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1.
Several coats, such as gray cast iron, cast iron alloyed with nickel and copper, nickel-aluminum, Nichrome (nickel-chromium
alloy), bronze, etc., have been investigated. Corrosion resistance of coats in a medium based on drilling mud and sodium chloride
and sulfate solutions has been checked. Alloyed cast iron admixed with tin-based compounds showed the best results.
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Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 3, pp. 43–44, March, 2006. 相似文献
2.
R. N. Nenashev N. M. Kotova A. S. Vishnevskii K. A. Vorotilov 《Inorganic Materials》2016,52(6):625-629
We have studied the influence of methyltrimethoxysilane hydrolysis and condensation conditions in aprotic solvents on the formation, composition, and properties of thin polymethylsilsesquioxane films. The condensation of silanol groups and the structuring of the silicon–oxygen skeleton at different heat-treatment temperatures have been investigated by IR spectroscopy. The dielectric permittivity k and refractive index n of the films have been determined as functions of annealing temperature ta: at ta = 430°C, k = 2.75 and n = 1.38. 相似文献
3.
Yu. N. Morokov M. P. Fedoruk A. V. Dvurechenskii A. F. Zinov’eva A. V. Nenashev 《Semiconductors》2012,46(7):937-942
Ge/Si structures with vertically stacked quantum dots are simulated to implement the basic elements of a quantum computer for operation with electron spin states. Elastic-strain fields are simulated using the conjugate gradient method and an atomistic model based on the Keating potential. Calculations are performed in the cluster approximation using clusters containing about three million atoms belonging to 150 coordination spheres. The spatial distributions of the strain energy density and electron potential energy are calculated for different valleys forming the bottom of the silicon conduction band. It is shown that the development of multilayer structures with vertically stacked quantum dots makes it possible to fabricate deep potential wells for electrons with vertical tunnel coupling. 相似文献
4.
5.
This paper presents the results of a research and development study of a new metal-working tool using detonation spray hard alloy coating. The influence of a heat-insulating sublayer on thermal flows occurring at flow drilling has been studied. New design and technology to manufacture punches for plastic drilling with heat-insulating ceramic sublayer aimed at decreasing a parasitic thermal flow through the tool to the lathe’s spindle have been developed. In addition, a new design and manufacturing technology for replaceable cutting plates for lathe working involving the use of detonation spray hard alloy coating have been created. The proposed application of the new tool allows reduction of its conversion cost and improving of performance characteristics. 相似文献
6.
Smagina Zh. V. Dvurechenskii A. V. Seleznev V. A. Kuchinskaya P. A. Armbrister V. A. Zinovyev V. A. Stepina N. P. Zinovieva A. F. Nenashev A. V. Gutakovskii A. K. 《Semiconductors》2015,49(6):749-752
Semiconductors - The growth of Ge nanoclusters on a prepatterned Si (100) surface formed by imprint lithography in combination with subsequent irradiation with Ge+ ions is studied. The prepatterned... 相似文献
7.
D. S. Abramkin K. S. Zhuravlev T. S. Shamirzaev A. V. Nenashev A. K. Kalagin 《Semiconductors》2011,45(2):179-187
The problem of how the probability of trapping of charge carriers into quantum dots via the wetting layer influences the steady-state
and time-dependent luminescence of the wetting layer and quantum dots excited via the matrix is analyzed in the context of
some simple models. It is shown that the increase in the integrated steady-state luminescence intensity of quantum dots with
increasing area fraction occupied by the quantum dots in the structure is indicative of the suppression of trapping of charge
carriers from the wetting layer into the quantum dots. The same conclusion follows from the independent decays of the time-dependent
luminescence signals from the wetting layer and quantum dots. The processes of trapping of charge carriers into the InAs quantum
dots in the AlAs matrix at 5 K are studied experimentally by exploring the steady-state and time-dependent photoluminescence.
A series of structures with different densities of quantum dots has been grown by molecular-beam epitaxy on a semi-insulating
GaAs (001) substrate. It is found that the integrated photoluminescence intensity of quantum dots almost linearly increases
with increasing area occupied with the quantum dots in the structure. It is also found that, after pulsed excitation, the
photoluminescence intensity of the wetting layer decays more slowly than the photoluminescence intensity of the quantum dots.
According to the analysis, these experimental observations suggest that trapping of excitons from the wetting layer into the
InAs/AlAs quantum dots at 5 K is suppressed. 相似文献
8.
Smagina Zh. V. Novikov A. V. Stepikhova M. V. Zinovyev V. A. Rodyakina E. E. Nenashev A. V. Sergeev S. M. Peretokin A. V. Kuchinskaya P. A. Shaleev M. V. Gusev S. A. Dvurechenskii A. V. 《Semiconductors》2020,54(8):853-859
Semiconductors - The luminescence properties of arrays of spatially ordered self-assembled solitary Ge(Si) nanoislands and their groups, including those embedded in two-dimensional photonic... 相似文献
9.
Abramkin D. S. Petrushkov M. O. Emelyanov E. A. Nenashev A. V. Yesin M. Yu. Vasev A. V. Putyato M. A. Bogomolov D. B. Gutakovskiy A. K. Preobrazhenskiy V. V. 《Semiconductors》2021,55(2):194-201
Semiconductors - The possibility of forming a strained pseudomorphous quantum well (QW) consisting of a InxGa1 – xAsyP1 – y quaternary alloy upon the deposition of... 相似文献
10.
Smagina Zh. V. Zinoviev V. A. Rudin S. A. Rodyakina E. E. Novikov P. L. Nenashev A. V. Dvurechenskii A. V. 《Semiconductors》2020,54(14):1866-1868
Semiconductors - Space-arranged arrays of pits on Si(001) substrates were prepared using electron-beam lithography and plasma chemical etching. The positions of pits were arrange to the square and... 相似文献