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1.
Khaimovich A. I. Bobrovskii N. M. Luk’yanov A. A. D’yakonov A. A. Kyarimov R. R. Selivanov A. S. 《Russian Engineering Research》2020,40(11):966-969
Russian Engineering Research - Attention focuses on the heat propagation in metal polycrystals where the grain or subgrain size affects the strengthening—as a result of surface plastic... 相似文献
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E. N. Selivanov V. M. Chumarev R. I. Gulyaeva V. P. Mar'evich A. D. Vershinin A. A. Pankratov E. S. Korepanova 《Inorganic Materials》2004,40(8):845-850
The iron calcium oxysulfides Ca3Fe4S3O6 and CaFeSO are synthesized by reacting mixtures of CaO and FeS in an inert atmosphere. Their elemental compositions and lattice parameters are determined by x-ray microanalysis and x-ray diffraction. From the temperature-dependent lattice parameters of the oxysulfides (measured up to 1020 K), their thermal expansion coefficients are evaluated. 相似文献
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M. N. Selivanov 《Measurement Techniques》1994,37(10):1113-1116
We consider the group of fundamental concepts involved in the unity of measurements and its maintenance.Translated from Izmeritel'naya Tekhnika, No. 10, pp. 15–17, October, 1994. 相似文献
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A. N. Opanasenko V. M. Selivanov N. N. Shan'gin 《Journal of Engineering Physics and Thermophysics》1980,39(4):1051-1056
Results are presented of a numerical and experimental investigation of the effect of natural convection on the structure of a liquid flow in a horizontal mixing chamber with changes in the temperature of the liquid at the inlet.Notation to, tin
initial temperature and temperature at the inlet to the channel
-
dimensionless temperature
-
a
heat conductivity
-
kinematic viscosity
-
coefficient of cubical expansion
-
density
- P
pressure
- g
acceleration due to gravity
- dequ
equivalent diameter of porous body
-
time
- vo
mean velocity at the inlet
- X and
dimensionless vertical and radial coordinates
- U and V
dimensionless vertical and horizontal components of velocity
- H
dimensionless height of channel
- R
radius of inlet to channel
- W
velocity of liquid
- t
temperature drop along channel height
- Re = voR/
Reynolds number
- Pe = voR/a
Peclet number
- Fr = v
o
2
/g¦tin–to R
Froude number
- Ho = vo/R
homochroneous number
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 4, pp. 603–610, October, 1980. 相似文献
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V. A. Kovrov A. P. Khramov Yu. P. Zaikov V. M. Chumarev E. N. Selivanov 《Russian Journal of Non-Ferrous Metals》2014,55(1):8-14
In order to fabricate oxide-metallic composites with the composition 25.3NiO-41.2Fe2O3-13.5Cr2O3-20.0Cu (wt %), the temperature and duration of sintering (1350°C, 30 min) that ensure the formation of the solid solution of chromium oxide in nickel ferrite have been determined. This material is tested as an anode for the electrolysis of the low-temperature solution with the composition 12.0NaF-36.8KF-51.2AlF3 (wt %), which was saturated with Al2O3 (t = 800°C). The amount of gaseous oxygen evolved on the anode was measured. It is shown that the main reaction on an anode at current density i = 0.015–1.0 A cm?2 is the oxidation of oxygen-containing anions from a melt with the formation of gaseous O2 and a substantial increase in the oxidation rate of the composite anode is observed at i > 1.0 A cm?2. The voltage across the electrolyzer (4.5 ± 0.5 V) and the anodic potential (2.43 ± 0.2 relative to the Al reference electrode) during a prolonged experiment (for 89 h, i = 0.4 A cm?2) indicate a stable and acceptable electrical conductivity of the material, while the dissolution rate, which was calculated by the weight loss (0.6 kg/yr) and volume loss (0.7 cm/yr), satisfy the requirements to inert anodes. 相似文献