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71.
I. K. Kamilov A. G. Gamzatov A. M. Aliev A. B. Batdalov Sh. B. Abdulvagidov O. V. Mel’nikov O. Yu. Gorbenko A. R. Kaul’ 《Journal of Experimental and Theoretical Physics》2007,105(4):774-781
We have measured the resistivity, magnetoresistance, and thermopower of ceramic manganite samples La1 ? x Ag y MnO3 (y ≤ x) doped with silver as functions of temperature (4.2–350 K) and magnetic field (up to 26 kOe). A metal-insulator phase transition is observed in all investigated samples at temperatures close to room temperature. The behavior of the resistivity and thermopower in the high-temperature paramagnetic region is interpreted using the concept of small radius polaron; the activation energy decreases with increasing doping level. The resistivity in the low-temperature ferromagnetic region is approximated by the expression ρFM(T) = ρ0 + AT 2 + BT 4.5 presuming the existence of electron-electron and electron-magnon interactions. A resistivity minimum and a strong magnetoresistive effect are observed at low temperatures. The latter effect is associated with scattering of charge carriers at grain boundaries, which are antiferromagnetically ordered relative to one another. The temperature dependence of thermopower in the magnetically ordered phase is described in the framework of a model taking into account the drag of charge carriers by magnons. 相似文献
72.
S. A. Ganebny A. I. Krasov V. S. Patsko M. A. Smol’nikova 《Proceedings of the Steklov Institute of Mathematics》2010,269(1):121-133
The adaptive control method is applied to the problem of the vertical passage of obstacles by an aircraft under wind disturbance. Constructions of the theory of differential games are used. 相似文献
73.
Photolysis of the alkylperoxy radicals ≡SiOCH2OO and ≡SiOCH2CH2OO grafted onto an activated surface of silica was found to be accompanied by photochemical radical chain reactions. 相似文献
74.
Ya. I. Korenman E. I. Mel’nikova S. I. Niftaliev S. E. Boeva A. A. Selivanova E. S. Rudnichenko E. V. Bogdanova 《Russian Journal of Applied Chemistry》2009,82(8):1380-1383
System of sensors operating on the piezoquartz microweighing principle was employed to forecast the storage life of food products
based on milk serum. Signals from the sensors are integrated into an output signal forming a recognizable “visual pattern”
of an odor. 相似文献
75.
76.
V. L. Mel’nik 《Ukrainian Mathematical Journal》2000,52(3):464-469
We present a topological classification of linearly convex domains with almost smooth boundary whose singularities lie in
a hyperplane. We investigate sets with linearly convex boundary and the closures of linearly convex domains. 相似文献
77.
78.
79.
I. Yu. Goryacheva G. V. Mel’nikov S. N. Shtykov A. S. Ponomarev 《Journal of Analytical Chemistry》2000,55(8):795-798
The possibility of determining pyrene, anthracene, and fluorene in gasoline by phosphorimetry at room temperature after the
micellar extraction with sodium dodecyl sulfate was examined. It was found that the above polynuclear aromatic hydrocarbons
simultaneously present in gasoline can be selectively determined by room-temperature phosphorimetry using different techniques
for the excitation and population of the triplet states of luminophore (stationary and pulse excitation and triplet energy
transfer). The proposed procedure was verified by gas chromatography with a mass-selective detector. 相似文献
80.
I.?D.?AkhmadovEmail author N.?E.?Mel′nikova A.?Z.?Babayeva V.?M.?Akhmedov 《Journal of Structural Chemistry》2017,58(4):775-781
Novel Pd(0) nanocomposites using polycaprolactam as a reducing and stabilizing matrix are synthesized. Data on the nanoparticle formation mechanism in a polycaprolactam matrix under the conditions of changing pH of the medium and reagent concentration ratios are obtained. The nanocomposite structure is studied by electron and infrared spectroscopy, X-ray diffraction analysis, atomic force and transmission electron microscopy. The size of metal-containing particles in the composite composition and their size distribution are determined. The obtained nanocomposites can serve as heterogeneous catalysts. 相似文献