ORIGINAL_ARTICLE
THEORITICAL AND EXPERIMENTAL STUDY FOR THE BEHAVIOR OF SHORT COMPOSITE COLUMNS TESTED UNDER STATIC CENTRIC OR ECCENTRIC LOADS
Steel concrete composite structures are widely used in many structural applications such as beams, slabs, walls and columns. Composite structures provide not only great reduction for the element size and weight but also high structural efficiency. Because of the little data and disagreement between the R.C. and steel Egyptian Codes of Practice, an experimental and theoretical investigation were conducted to study the behavior of concrete filled steel box columns. The experimental program consists of six square filled steel box columns and two square R.C. columns (reference elements). The experimental variables are the load position (centric or eccentric) and the distribution of the mechanical shear connectors (nails). Test results are presented and discussed in comparison with the estimated values predicated from the Egyptian R.C. and steel codes of practice as well as the values obtained from the finite element program (ANSYS 12).
https://jesaun.journals.ekb.eg/article_113528_fc6523cbb97e7b53296fb3d4aa520954.pdf
2012-05-01
639
655
10.21608/jesaun.2012.113528
composite columns
Steel plates
centric load
eccentric load
shear connectors
L.M.
Hafez
1
Prof. Civil Eng. Dept., Minia University, Minia, Egypt.
AUTHOR
Y.R.
Tawfic
yasser_rifat@yahoo.com
2
Lecture. Civil Eng. Dept., Minia University, Minia, Egypt
AUTHOR
A.B.
Sdeek
amr_bakr2003@yahoo.com
3
Lecture. Civil Eng. Dept., Bni Sweef University, Bni Sweef, Egypt
AUTHOR
M.
Abdelazeem
pyram2050@yahoo.com
4
Demonstrator, Civil Eng. Dept., High Engineering & Technological institute, Minia, Egypt
AUTHOR
ORIGINAL_ARTICLE
JET STILLING BASIN
A stilling basin is designed to dissipate the kinetic energy of the flow in a hydraulic jump. Sometimes an abrupt rise is introduced based on land topography and design requirements to increase the energy dissipation and to reduce the length of the jump. The main objective of the present study is to use the abrupt rise in a radial stilling basin at certain positions to create a jet flow. Experiments were conducted to investigate the effect of the relative position and relative depth of the rise on the characteristics of the jet. The results of experiments are compared with the free hydraulic jump in a radial basin of flat horizontal bed. The dimensional analysis was used to correlate the jet characteristics to the other relevant flow and rise parameters. Also Theoretical models are developed for the prediction of the relative depth and the relative energy loss of the jet. It is found that in comparison with the case of free jump in flat bed the values of the relative depth and relative energy loss are higher and the percentage of increase decrease with the increase of the rise position to the gate. It is found also that the values of relative length are lower comparing to the free jump and the percentage of decrease decreases with the increase of the rise position to the gate.
https://jesaun.journals.ekb.eg/article_114401_42010efb3f628929cc314416ec212b26.pdf
2012-05-01
657
672
10.21608/jesaun.2012.114401
Radial stilling Basin
Hydraulic jet
Energy dissipation and Abrupt rise
Amany A.
Habib
amanyhabib89@yahoo.com
1
Lecturer, Dept. of Water & Water Structures Engineering, Faculty of Engineering, Zagazig University, Zagazig, Egypt
AUTHOR
ORIGINAL_ARTICLE
NONLINEAR ANALYSIS OF OFFSHORE STRUCTURES UNDER WAVE LOADINGS
The structural design requirements of an offshore platform subjected wave induced forces and moments in the jacket can play a major role in the design of the offshore structures. For an economic and reliable design; good estimation of wave loadings are essential. A nonlinear response analysis of a fixed offshore platform under wave loading is presented, the structure is discretized using the finite element method, wave force is determined according to linearized Morison equation. Hydrodynamic loading on horizontal and vertical tubular members and the dynamic response of fixed offshore structure together with the distribution of displacement, axial force and bending moment along the leg are investigated for regular and extreme conditions, where the structure should keep production capability in conditions of the one year return period wave and must be able to survive the 100 year return period storm conditions. The result of the study shows that the nonlinear response investigation is quite crucial for safe design and operation of offshore platform.
https://jesaun.journals.ekb.eg/article_114403_84ff83fb1a8397ed172ebb1741a557a8.pdf
2012-05-01
673
687
10.21608/jesaun.2012.114403
Offshore Structures
Sea waves
Nonlinear Analysis
Finite Element Analysis
Wave-Structure Interaction
Shehata E.
Abdel Raheem
shehataraheem@yahoo.com
1
Assoc. Prof. of Earthquake, Structural and Geotechnical Engineering, Taibah University, KSA. On leave; Faculty of Engineering, Assiut University
AUTHOR
Elsayed M. A.
Abdel Aal
2
Senior Off-Shore Structural Engineer, Egypt Gas Company.
AUTHOR
Aly G. A.
Abdel Shafy
3
Prof. of Structural Engineering, Civil Engineering, Faculty of Engineering, Assiut University.
AUTHOR
Fayez K.
Abdel Seed
4
Prof. of Structural Engineering, Civil Engineering, Faculty of Engineering, Assiut University.
AUTHOR
ORIGINAL_ARTICLE
DESIGN AND CONSTRUCTION OF MULTITIER SHORING TOWERS
The construction of heavy and high concrete slabs is considered as a great problem in projects because they need very efficient formwork systems. The multi-tiers shoring towers (as vertical supporting members ) appears as the common solution for this problem in addition to plywood sheathing, steel, wood ,aluminum as joists, stringers as secondary and main beams . The multi-tiers shoring towers are made of painted steel, galvanized steel or aluminum, they are modular, can be used a large number of time, much faster to erect and have high loading capacity. According to increase in demand for this type, the reason to study them is extremely needed. This paper determines the minimum weight of slab formwork using this system. The genetic algorithm is used as an optimization technique. An example is provided to illustrate the design procedure. The design procedure is shown through a computer model called OSAF.
https://jesaun.journals.ekb.eg/article_114404_459cf9b010e081260b83dff7e74e0fe6.pdf
2012-05-01
689
700
10.21608/jesaun.2012.114404
Formwork
Optimization
multitier
K.M.
Shawki
1
Associate prof., College of Eng. and Technology, AASTMT, Alexandria, Egypt.
AUTHOR
M.A.
Emam
2
Professor, College of Eng. and Technology, AASTMT, Cairo, Egypt
AUTHOR
El-B.
Osman
3
M.Sc. College of Eng. and Technology, AASTMT, Alexandria, Egypt
AUTHOR
ORIGINAL_ARTICLE
PARAMETRIC STUDY ON THE EFFECT OF MASONRY INFILL WALLS ON THE SEISMIC RESISTANCE OF RC BUILDINGS
The seismic resistances of RC buildings with masonry infill (MI) walls confined by Reinforced concrete (RC) frames are affected by the crucial role, either positive or negative, played by these walls. In this study, a nonlinear numerical investigation on the lateral behavior of masonry infilled RC buildings is carried out. Variety of parameters for both MI walls and buildings are considered. Different configurations of MI walls, size of wall openings, absence of MI walls in the first storey and MI wall thickness are investigated. The application buildings are either moment resisting frames (MRF) or dual shear wall-moment resisting frames (SW-MRF) buildings. The MRF buildings have 6 floors, while the SW-MRF buildings have 5 different heights represented by the number of floors (from six to twenty floors). Equivalent strut methodology is used and modified to model the behavior of infill walls taking into consideration the effect of opening sizes. Nonlinear static push-over analysis is carried out for the applied case study buildings. It is found that MI walls can highly increase the base shear capacity of either building types while significantly reduce the displacement capacity of MRF buildings, RC shear walls can resist this negative effect. The existence of soft first storey can drastically alter the lateral response of buildings. The influence of MI walls fades as the building height increases. The new distribution of failure mechanism is introduced.
https://jesaun.journals.ekb.eg/article_114405_6f208c047abc97bdc91f387f438f1c1a.pdf
2012-05-01
701
721
10.21608/jesaun.2012.114405
masonry infill walls push-over analysis
wall openings
soft storey
seismic codes
Waleed Abo El-Wafa
Mohamed
1
Associate Professor, Civil Engineering Department, Engineering College, Taif University, KSA. Permanent position: Assiut University, Assiut, Egypt.
AUTHOR
ORIGINAL_ARTICLE
EXPERIMENTS AND CALCULATIONS OF THE ROOM TEMPERATURE AFFECTED BY A DIRECT EVAPORATIVE COOLER DURING HOT AND DRY CLIMATE
Direct evaporative coolers are widely used in very hot and dry climate such as Aswan city. The accepted reduction of temperature and the value of relative humidity inside the buildings is an interesting topic. Experiments were made to measure the reduction of the room temperature due to the cooled air exiting from a direct evaporative cooler. All experiments are made during an ambient relative humidity less than 20% and the room was maintained at the same volume and heat load. The instant room temperatures were measured during the time until the steady state at different flow rates of cooled air and different very hot ambient temperatures. The experimental results were used to determine an empirical equation capable to predict the reduction of the room temperature at different ambient temperatures during very dry climate.
https://jesaun.journals.ekb.eg/article_114406_cf09aebbdf633cc8d636029b0f4e027b.pdf
2012-05-01
723
730
10.21608/jesaun.2012.114406
Hot and Dry climate
Evaporative system
Air cooler
Experimentation
Calculation
Waleed A.
Abdel-Fadeel
1
Assistant Professor, Department of Mechanical Engineering, Aswan Faculty of Energy Engineering, South Valley University, Egypt
AUTHOR
Soubhi A.
Hassanein
soubhi_a@yahoo.com
2
Assistant Professor, Department of Mechanical Engineering, Aswan Faculty of Energy Engineering, South Valley University, Egypt
LEAD_AUTHOR
ORIGINAL_ARTICLE
HEAT TRANSFER CHARACTERISTICS IN A DOUBLE-PIPE HEAT EXCHANGER EQUIPPED WITH COILED CIRCULAR WIRES
The effects of insulating wires (acting as turbulators only), with circular cross section of 2mm diameter, forming a coil of different pitches on the heat transfer rates are experimentally investigated. The investigation is performed for turbulent water stream in a double-pipe heat exchanger for both parallel and counter flows (for comparison) with cold water in the shell side. The experiments are performed for flows with Reynolds numbers ranging from 4,000 to 14,000. Three different spring coiled wire pitch values are used. The experimental results reveal that the use of coiled circular wire turbulators leads to a considerable increase in heat transfer over those of a smooth wall tube. The mean Nusselt number increases with the rise of Reynolds number and the increasing of pitch for both parallel and counter flows. The convective heat transfer coefficient for the turbulent flow was found to increase with turbulators for all coiled wire pitch values with the highest enhancement of about 450% for the counter flow while it was 400% for the parallel one. Correlations for mean relative Nusselt numbers and coiled wire pitch are provided.
https://jesaun.journals.ekb.eg/article_114407_e5579e83ced5a00e8d2fb9173d41e5b5.pdf
2012-05-01
731
744
10.21608/jesaun.2012.114407
heat transfer enhancement
Coiled wire
Turbulators
turbulent pipe flow
heat exchanger
A. E.
Zohir
alaa_sadegh@yahoo.com
1
Mechanical Engineering Department, Tabbin Institute for Metallurgical Studies, Cairo, Egypt,
AUTHOR
M.A.
Habib
mahabib@kfupm.edu.sa
2
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
AUTHOR
ORIGINAL_ARTICLE
THE DECEMBER 2010 HOUSEHOLD ENERGY SURVEY IN JORDAN
The household sector accounts for 20.9% of primary energy use in Jordan. Increase in energy-based living standards and more efficient energy use are major opposing trends in Jordan that affect household energy consumption. Governmental policies to influence household energy consumption are often contradictory and have brought mixed results. Ministry Of Energy has completed two cycles of surveys for household energy in the years 2001, 2004; on the other hand. The December 2010 update survey has been carried out in Mutah University and it is the latest update for those previous surveys, the result and conclusions of which are presented in this paper. Wood, LPG, electric heater and Kerosene are used extensively in most of the households. While the percentage of the households using solar water-heaters was 11%. The energy policy analysis reveals the need for government intervention to promote solar water-heaters as well as regarding the unsatisfied heating demand.
https://jesaun.journals.ekb.eg/article_114408_53386cc3833fdb5b2a0ad0b50e8c9b28.pdf
2012-05-01
745
764
10.21608/jesaun.2012.114408
Jordan
Domestic energy sector
wood, LPG, electric heater, solar collector
Mohammed Awwad
Al-Dabbas
madabbas@mutah.edu.jo
1
Department of Mechanical Engineering, Faculty of Engineering, Mutah University, Mutah, Al-Karak 61710 Jordan madabbas@yahoo.com
AUTHOR
ORIGINAL_ARTICLE
A PRECISE ANALYSIS AND VISUALIZATION OF PWM INVERTERS OUTPUT VOLTAGE THD USING COMPUTER ALGEBRA
In this paper a comprehensive study of THD of PWM inverters output voltage is illustrated by advanced technique using computer algebra systems. First, the target function is explained using mathematical analytical methods, and then these very complex equations are simplified by manipulating trigonometric identities and mathematical formulas. By using CAS (Computer Algebra System) MATHEMATICA - which is one of the most popular and powerful software - its symbolical and numerical manipulation capabilities to calculate the exact THD and produce it in a simple and fast convergent formula is presented. Second, a simulation package is established using MATHEMATICA to visualize output voltage THD. Finally, this package is utilized to analyze the effect of changing carrier duty cycle on output voltage THD of SPWM inverters. In addition a comparison study with [18] is presented, consequently a result that the work in [18] is fake.
https://jesaun.journals.ekb.eg/article_114409_4a2eee4d36533f39b36594df3a6bc6fd.pdf
2012-05-01
765
780
10.21608/jesaun.2012.114409
Total Harmonic Distortion (THD)
PWM inverters
Computer Algebra
Mathematica
Hossam
Hefnawy
hosamhe@yahoo.com
1
Computer and systems Eng. Dept., Faculty of Engineering, El Minia University
AUTHOR
M.
Moness
2
Computer and systems Eng. Dept., Faculty of Engineering, El Minia University
AUTHOR
El-Sayed
Mohamed
3
Computer and systems Eng. Dept., Faculty of Engineering, El Minia University
AUTHOR
ORIGINAL_ARTICLE
MODELING AND SIMULATION OF FUZZY PID CONTROLLERS FOR A SUBMERGED ARC FERROSILICON FURNACE
This paper investigates the control strategy for the electrical energy input to three phase electric arc ferrosilicon furnace. The classical PD fuzzy logic controller has two inputs. These inputs are the error in the V-I characteristic and the rate of the error in V-I characteristic. When the simulation result of this controller is compared with conventional PD type, it was shown that requires steady state accuracy. This paper is concerned with incorporating the integral property to the classic fuzzy PD controller. The result is a nonlinear fuzzy PID controller eliminates the steady state error resulted from the classic fuzzy PD actions. In this paper, the submerged arc ferrosilicon furnace is described by the heat transfer system, the electrical system equipments and the dynamics from the electrode positions to the electrode currents. The proposed control design methodology is tested on the model of submerged arc ferrosilicon furnace FeSi via simulation. The simulation work is carried out using simple environment via computer program written using C++ language. The obtained results guarantee the potential of the proposed control methodology to add self autonomy to the system behavior.
https://jesaun.journals.ekb.eg/article_114410_662256ea8f54da63ccf61df06bada545.pdf
2012-05-01
781
797
10.21608/jesaun.2012.114410
Arc resistances
Electrodes
Fuzzy logic control
Industrial process, Model
PID Controllers
G.
Shabib
gabershabib@yahoo.com
1
Faculty of Energy Engineering, South Valley University, Aswan, 81528, Egypt
AUTHOR
ORIGINAL_ARTICLE
ENHANCING PERFORMANCE OF HIGH VOLTAGE METALLIZED FILM CAPACITORS BY USING NEW INDUSTRIAL NANO-COMPOSITES
This paper explains the enhancement on the performance of conventional High voltage metalized film capacitor doped with the Nanoparticles; the studied model has been discussed how the characteristics of High voltage metalized film capacitor has been enhanced depending on the concentration of the doped Nanoparticles and also their electric and dielectric properties. Also, this research investigates novel Nano-metric industrial materials for enhancing the electrical performance of multi section metalized film capacitors which satisfy a large variety of ac applications, electronic applications, and optimizing the characteristics of metalized film capacitors for specific applications by selecting suitable nanocomposite materials. Adding nanofillers to the conventional materials of multi section metalized film capacitors has enhanced the dielectric constant, dielectric strength, self-healing properties, temperature stability and volumetric efficiency that allowing achieving the highest capacitance per unit volume for this type of capacitors. Theoretical results have been investigated for comparing with conventional structure materials and new nanocomposite industrial materials of multi section metalized film capacitor. Finally, the present contribution has computed equivalent series inductance (ESI), equivalent series resistance (ESR), volumetric energy density, peak discharge current …etc. for multi section, high voltage windings, including limitations caused by various new nanocomposite materials.
https://jesaun.journals.ekb.eg/article_114411_87a49487f6846e9995dcc208f68d1a43.pdf
2012-05-01
799
818
10.21608/jesaun.2012.114411
ESI
ESR
volumetric energy density
nano-composite
Nanoparticles
Capacitors
A.
Thabet
1
Nano-Technology Research Centre, Faculty of Energy Engineering, South Valley University, Aswan, Egypt
AUTHOR
ORIGINAL_ARTICLE
REGION-BASED IMAGE RETRIEVAL WITH RELEVANCE FEEDBACK
Region-based image retrieval (RBIR), a special type of content based image retrieval (CBIR), is an important research. This paper presents integration of RBIR with relevance feedback (RF) to enhance the performance of CBIR. Watershed algorithm is used to extract regions but not all regions are with the same importance. So, a region-weighting scheme reflecting the process of human visual perception is proposed. By using relevance feedback method, the matching process could improve retrieval performance interactively and allow progressive refinement of query results according to the user's feedback action.
https://jesaun.journals.ekb.eg/article_114412_e711562231222070f72d2dddc7d0ecb1.pdf
2012-05-01
819
832
10.21608/jesaun.2012.114412
Relevance feedback
Region-based image retrieval
Content-based image retrieval
Attention center
Integrated region matching
Watershed segmentation
Feature Extraction
A.
Hamdy
alaa_abdelkader@h-eng.helwan.edu.eg
1
Department of Communications, and Computers Engineering Faculty of Engineering, Helwan University Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
AUTONOMOUS PHOTOVOLTAIC LIGHTING SYSTEM
This paper introduces a comparison between the conventional and Photovoltaic (PV) lighting systems. A simple sizing procedure for a PV stand-alone system was advised. The paper also proposes a novel PV lighting system. The proposed system is simple, compact and reliable. The system operation was investigated by thoroughly mathematical and simulation work.
https://jesaun.journals.ekb.eg/article_114413_c6779e38a8599972e749391b97d5f38e.pdf
2012-05-01
833
847
10.21608/jesaun.2012.114413
Ahmed A. A.
Hafez
elhafez@aun.edu.eg
1
Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt, PO 71516
AUTHOR
Daniel
Montesions-Miracle
2
Centre d'Innovació Tecnològica en Convertidors Estàtics i Accionaments (CITCEA-UPC), Departament d'Enginyeria Elèctrica, Universitat Politècnica de Catalunya.ETS d'Enginyeria Industrial de Barcelona, Av. Diagonal, 647,Pl. 2. 08028 Barcelona, Spain
AUTHOR
Antoni
Sudria-Andreu
3
Centre d'Innovació Tecnològica en Convertidors Estàtics i Accionaments (CITCEA-UPC), Departament d'Enginyeria Elèctrica, Universitat Politècnica de Catalunya.ETS d'Enginyeria Industrial de Barcelona, Av. Diagonal, 647,Pl. 2. 08028 Barcelona, Spain
AUTHOR
ORIGINAL_ARTICLE
FAULT DURATION FOR VOLTAGE INSTABILITY AND VOLTAGE COLLAPSE INITIATION AS INFLUENCED BY GENERATOR VOLTAGE MAGNITUDES (GVM)
The occurrence of voltage instabilities or voltage collapses depend on the duration of the persistence of the fault and on the type of fault, some faults lead to voltage instabilities, others lead to voltage collapse. Evaluation of fault durations causing occurrence of voltage instabilities or collapse is the main goal of this paper. The effect of the generators terminal voltages magnitudes (GVM) on fault duration which causes voltage instability initiation is investigated. The fault which leads to voltage instability is found to be three-phase short-circuits at certain load bus and cleared without any variation in the transmission system elements, i.e. the post-fault network conditions will be the same as its pre-fault conditions. Also, this paper searches for the effect of GVM on fault duration for voltage collapse. Where, some line opening in the studied system can be lead to occur the phenomena of voltage collapse initiation.
https://jesaun.journals.ekb.eg/article_114414_c0355e01c0cc20d50d7d0ade46d8d6cb.pdf
2012-05-01
849
866
10.21608/jesaun.2012.114414
Voltage Instability
Voltage collapse
GVM
Youssef A.
Mobarak
1
Electrical Engineering Department, Faculty of Energy Engineering, South Valley University, Aswan, Egypt
AUTHOR
ORIGINAL_ARTICLE
ADAPTIVE SPECTRUM SENSING IN COGNITIVE RADIO NETWORKS
It is becoming increasingly evident that cognitive radio (CR) users in CR networks acting in uncertain dynamical environments often employ exact or approximate Bayesian statistical calculations in order to continuously estimate the channel states. In this work we propose a prediction/filtering channel state estimation model capable of exactly implementing Bayesian state estimation and prediction from input point process measurements in real time. This setup is ideally suited to real CR networks. The results suggest that our model is useful for improving the performance of the sensing mechanism in practical CR environment.
https://jesaun.journals.ekb.eg/article_114416_328139a49a81f2b566157c73c9c0063c.pdf
2012-05-01
867
875
10.21608/jesaun.2012.114416
Cognitive radio networks
Adaptive sensing
Channel activity estimation
Hypotheses testing
Gamal Abdel Fadeel
Mohammed
gam_hel@yahoo.com
1
Electronics, Communications and Computer Engineering Department, Faculty of Engineering, Helwan, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
FEEDFORWARD COMPENSATION TECHNIQUE FOR COMPARATOR DELAY DISPERSION FOR LEVEL-CROSSING ADCS
The accuracy of measuring the crossing moment of a given signal to a specific reference voltage plays a crucial role in determining the bandwidth of the signal that could be converted by a level-crossing ADC. This timing accuracy is mainly determined by delay dispersion of the comparator and the accuracy of the time-to-digital converter (TDC) comprising the level-crossing ADC. With the pico-second resolution TDC, the delay dispersion of the comparator became the bottle nick of the design of a high speed level-crossing ADC. This paper presents a comparator with low delay dispersion for level-crossing analog-to-digital conversion applications. The comparator comprises a technique to compensate the delay dispersion caused by variable input overdrive. The whole circuit is composed of three main blocks, namely, conventional comparator, fixed delay block and variable delay block. The variable delay block is controlled such that it implements the inverse overdrive-delay characteristics of the conventional comparator. Therefore, the overall delay dispersion of the circuit is effectively reduced. Using the proposed technique in a level-crossing ADC would enable the sampling of a signal with 6.15X higher frequency than the case of using a conventional comparator keeping the same SNR.
https://jesaun.journals.ekb.eg/article_114417_df16a0553d4edf4212e9ed6c58fd333e.pdf
2012-05-01
877
884
10.21608/jesaun.2012.114417
Mohamed
Abbas
m-abbas@aun.edu.eg
1
Department of Electrical & Electronics Eng., Faculty of Eng., Assiut University, Egypt
AUTHOR
ORIGINAL_ARTICLE
BULK ELECTRIC SYSTEM RELIABILITY EVALUATION WITH WIND TURBINE AND ENERGY STORAGE
This paper describes a new methodology for grid expansion planning considering the probabilistic reliability of a Bulk Electric Systems (BES) including Wind Turbine Generators (WTG) and Energy Storage System (ESS).The proposed model includes the main parameters used to create an operational history for each individual unit and transmission line unavailability. Bulk electric system reliability analysis associated with wind energy provides an opportunity to investigate the reliability benefits when large-scale wind power is injected in a BES. High wind power penetration can lead to high risk levels in the overall system reliability. The impacts of different wind turbine penetration levels on the reliability benefits from ESS are analyzed when the WTG capacity is utilized to replace the conventional generators with same total rated power capacity. The WTG and ESS capacity are installed to meet the annual growth of load demand and maintain the BES adequacy levels. The proposed method is applied to the IEEE Reliability Test System (IEEE– RTS ).
https://jesaun.journals.ekb.eg/article_114418_14266d4e3b231b1a9bed24796b744f13.pdf
2012-05-01
885
898
10.21608/jesaun.2012.114418
Bulk electric systems
Wind Turbine Generator
Energy Storage System
grid expansion planning
reliability evaluation
L. A.
TALAT
1
Ass. professor, Electric Power and Machines Department, Faculty of Engineering, Helwan University
AUTHOR
ORIGINAL_ARTICLE
FUZZY CONTROLLER DESIGN FOR DC MOTOR USING ANT COLONY OPTIMIZATION ALGORITHM
This paper presents fuzzy controller design using ant colony optimization algorithm (ACO-FC). The objective of ACO-FC is to improve the control performance and design ease of fuzzy controller. In ACO-FC, the antecedent part (IF part) of a fuzzy system is flexibly partitioned in grid type, and the consequent part (THEN part) of each rule is selected by the ants where the route of an ant is regarded as combination of consequent actions selected from every rule. Searching for the best one among all consequence combinations is based mainly on the pheromone matrix among all candidate actions. To verify the control performance of ACO-FC, simulations on position control of a DC motor are performed. Comparison with PID like fuzzy controller demonstrates the advantages of ACO-FC.
https://jesaun.journals.ekb.eg/article_114419_0d1cf4749a8ea13d039421b70477fee0.pdf
2012-05-01
899
911
10.21608/jesaun.2012.114419
Ant colony optimization (ACO)
fuzzy controller design
Position Control
Mohammad
El-Bardini
1
Faculty of Electronic Engineering, Menouf, 32852, Egypt
AUTHOR
Mohamed
Fkirin
2
Faculty of Electronic Engineering, Menouf, 32852, Egypt
AUTHOR
Sameh
Abd-Elhaleem
eng_sah55@yahoo.com
3
Faculty of Electronic Engineering, Menouf, 32852, Egypt
AUTHOR
ORIGINAL_ARTICLE
UTILIZATION OF LIMESTONE DUST IN BRICK MAKING
In Egypt, Large amounts of limestone dust are accumulated annually during running limestone quarries. Disposal of these wastes is a rapidly growing problem, and causes certain serious environmental problems and heath hazards. Therefore, research for utilizing these disposals is urgently needed. The main aim of this study is to investigate both physical and mechanical properties of brick specimens containing combinations of limestone dust and small amount of Portland cement as a binder for producing building brick material. Limestone dust and cement were mixed, humidified and molded by two methods, hand-making method and mechanical molding method applying small compaction action. After demoulding, the produced specimens were left to dry in air at room temperature for 28 days. The obtained values of water absorption, bulk density, slake durability index, and compressive strength satisfy the Egyptian standard of fired clay building units for non-load bearing walls. The test results indicate that brick specimens contain 13% cement satisfy the requirements of building of non-load bearing walls in Egypt. The process undertaken can easily be applied in the working Egyptian brick plants using semi mechanization system. The positive use of these wastes converts them into useful products that can alleviate the disposal and environmental problems.
https://jesaun.journals.ekb.eg/article_114423_6588947b6804baafcf1ad314b0d83e4e.pdf
2012-05-01
913
922
10.21608/jesaun.2012.114423
utilization of limestone wastes
Concrete mix
Environmental impact of limestone quarrying
Recycling of wastes
A.
A.Mageed
1
Assiut Univ., Faculty of Eng. Dept. of Mining & Metall., Assiut, Egypt
AUTHOR
Gamal .S.
AbdelHaffez
2
Assiut Univ., Faculty of Eng. Dept. of Mining & Metall., Assiut, Egypt On Secondment to king AbdulAziz Univ., Jeddah, Saudi Arabia
AUTHOR
ORIGINAL_ARTICLE
THE PROBLEM OF ARCHITECTURE & URBAN IDENTITY OF CAMPUS BUILDINGS IN NEW COMMUNITIES
New University Campus buildings, new urban communities is the center of cultural and civilizational radiation because of their scientific value, symbolic and factor interact with the identity and character of the place . It has become suffering from lack of respect for the identity of a local architectural, urban and cultural heritage of the place as a result of an extensive and varied intellectual, which occurred as the product of the stage of modernism and different orientations and self-views, both architects or owners of the universities and foreign institutes in a case dealing with the architectural identity. This study discusses the correlation between the urban and architectural identity of the campus buildings and space ,studying the different experiences, which has respected the identity and character of the place , Through the study and analysis of some examples in the local reality and the new urban communities in order to take advantage of the serious examples which respects the importance of architectural identity and the cultural heritage of the place , especially of university buildings when building in a society with a characteristic cultural, heritage and unique identity .
https://jesaun.journals.ekb.eg/article_114426_fad1a606c260646a969ff7e7cac9cdad.pdf
2012-05-01
923
941
10.21608/jesaun.2012.114426
Ehab nasr Elden Ahmed
mohamed
1
Department of Architecture, Faculty of Engineering, Mataria, Helwan University
AUTHOR
ORIGINAL_ARTICLE
ISLAMIC URBANISM AND ACCESS REGULATION AS A GUIDE TO THE FUTURE THE CASE OF MEDIEVAL CAIRO
In the present century, when not only building styles, but techniques and materials though out the Islamic world are increasingly drawn from alien understand what traditional Islamic society itself sees as significant in its architecture, Islamic settlements reveal a consistent underlying order of hierarchical sequences of access and enclosure responding to pattern of social intercourse and allegiance particular to Islamic society. In this paper we will investigate the domestic sphere in an Islamic context of Medieval Cairo, we will examine Cairene domestic architectural types and access regulation to see how the domestic spaces reflect and addressed include multi-house compound. Privacy and access regulation will be analyzed at four hierarchical levels of settlements within an urban setting; the courtyard house, the residential alley, the quarter and the city .The traditional Islamic city was composed of nested hierarchies of space, based on the primary unit of inward-looking courtyard house. Traditionally, the nested hierarchies were created the development of shari’a established tradition as a guide to the present. In this sense, we will turned to medieval documents, not to reconstruct the past, but to appropriate clear prescribed regulations that will rectify the estrangement caused by the careless intrusion of Western forms .
https://jesaun.journals.ekb.eg/article_114428_afc782458bf31cd5e13cbb217bf92438.pdf
2012-05-01
943
958
10.21608/jesaun.2012.114428
domestic architecture
access regulation
hierarchical levels
Islamic urbanism
Shari’a
Medieval Cairo
Tradition
Hanaa Mahmoud
Shokry
hanaashokry@hotmail.com
1
Associate professor –Department of Architecture- Faculty of Architecture &Design- Jazan University- Saudi Arabia
AUTHOR