude that β-XylOC16+4 may have a general application for in meso crystallization for a wide range of membrane proteins. The cubic phase of β-XylOC16+4 is present over a wide range of temperatures and is stable at low temperature (down to about 8 °C). This opens up the possibility of using temperature as a tool for the optimization of in meso crystallization with additional advantages for the crystallization of membrane proteins at lower temperatures where the proteins of interest may be more stable. 相似文献
95.
S. N. Kuklin T. M. Shneidman G. G. Adamian N. V. Antonenko 《The European Physical Journal A - Hadrons and Nuclei》2012,48(8):1-11
A model of the cluster radioactivity of even-even nuclei is presented. In this model, the zero-point vibrations in the charge-asymmetry coordinate determine the cluster formation (spectroscopic factor), while the tunneling in the coordinate of the relative separation of the centers of mass of the cluster and the daughter nucleus determines the penetrability of the barrier of the nucleus-nucleus potential. The quality of the model is demonstrated for describing cluster decay half-lives and the fine structure in alpha decays of even-even U isotopes. The model is applied to describe the alpha decays in the isotopic chains of Po, Rn, and U. The correspondence of the calculated half-lives to the Geiger-Nuttall law is discussed. 相似文献
96.
97.
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99.
E. M. Kosacheva D. B. Kudryavtsev R. F. Bakeeva A. I. Kuklin A. Kh. Islamov L. A. Kudryavtseva V. F. Sopin A. I. Konovalov 《Colloid Journal》2006,68(6):713-720
The aggregation of binary mixtures of branched polyethylenimine with a molecular mass of 30 000 and cationic surfactants, such as cetyltrimethylammonium bromide, cetyldimethylethylammonium bromide, or cetyldimethyl(2-hydroxyethyl)ammonium bromide, in aqueous solutions is studied. The critical micellization concentrations, as well as the sizes and shapes of aggregates, are determined by conductometry, small-angle neutron scattering, and dynamic light scattering methods. Catalytic activity of cationic surfactant-polyethylenimine compositions in the hydrolysis of tetracoordinated phosphorus acid 4-nitrophenyl esters is studied via spectrophotometry. The influence of spatial characteristics of aggregates on the catalytic activity and selectivity of nanostructured polymeric systems is revealed. 相似文献
100.
R. N. Kuklin 《Russian Journal of Electrochemistry》2006,42(12):1304-1309
Properties of the interface between a mercury electrode and an electrolytic solution containing surface-active substances are explored. A generalized formulation of conditions for thermodynamic equilibrium during electroadsorption (equation of state) is given with use made of the principle of a minimum free energy of the interface at a zero entropy production (de Donder-Prigogine-Defay). The states on which the second differential of the surface tension is degenerate belong to the stability threshold (lines of inflection points). 相似文献