This article presents an analysis of the different loss modes switching devices in a class-D series resonant converter operating with either fixed dead time or duty cycle. A feasible region where FETs inverter stage only exhibit reverse conduction losses, no hard-switching, is identified. Furthermore, impact using versus cycle investigated. We find that superior to cycle, as broader range can b...

The fact that distillation columns, even in the ideal binary case, may display multiple steady states and unstable operating points has only recently been recognized. This article addresses some implications of these phenomena for the operation and control of distillation columns. Under manual operation, the multiplicity and instability will result in inability to reach separations correspondin...

The economical and secure operation of power systems has significant importance. Due to technical limitations, the best economical operation point is not always the desired operating point for system stability or power losses. In this study, first, the most economical operating point is obtained by solving the nonlinear, network-constrained economic dispatch problem using a genetic algorithm. T...

Through wall imaging (TWI) using microwave radar system is an experimental approach in real time to collect the information about the living/nonliving target object hidden behind the wall made of any dielectric material and unknown thickness. The true and exact information of the target object is dependent not only on the wall parameters (thickness and dielectric constant) but also on the opera...

The purpose of this study is exploring expectation gap among university students and auditors points of view about importance of fraud risk components. To get this purpose, university students' ideas and auditors about importance of each mentioned fraud risk components in Iranian auditing standard No. 24 under the title of "the auditor’s responsibilities relating to fraud in an audit of financi...

in this paper, using the best proximity theorems for an extensionof brosowski's theorem. we obtain other results on farthest points. finally, wedene the concept of e- farthest points. we shall prove interesting relationshipbetween the -best approximation and the e-farthest points in normed linearspaces (x; ||.||). if z in w is a e-farthest point from an x in x, then z is also a-best ...

receiver operating characteristics (roc) curves have numerous applications for identifying a cut-off point in diagnostic tests. nonetheless, given that sometimes two cut-off points have to be specified simultaneously, the roc curve can be used to identify such points. the volume under the roc surface (vus) serves as a criterion for the accuracy of diagnostic tests. one of the unfortunate outcom...

background: the body mass index (bmi) is widely used to diagnose overweight and obesity. however, there are limitations on the use of bmi and development of alternative measures can be of clinical importance. this study aimed to compare specificity and sensitivity of weight for height (w/h), waist circumference (wc) and waist-to-height ratio (whtr) with bmi-for-age in diagnosing overweight and ...