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排序方式: 共有324条查询结果,搜索用时 218 毫秒
101.
102.
103.
Structuring of Multiphase Compacts in the SiC′ ― Carbon System. Part 2. Structuring during Sintering
We have studied the effect of particle sizes in the starting powders in the silicon carbide carbon system, and also effects on the structure and phase composition of self-bonded silicon carbide (SBSC) that are associated with structural interactions between the starting components. 相似文献
104.
Yuliya S Dzyazko Yurii M Volfkovich Valentin E Sosenkin Nadejda F Nikolskaya Yurii P Gomza 《Nanoscale research letters》2014,9(1):271
The aim of the work was to elucidate the nature of charge-selective properties of macroporous composite inorganic membranes modified with nanoparticles of hydrated zirconium dioxide. The membranes have been investigated using methods of standard contact porosimetry, potentiometry, electron microscopy and small-angle X-ray scattering. The ion exchanger has been found to deposit inside pores of ceramics. Differential curves of pore volume distribution have been resolved using Lorentz functions; each maximum has been related to structure elements of the matrix and ion exchanger by means of calculations according to homogeneous and heterogeneous geometrical models. It was found that the voids, the radius of which is 4 to 8 nm, are responsible for charge selectivity of the composite membranes. These pores are formed due to blocking of macropores of ceramics with aggregates of nanoparticles of the ion exchanger; the radius of these aggregates is 20 to 24 nm. The membranes were applied to desalination of the solution containing NaCl. The removal degree of the salt from the solution reached 95% and 9% for the composite and unmodified membranes, respectively. 相似文献
105.
106.
Yurii S. Kovshov Sergey S. Ponomarenko Sergey S. Kishko Alexander Likhachev Alexander Danik Lyudmila Mospan Sergiy Steshenko Eduard M. Khutoryan Alexei N. Kuleshov 《Journal of Infrared, Millimeter and Terahertz Waves》2018,39(11):1055-1064
Extension of the theory of a clinotron is developed by use of the scattering matrix of an oversized T-junction on the ends of a slow wave system. The matrix contains elements corresponding to the transformation of slow grating modes into fast ones and vice versa. Those fast waves with low ohmic losses provide strong resonant properties of a clinotron even in the case of strong attenuation of the surface mode. Results of the theoretical simulation are compared with experimental ones and obtained dependencies explain strong resonances in sub-THz clinotrons. 相似文献
107.
I. M. Poletika T. A. Krylova M. G. Golkovskii A. G. Lunev Yu. A. Chumakov S. A. Makarov 《Protection of Metals and Physical Chemistry of Surfaces》2011,47(2):225-235
Multifunctional coatings have been developed using the method of nonvacuum electron-beam welding deposition of chromium carbide
powder on low-carbon steel. The correlation dependences of the ultrasonic velocity, the thickness of coatings, the content
of chromium in the coatings, and the loss of mass under exposure to corrosive media on the mechanical properties are constructed
using the bend tests. It was shown that the observed correlation relations are mainly determined by two factors, i.e., the
presence of a substitute doping agent of chromium in a solid solution and the character of a dislocation structure, which
forms inside of the grain. 相似文献
108.
A. I. Chumakov 《Russian Microelectronics》2011,40(3):149-155
The estimations of equivalent values for linear energy transfer of heavy charged particles based on the results of experimental
investigations of sensitivity of LSICs to local radiation effects with the use of the procedure of local laser irradiation
are presented. The possibility of recalculation of the energy of laser radiation into equivalent values of linear energy transfer
with the use of the measurements of the ionization reaction in the supply circuit of LSIC is substantiated. Uncertainties
caused by the characteristics of the interaction of optical radiation with semiconductor structures are eliminated in the
suggested procedure. 相似文献
109.
Alexei Apisarov Alexander Dedyukhin Elena Nikolaeva Pavel Tinghaev Olga Tkacheva Alexander Redkin Yurii Zaikov 《Metallurgical and Materials Transactions B》2011,42(1):236-242
The effect of calcium fluoride on liquidus temperatures of the cryolite melts with a low cryolite ratio (CR) was studied.
The systems KF-NaF-AlF3 and KF-LiF-AlF3 with CRs of 1.3, 1.5, and 1.7 have been investigated. The liquidus curves of systems containing CaF2 are different and depend on the K/(K + Na) and K/(K + Li) ratios. In potassium cryolite with CRs of 1.3 and 1.5, the calcium
fluoride solubility is low and increases with NaF (LiF) concentration. 相似文献
110.
Lunz M Gerard VA Gun'ko YK Lesnyak V Gaponik N Susha AS Rogach AL Bradley AL 《Nano letters》2011,11(8):3341-3345
Surface plasmon enhanced Fo?rster resonant energy transfer (FRET) between CdTe nanocrystal quantum dots (QDs) has been observed in a multilayer acceptor QD-gold nanoparticle-donor QD sandwich structure. Compared to a donor-acceptor QD bilayer structure without gold nanoparticles, the FRET rate is enhanced by a factor of 80 and the Fo?rster radius increases by 103%. Furthermore, a strong impact of the donor QD properties on the surface plasmon mediated FRET is reported. 相似文献