ORIGINAL_ARTICLE
BEHAVIOR OF SHEAR WALLS UNDER AXIAL LOAD AND CYCLIC LOAD
Reinforced concrete walls are often introduced into multistory buildings toresist lateral forces which can be exists due to winds or earthquakes. Inthe present study, six models I–section shear wall models were tested undercombined action of a constant axial load and reversal horizontal increasedloading until failure. The study has investigated the effects of someparameters such as, the height – to – width ratio, the compressive strengthof concrete, and the variation of main flexure reinforcement ratio on thebehavior of high - strength concrete shear walls. The obtained resultsfrom the tests have helped to identify the causes of wall failure modes. Thetest results included the determination of ultimate load, deflection, mode offailure, crack pattern, ductility, stiffness, and energy absorption.
https://jesaun.journals.ekb.eg/article_129373_162f88b4a28a4c8457e2b9a56293d505.pdf
2011-09-01
933
946
10.21608/jesaun.2011.129373
RC design
High strength concrete
Seismic analysis
Cyclic loading
Mostafa A.
Osman
m_osman62@yahoo.com
1
Assistant Professor of Concrete, Civil Engineering Dept., Faculty of Engineering, Helwan University, Cairo, Egypt.
AUTHOR
F. I.
Khairallah
fouad.khair@gmail.com
2
Lecturer of Structural Engineering, Faculty of Engineering - Mattaria, Helwan University, Cairo, Egypt
AUTHOR
M.
Eldemrdash
3
Professor of Properties of Materials, Faculty of Engineering - Mattaria, Helwan University, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
IMPROVING OF SOFT CLAY SOIL AROUND TUNNEL OPENNING USING STONE COLUMNS AND ITS EFFECT ON THE BEHAVIOR OF TUNNEL LINING
The increasing demand for new infrastructure developments has recentlyled to an escalating trend to develop sites with inadequate groundconditions that were previously considered uneconomical to develop.These situations have posed challenged that geotechnical engineers aremeeting by cultivating innovative techniques like stone columns toovercome soft clay soil conditions. Among the various methods forimproving in situ ground conditions, stone columns are considered one ofthe most versatile and cost-effective ground improvement techniques. Stonecolumns reinforce cohesive soils and densify granular soils in order toincrease bearing capacity and decrease total and differential settlement.The accuracy of the results obtained depends on the knowledge of the inputdata for the tunnel and the surrounding soil. Many geotechnical challengesare expected to occur related to soft clay soil stability and tunnel lining.One of these problems is expected to occur related to tunnel lining stabilityand surrounding soil is the high values of settlement due to compressibilityof soft layer when it lies around or below tunnel lining.This present study aims to improve the behavior of tunnel lining andeliminate the effect of soft clay layer on this behavior by using verticalstone columns. This study is carried out by using Finite Element Method.The tunnel lining is meshed with two dimensional elements, called BEAM 6element. The soil and stone columns are meshed with another twodimensional elements called LST, (Linearly Varying Strain TriangularElement). In this study, the main parameters were taken into considerationare the position and properties of stone columns. It can be concluded thatusing of stone columns in tunnel opening zone has strong effect on theimproving behavior of tunnel lining. For application of this study, data ofCairo Metro Tunnel- Line 2, was chosen. The results of this study werecompared with the initial values obtained from case of does not includestone columns.
https://jesaun.journals.ekb.eg/article_129375_301a8500758005f7d4ab4ff266fbcf0b.pdf
2011-09-01
947
963
10.21608/jesaun.2011.129375
improve
Soft Clay
LAYERED SOIL
STONE COLUMNS
Tunnel
Forces
deformation
F.E.M
Mostafa
Abd El-Naiem
1
Civil Engineering Department, Assiut University, Assiut, Egypt
AUTHOR
ORIGINAL_ARTICLE
THE EFFECTIVE CONFIGURATION OF RELIEF WELLS DISTRIBUTION ON THE STABILITY FOR BARRAGES FLOOR
The hydraulic structures (dams, barrages, regulators…..) arecomplicated constructions and need an accurate technical andeconomical visibility studies; prepare design, execution and effectivetechnique to be followed for maintenance.The percolation length is one of the most important items controlling thedesign of the water structures especially for apron length and thicknessSeepage under the apron of the hydraulic structures was controlled byproviding the apron with row or more of steel piles , but the sheet pilesnow is very high costs comparing by others options at the same time, andto improve the apron conditions of the old structure, the sheet piles is notpossible to implement.In present paper, an apron with multiple rows of relief wells starting byone row of relief wells till six rows of relief wells were put under testingin different arrangements .An analog model was used with variable depths and distances betweenthe relief wells rows in different arrangements. 96 runs were performedfor one row of relief wells case, 84 runs were performed for two rows ofwells case, 72 runs for three rows of relief wells case, 60 runs wereperformed for four rows of relief well case, 48 runs were done in fiverows of relief case and 36 runs were performed in six rows of relief wellscase. 429 reading node for every test run are recorded and plotted byusing the surfer software.The conclusions, from the analysis of the obtained model results was asfollows: The effective position in the potential of apron exit edge locatednear the edge of the apron for six rows of relief wells rows at (20%-30%-40%-50%-60%-80%)Lap respectively, measured from upstream of anapron. The effective percentage reduced in potential of the apron exitedge is 73% and located at the 80% from the apron total length for sixrows of relief wells (20-30-40-50-60-80). The efficiency of the U.S. reliefwells is greater than that for the D.S. relief wells.
https://jesaun.journals.ekb.eg/article_129377_97ba556015a690e93e5b8b4e3f6a7915.pdf
2011-09-01
965
983
10.21608/jesaun.2011.129377
Mohamed
Ashour
1
Professor of Irrigation- Civil Eng. Dept. Faculty of Engineering – Assiut University
AUTHOR
Mohamed
Saad
2
Emerituy profession at Hydraulic Research Institute
AUTHOR
Ashraf
Alashaal
3
Director of the Construction Institute National Water Research Center, MWRI
AUTHOR
Omran
Orabi
4
Head of Central Department of WR& I, M.SC, Civil Engineering, Assiut University, 2005
AUTHOR
ORIGINAL_ARTICLE
OPTIMAL DESIGN FOR COMPOSITE GIRDER UNDER BIAXIAL BENDING
This paper presents an efficient computer-based method for optimalcriteria design of composite girder under biaxial bending. The width,depth for concrete slab and steel section are taken as the designvariables. The strength constraints for the design are formulated usingthe finite element method. The method solves composite girders takinginto consideration the material non-linearity due to the change in stressstraincurves of steel and concrete, and geometric non-linearity due tothe change of the path of the composite girder during deformation. Theformulation depends on the principle of Virtual Work. An optimalitycriteria method is applied to minimize the cost of concrete slab, steel, andform subject to constraints on strength and stiffness. Four full compositegirder examples are presented to illustrate the features of the designoptimization method.It is shown that the design method provides an effective iterativeoptimization strategy that converges in relatively few cycles to a leastcostdesign of reinforced concrete element satisfying all relevantrequirements of the governing design code. The iterative process isinsensitive to the selected initial design and converges smoothly to a finaldesign involving concrete slab dimensions and steel section consistentwith usual design practice. A complete computer program has beendeveloped to solve the problem of full composite-beams under biaxialbending.
https://jesaun.journals.ekb.eg/article_129378_3eff72ab500e7fde6cc7f25ed7d4d105.pdf
2011-09-01
985
1003
10.21608/jesaun.2011.129378
Composite girders
Concrete-slab
Finite Element
Material and Geometric non Linearities
Incremental loading
Virtual work
Optimization
Mohamed
EL-Shaer
1
Associate Professor, Department of Civil Engineering, Higher Technological Institute, 10th of Ramadan City
AUTHOR
ORIGINAL_ARTICLE
MECHANICAL PROPERTIES OF CONCRETE CONTAINING RECYCLED CONCRETE AGGREGATES SUBJECTED TO DIFFERENT FIRE DURATIONS
The amount of construction and demolition waste has increasedconsiderably over the last few years. Crushing concrete to producecoarse aggregate for the production of new concrete is one commonmeans for achieving a more environment-friendly concrete. Thisexperimental study demonstrates the mechanical properties of concretecontaining recycled concrete aggregate (RCA) subjected to different firedurations. In the experimental work, the fresh concrete properties (slump < br />test) and the hardened concrete properties, (compressive strength,splitting tensile strength, flexural strength and modulus of elasticity)were carried out. A total of thirty concrete mixes with different cementcontents (300, 350, and 400 Kg/m3) at w/c ratio (0.5) were made and thepercentage of substitution of natural concrete coarse aggregate by therecycled concrete coarse aggregate subjected to fire durations (1,2 and 3hours) at fire temperature (600ºC) was (0%, 25%, 50% and 100%). Inthe process of mixing, equal consistence among all concrete mixes wasachieved. The obtained results indicate that the recycled coarseaggregate subjected to fire can successfully be used for makingstructural concrete.
https://jesaun.journals.ekb.eg/article_129380_8b51898eb742793c090d68a650deb28e.pdf
2011-09-01
1005
1019
10.21608/jesaun.2011.129380
recycled concrete aggregate
Fire duration
Compressive strength. Tensile strength
Flexural strength and Modulus of elasticity
Walid
Fahmy
walid.fahmy@gmail.com
1
Faculty of petroleum Engineering and Mining, Suez Canal University, Suez, EGYPT.
AUTHOR
Erfan
Heneidy
2
Civil Engineering Dept., Faculty of Engineering, Suez Canal University, Ismailia, EGYPT
AUTHOR
Esraa
Ali
3
Material Dept., Housing and Building National Research Center-Dokki- Cairo, EGYPT
AUTHOR
Ibrahim
Agwa
4
Civil Structures Dept., Faculty of Industrial Education, Suez Canal Univ., Suez, EGYPT.
AUTHOR
ORIGINAL_ARTICLE
DEVELOPING OF CONSTRUCTION CONTRACTING SECTOR PERFORMANCE IN YEMEN
The construction industry is considered one of the potential contributors tosocial and economic development in Yemen. The contracting sector, one ofconstruction industry's components, faces major challenges in organizational,technical and financial matters affecting its ability to meet the requirements forimplementing strategic projects. This paper presents suggestions andrecommendations for developing this sector and increasing its capabilities toovercome such challenges. The presented suggestions & recommendationswere reached based on studying a construction of an international footballstadium in Zingobar city of Abian governorate–Yemen as a good practice aswell as performance of contractors in other projects and government planningfor strategic projects.
https://jesaun.journals.ekb.eg/article_129381_25fb288863c42b811e4afdaad5a9690a.pdf
2011-09-01
1021
1031
10.21608/jesaun.2011.129381
Abed_Elmalek
Al-Golhy
aljolahy@hotmail.com
1
AUTHOR
ORIGINAL_ARTICLE
SOLAR COOKERS AND ITS APPLICATION FOR FOOD COOKING IN REMOTE AREAS: REVIEW
Cooking is the major necessity for people all over the world. It accountsfor a major share of energy consumption in developing countries.Therefore, solar cookers are commonly used in the domestic sector inthese countries. The advantages of the use of solar cookers would resultin the reduction of the release of CO2 in the environment. The presentwork provides the different classification of solar cookers, heat transfermechanism of cooking, and thermal performance parameters of solarcookers. A literature survey of the different experimental designs of thevarious solar cookers as well as the different materials used in thermalenergy storage has been conducted to determine the thermalperformance parameters of each type of the solar cookers. Based on thissurvey, box type solar cooker has been selected due to its simplicity ofhandling and operation which coupled with vacuum tube collector.Suitability and application of the present solar cooker system withclimate and geographic location of Taif City, Saudi Arabia will beinvestigated in future research.
https://jesaun.journals.ekb.eg/article_129391_8aad33ea98e0d0c14809f70a03017178.pdf
2011-09-01
1033
1042
10.21608/jesaun.2011.129391
solar cookers
Thermal Energy Storage
Vacuum tube collector
phase change material
Latent Heat
Sensible heat
Talal K
Kassem,
1
Mechanical Department, Faculty of Mechanical & Electrical Engineering, P.O. Box 86, Damascus University, Syria.
AUTHOR
M. S
Youssef,
2
Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut P.O. Box 71516, Egypt.
AUTHOR
ORIGINAL_ARTICLE
FACE PROFILE RECOGNITION AND IDENTIFICATION
Since the early 1990's face Recognition Technology (FRT) became anactive research area. Most of the current profile recognition algorithmsdepend on the correct detection of fiducial points and the determination ofrelationships among these fiducial points. Unfortunately, some featuressuch as concave nose, lips, flat chin, etc. make detection of such pointsdifficult and unreliable. Also the number and position of fiducial pointsvary when pose changes even for the same person. In this paper, acurvature-proposed technique is presented, which does not require theextraction of all the fiducial points, but uses information contained in theprofile. The nearest neighbor interpolation method is used to smooth theprofile and then the curvature of the interpolated profile is computed.Using the curvature coefficient values, the fiducial points, such as nasion,chin, and forehead can be reliably extracted using a fast and simplemethod. Then an Euclidean distance method is applied to match the faceprofile based on the curvature coefficient values.Experiments are performed on collected 50 clients with different ages, inpublic area. Each had three shots differences in time capture andilluminations, getting total of 150 images database, recognition rate of96.67% and conclusion are presented and discussed.
https://jesaun.journals.ekb.eg/article_129383_ffc5ddce96966e0b317cbf497a45f915.pdf
2011-09-01
1043
1054
10.21608/jesaun.2011.129383
face profile
curve fitting
Face Recognition
human features, curvature
facial extraction, facial motion
Facial Expression
nasal detection and identification
Shimaa
Hani
1
Electronics, Communications & Computer Department, Helwan University, Egypt
AUTHOR
Hesham
Keshk
2
Electronics, Communications & Computer Department, Helwan University, Egypt
AUTHOR
Mohamed
El-Adawy
3
Electronics, Communications & Computer Department, Helwan University, Egypt
AUTHOR
Tarek
El- Tobely
4
Computer and Automatic Control Department, Tanta University, Egypt
AUTHOR
ORIGINAL_ARTICLE
ADVANCED MODEL FOR PREDICTING DIELECTRIC PROPERTIES OF NANOCOMPOSITE INDUSTRIAL MATERIALS
This research studies the dielectric properties of nanocomposites, whereeach embedded spherical inclusion is surrounded by an inhomogeneousinterphase, as well as the effects of inhomogeneous interphase on the bulkmodulus of composite containing spherical inclusions. The modified modelhas been shown towards based engineering of optoelectronic packagingmaterials of dielectric constant modeling. The properties of compositematerials of the new nanocomposite industrial materials have beendeveloped in which spherical inclusions are embedded in a matrix of somekind. Different fitting models have been investigated for new industrialmaterials and improved the accuracy of their properties. The size of thespherical inclusion acts as the reinforcing phase has a major effect on thedielectric properties of composite industrial materials. Therefore, with theintroduction of nanoparticles as the preferred reinforcing phase for somecomposites, the interphase has a major effect on its dielectric properties.
https://jesaun.journals.ekb.eg/article_129384_64a0ea0d3c3d46d31b538247ea8cb1f6.pdf
2011-09-01
1055
1068
10.21608/jesaun.2011.129384
Dielectric properties
nano-composite
Industrial Materials
A.
Thabet
1
Aswan, Nanotechnology Research Centre NTRC, High Institute of Energy, South Valley University, Aswan, Egypt
AUTHOR
ORIGINAL_ARTICLE
MAP BASED INTRA-CELL METHOD FOR LOCATION PREDICTION OVER UMTS NETWORK PLATFORM
Location based services (LBS) and their applications are regarded as the mostgrowing services applied on communication systems. According to the greatenhancement in the mobile network platform and its related database servers,we are not only able to develop LBS applications but also to enhance theperformance of mobile networks. Future location prediction of mobile userresults in great enhancement in LBS applications and mobile networkperformance. Many researches were introduced to predict location of mobileuser. In [7] User Mobility Pattern (UMP) algorithm based on sequentialmining prediction has been developed to deal with future location prediction inmobile networks. The main limitations of this pattern are: map based intra cellprediction cannot be extracted and the timestamps aren't associated with rules.In [8], another method has been introduced using All frequent MovementPattern (ALLMOP) algorithm for extracting all frequent movement patternswithin movement Rule based Location Prediction method (RLP). RLP methodworks on GPS network map based platform without manipulating cell to cellmovement. So, it can't be used to enhance mobile network's resource allocationand mobility management. In this paper we proposed a new method, Intra CellMovement Prediction (ICMP), for mobile user's future location prediction onUniversal Mobile Telecommunication System (UMTS) environments to benefitfrom both intra and inter cell based techniques for both network and servicesenhancement. The proposed method depends on map based intra-cellprediction and utilizes the network database and positioning techniques inextracting user trajectories and movement rules. As a result, the user positioncan be predicted for the next movement step. The performance of the proposedalgorithm is evaluated through computer simulation and compared with that of[7] and [8]. The simulation results indicate that the proposed method is highlyefficient for both network and services' improvements as it is used to enhancelocation based services with satisfactory accuracy, network's resourceutilization, reduce the latency in accessing resources and mobilitymanagement.
https://jesaun.journals.ekb.eg/article_129386_5ce4778b19547cd8d4eb8a89571f999b.pdf
2011-09-01
1069
1094
10.21608/jesaun.2011.129386
Mohammed
Abo-Zahhad
zahhad@yahoo.com
1
Electrical and Electronics Department, Faculty of Engineering, Assiut University, Egypt
AUTHOR
Sabah
Ahmed
2
Electrical and Electronics Eng. Department, Faculty of Engineering, Assiut University, Assiut, Egypt
AUTHOR
M.
Mourad
3
Electrical and Electronics Eng. Department, Faculty of Engineering, Assiut University, Assiut, Egypt
AUTHOR
ORIGINAL_ARTICLE
EXPERIMENTAL SET UP VERIFICATION OF SERVO DC MOTOR POSITION CONTROL BASED ON INTEGRAL SLIDING MODE APPROACH
In this paper, a novel controller based on the Integral Sliding ModeController (ISMC) is proposed and designed for controlling DC motor in aservo drive. The modeling and analysis of the servo DC motor areobtained. To improve the controller performance in steady state (zeroerror), the integral sliding mode controller (ISMC) is designed andevaluated. Since the main drawback of SMC is a phenomenon, that calledchattering resulting from discontinuous controllers. An ISMC withswitched gains is used for chattering reduction and controller robustness.For comparison, the proposed ISMC with switched gains is compared withthat of a PID controller. Experimental verification and simulations havebeen carried out in order to validate the effectiveness of the proposedscheme. The proposed controller offers very good tracking, also it is highlyrobust and controlled plant reached very fast to the final position.Furthermore the application of the SM ensures reduction of the systemorder by one and quick recovery from matched disturbance in addition togood tracking. Moreover, this scheme is robust against the parametersvariations.
https://jesaun.journals.ekb.eg/article_129387_663241b7f7204c7e12230680619e6bca.pdf
2011-09-01
1095
1110
10.21608/jesaun.2011.129387
Servo DC motor
integral sliding mode control
PID controller
Ali
Yousef
drali_yousef@yahoo.com
1
Electrical Engineering Department, Faculty of Engineering, Assiut University.
AUTHOR
ORIGINAL_ARTICLE
DEVELOPING SPRING-ROLL DIELECTRIC ELASTOMER ACTUATOR SYSTEM BASED ON NEW OPTIMAL DESIGN PARAMETERS
To develop a well designed practical spring-roll dielectric elastomeractuator system, we have to optimize the design parameters of spring-rolldielectric elastomer and develop a voltage supply that is able to pump < br />enough controlled charges and provide a wide range of controlledvoltages to the actuator. In this paper, switched based multistage chargepump driven by a controlled low voltage switching power supply and avoltage driver is proposed as a wide range output voltage supply.Spring-roll dielectric elastomer optimal design parameters according to[1] areh1p=5, h2p=2, a=10. It is proven that h2p has a subtle effect on bothactuationl1 and dimensionless axial force p/mL2L3 however it has a greateffect on the applied voltage required activating the actuator.Furthermore, when l2p increases, the applied voltage decreases and theproblems of high voltage are avoided. Therefore the optimal designparameters modified to l1p=5, l2p=5, a=10 instead of l1p=5, l2p=2,a=10.In this paper, based on the equations of state, new approaches fordesigning a spring-roll dielectric elastomer actuator have been developed.The key issue of the actuation range depends upon weather the actuatorhas a fixed load or variable multi-loads.The achieved results based on the proposed approaches show that theapplied voltage has been reduced and the design of the actuator is gettingsimpler
https://jesaun.journals.ekb.eg/article_129389_12ffe770ad6c0b05a74856f6255cae19.pdf
2011-09-01
1111
1128
10.21608/jesaun.2011.129389
Spring roll dielectric elastomer actuator
Modes of Failure
optimal design parameters
switching power supply
charge pump
Medhat
Awadalla
awadalla_medhat@yahoo.co.uk
1
Electronics and Communication Dept.,Faculty of Engineering, Helwan University, Cairo,Egypt
AUTHOR
Besada A.
Anees
bessada_adib@yahoo.com
2
Industrial Training Council, Cairo, Egypt.
AUTHOR
ORIGINAL_ARTICLE
PERFORMANCE IMPROVEMENT OF A PHOTOVOLTAIC GENERATOR POWERED DC MOTOR-PUMP SYSTEM BASED ON ARTIFICIAL NEURAL NETWORKS
This paper presents the optimization of a photovoltaic (PV) waterpumping system using maximum power point tracking technique(MPPT). The optimization is suspended to reference optimal power. Thisoptimization technique is developed to assure the optimum choppingratio of buck-boost converter. The presented MPPT technique is used inphotovoltaic water pumping system in order to optimize its efficiency. Anadaptive controller with emphasis on Nonlinear Autoregressive MovingAverage (NARMA) based on artificial neural networks approach isapplied in order to optimize the duty ratio for PV maximum power at anyirradiation level. In this application, an indirect data-based technique istaken, where a model of the plant is identified on the basis of inputoutputdata and then used in the model-based design of a neural networkcontroller. The proposed controller has the advantages of robustness,fast response and good performance. The PV generator DC motor pump < br />system with the proposed controller has been tested through a step < br />change in irradiation level. Simulation results show that accurate MPPTtracking performance of the proposed system has been achieved.Further, the performance of the proposed artificial neural network(ANN) controller is compared with a PID controller through simulationstudies. Obtained results demonstrate the effectiveness and superiority ofthe proposed approach.
https://jesaun.journals.ekb.eg/article_129390_19afc5140564ed2c94bd6c78465b69c0.pdf
2011-09-01
1129
1146
10.21608/jesaun.2011.129390
Photovoltaic
Maximum Power Point Tracking
drive systems
artificial neural network controller
Ahmed M.
Kassem
kassem_ahmed53@hotmail.com
1
Control Technology Dep., Beni-Suef University, Egypt
AUTHOR
ORIGINAL_ARTICLE
cMechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut P.O. Box 71516, Egypt.
In the present study, the corrosion inhibition characteristic of SodiumDodecyl Sulfonate (SDSO), a surfactant on corrosion of carbon steel inhydrochloric acid was studied using weight loss method. The obtainedresults reveal that SDSO is good inhibitor and shows very good corrosioninhibition efficiency (IE) at relatively high SDSO concentration. The IE wasfound to vary with concentration of inhibitor and acidity.The effect of Brij 58 nonionic co-surfactant addition on IE of SDSO wasinvestigated. It was found that Brij 58 has synergistic influence on thecorrosion inhibition efficiency of SDSO. This would be attributed tomolecular association of SDSO-Brij 58 that would cause the enhancementof co-adsorption of the two surfactants on carbon steel surface andconsequently increase the coverage of hydrophobic layer on Carbon Steel(CS) surface.Special importance is attached to the effect of inorganic additives on the IEof SDSO. KCl and CaCl2 were found to be good promoters to IE of theSDSO. This finding was explained on the basis of that K+ or Ca 2+ ionswould create active sites on the SC surface that would attract thenegatively charged of SDSO ions and consequently hydrophobic layer(protective film) would be established on SC surface improving IE.However, the addition FeCl3 deteriorates the Inhibitory action(anticorrosion performance) of SDSO. This can be inferred to the formationof ferric dodecyl sulfonate that have very low soluibility product that wouldprecipitate. This cause the deficiency of surfactant ions in the solution andconsequently decreasing the adsorption of SDSO on SC surface.
https://jesaun.journals.ekb.eg/article_129394_e484b0d94f7f4f1661735cae077a665d.pdf
2011-09-01
1147
1156
10.21608/jesaun.2011.129394
Corrosion inhibition
carbon steel
weight loss
Critical Micelle Concentration (CMC)
Sodium Dodecylsulfonate (SDSO):
Synergistic effect
Shazly
Salem
1
Faculty of Petroleum and Mining Engineering, Suez Canal University
AUTHOR
ORIGINAL_ARTICLE
BOTTOM SQUATTED SETTLEMENTS VS. TOP GATED COMMUNITIES:A NEW DIRECTION OF SOCIAL SEGREGATION IN SANA'A CITY
Since 1960’s the phenomenon of urban social segregation has beendeveloped in Sana'a city in three consecutive zones. These are theindigenous, transitional and spontaneous zones. The architecture of theindigenous zone was not used as a means to express wealth and status ofthe inhabitants. The trend in the transitional zone was ‘softly segregated’.To examine the new direction of social segregation between bottomsquatted settlements and top gated communities in the fringe "spontaneouszones" of Sana'a city, this study adopted an investigatory approach andutilised multiple qualitative methods.Evidence in this paper reveals that social segregation between the well-offin gated communities and concentrated poverty in squatted settlements isblurred in the peripheral zone of the case study city.
https://jesaun.journals.ekb.eg/article_129395_51798d7a88fc901c4219f6e04d23d586.pdf
2011-09-01
1157
1174
10.21608/jesaun.2011.129395
Gated communities
squatted settlements
social segregation
Sana'a
Yemen
Abdullah
Al-Abed
dr_alabed92@yahoo.com
1
Department of Architecture, Faculty of Engineering, Sana'a University, YEMEN
AUTHOR
ORIGINAL_ARTICLE
EGYPTIAN WESTERN DESERT DEVELOPMENT CORRIDOR: A CRITIQUE ANALYSIS AND A PROPOSED CONCEPT
Since the seventies of the last century, debate over "DevelopmentCorridor" project, proposed by famed Egyptian geologist Dr. Farouk El-Baz, is mounting. Such debate has gained more momentum since the 25thof January Revolution in Egypt and reached the extent of proposing to startthe financing phase through registering the project in the stock market.However, and because of the huge investments required for this project inthis crucial stage that Egypt is going through, and in the light of the factthat many of similar projects implemented in Toshka, Abu-Tatur, EastOwianat, have failed to achieve their development objectives, it isnecessary to deeply and thoroughly examine the nature, objectives,feasibility, and the ability to implement his huge project.This paper has two main objectives: first, is to present a subjective critiqueanalysis for the project; second, is to find out rational answers for most ofits drawbacks. In reaching its first objective, the paper presents in Part 2 adiscussion of the points of agreement the paper shares with the projectidea. In Part 3, the paper presents a critique analysis for the planningconcept of the project regarding its idea, objectives, and components. Inthis regard, the research discusses the strategic impacts of the project andthen examines its adherence to basic planning principles such as:rationality, balance between costs and rewards, and developmentpriorities. Through these two parts, the paper comes to an importantconclusion that the project in its current formulation does not abide tosome necessary planning principles which makes it loses its rationality andfeasibility for the country, especially in its delicate socio-economic andpolitical conditions. In reaching its second objective, the paper proposes inPart 4 a modified planning concept for the project so as to overcome mostof its drawbacks.
https://jesaun.journals.ekb.eg/article_129396_f0bd1e4a363e7b9fd8bf38547cb97ef9.pdf
2011-09-01
1175
1194
10.21608/jesaun.2011.129396
Antar A.
Abou-Korin
1
AUTHOR
ORIGINAL_ARTICLE
USING SIMULATION FOR STUDYING THE EFFECT OF ORIENTATION ON THE THERMAL PERFORMANCE OF SPACES IN RESIDENTIAL BUILDINGS (NEW ASSIUT CITY AS A CASE STUDY)
Research, in the field of studying the effect of orientation on the ambienttemperature of residential buildings, is still in its early phases despite theleaps made by studies and experiments. Most climatic studies focused onstudying residential buildings as to: orientation, building materials use,thermal behavior, etc. This was done by theoretical studies and few on-sitemeasurements. Studying orientation of residential buildings by simulationis rare in the Arab world.The present generation of climatic design tools should rely more on digitalpresentation by computers, in order to aid designers make sound designdecisions based on visible results. Thus, the computer carries out allcalculations relieving designers from their heavy burden.Due to the scarce use of simulation software in the climatic assessment ofresidential buildings; the study aims at studying the effect of orientation onthe thermal performance of spaces in residential buildings at New AssiutCity, Egypt.To achieve this aim, the research is done by the analytical and appliedmethods, using the simulation software Thermal Analysis Software, fromthe climatic analysis of New Assiut City - as well as identifying theprevailing residential patterns, and detailed study of the selectedresidential building, identifying the software used, and analyzing thesimulation results for ambient room temperatures of the cold and hotperiods - for different orientations of the selected model. The research endswith a number of results and recommendations. Such results may beapplied in hot desert areas.
https://jesaun.journals.ekb.eg/article_129397_28058208b2423e2022e633a9edca13de.pdf
2011-09-01
1195
1212
10.21608/jesaun.2011.129397
Ahmed
Aly
ahmed.monteleb@hotmail.com
1
Tutor, Department of Architecture, Faculty of Engineering,Assiut University, Egypt
AUTHOR
Esam El-Din
Kamal Mahrous
dr_essam_mahrous@yahoo.com
2
Architectural Engineering Department, Faculty of Engineering, Assuit University, Egypt
AUTHOR
Ezzat Abd El-Moniem
Morghany
ezzatmorghany@yahoo.com
3
Associate Professor, Department of Architecture& Building Science, College of Architecture & Planning, King Saud University
AUTHOR
Essam Salah Said
Abdel Magid
essam_sss@yahoo.com
4
Architectural Engineering Department, Faculty of Engineering, Assiut University, Egypt
AUTHOR
ORIGINAL_ARTICLE
TOWARDS ENHANCING VALUES OF ACCOUNTABILITY AND TRANSPARENCY FOR ACTIVATING PARTICIPATORY PLANNING
Urban management in Egypt faces several challenges in view ofglobalization and agreements of trade and sustainability concepts so it wasnecessary for urban management to keep pace of era requirements andchallenges and fulfils its needs.Several concepts appeared that are related to progress in urbanmanagement such as partnership, time management, transparency,accountability and other concepts that began to intervene space ofapplication in communities and projects. Concept of ParticipatoryPlanning is one from these concepts which became used concepts in ourseveral national projects.Transparency and accountability are considered two main ingredients ofurban management that forms a preceding condition of sustainabilitydevelopment achievement conditions. They are two correlated conceptsthat enhance each other, accountability can't be found in absence oftransparency, if there is no accountability, transparency won't have anyvalue.So this research paper aims at finding methodological steps for enhancingaccountability and transparency in urban planning projects for activatingParticipatory Planning.Research plan depends on 4 main axes (aspects):The first axis: identifying concepts of transparency and accountability andthe requirements and indicators of applying them.The second axis: identifying concept of Participatory Planning and therequirements of applying it to find role of transparency and accountabilityin activating Participatory Planning.The third axis: conducting a questionnaire for measuring indicators oftransparency and accountability in a number of Participatory Planningprojects in slum.The fourth axis: finding methodological steps for enhancing values oftransparency and accountability of Participatory Planning projects ofslum.All development partners should follow steps that enhance values oftransparency and accountability, setting defined plans to fulfill thesevalues in participatory planning projects in slum, activating as well theseprojects’ performance and role to acquire them credibility of population.
https://jesaun.journals.ekb.eg/article_129398_723db150e3f4b4fcbc7c64c67d2a5d84.pdf
2011-09-01
1213
1238
10.21608/jesaun.2011.129398
Noha
Nabil
1
Associate Professor at Architecture Department, Helwan University, Faculty of Engineering, Cairo, Egypt
AUTHOR