@article { author = {Faheem, Hamdy and Hassan, Ahmed Mohamed}, title = {2D PLAXIS FINITE ELEMENT MODELING OF ASPHALT-CONCRETE PAVEMENT REINFORCED WITH GEOGRID}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1336-1348}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115106}, abstract = {Geogrid-reinforcement is often used in conjunction with unbound base layers to enhance flexiblepavements performance. This paper presents an axisymmetric finite element (FE) model to analyzethe behavior of unreinforced and geogrid reinforced bituminous pavement subjected to static anddynamic loadings. The model was loaded with an incremental loading and the critical pavementresponses such as effective stress and vertical surface deflection were determined for unreinforcedand geogrid reinforced flexible pavement. The results indicated that during static loading, amoderate effect on the pavement behavior was observed due to the reinforcing geogrid layer. Thiseffect was not noted in case of dynamic loading. The effect of dynamic loading frequency onpavement settlement was significant especially for high loading amplitudes. The results also showedno significant improvement in pavement system behavior was obtained by adding another layer ofgeogrid reinforcement.}, keywords = {Geogrid, Pavement Performance, Plaxis Program, FE Analysis,flexible pavement,Reinforced Pavement,Dynamic loading}, url = {https://jesaun.journals.ekb.eg/article_115106.html}, eprint = {https://jesaun.journals.ekb.eg/article_115106_2a587f2cc1971760ac08e753b4975b8a.pdf} } @article { author = {Ahmed, Hassan Youness and Hashem, Mostafa Deep and Rashwan, Naglaa Kamal and Abdalla, Samir Azmy}, title = {INVESTIGATION OF AGGREGATE PARTICLES SHAPE ON CHARACTERISTICS OF HOT MIX ASPHALT}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1349-1366}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115110}, abstract = {This research represents a laboratory study of the effect of the aggregate shape in HMA. The shape ofaggregates particles is not the only factor of aggregate characteristics which effect on HMA. OtherParameters such as aggregate gradation and aggregate surface texture are also effect. The aggregateshapes considered for the study were cubical, disk and blade shapes. Two aggregate surface textures usedin the mix which were smooth and rough particles. The aggregate gradations used in the mixtures weremaximum, medium and minimum gradation .Shape of aggregate was determined through two methods.The first method was an image measurement of coarse aggregate while the second method was particleshape index. Marshal tests and indirect tensile test were performed to investigate the different inbehaviors of different samples with different parameters considered in this study taking into account thatthe control mix contains crushed gravel, rough aggregate particles with disk shape, medium gradation ofaggregate and 4% of limestone powder as mineral filler.The results showed that using of cubical aggregate shape increased each of Marshall Stability, bulkdensity, Marshall Stiffness, Marshall Quotient, Stiffness Modulus and the Indirect Tensile Strengthof the mix than disk and blade shapes while decreased each of flow and air voids. The results also,showed that medium gradation of aggregate had good results than other gradations. By using roughparticles the values of ITS and stiffness modulus were higher than using smooth particles}, keywords = {HMA,Aggregate,Aggregate shape,Gradation and Mineral filler}, url = {https://jesaun.journals.ekb.eg/article_115110.html}, eprint = {https://jesaun.journals.ekb.eg/article_115110_de2f7b1b30fb232be2bd872a7f026175.pdf} } @article { author = {Rashwan, Mohamed M. M. and Diab, Hesham M. A. and Gad, Ahmed Fouad Abdullah}, title = {ELEVATED TEMPERATURE RESISTANCE CONCRETE USING NON-TRADITIONAL MATERIALS}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1367-1377}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115112}, abstract = {The properties of materials used in preparing concrete play an important role on the performance of concrete during its lifetime. Concrete generally provides adequate fire resistance for most applications. However, the strength and durability properties of concrete are significantly affected when subjected to elevated temperature. Terrorist attack, accidental fire breakout and different type of explosions produce a rapid change of temperature for a short period. This study was focused on improving the elevated temperature resistance of normal concrete by using Ground Granulated Blast Furnace Slag (GGBFS) as cement replacement and fine aggregate replacement and Brick Break (BB) as coarse aggregate replacement. Different replacement percentages of GGBFS and BB were used in this study (10%, 20% and 30%). Percentage of GGBFS replacement was calculated based on the dry weight of cement material, while the percentage of BB was calculated based on the weight of coarse aggregate. Nine mixes in additional to the reference concrete mix (25 MPa) considered in this study were exposed to high temperatures of 300, 600 and 800°C. Moreover, cooling system effect of heated concrete cubes have been investigated through two cooling procedure [Air cooling and Water cooling (quenching)].Physical and mechanical properties of the developed mixes including residual compressive strength, mass losses, adsorption, and water absorption have been determined. Test data indicated that high temperature caused significant deterioration in the properties of concrete; the addition of GGBFS and BB could all effectively improve the residual compressive strength of concrete. For all series there is decrease in compressive strength with increase in temperature this decrease reached to 50% for control mix at 800°C in case of slow cooling in air, however the residual compressive strength was 65 and 60% for mixes containing GGBFS and BB respectively}, keywords = {Concrete,Elevated temperature,Cooling,Replacement materials,Ground granulated blast furnace slag,Brick Break,Compressive strength}, url = {https://jesaun.journals.ekb.eg/article_115112.html}, eprint = {https://jesaun.journals.ekb.eg/article_115112_090ab3958c4463e7b95f86985cc5045d.pdf} } @article { author = {Youness, Hassan Ali Hassan Ahmed}, title = {DESIGNING AN ARCHITECTURE LEVEL MODEL FOR MULTI-CORE SYSTEMS}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1378-1391}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115115}, abstract = {The Architecture Level Model (ALM) as a design in space exploration in the early phases of the design process can have a dramatic impact on the area, speed, and power consumption of the resulting systems. A multi-core system is an integrated circuit containing multiple processor cores that implements most of the functionality of a complex electronic system and some other components like FPGA/ASIC on a single chip. In this paper, we present a new approach to synthesize multi-core system architectures from Task Precedence Graphs (TPG) models. The front end engine applies efficient algorithm for scheduling and communication contention resolving to obtain the optimal multi- core system architecture in terms of number of processor cores, number of busses, task-to-processor/channel-to-bus mapping, optimal schedule, and Hardware/Software partition. The back end engine generates a System C simulation model using a well-known commercial tool model generation library to form the architecture level model. The viability and potential of the approach is demonstrated by a case study.}, keywords = {ALM,Multi-core,System C,TPG,MPSoC,TLM}, url = {https://jesaun.journals.ekb.eg/article_115115.html}, eprint = {https://jesaun.journals.ekb.eg/article_115115_e3cb74d1f5fc41b4bedbffbd639abd52.pdf} } @article { author = {El Metaafy, Hosny and Mohana, Mahmoud and Gomaa, Ali and Yacoub, Mamdouh Shaker and Kassem, Gamal}, title = {A PROPOSED DESIGN OF UWB MONOPOLE ANTENNA AND ITS LINEAR ARRAYS}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1392-1413}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115131}, abstract = {A proposed design of ultra-wideband (UWB) monopole antenna has been presented to cover frequency range 2.49–14.42 GHz with small size. An equivalent circuit model with the parameter values of the optimized UWB antenna has been modeled. Moreover, a compatible lumped-elements utilized in equivalent circuit modeling for the proposed monopole antenna is established using the Advanced Design System (ADS). An UWB feeding network circuit has been designed in order to be used for exciting 2x1 and 4x1 linear antenna array. The measured and simulated results for the proposed feed network has a good return loss, isolation and power division ratio at all ports within the whole UWB frequency range. Two and four element UWB linear antenna arrays are presented. The average gain for the two-element antenna array is about 5.3 dBi and reaches to7.15 dBi for the four-element antenna array, over the whole UWB frequency range. A good agreement between the measured and the simulated results of all parameters for the antenna element and antenna arrays is appeared.}, keywords = {monopole antenna,Ultra-wide band,antenna array,Power divider,stubs matching}, url = {https://jesaun.journals.ekb.eg/article_115131.html}, eprint = {https://jesaun.journals.ekb.eg/article_115131_6675dc529a898346c16d5617a50554de.pdf} } @article { author = {El-Soghiar, Mohamed S. and El-Dosoky, Mohamed F. F. and Abdel-Rahman, Ali K. and Mohamed, Hany A. and Morsy, Mahmoud G.}, title = {PERFORMANCE STUDY OF A MODIFIED RANQUE-HILSCH VORTEX TUBE}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1414-1429}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115133}, abstract = {In the present work, a Ranque-Hilsch vortex tube (RHVT) is modified by suggesting a novel vortex chamber at inlet. The performance of the modified vortex tube is studied experimentally. Suggested lengths for the vortex chamber are 10, 15, and 20 mm and the vortex chamber diameters are 12, 16, and 20 mm. All vortex chambers with different lengths and diameters are tested experimentally at variable inlet conditions. It's found that the vortex chamber diameter has a dominant effect on the performance compared with the vortex chamber length. The results are compared with that obtained by a conventional vortex tube. The results show that the vortex chamber gives an enhancement in the isentropic efficiency reach to 15.9 %. The results for a vortex chamber of 15 mm length and 20 mm diameter has the best performance.}, keywords = {vortex tube,vortex chamber}, url = {https://jesaun.journals.ekb.eg/article_115133.html}, eprint = {https://jesaun.journals.ekb.eg/article_115133_7fa82a98aa5c63e661c43cedfeeb3eb8.pdf} } @article { author = {Mahmoud, A E and Wasly, H S and Doheim, M A}, title = {STUDIES OF CRYSTALLITE SIZE AND LATTICE STRAIN IN AL-AL2O3 POWDERS PRODUCED BY HIGH-ENERGY MECHANICAL MILLING}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1430-1439}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115136}, abstract = {In the present study mechanical milling used to form nanocrystalline structure in Al-Al2O3 powders. The microstructure of the milled powders was investigated by X-r ay diffraction (XRD) analysis. It was found that the XRD peaks showed a significant broadening, which was related to grain refinement and lattice distortions. X-ray patterns were analyzed using Williamson–Hall treatment to determine the crystallite size and the lattice strain. nanocrystalline powders have been synthesized with microstructure showing a higher lattice strain and an evolution of the finest particles. Microhardness measurements and compression tests were performed to characterize the composite materials.}, keywords = {XRD,Williamson–Hall,Al-Al2O3,Nanocomposites}, url = {https://jesaun.journals.ekb.eg/article_115136.html}, eprint = {https://jesaun.journals.ekb.eg/article_115136_a536a27847f7595a6ee48a94f95acf21.pdf} } @article { author = {Ali, Khaled Salah el-din}, title = {BUILDING TECHNOLOGIES USED FOR THE OUTER ENVELOPE OF BUILDINGS AND THEIR IMPACT ON ENERGY CONSERVATION}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1450-1461}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115137}, abstract = {Recently, the establishments of buildings that depend on environmental polluting power have widely spread. This helped in widening the gap between sources of organic power and new renewable power used in buildings, especially the administrative buildings as it consumes a great amount of power during its execution and operation.The problem of power crisis and its consumption in administrative buildings is considered the main motive for the researcher to study building techniques used in the external coating for these buildings trying to rationalize the used power. It is also a method of reducing voltage and reducing using mechanical methods for cooling in summer and warming in winter.Within this frame, the research deals with studying the techniques of building used in establishing the external coating for administrative buildings and its impact on rationalizing the power at hot tropical ones, besides the architectural treatment that suits these zones as an introduction for developing the process of establishing these buildings.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_115137.html}, eprint = {https://jesaun.journals.ekb.eg/article_115137_13e1f3549d7f973560c2c6ca3ed1abeb.pdf} } @article { author = {Ahmed, Mohamed Nabil and Mousa, Mohamed Azmy Ahmed and Djais, Azza Mohamed}, title = {A study and an Analysis of the Experiment of New Assiut City In the Provision of Appropriate Low-income Housing "An Assessment of the project (Build your Home) as one of the main pivots of the National Housing Project"}, journal = {JES. Journal of Engineering Sciences}, volume = {42}, number = {No 6}, pages = {1462-1491}, year = {2014}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2014.115139}, abstract = {The problem of housing in Egypt is an exacting problem that faces all the strata of the society. It has accumulated over ages due to the bad economic, social and political conditions in Egypt since mid-twenties. The problem of low-income housing is considered one of the greatest problems facing the governments of developing countries particularly Egypt. This is due to the fact that most Egyptians have low earnings.The National Housing Project is considered one of the most important available projects to provide convenient houses for youths. It aims at constructing 500, 000 apartments in the new cities and governorates over a span of six years. This amounts to the construction of 85,000 apartments per year to solve the housing problem.The paper deals with the study and the analysis of the Experiment of New Assiut City in the provision of appropriate low-income housing and an evaluation of the role of the project 'Build Your Home' in the provision of low-income housing. It represents a new style of housing with particular criteria and characteristics that suit those with low earnings. It has been also initiated with new financing measures in an attempt on the part of the government to open up an access for those with low earnings to the housing market. A study of the project in its area of construction has been conducted. The opinions and comments of the dwellers and the organizations concerned have been pursued to check on the participation of 'The New Assiut City' in the provision of low-income housing. The aim of the study also is to see how far the project is suitable for the present and the future needs of the dwellers.The study ends up with some results reached after thorough theoretical and field studies. It has also come up some recommendations of paramount importance that will open new horizons for future strategies to actualize the role of these new cities in the provision of low-income housing and to limit the housing crisis.}, keywords = {Low-Income housing,the National Housing Project,the project (Build your Home),New Assiut City,Egypt}, url = {https://jesaun.journals.ekb.eg/article_115139.html}, eprint = {https://jesaun.journals.ekb.eg/article_115139_b4ddd8704c6bb54975d79a073e96b745.pdf} }