2024-03-29T14:07:55Z
https://bfemu.journals.ekb.eg/?_action=export&rf=summon&issue=15305
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
A New Method of Particle Swarm Optimization Approach for Tuning PID Controller.
Amal
Moharam
Mostafa
Elhosseini
Hisham
Khalifa
This paper outlines a design method for tuning of PID controller using new algorithm based on Particle Swarm Optimization. The tuned PID controller is used in liquid level system control. Compared to different algorithms; the proposed method was more efficient. It gets the best results
particle swarm optimization (PSO)
PID controller
2020
07
05
1
15
https://bfemu.journals.ekb.eg/article_100766_a1d52b541b865e550e4a3a4b62ecb520.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Improved Hybrid SET/MOS Digital-Analog and Analog-Digital Converters.
Lobna
Osman
Sameh
Rehan
Abdel-Fattah
Abdel-Fattah
Digital and analog signal conversion circuits are important circuits as it can be used in signal processing systems, image processing and communication systems. The most researchers nowadays are interested with how to reduce power dissipation, compact circuit structure, and increase the speed of conversion. This paper present two types of improved hybrid SET/MOS DAC and ADC circuits. The SET/MOS hybrid ADC and DAC circuits have the advantages of the SET circuit and the MOS circuit. The PSPICE Recursion Relation Model (RRM) with four charge states of the SET transistor was used. The improved hybrid n-bit DAC nano-circuits are simulated (for n = 4 and 8) using Orcad Capture PSPICE simulator. The performance of the SET/MOS hybrid n-bit ADC circuits were simulated (for n = 3 and 8). The results show that the proposed improved n-bit DAC and ADC nano-circuits have the advantages of high driving capability and the enhanced swing of the output signal which is better than pure SET ADC and DAC circuits. The improved n-bit DAC nano-circuits have compact circuit structure, higher integration density, high speed, high load drivability, and low-power dissipation compared with the previously reported SET/MOS hybrid DAC.
Single Electron Transistor (SET)
MOS transistor
Nano-circuits
Hybrid
Analog-Digital Converter (ADC)
Digital-Analog Converter (DAC)
Recursion Relation Model (RRM)
room-temperature
PSPICE
2020
07
05
16
25
https://bfemu.journals.ekb.eg/article_100768_0d34201b7210f76747e68d248aa51aa2.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Optimal Allocation of FACTS Devices in Restructured Power Systems Integrated Wind Generation.
A.
Eladl
A.
Elmitwally
S.
Eskander
I.
Mansy
This paper proposes an approach to optimally allocate flexible AC transmission system (FACTS) devices in market-based restructured power systems based on Expected Benefit (EB) and installation cost of FACTS devices (FDs). The aims of the approach are minimizing device investment cost, and the locational marginal pricing (LMP) differences between buses to maximize revenue. This revenue is defined as the difference between EB with and without FACTS installation. The expected cost includes operating cost not only under normal condition but also under contingencies along with their associated probabilities to occur. The proposed method accurately evaluates the annual cost and benefits obtainable by FACTS devices installation by formulating a large-scale optimization problem that contains power flow analyses for a large number of system states representing annual power system operations. The objectives for normal state are maximizing social welfare by minimizing LMPs differences between buses and minimizing of generations re-scheduling, while the objectives in case of contingency are maximizing social welfare as well as minimizing compensations paid for generations re-scheduling and load shedding cost. The overall problem is solved using both Particle Swarm optimization (PSO) for attaining optimal FACTS devices setting and allocation as main problem and optimal power flow to calculate the operating costs and benefits as sub optimization problem. The effectiveness of the proposed approach is demonstrated on modified IEEE 14-bus test system and IEEE 118-bus test system.
Optimal Allocation of FACTS Devices
Congestion management
expected security cost
Voltage stability
OPF
LMP
PSO
FACTS Devices Investment recovery
2020
07
05
26
41
https://bfemu.journals.ekb.eg/article_100769_e0da0146b2bbcc053a902e00f95f2bdb.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
An Efficient Information-Rich Representation Scheme for Information Access and Knowledge Acquisition.
Asmaa
El-Said
Hesham
Arafat
Tremendous growth in the number of textual documents has produced daily requirements for effective development to explore, analyze, and discover knowledge from these textual documents. Conventional text mining and managing systems mainly use the presence or absence of key words to discover and analyze useful information from textual documents. However, simple word counts and frequency distributions of term appearances do not capture the meaning behind the words, which results in limiting the ability to mine the texts. This paper proposes a novel representation scheme of a semantic understanding-based approach to mine textual documents. This approach is based on semantic notions to represent the text in documents, to infer unknown dependencies and relationships among concepts in a text, to measure the relatedness between text documents and to apply mining processes using the representation and the relatedness measure. The representation scheme reflects the existing relationships among concepts and facilitates accurate relatedness measurements that result in a better mining performance. An extensive experimental evaluation is conducted on real datasets from various domains, indicating the importance of the proposed approach.
Linguistic processing
text analysis
Text Mining
Knowledge acquisition
information access
Interactive data exploration and discovery
2020
07
05
42
59
https://bfemu.journals.ekb.eg/article_100775_7065c0b9016b42b5ee387ce5bf0dd145.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Improved Microstrip Antennas with Novel EBG Structure for WLAN Applications.
Rehab
Abo El Atta
Nihal
Areed
In this paper, a novel simple compact electromagnetic band gap (EBG) configuration is proposed and analyzed using 3D finite difference time domain (FDTD) method. The proposed EBG structure consists of metallic square patches that arranged on ordered circular rings. The bandgap feature of surface wave suppression is demonstrated by calculating the transmission responses and near field distributions. From the investigated transmission curves, the surface wave bandgap is found to be 6.2 GHz and extends from 4.8 GHz to11 GHz. By inserting a 5.67 GHz patch antenna over the proposed 3-rings EBG structure, the -10 dB bandwidth has been enhanced by around 500% and the multiband ability is investigated. Further, the average value of the directivity over the wide frequency band has been improved by around 1.6 dB. On top of that, the design of 4-rings EBG structure is used to decrease the mutual coupling between two coupled rectangular patches with planar separation of quarter the wavelength by 5 dB. Much isolation between closely-packed antenna elements can be easily achieved by using more EBG circular rings. The proposed Microstrip antennas that utilize the proposed EBG structure are appropriate for WLAN applications
microstrip patch antenna
EBG structure
mutual coupling
3D FDTD
2020
07
05
60
67
https://bfemu.journals.ekb.eg/article_100776_86f8061143c45265a2678a2f0d90c268.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Optimal Planning of Fault Current Limiters for Recloser-Fuse Coordination in Distribution Systems with DGs.
Akram
Elmitwally
Eid
Gouda
Saad
Eskander
Elsayed
Adawy
In this paper, the fault current limiter (FCL) is used to restore the coordination between the protection devices in distribution systems with high-level of DG penetration. The FCL allocation may be described as an optimization problem involving multiple objective functions which are contradictory and of different dimensions. So, it is formulated as a multi-objective constrained nonlinear programming problem. The interaction among different objectives gives rise to a set of compromised solutions, largely known as the Pareto-optimal solutions. The objectives are to simultaneously minimize: the increase in fault current levels due to the penetration of DG, voltage sag, and the total cost (size) of required limiters. The optimization problem is solved using Particle Swarm Optimization (PSO). The method is applied to two distribution test systems. Effects of different operating factors are assessed and comparative analysis of results is provided.
Fault Current Limiter
Voltage sag
DG
2020
07
05
68
81
https://bfemu.journals.ekb.eg/article_100779_81733da455091e03ffe2abd8c9b8af3d.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Numerical Simulation of a White Blood Cell Motion within an Arteriole.
Mohamed
Mansour
The motion of a leukocyte (White Blood Cell) within a straight vessel, representative of an arteriole, is simulated using dynamic meshing and a six-degree-of-freedom model within FLUENT (FLUENT Inc.). The fluid is modelled as both Newtonian and non-Newtonian to simulate the bulk effects of blood. The results showed that the leukocyte lags the undisturbed velocity profile and migrates towards the centreline at all radial locations. Haematocrit is also modelled as a scalar transported by the flow and a model is introduced via a User-Defined Function (UDF) to generate a force based on the haematocrit effect. This additional forcing results in inward radial migration and outward radial migration based on the WBC radial position for the non-Newtonian case.
Blood
Leukocyte
Haematocrit
Six-degree-of-freedom model
Radial migration
2020
07
05
1
9
https://bfemu.journals.ekb.eg/article_100780_a19122aca21b25131d822d763380c8de.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Evaluation of the Performance and Emissions of a DI Diesel Engine Burning Biodiesel Produced from Used Frying Oil.
H.
El-Salmawy
E.
El- Shenawy
K.
Ismaeel
S.
El-Mozy
In this study, the effect of using Used Frying Oil Methyl Ester (UFOME) and diesel fuel mixture in direct injection diesel engine on the engine performance and emission is investigated. A reactor has been designed and manufactured for the production of methyl ester from used frying oil. Five blends at different volume proportions of diesel with the extracted methyl ester are used. The physical and chemical properties of methyl ester and its blends are measured. The experiments are carried out using a single cylinder direct injection diesel engine at the constant engine speed mode (1500 rpm) at five different engine loads. The results are compared with ordinary diesel fuel. It is found that blend B25 (25% of biodiesel in a mixture of biodiesel and Petrodiesel fuel) led to the highest brake specific fuel consumption by about (6.5-14%) compared with that when pure Petrodiesel is used. B30 gives the highest brake thermal efficiency. Carbon monoxide average emission values decreases by 32.232% for all UFOME blends with maximum average reduction of 44.4% for B10. Exhaust temperature and nitrogyn monoxide emissions are minimum at 50% engine load with average reduction of 13.38% and 10.13% ,respectively.
alternative fuels
Biodiesel
Used Frying Oil
methyl ester
transesterification
2020
07
05
10
20
https://bfemu.journals.ekb.eg/article_100783_3988e4f395941214436b516baadc9115.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
New Methodology for Achieving Trim Condition for a small Flapping Wing Air Vehicle.
Mohammed
Fanni
M.
El-Gayyar
Ahmed
Sameh
When dealing with a conventional aircraft, the design must be based on simplification assumptions, such as a cruising flight or a trimmed flight condition, which requires aircraft to have forces and moments equilibrium with respect to the center of gravity without any continuous control efforts. However, in case of ornithopters, there is no such equilibrium point due to the continuous flapping wing motion during the cruising flight. Therefore, this paper introduces a new methodology to obtain trimmed flight condition for a small flapping wing air vehicle. This methodology is based on applying initial impulsive forces to the air vehicle in such a way that the flapping wing air vehicle reaches almost constant flight speed after removing the initial impulsive forces. This enables the designer to examine the design parameters of the vehicle during realistic flight performance. A refined aerodynamic model programmed with MATLAB® is integrated into a flapping vehicle model using efficient multi body dynamics software MSC.ADAMS® to test the system. The results show perfect trimmed flight condition for a flapping wing air vehicle that never presented before in the literature.
Flapping flight
Multi-body dynamics
Flight simulation
MSC.ADAMS®
Trim condition
2020
07
05
21
31
https://bfemu.journals.ekb.eg/article_100784_fd18a1de429fcedff67a2ca44a986f6c.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Study of Heat Transfer in Energy Storage System Using Phase Change Material.
A.
Soliman
Ahmed
Sultan
M.
Mousa
A.
Ramzy
The usage of phase change materials to store heat in the form of latent heat is increased, because large quantity of thermal energy is stored in smaller volumes. A cylindrical thermal storage device is composed of an inner aluminum pipe having inner/outer diameter of 20/30 mm and length of 1000 mm. The pipe passes through a cylindrical storage device have a radius of 300 mm, fill with paraffin wax. In the present work, a numerical study of the effects of convection, number of fins and heating surface temperature on the storage characteristics of annular latent heat energy storage system (LHESS) using the CFD software FLUENT6.3.26. The results show that the effect of convection cannot be neglected, but it decreases when the space between fins decreases which occurs when numbers of fins increase. The heat transfer increases as the number fins increases and found that after 12 hours the rate of energy stored increased to 116.5% and 89.6% and 89.6% for 3 fins, 8 fins and 13 fins respectively. The temperature of heating surface is not required only to be greater than the melting point of PCM (paraffin wax) When increased to (T= 375K, 400K) found that it reduces the storage time energy to three and four hours while it is six and a half hours in the case of heating surface temperature of (T= 350 K) and increases the stored energy in the PCM to (114.4%)
CFD
phase change material
heat transfer
LHESS
2020
05
07
32
44
https://bfemu.journals.ekb.eg/article_100795_36d6f628f899285e21cba6fe9796146a.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
A Detailed Chemical Kinetic Investigation of a Tri-Component Diesel Surrogate Ignition and Combustion under HCCI Engine Conditions.
Medhat
Elkelawy
Hagar
Bastawissi
This paper presents a new tri-component diesel surrogate fuel chemical kinetic mechanism. The cross reaction mechanism between N-heptane and toluene is added to the third component detailed mechanism of cyclohexane. Based on the composition of the diesel fuel, N-heptane, toluene, and cyclohexane are selected as ideal components for this new diesel surrogate fuel. The best ratio of the selected diesel surrogate fuel components, which representing heptanes, toluene, and cyclohexane with a ratio of 8:1:1 is determined for the three suggested components. Numerically, the result obtained from a Zero-dimensional thermodynamic code for the proposed tri-component mechanism have been intensively validated against a single, and two components detailed chemical kinetic mechanism. Furthermore, the obtained results validated against the referenced experimental engine data. The obtained results of the tri-component mechanism provide a remarkable agreement between the obtained experimental data in terms of ignition delay angles. The obtained results of ignition delay angles show that the suggested chemical kinetics mechanism can capture the auto-ignition angle and the whole combustion process.
2020
05
07
45
59
https://bfemu.journals.ekb.eg/article_100796_232a6465ac147238c385ac02154b2d9d.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Experimental and Numerical Prediction of Spring back in U-bending Process.
R.
El-Bana
N.
Fouda
M.
Samuel
One of the most sensitive features of sheet metal forming processes is the elastic recovery during unloading, called spring back, which leads to some geometric changes in the product. In this paper spring back dependence on the mechanical properties of different materials and tools geometry has been examined numerically and experimentally in sheet metal U- bending test. The computer code MARC was used to simulate the U- bending process under plane strain condition. A Comparison between the experimental and the finite element simulation results also performed. A complete knowledge of the spring back phenomenon and its dependence on material and process variables is strongly required in order to develop effective real time process control systems.
U-bending
spring back
FEM
Numerical simulation
2020
05
07
60
71
https://bfemu.journals.ekb.eg/article_100801_f55031ac9edfb84baece73e9d390a2a4.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Population Density and Solar Radiation Effect on the Residential Buildings Forms: Case Study of the Graduates Villages at El -Burullus Lake.
Mokhtar
Akl
Sherif
Sheta
Ibrahim
Hegazy
This paper suggests a methodology to Burullus Lake Metopas Center regenerate Egyptian Hinterlands Graduates villages at El-Burullus Lake into sustainable neighborhoods. The study defines urban potentials for the through the analysis of current physical urban context and population densities and their needs. It focuses on the optimization of physical urban form for residential buildings. The proposed methodology introduces and analyzes alternative design models for the residential building forms with respect to residents’ needs, approaching high density population as a strategy to develop social, economic and environmental aspects of sustainability. The effect of solar radiation on design alternatives could be measured using simulation tools to develop design concepts. The conclusion of this study indicates that the morphology of a sustainable neighborhood and the solar design of its residential buildings should serve as a foundation of sustainable environment and offer suitable solutions for urban problems in similar cases.
Neighborhood Design
Urban morphology
El-Burullus lake
Solar radiations
2020
07
06
1
11
https://bfemu.journals.ekb.eg/article_101052_f9e4a78dfbed7c6cf56dc44b7a410b32.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Indoor Environment Mitigation with Desert Climatic Conditions for Affordable Passive Housing.
Mohamed
El-abosy
Osama
Farag
Wael
Moustafa
Passive architectural design is an effective strategy for affordable housing in the developed countries. The importance of passive design comes from improving indoor comfort with low cost, low maintenance, high reliability and environmental psychology effects. The difficult climatic conditions of deserts regions consider a challenge for using passively treated housing significance, simulates the indoor environment conditions are good examination for its feasibility. This research aims to study the indoor environmental adaptation capacity with the extreme outdoor conditions of desert climate. The study selects one of low-cost housing projects developed by private sector in Cairo desert; Haram-city is a new existing community located in 6th of October city and has about 70.000 housing units. Haram-city housing design is based on passive design approach of desert climate such as thick walls, low window-wall ratio, domed and vaulted rooftop. The research use digital simulation software to compare temperature degrees and air flow rates measures with indoor environmental quality standard to address mitigation ability of this case. The simulation has shown the positive effect of domed and vaulted roofs, and the negative effect of window and wall shading absence. The study results on the ability of case study to mitigate with desert climatic conditions at three levels; ground floor and north-oriented spaces are able to reach IEQ standers and west-oriented spaces need more protection from direct radiations. The study recommended using digital simulation in early design stage to get accurate predictions of building performance.
Indoor environmental quality
Desert Architecture - Passive Design
Affordable housing
2020
07
06
12
20
https://bfemu.journals.ekb.eg/article_101057_de7f024a8dedf8397d957aa574d7c93b.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Mimic Nature as a Tool for Architectural Creativity in the Future Architecture.
Amira
Gouda
Asmaa
Elbadrawy
Mohamed
Elazab
With the enormous development that the world experienced after the revolution of communications and transportation the world become a one town and all studies support the process of sustainable design but often lack the architecture formation that emanating from the place and also lacks the communication language between the various disciplines which led to the disappearance of the place imprint so we trend to nature and looking at it more comprehensively in order to reach to designs more creative and sustainable. . Biomimicry is an applied science that derives inspiration for solutions to human problems through the study of natural designs, systems and processes. Nature can teach us about systems, materials, processes, structures and aesthetics (just to name a few).the nature is larger and firmer and more objectivity sources of creativity, because they contain multiple facets of life, plant and animal, human and solids There is no doubt that the nature created by God Almighty an important role in the creative process, it is a real art teacher for humans.
مفردات البيئة
الطبيعة
مستويات المحاکاة
2020
07
06
21
28
https://bfemu.journals.ekb.eg/article_101059_3f07791e1da08b9ddfc8fe9d8f1b3c8d.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Sustainability Systems and Criteria (University of Baghdad an Analytical Model According to LEED Standards.
Qubad
Haseeb
M.
Elazab
A.
Eleashy
The concept of sustainable architecture and intellectual horizons related considered one of the more orientations modern architecture that have emerged in recent times for the formation of the urban environment, through efforts to mitigate change climate by studying the correlation between man and the ocean environment, linked to the same time Urban culture for community and environmental realities. This trend of trading Find the intellectual aspects of sustainability during the formation of sustainable architecture and economic aspects of the thought of sustainability and future prospects of the development of this concept. The study assumes that the foundations and principles that launched them sustainability in harmony with urban design, which focused on environmental realities and studied the effects of climatic and social environment is linked at the same time composition optimization of the elements of architectural emanating from the local architecture and using them optimally, without neglecting the economic aspects and factors affecting the other. Hence the choice of the University of Baghdad, an analytical model to LEED standards, although the design of the University of Baghdad, came in the late fifties of the last century and through the great architect Walter Gropius (1883-1969) where he showed his convictions dedicate design, schematic cross-system crossing involves a malformed graphic elements identical in architectural language with other elements characterized by its processors to design a great deal of excellence and excitement.
2020
07
06
29
48
https://bfemu.journals.ekb.eg/article_101063_7b700fc0d05a749311d30e0c017a831f.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Emissions of Gases and Particulate Matter from Cement Plant (Case El-Mergheb Cement Factory).
Mahmoud
Mahmoud
Ibrahim
Al-Alm
Kasem
El Alfy
Hamdi
Abdel-Salam
Estimated emissions of gases and particulate matter from Portland cement plant near Khoms city in northwestern Libya by The use of the application program (READY), which was produced by the (United States National Oceanic and Atmospheric Administration) application calculates the contaminated concentration of a number of points (x) and (y) about the source of emission of pollutants circle diameter (20 km), reveal that the gases emissions and dust emissions exceed selected Egypt standard limits. The results highlight the need for improved operational procedures to minimize emissions and avoid any possible adverse environmental effects.
Co
Co2
SO2
NOx
PMS
AIR POLLUTANTS
Emissions
cement
Mergheb
2020
07
06
1
14
https://bfemu.journals.ekb.eg/article_101064_317bb60a2f57aeb4a0ad88ac1d03a3c1.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Wave Hydrodynamic Characteristics of Vertical and Sloped Seawalls.
Kasem
El Alfy
O.
Rageh
K.
Nassar
The hydrodynamic performance of vertical and sloped plane, rectangular serrated, and triangular serrated seawalls were investigated experimentally in terms of wave reflection coefficient, kr, relative wave run-up, Rup < /sub>/Hi, and relative wave run-down, Rdown/Hi, using physical model studies. Regular waves of wide rang of heights, and periods were used. Tests were carried out for different inclinations of seawall (i.e. ), relative dissipater blocks spacing (s/w =1.0, 2.0, 3.0), and a constant water depth of 0.4 m. It was observed that the rectangular serrated seawall was superior to the triangular serrated and plane seawall in reducing the hydrodynamic parameters mentioned above. As well it was found that the relative spacing of dissipater blocks, s/w, wave steepness, Hi/Li, and the relative water depth, d/Li were better influencing parameters compared to the surf similarity parameter (Iribarren N0), in predicting the wave hydrodynamic parameters. Both rectangular and triangular serrated seawalls gives a good results for all hydrodynamic parameters when, s/w=2.0 compared to s/w equal to1.0 and 3.0. A total performance evaluation was done in terms of a single parameter called hydrodynamic performance parameter, and it was found that for s/w=2.0, both rectangular and triangular serrations reduces this parameter by about 37% and 28% respectively compared with the plane seawall. The worst results for performance parameter were observed when , while the optimum values occur when, s/w equal to (2.21-2.27), and (2.34-2.41) for the rectangular and triangular serrated seawalls respectively. Simple predictive equations were developed for estimating the wave reflection coefficients, relative run-up, and relative run-down by using non-linear regression analysis by SPSS.16 (SPSS Inc, 2006) software.
Regular waves
Wave hydrodynamics
Wave breaking
Iribarren No
Seawalls
2020
07
06
1
18
https://bfemu.journals.ekb.eg/article_101067_7b23a0231d02b6c1418ba4859684cd20.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Use of Geogrids in Flexible Pavement Reinforcement.
Eman
Ibrahim
Sherif
El-Badawy
Mourad
Ibrahim
Effectiveness of geogrids as a reinforcement of the cross section of flexible pavement system was investigated. The study involved conducting of routine as well as advanced laboratory testing for comprehensive material characterization. It also included testing five large-scale pavement sections in the laboratory. These sections consists of a 5 cm asphalt layer (AC), 15 cm granular base layer, and a 30 cm clay subgrade. Five pavement sections were tested. The large-scale pavement sections were instrumented with strain gauges at different depth within the base layer. The base layer was reinforced with a single layer of RE540 uniaxial Tensar geogrid placed at four different positions within the base layer, one position at a time. These positions were 1) at the interface between the base and subgrade (B0), 2) 5 cm from the bottom of the base layer (B1/3h), 3) the middle of the base layer height (B1/2h), 4) and finally at the interface between the AC and base (Bh). These pavement sections were loaded with a static plate loading equipment until failure and the results were compared with the control section (CS) which had no reinforcement. Results from this study showed that geogrid can be used to improve the performance of flexible pavement systems. The position of the geogrid in the pavement system affects the performance significantly. The optimum position of the geogrid reinforcement to improve the pavement fatigue life was found to be directly underneath the AC layer then within 33 to 50% of the granular base layer height measured from the bottom of the base layer.
Geogrid
reinforcement
Resilient Modulus
Tensile strain
Large-scale laboratory test
2020
07
06
19
30
https://bfemu.journals.ekb.eg/article_101068_8e0e662f6dda83817079a5efbb286a86.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Modeling of Noise Pollution due to Traffic Movement in Mansoura City.
Sania
Elagmy
Sayed
Shwaly
Sherif
El-Badawy
Noise is one of the most significant sources of environmental pollution in the metropolitan areas. It negatively affects human health, hearing, sleep and sometimes leads to high blood pressure. Road traffic noise is the main source of environmental noise pollution in urban areas. This paper presents a predictive road traffic noise model for Mansoura city based on field noise measurement and different traffic composition and volume. The proposed model has six explanatory parameters. These parameters are (total traffic vehicle count (Q), Number of lanes, lane width, median width, percent of medium vehicles, and percent of heavy vehicles).The model yield highly accurate noise predictions with coefficient of determination (R2 of 0.94).A sensitivity analysis using the proposed model showed that the most significant parameters on predicted noise levels are the total traffic volume and median width. The proposed road traffic noise model can be effectively used as a decision supporting tool for prediction of road traffic noise in Mansoura City and similar cities in Egypt
Noise
Traffic volume
Heavy vehicles, Motorcycles
regression
2020
07
06
31
40
https://bfemu.journals.ekb.eg/article_101075_a6d5f045b920179c78d42f66eaf16ce7.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Critical Buckling Load of Laced Columns.
Youssef
Agag
M.
Naguib
M.
El-Tantawy
Alshimaa
Ahmed
The aim of the present work is to investigate the effect of the detailed arrangement and dimensions of the lacing bars on the actual value of the critical buckling load of a Laced Column having four legs. The critical buckling load is calculated in order to reach for the best arrangement of lacing systems to use them as a one main structural element and main component for skeleton used for covering a long span systems. The study is carried out for four different forms of lacing arrangement and two different forms of restraints taking the effect of inertia of the gusset plate for a laced column into account when calculating its critical buckling load. A computer program constructed by [1] which is based upon the minimizing of total potential energy by the conjugate gradient technique and the method of Stiffness Curve created by the author is used for this study. This good preliminary technique is examined using Sap2000 program and the results are in a good agreement.
Laced Column
Critical Buckling Load
Gusset Plate
Euler Load
2020
07
06
41
57
https://bfemu.journals.ekb.eg/article_101077_7acd38e012f99546e7d2ae4226c0fc14.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Studying the Reliability in Multi-Objective Management of Groundwater under Uncertainty of Hydraulic Conductivity Values.
Hamdy
El-Ghandour
Samer
Elabd
Groundwater is considered as an important source of freshwater for several purposes. The increasing demand of groundwater has resulted in an indiscriminate of this source causing environmental hazards such as decline of groundwater levels and well interference. This paper presents a new methodology for optimal management of groundwater in unconfined aquifers in case of uncertainty due to spatial variability of hydraulic conductivities. The suggested methodology includes application of two main consecutive approaches. In the first approach, Monte Carlo simulation is adopted to generate multiple realizations of the hydraulic conductivity values depend on limited field measurements, then a simulation-optimization model is developed and applied to solve the groundwater management problem for each realization. The results of the simulation-optimization model are several Pareto-front optimal solutions for each realization. A unique Pareto-compromise solution for each Pareto-front is determined. In the second approach, to assess the reliability analysis, Pareto-compromise solutions are divided into groups according to the number of wells to detect the most reliable number of wells. The most reliable locations of wells (also their discharges) are detected by splitting these Pareto-compromise solutions into groups according to a new suggested term called radius of gyration. For each group, the performance/state function is assumed as a function of the two objectives corresponding to each Pareto-compromise solution. Then, Monte Carlo simulation, Latin Hypercube sampling, and First Order Reliability Method are applied to study the reliability of the estimated function corresponding to each realization. The methodology is then illustrated by the application on the Quaternary Aquifer of Wadi El-Tumilat, Egypt. The proposed methodology shows its ability to suggest only one system of wells of high level of reliability.
Reliability
multi-objective optimization
uncertainty
Unconfined aquifer
Hydraulic Conductivity
Genetic Algorithm
Finite element method
Quaternary aquifer
2020
07
06
58
73
https://bfemu.journals.ekb.eg/article_101078_9133017cf3fbff35de5f2248e01e98f1.pdf
MEJ- Mansoura Engineering Journal
1110-0923
1110-0923
2015
40
1
Controlling of Saltwater Intrusion Using Injection Wells (Case Study: Quaternary Aquifer of Delta Wadi El-Arish, Sinai).
Kasem
El Alfy
Hamdy
El-Ghandour
Mahmoud
Abd-Elmaboud
Groundwater contamination is a very serious problem as it leads to the deterioration of groundwater resources. Saltwater intrusion is a special category of groundwater contamination that threatens the health and possibly lives of many people living in coastal areas. The installation of injection of treatment water is among several methods proposed to control saltwater intrusion on coastal groundwater system. In this research, a two-dimensional numerical model is developed for simulating both groundwater flow and saltwater intrusion of Quaternary Aquifer in Delta Wadi El-Arish (QADWA). The sharp interface philosophy is adopted to simulate dynamics of freshwater flow. The proposed model applied a coupled Finite Element Method (FEM) and Finite Difference Method (FDM) to predict the temporal migration of interface toe due to injection of treatment water. Model calibration is carried out to determine the physical parameters of the proposed model. Then, model verification and validation are established by comparing model results with the actual measurements. This study is considered a trial to present a solution for the problem of saltwater intrusion by finding general relationships between average distances of saltwater intrusion and injected rates of treatment water. Then, the suitable value of recharged water can be mathematically determined. The results obtained from this study are useful in management schemes of saltwater intrusion mitigation in coastal areas.
Saltwater intrusion
Finite element method
Sharp interface
Injection wells
Quaternary aquifer
2020
07
06
74
92
https://bfemu.journals.ekb.eg/article_101079_3de745f8eb0bb34eafb08377bf35684a.pdf