Böcker av Hidaia Mahmood Alassouli

Power system protection systems have three basic components: Instrument transformers, Relays, Circuit breakersThe function of the CT is to reproduce in its secondary winding a current I' that is proportional to the primary current I. The CT converts primary currents in the kiloamp range to secondary currents in the 0-5 ampere range for convenience of measurement.The function of the relay is to discriminate between normal operation and fault conditions. The OC relay in Figure 2 has an operating coil, which is connected to the CT secondary winding, and a set of contacts. When |I'| exceeds a specified ''pickup'' value, the operating coil causes the normally open contacts to close. When the relay contacts close, the trip coil of the circuit breaker is energized, which then causes the circuit breaker to open.System-protection components have the following design criteria:¿ Reliability: Operate dependably when fault conditions occur, even after remaining idle for months or years. Failure to do so may result in costly damages.¿ Selectivity: Avoid unnecessary, false trips.¿ Speed: Operate rapidly to minimize fault duration and equipment damage. Any intentional time delays should be precise.¿ Economy: Provide maximum protection at minimum cost.¿ Simplicity: Minimize protection equipment and circuitry. Since it is impossible to satisfy all these criteria simultaneously, compromises must be made in system protection.The book consists from the following sections:1. Chapter 1: Power System Faults:2. Chapter 2: Instrument Transformers.3. Chapter 3: Overcurrent and Earth Fault Protection Relays.4. Chapter 4: Radial System Protection.5. Chapter 5: Zones of Protection.6. Chapter 6: Differential Relays.7. Chapter 7: Distance Relays.8. Chapter 8: Transformer Protection.9. Chapter 9: Generator Protection.10. Chapter 10: Busbar Protection. 11. Chapter 11: Circuit Breakers.12. Chapter 12: Fuses.13. Chapter 13: References.¿

Matlab SimPowerSystems is a modern design tool that allows scientists and engineers to rapidly and easily build models that simulate power systems. Not only can you draw the circuit topology rapidly, but your analysis of the circuit can include interactions with mechanical, thermal, control, and other disciplines. The paper covers some case studies that provide detailed, realistic examples of how to use SimPowerSystems in power system analysis. The following types of studies are covered on the paper:1. Thyristor-Based Static Var Compensator: Study the steady-state and dynamic performance of a static var compensator (SVC) on a transmission system.2. Transient Stability of a Power System with SVC and PSS: Study of the application of static var compensator (SVC) and power system stabilizers (PSS) to improve transient stability and power oscillation damping of the system. 3. GTO-Based STATCOM: Study the steady-state and dynamic performance of a static synchronous compensator (STATCOM) on a transmission system. 4. Control of load flow using UPFC: Study the steady-state and dynamic performance of a unified power flow controller (UPFC).5. Variable-frequency Induction Motor Drive: Study of a PWM inverter is used as a variable-voltage, variable-frequency source to drive an induction motor in variable-speed operation.6. Chopper-Fed DC Motor Drive: Study of a DC motor drive with armature voltage controlled by a GTO thyristor chopper.7. VSC-Based HVDC Link: Modeling of a forced-commutated voltage-sourced converter high-voltage direct current (VSC-HVDC) transmission link.

This project shows some selected signal techniques, including image and audio processing, using the Matlab digital signal processing and image processing toolboxes. The project is divided to 3 parts.The project is divided to 3 parts.Part I includes design and implementation of different types of filters for filtering signal that has different sinusoidal frequency components or noise. The comparison was made between FIR low pass flter, butterworth filter, Chebycheve Type I low pass filter and Chebycheve Type II low pass filter. Then different types of IIR Butterworth filters were designed and implemented to filter a signal that has many harmonics components, including low pass filter, high pass filter, stop band filter and band pass filter.Part II examined audio filtering in the sense of specific frequency suppression and extraction. There are many different types of filters available for the construction of filters. We will specifically use the Butterworth filter. An audio signal was read and different types of filters, including low pass filter, high pass filter, stop band filter and band pass filter, were designed and implemented in order to filter the audio signal from some frequency bands. Then the discrete cosine transform compression examined on the audio signal at different compression rates.Part III deals with image processing; the project shows examples in smoothing, sharpening, and edge detection. Other useful operations on the image were tested, including image cropping, image resizing, image, histogram equalization and altering image brightness

This is Arabic book that talks about Palestine and Israel History. يسرد كتابي هذا تسلسل لمعظم إحداث تاريخ فلسطين القديم والحديث حتى اليوم. يشمل هذا الكتاب الفصول التالية الفصل الاول قدسيه فلسطين في الاسلام. الفصل الثاني تاريخ فلسطين قبل الاسلام. الفصل الثالث تاريخ فلسطين في عهد الاسلام قبل قيام الدولة الفاطمية. الفصل الرابع تاريخ فلسطين في عهد الدولة الاخشيديه وعهد الدولة الفاطمية. الفصل الخامس تاريخ فلسطين لدى قيام الحملات الصليبية واحتلال الصليبيين للقدس. الفصل السادس نهضه الحركة الجهادية بقياده نور الدين الزنكي وتحرير القدس من الصليبيين بقياده صلاح الدين الايوبي. الفصل السابع حروب صلاح الدين الايوبي مع الصليبيين وتحريره بيت المقدس. الفصل الثامن ضعف الايوبيين بعد موت صلاح الدين الايوبي. الفصل التاسع يسرد هذا الفصل تاريخ فلسطين خلال الحكم المملوك. الفصل العاشر يسرد هذا الفصل تاريخ فلسطين خلال الحكم العثماني. الفصل الحادي عشر تاريخ فلسطين خلال الانتداب البريطاني في فلسطين. الفصل الثاني عشر يسرد هذا الفصل ابرز الاحداث ما بعد انتهاء الانتداب البريطاني في فلسطين حتى نكبة عام 1967 م. الفصل الثالث عشر تاريخ فلسطين ما بعد نكبة عام 1967م حتى قيام الانتفاضة الاولى. الفصل الرابع عشر تاريخ فلسطين ما بعد قيام الانتفاضة الاولى حتى وفاة الرئيس عرفات. الفصل الخامس عشر تاريخ فلسطين بعد وفاة الرئيس عرفات. الفصل السادس عشر نبذه عن معتقدات اليهود وتحريفاتهم بالتوراة ونظامهم السياسي وأحزابهم السياسية وتطلعاتهم. الفصل السابع عشر نبذه عن الكاتبه هذا مع العلم انني اعود بالفضل لا شرطه الدكتور طارق السويدان حول تاريخ فلسطين القديم والحديث في اعداد هذا الملخص.

Current-limiting fuses are widely used to protect the thyristors in dc drive systems. In the event of the commutation failure when regenerating (inverting), the fuses need to interrupt in loop supplied by the ac and dc voltages acting in series which is the most difficult case for protection by fuse.In this paper, a detailed study of the complete interruption process has been investigated by modeling of arcing process of the fuse. The effect varying the motor time constant, supply impedance, number of fuses used to clear the fault and dc machine rating to the total response for fuses protecting against the regenerative circuit internal commutation fault has been studied. The model of 200A fuse is employed in this study and fuses in series with the semiconductor devices (F1) and fuses in ac line (F2) are both considered.

The objective of this work is to develop a Word Press Online Store with Different Ecommerce Plugins and Themes and Word Press Online Magazine with MH Magazine ThemeThe work consists of three parts:i. Part I: Building Personal Website with online shop to sell E-books: The objective of this part is to develop an Ecommerce word press website with all commonly used Plug-ins.ii. Part II: Building Ecommerce website with mystyle theme and WooCommerce pluginThe objective of this part is to develop an Ecommerce website with mystyle theme and WooCommerce plugin and other commonly used Plug-ins.iii. Part III: Building Online magazine website with MH-Magazine themeThe objective of this part is to develop an online magazine website with MH Magazine theme and other commonly used Plug-ins.

Cloud Platforms provide VM images in the Linux OS as well. Linux has always been operated via terminal or shell through a keyboard and a terminal. Even with GUIs around, Linux continues to be operated from the shell.Linux VMs are also operated from the command line of your desktop via an SSH (secure shell) connection. They do not have a desktop environment or GUI installed by default. For Windows users migrating to Linux, a desktop environment would be more convenient to operate. Hence, various desktop environments can be set up on a Linux VM.Mostly we need to have Graphical User Interface GUI on the Linux Virtual Machine instance and to use Internet browser on it.This report will talk about the steps to install minimum required User Interface on VM (virtual machine) with Web Browser. We will work on installing a desktop environment on a Linux Virtual Machine on different Cloud Platforms. The book consists from the following sections:1. Generating SSH key for auto log in to Linux server.2. Creating Google Cloud Linux Virtual Machine.3. Logon to the Linux Virtual Machine4. Installing VNC server.5. Installing XRDP server.6. Installing a Graphical User Interface (GUI) for Linux Google Cloud instance and connecting to the server through VNC or RDP connection.7. Quick guide to create a Linux virtual machine in Cloudsigma.8. Quick guide to create a Linux Virtual Machine in the Microsoft Azure portal.9. Quick guide to create a Linux Virtual Machine in Amazon AWS.¿¿

configured the Postfix mail server to support Anti-Spam and Anti-Virus, using two methods.¿ Method 1: With Postfix, SpamAssassin, ClamAV and Amavis-new¿ Method 2: With Postfix, SpamAssassin, ClamAV and ProcmailThe report includes the following sections1. How Postfix receives mail:2. How Postfix delivers mail3. Starting guide for quick Postfix configuration4. Postfix mail server and Dovecot configuration5. Installing ClamAV and SpamAssassin6. Installing and configuring Squirrelmail:7. Method 1 to support Antivirus and Antispam: Using Postfix, Amavis-new, ClamAV, SpamAssassin8. Method 2 to support Antivirus and Antispam: Using Postfix, Procmail, ClamAV, SpamAssassin

Power Quality can be defined as the characteristics of the electricity at a given point on an electrical system, evaluated against a set of reference technical parameters. These parameters might relate to the compatibility between electricity supplied on a network and the loads connected to that network.The voltage waveform is normally distorted, and we have the so called Power Quality disturbances such as; voltage dips/swells, transients, harmonics and voltage unbalance amongst others. The study of Power Quality encompasses the Power Quality disturbances, as well as Power Quality standards, and Power Quality Monitoring.This project will tackle the subject of Power Quality, Power Quality Disturbances, Power Quality Standards as well as Power Quality Monitoring. A general description of each of the disturbances will be given, and the basic techniques which are used to mitigate that disturbance so as to improve the quality of the supply are presented.The book consists from the following parts:1. Abstract2. Chapter 1 Introduction3. Chapter 2 Literature Review On Power quality Disturbances 4. Chapter 3- Power Quality Standards 5. Chapter 4 Power Quality Monitoring6. Chapter 5- Results and Discussion of Results7. Chapter 6- Conclusion, Recommendations and Future Work8. References9. Appendices

This work is a step-by-step "how to" guide for configuring Samba file server, Quota andscheduled backup of important files. The paper provides an installation guide for,1. Samba server.2. Quota.3. Scheduled backup of important files.

Zoom is a video telephony software program developed by Zoom Video Communications. Zoom is a free (plus paid-for options) video conferencing tool that can be used on PCs, Macs and mobile devices. The free plan provides a video chatting service that allows up to 100 participants concurrently, with a 40-minute time restriction, and there are lots of features to support collaborative working.In this report, I'll just give quick guide on how to sign up and use the Zoom application. The report contains the following sections:1. Downloading and installing the Zoom application.2. Starting new immediate meeting.3. Joining a meeting.4. Scheduling a meeting.

It is common these days for a single system to host many domains, for example uniswa. com and mtn. com or acme. com may run on a single host machine, but behave as if they were on three different hosts. A system usually has a canonical domain, it has its usual or local domain name, and additional domains are configured as virtual domains. The purpose behind this work is to create a mail server solution based on Postfix that is based on virtual users and domains, i. e. users and domains that are in a MySQL database. The goal is to have completely virtual users and domains. This means creating a separate name spaces for reach domain.It will also demonstrate the installation and configuration of Courier-Imap (IMAP/POP3), so it can authenticate against the same MySQL database Postfix uses. The resulting postfix server is capable of quota which is not built into Postfix by default; the project will demonstrate how to patch postfix appropriately. Passwords are stored in encrypted form in the database. The work also covers the installation of Mail Scanner, SpamAssassin and ClamAv so that emails will be scanned for spams and viruses. The administration of MySQL database can be done through a web based tool Postfixadmin or can be done manually in the MySQL shell. Postfixadmin is a web based management tool created for Postfix that handles Postfix style virtual domains and users that are stored in MySQL. The squirrelmail web based email client is installed.