University of Bahrain

About: University of Bahrain is a education organization based out in Madīnat ‘Īsá, Bahrain. It is known for research contribution in the topics: Thin film & Doping. The organization has 1650 authors who have published 3405 publications receiving 48162 citations. The organization is also known as: Bahrain University & UoB.

Synchronous generator damping enhancement through coordinated control of exciter and SVC

Abstract: Damping improvement of a weakly connected generating system through control of excitation and static VAr compensators has been investigated. Stabilising signals derived through a minimum time quasioptimum feedback strategy have been tested on a synchronous generator infinite bus system connected through a long transmission line. The response was compared with standard linear state and output regulator formulations. It was observed that although excitation control enhances the stability of the system, the SVC provides most of the damping. The proposed feedback strategy with coordinated control of excitation and SVC were found to provide a much superior response compared to the standard techniques.

Testing weak‐form efficiency in the Bahrain stock market

Abstract: Purpose – This study seeks to measure the behaviour of stock prices in the Bahrain Stock Exchange (BSE), which is expected to follow a random walk. The aim of the study is to measure the weak‐form efficiency.Design/methodology/approach – Random walk models such as unit root and Dickey‐Fuller tests are used as basic stochastic tests for a non‐stationarity of the daily prices for all the listed companies in the BSE. In addition, autoregressive integrated moving average (ARIMA) and exponential smoothing methods are also used. Cross‐sectional‐time‐series is used for the 40 listed companies over the period 1 June 1990 up until 31 December 2000.Findings – Random walk with no drift and trend is confirmed for all daily stock prices and each individual sector. Other tests, such as ARIMA (AR1), autocorrelation tests and exponential smoothing tests also supported the efficiency of the BSE in the weak‐form.Practical implications – The finding of the study is a necessary piece of information for all investors whether ...

Modeling and Simulation of Dynamic Voltage Restorer (DVR) Based on Hysteresis Voltage Control

Abstract: Dynamic Voltage Restorers are utilized to protect sensitive loads from voltage sags and swells which take place in the distribution systems. In this paper, a Dynamic Voltage Restorer (DVR) based on hysteresis voltage control is proposed. The DVR is modeled using Simulink'SimPowerSystem Toolbox. Discrete Fourier Transform (DFT) is used to detect the magnitude and phase jump of the voltage sag and swell. The influence of the band of the hysteresis voltage controller on the quality of the load voltage and DVR voltage is studied. The DVR is tested for three- phase voltage sag and swell with phase jump to validate the proposed control scheme.

Unified guidelines and resources for Arabic dialect orthography

Abstract: Arabic dialects; Conventions; Dialectal arabics; Orthography; Phonology; Standard arabics; Morphology