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排序方式: 共有40条查询结果,搜索用时 136 毫秒
1.
N. F. Bondarenko E. Z. Gak M. Z. Gak 《Journal of Engineering Physics and Thermophysics》2002,75(5):1234-1247
This paper gives an overview of the experimental results obtained by the method of MHD modeling in thin electrolyte layers and used to solve problems connected with the appearance of monotonic and vibrational instabilities. Primary consideration is given to the generation and interaction of transient vortex processes. As examples, the results of the investigations of flows in systems of two, three, and four vortices and periodic vortex structures, as well as of flows in the presence of obstacles of different permittivity modeling plants or technogenic screening devices intended to protect objects against pollution are presented. We consider the ways of using the results obtained in studying natural phenomena and in solving engineering-technical problems connected with mass and heat transfer and electrotransmission. 相似文献
2.
N. F. Bondarenko E. Z. Gak M. Z. Gak É. E. Rokhinson 《Journal of Engineering Physics and Thermophysics》1978,35(5):1317-1323
It is known that in nonuniform magnetic fields the precavitation properties of aqueous media change, leading to an increase in the irreversible physicochemical changes.Notation
l
length of zone II
- D and d
diameters of tubes I, III, and II
- pI, pII, pIII
pressures in regions I, II, and III
- pcr
critical pressure at which cavitation occurs
- pcr and p
cr
0
critical pressures in the magnetic field and when there is no magnetic field
- [VI, VII, VIII]
velocities of the liquid in regions I, II, and III
- VII, lim
velocity of the liquid at which breakdown of the hydrated layer occurs for a certain value of the induction
- Vcr and V
cr
0
critical velocities at which cavitation occurs in the magnetic field and when there is no magnetic field
- pa
atmospheric pressure
- psv
saturation-vapor pressure at the given temperature
-
density of the liquid
-
kinematic viscosity
- Re
Reynolds number
- Recr
critical Reynolds number
- cgf and cgd
concentrations of free and dissolved gases in the magnetic field and when there is no magnetic field
- cgf and cgd, and c
gf
0
and c
gd
0
concentrations of free and dissolved gases in the magnetic field and when there is no magnetic field
-
sc
space-charge density
-
electrical conductivity in the volume of the liquid
- b
electrical conductivity in the boundary layer
-
l
, g, d
dielectric constants of the liquid in the volume, of the gas in the bubbles, and of the diffusion layer
- j, jb, ji, and jT
current density of the general, boundary layer, induced and current flow
- fMHD and fEHD
volume forces of magnetohydrodynamic and electrodynamic nature (per unit volume)
- pMHD
pressure in the liquid due to the action of the magnetohydrodynamic forces
- 0
limiting shear stress in the liquid
- B
magnetic induction
- E
electric field strength in the volume of the liquid
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 35, No. 5, pp. 842–850, November, 1978. 相似文献
3.
N. F. Gol’dshleger A. S. Lobach V. Yu. Gak I. P. Kalashnikova V. E. Baulin A. Yu. Tsivadze 《Protection of Metals and Physical Chemistry of Surfaces》2014,50(5):599-607
Aggregation of magnesium octa-[(4′-benzo-15-crown-5)oxy]phthalocyaninate (Mgcr8Pc) in solutions of biocompatible anionic surfactant, sodium deoxycholate (SDC), was studied. It was shown using the electron absorption spectra that formation of Mgcr8Pc monomers in micellar solutions of SDC is affected by both increased surfactant concentration and by changes in the ionic strength of solution after sodium chloride is added. The effect of the chemical structure of biocompatible anionic surfactant on monomerization of crown-containing phthalocyanines was identified; this fact opens new possibilities for using this family of compounds for fluorescent diagnosis and photodynamic therapy. 相似文献
4.
Byeong Yeon Moon Jong Hyun Choi Jae Gak Kim Jin Jang Dae Won Kim Sang Soon Bae Kyung Shik Yoon 《Solar Energy Materials & Solar Cells》1997,49(1-4)
We have studied the fabrication of amorphous silicon (a-Si : H) p-i-n solar cells using an ion shower doped n+-layer. The p-i-n cells with ion-doped n+-layer exhibited open-circuit voltage of > 0.8 V, fill factor of > 0.62 and conversion efficiency of > 8.4% when the ion acceleration voltage was between 3 and 7 kV. The a-Si : H p-i-n solar cell fabricated under an optimized ion-doping condition exhibited an open-circuit voltage of 0.84 V, a fill factor of 0.66 and a conversion efficiency of 9.9% which was very similar to those of conventional a-Si : H p-i-n cells fabricated in the same deposition chamber. Therefore, ion shower doping technique can be applied to fabricate large area, high performance a-Si : H p-i-n solar cells. 相似文献
5.
Goldshleger N. F. Gak V. Yu. Kalashnikova I. P. Baulin V. E. Ivanchikhina A. V. Smirnov V. A. Shiryaev A. A. Tsivadze A. Yu. 《Protection of Metals and Physical Chemistry of Surfaces》2018,54(6):1092-1101
Protection of Metals and Physical Chemistry of Surfaces - Methods of absorption and fluorescence spectroscopy and, in some cases, small angle X-ray scattering, are used to study solubilization and... 相似文献
6.
7.
N. F. Bondarenko E. Z. Gak A. N. Gul'kov Yu. A. Zaslavskii 《Journal of Engineering Physics and Thermophysics》1980,39(1):760-763
It is shown that the effects which arise in natural waters when they flow through nonuniform magnetic fields are governed by an increase in the free gas concentration and hydrodynamic characteristics of these waters.Notation cfr.g
concentration of free gas in the liquid (in micro- and macrobubbles)
- cr.g
concentration of molecular-dissolved gas
- Re
Reynolds number
- patm
atmospheric pressure
- W
amount of gas removed from the liquid by evacuation
- n
multiplication factor of evacuation
- V
liquid flow velocity, m/sec
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 1, pp. 64–69, July, 1980. 相似文献
8.
Glass and Ceramics - 相似文献
9.
Joel Gak Matías Miguez Martín Bremermann Alfredo Arnaud 《Analog Integrated Circuits and Signal Processing》2008,57(1-2):39-48
Because of the extremely low amplitude of the input signal, the design of electro-neuro-graph (ENG) amplifiers involves a special care for flicker and thermal noise reduction. The task becomes really challenging in the case of implantable electronics, because power consumption is restricted to few hundreds μW. In this work, two different circuit techniques aimed to reduce flicker and thermal noise, in ultra-low noise amplifiers for implantable medical devices, are demonstrated. The circuit design, and measurement results are presented, in both cases showing an excellent performance, and noise to power consumption trade-off. In the first circuit, a very simple low-pass Gm–C chopper amplifier is used for flicker noise cancellation. It consumes only 28 mW, with a measured input referred noise and offset of 2 $ {{{\text{nV}}} \mathord{\left/ {\vphantom {{{\text{nV}}} {\sqrt {{\text{Hz}}} }}} \right. \kern-0em} {\sqrt {{\text{Hz}}} }} $ , and 2.5 μV, respectively. In the second circuit, a ultra-low noise amplifier, a energy-efficient DC–DC down-converter, and low voltage design techniques are combined, for the reduction of thermal noise with a minimum power consumption. Measured input referred noise in this case was 5.5 $ {{{\text{nV}}} \mathord{\left/ {\vphantom {{{\text{nV}}} {\sqrt {{\text{Hz}}} }}} \right. \kern-0em} {\sqrt {{\text{Hz}}} }} $ at only 380 μW power consumption. Both circuits were fabricated in a 1.5 μm technology. 相似文献
10.
N. F. Goldshleger V. Yu. Gak A. S. Lobach I. P. Kalashnikova V. E. Baulin A. Yu. Tsivadze 《Protection of Metals and Physical Chemistry of Surfaces》2018,54(2):174-184
This work is dedicated to low-molecular hydrogels based on biodegradable sodium deoxycholate (SDC) and lysine hydrochloride (lys × HCl) with magnesium octa-[(4'-benzo-15-crown-5)-oxy]phthalocyaninate (Mgcr8Pc) as the active component, namely, their synthesis, spectral properties of gel-solubilized Mgcr8Pc, its release from the gel etc. Addition of Mgcr8Pc occurs both via the mixing of the components and via its diffusion from the aqueous solution into the phase of the formed SDC/lys × HCl gel. Mgcr8Pc-containing hydrogels are thermoreversible. The state of Mgcr8Pc in the SDC/lys × HCl/NaCl gel at the room temperature and in the melt is studied using spectral methods. Gel melting releases Mgcr8Pc in the form of a micelle-bound monomer. The presence of the Mgcr8Pc monomer phase in the phthalocyanine-carrying supramolecular hydrogel causes fluorescent activity of the latter. 相似文献