In this article, a coupled computational framework is presented for the numerical simulation of mass transfer under the effects of natural convection phenomena in a field contains water-copper Nano-fluid. This CFD model is build up based on accurate algorithms for spatial derivatives and time integration. The spatial derivatives have been calculated using first order upwind and second order cen...

this article proposes a direct method for solving three types of integral equations with time delay. by using operational matrix of integration, integral equations can be reduced to a linear lower triangular system which can be directly solved by forward substitution. numerical examples shows that the proposed scheme have a suitable degree of accuracy.

Objective: Social participation in daily living the activities requires the maintenance of a variety of social relationships with others and engagement in various social activities. Proper social participation increases the feeling of attachment, provides a stable sense of identity, and increases one’s sense of worth, belonging, and dependence on society. Lack of social participation leads to a...

This paper analyzes the control method of a multiphase interleaved DC–DC converter for supercapacitor energy storage system integration in DC bus with reduced input and output filter size. A reduction size is achieved by operating only modes duty cycles that correspond to smaller current ripples. leads limited charging discharging process system. Therefore, detailed analysis optimal strategy pr...

Introduction: Irregular/blocked fields are routinely used in radiotherapy. The doses of these fields are usually calculated by means of equivalent square method that is inherently prone to uncertainty. On the other hand, Clarkson’s sector integration method is a dose calculation method which offers far better accuracy in dose calculation of irregular fields. The Scatter Air Ratio (SAR) of an in...

The present contribution is concerned with the incorporation of gradient-extended damage into reduced integration-based continuum finite elements. To this end, purely mechanical low-order solid and solid-shell elements based on isoparametric concept are combined a gradient extended two-surface plasticity model. Due to tailored combination integration hourglass stabilization, enhanced assumed st...

Solar sailing is a proposed means of space propulsion in which a reflective surface collects momentum from solar photons to accelerate a vehicle. The current trend within the solar sailing community is to increase sail size as solar sailing technologies advance, allowing for larger payloads and higher accelerations. However, with the miniaturization of modern payloads, sail sizes can be dramati...

This paper investigates a class of Lagrangian control systems with n degrees-offreedom (DOF) and n − 1 actuators, assuming that n − 1 virtual holonomic constraints have been enforced via feedback, and a basic regularity condition holds. The reduced dynamics of such systems are described by a second-order unforced differential equation. We present necessary and sufficient conditions under which ...