Research ArticleOpen accessIn the abstractImproving Mechanical Characteristics of Inverter-induction Motor Drive SystemHussein Sarhan, Rateb IssaAn inverter-three-phase squirrel-cage induction motor drive system with improved mechanical characteristics is presented. The proposed system provides mechanical characteristics with constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency. The control algorithm is based on the constant volts per hertz principle using two improvement techniques: keeping maximum torque constant or keeping magnetic … …American Journal of Applied Sciences, Vol. 3, Issue 8 · 31 Aug 2006 · 7,661 accessesView PDFCite
Research ArticleOpen accessIn the abstractMixed Mode EMI Noise Level Measurement in SMPSR. Dhanasekaran, M. Rajaram, S. N. SivanandamFast switching in SMPS generate large amount of Electromagnetic Interference (EMI).The proposed method to determine Common Mode (CM) and Differential Mode (DM) noise of a low power Switched Mode Power Supply (SMPS) using two-probe approach i.e. using one current probe as an injecting probe and other current probe as receiving probe Common Mode (CM) noise is measured between power line … …American Journal of Applied Sciences, Vol. 3, Issue 5 · 31 May 2006 · 7,415 accessesView PDFCite
Research ArticleOpen accessIn the abstractAntitussive Activity Directed Isolation of Compounds from Onosma hispidumShahina Naz, Rafeeq A. Khan, Rahmanullah Siddiqi, Syed A. SayeedThe chemical investigation of the ethanolic extract of the root bark of Onosma hispidum following antitussive activity directed isolation led to the isolation of 4-hydroxy-3-methoxy cinnamic acid (mCA) and 4-hydroxy-3-methoxy benzoic acid (mBA) which have been reported for the first time in this species. Antitussive activity of the compounds was evaluated by reduction in frequency of cough induced by SO2 … …American Journal of Pharmacology and Toxicology, Vol. 1, Issue 1 · 31 Mar 2006 · 7,326 accessesView PDFCite
Research ArticleOpen accessIn the abstractStudy of the Flow Structure of A Thermal Plume Evolving in an Unlimited and in A Semi-Enclosed EnvironmentJamil Zinoubi, A. Ould Mohamed Mahmoud, Taoufik Naffouti et al.The basic objective of this study was to better knowledge the fine flow structure of thermal plume created by a heated disk, evolving in an unlimited and in a semi-enclosed environment. The flow visualization and the study of the temperature fluctuations spectrum show clearly a considerable change of the turbulent structure of the internal flow in comparison with the free … …American Journal of Applied Sciences, Vol. 3, Issue 1 · 31 Jan 2006 · 7,034 accessesView PDFCite
Research ArticleOpen accessIn the abstractRisk Assessment Study for Storage ExplosiveS. Saiful Azhar, M. Abdul Rahman, M. Saari et al.In Malaysia, there has been rapidly increasing usage in amount of explosives due to widely expansion in quarrying and mining industries. The explosives are usually stored in the storage where the safety precaution had given high attention. As the storage of large quantity of explosive can be hazardous to workers and nearby residents in the events of accidental denotation of … …American Journal of Applied Sciences, Vol. 3, Issue 1 · 31 Jan 2006 · 7,102 accessesView PDFCite
Research ArticleOpen accessIn the abstractEffect of Short Time Morphine Addiction on the Kidney Tissue in RatReza Malekpourafshar, Hamid ZeinalinejadOpium is an important substance that abuses and has very pharmacological and pathological effects. Morphine is the main substance of opium. In the recent study, it has been tried to identify the short effects of morphine on the kidney pathology of Rats. The randomized double blind study was designed. Twenty rats were selected and divided in two groups and maintained … …American Journal of Biochemistry and Biotechnology, Vol. 1, Issue 4 · 31 Dec 2005 · 6,403 accessesView PDFCite
Research ArticleOpen accessIn the abstractUltrasonic Study and Physical Properties of Borotellurite GlassesW.M. Daud, H. Zainul, Z.A. Talib et al.A series of glasses (TeO2)x (B2O3)1-x with x = 0.6, 0.63, 0.65, 0.70, 0.73, 0.75, 0.78 and 0.80 were synthesized by rapid quenching. Longitudinal and shear ultrasonic velocity were measured at room temperature and at 5 MHz frequency. Elastic properties, Poisson’s ratio and micro hardness have been calculated from the measured density and ultrasonic velocity at room temperature. Estimated parameters … …American Journal of Applied Sciences, Vol. 2, Issue 11 · 30 Nov 2005 · 7,912 accessesView PDFCite
Research ArticleOpen accessIn the abstractPeriodontal Disease as a Risk Factor for Coronary Artery DiseaseGholamali Najafi-Parizi, Ahmad LoriThere are many risk factors for coronary artery disease (CAD) and periodontal disease (PDD) is a controversial risk factor. The aim of this study was to show the association between CAD and PDD. A case-control study was designed. Sixty one patients that CAD was confirm in them by coronary angiography compared with sixty one patients with normal angiography. PDD was … …American Journal of Applied Sciences, Vol. 2, Issue 11 · 30 Nov 2005 · 6,922 accessesView PDFCite
Research ArticleOpen accessIn the abstractFault Detection of Computer Communication Networks Using an Expert SystemIbrahiem M.M. El Emary, Adanan I. Al RabiaThe main objective of this study was to build an expert system for assisting the network administrator in his work of management and administration of the computer communication network. Theory of operation of the proposed expert system depends on using a time series model capable of forecasting the various performance parameters as: delay, utilization and collision frequency. When the expert … …American Journal of Applied Sciences, Vol. 2, Issue 10 · 31 Oct 2005 · 7,129 accessesView PDFCite
Research ArticleOpen accessIn the abstractSpeaker Recognition Using Spectral Cross-correlation: A Fast AlgorithmZoubir HamiciThis study presents an original algorithm for computing the cross-correlation function applied for speech recognition A spectral correlation estimation algorithm based on the comparing the magnitude spectrum of the two signals is presented. The number of samples is reduced by a factor of two, after eliminating the image spectrum. A moving average filter is used to smooth the magnitude spectrum … …Journal of Computer Science, Vol. 1, Issue 2 · 19 Oct 2005 · 5,020 accessesView PDFCite