Prof. Fathi Hareb | Libyan Academy Of Graduate Studies (original) (raw)

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Papers by Prof. Fathi Hareb

This paper investigates grid-connected photovoltaic (PV) systems on rooftops as a case study, imp... more This paper investigates grid-connected photovoltaic (PV) systems on rooftops as a case study, implemented in Tripoli, Libya. A comprehensive survey encompassing plant design and detailed performance analysis is conducted to enhance understanding and optimize the operational behavior of PV systems installed on Libyan households' rooftops. The study examines two scenarios: a grid-connected PV system without a battery and a gridconnected PV system with a battery. The findings demonstrate the economic advantages of installing PV systems, including sufficient energy generation and surplus energy feeding into the grid during periods of excess production. Furthermore, the study highlights substantial environmental benefits, such as the avoidance of emissions equivalent to thousands of tons of CO2. The results aim to elucidate the benefits and challenges associated with increasing the penetration levels of PV systems in the Libyan electric network.

Micromotors.servo Technique, 2001

In this paper,the Slice-Tube Method(STM),is applied to calculate the air gap permeance for the Si... more In this paper,the Slice-Tube Method(STM),is applied to calculate the air gap permeance for the Single Phase Switched Reluctance Motor(SPSRM) with rotor at arbitrary position.The calculating results are compared with finite element method,which indicates that the STM is practically suitable for engineering purposes.

In this paper, Design Microstrip antenna integrated with solar cell which used for transmitted an... more In this paper, Design Microstrip antenna integrated with solar cell which used for transmitted and received the RF signal and generate DC voltage at same time, The antenna was printed using Perpex substrate material with dielectric constant of εr = 2.6 and thickness of h = 1.6 mm as insulation layer and use solar cell as substrate layer with εr = 3.9 and thickness 2.3 mm. The overall dimension of the antenna is 85 mm x 55 mm x 3.9 mm with 50 Ω impedance. This antenna operates between 4.9106 GHz and 5.1219 GHz for return loss of less than-10 dB. The simulation results present that the antenna gain ranges between 3.479 dBi and dBi with Directivity ranges between 4.833 and 6.574.

This paper, presents and discusses the single phase Doubly Salient Permanent Magnet (DSPM) motor.... more This paper, presents and discusses the single phase Doubly Salient Permanent Magnet (DSPM) motor. The motor has four stator poles and six rotor poles, two different air-gap lengths are arranged in the stator poles to insure self-start. The rotor parking position is in the effective torque zone of the winding. The motor has a simple and robust structure. The simulation and experimental results show that the motor can achieve a higher efficiency over a large speed range. The detailed operation principle, modeling and finite element analysis of the motor are investigated in this paper. Experimental results for prototype machine are presented.

Lightning Phenomenon is a transient, high current discharge, due to the accumulation of charges i... more Lightning Phenomenon is a transient, high current discharge, due to the accumulation of charges in clouds. This paper discusses the nature and causes of the phenomenon of lightning and Principle of lightning.

The hazardous of electric shock, comes from the miss use of electrical devices on the daily bases... more The hazardous of electric shock, comes from the miss use of electrical devices on the daily bases use like contact with bare wires for example, but electromagnetic field EMF produced in the space around electrical device as a result of current flow to operate the device in use is an invisible. The EMF danger for the common people, has effects on the surrounding environment and society as well. The modern life style rely mainly on the electricity because of the need of using facilities and accessories operated by electricity. And as a result the need to be aware of the potential health effects of electricity become a must. The communication revolution of the last two decades resulted in several research studies to shade light on the EMF hazard, which is known as a radio frequencies or non ionization pollution. This paper introduce the reader to the literature resources in the field EMF effects and hazardous as well as the description of several unusual aspects of challenging in this area. In addition the paper presents the possible health effects, and EMF hazardous concerns which may happen due to the miss use of the electrical devices such as, Mobile phone, base station, transmitters, and power transmission line. The exposure occurs due to the accumulated doses of EMF.

Abstract-The paper presents a Novel single-phase switched reluctance motor (SPSRM) with multi air... more Abstract-The paper presents a Novel single-phase switched reluctance motor (SPSRM) with multi air gap steps, in the rotor poles, and parking magnet poles arranged on the stator.
The paper focuses on the applying Tube Slice Method (TSM), to simplify the calculations of the magnetic circuit, and to insure accuracy of the SPSRM. Theoretical calculations of the permeance based on the tube system were used to obtain the lower bound of the air gap permeance, while the slice system gives the upper bound. By choosing suitable rotor position to get maximum and minimum permeance, they lead to calculate the motor performance and achieve good accuracy.
In addition to that the Max. and Min. Inductance obtained from TSM was compared with FEM software package developed for Single Phase Switched Reluctance Motor.
Selection of suitable geometrical stepped gap and arc length of the rotor pole step will lead to increase the positive variation angle of the inductance. The asymmetrical rotor helps to insure that the rotor will park in its parking position.
The SPSRM has simple magnetic circuit, low assembly cost, variable speed, and the air gap steps and parking magnet gives it capability of self-starting.

The mismanagement of the educational Institutions and the un stability of the curriculum lead to ... more The mismanagement of the educational Institutions and the un stability of the curriculum lead to the failure of these Institutions outcome.
The teachers suffers from knowledge’s and teaching skills weakness and unadequacy methodology delivering the teaching materials to the students.
This paper deals with all these requirements of the education process to achieve its goals.

In first stage of each microwave receiver there is Low Noise Amplifier (LNA) circuit, and this st... more In first stage of each microwave receiver there is Low Noise Amplifier (LNA) circuit, and this stage has important rule in minimizing the system noise figure, provide enough gain with sufficient linearity, and assure a stable 50 Ω input impedance at a low power consumption. The design of a LNA in Radio Frequency/Microwave (RF/MW) circuit requires the trade-off many importance characteristics such as gain, Noise Figure (NF), stability, power consumption and complexity. This situation Forces the designers to make choices in the design of RF circuits.
In this paper the aim is to design and simulate a LNA circuit with high gain and low noise using E-pHEMT MGA-665P8 transistor for frequency of 4 GHz. The amplifier is manually designed using conventional technique, Smith chart was used to do a matching of the input and output of the amplifier. The matching network was designed with microstrip lines and it’s single-stub with minimum lengths. A completed design of amplifier was optimized using Hewlett-Packard Advanced Design System (HP-ADS) software. A single stage LNA has successfully designed with 21.032 dB forward gain and 0.697 dB noise figure and working stably in the desired frequency.

The paper presents the Aspects Design of the Single- Phase Switched Reluctance Motor SPSRM, has a... more The paper presents the Aspects Design of the Single-
Phase Switched Reluctance Motor SPSRM, has a multi
air gap step rotor pole, two wounded poles and parking
magnet poles are arranged on the stator.
The paper focuses on the Permeance Tubes. A suitable
geometrical stepped gap rotor pole leads to increase the
inductance variation angle. The asymmetrical rotor help
to insure the rotor will park in its parking position.
The SPSRM shows that it has simple magnetic circuit,
low assembly cost, variable speed, and the air gap steps
and parking magnet gives it capability of self-starting.

Micromotors.servo Technique, 2001