The computational study of the combined effects of radiation and hydro- magnetics on the natural convection flow of a viscous, incompressible, and electrically conducting fluid past a magnetized permeable vertical pla...The computational study of the combined effects of radiation and hydro- magnetics on the natural convection flow of a viscous, incompressible, and electrically conducting fluid past a magnetized permeable vertical plate is presented. The governing non-similar equations are numerically solved by using a finite difference method for all values of the suction parameter and the asymptotic solution for small and large values of ~. The effects of varying the Prandtl number Pr, the magnetic Prandtl number Prm, the magnetic force parameter S, the radiation parameter Rd, and the surface temperature Ow on the coefficients of the skin friction, the rate of heat transfer, and the current density are shown graphically and in tables. An attempt is made to examine the effects of the above mentioned physical parameters on the velocity profile, the temperature distribution, and the transverse component of the magnetic field.展开更多
MgB2 is a relatively new superconductor; it has attracted great interest from superconductor researchers all over the world. Thorough investigations have been carried out to study the material fabrication, as well as ...MgB2 is a relatively new superconductor; it has attracted great interest from superconductor researchers all over the world. Thorough investigations have been carried out to study the material fabrication, as well as to study the material and superconducting properties from a fundamental physics point of view. The University of Wollongong has played a very active role in this research and a leading role in the research on high critical current density and high critical magnetic fields. Our recent research on the improvement of critical current density and the upper critical magnetic field by carbon-based compound doping is reviewed in this paper.展开更多
Flash sintering has proven to be a novel and cost-efficient technique that enables the successful processing of dissimilar materials.The present work investigated how sintering under electric field input progresses in...Flash sintering has proven to be a novel and cost-efficient technique that enables the successful processing of dissimilar materials.The present work investigated how sintering under electric field input progresses in commercial anatase(A)plus rutile(B)polymorphs containing titania.Both the phase evolution and sintering dynamics were highly dependent on the strength of the field,the application of which led to(A+R)→R→flash at low fields while promoting(A+R)→flash at high fields.A temperature postponement of flash was verified at low fields,as the event was preceded by the A→R transformation,which was responsible for a detectable peak in the thermal spectra of the current.The processing temperature,applied electric field(E),and onset flash sintering temperature(T^(flash)_(furn))combine well into a phase diagram graph that summarizes the phase development that applies to this material.In addition,high-density bodies in the rutile phase were ultimately produced after flashing under a suitable current density,regardless of the field strength considered.Both the flash sintering temperature and average grain size(AGS)decreased with increasing field.In line with this,we demonstrate the existence of a direct link between the grain size and the sample sintering temperature,which is consistent with the classical grain growth model.展开更多
文摘The computational study of the combined effects of radiation and hydro- magnetics on the natural convection flow of a viscous, incompressible, and electrically conducting fluid past a magnetized permeable vertical plate is presented. The governing non-similar equations are numerically solved by using a finite difference method for all values of the suction parameter and the asymptotic solution for small and large values of ~. The effects of varying the Prandtl number Pr, the magnetic Prandtl number Prm, the magnetic force parameter S, the radiation parameter Rd, and the surface temperature Ow on the coefficients of the skin friction, the rate of heat transfer, and the current density are shown graphically and in tables. An attempt is made to examine the effects of the above mentioned physical parameters on the velocity profile, the temperature distribution, and the transverse component of the magnetic field.
基金This work was supported by the Australian Research Council (ARC) underGrant No. DP0557544.
文摘MgB2 is a relatively new superconductor; it has attracted great interest from superconductor researchers all over the world. Thorough investigations have been carried out to study the material fabrication, as well as to study the material and superconducting properties from a fundamental physics point of view. The University of Wollongong has played a very active role in this research and a leading role in the research on high critical current density and high critical magnetic fields. Our recent research on the improvement of critical current density and the upper critical magnetic field by carbon-based compound doping is reviewed in this paper.
基金supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brazil(CAPES),under Finance Code 001the Conselho Nacional de Desenvolvimento Científico e Tecnológico-Brazil(CNPq),under grant Nos.309410/2017-7 and 308474/2021-0the Fundação de AmparoàPesquisa do Estado de São Paulo-Brazil(FAPESP),under grants Nos.12/06448-0 and 07/54974-5.R.N.R.
文摘Flash sintering has proven to be a novel and cost-efficient technique that enables the successful processing of dissimilar materials.The present work investigated how sintering under electric field input progresses in commercial anatase(A)plus rutile(B)polymorphs containing titania.Both the phase evolution and sintering dynamics were highly dependent on the strength of the field,the application of which led to(A+R)→R→flash at low fields while promoting(A+R)→flash at high fields.A temperature postponement of flash was verified at low fields,as the event was preceded by the A→R transformation,which was responsible for a detectable peak in the thermal spectra of the current.The processing temperature,applied electric field(E),and onset flash sintering temperature(T^(flash)_(furn))combine well into a phase diagram graph that summarizes the phase development that applies to this material.In addition,high-density bodies in the rutile phase were ultimately produced after flashing under a suitable current density,regardless of the field strength considered.Both the flash sintering temperature and average grain size(AGS)decreased with increasing field.In line with this,we demonstrate the existence of a direct link between the grain size and the sample sintering temperature,which is consistent with the classical grain growth model.
