@article { author = {M. HELMY, SHERIF and A. TARKHAN, MOHAMED and Hassan, Nasr Z. and M. ZAKI, MOHAMED}, title = {STRENGTHENING OF LOADED REINFORCED CONCRETE COLUMNS}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {507-520}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126482}, abstract = {One of the most common problems encountered in reinforced concrete structures is the non-conformity of the element properties and load capacity with the design expectations. Therefore, strengthening investigations that attempt to increase the load capacity of the defected structural element have become an important topic in the field of reinforced concrete studies, specially, for reinforced concrete columns. Recently, composite material such as fiber-reinforced polymer (FRP) started to become a good replacement for steel reinforcement for strengthening of reinforced concrete elements. In the eighties and nineties, the researchers and the construction industry showed great interest in this field and intensive researches were performed to begin the practical use of these materials. In this paper ten square columns of one third scale were tested and examined. These columns were loaded up to 0.3 or 0.5 of the nominal failure load. The load was kept constant at these values for about 24 hours. Columns were examined for the cracks and deformations, after that the columns were strengthened with glass fiber reinforced polymer (GFRP) or carbon fiber reinforced polymer (CFRP). Finally, the load increased till failure. The ultimate loads, mode of failure and energy absorption were recorded and analyzed.}, keywords = {R.C. Columns,strengthening,Pre-loading,Glass and Carbon Fiber}, url = {https://jesaun.journals.ekb.eg/article_126482.html}, eprint = {https://jesaun.journals.ekb.eg/article_126482_e6f3cd6be1244b9b670eb806aac18136.pdf} } @article { author = {Abo El-Wafa Mohamed, Waleed}, title = {NONLINEAR LATERAL RESPONSE OF MASONRY INFILLED RC BUILDINGS WITH VARIABLE PARAMETERS}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {521-541}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126483}, abstract = {Masonry infill (MI) walls confined by Reinforced concrete (RC) frames play a crucial role, either positive or negative, in altering the lateral capacity of buildings they are applied to. In this study, a nonlinear numerical investigation on the lateral behavior of masonry infilled RC buildings is carried out. Variety of parameters for both MI walls and buildings are considered. Different configurations of MI walls, size of wall openings, absence of MI walls in the first storey and MI wall thickness are investigated. The application buildings are either moment resisting frames (MRF) or dual shear wall-moment resisting frames (SW-MRF) buildings. The MRF buildings have 6 floors, while the SWMRF buildings have 5 different heights represented by the number of floors (from six to twenty floors). Equivalent strut methodology is used and modified to model the behavior of infill walls taking into consideration the effect of opening sizes. Nonlinear static push-over analysis is carried out for the applied case study buildings. It is found that MI walls can highly increase the base shear capacity of either building types while significantly reduce the displacement capacity of MRF buildings, RC shear walls can resist this negative effect. The existence of soft first storey can drastically alter the lateral response of buildings. The influence of MI walls fade as the building height increases. The new distribution of failure mechanism is introduced.}, keywords = {Masonry infill walls,push-over analysis,wall openings,soft storey,seismic codes}, url = {https://jesaun.journals.ekb.eg/article_126483.html}, eprint = {https://jesaun.journals.ekb.eg/article_126483_46574a316cea5080762eaea949a7b1ec.pdf} } @article { author = {Ahmed, M. H. and Hassanean, Y. A. and A. Elsayed, A. and M. Eldeep, A.}, title = {SHEAR BEAHAVIOR OF HIGH STRENGTH REINFORCED CONCRETE DEEP BEAMS}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {543-562}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126484}, abstract = {Behavior of deep beams is different than that of ordinary beams. In addition the effectiveness of the biaxial state of stresses is more pronounced in deep beams. So, sixteen reinforced concrete deep beams with compressive strengths from 250 to 650 kg/cm2 were tested to study their shear behavior under two-point static loading. The tested beams have shear span to depth ratio a/d from 0.5 to 1.25. All beams was singly reinforced with ratio ρ from 0.0113 to 0.0254, vertical reinforcement ratio ρv from 0.1 to 0.31, and horizontal reinforcement ratio ρh from 0.19 to 0.56. The patterns of cracks were traced, the modes of failure were observed, and the deformations were recorded as well as both cracking and ultimate loads were also measured. Test results indicate that both the concrete compressive strength and shear span to depth ratio have a pronounced effect on the cracking and ultimate load of high strength concrete. The values of the cracking shear strength of the tested beams show a remarkable difference in comparison with the corresponding recommended values given in ACI Code equation (11-29).}, keywords = {High strength concrete,Shear span to depth ratio,Longitudinal steel ratio,Web reinforcement ratio}, url = {https://jesaun.journals.ekb.eg/article_126484.html}, eprint = {https://jesaun.journals.ekb.eg/article_126484_b45720fb4957cc196a23b3294141e4a8.pdf} } @article { author = {El-Badawy Sayed, Ahmed}, title = {RETROFITTING AND STRENGTHENING OF REINFORCED CONCRETE COLUMNS USING STEEL JACKETS; MECHANICAL PERFORMANCE AND APPLICATIONS}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {563-580}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126485}, abstract = {Concrete jacketing is a commonly used method to retrofit or strengthen existing columns for axial loads. This can be made by longitudinal steel bars and additional concrete around an existing column or placing a jacket around the column. Each one of these methods has its difficulties regarding the new construction forms needed and the modification in column’s dimensions or the difficult welding works and corrosion problems. Recently, the topic of interest in the infrastructure community is to enhance the confinement of columns by using GFR or FRP composite sheets. Techniques of applying steel jackets around reinforced concrete columns are almost un–covered in the literature. The main objective of this research is to characterize the mechanical performance of reinforced concrete columns retrofitted or strengthened by using steel jackets made of hot rolled sections. Three types of columns having rectangular, square and circular cross-sections were investigated and tested under static axial compression loading. Cracking and ultimate loads, deformation properties as well as strains in both the concrete column and steel jacket were recorded and analyzed. Pattern of cracks and mode of failure were identified. The mechanical performance of retrofitted and strengthened columns was significantly improved. The ultimate loads obtained from testing retrofitted columns were found to be higher than the original ones by a value of 15-18%. The proposed steel jacketing technique, adopted in this research, has been successfully applied to some buildings, in our region, in order to retrofit or strengthen the existing columns. An excellent beneficial serviceability has been achieved. Photographs showing the steps of executing the steel jackets to existed deteriorated columns are attached.}, keywords = {COLUMNS,Retrofit,strengthen,axial compression,steel jacket}, url = {https://jesaun.journals.ekb.eg/article_126485.html}, eprint = {https://jesaun.journals.ekb.eg/article_126485_49a9b204f9c956ab6e02a4f056a6c329.pdf} } @article { author = {A. E., Sayed and , R. A. S, Mohamed}, title = {INVESTIGATIONS ON THE MECHANICAL PROPERTIES OF HIGH STRENGTH SILICA-FUME CONCRETE (HSSC) MIXES AT DIFFERENT AGES}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {581-592}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126486}, abstract = {In recent years, some organization increasingly encourages the use of cementitious materials such as fly ash, slag and silica fume. Silica fume is a by-product in the manufacture of ferrosilicon and also of a silicon metal. Lately, some attention has been given to the use of condensed silica fume as a possible partial replacement for cement. The main objective of this investigation is to study the effect of the binder system containing different levels of silica-fume, as a partial replacement of cement, on the mechanical properties of high strength concrete and particularly, to determine the optimum content of silica-fume that maximize the strength and mechanical performance of HSSC. The work in this research focused on concrete mixes having water/binder ratio = 0.32 and constant total binder content (cement and silica) of 450 Kg/m3. The percentages of silica-fume that replaced cement in this research were: 0.0, 5.0, 10.0, 15.0, 20.0 and 25.0 %. Compressive, splitting and flexural strength tests were carried out at the age of 28, 59, 90,180 and 360 days to identify the mechanical properties of HSSC mixes at different ages. The effect of water/binder ratio on the compressive strength of HSSC mixes has been also examined. The modulus of elasticity of the produced concrete mixes at age of 28 days was determined. Test results of this research indicated that, the partial replacement of silica fume instead of cement in concrete mixes up to a ratio of 15 % effectively improves the mechanical properties of concrete and produces high compressive strength, beyond this limit, the compressive strength significantly decreased.}, keywords = {Silica Fume,Concrete,compressive,splitting,Flexural,Modulus of elasticity}, url = {https://jesaun.journals.ekb.eg/article_126486.html}, eprint = {https://jesaun.journals.ekb.eg/article_126486_3f7bf02ccfcbd1305eb8fcb2bf2d17d7.pdf} } @article { author = {Shawki, K. M. and Abd EL-Razek, M. E. and Abdulla, N.}, title = {inEARTHMOVING PRODUCTIVITY ESTIMATION USING GENETIC ALGORITHM}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {593-604}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126488}, abstract = {This paper presents a framework for optimizing earth moving operations using computer simulation and genetic algorithms (GA) as an optimizer. The optimization aims at maximizing production of an earth moving fleet consists of an excavator and trucks as hauling units. The objective function considers the variables that influence the production of earth moving operations such as rolling resistance, grade resistance, vehicle weight, payload, horse power..etc. The constraints of the objective function are considered such as speed limits, payload capacity, etc. A sizing problem is considered to tune the GA parameters such as selection, crossover, population size, mutation, etc. Numerical examples are presented using developed software called "FLEET PRODUCTION" to illustrate the practical features of the proposed software and to demonstrate its capacities in selecting optimum fleet configurations. "FLEET PRODUCTION" is designed to assist engineers and contractors to select the best fleet combination of hoe and haulers that can complete an earth moving operation with maximum production.}, keywords = {Genetic Algorithms,Construction Equipment,productivity}, url = {https://jesaun.journals.ekb.eg/article_126488.html}, eprint = {https://jesaun.journals.ekb.eg/article_126488_66b1f1d8092d04f45ccf297dc84d0a1b.pdf} } @article { author = {El-Zanaty, Mohamed and Orabi, Mohamed and Member, IEEE and El-Sadek, M. Z.}, title = {NOVEL SOFT SWITCHING TECHNIQUE OF SYNCHRONOUS BUCK CONVERTER BASED ON ZVS-QSW WITH ADAPTIVE TECHNIQUE}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {639-652}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126490}, abstract = {Nowadays, the main important issue for power supplies designers is to feed last generation of microprocessors and DSPs, since they require high current slew rates on accompain with low output voltage. The most important issue with these power supplies is the efficiency, especially with ultra-high switching frequency. The main factor of limitation for these target systems with ultra-high switching frequency is the switching losses and body-diode losses. Zero-Voltage-Switching Quasi-Square-Waveform (ZVS-QSW) has been proposed to solve the matter of switching losses; however, it can not achieve that for wide-load applications. Besides, adaptive technique has been introduced to reduce the body-diode losses. In this paper, in this paper the advantage of the two techniques is assumed by merging them together. Moreover, a modification circuit is proposed to apply soft-switching technique for the main switch. In conclusion, novel soft switching technique is proposed for high-switching frequency synchronous buck converter based on ZVS_QSW and adaptive technique. The mathematical model is introduced and confirmed using PSIM simulation using 5MHz synchronous model.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126490.html}, eprint = {https://jesaun.journals.ekb.eg/article_126490_169760576290d8e12c2fde60150033ed.pdf} } @article { author = {Sayed Mohammed, Usama and Saber, Hany}, title = {ADAPTIVE APPROACH FOR BLIND SOURCE SEPARATION OF NONLINEAR MIXING SIGNALS}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {653-667}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126491}, abstract = {In this paper, a new technique to solve the nonlinear blind source separation problem (NBSS) is introduced. The method is based on the concept of reducing the high frequency component of the nonlinear mixed signal by dividing the mixed signal into blocks in the time domain, with any arbitrary size. To remove the distortion of the nonlinear function, the discreet cosine transform (DCT) is applied on each block. By adaptively adjusting the size of the DCT block of data, the highly correlated subblocks, can be estimated, then the correlation between the highly correlated sub-blocks can be reduced. To complete the separation process, the linear blind source separation (BSS) algorithm based on the wavelet transform is used to reduced the correlation between the highly correlated DCT subblock. Performed computer simulations have shown the effectiveness of the idea, even in presence of strong nonlinearities and synthetic mixture of real world data (like speech and image signals).}, keywords = {nonlinear blind source separation,discreet casein transform,Linearization,post nonlinear mixing and independent component analysis (ICA)}, url = {https://jesaun.journals.ekb.eg/article_126491.html}, eprint = {https://jesaun.journals.ekb.eg/article_126491_76ff825f94e7307bb94097b35ae3011f.pdf} } @article { author = {S. Mohamed, Yehia and El-Sawy, , A. M. and Zaki, A. A.}, title = {STATOR RESISTANCE ESTIMATION FOR SPEED SENSORLESS VECTOR CONTROLLED INDUCTION MOTOR DRIVES AS INFLUENCED BY SATURATION}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {669-690}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126494}, abstract = {In this paper, stator resistance estimation for a speed sensorless vector controlled induction motor drive taking saturation into account is presented. 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 inductance. Parallel stator resistance and rotor speed estimation based on model reference adaptive system (MRAS) has been used to obtain accurate estimation for rotor speed. On-line magnetizing inductance estimation has been used within the speed estimator. Digital simulations have been carried out in order to evaluate the effectiveness of the proposed sensorless drive system. The results prove excellent steady-state and dynamic performances of the drive system in a wide speed range, which confirms validity of the proposed scheme}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126494.html}, eprint = {https://jesaun.journals.ekb.eg/article_126494_e77886feee40e33c45c2ceebec38694f.pdf} } @article { author = {M. Saad, E. and A. Keshk, H. and Saleh, M. A. and Hamam, A.A.}, title = {SCHEDULING REAL-TIME TASKS IN MULTIPROCESSOR SYSTEMS USING GENETIC ALGORITHMS}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {691-698}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126495}, abstract = {Multiprocessors have been employed as a powerful computing means for executing real-time tasks, especially where a uniprocessor system would not be sufficient to execute all the tasks. This paper investigates dynamic scheduling algorithm for real-time tasks in a multiprocessor systems to obtain a feasible solution using genetic algorithms combined with earliest deadline first (EDF) and shortest computation time first (SCTF). A comparative study of the results obtained from simulations shows that genetic algorithm can be used to schedule tasks to meet their deadlines time , in addition to obtain high processor utilization.}, keywords = {Task Graph,Optimization,Real-time system,Genetic Algorithms,multiprocessor scheduling}, url = {https://jesaun.journals.ekb.eg/article_126495.html}, eprint = {https://jesaun.journals.ekb.eg/article_126495_d6723b69f820959412426e49e7523314.pdf} } @article { author = {Abdel-Shafi, N. Y.}, title = {Experimental Study on the Thermal Performance of a Heat Sink with Perforated Wavy Fins}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {605-620}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126497}, abstract = {This paper presents experimental results of heat transfer and friction in a horizontal rectangular duct equipped with perforated wavy heat sink. The duct has a cross-sectional area of 0.06 x 0.36 m2 . The heat sink fin has many perforations and is bent to form a wavy shape. The wavy perforated fins are oriented and fixed perpendicular to the heat sink base. Many different heat sinks of the same width and height, with different fins structure have been investigated (fourteen heat sinks). The Reynolds number, Re, is ranged from 16500 to 22000. The dissipated power was 100 W (4630 W/m2 ). Experimental work is performed for fins divergence angles, 2α, from 15 to 45 degree, the diameter of the fins perforations, D, was 2, 3 and 4 mm, and the holes pitch is varied from 5 to 28 mm. The results showed that the average Nusselt number, Nu, increases with Re increasing and that for all the studied configurations, the most effective parameter on the Nu, was found to be fin divergence angle. Correlations are obtained for the average Nusselt number utilizing the present measurements within the investigated range of different parameters.}, keywords = {Heat sink,perforated fins,wavy fins,cooling of electronics}, url = {https://jesaun.journals.ekb.eg/article_126497.html}, eprint = {https://jesaun.journals.ekb.eg/article_126497_d4eeee52a7d71f47e179a1a11ede9292.pdf} } @article { author = {Ahmed,, M. H. and Abdel-Shafi, N. Y. and Abdel-Rahman, Ali K.}, title = {A SIMPLE NETWORK MODEL OF THE TRANSIENT BEHAVIOR OF FLAT PLATE HEAT PIPES}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {621-637}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126498}, abstract = {A simple network analysis to study the transient thermal performance of a flat plate heat pipe is developed in this study. The transient behavior of the flat plate heat pipe is described by simple, first order, linear ordinary differential equations that can be solved easily using matrix inverse method. A comparison of the results obtained using this simplified model with some existing experimental results available in the literature is conducted. It is found that the network model can be successfully used to simulate the transient behavior of flat plate heat pipes. Parametric study is conducted to investigate the effect of different parameters on the maximum and minimum temperatures of the flat plate heat pipe}, keywords = {Flat plate heat pipe,Network modeling,Transient thermal performance}, url = {https://jesaun.journals.ekb.eg/article_126498.html}, eprint = {https://jesaun.journals.ekb.eg/article_126498_bd113118b871a94ccd5aa4061417428e.pdf} } @article { author = {Elashiry, A. A. and Gomma, W. A. and Imbaby, S. S.}, title = {NUMERICAL MODELLING OF SURFACE SUBSIDENCE INDUCED BY UNDERGROUND PHOSPHATE MINES AT ABU-TATUR AREA.}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {699-709}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126502}, abstract = {Different methods have been adopted to predict and quantify the subsidence by the subsidence parameters. These methods can be classified into three categories as follows: - 1) Empirical methods based on the analysis of the field measurement, 2) Mathematical theories, 3) Numerical models including Finite Elements, Boundary Elements, and Distinct Elements methods. In this paper, the vertical component of subsidence is measured over working longwall panel at Abu-Tartur phosphate mines along transversal profiles at different face advancing rates. Finite element method (FEM) is applied to predict the subsidence trough over the excavated panel at different face advancing rates using three dimensional finite element program (Ansys package). The obtained results are compared with the measured ones. It was found that FEM results for surface subsidence coincide well with the measured data with a reasonable accuracy (correlation coefficient higher than 0.98). The degree of ground surface tilt, surface curvature and strain are obtained also by FEM model.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126502.html}, eprint = {https://jesaun.journals.ekb.eg/article_126502_ed7b33b0425b0007d523de31b547f395.pdf} } @article { author = {M. Ahmed, Mahmoud}, title = {EFFECT OF COMMINUTION ON PARTICLE SHAPE AND SURFACE ROUGHNESS AND THEIR RELATION TO FLOTATION PROCESS: A REVIEW}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {711-741}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126503}, abstract = {The geometry of particles has an influence on the physical and chemical actions occurring on the particle surface within the technological processes. This illustrates the important of the exact geometrical evaluation of the particles by means of quantified particle parameters. These parameters can be used to differentiate between different materials or to correlate them with the different processes. The essential characteristics of the distinction of particles are size, shape and surface roughness. Generally, particle shape and surface roughness can be considered as important parameters in the prediction of the behavior of particles individually or collectively. These parameters are of great importance to industries employing various materials in a powder form. These industries include many of the raw materials in civil and chemical engineering, pharmaceutical, mining industries, pigments, metals, ceramics, pills, foods, and industries interested with population of atmospheric dusts, smoke and grit. These parameters have not been currently reviewed satisfactory in the mineral processing field. Therefore, this review research is concerned with the different methods used to identify the particle shape and surface roughness and also to relate these parameters with the behavior of some mineral processing operations, especially comminution and flotation processes. The surface roughness of mineral particles has influenced the fundamental processes of particle-bubble attachment and the other subprocesses in froth flotation. The contact angle is dependent on the surface roughness. The modification of the wettability due to surface roughness can be greatly enhanced in the fractal surface; that is the fractal surface will be supperrepellent/superwettable to a liquid when the contact angle is greater/less than 900 . Correlations were found between the shape properties, surface roughness values and wettability. The dry grinding has produced relatively rough particle surfaces with a high concentration of microstructural defects while the wet grinding produced smoother cleaner surfaces. The dry ground samples exhibited more stable, higher loaded froths and faster flotation kinetics.}, keywords = {Particle shape,Surface roughness,Fractal,comminution,flotation,wettability}, url = {https://jesaun.journals.ekb.eg/article_126503.html}, eprint = {https://jesaun.journals.ekb.eg/article_126503_2c1da0d856365dd11e64db6c55add5f4.pdf} } @article { author = {T.G, Bazara and M.A, AL-Sagaf and O.A, AL-Sagaf}, title = {ENVIRONMENTAL STUDY FOR DEVELOPER HISTORICAL ZONES IN TOWNS OF HADHRAMOUT VALLEY}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {743-778}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126505}, abstract = {Heritage and historical zones is considered very important for its palaces, administrative buildings, historical and old zones in these cities. In the last two decades these cities had a problem of developing by new architecture by using skeleton of concrete and modern materials. All these give a minus effect upon the style of the there zones. This research aimed to resolve the environmental effects to develop these zones in the field of streets, transportations and pedestrian, green areas, in and around these historical buildings in these old areas. Thus that research takes care with these cities in Hadhramout valley and the heritage civilization of it, studding the case of climate and how to protect from it. Then the research give an idea about cases of treatment for urban and environment in these zones. That gives us the important of urban planning and environmental studies to serve the economical, social and touristic regards in these cities. Final the research gives us the important results and the recommendations which we could recognize our aims for having heritage and environmental urban and suitable zones in our cities in Hadhramout valley}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126505.html}, eprint = {https://jesaun.journals.ekb.eg/article_126505_50b3c14aea93bfaded0fe406f07e16aa.pdf} } @article { author = {S. Abdelmagid, Essam and Mahdavi, A. and Radwan, M. and Marghany, E. and Orehounig, K.}, title = {USING SIMULATION TO EVALUATE AND IMPROVE THE THERMAL PERFORMANCE OF COURTYARD OFFICE BUILDINGS IN CAIRO}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {779-788}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126509}, abstract = {This paper explores the implications of alternative design options for the thermal performance of office buildings in Cairo, Egypt. Typical courtyard office floor plan was selected for the investigation. Multiple design alternatives were considered involving various glazing and shading types, shading schedules, thermal insulation options, orientations, and ventilation scenarios. A numeric thermal simulation application was used to model the performance of these alternatives parametrically*1. The results show the significant degree to which design measures could reduce cooling requirements of (and overheating tendencies in) courtyard office buildings in Cairo.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126509.html}, eprint = {https://jesaun.journals.ekb.eg/article_126509_f1a67b329b5e3bfffec1d5b6f0ed3825.pdf} } @article { author = {Morghany, Ezzat Abd El-Moniem and Kamal Mahrous, Esam El-Din and Raafat Adeeb, Nevin}, title = {THE ROLE OF THE URBAN MANAGEMENT IN SOLVING THE URBAN PROBLEMS )ASSIUT CITY AS A CASE STUDY(}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {789-812}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126510}, abstract = {The urban land management process has become one of the most important pillars for the urban sustainable development, so a lot of researches have concerned with studying its components, and most important impediments which affect the efficiency of the outputs of that process. Some of the cities in the Arab Republic of Egypt-including Assiut Citysuffer from urban land management shortage problems, which cause a lot of physical problems impeding the urban sustainable development in those cities, and so those problems were the focus of many planning studies. The paper aims to study the components of the urban land management, and the potentials to apply them in Assiut City, in order to alleviate the urban land management shortage problems. The paper begins with browsing of the physical problems in Assiut City caused from the urban land management shortage, then the concept and the components of the urban land management process, and so the city need for an urban land management system, and the potentials to apply its components in that city, and so reaching to the paper recommendations, which can help in supporting those potentials, to go forward towards the urban sustainable development in Assiut City.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126510.html}, eprint = {https://jesaun.journals.ekb.eg/article_126510_eed57429189915e56508f7131221e98b.pdf} } @article { author = {El-Kadi, Shawkat and A. Mosa, Mohammed. and M. Anas Al-Eryani, Sahar}, title = {THE ROLE OF FINE RESTORATION TECHNIQUES IN MAINTAINING HERITAGE BUILDINGS' ORNAMENTS ( THE ORNAMENTS OF ALAMRYA SCHOOL IN YEMEN, AS AN APPLIED EXAMPLE)}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {813-828}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126512}, abstract = {The technological development in restoration is one of the most important modern pillars that constitute the conservation process for any element of the heritage building elements. As ornaments are very important elements in many heritage buildings; any development in the field of fine restoration techniques, will have a marked effect on ornaments' restoration project in the future. The study aims mainly to identify the role of fine restoration techniques in maintaining heritage buildings ornaments, so as to exhibit the solutions and facilities, these techniques offer, so as to be added to the integrated conservation processes. To achieve the aim of the study, the most important techniques- used in restoring ornaments- are analyzed. While in the second part, Alamiria school in Yemen- one of the conservation processes of heritage buildingsis introduced. Consequently, the ornaments' restoration processes is evaluated from the prospect of current fine restoration techniques.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126512.html}, eprint = {https://jesaun.journals.ekb.eg/article_126512_c993589a33b2487ca20ff34e98f1198e.pdf} } @article { author = {Sabry Elattar, Sherif Mohamed}, title = {ARCHITECTURE DESIGN AND CONSTRUCTION ECONOMICSTHROUGH VALUE ENGINEERING}, journal = {JES. Journal of Engineering Sciences}, volume = {37}, number = {No 3}, pages = {829-843}, year = {2009}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2009.126514}, abstract = {Throughout ages, human Rings have been building to meet the needs of their habitation on this earth. As the products of modem technology replaced the older, outdated tools of these early builders, the methods of construction and the types of skills and specialized knowledge required to complete a construction project had to change to keep pace. The whole process is now greatly influenced by the desire to achieve profit on financial investments as soon as possible and the exploitation of machine technology. In a Design Team there are many people concerned with supplying the design expertise which will make a building possible. Principal Designers generally include architects, interior designers, and building surveyors. They are responsible for the overall design of the project and providing the cost control and financial advice to the client. Unfortunately mistakes can occur during the design phase having serious impact on building life and raising the overall cost of the building. (Overall cost includes the cost of buying, operating, and maintaining the item, service, or system). The degree to which the design of a building embraces maintenance considerations has a major impact on its performance. The performance of buildings is likely to be enhanced if designers are cognizant of maintenancerelated matters. Once a problem and its most probable cause have been properly identified, attention must turn to generating alternative solutions, The greater the number of potential solutions, the more likely that a workable solution will be found. This is where creativity plays a major role. Unfortunately, creativity is often shortchanged. To get more alternatives, new techniques should be used. This research presents Value Engineering (VE) as a systematic and creative methodology that analyzes the function of items, services, or systems to ensure that the required functions are performed at the lowest possible overall cost. It focuses on the applications of VE in the design stage where overall costs can be well controlled and reduced with no impact on value or quality. VE is performed to eliminate or modify any element contributing to the overall cost that is not necessary to maintain the required performance and quality. As a management discipline, VE has been successfully applied and its application may be to systems, equipment, facilities, procedures, methods, supplies, and the like As a value enhancement technique, VM should incorporate sustainability issues as they would affect the economic and quality aspects of the outcome.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_126514.html}, eprint = {https://jesaun.journals.ekb.eg/article_126514_e8c3c341318d7b2a2b2c6d23dea6d408.pdf} }