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941.
As a sequel to [8], we investigate here the behaviour of thetrivial extensions of tilted algebras under stable equivalence.It will be shown that if a finite-dimensional symmetric algebra is stably equivalent to the trivial extension of a tilted algebraB, then is the trivial extension of some tilted algebra A whichhas the same type as B. 相似文献
942.
943.
S. W. Peng 《Heat and Mass Transfer》1994,29(8):501-505
Present paper presents a derivation of Luikov equations applicable to sublimation-drying. The physical situation and transfer mechanism are elucidated clearly. The coefficients appearing in Luikov equations are given in a more explicit way. Some formulation mistakes in recent publications are indicated.
Nomenclature C M v/V f, concentration of vapor, kg/m3 - c pv specific heat of vapor at constant pressure, J/kg K - c pw specific heat of adsorbed water at constant pressure, J/kg K - c s specific heat of solid skeleton, J/kg K - C s M s/V f, concentration of solid skeleton, kg/m3 - C w M w/V f, concentration of adsorbed water, kg/m3 - f V w/V f, volumetric fraction of adsorbed water - j F mass flux of vapor by diffusion (Fick) transfer, kg/m2 s - j D mass flux of vapor by filtration (Darcy) transfer, kg/m2 s - j v total mass flux of vapor, kg/m2 s - k permeability, m2 - M s mass of solid skeleton, kg - M v mass of vapor in pores, kg - M w mass of adsorbed water, kg - P pressure, Pa - q heat flux, W/m2 - R gas constant, J/kg K - T temperature, K - V f volume of the framework of porous medium, m3 - V v volume of vapor in porous medium, m3 - V w volume of the absorbed water, m3 Greek symbols /(c p), effective thermal diffusivity, m2/s - m effective vapor diffusivity in porous medium, m2/s - p R T /, Luikov pressure diffusivity, m2/s - +f, porosity of the porous medium - effective thermal conductivity of porous body, W/m K - dynamic viscosity of vapor, kg/m s - kinematic viscosity, m2/s - Ck/=k/, Luikov filtration motion coefficient, s - V v/V f, volumetric fraction of vapor - density of absorbed water, kg/m3 - (c p) M v c pv+M s c s+M w c pw /V f=Cc pv+C s c s+fc pw, effective product of density and specific heat of humid porous body, J/m3K 相似文献
Anwendung der Luikov-Gleichungen auf die Sublimationstrocknung
Zusammenfassung Die Untersuchung bezieht sich auf eine Ableitung der Luikov-Gleichungen, mittels deren sich der Vorgang der Sublimationstrocknung analysieren läßt. Physikalische Anfangssituation und Austauschmechanismen werden klar herausgestellt und die in den Luikov-Gleichungen auftretenden Koeffizienten in expliziter Weise angegeben. Ferner erfolgt Hinweis auf Formulierungsfehler in jüngeren Veröffentlichungen.
Nomenclature C M v/V f, concentration of vapor, kg/m3 - c pv specific heat of vapor at constant pressure, J/kg K - c pw specific heat of adsorbed water at constant pressure, J/kg K - c s specific heat of solid skeleton, J/kg K - C s M s/V f, concentration of solid skeleton, kg/m3 - C w M w/V f, concentration of adsorbed water, kg/m3 - f V w/V f, volumetric fraction of adsorbed water - j F mass flux of vapor by diffusion (Fick) transfer, kg/m2 s - j D mass flux of vapor by filtration (Darcy) transfer, kg/m2 s - j v total mass flux of vapor, kg/m2 s - k permeability, m2 - M s mass of solid skeleton, kg - M v mass of vapor in pores, kg - M w mass of adsorbed water, kg - P pressure, Pa - q heat flux, W/m2 - R gas constant, J/kg K - T temperature, K - V f volume of the framework of porous medium, m3 - V v volume of vapor in porous medium, m3 - V w volume of the absorbed water, m3 Greek symbols /(c p), effective thermal diffusivity, m2/s - m effective vapor diffusivity in porous medium, m2/s - p R T /, Luikov pressure diffusivity, m2/s - +f, porosity of the porous medium - effective thermal conductivity of porous body, W/m K - dynamic viscosity of vapor, kg/m s - kinematic viscosity, m2/s - Ck/=k/, Luikov filtration motion coefficient, s - V v/V f, volumetric fraction of vapor - density of absorbed water, kg/m3 - (c p) M v c pv+M s c s+M w c pw /V f=Cc pv+C s c s+fc pw, effective product of density and specific heat of humid porous body, J/m3K 相似文献
944.
945.
946.
947.
948.
949.
950.
Y. Lian H. Gao S. X. Dou H. Wang P. Ye Q. Guan J. Wang 《Applied physics. B, Lasers and optics》1994,59(6):655-658
Mechanism transitions of Self-Pumped Phase Conjugation (SPPC) with wavelength and doping concentration are observed in KTN:Fe (KTa1 –x
Nb
x
O3:Fe with
x
= 0.48) crystals. The SPPC mechanism in KTN: Fe (0.4 wt. %) crystal transforms from Stimulated Photorefractive Backscattering and Four-Wave Mixing (SPB-FWM) to cat (or total internal reflection) as the wavelength increases from 514.5 nm to 620 nm. SPPC at 514.5 nm is formed with the cat mechanism in a 0.2 wt. % doped KTN:Fe crystal, while with the SPB-FWM mechanism in a 0.4 wt. % doped one. These mechanism transitions are discussed with respect to the dependence of the backscattering gain coefficient of the crystals on wavelength and doping concentration. 相似文献