Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301ANALYSIS OF BI-COLD FORMED STEEL CONCRETE COMPOSITE BEAMS36538010946210.21608/jesaun.2006.109462ENL. M. Abdel HafezCivil Engineering Department, Faculty of
Engineering, Minia University, Minia, EgyptJournal Article20060124<span>This paper presents the numerical study to simulate the behavior of cold-formed bi-steel-concrete beams using ANSYS program. The study was carried out on fifteen beams having six steel plate shapes of 10mm thickness tested experimentally by Ahmed [1]. The composite action between steel and concrete was insured using steel connectors in form of nails fixed through drilled holes in steel plate by means of epoxy. The main parameters considered in this analysis were the steel plate’s shape and the position of the connectors. Also this study was extended to study some parameters didn’t take into account experimentally such as the effect of concrete strength and nail diameter</span>Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301EFFECT OF ACCELERATED MOISTURE DAMAGE ON CREEP COMPLIANCE CHARACTERISTICS OF ASPHALT CONCRETE MIXTURES38139311040110.21608/jesaun.2006.110401ENAyman M. OthmanCivil Engineering Department, Aswan Faculty of Engineering, South Valley University, Aswan, EgyptHassan Y. AhmedCivil Engineering Department, Faculty of Engineering, Assiut University, Assiut,
EgyptJournal Article20060115– Major pavement deterioration can be attributed to the presence of water on the pavement surface. Within this framework, this research is focused on studying the impact of accelerated moisture conditioning on pavement deterioration. This study is based on laboratory evaluation of creep characteristics and mechanical properties of asphalt concrete mixtures. This evaluation can aid in assessing the longterm stripping susceptibility and permanent deformation potential of asphalt concrete mixtures. Cement dust was incorporated in the mixture as mineral filler and compared with traditional lime stone filler. Accelerated moisture damage program was established to evaluate the mixture resistance to moisture damage. Marshall specimens were immersed in a water bath under vacuum of 510 mm of mercury (Hg) for different moisture conditioning periods of 0, 1, 2 and 7 days. A power law model was used to characterize the creep compliance behavior of the studied mixtures. Creep testing results have revealed that the creep compliance power law parameters have a strong relationship with mixture type and moisture conditioning period. The creep resistance of the studied mixtures, as indicated by the creep compliance parameters, decreases as the moisture conditioning period increases. Results also revealed an enhancement in the creep resistance, Marshall stability, indirect tensile strength and compressive strength for mixtures containing cement dust as compared to mixtures with traditional lime stone filler.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301FLEXURAL BEHAVIOR OF LAPPED SPLICED HIGH STRENGTH R.C BEAMS SUBJECTED TO STATIC LOADING39541111046110.21608/jesaun.2006.110461ENEng. Hatem A. MahmoudExpert Engineer in Ministry of Justice, Aswan, EgyptYehia. A. HassaneanCivil Department, Faculty of Engineering, Assiut University, Egypt.Abdelrahman MegahidCivil Engineering Department, Faculty of Engineering, Assiut University,
Assiut, EgyptJournal Article20060125An experimental program was formulated to investigate the influence of some factors affected the overall flexural behaviour of high strength under reinforced concrete beams lapped at tension zone. Fourteen beams were made from high strength concrete and only one beam made from normal strength concrete. These beams were tested under two point static loading to study the flexural behaviour of high strength concrete beams reinforced with spliced tension bars. The effect of concrete compressive strength, lap splice length, transverse reinforcement at lap splice and the percentage of tension reinforcement ratio on its behaviour were considered. Also, the experimental results were compared with those predicted values based on the available well-known theoretical equations. The tests showed that the increase of concrete compressive strength, transverse reinforcement at lap splice regions and lap splice length considerably improve the flexural behaviour of high strength under reinforced concrete beams.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301MOMENT CAPACITY OF STEEL FIBER REINFORCED CONCRETE BEAMS41342211046210.21608/jesaun.2006.110462ENMuhammad I. M. RjoubDepartment of Civil Engineering, Faculty of Engineering Technology,
Marka P.O. Box 15008, Amman 11134 JordanJournal Article20051017Using discrete steel fibers in reinforced concrete improves some mechanical properties of concrete such as the tensile strength, shear strength, toughness and the flexural strength. In this research work, the effect of adding steel fibers on the moment capacity of steel fiber reinforced concrete (SFRC) is studied and new relationships accounting for the variations in the modulus of rupture resulted from the added steel fibers are presented. The relations are expressed in terms of the fiber content, fiber aspect ratio and the concrete compressive strength and then employed in predicting the moment capacity of SFRC beams. The applicability of the proposed formula in predicting the moment capacity of SFRC beams is checked by analyzing fifty-two beams of different fiber content, concrete strengths and densities ranging from normal to light-weight. The comparisons of the predictions agreed with the corresponding experimental values.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301AN INVESTIGATION OF SHALLOW WATER FLOW OVER PERMEABLE BED WITH REFERENCE TO SURFACE IRRIGATION42343911046510.21608/jesaun.2006.110465ENHassan IbrahimJournal Article20060116Surface irrigation is used more than pressurized irrigation due to low cost, more efficient energy requirements, and better aeration of the root zone. The design, evaluation and simulation of surface irrigation systems rely on a knowledge of the movement of the water over the field. However, hydraulics of surface irrigation flow is more complicated flow than the other open channel flow due to the shallowness and unsteadiness of water depth and existence of permeable bed. In application of the volume balance (VB) models, it is generally assumed that the average depth of surface water is constant. This basic assumption may cause significant errors in computing advance water. In this paper, a model is developed for computing the advance distance and/or time of propagation for both border and furrow irrigation. Where, the surface and subsurface flow profiles in the advance phase are assumed to be of parabolic shape and their coefficients are determined by conditions in the gradually varied flow region, rather than in the rapidly varied flow region near the advance front. The model is applied for both border and furrow irrigation. The results are satisfied via testing with the field data obtained from different regions and various soil types and situation of field surface.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301EFFECT OF SCRAP AND REWORK COST ON OPTIMUM PRODUCTION PROCESS MEAN VALUE44145111047110.21608/jesaun.2006.110471ENA. WazeerDepartment of Production Engineering, Industrial Education College, Beni-Suef, EgyptJournal Article20060102The costs due to producing a product below the lower specification and above the upper specification limit are not equal in the production process. Due to these different costs, the total cost incurred will greatly depend on the process mean value. This study shows how the optimum value of production process mean can be obtained when the quality characteristic follows normal and non-normal distributions. In this study, optimization models for determining the optimum values of production process mean under different cost criteria are presented. A numerical example and sensitivity analysis are performed for each quality characteristic distribution.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301BEHAVIOR OF WOVEN FABRIC REINFORCED EPOXY COMPOSITES UNDER BENDING AND COMPRESSIVE LOADS45346911047210.21608/jesaun.2006.110472ENM. Abdel GhafaarDesign and Production Engineering Department, Faculty of Engineering, Minia
University, Minia, EgyptA. A. MazenDesign and Production Engineering Department, Faculty of Engineering, Minia
University, Minia, EgyptN. A. El-MahallawyProduction Engineering Department, Faculty of Engineering, Ain Shams University,
Cairo, EgyptJournal Article20051016The mechanical behavior of epoxy reinforced by three different types of woven fibers was studied under compressive and bending loads. The reinforcements used were: woven glass fibers (volume fractions: 9.2%, 18.4%, 27.6%, and 36.8%), woven carbon fibers, and woven hybrid (carbon/glass) fibers at 36.8 vol.%, each. The composites were manufactured using the hand lay-up technique. Pure (unreinforced) epoxy specimens were tested as a reference material. The fracture behavior of the investigated specimens was studied both macroscopically, and using scanning electron microscopy (SEM). It was found that under compressive loads, elastic deformation is nonlinear for pure epoxy as well as epoxy reinforced by low volume fractions of glass woven fibers. At high volume fractions of glass fibers, carbon fibers, or hybrid ones, this non linearity diminished significantly. The modulus of elasticity of epoxy-reinforced by glass fibers (GF) continued to increase as a function of fiber volume fraction. At 9.2 vol.% the modulus of elasticity showed an increase of 65% compared to pure epoxy, while at 36.8 vol.% GF the improvement reached 117%. At the same volume fraction of 36.8% hybrid, and carbon reinforcements the improvements were 160%, and 178%, respectively. Similar trend of improvements were observed for the other mechanical properties under compressive loads. Under bending loads, both the flexure modulus, and flexure strength showed significant improvement as a function of glass fiber volume fraction. At the same reinforcement volume fraction, carbon fiber composites gave the highest mechanical properties, followed by hybrid composites, while glass fiber composites showed lowest improvement (about 348% improvement in flexure strength compared to pure epoxy). Fiber pull-out and debonding are the main fracture mechanisms for glass fiber reinforced epoxy, while interlaminar shearing is the main mechanism for carbon fiber composites. Hybrid (C/G) composites showed a mixed mode mechanism. The fracture process in bending proceeded in stages from the tension side inwards towards the compression side. Each stage is associated with a load drop and audible sound waves.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301INVESTIGATION OF THE TEMPERATURE EFFECT ON THE STEEL BALL WEAR LUBRICATED WITH ALIPHATIC ALCOHOLS AND THEIR TRIBOCHEMISTRY47147911047310.21608/jesaun.2006.110473ENMohamed Al-NoziliChemistry Department, Faculty of Science, Ibb University, YemenMufid ObadiUniversty of Hodeida, Faculty of Education , Department of Chemistry.
YemenJournal Article20060216─ In the present work influence of operating temperature on wear of the steel ball sliding on steel disk, lubricated with individual alcohols 1-decanol C10, 1-dodecanol C12 and equimolar mixtures of these alcohols was investigated. Minimum wear values for individual alcohols were found at the temperature of 80 0C however, at 40 0C for binary mixtures of these alcohols. FTIR surface analysis after friction process presents 1-decanol new absorption bands mostly in the region of 1522 – 1549 cm-1 which usually is combined with the absorption bands around 1653 – 1680 cm-1 were found in deposits formed on the steel substrates. They have been assigned to organometallic compounds including double bonding.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301ACID RAIN & THE HARM TO THE ENVIRONMENT48148511047410.21608/jesaun.2006.110474ENZohair Khalaf IsmailDepartment of Chemical Engineering; Faculty of Engineering Technology
Al-Balqa Applied University; Marka-Amman, Box: 15008, JordanSubhi K. Abderrezaq, Ph. D. REMCity University-Tricities, WA 99352 USAJournal Article20051231One of the by-products of everyday life is acid rain. While acid rain is composed of several different pollutants, the two main ones are sulfur dioxide (SOX) and nitrogen oxides (NOX). Acid rain may also arrive in several different ways. It may show up in the form of rain, mist, snow, fog, or dry gas. SOX are produced by coal-burning smelters, power plants, and factories. NOX are produced by burning fuels such as gasoline in the cars and oil in the homes. Electric utility plants generate approximately 70 percent of annual SOX emissions and 30 percent of NOX emissions in the United States. Mobile sources also contribute a large amount to NOX emissions. Damage caused by acid rain ranges from respiratory health problems in humans to acidification of bodies of water and the loss of species of fish, and also the damage to forests and the soil needed for the trees to grow. There have been several laws and regulations passed to try and control the levels of acid rain. The Clean Air Act Amendments of 1990, being the main one to be passed and put into use. Once an individual and \ or industry performs a cost benefit analysis the decision will be an effortless. Reduction of the pollutants that cause acid rain needs to be implemented.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301A NEW VERSION OF ELMAN NEURAL NETWORKS FOR DYNAMIC SYSTEMS MODELING AND CONTROL48750811046610.21608/jesaun.2006.110466ENDr. Hamdi A. AwadDepartment of Industrial Electronics and Control Engineering, Faculty
of Electronic Engineering, Menouf, 32952, Menoufia University, Egypt.Journal Article20051228Elman network is a class of recurrent neural networks used for function approximation. The main problem of this class is that its structure has a set of global sigmoid functions at its hidden layer. That means that if the operating conditions of a process be identified, are changed the function approximation property of the network is degraded. This paper introduces a new version of the Elman network named Elman Recurrent Wavelet Neural Network (ERWNN). It merges the multiresolution property of the wavelets and the learning capabilities of the Elman neural network to inherit the advantages of the two paradigms and to avoid their drawbacks. Stability and convergence property is proven for the proposed network. The paper also develops a model reference control scheme using the proposed ERWNN. The proposed scheme belongs to indirect adaptive control schemes. The dynamic back propagation (DBP) algorithm is employed to train both the two networks structured for the indirect control scheme. This paper derives also the plant sensitivity for adjusting the parameters of the developed controller. The advantages of this new version of ERWNN in modeling and controlling time intensive dynamic processes, are reflected in our simulation results.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301SIMULATING THE VOICE BLOCKING PROBABILITY, PACKET LOSS PROBABILITY AND PACKET DELAY FOR GSM/GPRS NETWORK50951711046710.21608/jesaun.2006.110467ENDr. Osama El GhandourElectronics & Communications and Computer Engineering
Department, Helwan University, Cairo, EgyptJournal Article20050918The field of wireless mobile networking has advanced greatly over the last decade. Different protocols and technologies are in place today to provide wireless and mobility communications in various environments. This paper uses an analytical approach for modeling the mobility effect as well as the data traffic load on the overall system performance in GSM General Packet Radio Service (GPRS) network. An integrated voice/data wireless system with finite buffer for data traffic has been considered as in [1] and based on decomposition of system behavior into short-term and long-term behavior techniques that were introduced in [2]. We used a simplified analytical model to study some performance keys that enable us to evaluate the overall performance in GPRS network and to study how the data services affect the main performance of the GSM network and what is the limit of offered load intensity and mobility that can not be exceeded in order to get an accepted system performance.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301A NEW VOLTAGE COLLAPSE PROXIMITY INDICATOR51953811046810.21608/jesaun.2006.110468ENDr. Gamal Abdelazim MahmoudElectrical Engineering Department, Faculty of Engineering , Suez Canal University, Port Said, EgyptJournal Article20060121Voltage stability problems have been one of the major concerns for electric utilities as a result of increase demanding of electric power. This paper develops a new voltage collapse proximity indicator using catastrophe theory together with comparative singularity of power flow Jacobian and modal analysis. The application of the proposed indicator has been demonstrated on multimachine power systemsAssiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301STABILITY ANALYSIS FOR GENERALIZED PREDICTIVE CONTROL (GPC) WITH UNCERTAIN SYSTEMS53955511046910.21608/jesaun.2006.110469ENHesham W. Gomma, MIEEEElectronics, Communication and Computer Engineering Department,
Helwan University, EgyptJournal Article20060115This paper presents stability analysis for the well known generalized predictive control (GPC) when dealing with uncertain systems. This analysis is based on the step response coefficients and its explicit relation with the system transfer function. It reveals a part of the mystery behind the stability strength of the GPC.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301MULTIVARIABLE DYNAMIC SYSTEMS MODELING AND CONTROL USING A NEW PARTICLE SWARM ALGORITHM-LOCAL MODEL NETWORK55757611047010.21608/jesaun.2006.110470ENNabila M. El-RabaieFaculty of Electronic Engineering, Menouf, 32952, EgyptTarek A. MahmoudFaculty of Electronic Engineering, Menouf, 32952, EgyptJournal Article20051228- This paper introduces the Particle Swarm Algorithm (PSA)-based Local Model network (LMN) for modeling and controlling dynamic systems. Structurally, the proposed PSA-LMN merges the fuzzy set theory and wavelets in a unified form. Learning this network comprises two phases, structure learning phase and parameters learning phase. The former is performed using the Adaptive Resonance Theory (ART) algorithm while the latter is performed using the PSA. The PSA is employed to optimize parameters of the fuzzy sets, the wavelets and the free weights of the proposed LMN. Two simulation nonlinear plants are used to test the soundness of the proposed network; one is a single input single output nonlinear plant and the other is multi-variable medical plant. The latter is employed to test the proposed network in control purposes compared with Genetic Algorithm (GA)-based LMN. Better results were obtained using the proposed PSA-based LMN.Assiut University, Faculty of EngineeringJES. Journal of Engineering Sciences1687-053034No 220060301THE CORROSION BEHAVIOUR OF Zn-4Al (AC43A) AND Sip/(Zn-4Al) COMPOSITES IN AN ARTIFICIAL SEA WATER57758611047510.21608/jesaun.2006.110475ENA. A OMARMining and Petroleum Engineering Department, Faculty of Engineering,
Al-Azhar University, Nasr City, Cairo, EGYPTA. KANDILMining and Petroleum Engineering Department, Faculty of Engineering,
Al-Azhar University, Nasr City, Cairo, EGYPTJournal Article20051210The corrosion behavior of the cast Zn-4Al and Si/(Zn-4Al) alloys when attacked by 3.5% NaCl solution at different temperatures, 31, 40, 50, and 60 0C was investigated. The Tafel intercept logarithmic polarization methods was utilized for determining the corrosion parameters. Some corrosion kinetic and mechanistic parameters have been studied in the absence and presence various concentration of K2CrO4. The study indicated that the percentage inhibition efficiency increased with the increase of the inhibitor concentration and decreased with increase of solution temperature. The activation energy of corrosion increased by the increase of both the corrosion rate and temperature. The addition of Si particles into Zn-4Al can greatly improve the corrosion resistance and has a significant effect on the Tafel polarization measurements. The corrosion resistance increase with increasing the volume fraction of Si-Particles.