Journal of Engineering and Sustainable Development (JEASD)

Fluid power system plays major roles in modern industry. In much heavy industrial equipment and machine (stationary and Mobil), power transfer is mainly provided by a fluid power system. Reliable operation of hydraulic system can only be ensured through proper design, effective maintenance and continuous monitoring. The rapid growth in the development and application of Information technology and artificial intelligence technology hold great potential for enabling the distributed and intelligent fault diagnosis. A knowledge based expert system will employ situation-action rules (production rules) to diagnose a failure and subsequently identify specific component or units which caused the failure. Diagnosing problems with fluid power system usually requires personnel with extensive experience or education.. Diagnosis of problems with recommendations from a computerized assistant would be highly useful. The present work develop and implement an export system (Hdro- diagnosis) for this paper describes the development and implementation of Hydro-Diagnosis, an expert system for diagnosis of Hydraulic circuit and for recommendation of corrective action.

Virtual private Network (VPN), is a technology that provides a secure communications mechanism for data and control information transmitted between networks. It can be used over existing network such as data across public network. This is often less expensive than the alternatives such as dedicated private telecommunications lines between organization or branch offices, VPN uses many protocols that work together in various combinations to provide protection for communications. IPSec is flexible enough to meet many needs, because this it’s works in network layer. But there are other protocols such as (PPP, PPTP,L2TP, ….) that provide a better solution, Cisco, the largest manufacturer of IP routers, offers VPN-IPSec implementation in its routers. The purpose of this paper is to present and explain the steps necessary to configure tunnel mode IPSec between two Cisco routers. In order to provide a thorough understanding of the configuration.

Motion detection and center computation of moving objects in time-varying images is becoming increasingly important in diverse applications. A method for motion detection and center of object computation in time sequence of images has been used in this work.Researchers have used segment and match techniques to acquire center information. This technique is sensitive to segmentation errors and the success of the algorithm is based on accurate segmentation of static frames, which is rarely satisfied in real scenes.

A firing control scheme for a three-phase fully controlled thyristor bridge dual-converter is described. By adapting the cosine wave crossing method, in the scheme, the converter operates as a linear power amplifier. The firing circuit has a fast response for triggering angle correction. The scheme requires minimum number of integrated circuit component since it utilizes the same circuit for both rectification and regeneration modes of operation. The experimental waveforms are correlated with predicted waveforms.

Several advantages have been identified in using mobile agents in distributed systems .The most frequently advantages include: reduction of network load ,decrease in communication latency, dynamic adoption and better support for mobile devices with intermittent connection .However the benefits offered have not been sufficient to simulate their wide spread deployment, the main reason is their inherent security risks. Security issues consist of protecting the agent platform and protecting the mobile agent. The toughest task is protecting the mobile agent, which is subject to attacks from the platform it is operating on. This paper introduces a protocol based on publicly verified signature chain, digital envelope and centralized Trusted Third Party (TTP) scheme that allows detection of attacks against code, state and execution flow of mobile agents.

The international demand of water increased compared to the available water resources due torecent development water resources for different uses. In many areas especially in Arabian GulfAreas, a shortage of portable water. This study deals with design a model to combine the multi effect desalination water (MED) with the steam power plant. Using the exhaust waste heat of the power plant to heat the sea water. The model has been based upon various heat and mass transfer equations. Taking in consideration all requirements of making available safe drinking water for requirement. The waste heat of the exhaust gases of power plant is captured before exhausting it to the atmosphere and transferred to salty water. The temperature of salty water rise to level 90C to130C. This is ideal temperature for desalination in multiple effect distillation MED plant. The hot salty water then passes through a flash into the evaporator then condenses on the condenser tube bank, and internal heat recovery is achieved by transferring its heat of condensation to the sea water feed that is thus being preheated.In this study selective an exist steam power plants, combine with MED to produce 1000 m3/day to15000 m3/day drinking water from salty water. desalination.

The mathematics laws, relations and functions are the guide for all the engineering designs and applications. This guide will simplified the work in the design phase but it capture the design in some times because the conditions of high accuracy in mathematics values. This accuracy not accepted any approximation in opposite side the values in the engineering fields that have small approximation in all times. This paper will propose a novel approach with its proves to replacement some complex functions with a more simplicity functions that have approximate general shape, then modified the alternative functions to approximate them values for all times, i.e. reduce the error (maximum and accumulated) between the original function and the alternative function. This paper discusses a new mathematics relation between some functions spatially the unintegralable functions such as arctan, arctanh, Gaussian and other functions. This relation will detect and prove using an engineering approach such as successive approximation in C++ programming also this paper will discuss the other derivatives for these relations if found. Finally it will give some important direct applications with some future expansions in this field.

Time and schedule management is absolutely essential for project success. Running out of time, like running out of money lead to fail the project management. In construction project, a change refers to a modification to conditions, assumptions or requirements. It can be caused by either direct or indirect factors. Different changes may have different effects or consequences. This research aims to identify the major elements of changing the specific time of project, and this research also aims to build model tree to identify the causes which lead to change the time of project. The researcher presents decision making tool by using diagnostic system developed by using (VANGUARD SOFTWARE SYSEM) to enable engineers giving an appropriate decision by using decision tree model. The vanguard system is specifically designed to perform a wide range of tasks required in business decision analysis. Vanguard combines decision _making technology with methods to create diagnostic system applications.

This paper introduces some studies on microstrip antenna (MSA) which can be used for wide or dual band communication systems. The antenna geometry presented in this paper consists of multi-resonators with stacked geometry. The antenna is characterized and designed using Microwave Office 7.5 package software produced in 2007. Some results regarding the input impedance, VSWR, bandwidth and radiation power pattern are presented in this paper.

The image compression required signed data that has a symmetric about zero to improve the efficiency of the compression. The unsigned images will convert to signed images using 1’complement (1’C) converter or 2’complement (2’C) converter. The converter (1’C or 2’C) has two problems first is the transform is not reversible because the overlap in the last two values for 1’C or the first two values for 2’C. Second it is high cost for the general converter. The proposed method is a hybrid method between 1’C and 2’C make the overlap in the middle two values, that will give a reversible conversion and it has a very low cost for the general converter.

Steganography comes from the Greek word "steganos", roughly translated to “Covered Writing”. Steganographic techniques allow one party to communicate information to another without a third party even knowing that the communication is occurring. The ways to deliver these “secret messages” is important. This paper is intended to introduce the hiding text (data) inside video as a means to communicate secret messages in away that they will not be read but by the desired person. The methods that used to hide text are the 4 Least Significant Bits (4-LSB) and Discrete Wavelet Transform (DWT), which will be hided in one color of video frames (i.e. red color).

The aim of this research is to study the ability to use solar energy for the purpose of cooling. A cooling absorption system of water-lithium bromide (LiBr/H2O) type (3 Ton) was used. This system depends on solar energy as a heat source to operate the system using solar collectors. A domestic place of (100 m2) was used to complete the study and the calculations of the system. For the implementation of the simulation of the system a mathematical model was applied, which includes the calculations of the collected energy and added energy of the auxiliary heater, the capacity of the cooling system, and the temperature of water used in different parts of the system. Also, the contribution of solar energy and collector efficiency was calculated. The system was tested during the summer months starting in May and ending by September. The system operation started at 8 o'clock AM and finished by 10 o'clock PM. The simulation of the mathematical model was implemented by the program (Fortran90). The study concludes that the application of solar collectors of an area of (60 m2) gives a contribution percentage of (70%) and this leads to a reduction in energy conception by a percentage of (70%) of the required energy to operate the system in the case of using a traditional air conditioning system during July only. As well as the determination of solar collector area per cooling ton was calculated. It was in the range of (20 m2)...

This research aims to study and analyze the thermal performance of a counter flow cooling tower with three different types of packing, Corrugated plastic sheets, perforated aluminum square channel sheets, and finally plastic balls arranged in a square matrix. The performance was analyzed theoretically and experimentally by studying the effect of temperature of the heated water entering the cooling tower with different mass flow rates of water and air for the three types of packing. The results showed that the inlet water temperature in the cooling tower has a great effect on the tower performance. As the temperature increases the performance decreases. In contrast as the airflow rate increases the tower performance increases but to a certain limit. To investigate the effect of the packing length, three lengths were chosen and a number of correlations equations representing the tower performance factor were derived a computer program was built using Engineering Equation Solver (EES) to simulate the finite difference method based on a mathematical model. The results showed that the highest tower performance was when aluminum packing was used and the lowest when plastic balls were used.