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Search Results: 1 - 10 of 329706 matches for " V.C. Veera Reddy "
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Modeling and Simulation of PWM Switched Autotransformer for Voltage Sag Mitigation Using MATLAB
T. Devaraju,V.C. Veera Reddy,M. Vijaya Kumar
International Journal of Electrical and Power Engineering , 2012, DOI: 10.3923/ijepe.2010.164.168
Abstract: This study addresses the modeling and simulation of a new voltage sag mitigation technique is presented besides custom power devices like dynamic voltage restorer and STATCOM are normally employed as a solution for mitigation of voltage sag and swell. In this study, modeling and analysis of PWM switched autotransformer that can compensate during voltage sag and swell condition is discussed. The proposed system has less number of switching devices and has good compensating capability in comparison to commonly used compensators. Simulation analysis of three-phase compensator is performed in MATLAB/SIMULINK and performance analysis of the system is presented for various levels of sag and swell. Also, the compensator can maintain the load powers both real and reactive powers constant. Simulation results are presented for various conditions of sag and swell disturbances in the supply voltage to show the performance of the new mitigation technique.
A NOVEL EFFICIENT SOFT SWITCHED TWO PORTS DC-DC BOOST CONVERTER WITH OPEN LOOP AND CLOSED LOOP CONTROL
T.NageswaraRao,V.C. Veera Reddy
Indian Journal of Computer Science and Engineering , 2012,
Abstract: A multiport converter promises cost-effective, flexible and more efficient energy processing by utilizing only a single power stage. Multiport converters, a promising concept for alternative energy systems, have attracted increasing research interest recently. Zero Voltage Switching (ZVS) alleviates the switching losses and improves the converter overall efficiency. Zero voltage switching can be achieved with the help of coupled inductor which also regulates the input current during the load disturbances. To reduce the switching losses and henceforth to improve efficiency of converter system, Zero Voltage Switching (ZVS) is employed. . This paper presents a two output ports single stage boost converter with ZVS. The proposed multi output port converter with soft switching is simple and efficient. The analysis is carried out for open loop and closed loop control. The simulation results for the same are presented in this paper.
Role of custom power devices in Power Quality Enhancement: A Review
T.Devaraju,,Dr. V.C.Veera Reddy,Dr. M. Vijaya Kumar
International Journal of Engineering Science and Technology , 2010,
Abstract: Electrical Power quality is the degree of any deviation from the nominal values of the voltage magnitude and frequency. From the customer perspective, a power quality problem is defined as any power problem manifested in voltage, current, or frequency deviations that result in power failure or disoperation of customer of equipment. Thispaper presents the configurations, working and significant functions of each custom power device are discussed. The present researchers are concentrating on the new technologies utilizing power electronics based concepts because these devices are capable of mitigating several power quality problems. The application of power electronics to power distribution system for the benefit of a customer or group of customers is called custom power. The custom power devices like Distribution Static compensator (DSTATCOM), the Dynamic voltage restorer (DVR) and Unified power quality conditioner (UPQC) are discussed. Comprehensive results are presented to asses the workingof each device as a potential custom power solution.
Predictors of major neurological improvement after intravenous thrombolysis in acute ischemic stroke: A hospital-based study from south India
Boddu Demudu,Srinivasarao Bandaru V.C.S,Reddy Prasad,Madhusudan M
Neurology India , 2010,
Abstract: Background : Despite the increasing use of recombinant tissue plasminogen activator (rt-PA) in acute ischemic stroke, uncertainty persists about the short- and long-term outcome of the thrombolysed patients. Objective : To identify predictors of major neurological improvement at 24 h after intravenous rt-PA administration in patients of acute ischemic stroke and their relationship with outcome at 12 months. Materials and Methods : We analyzed the data of the patients with acute ischemic stroke treated as per the National Institute of Neurological Disorders and Stroke (NINDS) criteria with intravenous rt-PA between January 2000 and June 2009 at a tertiary care center in south India. Major neurological improvement was defined by an 8-point improvement in National Institute of Health Stroke Scale (NIHSS) score or an NIHSS score of 0 or 1 at 24 h. Good outcome was defined as a 12-month modified Rankin Scale (mRS) of 0 to 1. Results : Of the 72 patients with acute ischemic stroke treated with intravenous rt-PA, 23 (32%) patients had major neurological improvement at 24 h. Age <60 years (OR 1.9, 95% CI 1.7 to3.2), admission glucose levels <8 mmol/L (OR 3.87, 95% CI 1.9 to 9.2) and mild to moderate baseline stroke severity (NIHSS median score 10+ 6) were associated with major neurological improvement after adjusting for co variables. Major neurological improvement at 24 h was an independent predictor of good outcome (mRS=1) at 12 months (OR 13.9, 95% CI 6.84 to 40.2). Conclusions : Age <60 years, glucose levels <8 mmol/L and mild to moderate stroke severity (NIHSS median score 10±6) was associated with major neurological improvement after intravenous rt-PA. Major neurological improvement at 24 h after the administration of intravenous thrombolysis independently predicted good outcome at 12 months.
A determina??o do nitrato em extratos de planta e de solos pelo método de absor??o no ultra-violeta
Bittencourt, V.C.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1969, DOI: 10.1590/S0071-12761969000100005
Abstract: nitrate in soils and plants can be determined by the method of ultraviolet absorption of nitrowyl chloride. the extracts of plants need to be treated with hydrogen peroxide before the determination in order to exidize the organic matter. for the soil extracts the blank is obtained by eliminating nitrates with hydrazine sulfate wich server to correct the absorption of the soil solutions. the determination is carried on adding perchloric, sulfuric and hudrochloric acids to the solutions obtained from vegetable and soil materials to form nitrowyl chloride. the absorbances of solutions are read at 230 miliraicrons.
the Mq-scf quantum approach of the p-azoxyanisole (PPa) molecule i. quantum energetic molecular characteristics
V.C. Scridonesi
Analele Universitatii Bucuresti : Chimie , 2005,
Abstract: For the first time in the literature of the liquid crystals (LC) a molecule LC type (pazoxyanisole(PPA)) is approached by means of the nonrelativistic molecular quantummechanics. The structural complexity of the quantum molecular system (33 nuclei, 196electrons) imposes a MO-SCF-LCAO/CNDO quantum approach, having at its basis the Hartree-Fock-Roothaan equations with LCAO expansion of the molecular orbitals (MO) and with PPPparameters of the approximation used. The quantum computations have been performed in theCNDO-2 approximation, using a computing program of MO-SCF type. For the PAA moleculethe following quantum energetic characteristics have been obtained: the orbital energies, the totalelectronic energy, the total molecular energy, the bonding energy, the ionization potential, thereduction potential (or the affinity of electrons) and the width of the forbidden interorbital zone.The quantum results related in this paper are interpreted and discussed for the PAA molecule ofthe nematic LC class.
THE THIRD WORLD WAR : AUGUST 1985
V.C. Muller
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/10-4-696
Abstract: This scenario of the Third World War depicts the events leading to the war, the conflict itself, and the aftermath. Purporting to be a history, complete with appendices, maps and index, of a war recently ended, the overall tone of the book gives the impression that it might have been derived from one or more war games.
Warning and Response
V.C. Muller
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/11-2-660
Abstract: Julian Critchley is the Conservative MP for Aldershot. Although the subtitle of the book reads: 'A study of surprise attack in the 20th century and an analysis of its lessons for the future,' and although the author illustrates his thesis by citing examples of surprise attack in the various wars since 1939, the essence of this work is concern for the Central European front of NATO. For years, NATO'S plans have been based on the assumption that there would be a period of warning resulting from the deterioration of the international situation and overt activity on the part of the Warsaw Pact forces. Critchley examines the ability of NATO to predict and to respond to the Soviet - Warsaw Pact threat; he believes that NATO's defence must be credible without reliance upon warning, that warning signs are invariably misinterpreted, disbelieved and filtered by the preconceptions of the politicians. Not even the ability to read the enemy's codes is a guarantee of learning his intentions. He concludes that the warning of attack is bound to be ambiguous and suggests that in order to prevent war NATO must restore tactical nuclear deterrence in Europe.
AMERICAN CAESAR: Douglas MacArthur, 1880-1964
V.C. Muller
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/10-2-712
Abstract: The narrative begins on a hilltop in Tennessee in 1863. It is Missionary Ridge where 18-year-old Lt Arthur MacArthur, the father of Douglas MacArthur, won the Medal of Honour. Arthur, who later became a Lieutenant General, was the driving spirit behind Douglas throughout his career.
Patton's Third Army at war
V.C. Muller
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/11-2-661
Abstract: In a series of accounts written by the men who 'were there', the reader follows General George S. Patton and his Third Army through the North West European campaign of 1944 and 1945.
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