نتایج جستجو برای: density current
تعداد نتایج: 1151732 فیلتر نتایج به سال:
In the 1970s Lawrence Berkeley Laboratory (LBL) was testing high current density magnets where EJ 2 limit up to two orders of magnitude higher than quench protection methods period would permit at time. LBL designing a (J) thin solenoid with large volume and stored energy (E). The accepted time ...
ni-w coatings, compared to pure nanocrystalline ni, exhibit higher hardness and wear resistance. in some cases, these coatings are considered as environmental friendly alternatives for hard chromium coating. till now, most of ni-w coatings have been produced by direct current electrodeposition from alkaline baths. in this study square pulse current was used for deposition of ni-w precipitates f...
In this paper, the Y1-xCdxBa2Cu3O7-δ superconductor with x=0, 0.05, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5 are prepared using the solid state method and the structure, electrical resistance, critical current density and critical temperature of it, have been studied. The results show that these doping do not affect so much on the structure and lattice parameters. The electrical resistance of samples incr...
چکیده ندارد.
In this study, removal of methylene blue by electro-coagulation method using aluminum and iron electrodes was investigated. The influence of the operating parameters such as contact time, current density, anode type, inter-electrodes distance, initial and final pH and energy consumption rate was determined. Dye removal was increased with increases in solution pH, current density and c...
The shape and geometry of the flow field have considerable effects on the transfer rate of the reactants toward the catalyst layer and consequently the performance of the polymer electrolyte membrane (PEM) fuel cell. In this study, a novel PEM fuel cell with pin-type flow field is proposed in order to reduce the wake regions, increase the oxygen transfer rate into the catalyst layer and the cur...
This paper has examined the analytical solution of steady fully developed natural convective flow of a viscous incompressible and electrically conducting fluid between vertical channel by taking the Hall current and induced magnetic field into account. We have obtained the non-dimensional simultaneous ordinary differential equations using the suitable non-dimensional variables and parameters in...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید