Vertical Skylight Pattern Optimization for Public Spaces / Daylighting and Visual Comfort Analysis for Changing the Shape of Sawtooth Opening in Airport’s Holding Room in Cairo
قطاع الدراسات الهندسية / الهندسة المعمارية
تخصص البحث : الهندسة المعمارية
Port Said Engineering Research Journal / / VOL.22 NO 2 - September2018
Well daylit public space, which ensures visual comfort, is one of the key design goals that architects and lighting designers seek. The public space such as airport’s waiting hall is characterized by large dimensions which can get efficient daylighting levels from a skylight. In Cairo where the sunny and clear sky, improper skylight design can generate extensive heat gain and discomfort glare problems. This paper aims to study the effect of changing the vertical skylight pattern on the uniformity and availability of daylight in the public space of airport holding room. This investigation conducted through changing the shape of north oriented sawtooth opening from one rectangle opening shape to arched opening shape with multi-divisions. Generating the 3d models and analyzing the daylighting performance conducted through a parametric simulation approach. This approach included three software programs which are Grasshopper, Diva for Rhino and Evalglare. Simulations were conducted using the weather data file of Cairo, Egypt. The performance assessment was based on four metrics; IES approved method -Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE) -, Daylight Availability (DA) and Daylight Glare Probability (DGP). Results show that the different patterns of sawtooth arched opening in Cairo reached the required daylighting performance and achieved the acceptance criteria of the assessment metrics according to the daylighting requirements of LEED V4.
IMPACT ASSESSMENT OF RADIAL CHANNELS PROJECT ON WATER QUALITY STATUS IN LAKE MANZALA, EASTERN NILE DELTA, EGYPT /
تخصص البحث : الهندسة المدنية
Port Said Engineering Research Journal / / VOL.22 NO 2 - September2018
تاريخ تقديم البحث 17/10/2018
تاريخ قبول البحث 07/02/2019
عدد صفحات البحث 11
Ashraf Ali Mohamed Hassan Elhamaimi( a_elhamaimi@yahoo.com - 01015767102 ) - مؤلف رئيسي
Lake Manzala, MIKE21, Radial Channels, Water Quality Management
Lake Manzala lies on the eastern north coast of Egypt and is considered as the largest Egyptian coastal lakes. Economically, Lake Manzala is considered as one of the most valuable fish sources in Egypt. The water quality status of the lake has been degraded due to the progressive increasing of industrial, municipal and agricultural wastewater discharge from six main drains. The lake has three main effective outlets, one to Suez Canal and the others to the Mediterranean Sea. A new project has been started in Lake Manzala to improve the sea-lake water exchange by dredging the two main lake outlets to the sea and constructing two radial channels from the lake to the sea passing through the two main outlets. In this work, a hydrodynamic, advection dispersion and water quality model for Lake Manzala was developed, based on MIKE21 modelling system. Eight water quality parameters were simulated (BOD, DO, Chll_a, NO2, NO3, NH3, PO4, and TP), in addition to three hydrodynamic parameters (water depth, water temperature and salinity). The model results show good agreement with the observed water depth, water temperature, salinity and water quality records. The calibrated model was used to investigate the impacts of radial channels on Lake Manzala hydrodynamic and water quality characteristics. The results show a significant improvement in the lake water quality status. Significant decreases in the average concentrations of some water quality parameters were noticed, comparing to the original calibrated status of the lake (-21%, -14%, -13% and -10% for PO4, NO2, NH3 and Chll_a – as examples). While an increase in the average concentration of DO in the lake by about 1% was noticed. Other water quality improvement scenarios for the lake should be investigated, in addition to the investigated scenario of radial channels, using the lake developed model.
By examining the results given in table (3) and figure (4) it is clear that there is a good agreement between the results obtained experimentally as well as the results calculated theoretical and numerically using CFD model. This conclusion has proofed the validity of the purposed CFD model to be used for further and deep investigations of the behavior of the oil film in journal bearing.
The effect of wall shear stress and viscous heating on nanoscale flow properties and boundary conditions is presented. Molecular dynamics (MD) simulations is implemented to handle nano scale force-driven Poiseuille flow bounded by two parallel planner plates with liquid Argon subjected to wide range of wall shear stress. The excessive generated viscous heating is removed via adaptive thermal interacting wall model leading to nearly constant mean fluid temperature. The predicted results showed the classification of controlled and uncontrolled temperature flow mode (CTFM, UTFM) related to the capability of adjusting mean fluid temperature up to wall shear stress limit (WSSL). The relevant change of temperature profile and depletion layer thickness that depend on the applied wall shear stress is noticeable. It is clear that the change of depletion layer thickness influences the effective channel height and the average density. It is noticed the implementation of density and temperature on the change of fluid pressure in both CTFM and UTFM. Owing to the significant increase in pressure and temperature beyond WSSL, a supercritical fluid state is noticeable. The slip length and the fluid inhomogeneity are reported to be strongly dependent on the applied wall shear stress
Aluminum has become the material of choice for many types of vessels, particularly high-speed vessels where lightweight structure is important for meeting design goals. The methods of design and fabrication of aluminum contain many areas of conservatism that if overcome by proper research will lead to even greater performance at reduced cost. This paper studies the ultimate strength of Aluminum stiffened panel under combined loading conditions. A Finite Element Model had been developed based on published expermental study, this model was validated by comparing the output results with experimental work. The model calculated the ultimate strength of the panel under axial load. After validation of the model, it is used to estimate the ultimate strength of the aluminum stiffened panel under combined load. It is intended to investigate the effect of initial imperfection on the ultimate strength of the aluminum panels into the finite-element models studied. The effect of change in panel aspect ratio and the effect of column slenderness ratio are investigated. It has been found that an increase in aspect ratio affects the ability of the panel withstand any increase in load especially in case of imperfections. The analysis for the force-displacement relationships and post-collapse deformed shapes is also investigated.
Reliable Analytical Approach for Multi-taper Spectrum Sensing in Cognitive Radio Networks / Reliable Analytical Approach for Multi-taper Spectrum Sensing in Cognitive Radio Networks
قطاع الدراسات الهندسية / الهندسة الكهربية
تخصص البحث : الهندسة الكهربية
Port Said Engineering Research Journal / / VOL.22 NO 2 - September2018
تاريخ تقديم البحث 25/11/2018
تاريخ قبول البحث 07/02/2019
عدد صفحات البحث 9
AHMAD AHMAD SHABAAN DESOUKI( dessouki2000@yahoo.com - ) - مؤلف رئيسي
Heba You
cognitive radio
Multi-taper detection method (MTM) is a powerful technique in spectrum sensing for Cognitive radio networks. In this paper, reliable and simple analytical expressions for the mean and variance of the Probability Density Function (PDF) of the MTM spectrum detector are derived. Then, closed-form expressions for detection and false alarm probabilities for the MTM spectrum detector have been obtained. Intensive simulation basedworkis conducted under AWGN channel conditionsusing MATALB to confirmand evaluate the proposed theoretical study. The confirmation and the evaluation processes are designated to verify many perspectives such as: the receiver operating characteristics (ROCs), the detection rate with respect to SNR, and minimum required sample points ?(N)?_(min )to achieve a certain performance. All these perspectives are simulated undersetting of multiple Slepian tapers (K), sample points(N), and false-alarm probability (P_f). Also, a comparison with energy detection method is presented. The simulation results confirm that the proposed model is reliable and robust under all settings of the simulation parameters.
ُEnergy Harvesting / Influence of Magnetic Repulsion on Vibration Energy Harvesting
تخصص البحث : General
Port Said Engineering Research Journal / / VOL.22 NO 2 - September2018
تاريخ تقديم البحث 06/02/2019
تاريخ قبول البحث 07/02/2019
عدد صفحات البحث 7
نهال السيد حسين البدويهي( nelbedwehy@eng.psu.edu.eg - 01273218907 ) - مؤلف رئيسي
د.مجيب الرحمن أحمد الشيخ( mogeebalrahman.abdelraham@eng.psu.edu.eg - )
د.عبلة عبد القادر المغربل( aelmegharbel@eng.psu.edu.eg - )
أ.د.مصطفى هانئ عرفة( mharafa@aucegypt.edu - )
Nonlinear, Vibration energy harvester, Magnetic coupling, piezoelectric
The progress in electronic devices, including the wireless sensors, leads to the great demand on powering these devices which utilize wireless sensor systems. Recent researches focused on nonlinear energy harvesters to overcome the limitations of linearity. Magnets are a common method that used to achieve nonlinearity to the system. In this paper the effect of nonlinear magnetic force on the response of the energy harvester proposed. A model of a cantilever beam with tip magnet opposing a fixed magnet is introduced. The mathematical model predicted the response of the cantilever beam with and without the magnet effect. By changing the gap distance between the magnets, the response of the harvester investigated. Experimental work carried out to validate the results of the mathematical approach. The mathematical model shows a good agreement with experimental model results for different gap values. The results prove that magnetic force leads resonance frequency to a larger value. Tip displacement of cantilever beam changed according to gap distance (d). Without magnet, the cantilever moves freely without magnetic force constraint so maximum displacement reaches about 17 mm. In another hand, maximum tip displacement decreases by decreasing the gap distance as the magnetic force restricts free motion of the beam.
Cost Assessment of preconstruction phase for Construction Projects in Egypt / Cost Assessment of preconstruction phase for Construction Projects in Egypt
تخصص البحث : General
Port Said Engineering Research Journal / / VOL.22 NO 2 - September2018
تاريخ تقديم البحث 07/02/2019
تاريخ قبول البحث 07/02/2019
عدد صفحات البحث 12
احمد رمضان البركان( dr.eng88@yahoo.com - 01064027674 ) - مؤلف رئيسي
Ahmed Hussein( mekky1999@gmail.com - 01005814291 )
Transaction costs, pre-transaction costs, post-transaction costs, construction management, construction project.
The main premise of transaction cost economics is that project cost is not only production costs but there are also additional costs resulting from transactions between parties. Transaction costs include _but are not limited to_ the costs of preparing the bidding package, estimating and drawing up a contract, administering the contract, dealing with any deviations from contract conditions and any contractual problems include claims, change orders, and disputes. The main objective of this paper is to establish the factors that affecting transaction costs in construction projects in Egypt. The study was conducted on various types of construction projects in Egypt, which formed the sample size. To collect data, a questionnaire was used that was personally administered to the respondents, using emails and conducting semi-structured interviews. The collected data were analyzed by using SPSS program, and a software package named IBM. The findings indicated that the most important factors affecting positively (decreasing transaction cost value) on transaction cost value in construction projects in Egypt are: 1- The good financial position of the contractor 2- Lack of claims by the contractor 3- Non-substitution of materials during implementation by contractor 4- Contractor’s experience in similar type projects 5- The good relationship between the contractor and previous clients 6- Choose a more qualified contractor to do the job 7- The good relationship between the owner and contractor, designers, suppliers and government agencies 8- Implementation of the project in a stable security circumstance 9- Owner’s obligation to pay the contractor in time 10- The high efficiency of communication between project parties 11- Owner’s commitment to his orders and not change during execution 12- The high efficiency of the owner’s organization 13- Choose the appropriate procurement method 14- Calculate the project time correctly 15- Choose the appropriate delivery type
A three-dimensional Computational Fluid Dynamics (CFD) simulation for the beta-type Stirling engine is performed. Firstly, a thorough characterization of the thermal and fluid flow fields during the cycle is presented. Secondly, a comprehensive energy analysis for the engine is conducted to accurately identify the sources and magnitudes of thermodynamic losses. Computational results show a close agreement with the experimental results with an accuracy of about 96%. Within the compression and expansion spaces, the dominant heat transfer rates occur during the expansion strokes due to the significant impinging effect of the tumble vortices generated from the flow jetting. Furthermore, the jetting and ejecting processes into the regenerator is characterized by a significant temperature gradient and a large matrix temperature oscillation. The pressure difference between the expansion and compression spaces is the main driver for the flow leakage through the appendix gap. from the energy analysis, the regenerator thermal loss and the pumping power represent the largest part of the Stirling engine losses by about 9.2% and 7.5%, respectively.
A Numerical Analysis to Assess the Structural Safety of a Floating Dry Dock during a Specific Docking Operation /
تخصص البحث : General
Port Said Engineering Research Journal / / VOL.22 NO 2 - September2018
تاريخ تقديم البحث 07/02/2019
تاريخ قبول البحث 07/02/2019
عدد صفحات البحث 8
M. El-Maadawy( elmaadawy2002@yahoo.com - )
M. M. Moustafa( sasa3875@yahoo.com - ) - مؤلف رئيسي
H. S. El-Kilani( hebaelkilani@eng.psu.edu.eg - )
Adel A. Tawfeek( adil.tawfiq@gmail.com - )
Port Said Shipyard, Floating Dry Docks, Structural Modelling, MAESTRO, FEA, Docking Strength Assessment
This paper focuses on the accuracy of the “load per meter run “criterion which is used as a simple assessment for the acceptance of a specific docking operation regarding the structural safety of an unrated caisson floating dry dock. A candidate floating dock system in Port Said Shipyard is modelled in order to illustrate the procedure followed to attain a proper decision. The development of the 3D finite element model acquires the availability of the full technical data of the floating dock. All major docking operation phases are taken into account. The adequacy parameter is a good measure to detect the suspicious locations within the dock’s structure and identify the expected failure modes. The created 3D model is a useful tool that may be used in a trial and error process to attain a proper ballasting system to reduce stresses instead of rejecting the operation. The present case study had showed that the “load per meter run “criterion may be highly simplified and can be quite inaccurate specially in the critical docking operations.
جميع البيانات التي يتم تسجيلها على النظام هي ملك للجهة صاحبة هذه البيانات
لا يتم الاطلاع على هذه البيانات من قبل مهندسي المركز إلا للضرورة القصوى ولغرض الدعم الفني وبالاتفاق مع الجهة صاحبة البيانات شفوياً أو كتابياً
لا يتم إعطاء أي بيان من بيانات النظام لأي فرد او جهة فرعية تنتمي للجهة صاحبة البيانات او لأي جهة أخرى إلا بموافقة كتابية من الجهة صاحبة البيانات
يمكن استخدام البيانات المسجلة على النظام بهدف عمل إحصائيات يستفاد منها فى قياس اداء النظام وكفاءة استخدامه من قبل مستخدميه
يتم تأمين جميع البيانات الخاصة بالنظام من خلال تأمين الحاسب الخادم الذي يستضيف البيانات ومن خلال تأمين انتقال البيانات بين جهاز المستخدم والحاسب الخادم وكذلك تأمين واجهة النظام التي يستخدمها المستخدم
كل مستخدم للنظام مسئول مسئولية كاملة عن كلمة المرور الخاصة به وعليه اتخاذ كافة الاحتياطات الممكنة حتى لا يستطيع أى شخص آخر الحصول عليها
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