Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
We investigate the effects of slip and radiation on magnetoconvection flow of a chemically reacting fluid near a stagnation-point\ntowards a vertical plate embedded in a porous medium analytically and numerically.The governing partial differential equations\nare diminished into the coupled ordinary differential equations by similarity transformations. Then they are solved analytically by\nhomotopy analysis method and solved numerically by shooting method with RK fourth-order method. In this study, the analytical\nand numerical results are compared for many combinations of parameters.The rates of heat and mass transfer are calculated.The\nvelocity profile near the plate overshoots on increasing the slip parameter. The concentration and temperature are decreasing on\nincreasing the slip parameter....
Recently, the accelerated successive overrelaxation- (SOR-) like (ASOR) method was proposed for saddle point problems. In\nthis paper, we establish a generalized accelerated SOR-like (GASOR) method and a modified accelerated SOR-like (MASOR)\nmethod, which are extension of the ASOR method, for solving both nonsingular and singular saddle point problems. The sufficient\nconditions of the convergence (semiconvergence) for solving nonsingular (singular) saddle point problems are derived. Finally,\nnumerical examples are carried out,which show that the GASOR and MASOR vmethods have faster convergence rates than the SORlike,\ngeneralized SOR (GSOR), modified SOR-like (MSOR-like), modified symmetric SOR (MSSOR), generalized symmetric SOR\n(GSSOR), generalized modified symmetric SOR (GMSSOR), and ASOR methods with optimal or experimentally found optimal\nparameters when the iteration parameters are suitably chosen....
A new technology of composite micromachining of laser and electrolysis is presented through a combination of technological\nadvantages of laser processing and electrolyticmachining. The implication of its method is that laser processing efficiently removes\nmetallic materials and that pulse electrolyticmachining removes recast layer and controls shape precisely.Machining accuracy and\nefficiency can be improved.Theimpacts that electrolyte fluid effectively cools the microstructure edge in the laser machining process\nand that gas-liquid two-phase flow makes the electrolyte conductivity produce uneven distribution in the electrolytic processing\nare considered. Some approximate assumptions are proposed on the actual conditions of machining process. The mathematical\nmodel of composite micromachining of laser and electrolysis based on the electrolyte fluid is built. The validity of the model can\nbe verified by experimentation. The experimental results show that processing accuracy meets accuracy requirements which are\n�±0.05 mm. Machining efficiency increases more than 20 percent compared to electrolytic processing....
Relative position of seismic source and sensors has great influence on locating accuracy, particularly in far field conditions, and\nthe accuracy will decrease seriously due to limited calculation precision and prior velocity error. In order to improve the locating\naccuracy of far field sources by isometric placed sensors in a straight line, a new locating method with nonprior velocity is proposed.\nAfter exhaustive research, this paper states that the hyperbola which is used for locating will be very close to its asymptote when\nseismic source locates in far field of sensors; therefore, the locating problem with prior velocity is equivalent to solving linear\nequations and the problem with nonprior velocity is equivalent to a nonlinear optimization problem with respect to the unknown\nvelocity. And then, this paper proposed a new locating method based on a one-variable objective function with respect to the\nunknown velocity. Numerical experiments show that the proposed method has faster convergence speed, higher accuracy, and\nbetter stability....
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