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51.
G. Yu. Ishmuratov V. A. Vydrina M. P. Yakovleva E. F. Valeeva R. R. Muslukhov G. A. Tolstikov 《Russian Journal of Organic Chemistry》2011,47(8):1142-1145
Methylidenetriphenylphosphorane in reactions with seven-membered lactols and their aluminates can act as a reducer converting
them into the corresponding diols. 相似文献
52.
53.
L. Ya. Zakharova F. G. Valeeva A. R. Ibragimova A. V. Zakharov S. N. Shtykov I. V. Bogomolova A. I. Konovalov 《Kinetics and Catalysis》2012,53(3):344-352
The micellization and surface properties, Stern layer micropolarity, and catalytic action of the cetyltrimethylammonium bromide-Brij-35 system in the alkaline hydrolysis of O-ethyl O-p-nitrophenyl chloromethylphosphonate have been investigated at different proportions of the constituent surfactants. This system has unique, invertible catalytic properties ranging from acceleration of the hydrolysis reaction by more than one order of magnitude to strong inhibition of this reaction and even termination of the reaction at certain proportions of the surfactants. The factors in the changes of the catalytic effect under variation of the surfactant ratio are micropolarity in the reaction zone and surface potential. A likely cause of the termination of the process is the shift of the reaction zone from the surface layer to the micelle core, where the environment is less polar. 相似文献
54.
Yu. R. Kudryashova F. G. Valeeva L. Ya. Zakharova S. E. Solovieva I. S. Antipin A. T. Gubaidullin A. I. Konovalov 《Colloid Journal》2012,74(1):67-77
The aggregation of amphiphilic oxyethylated calix[4]arene is studied in the absence and presence of polyethyleneimine. At
low calixarene concentrations, large ensembles with a hydrodynamic diameter of about 100 nm are formed and coexist with small
(smaller than 10 nm) aggregates, which are observed in the entire concentration range. It is established that calixarene-based
systems catalyze the neutral hydrolysis of bis(chloromethyl)phosphinic acid p-nitrophenyl ester, with the catalytic effect
being as high as two orders of magnitude in the presence of La(III) ions. The rate of hydrolysis of phosphonates depends on
the composition of the supramolecular system. The maximum acceleration exceeds three orders of magnitude in comparison with
alkaline hydrolysis of the substrates. 相似文献
55.
D. A. Davydov S. Z. Nazarova A. A. Valeeva A. A. Rempel 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(8):1090-1093
The concentration dependences of the magnetic susceptibility and lattice parameter of cubic vanadium monoxide have been measured in the composition range from VO0.81 to VO1.07. Near the stoichiometric composition VO1.00, the concentration dependences exhibit a stepwise increase in the specific magnetic susceptibility (by approximately 0.7 × 10?6 cm3/g) and lattice constant (by about 0.002 nm). These effects can be related to the concentration phase transition, which occurs in vanadium monoxide with a change from a substoichiometric composition to superstoichiometric. At such a transition, along with a decrease in the concentration of oxygen vacancies, tetrahedrally coordinated vanadium interstitials are formed, as a result of which the B1 structure changes to a more complex cubic phase structure with the same space group Fm-3m. 相似文献
56.
V. E. Bel'skii F. G. Valeeva L. A. Kudryavtseva B. E. Ivanov 《Russian Chemical Bulletin》1991,40(9):1738-1741
The reaction of p-nitrophenyldiethylphosphate with sodium phenolate takes place readily in aprotic polar solvents. Bimolecular rate constants of this reaction increase with increased concentration of the phenolate in such solvents as dimethylsulfoxide (DMSO), dimethylformamide (DMF), or hexamethylphosphoric amide (HMPA), but decrease in acetonitrile or acetone; this is caused by the association of sodium phenolate, and the different reactivities of free ions and ion pairs. The addition of 18-crown-6 to the reaction mixture decreases the reaction rate, because of the reduced reactivity of the complex formed by the crown ether with the phenolate ion pair.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1968–1972, September, 1991. 相似文献
57.
The conductivity and magnetic susceptibility of disordered titanium monoxide TiOy (0.920≤y≤1.262) containing vacancies in titanium and oxygen sublattices are investigated. For TiOy monoxides with an oxygen content y≤1.069, the temperature dependences of the conductivity are described by the Bloch-Grüneisen function at a Debye temperature ranging from 400 to 480 K and the temperature dependences of the magnetic susceptibility are characterized by the contribution from the Pauli paramagnetism due to conduction electrons. The behavior of the conductivity and magnetic susceptibility of TiOy monoxides with an oxygen content y≥1.087 is characteristic of narrow-gap semiconductors with nondegenerate charge carriers governed by the Boltzmann statistics. The band gap ΔE between the valence and conduction bands of TiOy monoxides with y≥1.087 falls in the range 0.06–0.17 eV. 相似文献
58.
59.
Arkhipova D. M. Ermolaev V. V. Miluykov V. A. Gaynanova G. A. Valeeva F. G. Zakharova L. Ya. Konovalov A. I. Islamov D. R. Kataeva O. N. Sinyashin O. G. 《Russian Chemical Bulletin》2015,64(10):2486-2492
Russian Chemical Bulletin - A crystal structure and aggregation properties of tri-n-butyl(octadecyl)phosphonium tetrafluoroborate were studied. Palladium nanoparticles stabilized by this... 相似文献
60.
The disordered and ordered structures of nonstoichiometric titanium monoxide TixOz≡TiOy(y=z/x) containing structural vacancies simultaneously in the nonmetallic and metallic sublattices were studied. In the stoichiometry range from TiO0.9 to TiO1.1, an ordered monoclinic phase [space group C2/m (A12m/1)] of the Ti5O5 type is formed in the TiOy monoxide at temperatures below 1300 K. The disorder-order TiOy?Ti5O5 phase-transition channel involves Lifshitz {k10} and non-Lifshitz {k4} and {k11} star rays. The ordering proceeds as a first-order phase transition with a decrease in the volume of the basal cubic lattice. The titanium and oxygen distribution functions in the metallic and nonmetallic sublattices of titanium monoxide are calculated. The domain of allowed values is determined for the long-range order parameter. 相似文献