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Full-Text Articles in Engineering

Algorithme D’Elaboration D’Un Reseau Electrique A Gestion Optimale D’Ecoulement Des Puissances, Tarek Mesbah Dec 2007

Algorithme D’Elaboration D’Un Reseau Electrique A Gestion Optimale D’Ecoulement Des Puissances, Tarek Mesbah

Boukhemis Chetate

Un des baromètres (indicateurs du niveau d’évolution ) de développement d’un pays, est sa consommation en énergie électrique ; dont tout industrie et mode de vie des résidents en dépend. Partant sur ce point capital nous avons organisé la thèse afin de gérer le parc énergétique national d’une manière rationnelle. Cette étude peut servir dans la compréhension et l’analyse approfondie de l’état de la stabilité de notre réseau électrique, qui a montré sa fragilité après l’incident vécu le 03/02/2003, qui a prouvé l’urgence de prendre en charge toutes les insuffisances enregistrées pour éviter que cet incident se reproduise. La thèse …


Trends In Uspto Office Actions, Ron D. Katznelson Nov 2007

Trends In Uspto Office Actions, Ron D. Katznelson

Ron D. Katznelson

No abstract provided.


Direct Torque Control Of Five-Phase Permanent Magnet Synchronous Machine, Mukhtar Ahmad Oct 2007

Direct Torque Control Of Five-Phase Permanent Magnet Synchronous Machine, Mukhtar Ahmad

Mukhtar Ahmad

Permanent magnet synchronous machines are becoming attractive in many industrial applications due to their high torque to inertia ratio, higher efficiency , and power density . Interest in Multi-phase motor drives has considerably increased during last few years. The main applications of multi-phase machines are in electric traction, electric vehicles, and hybrid vehicles. Multi-phase motor drives have many advantages including higher reliability and power density, and lower torque pulsations at higher frequencies


Influence Of Overvoltages In Induction Motors Fed By Pwm Voltage Inverters On Power Efficiency, Boukhemis Chetate, Mohammed Tahar Belassel, Rachid Beguenane, Stéphane Simard Oct 2007

Influence Of Overvoltages In Induction Motors Fed By Pwm Voltage Inverters On Power Efficiency, Boukhemis Chetate, Mohammed Tahar Belassel, Rachid Beguenane, Stéphane Simard

Boukhemis Chetate

No abstract provided.


Electric Power: Cyber And Electromagnetic Security Issues, George H. Baker Oct 2007

Electric Power: Cyber And Electromagnetic Security Issues, George H. Baker

George H Baker

Electric power is essential to the functioning of U.S. society. The electric power system increasingly operates at or near its reliability limits. The geographic scale of the tightly coupled networks involved makes the system susceptible to large-scale outages. More frequent natural and accidental failures portend possible catastrophes from intentional disruption. Deregulation has been a major factor to the lack of investment in system upgrades. Techniques to prevent attacks and reduce vulnerabilities are available and affordable.


Continuous Improvement In Engineering Education Through Effective Value For Money Audits, Razimah Abdullah, Rozeha A Rashid, Mazlina Esa, Sadruddin Mohd Saidfudin Apr 2007

Continuous Improvement In Engineering Education Through Effective Value For Money Audits, Razimah Abdullah, Rozeha A Rashid, Mazlina Esa, Sadruddin Mohd Saidfudin

Razimah Abdullah

Quality systems audit is classified as Value for Money audit. Faculty of Electrical Engineering, Universiti Teknologi Malaysia (FKE) Skudai subscribed to ISO 9001:2000 Quality Management System (QMS) since 2004. Effective internal audit is required to be carried out at planned intervals to determine whether the teaching-learning process is effectively implemented and maintained. This paper describes the use of Plan-Execute-Report-Monitor (PERM) model to ensure the effectiveness of such audits. It has been observed that the attrition rate among engineering students is higher during the first three years of five years undergraduate electrical engineering program. Initiatives taken to improve the teaching-learning process …


Elaboration D’Un Système Intelligent De Diagnostic Et De Surveillance En Temps Réel Des Moteurs À Induction, Djalal Eddine Khodja Mar 2007

Elaboration D’Un Système Intelligent De Diagnostic Et De Surveillance En Temps Réel Des Moteurs À Induction, Djalal Eddine Khodja

Boukhemis Chetate

No abstract provided.


Emp: A National-Scale Threat To The U.S. Infrastructure, George H. Baker Mar 2007

Emp: A National-Scale Threat To The U.S. Infrastructure, George H. Baker

George H Baker

Since the nuclear weapon atmospheric test days of the 1950s, it has been known that a single nuclear weapon detonated at altitudes from about 30-500 kilometers generates a strong electromagnetic pulse (EMP) that can disrupt electronic systems on the ground at large distances. During the Cold War, the effects of high altitude nuclear detonations were considered by many to be ephemeral, second order effects in comparison to direct blast/thermal/radiation effects from near-surface bursts in the context of mutually-assured-destruction (or MAD) scenarios. However, as infrastructure objectives have gained prominence in military operations, the likelihood of high altitude nuclear scenarios have gained …


New Technique Of One And Simultaneous Two Open-Switches Fault Automation Detection And Location In Two Level Three Voltage Inverter, Tarak Benslimane, Boukhemis Chetate Feb 2007

New Technique Of One And Simultaneous Two Open-Switches Fault Automation Detection And Location In Two Level Three Voltage Inverter, Tarak Benslimane, Boukhemis Chetate

Boukhemis Chetate

No abstract provided.


Optimisation Des Régimes De Fonctionnement D'Un Moteur Asynchrone À Cage Entrainant Une Charge Variable, Malika Louanchi Dec 2006

Optimisation Des Régimes De Fonctionnement D'Un Moteur Asynchrone À Cage Entrainant Une Charge Variable, Malika Louanchi

Boukhemis Chetate

L’objectif de ce travail est l’optimisation du régime de fonctionnement des moteurs asynchrones lorsqu’ils sont sou chargés en minimisant le courant statorique absorbé en régime établit. La minimisation du courant statorique est obtenue en faisant varier la tension d’alimentation. Nous avons initialement procédé à la description et à la modélisation du moteur asynchrone, et à partir d’un schéma équivalent du moteur nous avons établit la relation liant le courant statorique minimal à la tension qui lui correspond. Pour la variation de la tension d’alimentation nous avons opté pour un gradateur triphasé à thyristors et pour un onduleur de tension à …


On-Chip Implementation Of High Speed And High Resolution Pipeline Radix 2 Fft Algorithm, Rozita Teymourzadeh, Masuri Othman Dec 2006

On-Chip Implementation Of High Speed And High Resolution Pipeline Radix 2 Fft Algorithm, Rozita Teymourzadeh, Masuri Othman

Dr. Rozita Teymourzadeh, CEng.

A new on-chip implementation of Fast Fourier Transform (FFT) based on Radix 2 is presented. The pipeline and parallel approaches are combined to introduce a new high speed FFT algorithm which increases resolution by using floating point calculations in its structures. The design has the merits of low complexity and high speed performance. Furthermore, latency reduction is an important issue to implement the high speed FFT on FPGA. The proposed FFT algorithm shows the latency of (N/2 log(2) N) + 11. Moreover, this algorithm has the advantage of low mean squared error (MSE) of 0.0001 which is preferable to Radix …


Vlsi Implementation Of High Speed And High Resolution Fft Algorithm Based On Radix 2 For Dsp Application, Nooshin Mahdavi, Rozita Teymourzadeh, Masuri Othman Dec 2006

Vlsi Implementation Of High Speed And High Resolution Fft Algorithm Based On Radix 2 For Dsp Application, Nooshin Mahdavi, Rozita Teymourzadeh, Masuri Othman

Dr. Rozita Teymourzadeh, CEng.

Using Fast Fourier Transform (FFT) is indispensable in most signal processing applications. Designing an appropriate algorithm for the implementation of FFT can be efficacious in digital signal processing. Sophisticated techniques such as pipelining and parallel calculations have potential impacts on VLSI implementation of FFT algorithm. Furthermore, a mathematic approach such as floating point calculation achieves higher precision. In this paper, an efficient algorithm with using parallel and pipelining methods is proposed to implement high speed and high resolution FFT algorithm. Latency reduction is an important issue to implement the high speed FFT on FPGA. The Proposed FFT algorithm shows the …


A Novel Quasi-Resonant Snubber-Assisted Zcs-Pwm Dc-Dc Converter With High Frequency Link, Khairy F. A. Sayed Dr Dec 2006

A Novel Quasi-Resonant Snubber-Assisted Zcs-Pwm Dc-Dc Converter With High Frequency Link, Khairy F. A. Sayed Dr

Khairy F. A. Sayed Dr

In this paper, a novel type of auxiliary switched capacitor assisted edge resonant soft switching PWM resonant DC-DC Converter with two simple auxiliary commutation lossless inductor snubbers. The operation principle of this converter is described using the switching mode equivalent circuits. This newly developed multi resonant DC-DC Converter can regulate its dc output AC power under a principle of constant frequency edge-resonant soft switching commutation by asymmetrical PWM duty cycle control scheme. The high frequency power regulation and actual power characteristics of the proposed soft switching PWM resonant DC-DC Converter are evaluated and discussed. The operating performances of the newly …