Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420200609An Approach towards Achieving Urban Resilience in Threatened Urban Communities.1119473110.21608/bfemu.2020.94731ENMarwa Elsayed AliElsayedDemonstrator - Nile Higher Institute of Engineering and Technology,Master student at Architecture Dept., Mansoura University, EgyptAsmaa Nasr El DinEl BadrawyDepartment of Architecture – faculty of Engineering – Mansoura UniversitySheriefShetaArchitecture Department, Faculty of Engineering, Mansoura University, Egypt0000-0001-9296-287XJournal Article20190903<strong>The ongoing events and risks surrounding cities, whether natural, such as earthquakes, floods or unnatural ones (poverty, unemployment and lack of resources, etc.) have led to the need to examine and resilience of cities to resist such pressures and risks. This research presents the theoretical study of urban resilience and its characteristics and the concept of the resilient city in addition to studying the framework of the city's resilience and its goals and indicators. An analytical study is also undertaken in form of a comparative analysis of three city examples that face similar risks to that of Egypt. Finally, a summary is to have a methodology that is formulated to solve the problems and ways of dealing with them, especially economic and social development (the socio- economic aspects of resilience) in an analytical framework. Through which recommendations are targeting the most important urban elements of the city's poor areas, which can be given to develop and advance them.</strong>Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420200712The Extent to which the Land-Use Scheme relates to the Urban Development Plan.122210243710.21608/bfemu.2020.102437ENRania Badawy ShokryAbdul RahmanLecturer of Urban Planning and Urban Design, Department of Architecture, High Institute of Engineering and Technology, New Cairo AcademyJournal Article20190718<strong>Sustainable development is one of the most important pillars for the development of urban communities, in order to achieve this development, and sustainable planning is an essential factor contributing to the development process. As it is noticed that the misuse of lands and the random spread of urban areas wastes the available areas and resources in cities. This randomness in land use is the result of a lack of organized and effective planning for urban areas to harmonize with the required plans and available capabilities.</strong>Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420191019Using Urban Carrying Capacity (UCC) as a Tool for Evaluating Infrastructure of New Egyptian Cities to Promote Sustainable Development. Case Study: 10th of Ramadan City.232911960310.21608/bfemu.2019.119603ENShaimaa Ahmed Omar El-DesoukyMansourTeaching Assistant, Dep. of Architectural Engineering, Mansoura Higher Institute of Engineering and TechnologyAhmed Eltantawy EL-TantawyEL-MaidawyLecturer of Architecture Department of Architecture -Faculty of Engineering - Mansoura UniversityIbrahim RizkHegazyAssociate Professor in Architecture- Dep., Faculty of Engineering, Mansoura UniversityJournal Article20190325<strong>Urban growth is steadily increasing in the developing world, as indicated by the United Nations World Population Report 2007. This expansion leads to the deterioration of the urban environment due to its powerlessness to accommodate population prerequisites. This weakening is increasingly obvious in the infrastructure elements, which need protection and good use to accommodate the necessities of the present and future. The concept of carrying capacity of the elements of the urban environment has the attention of many authorities worried about support urban sustainability globally, and a methodology for the assessment of urban carrying capacity (UCC) has been developed in cities, one part of which is assessing the condition of infrastructure in the urban environment. Therefore, the paper aims to study and feature this methodology, and spotlight on one of its main aspects, namely: (infrastructure and urban services). And study the plausibility of applying it to the new Egyptian cities as a way to promote sustainable urban development. This continue by studying and analyzing the current urban circumstance of one of the new urban communities' models in Egypt "tenth of Ramadan City", and afterward applying the (UCC) methodology to assess the condition of the city's infrastructure, and to identify causes of its shortcomings. Where the assessment shows that the city of “10th of Ramadan” lacks some supplies of basic facilities and services, as it does not accommodate the local population, causing the emergence of some urban problems in the city, and the weak ability to accommodate the target population. </strong>Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420200603Development of Composites from Polyester Reinforced with Rice Straw and with Hybrid Rice Straw/Glass Fiber.1119324910.21608/bfemu.2020.93249ENSoliman SolimanAli-EldinDepartment of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig UniversitySara MohamedAbd El MoezzResearcher at Faculty of Engineering - Zagazig University-Production Engineering and Mechanical Design DepartmentMona Abo ElwafaMegahedDepartment of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig UniversityWaleed SamyAbdallaDepartment of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig University; P.O. Box 44519, Zagazig, EgyptJournal Article20190521<strong>Developments in the area of natural fiber reinforced composites have based mainly on random discontinuous natural fibers. Rice straw is used as one of these discontinuous fibers. Uniform distribution of discontinuous natural fibers in composite laminates is difficult to be attained. Consequently, the purpose of this study is to develop new rice straw mat with a good distribution of rice straw fibers that reduces the discontinuity and make the mat nearly homogeneous. The rice straws are treated with 2 wt % sodium hydroxide solution then formed into a mat. This new rice straw mat is used to reinforce a polyester matrix. Hybrid composites are produced from rice straw mat and glass fiber reinforced polyester. Tensile, flexural, shear, impact, hardness, and water absorption behavior of these natural composites are investigated. Rice straw composites have higher mechanical properties than pure polyester. Hybridization enhances the mechanical properties over rice straw composites. The fracture surfaces of natural fiber reinforced polyester composites are examined by scanning electron microscope. </strong>Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420200611Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams.169500810.21608/bfemu.2020.95008ENSeleem SalehELSayedProfessor and Head of Engineering Material department, faculty of Engineering Zagazig University, Zagazig, EgyptGhada Mohamed Abd ElhadyGamiaaMSc student, Materials Engineering Dept.,faculty of Engineering Zagazig University, Zagazig, EgyptJournal Article20190103<strong>Fracture mechanics is based on the assumption that all engineering materials contain cracks from which failure starts. Structures have sizeable existing cracks that might or might not grow, depending on the load level. when a material has an existing crack, that lead to high stresses near the crack tip. Stress field type in the region of the crack tip can be defined of mode I, where two fracture surfaces are displaced perpendicular to each other in opposite direction where crack growth takes place. The crack tip stress and displacement field can be uniquely characterized by the stress intensity factor, SIF, It is neither the magnitude of stress nor strain, but it is a unique parameter that describes the effect of loading at the crack tip region and the resistance of the material. Stress intensity filed is valid for a small region around the crack tip. It depends on both the values of stress and crack size. In the present work, numerical models were designed to study the effect of specimen thickness, crack-depth ratios and concrete compressive strengths on the behavior of SIF for concrete beams. Nine beams were idealized with dimensions of 1500 mm length, 400 mm depth and different thickness 120, 250 and 400 mm. The crack-depth ratios were 0.1, 0.2 and 0.3 and the concrete compressive strengths were 25, 40 and 55 MPa. The results proved that there is a decrease in SIF with increase in specimen thickness. On the other hand; there is an increase in SIF values with increase in concrete compressive strength and crack-depth ratio.</strong>Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420200611Transient Stability Analysis of DFIGS Using Eigenvalues Analysis.1119500910.21608/bfemu.2020.95009ENMahmoud MohammedAbdelbackya master's degree program in Electric Engineering Dept., Faculty of engineering, Mansoura Univ., EgyptAhmed YoussefHatataassociated professor in Electric Engineering Dept., Faculty of engineering, Mansoura Univ., EgyptSobhy MohamedAbdelkaderprofessor in Electric Engineering Dept., Faculty of engineering, Mansoura Univ., EgyptJournal Article20190728<strong>The increasing penetration of the wind power generation into the electrical power system has led to increasing the unconventional generators into the system. The Doubly Fed Induction Generators (DFIGs) is the most common type utilized for the wind power generation. In this article, the impact of the DFIGs integration on the power system transient stability is analyzed and evaluated by using the index of the critical clearing time (CCT) and eigenvalue analysis. Moreover, the new Center of Inertia (COI) technique is used to study the effect of the integrated DFIGs on the power system transient behavior. The simulation studies are performed to compare the system transient performance with/without DFIGs integration during and after a severe grid fault. Also, they are executed to compare the transient behavior of the power system with/without replacing the synchronous generators with DFIGs. The results show a significant improvement in the transient behavior is achieved by replacing some of the synchronous generators with DFIGs of the same capacity</strong>Mansoura University, Faculty of EngineeringMEJ- Mansoura Engineering Journal1110-092344420200601The Role of Atriums and Courtyards in Improving Natural Light and Ventilation in Hospitals.1159501110.21608/bfemu.2020.95011ENEsraa SamirMahmoudDepartment of Architecture, Faculty of Engineering, Mansoura UniversityAsmaa Nasr El DinEl BadrawyDepartment of Architecture – faculty of Engineering – Mansoura UniversityMohamed Ghasoub SaafanMousaProfessor, Mechanical power engineering Department, Faculty of Engineering, Mansoura UniversityJournal Article20190616<strong>Many patients in developing countries in general, and in Egypt in particular, suffer from poor lighting and natural ventilation in hospitals. Although they help a great deal in healing patients and providing a healthy environment on the one hand, and on the other hand, they help doctors to provide a suitable workplace in order to help them to perform their duties towards the patients. The energy saving in this design.</strong><br /> <strong>The implementation of natural lighting and ventilation can help a great deal in healing patients and providing a healthy environment for them. And due to their negligence in the design of hospitals in the Arab countries, despite the importance of their application in Western countries. The aim of this research is to investigate the effectiveness of natural lighting and ventilation in hospitals to come out with a set of guidelines and standards for the design of hospitals in general.</strong><br /> The research depends on two major parts.<br /> The first part: The theoretical study of natural lighting and ventilation as well as their reflection on the health of patients and the performance of doctors in hospitals. In addition, the study of<br /> <br /> <strong><br clear="all" /> </strong><br /> <strong>internal courtyards to provide them with lighting and natural ventilation to a large extent.</strong><br /> <strong>The second part: the applied study on the hospital of the university children in Mansoura to try to improve the lighting and natural ventilation in hospitals. So, hospitals should be built on the north/south orientation and the west façade should have a low window-to-wall ratio. Then, a theoretical model was made using Fluent Anysis15 program using the equations of the amount of movement, flow and energy to find the rate of ventilation of the places where the courtyards were there, the model was solved and found that the rate of ventilation as a function in the horizontal dimension of the courtyard.</strong><br /> <strong>This indicates that the most suitable width of the courtyard should be equal to the height of the building.</strong>