Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420211201The Evaluation of Natural Ventilation inside Residential Building Spaces in New Assiut City-(at Under Heated Period) - Egypt.12613178710.21608/bfemu.2020.131787ENEzzat A.MorghanyDepartment of Architecture., Faculty of Engineering., Assiut University., Assiut., EgyptAbdel-Monteleb M.AlyDepartment of Science& Engineering., University of Science and Technology., Sana'a., YemenRiyad M.El ShemeiriDepartment of Architecture., Faculty of Engineering., Ebb university., Ebb., YemenJournal Article20051011<strong>The movement of air has a great effect on architectural formation whether on the building level in terms of the shape of voids and the ventilating elements or on the level of the general planning of the whole area. controlling roads and passageways. directing housing units, and proper distribution of buildings becomes an essential factor lo provide the required natural ventilation for all buildings, Because of the absence of adequate field studies of housing gatherings in desert arias, in the Under Heated Period, the present research focuses on studying natural ventilation of Housing units in the Under Healed Period through field measurements in New Assiut City as a practical example of the desert area in order to ensure that they are climatically appropriate in the Under Heated Period. To achieve the objective of the study, the researcher draws upon the analytical method and field measurements. Through the climatic analysis of New Assiut City, the study of the factors influencing the air movement inside the spaces of housing buildings, the detailed study of the selected housing buildings, and the analysis of the field measurements of internal and external temperatures of these buildings and the yards, streets and green areas surrounding then, the present research comes up with some results and recommendations that can be implemented in hot desert areas in the Under Heated Period. </strong>https://bfemu.journals.ekb.eg/article_131787_d8d0139b67fa6108e2c94ec00b2dfcfa.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Effect of Aggregates on Early Age Flexural Strength and Maturity Predictions.11313179410.21608/bfemu.2020.131794ENA. M.HeniegalCivil and arch. Construction dept., faculty of industrial education, Suez canal univ, Suez, EgyptJournal Article20051211<strong>This article discusses early age flexural strength development in concrete, specifically investigating the role of aggregates and their impact in maturity predictions. The maturity method is becoming more widely used by the construction industry to signal when certain construction operations (e.g., opening to traffic or removing formwork) can be performed. In addition, the maturity method is used in various computer programs to simulate how physical properties develop during hydration. The maturity method is based on the concept that strength (or mechanical property development is proportional to the extent of chemical reaction (i.e., hydration) that has taken place. It is commonly assumed that the extent of chemical reaction (i.e., the degree of hydration) is a unique function of the product of lime and temperature. It is the hypothesis of this work that aggregates can alter this relationship specifically influencing the early age relationship between maturity and flexural (or tensile) strength. To verify this hypothesis the nonevaporable water (i.e., the d<span style="text-decoration: underline;">e</span>gree of hydration) was related to the flexural strength development in paste, mortar, and concrete specimens. A linear relationship was observed between the flexural strength and the nonevaporable water for paste specimens, while a bilinear response was observed for both mortar and concrete. The knee point of this bilinear behavior corresponds to the time at which the majority of the aggregates begin to fracture. At very early ages (i.e., less than 2.5 days in this study) the flexural failure behavior is dominated by the paste or bond failure, while at later ages flexural failure is dominated by a<span style="text-decoration: underline;">g</span>gregate failure. </strong>https://bfemu.journals.ekb.eg/article_131794_461e04a11b9808384eca24062b647682.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Behaviour of Rubberized Plain and Reinforced Concrete under Impact.142413180010.21608/bfemu.2020.131800ENWalidSafwatCivil structures Department., Faculty of industrial education, Suez canal univ, Suez, EgyptAshrafHeniegalCivil structures Department., Faculty of industrial education, Suez canal univ, Suez, EgyptJournal Article20050811<strong>Utilization of rubber tire waste products in concrete has attracted attention because of energy crisis and the environmental problems. The concrete are postulated to be a potential material especially for construction applications, which are subjected to impact effects such as crash barriers, bridges and roads. In this study, an analysis of rubberized concrete was done by using various proportions of crumb rubber as a replacement of sand by volume [0 %, 15%, 30%, 50% and 100%). The slump for five different mixes was measured. On the other hand twenty plain and reinforced concrete beams with dimensions (10 x 10 x 70 cm) were prepared for impact resistance lest. The impact resistance was measured as a kinetic ene<span style="text-decoration: underline;">rg</span>y, which generated by falling of a load (15 kg.) from variable distances until the failure occurs. Cubes, cylinders and beams were prepared to study the compressive strength, toughness and impact for rubberized concrete. The concrete mixtures exhibited lower compressive strength than normal concrete, however the samples did not has a brittle failure but it has a ductile failure, and has the ability to absorb large amount of plastic ene<span style="text-decoration: underline;">rg</span>y under impact strength. On the other hand the results showed that the impact resistance of rubberized concrete was h<span style="text-decoration: underline;">i</span>gher. </strong>https://bfemu.journals.ekb.eg/article_131800_fc8c30cee6e39d89c1f078cf760333be.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Response of FRP Jacket under Sustained Load and Low Temperature.253613182110.21608/bfemu.2020.131821ENW.FahmyCivil structures., Faculty of Industrial Education, Suez Canal University., Suez, Egypt.A. M.HeniegalCivil structures, Faculty of Industrial Education, Suez Canal University., Suez, Egypt.Journal Article20051011<strong>FRP materials are now increasingly being used in the construction industry. Confinement of circular concrete members using FRP is a popular application. As such, studying the performance of concrete members confined by FRP jackets, under severe weather conditions is quite important for both rehabilitated and new structures in cold climatic conditions. However, no sufficient data on FRP wrapped cylinders subjected to the two conditions combined, as in actual structures, which may have a synergetic effect. Stress level and temperature are two factors that influence creep-strain in composites. Orientation of the fibres is another factor that needs to be considered when analyzing creep in FRPs. </strong><br /> <strong>This research is intended to examine the combined effects of freeze-thaw cycles and sustained loads, simultaneously applied on FRP-confined concrete cylinders, including cylinders with GFRP wraps and CFRP wraps. Test results of specimens subjected to the combined effects have been compared to those of other specimens subjected to sustained loading only at room temperature and to those of specimens subjected to freeze-thaw only without sustained loading. It should be noted that columns in actual structure are not free to expand axially as they are restrained by the floors above or below. As such, it is believed that the sustained loading setup used in this study has represented the end constraints and has provided boundary conditions similar to actual conditions. In general, the study showed that freeze-thaw cycling had minimal effect on FRP-wrapped concrete cylinders without sustained loads, and almost no effect on FRP-wrapped concrete cylinders with sustained loads. On the other hand, plain concrete cylinders under the same freeze-thaw conditions were completely disintegrated after only 100 cycles. It was also noticed that the sustained loading changes the stress-strain curve of FRP-confined concrete, where the transition in the bi-linear curve occurs at higher load.</strong>https://bfemu.journals.ekb.eg/article_131821_87a25b9ec16e79883e8edd651abeb0b3.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Effect of Initial Sag and Tension in Cables on Outcome Responses in Cable Structures.375613182510.21608/bfemu.2020.131825ENMohamed NaguibAbou El-SaadStructural Engineering, Department
Faculty of Engineering,El- Mansoura University., Mansoura., EgyptJournal Article20051011<strong>The main object of this research is concerned about the effect of both initial sag and initial tension in inclined cables on the outcome responses of sonic cable structures , such as cable stayed bridges and guyed towers. A new technique for the choice of the best initial tension in cables depending on an iterative scheme to give the minimum static responses. This technique is termed " optimum outcome response shape'. The static analysis of cable stayed bridges having three spans with single cables in harp, radiating and fan shapes, which represent the most common bridges, and guyed towers, is carried out. Two cases of loading which include the most dominant symmetric and asymmetric traffic loads with four cases of connections types between pylons and floor beams are considered in the analysis of the bridges. Also, the case of wind load with mean wind speed of 150 km/hour at 10 m, above the ground is considered for guyed towers . Both static and dynamic analyses are carried out taking into consideration geometric and material nonlinearities. In both static and dynamic analyses, the energy method, based on the minimization of the total potential energy of structural elements, via conjugate gradient technique is used. The procedure is carried out using iterative steps to acquire the final configurations. All prepared computer programs in FORTRAN language for this work are written by the author which programs have a high reliability when compared with other prepared programs in this field. The major conclusions which give a significant reduction in the outcome responses, have been drawn .. </strong>https://bfemu.journals.ekb.eg/article_131825_99d2221c1de7191572de1707f41fd154.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Two Spans Cable Stayed Bridges.578013183210.21608/bfemu.2020.131832ENMohamed NaguibAbou El-SaadStructural Engineering Department., Faculty of Engineering El-Mansoura University, El-Mansoura, EgyptJournal Article20051011<strong>This paper is concerned about the study of two spans cable stayed bridges. Three common types of these bridges as harp, radiating and fan shapes arc considered. The static analysis considering single plane and double planes of cables as the mathematical models is carried out. The variations of pylon height to span of the bridge in all cases, the influence of connections between pylons and deck floor and the arrangements of cables are the major factors of this work. The effect of symmetrical and asymmetrical loads such as, the own weight of all structural elements, traffic load including impact, and wind loads in longitudinal and transverse directions of the bridges are taken into account. The study of fundamental natural frequencies is investigated. Finally, the dynamic analysis in time domain for some special cases is presented. In both static and dynamic analysis, the energy method, based on the minimization of the total potential energy of structural elements, via conjugate gradient technique is used. The procedure is carried out using the iterative steps to acquire the final configurations. The author constructed all computer programs used in the analysis. The major conclusions, which have been drawn from the present work, are outlined. </strong>https://bfemu.journals.ekb.eg/article_131832_56bb56ba341f9081e1c2a3f867a07d81.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Design of Circularly Symmetric 2-D FIR Filters Using a Novel Technique in Calculating the Coefficients of McClellan Transformation.11513184610.21608/bfemu.2020.131846ENOmar A.AlHeyasatComputer Engineering Department, Mu'tah University, JordanSaod A.AlseyabComputer Engineering Department, Mu'tah University, Jordan.Journal Article20050711<strong>In this paper, a novel analytic technique for the design of 2-D zero phase FIR circularly-symmetric filters is presented using the McClellan transformation. By this technique, a direct computation of the coefficients of McClellan transformation is derived by mapping the 2-D circular cutoff contour onto the /-D passband cut off and defining some deviation function, which is then freed to be zero for that contour. Then by comparing all the parameters in the resulting deviation function, one can easily determine the coefficients of McClellan transformation. This technique is formulated to assure that no scaling is needed. The McClellan coefficients in the presented technique may be simplified while a good approximation of the circular contour is maintained. The approximated version of the coefficients formulas appears to be the best to solve the problem of both accuracy and hardware implementation complexity. Using this approximation, one can get coefficients formulas which are suitable for real-time applications and can be easily implemented on a general-purpose signal processor.The design procedure is verified by several design examples and by comparison with previously published results.</strong>https://bfemu.journals.ekb.eg/article_131846_64a00679104295587c6cfab501853610.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223On-line Fault Detection of Transmission Line Using Artificial Neural Network.162113185310.21608/bfemu.2020.131853ENSamah M.El SaftyFaculty of Engineering, Arab Academy for Science and Technology, Alexandria, EgyptHamdy A.AshourFaculty of Engineering, Arab Academy for Science and Technology, Alexandria, EgyptHesienEl DessoukiFaculty of Engineering, Arab Academy for Science and Technology, Alexandria, EgyptMohamedEl SawafFaculty of Engineering, Arab Academy for Science and Technology, Alexandria, EgyptJournal Article20051011<strong><em> </em>As the voltage and current waveforms arc deformed due to transient during faults, their patient changes according to the type of fault. The Artificial Neural Network (ANN) c2 then be used for fault detection due to its distinguished behavior in pattern recognition. In order to minimize the structure and timing of the ANN, preprocessing of the voltage and current waveforms was done, The data delivered from a simulated power system using PSCAD (EMTP with cad system) was used for training and testing the ANN. An experimental setup, consists of a 3 phase power supply module and transmission line module, is utilized. A set of signal conditioning circuits is designed and implemented in order to transfer data to a PC which is used as an on-line relay for fault detection. This is done via a data acquisition card (CIO DAS1602<em>/12</em>). The Matlab program captures and processes real data for training the ANN. <em>A</em>pplying different types of saults for testing the system, right tripping action was taken and the type of fault was correctly identified. The suggested artificial neural network algorithm has been found simple and effective hence could be implemented in practical application.</strong>https://bfemu.journals.ekb.eg/article_131853_08ebe842d3218bde58af3473ed40c5a0.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Experimental Based Method for Sizing Photovoltaic Power System Suitable for Cooling Greenhouses.223013186610.21608/bfemu.2020.131866ENSaad Saad El-SayedEskanderElectrical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., EgyptH. M.NoorResearcher Agricultural Engineering Research Institute,
(AENRI). ARC. Dokki, GizaJournal Article20051011<strong>This paper presents new method for designing photovoltaic power system (PVPS) suitable for cooling the greenhouses. The designed PVPS is installed at Serw station at cooling cucumber crop. The greenhouse, under test has the geometrical configuration of, 6m length, 4m width and 2m height. The indoor temperature of the greenhouse is 50oc before cooling. This level of temperature has a harmful effect upon the cucumber. Hence, the cooling system must be installed for increasing the mass production of the crop within the greenhouse. PVPS is designed to operate the cooling system contains one blower and a fan, they require electrical energy of 1.7KWhr. This paper illustrates new method for designing the PVPS. The proposed method is based upon the experimental behavior of one module of solar cells array and lead acid battery. The method strategy depends upon the energy balance principle. An algorithm and flow chart illustrate the design steps are built up. Graphical charts and mathematical model are obtained to determine the array and battery size required for supplying the previous load (1.7 kWhr). Consequently, the charts obtained can be used for designing any small PVPS system provides desired load. The results obtained by the proposed method are compared with that obtained by the famous method (NASA method). The paper presents that the two methods are approximately identical. The tested greenhouse requires PV<em>P</em>S of 2 modules <em>7</em>5 W peak each and two batteries of 80 Ahr lead acid battery. </strong>https://bfemu.journals.ekb.eg/article_131866_a609fb322fd642763624bd936663f8f9.pdfMansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092330420201223Laminar Free Convection from an Elliptic Tube Placed in a Microplar Fluid with Vertical Plate as a Special Case.11413187110.21608/bfemu.2020.131871ENF. M.MahfouzMechanical Power Department, Faculty of Engineering,
Menoufia University, Shebin El-kom,
EgyptJournal Article20050911<strong> In this paper laminar free convection heat transfer from a horizontal isothermal elliptic tube placed in a micropolar fluid with its major axis vertical is investigated. The governing equations basd on the conservation of mass, linear momentum, angular momentum and energey are numerically solved using the Fourier Spectral method. The main controlling parameters, beside the material parameters of the micropolar fluid, are the Rayle<span style="text-decoration: underline;">i</span>gh number, the Prandil number and the elliptic section axis ratio The micropolar fluid parameters are the vortex Viscosity, micro-inertia density and Spin gradient viscosity The results, which were obtained for a range of these parameters, were carried Out. at two axis ratios of 0.5 and 0.025. The axis ratio of 0.025 approximates the geometry of the special case of vertical flat plate. The results for vertical plate placed in Newtonian fluid arc compared with the relevant results in the literature and very good agreement was obtained. The study has shown that the vortex viscosity is the frost influencing material parameter on heat transfer rate. </strong><br /> <strong>The study showed that as the vortex viscosity increases the heat transfer rate decreases. </strong>https://bfemu.journals.ekb.eg/article_131871_e2a582c72c560a30dd55f0f78d627dd2.pdf