@article { author = {Abdelhafiz, Ahmed A.}, title = {3D HERITAGE DOCUMENTATION}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {959-968}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114432}, abstract = {Nowadays, realistic 3D models are achieved from high resolution texture warped to laser scanner meshes. Multiple photos are normally required for texture mapping, so many manual processes have to be implemented which are absolutely time consuming especially in large sites. The challenge is to handle these processes automatically by developing suitable algorithms. Therefore we focus here on a developed algorithm for automatic texture mapping with its corresponding software. The recent techniques are then used to recover a complete 3D model for paintings inside the Domitilla catacomb which is the largest catacomb in Rome. Such models will help archaeologists to virtually reach the catacomb without putting their feet underground and accordingly conduct their own research}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_114432.html}, eprint = {https://jesaun.journals.ekb.eg/article_114432_095f3c91c0d48a5d7e07bd9bf6224eff.pdf} } @article { author = {Ahmed, Mohamed M. and Diab, Hesham and Drar, Ahmed Attia M.}, title = {SHEAR BEHAVIOUR OF HIGH STRENGTH FIBER REINFORCED CONCRETE CORBELS}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {969-987}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114468}, abstract = {An experimental study of shear behaviour of high strength reinforced-concrete corbels with and without fibers was investigated. Seventeen high strength reinforced-concrete corbels were tested. The test variables were steel fiber content (Vf%), shear span-to-depth ratio (a/d), concrete strength (fcu), area of main steel reinforcement (Asm) and presence of horizontal stirrups. Test results showed that, addition of steel fibers or/and horizontal stirrups improves both shear strength and ductility of the tested corbels, and results in a more ductile failure mode. Test results were compared with shear strength predicted using ACI 38-08 equations and those proposed by other investigators. Comparison between the experimental and the predicted values of shear strengths showed that the model proposed by G. Campione et.al. [1], satisfactory predicted the ultimate load for high strength fiber reinforced-concrete corbels.}, keywords = {Fiber reinforced concrete,high-strength concrete,Steel fibers,Shear behavior,Shear Strength,Corbels}, url = {https://jesaun.journals.ekb.eg/article_114468.html}, eprint = {https://jesaun.journals.ekb.eg/article_114468_204256f1d3bb3907c09a411ebab3c397.pdf} } @article { author = {Moustafa, Yasser G. and Farrag, Farrag A. and Abdelhafiz, Ahmed A. and Abd Elwahed, Abdelaal M.}, title = {THE POTENTIALS OF SATELLITE IMAGES FOR MAP UPDATING WITH EMPHASIZES ON EGYPT SAT-1 IMAGES}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {989-1003}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114470}, abstract = {The lack of adequate maps is one of the critical issues to be handled in developing countries. The main problem is the rapid development of urban areas, so that maps are out of date very fast. Consequently, nearly all these maps have to be revised and updated as soon as possible. Recently, due to the improvement in satellite technology, remote sensing data is applied for mapping and map updating at different scales. On April 17, 2007 the first Egyptian earth observation satellite Egypt Sat-1 was launched. The available images from Egypt Sat-1 satellite provides valuable source of remote sensing data in Egypt. This paper aims to evaluate the potential of Egypt Sat-1 images versus other satellite images for maps updating. Data used in this study are satellite images from Egypt Sat-1, SPOT 4, IKONOS and topographic map at scale 1:25,000. The methodology focuses on visual comparison of the images over the test area for specific features such as roads, railways, watercourses and boundaries of urban areas. After that an investigation is carried out for the potential of the information content in Egypt Sat-1 images, for updating 1:25,000 map. The results of these evaluations show that Egypt Sat-1 images, from the point of geometric accuracy, have the capability of 1:25,000 scale maps revision. Also, from the point of information content, it have the capability of revision of the main features such as building blocks, roads and vegetation cover. Revision of other objects in Egyptian 1:25,000 scale maps that are problematic in their identification and extraction from Egypt Sat-1 images can be completed using other mapping methods.}, keywords = {Egypt Sat-1,Information Content,Feature Extraction,Map Revision}, url = {https://jesaun.journals.ekb.eg/article_114470.html}, eprint = {https://jesaun.journals.ekb.eg/article_114470_2209b8944d5fc77088ed47bf66a122fa.pdf} } @article { author = {Heniegal, Ashraf M.}, title = {BEHAVIOUR OF UNDERWATER SELF COMPACTING CONCRETE}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1005-1023}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114472}, abstract = {Antiwashout underwater concrete AWA may be considered for use in a diverse range of work underwater, where its excellent characteristics are of great advantage. Underwater concrete Anti-washout admixture (SIKAMENT 100 SC) is water soluble organic polymers, which increase the cohesion of the concrete in a way, that significantly reduces the washout of the finer particles, i.e. the cementinious material (cement and silica fume) and sand from fresh concrete when it is placed underwater. Researches for underwater concrete are commonly studied but the common mixes of SCC are rarely investigated underwater. In this research, about 50 mixes of normal concrete NC and self compacting concrete SCC were prepared, in order to study the behaviour of under water SCC compared to NC using antiwashout admixtures (SEKAMENT 100 SC) Some parameters were studied such as AWA%, cement content, water cementitious ratio, coarse to fine aggregate ratio, and superplastisizer percent, in order to study the behavior of underwater SCC by measuring washout and out water/underwater minimum relative compressive strength to be added to the guidelines of underwater concrete applications. Optimum values of some AWA components have been clarified; including cement content, water cementitious ratio, sand to aggregate ratio, and superplastisizer percentage.}, keywords = {Antiwashout,Compressive strength,Self compacting concrete,Underwater,washout}, url = {https://jesaun.journals.ekb.eg/article_114472.html}, eprint = {https://jesaun.journals.ekb.eg/article_114472_a6d45778663b70b310c991ddd52ebc17.pdf} } @article { author = {Bady, Mahmoud and Manaa, Hassanien and Kamal El- Dean, Adel M. and Hussein, A. M}, title = {STUDY OF WASTE WATER TREATMENT MEANS IN ASSIUT THERMAL POWER PLANT}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1025-1037}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114474}, abstract = {In the present study's course; the reduction of wastewater effluents (by recycling as raw water supplies, classifying and arrangement between the incoming wastewaters), the treatment of the wastewater effluents (by evaporation and aeration) and the using of the treated effluents for irrigation purposes, has led to, the corresponding operating time of the waste water treatment unit (WWTU), the amount of chemicals such as acids, alkalis, ferric chloride (FeCl3) and polyelectrolyte and the discharged treated wastewater to the River Nile are reduced which has a positive impact on the environment through: Reduction of the amount of Total Dissolved Solids (TDS) discharged to the River Nile, the electrical energy consumed which reduces the pollution associated with its production and the air pollution with SOx and mercury (Hg) dissolution due to the reduction of sulfuric acid, hydrochloric acid and sodium hydroxide used, in addition, Egyptian Environmental Legal Wastewater discharge Regulations are obeyed.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_114474.html}, eprint = {https://jesaun.journals.ekb.eg/article_114474_20e52fc2aaae7b8d7da6992be371443e.pdf} } @article { author = {Zohir, A. E. and Gomaa, A.G.}, title = {ENHANCEMENT OF HEAT TRANSFER THROUGH A SUDDEN EXPANSION PIPE AIRFLOW USING PROPELLER SWIRL GENERATOR}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1039-1055}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114476}, abstract = {This investigation is aimed to study the heat transfer and pressure drop characteristics for turbulent airflow in a sudden expansion pipe (d/D = 0.72) equipped with propeller swirl generator with different blade angles. The investigation is performed for the Reynolds number ranging from 10,000 to 40,000 under a uniform heat flux condition. Four propeller fans of five blades with swirl angles, Ө = 15, 30, 45° for upstream flow, and 45° for downstream flow are inserted separately inside the test section. The swirl propeller fan is located at different locations inside the tested pipe, where S =10H, 20H and 40H for both upstream and downstream flows. The experimental results indicate that inserting the propeller upstream of the tube provides considerable improvement of the heat transfer rate up to 190% for all swirler angles with higher values obtained at Ө = 45°. Inserting the propeller downstream of the tube provides more improvement in heat transfer rate than inserting the propeller upstream of the tube at swirl angle of Ө = 45°, the heat transfer rate increased up to 225%. The maximum enhancement efficiency (η) for the downstream swirler is about 326% while it is about 213% for the upstream one. Correlations for relative mean Nusselt number and enhancement efficiency are presented for different fan locations, swirl angles and Reynolds numbers.}, keywords = {Sudden Expansion,Swirl flow,Heat transfer augmentation}, url = {https://jesaun.journals.ekb.eg/article_114476.html}, eprint = {https://jesaun.journals.ekb.eg/article_114476_e1ad500627363daea584624cf3f2389b.pdf} } @article { author = {Abd-Elrhman, Y. M. and Abouel-Kasem, A. and Ahmed, S. M. and Emara, K.M.}, title = {STEPWISE EROSION AS A METHOD FOR INVESTIGATING THE WEAR MECHANISMS AT DIFFERENT IMPACT ANGLES IN SLURRY EROSION}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1057-1074}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114477}, abstract = {In the present work, stepwise erosion technique was carried out to investigate in detail the influence of impact angle on the erosion process of AISI 5117 steel. The impact sites number and their morphology at different impact angles were investigated using SEM examination and image analysis. In addition, the SEM images of eroded surface using stepwise technique were used presented for better understanding of material removal at different angles. The tests were carried out with particle concentration of 1 wt %, and the impact velocity of slurry stream was 15 m/s. Silica sand has a nominal size range of 250 – 355 µm was used as an erodent, using whirling-arm test rig. The results showed that the number of craters as expected increases with the increase in the mass of erodent for all impact angles and that this number decreases with the increase of the impact angle. In addition, the counted number of craters is larger than the calculated number of particles for all impact angles and at any stage. The effect of impact angle based on the impact crater shape can be divided into two regions; the first region for θ ≤ 60o and the second region for θ ≥ 75o. In the first region the length of the tracks decreases with the increase of impact angle. The calculated size ranges from few micrometers to 100 micrometer for the first region and to 50 micrometers in the second region. Chipping of the former impact sites by subsequent impact particles plays important role in developing erosion.}, keywords = {Slurry erosion,Impact angle,Number of impact sites,Eroded surface,Erosion mechanisms,AISI 5117steel,Particles rebound effect}, url = {https://jesaun.journals.ekb.eg/article_114477.html}, eprint = {https://jesaun.journals.ekb.eg/article_114477_ed3f04dcc441726303768655fe7207bd.pdf} } @article { author = {Huzayyin, Ahmed and El-Batsh, Hesham and Nada, Sameh and Seyam, Shaimaa}, title = {EXPERIMENTAL AND NUMERICAL INVESTIGATION OF A CONDENSATION REPELLENT RADIANT COOLING PANEL SYSTEM}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1075-1089}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114478}, abstract = {Radiant cooling panels (RCP) use controlled-temperature surfaces to provide heat transfer mainly by radiation. In this study, the performance of RCP system is investigated using experimental measurements and numerical calculations. In the experimental study, a radiant cooling panel system equipped with cooling coils was examined in a vacant room. The power consumption, condensation rate and thermal comfort were studied experimentally. A numerical model was also employed to study flow pattern inside the room and to predict temperature distributions. The flow field was obtained by solving the flow governing equations namely continuity, momentum and energy equations. The turbulent flow was solved by using Re-Normalization Group RNG k-ε turbulence model. Heat transfer by radiation was modeled using Discrete Ordinates DO radiation model. The effect of the radiant panel surface temperature and exit air temperature from the panel were studied. The results showed that the used numerical technique could predict temperature distribution in the room with reasonable accuracy. It was found through this study that RCP provide thermal comfort and is energy efficient.}, keywords = {Radiant cooling panel,Numerical Techniques,experimental measurements,thermal comfort}, url = {https://jesaun.journals.ekb.eg/article_114478.html}, eprint = {https://jesaun.journals.ekb.eg/article_114478_3cd5a2c0c0f5f83fdac572e23b865f3d.pdf} } @article { author = {Mohamed, Hany A. and Omara, Mohamed A. and Ahmed, Mahmoud S. and Abdeen, Mohamed F.}, title = {EXPERIMENTAL STUDY OF NATURAL CONVECTION HEAT TRANSFER THROUGH HORIZONTAL OPEN ENDED EQUILATERAL TRIANGULAR CHANNELS}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1091-1103}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114481}, abstract = {Experimental study of natural convection heat transfer inside smooth and rough surfaces of horizontal equilateral triangular channels with a uniformly heated surface are performed. The effect of smooth and rough surface of average roughness, ra = 0.02μm, on the heat transfer characteristics are studied. The local and average heat transfer coefficients and Nusselt number are obtained for smooth and rough channel at different Rayleigh numbers from 6.45 × 105 to 4.45 × 106. The findings show that the values of temperature difference between the inside surface and ambient air increase with increase of axial distance from both ends of the channel until a maximum value at the middle of the channel. The results show a higher values of local (Nux) for rough channel along the axial distance compared with the smooth channel. The average Num of rough channel is higher than Num of smooth channel by about 7%. The results obtained are correlated using dimensionless groups for both rough and smooth surfaces of the equilateral horizontal triangular channels.}, keywords = {Natural convection,Constant Heat Flux,Horizontal Triangular Channels,Rough surface,Smooth surface}, url = {https://jesaun.journals.ekb.eg/article_114481.html}, eprint = {https://jesaun.journals.ekb.eg/article_114481_525e9cc5d67bc2b1e09b37ec2fceb8eb.pdf} } @article { author = {Thabet, A.}, title = {EXPERIMENTAL MEASUREMENTS FOR SPACE CHARGE RELAXATION IN NOVEL PVC THIN FILM NANO-COMPOSITES}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1105-1120}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114482}, abstract = {Space charge formation in a nano-composite thin film under dc stress at various temperatures was observed using the pulsed electro-acoustic (PEA) method. The Polyvinyl Chloride (PVC) /(Clay, Fumed Silica, and ZnO) nano-composite materials, which are made of Polyvinyl Chloride (PVC) mixed with each one of Clay, Fumed Silica, and ZnO nano-size filler, have changed their electrical properties than that in pure Polyvinyl Chloride. Therefore, the materiasls are expected to be used with smaller thickness as an insulator in the same dc applications. However, it is necessary to study the space charge characteristics, therefore, we tried to investigate the space charge formation in thin film of Polyvinyl Chloride (PVC) / (Clay, Fumed Silica, and ZnO) nano-composite materials under dc electric field at various concentrations of nanofillers and dc voltages using PEA system. From the experimental results, it was found that the space charge formation was strongly affected by the Clay, Fumed Silica, and ZnO contents in their nano-composites.}, keywords = {Space charge,nano-composite,PEA system,polymers,insulation,Nanoparticles}, url = {https://jesaun.journals.ekb.eg/article_114482.html}, eprint = {https://jesaun.journals.ekb.eg/article_114482_ab32191490282aa264e7b6cabce57f0c.pdf} } @article { author = {Hassan, A. A. and Kassem, Ahmed M.}, title = {SPEED CONTROL DESIGN OF A PMSM BASED ON FUNCTIONAL MODEL PREDICTIVE APPROACH}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1121-1135}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114483}, abstract = {This paper investigates the application of the model predictive control (MPC) approach to control the speed of a permanent magnet synchronous motor (PMSM) drive system. The MPC is used to calculate the optimal control actions including system constraints. To alleviate computational effort and to reduce numerical problems, particularly in large prediction horizon, an exponentially weighted functional model predictive control (FMPC) is employed. In order to validate the effectiveness of the proposed FMPC scheme, the performance of the proposed controller is compared with a classical PI controller through simulation studies. Obtained results show that accurate tracking performance of the PMSM has been achieved.}, keywords = {Predictive Control,functional model predictive control,permanent magnet synchronous motor}, url = {https://jesaun.journals.ekb.eg/article_114483.html}, eprint = {https://jesaun.journals.ekb.eg/article_114483_789d8b6d508a4ae751a3891770bfadf4.pdf} } @article { author = {El-Garhy, Ahmed M. and Anees, Besada A. and El-Adawy, Mohamed I.}, title = {CONVENTIONAL AND EVOLUTIONARY CONTROL SCHEMES FOR SPRING-ROLL DIELECTRIC ELASTOMER ACTUATOR}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1137-1156}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114484}, abstract = {To control the actuation of the spring-roll dielectric elastomer actuator, the required actuation and dimensionless axial force (load) should be prescribed. Required actuation can be considered as a set point of the control system. In this paper different conventional and evolutionary controllers have been proposed, PID, Fuzzy, PID-Fuzzy average, particle swarm optimizing algorithm based PID. The performance of all these controllers have been addressed in terms of steady state error, maximum overshoot, and time consumed for the sake of qualitative comparison. To control the actuation of the spring-roll dielectric elastomer actuator, the charges pumped by the voltage supply should be controlled. A unity feed back control system is used. The response of each control system is derived and the choice of the more suitable controller is an application dependent, where some applications need zero steady state error while others need fast response. Spring-roll dielectric elastomer voltage supply and control system are based upon optimal design parameters derived in [1, 2]. The results of the conducted simulation experiments proved that all developed control systems are robust and help the usage of the spring-roll dielectric elastomer as a structural unit of an active artificial muscle.}, keywords = {Spring-roll dielectric elastomer actuator,PID controller,PSO based PID controller,Fuzzy controller,PID-fuzzy average controller}, url = {https://jesaun.journals.ekb.eg/article_114484.html}, eprint = {https://jesaun.journals.ekb.eg/article_114484_2d504dfb2958174b2b11dca60188fd25.pdf} } @article { author = {Mobarak, Youssef A.}, title = {FACTS IMPACTS ON INDUCTION GENERATOR DRIVEN BY WIND TURBINE}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1157-1178}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114485}, abstract = {This paper presents the effect of the combination between SVC and STATCOM on the performance of an induction generator driven by wind turbine. Also the comparison is made between the performances of the wind farm equipped by SVC, STATCOM and the combination in between them to improve the wind farm power system performance. The simulation results show that both of the devices enhance the power system performance during and after disturbance, especially when the network is weak. The results show the effect of the combination between SVC & STATCOM connected on bus #3. The combination between SVC & STATCOM enhances the power system performance.}, keywords = {Induction Generator,FACTS,Wind turbine}, url = {https://jesaun.journals.ekb.eg/article_114485.html}, eprint = {https://jesaun.journals.ekb.eg/article_114485_d1263ee35390f966892e04301c093ff8.pdf} } @article { author = {Kassem, Ahmed M. and Yousef, Ali}, title = {FUZZY-LOGIC BASED SELF-TUNING PI CONTROLLER FOR HIGH-PERFORMANCE VECTOR CONTROLLED INDUCTION MOTOR FED BY PV-GENERATOR}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1179-1193}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114486}, abstract = {In this paper, speed control of an induction motor (IM) fed by a photovoltaic (PV) generator based on a direct proportional and integral controller and an adaptive fuzzy logic controller (AFLC) is presented. Also In this study, it is proposed that the PV output voltage is varies between certain cut in and cut off values that to extract maximum power during different solar irradiation values instead of operating the motor with constant voltage. To decrease the system cost, it is proposed that the system does not contain storage batteries and there is no need for DC/DC converter where, variable voltage of PV generator is considered. The motor speed is controlled to track a certain reference values using the proposed controller. In addition, an efficient vector controller that can achieve high accuracy and a fast dynamic response of the induction machine is presented. Also, In order to validate the effectiveness of the proposed adaptive fuzzy PI (AFPI) controller scheme, the performance of the induction motor with the proposed controller was compared with classical PI controller. Obtained simulation results show that accurate tracking performance of the induction motor is achieved with variations of both PV generator output voltage and the load torque.}, keywords = {photovoltaic generator,Vector control,adaptive fuzzy logic control,PI control,Induction motor}, url = {https://jesaun.journals.ekb.eg/article_114486.html}, eprint = {https://jesaun.journals.ekb.eg/article_114486_b34a2dac727c81d9ed9b702a19bbdd4c.pdf} } @article { author = {Ali, M. Abd El-Hameed and Waheed, M. El Sayed and Hanafy, Ibraheem M. and Ahmed, M. Ali}, title = {PERFORMANCE ANALYSIS OF ULTRA WIDEBAND MEDIA ACCESS CONTROL PROTOCOL PROVIDING TWO CLASS TRAFFIC}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1195-1215}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114487}, abstract = {UWB (Ultra wideband) technology has a huge potential for revolutionizing the world of digital communications, particularly wireless communications that based primarily on the impulse radio paradigm. UWB technology was originally seen purely as a physical layer technology, with no or little protocol to control the communication. It is now clear that Media Access Control (MAC) features play a major role in UWB communication systems. In this paper, a communication system is considered with a small number of geographically separated nodes in UWB ad hoc networks. An active node can be in one of two possible classes (H,L); high priority or low priority class, depending on its nature and / or the type of information that it desires to transmit. Nodes in class-H are given some priority over those in class-L. The motivation comes from the observation that, in the absence of a sophisticated equalizer, the size of a slot for transmitting a UWB pulse is typically dictated by the Delay Spread of the channel which amounts to 60 ns in indoor environments. Therefore, using a wider frequency band to shorten the transmission time for each pulse may not increase the data rate in proportion to the available bandwidth. Thus, a multiband approach is considered to better utilize the available spectrum, where each transmitter sends longer pulses in one of many narrower frequency bands. Measures of system performance including throughput, average delay and bit error rate will be presented in single band and multiband approaches. Additionally, there is a comparison between numerical results and how they are achieved by simulation of the entire system providing two priority classes.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_114487.html}, eprint = {https://jesaun.journals.ekb.eg/article_114487_d386c4133443efe5b016c3bc5761a5b9.pdf} } @article { author = {Abdel Haffez, Gamal S.}, title = {OPTIMIZATION OF THE OPERATING PARAMETERS AFFECTING DAVIS TUBE MAGNETIC TESTER USING 2ND FACTORIAL DESIGN}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1217-1231}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114489}, abstract = {The current practice of assessing the efficiency for recovery of magnetite by Davis tube tester at a magnetic induction is very important. 2nd factorial design is used for the parametric study of the magnetic separation because the classical approach is a tedious method. Factorial design is the most efficient way to explore the combinations of variables, because it uses every observation and calls only for as many observations as necessary. The results of the factorial experiments were used to identify the variables having a significant effect on magnetite recovery. The main objective of this work is to upgrade the iron ore using the Davis tube magnetic tester. It is also intended to study the most important operating parameters affecting the separation process. Among these are the feed size (µm), current intensity (Amp.), tube oscillation (rpm), tube inclination (degree) and wash water rate (Liter min-1). Consequently, the best fit relation can be expressed mathematically as: Y = 58.99 + 7.25X + 4.56I - 1.49O - 2.19W - 1.84S}, keywords = {Davis tube magnetic tester,2nd factorial design,Iron ore concentration and MINTAB14}, url = {https://jesaun.journals.ekb.eg/article_114489.html}, eprint = {https://jesaun.journals.ekb.eg/article_114489_72763a2382dd013e65aff69ab6f55ff0.pdf} } @article { author = {Abouelfadl, Somaya}, title = {GLOBAL WARMING – CAUSES, EFFECTS AND SOLUTION'S TRIALS}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1233-1254}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114490}, abstract = {This research studies the global warming problem- resources, effects and solutions. The resources are resembled in the green house gas emissions and the share of different regions in them. The effects on the world in general are resembled in threats of land losses for low level areas beside or near water, climatic emigration, diseases spread in different areas etc., For the Arab region the threat of coastal areas under sea water accompanied with the necessity of rehabilitation of big numbers of people who will lose their homes, works, lands..etc especially in Nile delta region. The research shows some strategies and projects to reduce the global warming problem and its effects. One strategy is to capture of green house gas emissions, one of the projects is the biggest solar project in the world in the great Sahara. Other projects are renewable energy projects in the Arab world and projects to reduce the global warming effects especially on Egypt. The research mentions some international agreements around this subject and suggests some marks on the way of solution.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_114490.html}, eprint = {https://jesaun.journals.ekb.eg/article_114490_226775010d157722f61b8a3c837cd147.pdf} } @article { author = {Othman, Fatma Othman Mohamed}, title = {THESES FOR DEVELOPMENT A LOCAL SUSTAINABILITY ASSESSMENT TOOL FOR ARCHITECTURE AND BUILT ENVIRONMENT - A STUDY OF GLOBAL SUSTAINABLE ASSESSMENT TOOLS.}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1255-1274}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114491}, abstract = {Sustainability of architecture and urbanism issue is an important subject of concern of architects and planners worldwide. They are looking for achievement superior project, not only to achieve utility, economy, beauty, and durability, but also to achieve sustainability, as it seeks to reduce energy consumption, and reduce the adverse environmental effects, to give opportunity of better live for future generations. The presence of a standard accurate is considered one of the most tools and means to measure the sustainability of the building , site, or city, This helps the designers as a reference and tool to design , construction , and manage environmentally friendly building , Also it share develop practices environmentally responsible.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_114491.html}, eprint = {https://jesaun.journals.ekb.eg/article_114491_5dba0f36378a0a6c0d89be2d0862fba9.pdf} } @article { author = {Saber, Nermeen Ezz Eldeen and Mosa, Mohamed Azmy Ahmed and Habib, Tarek Galal and Abdel Karim, Nady Mostafa}, title = {The APPLICATION OF SUSTAINABLE DEVELOPMENT CONCEPT IN URBAN PLANNING. CASE STUDY: ISMAILIA CITY – EGYPT}, journal = {JES. Journal of Engineering Sciences}, volume = {40}, number = {No 4}, pages = {1275-1282}, year = {2012}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2012.114492}, abstract = {Sustainable development needs to be made as a reality and not a concept. It is about ordinary people’s lives and all of us need to get that message across. Sustainable development is the way to better quality of life. It is the idea of achieving sociai progress, high and stable levels of economic growth and employment environmental protection and prudent use of natural resources at the same time, one of the major challenges is how we make sustainable development a ،،real,, issue, not that academic concept. The aim of the study is a try to deliver international scales and to face present challenges by benefit from experience of other countries and review the conclusion according to local requirement to make this experience real.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_114492.html}, eprint = {https://jesaun.journals.ekb.eg/article_114492_415341923243538207adaec622605b21.pdf} }