the objectives of this study were (a) to examine the writing performance of l2 learners on the level-specific tasks based on common european framework of reference (cefr) and (b) to investigate whether there was any difference between the students' self-assessed level of writing and the writing level reported by the raters. this study was conducted with 138 iranian students at ba and ma levels ...

this paper proposes a flexible power electronic transformer (fpet) for the application in the micro-grids. the low frequency transformer is usually used at the point of common coupling (pcc) to connect the low voltage grid and utility network to each other. the conventional 50hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. in this pap...

The single-phase transformerless grid-connected photovoltaic (PV) systems, mainly the low-power single-phase systems, require high efficiency, small size, lightweight, and low-cost grid-connected inverters. However, problems such as leakage current, the DC current injection and safety issues are incorporated with transformerless grid-connected PV inverters. Besides, the new standards such as Lo...

Making an initial tetrahedral grid for complex geometry can be a tedious and time consuming task. This paper describes a novel procedure for generation of starting tetrahedral cells using hexahedral block topology. Hexahedral blocks are arranged around an aerodynamic body to form a flow domain. Each of the hexahedral blocks is then decomposed into six tetrahedral elements to obtain an initial t...

During the last decade, where computational power has increased dramatically, and the use of the Internet plays a very important role both in our every day lives and in the evolution of Computer Science as we know it, two new terms have emerged; grid and cloud computing. The former refers to the combination of computer resources from multiple administrative domains for a common goal, as mention...

Occupational disengagement, social disengagement and retirement have remained very interesting topics of discussion among different professionals; gerontologist, geriatricians, social workers and pension administrators in the developing world. No doubt, this period in life especially in this part of the world, comes (though gradually) with a plethora of physiological, economic and psycho-social...

Grid Computing allows coordinated and controlled resource sharing and problem solving in multi-institutional, dynamic virtual organizations. Moreover, fault tolerance and task scheduling is an important issue for large scale computational grid because of its unreliable nature of grid resources. Commonly exploited techniques to realize fault tolerance is periodic Checkpointing that periodically ...