Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901EFFECT OF SOME ADMIXTURES ON HEAT OF HYDRATION REACTION OF CEMENT PASTES PRODUCED IN YEMEN, SAUDI ARABIA, AND EGYPT.1041104812785410.21608/jesaun.2009.127854ENFatima A. Al-QadriAssociate Professor, Department of Chemistry, University of Sana'a Yemen.A. M. SaadAssociate Professor, Department of Chemistry, University of Sana'a, YemenAffaf Ahmed AldlaeeGraduated student , Department of Chemistry, University of Sana'a, Yemen.Journal Article20090712Blended cement pastes were prepared with and without silica fume and fly ash using an initial water/cement ratio of 0.40. Effect of these two mineral admixtures (silica fume, and fly ash) on the heat evolution of hydration reactions of Portland cement produced in Yemen, Egypt and Saudi Arabia has been studied at various hydration times. The heat of hydration of OPC in the presence of admixtures was studied, by using calorimetric method. The results show that the heat of hydration of Portland cement is retarded in the presence of both the admixturesAssiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901METHODOLOGY OF PLANNING DOMESTIC SEWAGE SYSTEM IN SLUMS & RURAL AREAS BY ECONOMIC WAY1049106212785910.21608/jesaun.2009.127859ENEzzat Abd ElshafyProf . of Sanitary and Environmental Engineering Faculty of engineering
Cairo UniversityM. Reda HaggagProf .of Planning environment & infrastructure Faculty of Urban&
Regional planning Cairo UniversityA. Saad AbousreaSenior eng in water& sewage department in General organization for
Physical planningJournal Article20090716Slums and rural areas became one of the most serious problems which face Egyptian society whereas 75% from Egypt' population live in Egyptian countryside, and 20% in slums (human development report), less than 5% only from Egyptian countryside with sanitary sewage service (CAPMAS). The problem has economic, physical, strategic, social and environmental dimensions, legislations and laws. The paper aims to provide immediate flexible system' suggestion to adhere to those dimensions. It took successful international and local experiments related to the problem. It took a village as case study; it took samples from desludging truck in the village and analyzed it. Analyzing results and comparing it with the results of analyzing at the influent of traditional WWTP (ZENIN). The study ended into proposing Simi non-pipe system which consisting of main collector to receive discharge from trucks as an immediate stage and then treatment plant working with anaerobic system (UASB/USBR) it will followed by aerobic-system later and final disposal dumping into drain.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901LEVEL OF SEISMIC PROTECTION IN DIFFERENT EDITTIONS OF THE EGYPTIAN CODE OF LOADS1063107912786010.21608/jesaun.2009.127860ENWaleed Abo El-Wafa MohamedLecturer, Civil Engineering Department, Faculty of Engineering, Assiut
University, Assiut, Egypt.Journal Article20090806The last edition of the Egyptian Code of Loads (ECOL) was released by the end of year 2008. The seismic provisions in this edition are almost completely different compared with those in the 1993 edition while some specific changes are presented relative to the 2003 edition. The major significant changes in the seismic provisions revealed in the different editions are reviewed. The effect of the variation in these provisions between the different editions of the ECOL on the level of seismic protection presented by the code calculated base shear is analyzed and discussed. The analyzed provisions include seismic zones and mapping, period equations, soil site conditions, building importance factor, and ductility level. These provisions are applied to two types of structures which are moment resisting frames (MRF) and dual system consists of shear wall-moment resisting frames (SW-MRF). The considered height of buildings covers almost all code permitted range of heights. It is found that the provisions in the 1993 edition yield base shear much less than the values obtained using 2008 edition especially for low to medium height buildings located in medium and high seismic zones.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901INVESTIGATION ON DIFFERENT LATERAL EARTHQUAKE FORCE METHODS OF ANALYSIS1081109712786110.21608/jesaun.2009.127861ENWaleed Abo El-Wafa MohamedLecturer, Civil Engineering Department, Faculty of Engineering, Assiut
University, Assiut, Egypt.Journal Article20090806In the concept of lateral seismic design there are three famous analysis methods. These methods include the equivalent static load (ESL), modal response spectrum (MRS) and time history analysis (THA). In this study, the variation in the resulted base shear using any of these methods is investigated. The modal response spectrum analysis, either simplified (same as ESL) or multiple, is carried out using the elastic design spectrum specified by the renewed Egyptian Code of Loads (2008 ECOL). The time history analysis is applied using seven delibrate different real earthquake excitations selected to match the specified elastic spectrum and soil type. Suggestions to rationally enhance the seismic protection level obtained from the multiple response spectrum is presented and emphasized. This study extends to analyze and compare our resulted base shear with those obtained from different international codes as the European, American and Canadian codes for sites with similar conditions. Special emphasis is paid to evaluate the ECOL response modification factors compared with the considered codes. It is found that there is high variation between the base shear obtained using the code specified different analysis methods and in comparison with the considered codes and hence some seismic provisions in the new 2008 ECOL need to be recontemplated.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901SECURE ACTIVE ROUTING FOR PEER-TO-PEER NETWORKS1099110812816910.21608/jesaun.2009.128169ENHanafy M. AliComputers and Systems Engineering Dept. - Minia UniversityMohamed Z. AbdelmegidComputers and Systems Engineering Dept. - Al- Azhar UniversityMohamed M. AliComputers and Systems Engineering Dept. - Minia UniversityJournal Article20090111This paper provides a single-node peer-to-peer (P2P) network architecture that integrates both active routing and P2P networking. The integrated architecture, as such is not full secure. Therefore, two security layers are added, one to compute the node reputation and the second to provide an authentication scheme. Such scheme may be either central or hierarchical. The integrated architecture gives us good results as the choice of the more trust bath is based on the reputation values of end nodesAssiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901SPEED-SENSORLESS VECTOR CONTROLLED INDUCTION MOTOR DRIVE TAKING SATURATION INTO ACCOUNT1109112412817010.21608/jesaun.2009.128170ENA. M. El-SawyElectrical Engineering Department, Faculty of Engineering,
El-Minia University, EL-Minia, Egypt.Yehia S. MohamedElectrical Engineering Department, Faculty of Engineering,
El-Minia University, EL-Minia, EgyptA. A. ZakiElectrical Engineering Department, Faculty of Engineering,
El-Minia University, EL-Minia, Egypt.Journal Article20090404This paper aims to develop a speed sensorless indirect vector controlled induction motor drive taking the effect of magnetic flux saturation into account. A mathematical dynamic model of an induction motor as influenced by magnetic circuit saturation is presented. Moreover, a modified structure of indirect vector controller scheme is proposed which involves the saturated value of the magnetizing scheme. In this scheme, an effective method for rotor speed estimation is based on a modified model reference adaptive system (MRAS) to achieve high-precise control in a wide range of motor speed. The online magnetizing inductance estimation algorithm is used to modify the value of the magnetizing inductance which is used in the motor speed estimator. Digital simulations have been carried out in order to evaluate the effectiveness of the proposed sensorless drive system. The results have proven excellent steady-state and dynamic performances of the drive system, which confirms the validity of the proposed scheme.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901MULTI-WIDEBAND COMPACT PATCH ANTENNA WITH SEVEN-SEGMENT SLOTS1125113412817110.21608/jesaun.2009.128171ENElsayed Esam M. KhaledElec. Eng. Dept., Assiut University, Assiut, EgyptJournal Article20090528A small size multi-wideband patch antenna with seven-segment slots is presented. The multi-wideband operation and size reduction are manipulated through the use of the slot loading technique. Etching sevensegment slots into the conventional patch antenna enhances its performance for multi-wideband applications. The geometry that is constructed by the slots controls the resonance frequencies and their bandwidths, of the antenna. The software IE3D is employed to analyze and simulate the proposed antenna. Some of the results are confirmed using the HFSS software. The results illustrate that the proposed antenna is capable to achieve return loss (RL) less than -10 dB and voltage standing wave ratio (VSWR) < 2 in up to eight frequency bands, in the frequency range 2 - 8 GHz.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901A NEW SETTING PROTOCOL FOR DISTANCE RELAY PROTECTION SYSTEMS IN TRANSPOSED TRANSMISSION LINES WITH UNSYMMETRICAL IMPEDANCES1135114412817310.21608/jesaun.2009.128173ENAbou-Hashema M. El-SayedMinia University, EgyptJournal Article20090706This paper aims to overcome the effect of transposed transmission lines with unsymmetrical impedances on protection systems. Transposition of phases can successfully overcome the problem of unsymmetrical impedances at the end of the line, but fails at the other parts of the line. The effect of this problem appears in the distance measured by the distance relay unit; the measured distance is usually not equal to the actual distance to the fault location. Moreover, this measured distance (measured impedance) has different values at the same fault location according to the fault loop for both the same and different fault types. Experiments have been carried out to study the effect of the unsymmetrical impedances on the operation of the system protecting against each fault type. The fault types under study are single line-toground, line-to-line and three-phase faults. The fault clearing time, the distance measured by the distance relay unit and the error in this measured distance were determined. A new setting rule is suggested in order to prevent failure of the distance relay caused by unsymmetrical impedancesAssiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901DESIGN AND SIMULATION OF MARINE AND TIDAL CURRENT CONVERTERS USING DC-DC BOOST CONVERTER1145115512817410.21608/jesaun.2009.128174ENAbou-Hashema M. El-SayedMinia University, Egypt
Interdisciplinary graduate school of Engineering Sciences, Kyushu
University, JapanEmad El-BakouryInterdisciplinary graduate school of Engineering Sciences, Kyushu
University, JapanJournal Article20090706Due to highly demand on the renewable energy sources as a free and a clean power resource, extracting energy from unsteady flow using marine and tidal current turbines has a special focusing nowadays. For their resource characteristic, extracting energy from them needs more simple and robust converter in order to avoid the drawbacks of the mechanical system such as gearbox and makes the marine/tidal current energy more reliable. The required AC-DC-AC conversion system equipped with DCDC boost converter has been designed. To investigate the efficient performance of that conversion system especially at low current speed, different operating conditions were studied; the system was tested with/without boost converter at different current speeds operation. Moreover, the effect of including boost converter on the total harmonic distortion THD is checked.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901A NOVEL DIRECT TORQUE FUZZY CONTROLLER FOR PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE1157116712817610.21608/jesaun.2009.128176ENA. A. HassanElectrical Engineering Department, Faculty of Engineering , El -Minia University, EgyptY.S. MohamedElectrical Eng. Dept., Faculty of Engineering, El -Minia University, EgyptA.M. El-SawyElectrical Eng. Dept., Faculty of Engineering, El -Minia University, EgyptE.G. ShehataElectrical Eng. Dept., Faculty of Engineering, El -Minia University, EgyptJournal Article20090712This paper studies the performance of the direct torque control of the permanent magnet synchronous motor drive. Direct torque control has several advantages such as simplicity, fast transient response, less parameter dependence, and absence of rotor position sensor. However, the high torque and flux ripples are considered the main drawback of the classical direct torque control especially at low speed. The torque and flux hystersis controllers are considered the main sources of these ripples. In this paper, a novel fuzzy logic direct torque controller is proposed to enhance the performance of the classical direct torque control. The hystersis controllers and lookup table are replaced by the proposed controller. Fuzzy controller determines the switching states for the inverter from the torque and flux errors and flux position angle. The proposed scheme still has the all advantages of the classical direct torque control. No additional measurements or control loops are required. Simulation works have carried out to evaluate the performance of the proposed fuzzy logic direct torque controller scheme. The waveforms of the torque, flux and speed of the classical direct torque control are compared to those obtained from the proposed scheme.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901SCATTERING OF A FOCUSED GAUSSIAN BEAM BY A DIELECTRIC COATED SPHEROIDAL PARTICLE1169117912817710.21608/jesaun.2009.128177ENElsayed Esam M. KhaledElec. Eng. Dept., Assiut University, Assiut, EgyptJournal Article20090802Scattering of an on- or off-axis focused Gaussian beam by a coated spheroidal particle (either a prolate or an oblate) is presented. A technique combines the plane-waves spectrum and the T-matrix methods are used to solve the scattering problem. Results are shown for different beam focusing positions with respect to the particle and for different particle’s shapes (sphere, and prolate and oblate spheroids) of large size parameters, and for different core’s radius or shell’s thickness. The angular scattering intensities are affected by the changes of the core's radius in the case of spheroidal particle more than that for the case of a spherical particle resonates at a low-order mode. As the beam moves farther away from the center of the spheroid the effect of the core on the scattering intensity decreases. A coated spheroidal particle is much affected by changing the beam focusing position than that in the case of a homogeneous spheroidal particle.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901A NEW SWITCHING PATTERN FOR DIRECT TORQUE CONTROL OFA PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE1181119212817810.21608/jesaun.2009.128178ENA. A. HassanElectrical Engineering Department, Faculty of Engineering , El -Minia University, EgyptA.M. El-SawyElectrical Eng. Dept., Faculty of Engineering, El -Minia University, EgyptY.S. MohamedElectrical Eng. Dept., Faculty of Engineering, El -Minia University, EgyptE.G. ShehataElectrical Eng. Dept., Faculty of Engineering, El -Minia University, EgyptJournal Article20090811This paper aims to enhance the performance of the direct torque control (DTC) of a permanent magnet synchronous motor drive. Direct torque control has several advantages such as fast transient response, less parameter dependence. It has no need either to pulse width modulation, current control loop or to speed sensor. However, the high torque and flux ripples content are considered one of the main problems of DTC. The two band hysteresis comparators of the torque and flux are the main reason beyond this problem. The inverter state does not change until the hysteresis outputs change. The slow change in the hysteresis output causes slow change in the inverter states which in turn increases the ripple content in motor torque. In this paper, a new switching pattern using non-hysteresis controllers and new look up table are proposed. Three band flux controller and five band torque controller are used instead of the conventional two band controllers. Zero and active voltage vectors are inserted into the conventional lookup table. The proposed technique neither needs additional measurements nor space vector modulation techniques. Simulation works are carried out to compare the performance of classical and proposed techniques. The torque, flux, current, and speed waveforms of the proposed and classical schemes are compared.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901EVALUATION OF GROUNDWATER AQUIFER IN THE AREA BETWEEN EL-QUSIYA AND MANFALUT USING VERTICAL ELECTRIC SOUNDINGS (VES) TECHNIQUE1193120712817910.21608/jesaun.2009.128179ENWaleed S.SMinistry of Water Resources (underground water sector)Abd El-Monaim, A, EResearch Institute for GroundwaterMansour M.MMining & Met. Dept., Faculty of Eng., Assiut UniversityD El-Karamany M. FMining & Met. Dept., Faculty of Eng., Assiut UniversityJournal Article20090805The studied area is located northwest of Assiut city which represents a large part of the Nile Valley in Assiut governorate. It lies between latitudes 27° 15ƍ 00Ǝ and 27° 27ƍ 00Ǝ N, and longitudes 30° 42ƍ 30Ǝ to 31° 00ƍ E, covering approximately 330 square kilometers. Fifteen Vertical Electrical soundings (VES) were carried out to evaluate the aquifer in the study area. These soundings were arranged to construct three geoelectric profiles crossing the Nile Valley. Three cross sections were constructed along these profiles to detect the geometry and geoelectric characteristics of the quaternary aquifer based on the interpretation of the sounding curves and the comparison with available drilled wells. The interpretation showed that the thickness of the quaternary aquifer in the study area ranges between 75 and 300 m, in which the maximum thicknesses are detected around Manfalut and at the west of El-Qusiya.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901ARCHITECTURE OF HOT ZONES AND UTILIZATION OF SOLAR ENERGY (CASE STUDY IN ONE OF HADRAMOUT GOVERNORATE – AL –MUCALLA CITY)1209123412818010.21608/jesaun.2009.128180ENAL-Sagaf M.ADepartment of Architecture Environmental Planning, Faculty of engineering
& Petroleum Hadhramout University of science & TechnologyJournal Article20080827Yemen is one of countries that lie in the hot arid zone near the equator. In spite of the appropriateness of its traditional architecture to this type of climate, the new buildings suffer a lot of problems due to neglecting the climate issue. Large areas of glass have been adopted in many new building with no devices for avoiding high solar radiation. The present study is done of cases on exploring the concepts behind the traditional solutions. It presents examples of traditional architecture in Mukalla. It directs the attention of the important of adopting climatic design approach to avoid the harm effect of intense radiation, and at the same time make are of the abundance of solar radiation.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901THE VERNACULAR AFFILIATION BETWEEN CONCEPTS OF SOCIAL JUSTICE AND ITS IMPACTS ON DESIGN-RELATED AGENDAS1235125112818110.21608/jesaun.2009.128181ENHally El KonyDepartment of Architecture, Faculty of Fine Arts, University of AlexandriaGhada El KonyDepartment of Architecture, Faculty of Fine Arts, University of AlexandriaJournal Article20090623The paper depicts two main design approaches that are emanated from the ethics of social justice, i.e., the inclusive design and the sustainable design. Despite the significant advancement of these approaches in theory and practice, they haven’t generated yet substantial design guidelines and regulations for public and/or residential settings that are pertinent to the real practice of design-related professionals, especially architects and interior designers. For this purpose the paper investigates /whether the 2 approaches are two sides of the same coin or are disparate set of ideas with totally separate agendas. It draws up the distinctiveness and disparity as well as the affiliation of their related concepts. The paper ascertains a tangible relationship that exists between the 2 approaches of social justice which enables an appropriate and unified field theory and practice. It also suggests an operable and inclusive agenda for design problem-solving based on the universality of design as an integrated dimension of social sustainability with the main purpose to ensure full participation and equal opportunity for every person in society. Finally, an exposure of some of the impediments that encumber the advancement of this agenda is sketched out.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901A COMPARATIVE STUDY OF IDENTITY ELEMENTS IN TOURISTIC ARCHITECTURAL BUILDINGS WITH THE DISTINGUISHING FEATURES OF TRADITIONAL YEMENI BUILDINGS IN ALMUKALLA CITY1253127312818510.21608/jesaun.2009.128185ENEssam El-Din Kamal MahrousArchitecture Department - Faculty of Engineering - Assiut UniversityKhaled Mohamed Ahmed El-LithyArchitectural Engineering Department, Faculty of Engineering, Assiut University, Assiut, EgyptAbdul Aziz Abdullah Awad Al-NajjarArchitecture Department - College of Engineering - University of HadramoutJournal Article20090630Architectural identity is a vital topic that raised many arguments recently, within maintaining the traditional architectural style of ancient cities. This paper discusses identity for the purpose of studying the absence of identity and characteristic style of traditional Yemeni architecture in contemporary tourist buildings, represented by hotels. This paper aims to study the reasons and factors that led to the absence of architectural identity from tourist buildings in an attempt to root civilization values and features characterizing the architectural identity of traditional buildings in Yemeni cities. This was achieved by reviewing the distinguishing features of traditional Yemeni buildings in Almukalla city, as a tool to measure and compare the identity elements of contemporary Touristic Buildings in Almukalla city, with the items characterizing the architectural elements of traditional buildings. This paper uses the analytical method, by presenting views of local architects (practicing and academic), by the questionnaire that treated in detail the points of identity, beside analyzing the results of a field survey for a selected sample of hotels in Mukalla to recognize the extent to which touristic buildings could maintain elements and items characterizing architectural identity of traditional buildings in the city. This paper attempted to set some frameworks based on studying and evaluating the traits of local traditional architecture characteristic of Yemeni cities. They include functional spaces (varying from general to private use), and façade treatments (including building pattern, openings, ornaments, and building materials). This paper is concluded with a number of results. The main points of results aim to maintain the characteristic style of traditional Yemeni architecture, and pay attention to the architecture of contemporary touristic buildings in Almukalla city. This is done by implementing the technical, and architectural Hadrami elements and create their own style; so that they achieve individuality and identity – characteristic of this type of buildings to express the style of their surrounding Yemeni environment.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901DESIGN CONSIDERATIONS OF WOMEN'S HEALTH HOSPITALS OF (MUKALLA CITY IN YEMEN1275129712819110.21608/jesaun.2009.128191ENMagdy Mohamed RadwanProfessor and Head of Department - Architecture - Assiut UniversityMamdouh Ali YoussefLecturer, Department of Architecture - Assiut UniversityWafa Abdullah BellaMaida, Department of Architectural Engineering - Hadramout UniversityJournal Article20090706Hospitals are important buildings for the health of the individuals. They have considerations and criteria appropriate to the nature of the task they perform and the kind of users in order to fulfill their aims of providing the necessary treatment for patients, education and training of doctors in various disciplines. The research aim is to identify the reality of women's health hospital buildings in the city of Mukalla in Yemen for the detection of existing problems, and the extent of user satisfaction about hospital services which depending on the field study about the hospital (survey and questionnaire) to identify the problems and provide treatments and solutions. To achieve the goal of the research through the analytical approach, it has begin by giving a background on the theoretical considerations for the design of women's health hospitals to take measures of the effectiveness of the procedures for the analysis and to provide solutions and recommendations to improve the quality of hospital services.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053037No 520090901CHANGING URBAN SYSTEM FROM MONOCENTRIC TO POLYCENTRIC AS A CONCEPT FOR NATIONAL URBAN STRATEGY FORMATION1299131912819510.21608/jesaun.2009.128195ENIbtihal Ahmed Abdel MutiLecturer, Department of Regional Development, College of Urban and Regional Planning, Cairo UniversityJournal Article20090716The urban balance has been a major issue on the regional and national level, and its trend has great importance for development and policymaking. Many regional and spatial policies have been pay attention to the city system as a tool to achieve development and reduce regional disparities. Recently it has been argued that the polycentric urban system distribute relevant economic functions over the urban system in such a way that a multitude of urban canters can play an economic role in a territorially balanced way rather than one or two gains benefits. A growing research assumes a strong relationship between the urban system and the persistence of regional disparities. A monocentric urban system, with a dominant city, often the capital, dominating over other cities would lead to divergence; while on the contrary, a more polycentric urban system would allegedly lead to convergence between regions. The paper suggests that polycentric development can be a regional and national development instrument to reduce disparities in Egypt, and support dynamic growth for the whole country and its regions through regional spillovers. The paper presents measures of the extent of polycentricity of the national urban system and its trend through many periods and several city sizes ranges. This data is linked with calculations of regional disparities within these ranges depending on unemployment and GDP data for cities. The findings from the data analysis observed variations in the relation between city ranges and disparities although the strong relation between rank-size distribution and the emerging of polycintricity in some ranges. The paper proposes important methodological and institutional needs to establish polycentric urban system in Egypt .