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101.
V. I. Ivanenko E. P. Lokshin R. I. Korneikov S. V. Aksenova V. T. Kalinnikov 《Russian Journal of Applied Chemistry》2008,81(5):760-764
Effect of the degree of hydration and the phosphorus to titanium ratio in sorbents based on hydrated oxotitanium hydrophosphate on their sorption properties: constant of heterogeneous substitution of hydrogen ions by cations of sodium, cesium, and strontium and static exchange capacity, was studied. 相似文献
102.
E. I. Aksenova 《Computational Mathematics and Mathematical Physics》2006,46(3):425-436
An efficient three-level scheme for parabolic equations in cylindrical coordinates is constructed in a region with a small hole. No axial symmetry is assumed. The convergence rate of the scheme is estimated under minimum requirements on the initial data. The estimates are uniform with respect to a small parameter—the inner diameter of the region. The order of convergence is τ + h 2, τ1/2 + h, τ + h, depending on the smoothness of the data. 相似文献
103.
104.
Yu. M. Baikova M. E. Kompan E. I. Nikulin Yu. P. Stepanov I. I. Novak T. I. Aksenova I. V. Khromushin K. D. Bukenov A. K. Berdauletov Z. V. Medvedeva B. Z. Volchek N. F. Uvarov V. P. Gorelov 《Ionics》2003,9(5-6):395-403
Phenomena and processes either new or not studied in-depth occurring in perovskite oxides and in systems which contain these
compounds are reported and summarized. The materials under consideration are well-known for specific properties, e.g., cerates
of alkaline earths are high-temperature proton conductors, manganates are electrode materials of SOFCs and show the effect
of colossal magnetoresistance or YBa2Cu3O7 cuprates YBa2Cu3O7 are “high-temperature” superconductors. The presented nontraditional approach consists of considering physical and chemical
phenomena and processes, which do not relate to the indicated main properties of the compounds. For instance, BaCeO3 undoped and slightly doped has partially cerium in the form of Ce+3, which provides the effect of blue luminescence which is controlled by thermochemical treatment; H2YBa2Cu3O7 manifests mixed proton-electron conduction at 400–550 K under water vapor of 100–300 Pa; La0.67Ca0,33MnO2.84 can dissolve some part of water vapor as this occurs in traditional HTPC. The electrochemical cells Pd | HTPC | hydrocuprate
| HTPC | Pd and the more simple one Pd | HTPC | Pd show e.m.f. values near 1 V under certain conditions after polarization
by d.c. currents at 420–520 K under different atmospheres. The system water vapor — membrane of undoped BaCeO3-hydride is described. Defect chemistry equations are used to describe some of the phenomena which are employed for the production
and storage of pure hydrogen. 相似文献
105.
V. V. Aksenova R. M. Nikonova V. I. Lad’yanov V. V. Mukhgalin I. V. Sterkhova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(6):1002-1008
The C60-toluene and C70-toluene complexes were studied by IR-Fourier spectroscopy. The complexes were obtained by crystallization from a toluene solution at room temperature. The changes in the IR spectra caused by the deformation of toluene molecules in the complexes allowed us to study the phase transitions in the fullerene-aromatic solvent systems. 相似文献
106.
The propagation of light in helical media whose pitch greatly exceeds the radiation wavelength has been investigated. It is shown that such a system includes forbidden zones corresponding to the effect of ray turning. The propagation of an extraordinary ray corresponding to a very narrow forbidden zone has been analyzed in detail. The radiation wave field has been obtained both far from a turning point and in the close vicinity of such a point. It is shown that, in the vicinity of a turning point, mode transformation takes place and the wave acquires an elliptical polarization. The parameters of the ellipticity and the relations between the amplitudes of the waves passed through the forbidden zone and “reflected” from it are calculated. 相似文献
107.
108.
Glagolev N. N. Rogovina S. Z. Soloveva A. B. Aksenova N. A. Kotova S. L. 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(1):S72-S76
It was demonstrated that the activity of tetrapyrrole photosensitizers (TPSs) of singlet oxygen generation (dimegin, tetrasulfophenylporphyrin, and photoditasine) in the oxidation of tryptophan in the aqueous phase decreases in the presence of polymers containing free amino groups (chitosan and polyallylamine). The decrease of the activity is accompanied by the change of the electronic absorption spectra of the TPSs. Analogues of chitosan with screened amino groups (chitosan sulfate and carboxymethylchitin) or without amino groups (carboxymethylcellulose), as well as hexamethylenediamine, a low-molecular-weight compound, do not affect the activity of the TPSs. The regularities observed can be accounted for by the association of molecules of the tetrapyrroles initiated by the complexation of the TPSs having external salt groupings with free amino groups of the polymers. 相似文献
109.
E. I. Aksenova 《Computational Mathematics and Mathematical Physics》2006,46(4):575-584
An implicit and an efficient three-level scheme for a parabolic equation in spherical coordinates is constructed in a spherical layer. No axial symmetry is assumed. The convergence rates of the schemes are estimated under minimum requirements on the initial data. The estimates are uniform with respect to the inner diameter of the domain. The order of convergence is τα/2 + h α, α = 1, 2, depending on the smoothness of the data. The results remain valid for a domain without a hole. 相似文献
110.
A. B. Solov’eva N. S. Melik-Nubarov N. A. Aksenova N. N. Glagolev G. V. Vstovskii V. S. Bugrin V. N. Luzgina V. A. Ol’shevskaya G. V. Belkova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(1):124-130
It was shown that water-insoluble porphyrins solubilized with pluronics (ternary block copolymers of ethylene oxide and propylene oxide) efficiently transfer photoexcitation energy to molecular oxygen dissolved in aqueous media to excite it into the singlet state, which is active in oxidizing organic substrates. It was established that the degree of solubilization of porphyrin photosensitizers (PPSs) γ defined as the proportion of PPS molecules passed into the aqueous phase in the dissolution of formed films depends on a single parameter, the initial ratio between the porphyrin and pluronic molar concentrations q. γ = γ(q) dependences for the solubilization of dissimilar water-insoluble porphyrins were analyzed. It was shown that the behavior of all the obtained γ = γ(q) dependences is changed at a characteristic value q max: when q ? q max, γ ~ 1, and, when q ≥ ?qmax, the degree of solubilization decreases. It was concluded that solubilized porphyrins are efficient photosensitizers in the oxidation of organic substrates (tryptophan). 相似文献