@article { author = {Issa, Fadwa and Eilouch, Mohamad Nazih Alyagchi and Tasnimi, Abbas}, title = {AN INVESTIGATION ON THE PERFORMANCE LEVEL OF RC SHEAR WALL-FRAME SYSTEMS UTILIZING NONLINEAR ANALYSIS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1239-1259}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129421}, abstract = {Prediction of performance level of the reinforced concrete Shear wall-Frame structural systems are not only dependent on the method ofnonlinear analysis, but are also related to some effective parameters usedin each method. This article studies the effect of some importantparameters such as plastic rotational capacity of the structural elements,capacity spectrum, drift and the overall damage of the building, from twoviewpoints, one of which is the performance level of structural elementsand also the performance level of the overall structure neglecting the nonstructuralelements. In order to achieve the expected results, 92 nonlinearanalyses including 64 nonlinear static analyses and 28 nonlinear dynamicanalyses have been carried out on three dimensional buildings comprising8, 12, 16 and 20 stories. These buildings were analyzed and designedaccording Syrian concrete code of practice (2004).All of the nonlinear analyses were carried out on the bases of the abovementioned parameters as a main criteria utilizing IDARC-ver6 program.The obtained results show that the performance evaluation based onoverall displacement of the whole structure and the failure of an element,is a restriction of capacity curve which has provoked some doubts.}, keywords = {shear wall-frame systems,Nonlinear Analysis}, url = {https://jesaun.journals.ekb.eg/article_129421.html}, eprint = {https://jesaun.journals.ekb.eg/article_129421_dd53e4fc727da2de16a1c9626062d71e.pdf} } @article { author = {Abdalla, El-Sayed Mohamed and Enieb, Mahmoud and Mohamed, Ramy Nasr Abd El-monem}, title = {INVESTIGATION IN SELECTING THE OPTIMUM AIRPORT RUNWAY ORIENTATION WITH SPECIAL REFERENCE TO EGYPTIAN AIRPORTS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1261-1280}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.112516}, abstract = {Determination of a runway orientation is a critical task in the planning and design of an airport. Runways usually oriented in the direction of the prevailing winds. The best direction can be decided through proper execution of wind analysis for designated area. In this study, wind analysis is conducted by manual analysis and computer analysis to check the accuracy of used software in computer analysis by comparing their results with the manual procedure. The manual analysis represented by windrose type II while the computer analysis represented by two software FAA Airport design and Windrose PRO. In order to analyze the available local wind observations with windrose II manual procedure and FAA Airport design software they must be converted to suitable windrose statistics so that a third software should be used . In this study WRPLOT View software is used to do this task. In this study three case studies Aswan international airport, Al Nozha international airport and Marsa Alam international airport were studied. These cases studies subject to wind analysis by use of manual analysis and computer analysis. For FAA Airport Design and WindRose PRO software there were small differences between its results and windrose II manual analysis results. In order to verify the optimization process in each case study, a comparison was made between existing runways orientation and estimated optimum runways orientation. For Aswan international airport the existing runway which has actual orientation of 170.88/350.88 which provides 98.07% wind coverage while the optimum runway orientation is 174/354 which provides 98.2% wind coverage. For Al Nozha there are two existing runways which have actual orientation of 45.06/225.07 and 179.99/359.99 which provides 84.11% and 93.27% wind coverage respectively while the optimum runway orientation is one runway with orientation of 146/326 which provides 96.04% wind coverage. For Marsa Alam international airport the existing runway which has actual orientation of 149.75/329.76 which provides 99.65% wind coverage while the optimum runway orientation is 156/336 which provides 99.72% wind coverage. Parametric analysis applied on each case study in order to studying the effect of each controlling parameter on wind coverage. This analysis is proceed by use of FAA Airport Design software because it allow the designer to keep the other parameters fixed while changing one of them. These parameters are number of runways, runway orientation, maximum allowable crosswind component and maximum allowable tailwind component.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_112516.html}, eprint = {https://jesaun.journals.ekb.eg/article_112516_f9dcb2cbb38a0b6cd7691a652ac2b600.pdf} } @article { author = {Nasser, Issam}, title = {SEISMIC ISOLATION SYSTEMS FOR REDUCING THE DYNAMIC RESPONSE OF THE ELEVATED WATER TANKS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1281-1299}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129422}, abstract = {This research discusses the seismic response of the elevated water tankswhich is represented by the base shear forces, displacements and bendingmoment values, and also studying the dynamic characteristic for this typeof especial structures, such as the period and frequencies of vibration , allthese are done by dynamic analysis for 3-D mathematical modelsaccording to response spectrum ,with considering the fluid-structureinteractions by representing this fluid with spring-two masses equivalentsystem: impulsive and convective masses .This analysis has been done bySAP 2000 program . This research involves studying the effect of frictionpendulum system (FPS) in dissipating the vibration energy caused byseismic effects on the elevated tanks, and the influence to the response anddynamic specifications values. Also, in this paper the seismic behavior ofthese elevated tanks which are supplied by tuned mass damper has beenevaluated.A reinforced concrete- elevated water tank has been analyzed and thedynamic analysis results of these seismic isolated tanks showed that thedisplacements, base shear forces and bending moment generally decreased}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129422.html}, eprint = {https://jesaun.journals.ekb.eg/article_129422_0725b1f6b954e2646cdb097611fccb96.pdf} } @article { author = {Abdel Aziz, EL Sharif and Altohamy, Ahmed and Towfeek, Ahmed}, title = {EXPERIMENTAL STUDING ON THE STABILITY OF SANDY SLOPES STABILIZED WITH CEMENT KILN DUST UNDER THE EFFECT OF STRIP FOOTINGS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1301-1319}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129424}, abstract = {In this paper, presents of experimental tests carried out on physical andchemical properties of cement kiln dust. Cement kiln dust is considered aone of waste which produced in a local cement production plantproduction plant Portland cement manufacturing in Assuit CementCompany-Egypt. The main aim of this study is to examine some factorsthat influence the performance of a strip footing resting on a sandy slopeby the utilization with CKD. This study aims also at establishingrelationships between the bearing capacity and the CKD percentage andforming a database for future development of a rational design method.The angle of the slope was taken equal to (42o). Laboratory tests onsmall scale model were carried out. The experimental model wassimulated by the finite element method (FEM) using the computerprogram PLAXIS. The verification of the numerical results by thecorresponding experimental results has been done to emphasis theaccuracy of the parameters used in the numerical analysis.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129424.html}, eprint = {https://jesaun.journals.ekb.eg/article_129424_94b2e9e0207232efebf81d462856ce31.pdf} } @article { author = {Diab, Hesham}, title = {EFFECT OF MINERAL OIL ON REINFORCED CONCRETE STRUCTURES PART I. DETERIORATION OF COMPRESSIVE STRENGTH}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1321-1333}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129426}, abstract = {This paper is the first part of general study started at Assiut Universitydealing with effects of mineral oil on reinforced concrete structures. Thisstudy focused on the impact of used engine oil on the compressive strengthof concrete. Compressive strength of concrete cubes soaked in usedmineral oil for six months were compared with that of oil-free concretecubes. Five different concrete mixes were adopted to investigate theaggressiveness of mineral oil on low and high strength concrete.Furthermore, this paper describes an investigation into the effect of oilsaturation on concrete frame foundations used for large machines ofCement Assiut factory-CEMEX. It is concluded that evaluation of theaggressive effect of mineral oil on concrete by comparing the strength onoil-free concrete and oiled concrete at the same age experimentally is theoptimal and most reliable of the existing method. The aggressiveness of oilis very clear for low and high strength concrete and the reduction incompressive strength is 17, and 11.8 percent respectively. Additionally,based on the field study, degree of oil saturation in concrete plays animportant role in compressive strength.}, keywords = {oil,used mineral oil,low and high strength concrete,Compressive strength}, url = {https://jesaun.journals.ekb.eg/article_129426.html}, eprint = {https://jesaun.journals.ekb.eg/article_129426_77f4b435c8618a5f68d07f327c38f354.pdf} } @article { author = {TALAT, L. A. and F. Bady, Mahmoud and M. Hassanien, Hassanien and Kamal El-Deen, Adel M. and Hussein, A. M}, title = {STUDY OF SOLID WASTE AND ASHES CONTENT OF RADIOACTIVE AND HEAVY METALS IN ASSIUT THERMAL POWER PLANT}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1335-1342}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129443}, abstract = {The combustion of heavy fuel oil concentrates a high content of heavy elements in the ashes. These elements are vanadium, calcium, magnesium, sulfur, sodium, zinc, iron, silicon, nickel, aluminum and manganese, and radioactive metals as uranium and thorium. These elements have dangerous environmental impacts. Also water treatment unit’s produces solid wastes. Such wastes later enter the environment by different pathways producing adverse effects on the quality of life, so reduction of the amount of solid wastes to be discharged to the environment goes in accordance with Egyptian Environmental Legal solid wastes discharge Regulations and man’s welfare.}, keywords = {Thermal power plant,Solid waste,Radioactive and Heavy Metals}, url = {https://jesaun.journals.ekb.eg/article_129443.html}, eprint = {https://jesaun.journals.ekb.eg/article_129443_d92f6030b2ab3f21ce8537d5780f6804.pdf} } @article { author = {Ali, A.S. and Ismail, I.M. and Ahmed, M.S.}, title = {STUDY OF THE PERFORMANCE OF AIR CONDITIONING SYSTEM INCORPORATING CHILLED WATER STORAGE}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1343-1360}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129445}, abstract = {In the present study, an air conditioning system with a storage tank was constructed and tested. Along the 24 hrs, eight tank-charge cycles were performed to evaluate the effect of variation local ambient temperature on the system performance. A significant variation in the values of COP due to variation in local ambient temperature in Sohag city was recorded. There are two modes of chilled water storage, full-storage and partialstorage. This study deals with partial-storage mode. In this study, a comparison has been carried out between air conditioning system without chilled water storage and that with storage. Configuration of storage tank has a significant effect on system performance. Two storage tanks with aspect ratio of 1.1 and 2.2 were tested. A COP of 1.63 was achieved for the adopted system for no-storage mode. In partial-storage mode, the COP achieved was 1.73 in case of storage tank with aspect ratio 1.1, and 1.79 with aspect ratio 2.2.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129445.html}, eprint = {https://jesaun.journals.ekb.eg/article_129445_c15a8b2d4f852340f6bb715d982fefdd.pdf} } @article { author = {Badya, Mahmoud F. and A. Dhaiban, Abdullah and Hassanien, Hassanien M. and S. Soliman, M-Emad and ElSebaie, M.G.}, title = {FINITE ELEMENT SIMULATION OF ACOUSTIC ATTENUATION PERFORMANCE OF ELLIPTICAL MUFFLER CHAMBERS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1361-1373}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129446}, abstract = {A three-dimensional finite element analysis has been implemented to predict the transmission loss of an elliptic expansion chamber muffler for a given frequency range. Finite element models have been established by ANSYS 12.0.1. Results obtained from the model were compared with both experimental data obtained from previous work of Gerges et al. [1] . Comparison showed an excellent agreement between modeling results and experimental data. Six muffler configurations of different major/minor axis ratios of elliptic expansion chamber (a/b), with equal chamber volume have been modeled. Results demonstrated the ability of FEM to represent the acoustic attenuation performance of acoustical muffler. It also showed the effect of (a/b) ratio on the cut-off frequency due to multidimensional modes propagation. The FEM results were interpreted in various muffler configurations to determine the relationship between the number of domes in transmission loss characteristic curve and (a/b) ratio.}, keywords = {expansion chamber muffler,Finite Element Modeling,transmission loss}, url = {https://jesaun.journals.ekb.eg/article_129446.html}, eprint = {https://jesaun.journals.ekb.eg/article_129446_cf95da11c673fa475385b0d0dc2b110b.pdf} } @article { author = {Thabet, A. and Hassan, Amira}, title = {DESIGNOF COMPACT MICROSTRIP PATCH ANTENNAWITHANDWITHOUT GROUND PLANE SLOTUSINGNEW NANO-COMPOSITE MATERIALS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1375-1385}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129428}, abstract = {This paper has been enhanced the dimensions of the microstrip antennanamely; the height of the microstrip antenna with and without slotsubstrate and the width of the patch microstrip antenna, by using nanocompositematerials which are composed of RT Duriod 5880 withnanofillers (Fumed Silica, Aluminum Oxide and Graphite). In thisresearch, it has been innovate novel nano-composite materials as asubstrate for the microstrip antenna by adding nano-fillers to RT Duriod.Also,it has been demonstrated that the height and width of the suggestedmodel for the microstrip antenna smaller than the conventionalrectangular microstrip antenna. The suggested nano-composite materialhas been investigated efficient and compact microstrip antenna, compactsize, simple fabrication and increase radiation, bandwidth and surfacewave power of microstrip antennawith and without slot.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129428.html}, eprint = {https://jesaun.journals.ekb.eg/article_129428_f95ffb8b442df22caf834fff3c6d2bfa.pdf} } @article { author = {Shahin, Omar and El-Bardini, Mohammad and El- Rabaie, Nabila M.}, title = {CONTROL SCHEME OF A BOILER-TURBINE USING ADAPTIVE WAVELET NEURAL NETWORK}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1387-1401}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129429}, abstract = {In power plant control system, the capability to achieve an optimaltracking property of the nonlinear multi-input multi-output (MIMO) unitshas been an important task. This paper proposes a direct adaptive waveletneural network controller of boiler-turbine system for improving theperformance and efficiently achieving the good tracking property to meetthe load demands under load changes, large disturbances and change ofsystem operating points. This paper describes the application of a multiloop < br />direct adaptive wavelet neural network for a drum boiler; threeimportant outputs were controlled using a direct adaptive controller.WNNs are rapidly trained with adaptive learning rates (ALRs) which havebeen derived from the discrete Lyapunov stability theorem and used toguarantee the convergence of the WNN controllers. Simulation resultsshow that the robustness and the good performance of the proposedcontrol system to satisfy stable tracking of the boiler-turbine system.}, keywords = {Boiler-turbine control system,Wavelet transforms,Neural Networks,Direct adaptive control}, url = {https://jesaun.journals.ekb.eg/article_129429.html}, eprint = {https://jesaun.journals.ekb.eg/article_129429_def1918661d055b67fbf0ffdac526cef.pdf} } @article { author = {El-Fishawy, Nawal and M. Zahra, Mohammad and El-gamala, Mostafa}, title = {OPTIMIZING WIMAX MAC LAYER PARAMETERS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1403-1415}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129431}, abstract = {In this paper some WiMAX MAC layer parameters will be optimized toimprove applications performance. The study is aimed to show, viasimulation, the effect of Automatic Repeat Request (ARQ) parameters onthe WiMAX performance. Also, it is aimed to verify the effectiveness ofUnsolicited Grant Service (UGS), Real Time Polling Service (rtPS), andEnhanced Real Time Polling Service (ertPS) in managing voice traffic andtheir effect on data traffic which use Best Effort (BE) service. The resultsshow that the video delay will be increased by from 5 ms to 24 ms whenenabling ARQ protocol on WiMAX network. It also give the optimumparameters for ARQ protocol to improve the WiMAX networkperformance. The research also shows that the best scheduling service forvoice is UGS; but it reduces the throughput for BE data.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129431.html}, eprint = {https://jesaun.journals.ekb.eg/article_129431_d53ce5996c478a8e303f30091ece4119.pdf} } @article { author = {Zahra, Mohamed}, title = {EFFECT OF ENVIRONMENTS ON GEOCAST ROUTING PROTOCOLS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1417-1429}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129432}, abstract = {This paper considers the problem of providing a geocast service in mobileAd hoc networks. It figures out how to select parameters for two selectedGeocast routing protocols via simulation. It presents a study for the effectof simulation environments (node density, traffic, mobility) on geocastrouting protocols. Geocast is useful for sending messages to everyone in aspecified geographical region.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129432.html}, eprint = {https://jesaun.journals.ekb.eg/article_129432_2380ae78499a25ad972457cbad159546.pdf} } @article { author = {Yousef, Ali}, title = {NEURAL NETWORK PREDICTIVE CONTROL BASED POWER SYSTEM STABILIZER}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1431-1447}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129437}, abstract = {The present paper investigates the power system stabilizer based onneural predictive control for improving power system dynamicperformance over a wide range of operating conditions. In this study adesign and application of the neural network model predictive controller(NN-MPC) on a simple power system composed of a synchronousgenerator connected to an infinite bus through a transmission line isproposed. The synchronous machine is represented in detail, taking intoaccount the effect of the machine saliency and the damper winding.Neural network model predictive control combines reliable prediction ofneural network model with excellent performance of model predictivecontrol using nonlinear Levenberg-Marquardt optimization. This controlsystem is used the rotor speed deviation as a feedback signal.Furthermore, the used performance system of the proposed controller iscompared with the system performance using conventional one (PIDcontroller) through simulation studies. Digital simulation has beencarried out in order to validate the effectiveness proposed NN-MPCpower system stabilizer for achieving excellent performance. The resultsdemonstrate that the effectiveness and superiority of the proposedcontroller in terms of fast response and small settling time.}, keywords = {Power System Stabilizer,NN_MPC control and single synchronous machine infinite bus systems}, url = {https://jesaun.journals.ekb.eg/article_129437.html}, eprint = {https://jesaun.journals.ekb.eg/article_129437_e216b78a20634a3336ff005ebb84294a.pdf} } @article { author = {Tantawy, Mohsen M. and Tag ELdien, Adly S. and Zaki, Rokaia}, title = {QOS - BASED RESOURCE ALLOCATION ALGORITHM FOR LONG TERM EVOLUTION (LTE) SYSTEM}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1449-1461}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129440}, abstract = {Long Term Evolution (LTE) has emerged as a comprehensive evolution ofthe Universal Mobile Telecommunications System (UMTS). In this paper, aQuality of Service (QoS)-guaranteed cross-layer resource allocationalgorithm for multiclass services in LTE system is proposed. Numericalresults demonstrate that the proposed algorithm can provide betterbehavior for QoS-based services than other previous resource allocationalgorithms.}, keywords = {LTE,QOS,OFDM,Cross-Layer scheduling algorithms,GBR,Non-GBR}, url = {https://jesaun.journals.ekb.eg/article_129440.html}, eprint = {https://jesaun.journals.ekb.eg/article_129440_fa88f40e495969049ee1cae82e635b41.pdf} } @article { author = {TALAT, L. A.}, title = {RELIABILITY AND COST BENEFITS ASSESSMENT OF WIND ENERGY CONVERSION SYSTEMS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1463-1473}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129442}, abstract = {This paper presents a probabilistic approach based on the convolutiontechnique to assess the long–term performance of a Wind EnergyConversion System (WECS) for both stand–alone and grid–linkedapplications. A methodology is developed to use the proposed model todetermine the maximum WECS installed capacity for a given number ofturbines on a wind farm to satisfy the load with a certain Expected EnergyNot Supplied (EENS). The technique is new in that it uses a simpleprocedure to estimate the joint probability distribution function of the totalavailable wind power and that of the turbines operating modes due tohardware failure. Analytical expressions are developed to assess thereliability and cost benefits in electric power systems. The proposedmethod is applied to the IEEE Reliability Test System (IEEE– RTS ).}, keywords = {Wind Energy Conversion System,reliability evaluation,cost benefits assessment}, url = {https://jesaun.journals.ekb.eg/article_129442.html}, eprint = {https://jesaun.journals.ekb.eg/article_129442_2f413e558cfab968c45de49de7e4f3a6.pdf} } @article { author = {M. Ali, Mohamed and Nofal, Adel and Kandil, Amr and Agour, Mahmoud}, title = {USING OF HIGH PHOSPHORUS GRAY IRON FOR THE STUB- ANODE CONNECTION IN THE ALUMINIUM REDUCTION CELLS}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1475-1486}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129448}, abstract = {High phosphorus gray iron (HPGI) is used to secure the steel stub of an anode rod to a prebaked anode carbon block in the aluminium reduction cells. During this work, a detailed characterization for HPGI was done. The variation in the chemical composition of the HPGI collar, anodic voltage drop, and collar temperature over the 30 days anode life cycle were studied and compared with HPGI microstructure at different stages of the experiment. The carbon content in HPGI during anode life cycle was reduced from 3.73 to 3.38%. Significant changes in the HPGI microstructure were observed after 3 and 30 days from the anode changing. The collar temperature increases over the anode life cycle and reaches to 850°C in four weeks after anode changing. Different changes in the anodic voltage drop values at the stub- collar-anode connection during anode life cycle were recorded. Two bench- scale experimental set-ups were designed and implemented to simulate the operating conditions in the steel stub/ HPGI collar/ anode block connection and used to measure the electrical resistance and resistivity respectively. Comparison with steel electrical resistivity showed the greatest importance to modify the current HPGI or producing new alloys with excellent electrical and mechanical properties. The steel stub and HPGI thermal expansion were measured and studied. Considerable permanent expansion was observed for the HPGI collar after the completion of the heating-cooling cycle.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129448.html}, eprint = {https://jesaun.journals.ekb.eg/article_129448_0b6c611d7ab6da4ed626a88fc49b9007.pdf} } @article { author = {Hosni Ali Hassan, Ahmed}, title = {THE EGYPTIAN EXPERIMENT OF THE NATIONAL YOUTH HOUSING IN NEW ASSIUT CITY "BETWEEN NEEDS AND PROSPECTS"}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1487-1502}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129450}, abstract = {A FAO*1 report indicated that young people are increasing worldwide. Statistics indicate that the percentage of youth (18-35) is about 33% of the total population in 2006. so, the U-20 age category represent 70% of the population, a unique structure of Egypt. The Egyptian society, now and in the future, is a youth society. A recent official statistical report (2007) revealed that the number of never married young men and women, though 35 in age, reached about 12 millions. Hence, came the cause of attention to solving the lowincome youth housing problem. Distinguishing between giving tranquilizers and providing radical solutions for housing problems; is vital for solving them. It can be said that there is a causative relationship between (the low productivity of low-income youth) and (the obstacles to solving the housing problem). So, it takes an integrated work system, and nontraditional meanswhether by the state, the individuals, or the NGOs *2- to solve this problem. This paper attempted to study the gap between supply and demand, and the role of the government for creating some balance by turning towards new cities: starting from youth housing projects and ending by the projects "Build your house" and "Build your apartment"- a new project under study. But, were these cities an attraction or an expeller for youth and low-income? Is it possible to take new decisions to measure the efficiency of these projects after handing residential units to users (post-occupancy evaluation)? How far are users satisfied with these units? How can these units be preserved and maintained? This is done by evaluating these projects, and studying their cons and pros to make use of the evaluation results in similar future projects. Despite being a third generation new city; New Assiut City suffers, like any other new city, from youth abandonment. Though there were official attempts to relieve the burden from youth's shoulders; still youth abandon New Assiut City, with a number of residents not exceeding 37%, 15 thousands in 2009*3, of the total targeted number estimated by 40 thousands in 2010, according to the first planning of the city. Thus, a gap emerged between the theoretical view of the government and the designer, in one side, and the facts of users' needs. A frame was reached, trying to integrate the different views of accomplishing users' needs and their concept of a suitable house. As for post-occupancy, we are trying to study residence (some models from the national youth housing project in New Assiut City) to learn how convenient it is for users and try to avoid defects in such future projects, in an attempt to achieve the most convenient residence for occupants.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_129450.html}, eprint = {https://jesaun.journals.ekb.eg/article_129450_7fcfde47589b7c54e1cee92bf66d809d.pdf} } @article { author = {Abdullah Al-Maqtari, Najib Ali}, title = {DEVELOPMENT OF HISTORICAL AND CULTURAL THAMAR CITY CENTER IN REPUBLIC OF YEMEN}, journal = {JES. Journal of Engineering Sciences}, volume = {39}, number = {No 6}, pages = {1503-1515}, year = {2011}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2011.129451}, abstract = {old historical cities are distinguished by beautiful architectural environment , fantastic natural landscapes and human architectural heritage which was existed due to long historical accumulations and this heritage is mixed with natural environment and they both constitute unique joint entity which resulted from cultural and social and economic civilizations for that cities. Historical cities are violated in terms of beautiful features changes by horizontal and vertical additions for that arenas, spaces , markets and buildings and thamar city is like the other Yemen cultural and historical cities. Through this research , we focus on highlighting the importance of historical cities and Thamar is example for the purpose of re-planning of main areas which will be the cornerstone for development and economic investment and attractive areas that activate the other parts of the city. This research deals with three main topics , the first one is to present the problem and the second one is to re-plan the axis that links between the Great Mosque and Sun School , which passes through the center of the city and to remove additions and deformations and the last one is to propose establishing investment center, which is supposed to be like basis for preserving and developing the historical city . The research reached to proposal that is aimed to open axis that links between great mosque and Sun School and to establish tourist and economic investment center to activate and rejuvenate historical cities.}, keywords = {Preservation,Development,Revival,investment,re-planning,historical city}, url = {https://jesaun.journals.ekb.eg/article_129451.html}, eprint = {https://jesaun.journals.ekb.eg/article_129451_8b6eddac9de3fd73e132759bcb26544d.pdf} }