In this study, a new method for joining aluminum tubes in subsurface structures using steel converting and aluminum welding are presented and reviewed. But near the weld area is under high thermal cycle and will cause residual stresses in heat affected zone. Therefore for assessment of proposed connection from the perspective of residual stress by using the finite element method welding of tu...

the suitability of milk preserved by refrigeration and co2 addition for the manufacture of plain yoghurt using two commercial strains of lactobacillus delbrueckii ssp. bulgaricus and streptoccocus thermophilus and probiotic yoghurt by lactobacillus acidophilus was evaluated. yoghurts (plain and probiotic) manufactured after milk pasteurization, from fresh and refrigerated co2 treated samples (p...

Abstract The mean residual life function (mrlf) of a subject is defined as the expected remaining lifetime of the subject given that the subject has survived up to a given time. The commonly used regression models as proportional mean residual life (PMRL) and linear mean residual life (LMRL) have limited applications due to adhoc restriction on the parameter space. The regression model we propo...

Residual gas saturation is one of the most important parameter in determining recovery factor of water-drive gas reservoir. Visual observation of processes occurring at the pore level in micromodels can give an insight to fluid displacements at the larger scale and also help the interpretation of production performance at reservoir scale. In this study experimental tests in a glass micromod...

This paper considers a class of optimization problems arising in wireless communication systems. We analyze the optimal control and the associated Hamilton–Jacobi–Bellman (HJB) equations. It turns out that the value function is a unique viscosity solution of the HJB equation in a certain function class. To deal with the fast growth condition of the value function in establishing uniqueness, we ...

In this article, we study the effect of variable viscosity on the flow and vortex instability of non-Darcian free convection boundary layer flow on a horizontal surface in a saturated porous medium. The wall temperature is a power function of the distance from the origin. The variation of viscosity is expressed as an exponential function of temperature. The transformed boundary layer equations,...

We study the Bellman equation for undiscounted exit time optimal control problems for nonlinear systems and nonnegative instantaneous costs using the dynamic programming approach. Using viscosity solution theory, we prove a uniqueness theorem that characterizes the value functions for these problems as the unique viscosity solutions of the corresponding Bellman equations that satisfy appropriat...

A man with metastatic carcinoma of the colon had a bone scan which revealed urinary retention in the left kidney. Ten months later, a Tc-99m-DTPA renai glomerular study showed the left kidney to have only 8% of total renal function. Fifteen months after that, (he same kidney demonstrated 9% of total function, while the right kidney had evolving obstruction due to his neoplasm. The case sh...