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501.
V. I. Zubkov I. N. Yakovlev O. V. Koucherova T. A. Orlova 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(10):1406-1412
The wide possibilities of admittance spectroscopy as a tool for the effective study of relaxation processes in quantum-sized
heterostructures are demonstrated by the example of comprehensive investigations of InGaN/GaN semiconductor heterostructures
with multiple quantum wells. The nature of emitting centers in InGaN/GaN nanoheterostructures was determined from the character
of charge carrier relaxation, as revealed from the temperature spectra of conductance. 相似文献
502.
The localization of macrodeformation during the transition from plastic flow to ductile rupture is studied for a wide class
of metals. It is found that the mechanism behind this process is the same as that behind plastic deformation and as such can
be described as a change in the type of localized deformation autowave in the following sequence: phase autowave → steady
dissipative structure → collapse of autowave or its contraction at the site of ensuing failure. The kinetic characteristics
of an autowave collapsing at the prefailure stage, which can be found experimentally, allow one to predict the spatio-temporal
coordinates of rupture long before its signs appear. 相似文献
503.
A. G. Beirakhov I. M. Orlova E. G. Il’in A. S. Kanishcheva A. V. Churakov Yu. N. Mikhailov 《Russian Journal of Inorganic Chemistry》2012,57(7):945-952
A reaction of uranyl dioxalate complexes with methyl derivatives of alicyclic ??-dioximes, 3-methyl-1,2-cyclohexanedione dioxime and 3-methyl-1,2-cyclopentanedione dioxime, was studied. The structure of (CN3H6)4[(UO2)2(C6H8N2O2)(CO3)(C2O4)2] · (C6H10N2O2) · 2H2O and NH4(CN3H6)3[(UO2)2(C7H10N2O2)(CO3)(C2O4)2] · 2H2O based on binuclear complex anions with carbonate-dioximate fragment was studied by X-ray diffraction. 相似文献
504.
A. O. Orlova M. S. Gubanova V. G. Maslov A. V. Baranov A. V. Fedorov M. V. Artem’ev 《Theoretical and Experimental Chemistry》2012,48(1):62-71
We have studied complexes between CdSe/ZnS quantum dots and metal-free porphyrin molecule in aqueous solution and in human
blood plasma. We have established that in aqueous solution, transition of the porphyrin to a stable form occurs 2-5 h after
formation of the complexes. We have observed that the porphyrin molecules react with the components of the blood plasma, which
hinders direct formation of complexes between them and quantum dots in this medium. When previously prepared complexes between
quantum dots and porphyrin molecules are added to the blood plasma, they partially dissociate. In aqueous solutions and in
human blood plasma, we observe efficient intracomplex transfer of the photoexcitation energy from the quantum dots to the
porphyrin molecules. 相似文献
505.
L. I. Galanina N. S. Zelenskaya I. A. Konyukhova V. M. Lebedev N. V. Orlova A. V. Spassky 《Bulletin of the Russian Academy of Sciences: Physics》2013,77(4):443-446
Results from measuring the angular dependence of differential cross sections of elastic and inelastic deuteron scattering by the 24Mg nucleus with the formation of the ground and first excited states 2+, 1.369 MeV at E d = 15.3 MeV for deuteron angles interval from 21.5° to 161.5° (lab) are presented. Experimental results are compared with calculations in various approximations of the coupled channels model. The influence of heavy particle stripping mechanisms and consecutive particle transfer is also discussed. 相似文献
506.
I. A. Smirnov B. I. Smirnov T. S. Orlova D. Wlosewicz A. Hackemer H. Misiorek J. Mucha A. Jezowski J. Ramirez-Rico J. Martinez-Fernandez 《Physics of the Solid State》2013,55(2):454-460
This paper reports on measurement of the heat capacity at constant pressure C p of silicon bio-carbide prepared within the 5–300 K temperature interval from beech tree wood (bio-SiC(BE)), and within 80–300 K, from tree wood of sapele (bio-SiC(SA)), as well as SiC/Si ecoceramics of beech, sapele, and white eucalyptus wood. It has been shown that in bio-SiC(BE) the measured heat capacity contains a significant contribution of surface heat capacity, whose magnitude decreases with increasing temperature. Of the ecoceramics, only SiC/Si(SA) characterized by a high enough porosity has revealed a small contribution to the heat capacity coming from its surface component. The experimental results obtained are discussed. 相似文献
507.
A. I. Orlova A. E. Kanunov S. G. Samoilov A. Yu. Kazakova G. N. Kazantsev 《Crystallography Reports》2013,58(2):204-209
Orthophosphates Ca0.5Ti2(PO4)3, Ca0.5Zr2(PO4)3, Ca0.75Zr2(SiO4)0.5(PO4)2.5, and CaMg0.5Zr1.5(PO4)3 (structural type NaZr2(PO4)3), having different occupancies of interframework positions by calcium, have been prepared by the sol-gel method with the subsequent thermal treatment of dried gels and investigated by IR spectroscopy and X-ray diffraction. The analytical indexing of X-ray diffraction patterns is performed within the sp. gr. $R\bar 3$ . High-temperature X-ray diffraction was used to investigate the behavior of the orthophosphates upon heating: thermal expansion in the temperature range of 20–610°C (up to 500°C for Ca0.5Zr2(PO4)3). The coefficients of thermal expansion are calculated from the shift of diffraction peaks. The unit-cell parameters of crystals at different temperatures are determined. The dependences of thermal expansion and its anisotropy on the occupancy of cation M positions by calcium are revealed. 相似文献
508.
A. G. Beirakhov I. M. Orlova E. G. Il’in A. V. Churakov A. S. Kanishcheva Yu. N. Mikhailov 《Russian Journal of Inorganic Chemistry》2009,54(8):1217-1222
Uranylaqua complexes with N-methyl-, N-ethyl-, N-isopropyl-, and N,N-dimethylhydroxylamines were studied. The structure of [UO2{(CH3)2NO}2(H2O)2] was determined by X-ray crystallography. The N, N -dimethylhydroxylaminate ion is coordinated to uranyl through the nitrogen and oxygen atoms with the formation of a three-membered chelate ring. 相似文献
509.
510.
L. K. Markov T. S. Orlova N. N. Peschanskaya B. I. Smirnov Yu. P. Stepanov V. V. Shpeizman 《Physics of the Solid State》2003,45(9):1629-1633
Doping the YBaCuO superconducting ceramic with 3–5 wt % silver is shown to substantially increase its microplasticity and strength. Temperature spectra of microplastic strain rates for YBaCuO/Ag ceramics with 0, 1.6, 2.9, 4.2, and 7.6 wt % silver were obtained. The structure of the spectra and the relation of one of the peaks to the superconducting transition are discussed. The specific features of the I–V characteristics of samples cooled in a magnetic field are considered. It is shown that the position of the rising branch of a I–V characteristic depends on its origin; this observation can be used to fix two or more stable states of an HTSC-based memory cell. 相似文献