when power systems are expanded and connected together with weak tie lines, the low-frequency oscillations are increased and the stability margin of the power system decreases. therefore, when designing the transmission system to be used, it is necessary to maintain the dynamic stability of the power system, and to make sure to have the most possible stability margin. sssc is a facts device con...

consideration of the current-voltage (i-v) characteristics variations of solar modules with temperature and irradiations variations is basic for maximum power point tracking (mppt). having a simple and accurate mathematical model for the optimize utilization of the solar modules is essential. in this paper, a novel modeling of photovoltaic systems with novel coefficients is proposed for mathema...

power amplifiers (pas) are inherently nonlinear elements and digital predistortion is a highly cost-effective approach to linearize them. although most existing architectures assume that the pa has a memoryless nonlinearity, memory effects of the pas in many applications ,such as wideband code-division multiple access (wcdma) or orthogonal frequency-division multiplexing (ofdm), can no longer b...

this paper describes a study that starts with an analysis of typical energy demand profiles in a hospital setting followed by a case study of a combined cooling, heating, and power (cchp) generation system.cchp is an autonomous system that combines the generation of electrical, heating, and cooling energy.the driving units are two high-efficiency gas engines that produce electrical and heat ene...

this research is related to power conception and aims to investigate factors affectingwomen`s decision-making power in families. to do this, the resources theory has been reliedon in this research. based on the resources theory, occupation, education, income, job statusand property are the factors related to women`s decision-making power in families. in thisinvestigation, data was collected thr...

A hybrid computing technique is presented for improving the resolution of the discrete-space discrete-time (DSDT) resistive network method and the treatment of large scale systems encountered in the solution of partial differential equations.

RÉSUMÉ. Nous nous intéressons à la recommandation par des systèmes de filtrage collaboratif. Nous proposons de combiner une approche globale basée sur une factorisation matricielle et une approche locale basée sur l’exploitation directe d’un voisinage de l’utilisateur. L’hypothèse explorée dans l’article est que les jugements utilisateurs ont une sémantique et donc une utilité différente suivan...

background: this study is the first research investigating the possible effect of pulsed power signals on the characteristics of cortical bone by comparing the mechanical properties of this type of bone pre and post expose to pulsed power. methods: a positive buck-boost converter was applied to generate adjustable high voltage, high frequency pulses (up to 500 v and 10 khz). the functional beha...

A theoretical explanation of the observed splittings among the P states of charmonium is given with the use of a nonsingular potential model for heavy quarkonia. We also show that the recently observed mass difference between the center of gravity of the PJ states and the P1 state of cc̄ does not provide a direct test of the color hyperfine interaction in heavy quarkonia. Our theoretical value f...