EXPERIMENTAL STUDY OF THE BEHAVIOR OF THE CONVEX CONTACT SHAPE STRIP FOOTING ON SAND
Abdel Megeed Kabasy
Mohamed
Associate professor, civil Eng. Dept., Faculty of Engineering, Assiut University, Egypt
author
text
article
2013
eng
The behavior of the strip footing on sand was deeply studied in many publications. They were trying to improve this behavior through many techniques. These improvements include the using of geogrid and geotextile reinforcement, skirts on the sides of the footing to elongate the contact surface of the footing with soil. None of these studies had implemented in the effect of the contact shape of the footing on its behavior. In this present experimental study, it is intended to observe the behavior of the convex strip footing on sand with different strip footing contact shapes. A series of experiments using different convex strip footing contact shapes, are carried out on sandy soil. The results showed that the increase in the strip footing contact areas, did not increase the bearing capacity, but decreases the ultimate bearing capacity load from about 30% to 60%. Also with sever convex curve, the ultimate load decreases seriously.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
290
301
https://jesaun.journals.ekb.eg/article_114727_a7cf48f6fa7d28d090aed7a5d6b12c16.pdf
dx.doi.org/10.21608/jesaun.2013.114727
FLOW ANALYSIS AROUND GROYNE WITH DIFFERENT PERMEABILITY IN COMPOUND CHANNEL FLOODPLAINS
Ahmed H.
S.
Department of Civil Eng, Faculty of Engineering, South Valley University, Qena, Egypte
author
G. A.
Abd El-Raheem
Professor of Hydraulics and Water Resources, Department of Civil Engineering,
Assiut University, Assiut 71516, Egypt
author
N. A.
Ali
Professor of Hydraulics and Water Resources, Department of Civil Engineering, Assiut University, Assiut 71516, Egypt
author
A.
Tominaga
Professor, Department of Civil Engineering, Nagoya Institute of Technology, Gokiso-cho, Nagoya 466-8555, Japan
author
Safia Mohamed
Khodary
Post Graduate Student, Aswan University, Egypt
author
text
article
2013
eng
Presented herein are the results of an experimental study on the flow characteristics around compound channel floodplain groynes with various permeability and length. Both the permeable and impermeable groynes are considered to clarify the influences of floodplain groynes on flow structure, velocity, and water surface. A channel consisting of a main channel and one floodplain with flat and fixed bed was used. The width of floodplain is the same as the main channel width. Pile groyne models with three different relative lengths relative to floodplain width (Lr), 0.5, 0.75, and 1.0, with three different permeability values (P= area of water crossing the groyne/total projected area of groyne) 40%, 60%, 80% plus an impermeable groyne were used and installed in the floodplain with single arrangement. The 3D flow velocities at both of the horizontal plane above floodplain bed by 0.25 of floodplain water depth (h) and at the main channel centerline in the vertical plane were measured using an Acoustic Doppler Veloci-meter (16 MHz Micro-ADV). The flow pattern around groynes was analyzed in both the horizontal and vertical planes. The results show that, for permeable groynes as the permeability increased the groyne length has limited influence on the flow structure. For the horizontal plane maximum and tip velocities were decreased while the minimum and bank velocities were increased as the permeability increased. Empirical formulas to describe these relations depending on the groyne relative length and permeability were suggested. The influence of permeable groynes installation in the compound channel has insignificant effect on the main channel flow while the impermeable groynes affect greatly the main channel flow structure. Both the groyne permeability and length ratio have obvious effects on the floodplain water depth.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
302
320
https://jesaun.journals.ekb.eg/article_114731_82ff2eb99b288f9f099d4227a97e289a.pdf
dx.doi.org/10.21608/jesaun.2013.114731
STATIC BEHAVIOUR OF DIFFERENT TYPES OF R.C BEAM-COLUMN CONNECTIONS AS AFFECTED BY BOTH VALUE OF ACTING AXIAL NORMAL FORCE AND GRADE OF USED CONCRETE (THEORETICAL STUDY)
Abdel Rahman M.
Ahmed
Civil Engineering Department, Faculty of Engineering, Assiut University
author
Mohamed M.
Rashwan
Civil Engineering Department, Faculty of Engineering, Assiut University
author
Lamiaa K.
Idriss
Civil Engineering Department, Faculty of Engineering, Assiut University
author
text
article
2013
eng
This paper describes a theoretical study of the effect of both acting axial loads and grade of concrete on the static behaviour of (32) thirty two Reinforced Concrete (RC) Beam-column joints. ABAQUS\CAE version 6.7, a nonlinear finite element analysis software package, was developed specifically for the analysis of reinforced concrete structures under plane stress conditions. Variable axial loads were applied and increased gradually with constant lateral load, which was applied maintaining at the top of the column at internal and external beam-column joint only the ultimate and cracking axial loads were recorded as well as the corresponding versus vertical displacement, the maximum joint shear stresses, axial, stresses strains, and absorbed energy, mode of failure using different grades of concrete C250, C400, C600 and C1200 were evaluated and recorded.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
321
364
https://jesaun.journals.ekb.eg/article_114734_44c50486de4d6eee6598ae1810f09b20.pdf
dx.doi.org/10.21608/jesaun.2013.114734
SIMPLIFIED CHARTS FOR OVERLAYING DESIGN OF FLEXIBLE REPAVED ROADS STRUCTURE
Mostafa Deep
Hashem
Civil Eng Department, Faculty of Engineering, El-Minia University, El-Minia, Egypt
author
text
article
2013
eng
The roads need to be repaved are those possessing a lot of damage, rutting causing many problems for vehicles and drivers. Two methods of repaving roads are introduced in this paper. The first method includes constructing two layers of pavement structure above the road directly without removing the old wearing surface of this road. The second includes constructing the same two layers of pavement structure above the road after removing the old wearing surface to the surface of the old base course. The two layers are leveling layer from crushed aggregate and new overlay surfacing layer from asphaltic concrete. The effect of these layers is to reduce the stresses and deflections to permissible limits of old foundation. This piece of paper uses the elastic theory and Excel program to establish an approach for overlaying design of flexible repaved road structure. Using this approach, the designer may be able to determine the suitable thicknesses of pavement layers of overlaying flexible repaved road structure.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
365
381
https://jesaun.journals.ekb.eg/article_114738_0ed1900e650062bd5e48c98871017b9c.pdf
dx.doi.org/10.21608/jesaun.2013.114738
ESTIMATE OF FLOOD WATER QUANTITIES EXPERIENCED BY DHUKNA CITY, QASSIM REGION, KSA
M. M.
Elfiky
Prof. Of Hyd., Head of Water & W.Str. Eng. Dept., Fac. Of Eng., Zagazig Univ., Egypt
author
A. A.
Habib
Lecturer, Water & W.Str. Eng. Dept., Fac. Of Eng., Zagazig Univ., Egypt
author
E.
Elnikhily
Lecturer, Water & W.Str. Eng. Dept., Fac. Of Eng., Zagazig Univ., Egypt
author
text
article
2013
eng
Flood water dangerous are increasing worldwide as a result of frequent recurrence of large floods in many areas due to severe climatic changes taking place in the world in recent times and their impact on rainfall intensities and duration periods. Three years ago Dhukna city exposed to an extreme storm, which leads to that the right bank of the great valley passing on the Eastern side, U\S of the main culvert, has been collapsed. In addition, the water surface has been recorded to be passing over the main culvert (32 vents each of 2.5m x 1.5m) by more than one meter. The present paper introduces a study for the hydrological characteristics of Dhukna city, Qassim region, KSA, as one of the cities expected to be exposed to dangerous of floods due to a steady civil development in the different utilities, especially asphaltic surface roads areas. The characteristics of the different drainage basins spill its water to the city, have been well defined. The SCS-CN method has been used to estimate the flood water quantities for all surrounding drainage basins which drain its water directly to the main valley, especially that passing through the city. Also, the performance of the existing main culvert is evaluated and its efficiency has been checked. A proposal has been suggested to increase the main culvert efficiency and to accommodate the expected incoming flood water through the great valley.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
382
394
https://jesaun.journals.ekb.eg/article_114739_0db230dfffe76dd973c17afb3d89469a.pdf
dx.doi.org/10.21608/jesaun.2013.114739
SOME PARAMETERS AFFECTING THE STATIC BEHAVIOR OF NORMAL STRENGTH RECTANGULAR R.C. SHORT COLUMNS CONFINED BY CFRP
Abdel Rahman
Megahid
Civil Eng. Department, faculty of Engineering, Assuit University, Assuit , EGYPT
author
Omar Ahmed
Farghal
Civil Eng. Department, faculty of Engineering, Assuit University, Assuit , EGYPT
author
Mahmoud Mohamed
El-Taher
Consulting Engineer , Luxor , EGYPT
author
text
article
2013
eng
Changing social needs, upgrading of design standards, increasing safety requirements and deterioration are some of the reasons that make the existing reinforced concrete structure ( such as bridges and buildings) need to be strengthened or repaired . Over the past several years, there has been a concerned research efforts to explore the strengthening effect of Carbon Fiber Reinforced Polymer (CFRP) laminates applied to reinforced concrete columns under centric loading . So, the main objective of this work is to identify the main parameters affecting the mechanical behavior of confined rectangular R.C. columns such as the confinement level and rectangularity ratio (t/b ratio) . The efficiency of externally bonded CFRP of rectangular R.C. columns is declared and evaluated . [1,2,3].
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
395
420
https://jesaun.journals.ekb.eg/article_114741_3ff031036adf85d9bfc746b4be167a65.pdf
dx.doi.org/10.21608/jesaun.2013.114741
PERFORMANCE OF A LOCAL PROPOSED ECONOMICAL ADDITIVE ON THE CEMENT MORTAR PROPERTIES AFFECTED BY AGGRESSIVE ENVIRONMENTAL CONDITIONS
A. Megahd
Ahmed
Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
author
M. M.
Rashwan
Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
author
Mostafa
A.Razek
Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
author
text
article
2013
eng
Admixtures have long been recognized as an important components of concrete used to improve its performance. The original use of admixtures in cementitious mixtures is not well documented. It is known that cement mixed with organic matter was applied as a surface coat for water resistance or tinting purposes. It would be a logical step to use such materials, which imparted desired qualities to the surface, as integral parts of the mixture. The use of natural admixtures in concrete was a logical progression. Materials used as admixtures included milk and lard by the Romans; eggs during the middle ages in Europe; polished glutinous rice paste, lacquer, Tung oil, blackstrap molasses, and extracts from elm soaked in water and boiled bananas by the Chinese; and in Mesoamerica and Peru, cactus juice and latex from rubber plants. The Mayans also used bark extracts and other substances as set retarders to keep stucco workable for a long period of time. (ACI Education Bulletin E4-03) Chemical admixtures confer certain beneficial effects on concrete, including reduced water requirement, increased workabi1ity, control led setting and hardening, improved strength and better durability. Many approaches have been adopted to investigate the role of chemical admixtures. One approach is to determine the state of the admixture in concrete at different times of curing. The admixture may remain in a free state as a solid or in solution, or interact at the surface or chemically combine with the constituents of cement or cement paste. The type and extent of the interaction may influence the physico-chemical and mechanical properties of cement paste. In this paper an attempt is made to discuss experimentally the performance of a local proposed economical additive on cement mortar affected by aggressive environmental conditions.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
421
440
https://jesaun.journals.ekb.eg/article_114743_ed66bcbcc4314b0f2b3e3b733b966647.pdf
dx.doi.org/10.21608/jesaun.2013.114743
CONTRIBUTION OF NON-STRUCTURAL BRICK WALLS DISTRIBUTIONS ON STRUCTURES SEISMIC RESPONSES
Hamdy H. A.
Abd el-Rahim
Associate Professor, civil eng department, Faculty of Engineering, Assiut University
author
Ahmed Abd El-Raheem
Farghaly
Lecturer, Faculty of Industrial Education, Sohag University
author
text
article
2013
eng
Using of masonry infill as partitions, in flat slab frame buildings is a common practice in many parts of the worlds. The infill is, generally, not considered in the design and the buildings are designed as bare frames. More of fundamental information in the effect of masomary infill on the seismic performance of RC building frames is in great demand for structural engineers. Therefore the main aim of this research is to evaluate the seismic performance of such buildings without (bare frame) and with various systems of the masonary infill. For this purpose, thirteen three dimensional models are chosen and analyzed by SAP2000 program. Nonlinear time history analysis recommended by Egyptian code for seismic load of building structures was used (ECOL 201, 2008) [31]. In this study the stress strain relation model proposed by Crisafulli [7] for the hysteric behaviour of masonary subjected to cyclic loading is used. The results show that the nonstructural masonary infill can impart significant increase global strength and stiffness of such building frames and can enhance the seismic behaviour of flat slab frame building to large extent depending on infill wall system. As a result great deal of inspirit has been obtained on seismic response of such flat slab buildings which enable the structural engineer to determine the optimum position of infill wall between the columns.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
441
482
https://jesaun.journals.ekb.eg/article_114744_9e34f879b69f159a9e09a8bd44a85405.pdf
dx.doi.org/10.21608/jesaun.2013.114744
INVESTIGATION INTO TUBULAR STRUCTURE FORMED BY PITTING CORROSION ON THE SURFACE OF CARBON STEEL
Tawfeeq A.
Alkanhal
Research Center director of Engineering and Applied Science, Faculty of Engineering, Majmaah University, Saudi Arabia
author
M.
Osman
Mechanical Engineering Department, Faculty of Engineering, Majmaah University, Saudi Arabia
author
S. M.
Ahmed
Mechanical Engineering Department, Faculty of Engineering, Majmaah University ,Saudi Arabia
author
text
article
2013
eng
The formation and development of pitting corrosion on carbon steel surface during the initial stage of immersion test in tap water have been studied by scanning electron microscopy. The pitting was analyzed for static and rotating specimens during immersion. The results showed that the features of the pits formed on the surfaces of samples that are rotating are different from those on the surfaces of static samples. Since the rotating-pit samples were followed by a tubular structure of corrosion products in the reverse direction of rotation. The results showed also that this tubular structure depends on the size of the pit and test time. Moreover, this tubular structure plays an important role in the development of damage to the surface. This shows that the corrosion products have a hostile influence. Interactions localized corrosion pits occurred between large and small pits in its configuration, as well as between the tubular structures. The features of formed pits were a cavity at the center of the pit and a rough circular band or ring of products around the cavity.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
483
500
https://jesaun.journals.ekb.eg/article_114745_8b7d613d534973379a5c8a32dd727f16.pdf
dx.doi.org/10.21608/jesaun.2013.114745
DESIGN OF RUBBER FATIGUE BEHAVIOUR TEST RIG
Abdullah
Mohammed
Mechanical Engineering Department, Assiut University, Assiut, Egypt
author
Karam M.
Emara
Mechanical Engineering Department, Assiut University, Assiut, Egypt
author
Mahmoud M.
Nemat-Alla
Mechanical Engineering Department, Kafrelsheikh University, Kafrelsheikh, Egypt
author
text
article
2013
eng
Fatigue behaviour of rubber is a very important characteristic due to its extensive use in many engineering applications. In applications, rubber is commonly subjected to fluctuating loads, which often lead to fails due to the nucleation and growth of defects or cracks. Many factors are known to influence the mechanical fatigue life of rubber components. There were a lot of researches that investigated the fatigue of rubber and the factors that affect the fatigue behaviour, by using many different apparatuses and arrangements. Such apparatuses and arrangements generate cyclic loading on the rubber specimen, which leads to nucleation and crack propagation to failure. In present work a new test rig has been designed and manufactured to carry out laboratory rubber fatigue test. The introduced test rig has been tested and proved to be reliable and has good repeatability.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
501
516
https://jesaun.journals.ekb.eg/article_114746_33ed5d87fb83c94c6cd024a24ac11a74.pdf
dx.doi.org/10.21608/jesaun.2013.114746
FRACTAL CHARACTERIZATION OF CAVITATION DAMAGE OF CARBURIZED AISI 5117 STEE
B.
Saleh
Mechanical Eng Department, Faculty of Engineering, Assiut University, Assiut, Egypt
author
Tawfeeq A.
Alkanhal
Research Center director of Engineering and Applied Science, Faculty of Engineering, Majmaah University, Saudi Arabia
author
S. M.
Ahmed
Mechanical Engineering Department, Faculty of Engineering, Majmaah University ,Saudi Arabia
author
text
article
2013
eng
The cavitation erosion of carburized and untreated low alloy steel (AISI 5117) has been investigated during the incubation period. Scanning electron microscope images of eroded surface were obtained, forming a data base for further analysis. It has been shown that carburizing can effectively improve the cavitation erosion resistance of AISI 5117 low alloy steel and prolong the incubation period. The fractal dimension and Fourier intercept values can be used to characterize the cavitation damage. The fractal dimension and Fourier intercept value for the untreated surfaces were higher than that of the carburized surfaces.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
517
542
https://jesaun.journals.ekb.eg/article_114747_65bd22159a4a590e5698a62d8d01623b.pdf
dx.doi.org/10.21608/jesaun.2013.114747
PROGRESSIVE IMAGE TRANSMISSION OVER OFDM SYSTEM
Usama
Sayed Mohammed
Electrical Engineering Department,Faculty of Engineering,Assiut University,
Assiut, Egypt
author
Osama A.
Omer
Aswan Faculty of Engineering, South Valley University, Aswan, Egypt
author
Ahmed S. A.
Mubarak
Egyptian Telecommunications
author
text
article
2013
eng
A modified Orthogonal Frequency Division Multiplexing (OFDM) system for robust progressive image transmission is proposed in this paper. A joint source-channel coder (JSCC) is employed in the modified OFDM system. The set partitioning hierarchical trees (SPIHT) used as source coder, and The Low-Density Parity-Check (LDPC) used as a channel coder. The SPIHT coder is modified to generate four different groups of bit stream relative to its significances. An unequal error protection (UEP) is suggested for data groups with the LDPC coder. Also, the modified OFDM system includes an adaptive clipping technique as a Peak to average power ratio (PAPR) reduction technique for OFDM signal. This proposed PAPR reduction technique is based on adaptive clipping for the amplitude of the input signal, where each of signals related to the different four groups of the modified SPIHT coder is clipped with a different clipping level according to the group sensitivity. To demonstrate the efficiency of the modified OFDM system with proposed PAPR reduction technique, the simulation results are presented based on bit error rate (BER), the Peak-signal-to-noise ratio (PSNR) and PAPR over AWGN channel. Based on the simulation results, the proposed structure provides a significant improvement in BER and PSNR performances and a reduction in PAPR is achieved.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
543
557
https://jesaun.journals.ekb.eg/article_114748_909689df65bd2f3a3103f2c6c327850d.pdf
dx.doi.org/10.21608/jesaun.2013.114748
VOLTAGE AND CURRENT HARMONIC SUPPRESSION BY SHUNT ACTIVE FILTER FEEDING DC LOAD ON DC LINK
Gaber
El-Saady
Power Engineering and Machines Department, Faculty of Engineering, Assiut University, Asyut, Egypt
author
Ashraf
Hemeida
Electrical Engineering Department, Faculty of Energy Engineering, Aswan University, Aswan, 81528, Egypt
author
M.
Nasrallah
Power Engineering and Machines Dep., Faculty of Eng, South Valley University, Qena, Egypt
author
text
article
2013
eng
Shunt active filter is used for suppression of current harmonics of nonlinear load to adjust total harmonics distortion (THD) of terminal voltage to the IEEE standards to improve the power quality. A specific control strategy which uses voltage detection of harmonic to reduce harmonics distortion in the waveforms of source current and terminal voltage resulting from distorted source and nonlinear load (together or separately) is applied. Moreover , the proposed control strategy is used to adjust the terminal voltage without effect on the other loads connected to the same common coupling point. This is used to reduce the voltage drop caused by current source by reducing harmonics on distribution power system to improve the power quality. The effectiveness and reliability of the specific control strategy used to control the shunt active filter has been verified by simulation results. In addition, theoretical analysis is presented to confirm the validity of the simulation results
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
558
576
https://jesaun.journals.ekb.eg/article_114749_0c782f6f1db797851a8ecaf85fe67400.pdf
dx.doi.org/10.21608/jesaun.2013.114749
HIGH LINEARITY CMOS VARIABLE GAIN AMPLIFIER FOR UWB APPLICATIONS
I. L.
Abdel-Hafez
Electronics and Communications Dept., Faculty of Engineering, Zagazig University, Zagazig. Egypt
author
Y. A.
Khalaf
Electronics and Communications Dept., Faculty of Engineering, Zagazig University, Zagazig. Egypt
author
Fathi A.
Farag
Electronics and Communications Department, Faculty of Eng.,Zagazig University, Zagazig. Egypt.
author
text
article
2013
eng
A large dynamic-range Variable Gain Amplifier (VGA) suitable for Ultra Wide Band (UWB) applications is presented. The VGA is composed of three programmable variable gain amplifier stages followed by an output buffer. Such wide bandwidth allows our proposed VGA to be used in multi-standard protocols. Power reduction is developed for the variable gain amplifier stages. Thorough analyses of the mid-band gain and noise are presented; and design tradeoffs are carefully handled. The VGA circuit is designed and simulated in 0.13 μm IBM-CMOS process; the overall VGA with buffer consumes 25 mA from a 1.5 V supply. The VGA achieves 54.5 dB dynamic-range (DR), 17.6 dBm IIP3, -42.31 dB THD at peak-to-peak differential output voltage of 1 V, and frequency 400 MHz. Moreover; the proposed circuit reports a good noise performance; the average integrated noise is 121.6 nV/Hz at minimum gain of -0.5 dB.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
577
591
https://jesaun.journals.ekb.eg/article_114750_a4e28d5cf26c125d4bb27b7a3fe97917.pdf
dx.doi.org/10.21608/jesaun.2013.114750
EFFICIENCY OPTIMIZATION WITH PI GAINS ADAPTATION OF FIELD ORIENTED CONTROL APPLIED ON FIVE PHASE INDUCTION MOTOR USING GA AND PSO
M. Mahmoud
Ismail
Electrical Power and Machine Department, Faculty of Engineering Helwan University
author
text
article
2013
eng
Improving of field oriented control (FOC) drives performance is studied for five phase saturated model induction motor as an example of multi phase machines which is now preferable than the conventional three phase motors . Genetic algorithm (GA) and Particle swarm optimization (PSO) are used for this purpose. Optimum flux reference identification by using GA and PSO are used to minimize the motor input power to have the optimum motor efficiency. Selecting the optimal gains using both methods are done to improve the motor response and behavior. A comparison between the simulation results was done to evaluate the performance for the developed controller adopting (GA) and (PSO) algorithms. The results show that, the proposed PSO controller algorithm has better optimization performance more than the proposed GA in both gain tuning and also in the selection flux set point.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
592
616
https://jesaun.journals.ekb.eg/article_114751_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/jesaun.2013.114751
PROCEDURES FOR MAINTENANCE OF EDUCATIONAL BUILDINGS "THE KINGDOM AND THE UNITED ARAB REPUBLIC OF EGYPT - COMPARATIVE STUDY"
Hesham Osman
Abd El Rahman
Tutor Department of Architecture, Faculty of Engineering, Al Azher University, Qena.
author
Mohamed Abd-Elsamee
Eid
Professor of Architecture Faculty of Engineering, ,& Vice President of Assiut University.
author
Nady Mostafa
Abd-Elkarim
Associate prof. in Architecture Department, Faculty of Engineering, Assiut University
author
text
article
2013
eng
Buildings and public facilities, especially in developing countries are considered national wealth which are necessary to preserve and maintain, not only for their cultural or functional value, but also they represent, wealth which is difficult to compensate with less financial resources and even non-existent in some cases. So their maintenance is important to maintain this wealth, extend the life of these buildings and develop them to be suitable for changing needs and requirements. Neglecting this maintenance leads to degradation, and may cause their demolition and removal to insure, the lives of their occupants in most cases when the treatment is difficult and impossible .Maintenance is considered as the third component after the basic design and implementation for any building. This maintenance is the conservative element of the building with the passage of time throughout its life. The educational buildings are considered one of the buildings which represent a major national treasure so they must be maintained long periods of time in good condition to play its educational role in the most perfect and safest manner. The research aims to highlight the procedures of maintaining educational buildings by reviewing and comparing between one of the most important systems of developed countries in the process of maintenance of buildings and the maintenance system of educational buildings in Egypt, through the review of legislation, administration and the stages of maintenance of educational buildings, and identifying similarities and differences in the performance of the two systems. To achieve the objective of this research and through the analytical method, this search begins by giving a theoretical background of the main definitions and basic concepts for the maintenance of buildings, followed by studying the procedures of maintaining the educational buildings in both of the United Kingdom and Egypt, and finally extracting the most important positives and negatives through this study, in an attempt to give a clear view of measures to increase the effectiveness of the maintenance procedures of the educational buildings in Egypt. And finally the paper provides a number of results and recommendations to improve the procedures of maintaining the educational buildings.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
617
644
https://jesaun.journals.ekb.eg/article_114752_ffefbc9741f634ad9022be117d42819c.pdf
dx.doi.org/10.21608/jesaun.2013.114752
THE EFFECT OF MODERN TECHNIQUES ON DEVELOPIING MUSEUMS IN EGYPT
Hesham M. M.
Hussein
Lecturer in the Architecture Department Faculty of Fine Arts – al Menya University
author
Essam
Mousa
Architectural consultant engineer
author
text
article
2013
eng
Modern techniques have actually affected the way individuals spend their leisure time. Museums will undoubtedly implement the aforesaid purpose to facilitate the public information. In the present century modern techniques help many individuals for the participation in museum public and social fields. Therefore, this thesis, through implementing the historical method, studies the history of museums through their conceptions and relevant relations in the past, the present, and the future, using a historical analysis for European and Arabic museum movements and their relation with the cultural and educational movement and their effect through the theoretical methodology using an analytical study for the technical development in museums. Through the field study for a group of redeveloped museums in Egypt and through questioning groups of professors and faculty members, consulting offices specialized in the field and specialists in the field of museums. A comprehensive methodology for developing museums in Egypt has been proposed through using modern techniques perspective represented in green museums, smart museums, and virtual museums to realize the optimum benefit.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
645
664
https://jesaun.journals.ekb.eg/article_114753_d4ed407a1f6d5d86029af6b8cbeb856a.pdf
dx.doi.org/10.21608/jesaun.2013.114753
ALTERATIONS IN RESIDENTIAL BUILDINGS FACADES AS AN INDICATOR OF THE DESIGN SUITABILITY
Ezzat Abd El-Moniem
Morghany
Associate Professor, Department of Architecture& Building Science, College of Architecture & Planning, King Saud University
author
text
article
2013
eng
The problem of incompatibility in the architectural design of some houses with the requirement of their residents is considered to be one of the residential areas problems, the alteration in the facades can be seen as an aspect of the user trials to reconcile architectural design of his house with his actual needs, Which makes the façade loses its original design and tern into a group of small facades, each reflects its user's preferences without any relation with the whole façade. The aim of the paper is to study the possibility of dealing with alterations in the buildings facades as an indicator to measure the design suitability. The paper discusses the concept of design suitability and deferent approach of designing the residential buildings facades in its first and second parts, In the third part of the paper, the alterations in the residential buildings facades is classified into two types, the first one is unintentional, but it is an aspect of the user's trail to meet the missed functional needs in the original design of his house, while the second type is the intentional alterations for either the seek of the individual identity or aesthetic reason from the user's point of view. The low income housing projects with their replica units and monotonous facades is the ideal environment for the second type of buildings facades alterations, in the last part; possibilities of take advantage of studying the alterations in the residential buildings facades is discussed. The paper concludes that Alterations in the buildings facades can be considered as an indicator to measure the design suitability (functional or incorporeal), but designers can not take advantage of them specifically in the architectural design of the future residential projects. In the end; the paper presents some recommendations which can be useful in dealing with the problem of alterations in the buildings facades in the new designs of the mass-produced housing projects.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
665
678
https://jesaun.journals.ekb.eg/article_114754_68bd9831b6d0ef1b94054bddd063ab7c.pdf
dx.doi.org/10.21608/jesaun.2013.114754
BUILDING MATERIALS SELECTION FOR SUSTAINABILITY IN ARCHITECTURE IN DEVELOPING COUNTRIES - CRITERIA AND TOOLS
Fatma Othman Mohamed
Othman
Lecturer, Department of Architecture Faculty of Engineering - Sohag University
author
text
article
2013
eng
Building materials are selected according to their characteristics and properties, which include the mechanical properties and functional, aesthetic and durability, and economic aspects, this paper aims to add sustainability criteria to these considerations strongly , to protect environment and the future of human life on earth. To achieve this goal , environmental criteria to selection of building have been studied , then the researcher make a survey of developments modern building materials for sustainability, then a study of available tools that can assist the architect to select building materials and comprise between the available alternatives has been studied . In this paper, tools presently available for the selection of building materials are overviewed and discussed, they include four tools , Environmental assessment methods , materials eco-labeling , materials Technical datasheets , Environmental Product Declarations.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
679
700
https://jesaun.journals.ekb.eg/article_114755_4f85d4b33543c14693dce012a51dadfb.pdf
dx.doi.org/10.21608/jesaun.2013.114755
A STUDY OF THE PERFORMANCE AND CHARACTERIZATIONS OF CLEANUP FLUIDS FOR RESERVOIRS DRILLED BY USING OIL-BASED MUD
Ali Elsaeh
Enbaia
Petroleum Engineering Department, School of Engineering and Sciences, Curtin University. CDT 250, 98009, Miri, Sarawak, Malaysia
author
Salah Musa
Algarmadi
Geology Department, Faculty of Sciences, Liverpool University, Liverpool, United Kingdom
author
text
article
2013
eng
The correct selection of the reservoir drilling fluid is critical to achieve the ultimate aim of minimizing formation damage for the completed such wellbores. This study evaluates the performance of a standard Oil Based Mud (OBM) to drill horizontal wellbores, concentrating on its formation damage characteristics and the Flow Initiation Pressures (FIP) required for production to flow through the filter-cake. For heterogeneous reservoirs, the study shows that in low permeability rocks the damage is relatively low but the FIP is high. Conversely, for high permeability rocks the FIP is low but formation damage is relatively high. If the drawdown pressure available from the reservoir is low, then we have the scenario where inflow will occur predominantly from the higher permeability formations which could be badly damaged but little inflow will occur from the relatively undamaged lower permeability rocks. In terms of maximizing production, this is obviously a less than optimal scenario. With this in mind, evaluations were conducted of cleanup fluids to gauge their effect on lowering the FIP of the OBM filter-cake. Various fluids were screened for their mud removal performance which would potentially indicate good OBM ‘chemical breakers’. Mud parameters such as oil: water ratio, base oil type and emulsifier content all affected the efficiency of the cleanup fluids. The best cleanup fluids were then utilized in a series of core tests to evaluate their effectiveness in reducing the filter-cake FIP.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
702
723
https://jesaun.journals.ekb.eg/article_114756_557d3c4b575622232f547efedce3b168.pdf
dx.doi.org/10.21608/jesaun.2013.114756
USING DIAMOND CORE BIT TO DETERMINE THE SUITABLE OPERATING PARAMETERS IN DRILLING SOME MARBLE ROCKS
Mostafa M.
Elbeblawi
Mining & Metal. Eng. Dept., Faculty of Engineering, Assiut University
author
Mohamed A.
Sayed
Mining & Metal. Eng. Dept., Faculty of Engineering, Assiut University
author
Gamal Y.
Boghdadi
Mining & Metal. Eng. Dept., Faculty of Engineering, Assiut University
author
Helal H.
Hamd_Allh
Mining & petroleum Eng. Dept., Faculty of Engineering, Al-azhar University, Quena
author
text
article
2013
eng
In this study four marble rocks were drilled by diamond core bit using a fixed laboratory-drilling machine at 400 and 1200 rpm, rotational speed, and over a range of weights on bit (WOB) 45, 60, 75, 90, … 225 Kg. Operating parameters of the drill bit such as WOB, penetration rate (PR), torque (T) and drilling specific energy (SE) were continuously monitored during the drilling trials. The effects of these parameters on the penetration rate were examined, and the effects of formation properties on the drilling rate were examined. Relationships between WOB and both PR, torque T and SE were described and the relationship between PR and SE was determined. Graphs are presented which can be used to predict diamond-drilling performance easy and fast.
JES. Journal of Engineering Sciences
Assiut University, Faculty of Engineering
1687-0530
41
v.
No 2
no.
2013
723
745
https://jesaun.journals.ekb.eg/article_114757_d6ece5acf6099030a5c3991d48196ab7.pdf
dx.doi.org/10.21608/jesaun.2013.114757