@article { author = {Abdo, Mohamed Abdel-Basset}, title = {ANALYSIS OF STEEL BRIDGES WITH RECTANGULAR WEB OPENINGS: FINITE ELEMENT INVESTIGATION}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {1-17}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123766}, abstract = {This study is concerned with parametric study of the effect of rectangular web openings on the response of steel bridges with cross frames and bottom lateral bracings. The study includes studying the deflections of steel bridges as an important factor of static response and the frequencies of steel bridges as an important factor of dynamic response. The influence of rectangular web openings of various sizes and numbers on the response of steel bridges is investigated with and without horizontal stiffeners (reinforcements). Buckling and instability failures of the steel beams are not considered in the present analysis. Based on the analysis results of steel bridges with cross frames and bottom lateral bracings, it is shown that existence of only one rectangular (square) web opening at mid span has almost negligible effect on the maximum deflections at mid span and small effect on the frequencies of bridge models. However, existence of more than one square or rectangular web opening leads to great increase in the deflection at mid span and considerable decrease in frequencies. Also, an increase in the ratio of web opening height to web height leads to great increase in the maximum deflection of bridge model. On the other hand, horizontal stiffeners (reinforcements) above and below web openings improves both static and dynamic response of steel bridge models especially, for multiple web openings. However, the effect of reinforcement stiffness is more pronounced for static response.}, keywords = {analysis,steel bridges,rectangular web openings,Finite Element,investigation}, url = {https://jesaun.journals.ekb.eg/article_123766.html}, eprint = {https://jesaun.journals.ekb.eg/article_123766_6a91c692d808b9963e7d2120275ae002.pdf} } @article { author = {Abozeid, Gamal and Ibrahim, Hassan and Shehata, Salah M.}, title = {HYDRAULICS OF CLEAR OVERFALL WEIRS WITH BOTTOM-OPENINGS}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {19-28}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123769}, abstract = {Many Fayoum Standard Weirs have been perforated by one, two or three pipes, to convey much water in downstream direction. Measurements of discharge with these structures are complicated due existence of the opening. In this research, an experimental study was carried out to investigate the flow over clear over fall weir with bottom opening. Nine weir models with different heights were tested in horizontal laboratory flume of 17 m length, 0.3 m width, and 0.5 m depth. Weir height is changed three times. For each one, the diameter of opening is changed three times. The downstream depth was changed to cover all the expected flow regimes of the pipe and the weir. These flow regimes are; free pipe-free weir, submerged pipe-free weir and submerged pipe-submerged weir. The results of flow over weir with opening were compared with those of weir without opening having the same dimensions. It was found that there is a large deviation between them. Multiple regression equations based on energy principal and dimensional analysis theory were developed for computing discharge over clear over fall weir with bottom opening. Also, values of discharge coefficients were estimated for combined flow over the weir and through the pipe. Then the total discharge can be computed by multiplying the discharge coefficient by the summation of theoretical weir discharge plus theoretical orifice discharge. Equations for computing the discharge of combination are awarded.}, keywords = {Fayoumi weir,bottom opening,Discharge Coefficient}, url = {https://jesaun.journals.ekb.eg/article_123769.html}, eprint = {https://jesaun.journals.ekb.eg/article_123769_c9aa20e94b96df7179ab4d9ab80c79f4.pdf} } @article { author = {Ahmed, Eman Maher and Ali, N.A. and Ali, A.A. and Dardir, M.S.}, title = {PURIFICATION OF AERATED GROUND-WATER USING RAPID SAND FILTERS}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {29-43}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123773}, abstract = {Most of arid and rural areas in Egypt depend on groundwater as a main source of drinking water. The main problem in this source of water is the appearance of iron salts which affects the water potability. Several studies had been applied to solve the iron problem in water. Aeration is considered the best and cheapest way to remove iron salts from groundwater. Aeration depends on oxidation of soluble iron (II) to the insoluble iron (III) form which it can be removed by using filtration following sedimentation or filtration only depending on iron concentration on the raw water. This study is conducted to investigate the success of a proposed technique using aeration followed by filtration without chemical additions for iron removal. The effect of different filtration of sand depths, filtration rates and raw iron concentrations on the efficiency of removal of iron and turbidity are considered. The research is applied on tap water with different values of iron concentrations. The predetermined values of iron concentrations were 1.5, 2, and 3.33 mg/l which chosen to give different values of turbidity after aeration (13, 20, and 30 NTU respectively) and to cover the range of the average values (about 1 to 5 mg/l) which appear in the most of water wells in Upper Egypt. Results indicated that, for all values of iron concentrations and effluent turbidity less than 1 NTU, the economical sand depth is 40 cm when the influent turbidity 70 cm when the influent turbidity < 30 NTU and filtration rate in the rang from 80 to 200 m3 /m2 / day.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123773.html}, eprint = {https://jesaun.journals.ekb.eg/article_123773_7bf28a97221ca2b73570c5737778e8a9.pdf} } @article { author = {Ahmed, Ahmed K.A. and Mohamed, Ahmed A. and Gad, Ali A.M. and El- dardeer, Mohamed E.}, title = {DRINKING WATER QUALITY SIMULATION IN ALMONSHA DISTRIBUTION NETWORK}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {45-70}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123776}, abstract = {Water quality in distribution systems has become a prominent issue in the study of water networks. This study concentrates on chlorine disinfection as an indicator of water quality. The model discussed in this work is based on laboratory and field collected data. The model is applied on a real network which exists in Almonsha city in Upper Egypt. The experimental set-up and procedure of measuring bulk (Kb) and wall (Kw) chlorine decay coefficients are described. The collected field data together with experimental results are used for calibrating the model using extended period simulation. The aim of this study is to find a solution for the absent of the free residual chlorine in several sections of Almonsha water distribution network. The diurnal variations of domestic water consumption are taken into consideration. Also, different values have been assigned for the daily water consumption for both rural and urban zones of the network. Different water resources (surface and underground water) have been involved in the model. Underground water reservoirs and high elevated tanks are included in the simulation. The water level in the high elevated tanks and water table in the feeding wells are studied. The free residual chlorine concentrations (FRCCs) were measured at different sections of the network and used for the model calibration. FRCCs have been simulated in different locations of the network at several times using extended period simulation. The results of the field and experimental works have shown that, the initial chlorine concentration (C0) has an effect on Kb, an equation is derived to express the relation between them. Also, another equation is derived for the relation between C0 and Kw. The simulation process was extended for several months to dispose the effect of the initial conditions. It is found that, with the existing system of chlorine injection, some parts of the network keep nil values of FRCC even with an injected free residual chlorine dose reaching to 5 mg/L at the feeding point. A new technique is proposed. This technique is based on superposition method for chlorine disinfection. Finally, with the superposition method, it is found that, the minimum injected chlorine dose which should be injected at the feeding points ranges between 0.83 mg/L to 2 mg/L. This dose is found to be sufficient to keep the minimum FRCC with values not less than 0.3 mg/L for the whole parts of the concerned network at all day hours}, keywords = {water quality,Disinfection,residual chlorine,Distribution networks,Extended period simulation}, url = {https://jesaun.journals.ekb.eg/article_123776.html}, eprint = {https://jesaun.journals.ekb.eg/article_123776_6a138415b95289fc7aabe47af0395ea4.pdf} } @article { author = {Ali, Nashat A. and Abozeid, Gamal and Mohamed, Ali A. and Darweesh, Moustafa S.}, title = {HYDRAULICS OF SURFACE POLLUTED WATER - JET IN OPEN CHANNEL FLOW}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {71-84}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123780}, abstract = {Presented in this paper are the results of an intensive experimental program for studying the influence of jet inclination, velocity ratio, pollutant type and initial concentration on hydraulic characteristics of polluted surface water jet in open channel flow. Polluted jet is injected from a sided polluted source with different angles of inclination to mainstream direction. The polluted water is prepared by adding two types of chemicals (sodium chloride and pfennig) with different concentrations to fresh water. The initial jet velocity is varied to cover a range of velocity ratio R from 2.73 to 10.0. For each velocity ratio, the solute concentration is changed to take 800, 1050, 1382.23, 1440, 1780 and 2320 p.p.m .The centerline jet trajectory, velocity decay, pollutant dilution and the width of polluted area are measured. The velocity is measured by a calibrated current meter while the jet coordinates and water depths are measured using point gages. Samples are taken from jet centerline to measure the jet concentration. The concentrations are measured using Conductance /Total Dissolved Solids Model 76. The factors influencing the problem are normalized with the help of dimensional analysis theory. The analysis of the results revealed that the characteristics of a polluted water jet in cross-flow depend mainly on jet to main stream velocity ratio and jet inclination to the main stream. Also, the decay of the velocity and dilution of pollution concentration are mainly depending on the studied parameters. The type of pollution does not affect these characteristics. Equations have been developed for the correlation of the experimental results. A comparison between the results of present study and those from previous studies are carried out. These comparisons give a reasonable agreement.}, keywords = {Open channels,Surface discharging jets,Pollutant concentration and type}, url = {https://jesaun.journals.ekb.eg/article_123780.html}, eprint = {https://jesaun.journals.ekb.eg/article_123780_28f133d97d3db8914c951ba41fac3a0c.pdf} } @article { author = {ELsayed, Aly Abdel-Zaher and Soghair, Hosny M . and Rashwan, Mohamed M. and Abou-Zied, Ali Mohamed Abdallah}, title = {BEHAVIOUR OF HIGH-PERFORMANCE CONCRETE BEAMS AS AFFECTED BY BONDED PART AND RIB GEOMETRY OF MAIN STEEL REINFORCEMENT}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {85-103}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123782}, abstract = {The need of high-performance concrete is increased in the recent years. Also using steel of high grade and maximize the benefit of using these material become necessary .So, different ribs are used for enhancing the bond strength between steel reinforcement and high-performance concrete . There is little information in the available literature about the bond characteristics for the different forms of rib geometry of the deformed bars and its effect on behavior of high-performance concrete beams for different relative rib area( αsb ) and development length. The main objective of this research is to study the effect of bonded part and rib geometry of main steel bars on behavior of high-performance concrete beams, also Pattern of cracks, final mode of failure and deformation characteristics (deflection, slip, concrete strain and slope for beams) were investigated.}, keywords = {Bond,High performance concrete,Beams,Behavior,Rib geometry,steel}, url = {https://jesaun.journals.ekb.eg/article_123782.html}, eprint = {https://jesaun.journals.ekb.eg/article_123782_4774fd22e61d375b50aea82d5ea2bfb1.pdf} } @article { author = {Khalil, Alsaied}, title = {AN EXPERIMENTAL STUDY ON MULTI-PURPOSE DESICCANT INTEGRATED VAPOR-COMPRESSION AIR-CONDITIONING SYSTEM}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {105-118}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123785}, abstract = {In this paper, a multi-purpose hybrid desiccant integrated vapor compression air conditioning system of a small capacity is experimentally investigated. The system, referred as HDAC, is designed to meet the cooling load of spaces having large latent heat portions and at the same time to extract water from atmospheric air. The system is mainly consisted of a liquid desiccant dehumidification unit integrated with a vapor compression system (VCS). The dehumidification unit uses lithium chloride (LiCl) solution as the working material. The effect of different parameters such as, desiccant solution flow rate, process air flow rate, evaporator and condenser temperatures, strong solution concentration and regeneration temperature on the performance of the system is studied. This system has a water recovery rate of 6.7 l/h.TR of pure water at typical north Egyptian climate. The HDAC system has a COP as high as 3.8 (an improvement of about 68% over the conventional VCS. The system offers a total cooling capacity of about 1.75 TR using a 0.75 TR VCS unit. Finally, the proposed system is found to have a payback time of about 10 months without any considerable extra capital cost compared to the known split air conditioning system. The results emphasize the potential benefits of the HDAC system.}, keywords = {Hybrid System,Dehumidification,water recovery,vapor compression system,Liquid desiccant,life cycle analysis}, url = {https://jesaun.journals.ekb.eg/article_123785.html}, eprint = {https://jesaun.journals.ekb.eg/article_123785_751118d911d3c3a456f9ff1294b1bfe9.pdf} } @article { author = {A., Hassan M. and A., Abouel-Kasem and El-Sharief, Mahmoud A.}, title = {EVALUATION OF THE MATERIAL CONSTANTS OF NITRILE BUTADEINE RUBBERS (NBR) WITH DIFFERENT CARBON BLACK (CB): FE-SIMULATION AND EXPERIMENTAL}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {119-134}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123790}, abstract = {Carbon black (CB) is used to enhance the mechanical properties of nitrile butadiene rubber (NBR) compounds compared with unfilled compounds. Rubber component design has remained a tedious work because of poor material models inadequately representing hyperelastic and viscohyperelastic behaviour. However, an appropriate choice of material constants can enable predicting elastomeric deformation sensibly and thus make well designed rubber products economically. In this paper, the experimental mechanical properties of NBR with different carbon black loading, CB, have been determined through, tension, compression and relaxation tests. Nonlinear mechanical behaviors of rubbers are described by strain energy functions in order to guarantee that the rigid body motions play no role in the constitutive law. The mathematical material models are based on the existence of strain energy density functions, W, to be scalar potential that depend on the component of the right Cauchy-Green deformation tensor or Green’s strain tensor. The experimental data are fitted to these models in order to find the rubber material constants. Viscohyperelasticity behavior is generated by fitting the experimental data provided by the standard quasi-static tests (tensile, compression) to determine the material constants, while the standard relaxation tests are used to obtain the scalar multipliers and relaxation time constants. Study of the material constants based on different strain energy density functions is carried out. A comparison between experimental load/displacement response and FE-analysis of uniaxial compression test at different CB loading is presented.}, keywords = {Rubbers,carbon black,Material properties,material models,hyperelastic and viscohyperelastic behavior,FES}, url = {https://jesaun.journals.ekb.eg/article_123790.html}, eprint = {https://jesaun.journals.ekb.eg/article_123790_cc452e218442b41e3269cf127bdfb73c.pdf} } @article { author = {Othman, Mahmoud M. and Sharkawy, Abdel Badie and Khalil, Abouel Makarem A.}, title = {FUZZY TRACKING CONTROL OF TWO DEGREES OF FREEDOM ROBOTIC ARM}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {135-156}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123792}, abstract = {In this paper, we derive a fuzzy logic controller (FLC) for robotic systems. The approach implements fuzzy partition to the state variables based on Lyapunov synthesis. The resulting control law is stable and able to exploit the dynamic variables of the system in a linguistic manner. The presented methodology enables the designer to systematically derive the rule base of the control. We further simplify the procedure leading to a computationally efficient FLC. The methodology is model free approach and does not require any information about the system nonlinearities, uncertainties, time varying parameters, etc. Here, we present experimental results of the following controllers: the conventional PD controller and the proposed FLC. The two controllers are tested and compared with respect to ease of design, implementation, and performance of the closed loop system.}, keywords = {trajectory tracking,Fuzzy logic controller (FLC),PD Control,Two-link robot}, url = {https://jesaun.journals.ekb.eg/article_123792.html}, eprint = {https://jesaun.journals.ekb.eg/article_123792_7de9756e02e666676980a95fdbf0f0e7.pdf} } @article { author = {Abdel-Rahman, Ali K. and Abbara, Abdel-Aziz A. and Bayoumi, Mohamed R.}, title = {MODELING OF THE PERMEATE FLUX DECLINE DURING MF AND UF CROSSFLOW FILTRATION OF SUGARCANE JUICE}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {157-176}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123795}, abstract = {Experimental results on permeate flux decline with time obtained from crossflow microfiltration (MF) and ultrafiltration (UF) tests were compared with those predicted numerically using the two-dimensional convective-diffusion equation. Numerical simulations of the flow and heat transfer were made using the two-dimensional momentum and energy equations. Feed solution consisted of sugarcane clear juice and limed mixed juice to pH of 7.5. Experimental tests were performed in plate and frame module employing three different MF and UF polysulphone membranes (i.e. 1 μm pore size, 25 and 100 kD molecular weight cut-off, MWCO). Influence of process variables viz. transmembrane pressure (TMP) (i.e. 1.0, 1.5 and 2.0 bar) and feed temperature (i.e. 50, 60 and 70 oC) on the flux of permeate were studied. The present study shows that the permeate flux obtained both experimentally and numerically is increased as the transmembrane pressure is increased for all the membranes considered in this study. Moreover, permeate flux has been increased as the feed temperature is increased and decreased with time. Numerical predictions of permeate flux show a reasonable agreement with experimental counterparts.}, keywords = {Flux decline,Numerical Modeling,microfiltration,Ultrafiltration,Transmembrane pressure}, url = {https://jesaun.journals.ekb.eg/article_123795.html}, eprint = {https://jesaun.journals.ekb.eg/article_123795_4d9410b2f8d3777dc1b4c394cc546e04.pdf} } @article { author = {Al-Nehari, Hamoud A. and Abdel-Rahman, Ali K. and Nassib, Abd El-Moneim and Shafey, Hamdy M.}, title = {DESIGN AND CONSTRUCTION OF A WIND TUNNEL FOR ENVIRONMENTAL FLOW STUDIES}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {177-193}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123800}, abstract = {This paper presents the design, construction, and preliminary characterization of the atmospheric boundary layer wind tunnel facility for environmental flow studies at Assiut University. The wind tunnel is a low speed-open loop and driven by a 2 kW, 4 m3/s, axial flow fan. The main core of the designed wind tunnel is the long section (3.5 m length) devoted to produce and simulate the atmospheric boundary layer (ABL) for various environmental flow studies. The simulation of the ABL can be achieved for different earth surface conditions by inserting of well designed spires arrangement and arrays of roughness elements. The design procedure and the construction steps for the main components of the wind tunnel are summarized. The experimental results of the mean axial velocity profiles for different fan speeds are presented and discussed for the preliminary characterization of the wind tunnel. The results show that the present wind tunnel is capable to maintain long run steady flow characteristics and reproducible flow patterns. The use of designed triangular spires and cube roughness elements is successful in simulating real ABL of thickness up to 600 m corresponding to urban area.}, keywords = {atmospheric boundary layer,Low speed-open loop wind tunnel,Wind tunnel characterization,Environmental Flow}, url = {https://jesaun.journals.ekb.eg/article_123800.html}, eprint = {https://jesaun.journals.ekb.eg/article_123800_34a3f3e0fce7ef6d68d04cfce5457dd6.pdf} } @article { author = {Saleh, Awad I. and Hasan, Mohamed M. M. and Darwish, Noha M. M.}, title = {THE MIKHAILOV STABILITY CRITERION REVISITED}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {195-207}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123808}, abstract = {It is shown that the principle of the argument is the basis for the Mikhailov’s stability criterion for linear continuous systems. Mikhailov’s criterion states that a real Hurwitz polynomial of degree n satisfies the monotonic phase increase, that is to say the argument of goes through n quadrants as w runs from zero to infinity. In this paper, the generalized Mikhailov criterion where a real polynomial of degree n with no restriction on the roots location is considered. A method based on the argument is used to determine the number of roots in each half of the s-plane as well as on the imaginary axis if any.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123808.html}, eprint = {https://jesaun.journals.ekb.eg/article_123808_3c386423e5aed90ac86601e7dea77267.pdf} } @article { author = {Saleh, Awad I. and Hasan, Mohamed M. M. and Darwish, Noha M. M.}, title = {DETERMINATION OF CONTROLLERS GAINS LIMIT USING THE MIKHAILOV STABILITY CRITERION}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {209-219}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123812}, abstract = {Mikhailov’s criterion states that a real Hurwitz polynomial of degree n satisfies the monotonic phase increase, that is to say the argument of goes through n quadrants as w runs from zero to infinity. In this paper, we utilize the generalized Mikhailov criterion presented in [1] to give a solution to the problem of finding the stabilizing feedback gains for a given linear-time invariant plant having a P controller, a PI controller and a PID controller.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123812.html}, eprint = {https://jesaun.journals.ekb.eg/article_123812_f4ff21e7a35ab76345a1f40cf09f6bf2.pdf} } @article { author = {Mohamed, Yehia S.}, title = {ROBUST SPEED AND PARAMETER ESTIMATION FOR HIGH PERFORMANCE FIELD-ORIENTED CONTROL OF INDUCTION MOTOR DRIVES}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {221-242}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123813}, abstract = {This paper presents linear estimation techniques used to identify the stator resistance, the stator leakage inductance (transient inductance), the stator self inductance and rotor time constant of an induction motor without measuring its speed. Such estimation is important to achieve high performance for sensorless field-oriented control of induction motor drives. The discrete-time parameter estimation models express the relationships of the dynamic machine model in terms of measurable stator voltages, currents and an estimated motor speed. These models are represented by linear regression equations from which machine parameter vectors can be obtained using a recursive least squares (RLS) estimation algorithm. Moreover, a robust speed estimator based on a model-reference adaptive system (MRAS) is proposed to use the estimated parameters for accurate estimation of motor speed. The estimated motor speed is used iteratively in the parameters linear estimation models and is fed back in a sensorless field-oriented control of motor drive. The accuracy of parameter estimation is good regardless of load conditions. Simulation results validate the proposed scheme with reasonable accuracy of the estimated parameters as well as excellent performance of the motor drive.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123813.html}, eprint = {https://jesaun.journals.ekb.eg/article_123813_465c78f54372a5718f26d389fb59ca41.pdf} } @article { author = {Al-Maghrabi, M. H. and Aboushook, M.I. and Fadol, Abbas and Abdelhaffez, Gamal}, title = {COMPARISON BETWEEN BOTTOM AND SIDE INJECTION OF BENTONITE SLURRY IN TREATMENT OF SAND DUNES}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {243-258}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123817}, abstract = {Movement of sand dunes in the Arabian Peninsula hinder land development, expansion of city limits, and cause hazard in paved roads across arid areas. Population growth and environmental construction have been harmed by these sand dune blunders. Sand dunes stabilization has been the concerns of many government agencies and academic institutions. Many researches have contributed various methods to counter the sand dunes movement. Some of these researches have used agriculture scheme to attain stabilization. Such project requires continuous supply of water and needs several years to realize its objective. Lack of careful monitoring or a shortage of water supply would rapidly degrade the stabilization process, and sand dunes eventually bounce back to uncontrolled movement and desertification. Other researchers opted for chemical and polymers components as stabilization agents. It stabilizes only the top surface of the sand dunes. A moderate air draft/ gust of air would erode the top cover and thus frees the underneath sand dunes to move unrestrained/ uncontrolled. Additionally, using chemical and polymers components are not environmentally advocated. This research is a first part of competent research program studying different methods of sand dunes treatment using bentonite ore which are: mixing& compaction with bentonite powder and slurry; surface and subsurface spraying of bentonite slurry; bottom and side injection of bentonite slurry. This study has used the non- active calcium bentonite ore coming from khulais region, Saudi Arabia. This deposit has a very big reserve near to the surface and it is not used as commercial product until now and it is a natural clay deposit and has an ability to bind the sand grains and to conserve water for very long time. The stabilization process by this proposed method is not only on the surface of sand dunes but also to some depths from surface. That is to provide a relative thick bed on the sand dune surface that has the ability to resist wind blew and erosion. In addition, it is able to conserve water for very long time. This paper deals with the comparison between bottom and side injection of bentonite slurry in sand treatment. The method which used bottom injection gives some improvement in engineering properties of sand dunes. Their values increased to (3.5-4.0) times the original values compared with only (1.0-1.50) times the original values in the case of using side injection. These values have been obtained after 30 days of the treatment and using only 1% of bentonite concentration compared with 5 years after traditional treatments.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123817.html}, eprint = {https://jesaun.journals.ekb.eg/article_123817_329f74b0deaccd3105914de1125d545d.pdf} } @article { author = {Boghdady, Gamal Y.}, title = {MECHANICAL AND GEOLOGICAL INFLUENCES ON DRILLING LIMESTONE ROCK AT LOW ROTARY SPEED}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {259-270}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123818}, abstract = {The drillability of a rock mass is determined by various geological and mechanical parameters. In this study some major correlations between specific geological factors and drilling rate are shown. Drilling rate is dependent on a lot of geological parameters which include jointing of rock mass, orientation of schistosity (rock anisotropy), degree of interlocking of microstructures, porosity and quality cementation in clastic rock, degree of hydrothermal decomposition and weathering of a rock mass. Three types of limestone rocks were drilled by diamond core bit using a fixed laboratory-diamond drilling machine at 400 rotational speed, and over a range of weights on bit (WOB) 15,30,45,…….,150 kg. Operating parameters of the drill bit such as WOB, rate of penetration (ROP), torque and drilling specific energy (SE) were continuously monitored during the drilling trials. The effects of these parameters on the performance of the bit were examined. Relationships between WOB and both ROP, torque and SE were also described and the relationship between ROP and SE, was also given. Simple graphs are presented which can be used to predict diamond-drilling performance easy and fast.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123818.html}, eprint = {https://jesaun.journals.ekb.eg/article_123818_5a3326ac82a0407b736886f51bd6c9e8.pdf} } @article { author = {Abanomy, Waleed Mohamed}, title = {THE EFFECT OF FLOOR FINISHING MATERIALS ON SURROUNDED ENVIRONMENT IN HOT ARID REGIONS WITH REFERENCE TO "AL - NAHDA ROAD PARK, RIYADH, SAUDI ARABIA''}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {271-284}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123821}, abstract = {This research evaluates the influence of finishing materials on surrounded air temperature and relative humidity (RH). The main aim of this research is to demonstrate design strategies and recommendations in order to improve the thermal performance of open spaces in hot arid regions in general and in Riyadh city in particular. Field experiments and observation were conducted in Al - Nahda Road Park, Riyadh, Saudi Arabia. Readings of air temperature and RH were taken over different type of finishing materials (shaded and exposed to the solar radiation) to assess the influences of the materials and shading devices on the surrounded environment in each selected location inside the Park. Results analysis shows that shaded grass has significant effect on the surrounded air temperature reduction. The results also, emphasize that concrete and asphalt as finishing materials should be avoided in sitting and/or pedestrian areas. The results also demonstrate the importance of isolating open spaces from heat sources such as traffic vehicles.}, keywords = {Finishing and floor Materials,Environmental Design,Public Parks,Hot Arid Regions}, url = {https://jesaun.journals.ekb.eg/article_123821.html}, eprint = {https://jesaun.journals.ekb.eg/article_123821_03f0803f3e7b619675c12c1a69bcb177.pdf} } @article { author = {Dahlan, Ammar S. and Mohamed, Ahmed Helal}, title = {URBAN LEGISLATION AND ITS IMPACT ON AN ENVIRONMENT OF CONTEMPORARY ARCHITECTURE IN SAUDI ARABIA - STUDY OF BUILDING REGULATIONS IN THE CITY OF JEDDAH AS AN EXAMPLE-}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {285-304}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123824}, abstract = {This research aims to study the legislation Urban, And its impacts on the environment architecture Saudi Arabia, And specifically on the apartment building, Through extrapolation of architectural reality in the city in Saudi Arabia , And identify you have this legislation to create architecture that has achieved the status of sustainability needs and requirements of society or not The research methodology adopted to achieve the above objectives, to formulate a number of main themes identified for this research and that can be studied through achieving the objectives of previous research, these themes are: 1- The first axis: A view of urban legislation regarding the direction and organization of work of construction, which include consideration of the requirements of building Assembly, and then study the shortcomings in the legislation. 2- The second axis: study reflection shortcomings in the legislation on the environment of urban contemporary architecture in Saudi Arabia. 3- The third axis: the extrapolation of fact, the architect of legislation reflected the urban contemporary architecture, a case study city of Jeddah as an example.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123824.html}, eprint = {https://jesaun.journals.ekb.eg/article_123824_17d376ea13a91f041ccdf8ee5fd77e58.pdf} } @article { author = {Salah, Khaled and Mohamed, Abed_Elmontelb and Yaseein, Aber}, title = {CHARACTERISTICS OF THE HEALTHY HOUSE AND THEIR INTERRELATIONSHIPS}, journal = {JES. Journal of Engineering Sciences}, volume = {38}, number = {No 1}, pages = {305-322}, year = {2010}, publisher = {Assiut University, Faculty of Engineering}, issn = {1687-0530}, eissn = {2356-8550}, doi = {10.21608/jesaun.2010.123828}, abstract = {A human health is one of the most important points of concern for States and governments in general. In addition to strategies for prevention of diseases, countries spend vast sums to maintain the health of their individuals. These strategies include the protection of the environments in which human practice different life activities. If the proportion of time spent within the house about 50% or more, it is normal to have a significant impact on the health of human body, consequently, the residential environment plays an important role in the achievement of health for their users. Researches and studies, including both architectural or health studies has varied in perceptions and visions of the healthy house, but these studies did not clearly specify the different characteristics of healthy house that must be taken into consideration during the architectural design process in order to produce houses where there are health conditions makes it a healthy house. So, the main aim of this paper is to induct and classify health characteristics that should be in a healthy house and analyzing its interrelationships. To achieve the main aim of the research, the study uses descriptive, analytical and deductive methodologies to conclude and classify characteristics of healthy houses. The research studies at first the different definitions and concepts of health and its relationship with house. The second part is studying the interrelationship between design considerations on one hand and health on the other hand. Then the paper studies the principles of healthy housing from different views to conclude a set of characteristics for healthy house. Finally, the paper presents the most important results of the study and discussion for the results. Then the paper presents some recommendations associated with the research results.}, keywords = {}, url = {https://jesaun.journals.ekb.eg/article_123828.html}, eprint = {https://jesaun.journals.ekb.eg/article_123828_77c002f16d17c71449fb44bb54633f9c.pdf} }