Author
Tarek Ahmed
Other affiliations: Yahoo!, Leiden University Medical Center, University of Exeter ...read more
Bio: Tarek Ahmed is an academic researcher from Assiut University. The author has contributed to research in topics: Inverter & AC power. The author has an hindex of 25, co-authored 216 publications receiving 3804 citations. Previous affiliations of Tarek Ahmed include Yahoo! & Leiden University Medical Center.
Topics: Inverter, AC power, Pulse-width modulation, Induction generator, Snubber
Papers published on a yearly basis
Papers
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Book•
15 Mar 2000
TL;DR: In this paper, the material balance equation was used to predict the type curve analysis of reservoir fluid flow in terms of the ratio of relative permeability of reservoir-fluid properties relative to rock properties.
Abstract: Fundamentals of Reservoir Fluid Behavior Reservoir-Fluid Properties Laboratory Analysis of Reservoir Fluids Fundamentals of Rock Properties Relative Permeability Concepts Fundamentals of Reservoir Fluid Flow Oil Well Performance Gas Well Performance Gas and Water Coning Water Influx Oil Recovery Mechanisms and the Material Balance Equation Predicting Oil Reservoir Performance Gas Reservoirs Principles of Waterflooding Vapor-Liquid Phase Equilibria Decline and Type Curve Analysis Index
932 citations
TL;DR: This Review will evaluate the available evidence on the pathophysiological mechanisms of restenosis and provide an overview of the various risk factors, together with the possible clinical application of this knowledge.
Abstract: Restenosis is a complex disease for which the pathophysiological mechanisms have not yet been fully elucidated, but are thought to include inflammation, proliferation, and matrix remodeling. Over the years, many predictive clinical, biological, (epi)genetic, lesion-related, and procedural risk factors for restenosis have been identified. These factors are not only useful in risk stratification of patients, they also contribute to our understanding of this condition. Furthermore, these factors provide evidence on which to base treatment tailored to the individual and aid in the development of novel therapeutic modalities. In this Review, we will evaluate the available evidence on the pathophysiological mechanisms of restenosis and provide an overview of the various risk factors, together with the possible clinical application of this knowledge.
261 citations
Book•
10 Sep 2004
TL;DR: In this paper, the authors present an approach for predicting the performance of conventional and unconventional gas reservoirs. But their approach is limited to two stages: phase 1.1 Phase 1.2 Phase 2.3 Phase 3.4 Phase 4.5 Tracys Form of the MBE 5.1.
Abstract: 1. Well Testing Analysis 1.1 Primary Reservoir Characteristics 1.2 Fluid Flow Equations 1.3 Transient Well Testing 1.4 Type Curves 1.5 Pressure Derivative Method 1.6 Interference and Pulse Tests 1.7 Injection Well Testing 2. Water Influx 2.1 Classification of Aquifers 2.2 Recognition of Natural Water Influx 2.3 Water Influx Models 3. Unconventional Gas Reservoirs 3.1 Vertical Gas Well Performance 3.2 Horizontal Gas Well Performance 3.3 Material Balance Equation for Conventional and Unconventional Gas Reservoirs 3.4 Coalbed Methane CBM 3.5 Tight Gas Reservoirs 3.6 Gas Hydrates 3.7 Shallow Gas Reservoirs 4. Performance of Oil Reservoirs 4.1 Primary Recovery Mechanisms 4.2 The Material Balance Equation 4.3 Generalized MBE 4.4 The Material Balance as an Equation of a Straight Line 4.5 Tracys Form of the MBE 5. Predicting Oil Reservoir Performance 5.1 Phase 1. Reservoir Performance Prediction Methods 5.2 Phase 2. Oil Well Performance 5.3 Phase 3. Relating Reservoir Performance to Time 6. Introduction to Oil Field Economics 6.1 Fundamentals of Economic Equivalence and Evaluation Methods 6.2 Reserves Definitions and Classifications 6.3 Accounting Principles References Index
215 citations
TL;DR: In this paper, a three-phase self-excited induction generator (SEIG) with squirrel-cage rotor is presented along with its operating performance evaluations for small-scale clean renewable and alternative energy utilizations.
Abstract: In this paper, the practical impedance approach steady-state analysis in the frequency domain for the three-phase self-excited induction generator (SEIG) with squirrel-cage rotor is presented along with its operating performance evaluations. The three-phase SEIG is driven by a variable-speed prime mover(VSPM) in addition to a constant-speed prime mover (CSPM) such as a wind turbine and a micro gas turbine for clean alternative renewable energy in rural areas. The basic steady-state characteristics of the VSPM are considered in the three-phase SEIG approximate equivalent circuit and the operating performance of the three-phase SEIG coupled with a VSPM and/or a CSPM are evaluated and discussed online under the conditions related to the speed changes of the prime mover and the electrical inductive load power variations with simple computation processing procedures. A three-phase SEIG prototype setup with a VSPM is implemented for small-scale clean renewable and alternative energy utilizations. The experimental performance results give good agreement with those obtained from the simulation results. Furthermore, a proportional-integral (PI) closed-loop feedback voltage regulation of the three-phase SEIG driven by the VSPM on the basis of the static var compensator (SVC) composed of the thyristor phase-controlled reactor in parallel with the thyristor switched capacitor and the fixed-excitation capacitor bank is designed and considered for the wind generation as a renewable power conditioner. The simulation analysis and experimental results obtained from the three-phase SEIG with SVC for its voltage regulation prove the practical effectiveness of the additional SVC with the PI-controller-based feedback loop in steady-state operation in terms of high performance with low cost.
160 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
1,370 citations
Sahlgrenska University Hospital1, National Institutes of Health2, University of Paris3, Children's Hospital Oakland Research Institute4, University of Glasgow5, Centro Nacional de Investigaciones Cardiovasculares6, Aarhus University7, Medical University of Vienna8, University of Amsterdam9, University of California, Los Angeles10, University of Western Ontario11, Monash University12, University of Copenhagen13, University of Western Australia14, Royal Perth Hospital15, French Institute of Health and Medical Research16, Oregon Health & Science University17, University of Cambridge18, University of Bristol19, Trinity College, Dublin20, University of Texas Southwestern Medical Center21, Charité22, Utrecht University23, University of the Witwatersrand24, Imperial College London25, Technische Universität München26, University of Helsinki27, University of Groningen28, Hacettepe University29, University of Milan30, Columbia University31
TL;DR: In this paper, the authors proposed a method to solve the problem of the problem: this paper ] of "uniformity" of the distribution of data points in the data set.
Abstract: Abstract
655 citations