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Articles 33001 - 33030 of 713655
Full-Text Articles in Entire DC Network
Complexity Analysis Of Industrial Organizations Based On A Perspective Of Systems Engineering Analysts, I. H. Garbie, A. A. Shikdar
Complexity Analysis Of Industrial Organizations Based On A Perspective Of Systems Engineering Analysts, I. H. Garbie, A. A. Shikdar
The Journal of Engineering Research
Complexity in industrial organizations became more difficult and complex to be solved and it needs more attention from academicians and technicians. For these reasons, complexity in industrial organizations represents a new challenge in the next decades. Until now, analysis of industrial organizations complexity is still remaining a research topic of immense international interest and they require reduction in their complexity. In this paper, analysis of complexity in industrial organizations is shown based on the perspective of systems engineering analyst. In this perspective, analysis of complexity was divided into different levels and these levels were defined as complexity levels. A framework …
Flow Asymmetry In Symmetric Multiple Impinging Jets: A Large Eddy Simulation Approach, N. Kharoua, L. Khezzar
Flow Asymmetry In Symmetric Multiple Impinging Jets: A Large Eddy Simulation Approach, N. Kharoua, L. Khezzar
The Journal of Engineering Research
A numerical study on in-line arrays of multiple turbulent round impinging jets on a flat heated plate was conducted. The Large Eddy Simulation turbulence model was used to capture details of the instantaneous and mean flow fields. The Reynolds number, based on the jets diameter, was equal to 20,000. In addition to flow features known from single jets, the interaction between the neighboring jets was successfully elucidated. Symmetry boundary conditions were imposed to reduce the computational domain to only a quarter. In accordance with previous numerical and experimental works, the asymmetry in the velocity field near to the impingement plate …
Transition Of Gas-Liquid Stratified Flow In Oil Transport Pipes, D. Lakehal, M. Labois, D. Caviezel, B. Belhouachi
Transition Of Gas-Liquid Stratified Flow In Oil Transport Pipes, D. Lakehal, M. Labois, D. Caviezel, B. Belhouachi
The Journal of Engineering Research
Large-Scale Simulation results of the transition of a gas-liquid stratified flow to slug flow regime in circular 3D oil transport pipes under turbulent flow conditions expressed. Free surface flow in the pipe is treated using the Level Set method. Turbulence is approached via the LES and VLES methodologies extended to interfacial two-phase flows. It is shown that only with the Level Set method the flow transition can be accurately predicted, better than with the two-fluid phase-average model. The transition from stratified to slug flow is found to be subsequent to the merging of the secondary wave modes created by the …
Physics Of Breakup In Liquid Column And Sheet, M. Ali, M. Q. Islam, M. Khadem
Physics Of Breakup In Liquid Column And Sheet, M. Ali, M. Q. Islam, M. Khadem
The Journal of Engineering Research
The details on breakup processes of liquid column and sheet are numerically investigated to provide the physics of the capillary instabilities and formation of liquid drops. Two cases are used: A numerical analysis on the capillary instabilities and breakup processes of a cylindrical liquid column and a moving liquid sheet in a moving gaseous medium to analyze the dynamics and breakup of the liquid sheet. The problem, composed of the Navier-Stokes systems associated with surface tension forces, is solved by the Volume of Fluid (VOF) technique with a Continuum Surface Force (CSF) to artificially smooth the discontinuity present at the …
Different Zoom Approaches For Improving Spectral Resolution With Applications In Radar Signal Processing, A. Hossen, U. Heute
Different Zoom Approaches For Improving Spectral Resolution With Applications In Radar Signal Processing, A. Hossen, U. Heute
The Journal of Engineering Research
Different approaches for a high-resolution analysis of narrow-band spectra are reviewed and compared. Partial-band algorithms are proved to be zoom-FFT's. In this contribution, three new modifications of the (Subband-FFT) SB-FFT are presented. In the first modification the chirp z-transform substitutes the small FFT which calculates the band of interest. In the second modification, the idea of zero-padding the input signal is applied to the SB-FFT with pruning at both input and output. Lastly zooming a small band of frequencies using a method of transforming by parts is applied for a narrow-band signal using the adaptive SB-FFT. A newly introduced version …
Neuro-Fuzzy Sensor Fault Diagnosis Of An Induction Motor, M. L. Benloucif
Neuro-Fuzzy Sensor Fault Diagnosis Of An Induction Motor, M. L. Benloucif
The Journal of Engineering Research
In this paper, a neuro-fuzzy fault diagnosis scheme is presented and its ability to detect and isolate sensor faults in an induction motor is assessed. This fault detection and isolation (FDI) approach relies on a combination of neural modelling and fuzzy logic techniques which can deal effectively with nonlinear dynamics and uncertainties. It is based on a two step neural network procedure: a first neural network is used for residual generation and a second fuzzy neural network performs residual evaluation. Simulation results are given to demonstrate the efficiency of this FDI approach.
A New Universal Second-Order Filter Using Configurable Analog Building Blocks (Cabs) For Filed-Programmable Analogue Arrays, M. T. Abuelma'atti, O. O. Fares
A New Universal Second-Order Filter Using Configurable Analog Building Blocks (Cabs) For Filed-Programmable Analogue Arrays, M. T. Abuelma'atti, O. O. Fares
The Journal of Engineering Research
In this paper, the design of a universal second-order filter using configurable analog blocks (CABs) for field programmable analog arrays is presented. The configurable blocks are capable of performing integration, differentiation, amplification, log, anti-log, add and negate functions. To maintain high frequency operation, the programmability and configurability of the blocks are achieved by digitally modifying the block's biasing conditions. Using at most four CABs, this article shows that it is possible to design a versatile second-order filter realizing all the standard five filter functions; lowpass, highpass, bandpass, notch and allpass. SPICE simulation results using practical bipolar junction transistor (BJT) parameters …
A General Model For Describing The Performance Of Brushless Doubly-Fed Induction Machines, S. M. Allam, A. M. Azmy, M. A. El-Khazendar
A General Model For Describing The Performance Of Brushless Doubly-Fed Induction Machines, S. M. Allam, A. M. Azmy, M. A. El-Khazendar
The Journal of Engineering Research
This paper presents a generalized model, by which the dynamic and steady-state behaviour of the Brushless Doubly-Fed Induction Machine (BDFIM) can be precisely predicted. The investigated doubly-fed machine has two sets of three-phase stator windings with different pole numbers. The rotor is a squirrel-cage type with a simple modification in order to support the two air-gap rotating fields that are produced by the stator windings and have different pole numbers. The machine model is derived in the qdo-axis variables. The qdoaxes are attached to rotor and hence, it rotates at the rotor speed (
Multi-Objective Optimization Of Submerged Arc Welding Process, Saurav Datta, Siba Sankar Mahapatra
Multi-Objective Optimization Of Submerged Arc Welding Process, Saurav Datta, Siba Sankar Mahapatra
The Journal of Engineering Research
Submerged arc welding (SAW) is an important metal fabrication technology specially applied to join metals of large thickness in a single pass. In order to obtain an efficient joint, several process parameters of SAW need to be studied and precisely selected to improve weld quality. Many methodologies were proposed in the past research to address this issue. However, a good number of past work seeks to optimize SAWprocess parameters with a single response only. In practical situations, not only is the influence of process parameters and their interactive effects on output responses are to be critically examined but also an …
A Corrective Strategy To Alleviate Overloading In Transmission Lines Based On Particle Swarm Optimization Method, Manoj Kumar Maharana, K. Shanti Swarup
A Corrective Strategy To Alleviate Overloading In Transmission Lines Based On Particle Swarm Optimization Method, Manoj Kumar Maharana, K. Shanti Swarup
The Journal of Engineering Research
This paper presents novel corrective control actions to alleviate overloads in transmission lines by the Particle Swarm Optimization (PSO) method. Generator rescheduling and/or load shedding is performed locally, to restore the system from abnormal to normal operating state. The appropriate identification of generators and load buses to perform the corrective control action is an important task for the operators. Anew Direct Acyclic Graph (DAG) technique for selection of participating generators and buses with respect to a contingency is presented. The effectiveness of the proposed approach is demonstrated with the help of the IEEE 30 bus system. The result shows that …
Determination Of Potential Profile In Planar Electronic Structures Using A Semi-Analytical Technique, Hadj Bourdoucen, Mokrane Dehmas, El-Bachir Yallaoui
Determination Of Potential Profile In Planar Electronic Structures Using A Semi-Analytical Technique, Hadj Bourdoucen, Mokrane Dehmas, El-Bachir Yallaoui
The Journal of Engineering Research
In this paper, a semi-analytical technique known as the Method of Lines (MoL) with uniform and non-uniform discretization schemes is developed. The aim is to determine static potential profile in planar electronic structures. Even though this method has been known for some time, there has been reported work on its application to planar semiconductor device analysis for voltage profile determination. Since most current electronic devices are manufactured using planar and quasi-planar technology, the proposed algorithm is well suited for device analysis prior to fabrication. Compared with known popular methods such as Finite Difference and Finite Elements methods, the proposed technique …
Uptake Of Cd(Ii) Using Natural Zeolite: Batch And Continuous Fixed-Bed Studies, Luna M. Lmarashdeh, Ahmad M. Al-Haj-Ali
Uptake Of Cd(Ii) Using Natural Zeolite: Batch And Continuous Fixed-Bed Studies, Luna M. Lmarashdeh, Ahmad M. Al-Haj-Ali
The Journal of Engineering Research
Uptake of Cd(II) ions by natural phillipsite tuff was investigated both in shake-flask and fixed-bed columns. Equilibrium uptake, qe, was found to best fit Langmuir adsorption isotherm with a maximum value of 25.78 mg/g. Percent removal of Cd ions was close to 100% from initial metal ion concentrations in the range 50 - 75 mg/L at 5.0 g zeolite/L. Also, qe was found to vary exponentially with zeolite dose. Break points as high as 350 minutes were obtained from bed treatment at favorable conditions of a low solution flow rate and high bed depth. In batch experiments, equilibrium pH increased …
A Less Complex Algorithmic Procedure For Computing Gray Codes, Afaq Ahmad, Mohammed M. Bait Suwailam
A Less Complex Algorithmic Procedure For Computing Gray Codes, Afaq Ahmad, Mohammed M. Bait Suwailam
The Journal of Engineering Research
The purpose of this paper is to present a new and faster algorithmic procedure for generating the n bi Gray codes. Thereby, through this paper we have presented the derivation, design and implementation of a newly developed algorithm for the generation of an n-bit binary reflected Gray code sequences. The developed algorithm is stemmed from the fact of generating and properly placing the min-terms from the universal set of all the possible min-terms [m0 m1 m2 …. mN] of Boolean function of n variables, where, 0 < N < 2n-1. The resulting algorithm is in concise form and trivial to implement. Furthermore, the developed algorithm is equipped with added attributes of optimizing of time and space while executed.
Effect Of Material Parameters On Steady State Creep In A Thick Composite Cylinder Subjected To Internal Pressure, Tejeet Singh, V.K. Gupta
Effect Of Material Parameters On Steady State Creep In A Thick Composite Cylinder Subjected To Internal Pressure, Tejeet Singh, V.K. Gupta
The Journal of Engineering Research
The steady state creep in Al- SiCP composite cylinder subjected to internal pressure was investigated. The creep behavior of the material were described by threshold stress based creep law by assuming a stress exponent of 5. The effect of size and content of the reinforcement (SiCP ), and operating temperature on the stresses and strain rates in the composite cylinder were investigated. The stresses in the cylinder did not have significant variation with varying size and content of the reinforcement, and operating temperature. However, the tangential as well as radial strain rates in the cylinder could be reduced to a …
Structural System Identification In The Time Domain Using Evolutionary And Behaviorally Inspired Algorithms And Their Hybrids, S. Sandesh, Abhishek Kumar Sahu, K. Shankar
Structural System Identification In The Time Domain Using Evolutionary And Behaviorally Inspired Algorithms And Their Hybrids, S. Sandesh, Abhishek Kumar Sahu, K. Shankar
The Journal of Engineering Research
In this study, parametric identification of structural properties such as stiffness and damping is carried out using acceleration responses in the time domain. The process consists of minimizing the difference between the experimentally measured and theoretically predicted acceleration responses. The unknown parameters of certain numerical models, viz., a ten degree of freedom lumped mass system, a nine member truss and a non-uniform simply supported beam are thus identified. Evolutionary and behaviorally inspired optimization algorithms are used for minimization operations. The performance of their hybrid combinations is also investigated. Genetic Algorithm (GA) is a well known evolutionary algorithm used in system …
An Electronic Method For Measuring The Fit Of Removable Partial Denture Frameworks To Dental Casts, Robert J. Williams, Tahseen Rafik, Zeid Al-Hourani
An Electronic Method For Measuring The Fit Of Removable Partial Denture Frameworks To Dental Casts, Robert J. Williams, Tahseen Rafik, Zeid Al-Hourani
The Journal of Engineering Research
It is well established that the Removable Partial Denture (RPD) is an effective treatment prosthesis. The objectives of a successful RPD are: to preserve the health of remaining oral structure, restore function and restore esthetics. To achieve these objectives, an RPD framework must fit accurately to the supporting structures. This paper presents a method for measuring the gaps or spaces present between the RPD framework and supporting structures which will enable the dentist and the dental technician to evaluate the accuracy of fitting of the prosthesis before it is delivered to the patient. The method used in this research is …
Mass Transfer Studies With Submerged Impinging Jets In Closed Cylindrical Electrolytic Cell In The Presence Of Solids, S. Feroz, B.V.L. Rao, C. Bhaskarasarma, V.S.R.K. Prasad
Mass Transfer Studies With Submerged Impinging Jets In Closed Cylindrical Electrolytic Cell In The Presence Of Solids, S. Feroz, B.V.L. Rao, C. Bhaskarasarma, V.S.R.K. Prasad
The Journal of Engineering Research
An experimental study of mass transfer in forced convective flow of fluid electrolyte through submerged jets impinging normal to the target surface in a closed cylindrical cell in the presence of solids (Porcelain beads) is reported. The pertinent dynamic and geometric variables of this study are flow rate, diameter of the nozzle, height of the nozzle from the target surface and solids fraction. The mass transfer measurements, made by the electrochemical method propose empirical correlations in the impingement and decreasing coefficient regions.
Comparison Between Experimental And 3d Finite Element Analysis Of Reinforced And Partially Pre-Stressed Concrete Solid Beams Subjected To Combined Load Of Bending, Torsion And Shear, A. S. Alnuaimi
The Journal of Engineering Research
This paper presents a non-linear analysis of three reinforced and two partially prestressed concrete solid beams based on a 20 node isoparametric element using an in-house 3D finite element program. Anon linear elastic isotropic model, proposed by Kotsovos, was used to model concrete behaviour, while steel was modelled as an embedded element exhibiting elastic-perfectly plastic response. Allowance was made for shear retention and for tension stiffening in concrete after cracking. Only in a fixed direction, smeared cracking modelling was adopted. The beams dimensions were 300x300 mm cross section, 3800 mm length and were subjected to combined bending, torsion and shear. …
Identification Of Friction/Vibration Interaction Between Solids, J. A. Abdo, N. Al-Rawahi
Identification Of Friction/Vibration Interaction Between Solids, J. A. Abdo, N. Al-Rawahi
The Journal of Engineering Research
Dry-friction forces have been shown to depend not only on the characteristics of the surface in contact but also on the dynamic interaction of the contacting bodies. A viscoelastic mathematical model that accounts for the interaction at micro-scale of rough surfaces is developed. The mathematical formulation relates the tribological events at microscopic and macroscopic scales vibration response of a "mass on moving belt". The viscoelastic properties are presented by combining loss modulus with Young's modulus to obtain a differential operator on the interference, reminiscent of the Kelvin-Voigt model. The analysis of the system establishes the relation between friction force and …
Solar-Driven Air-Conditioning Cycles: A Review, A. M. Abu-Zour, S. B. Riffat
Solar-Driven Air-Conditioning Cycles: A Review, A. M. Abu-Zour, S. B. Riffat
The Journal of Engineering Research
Most conventional cooling/refrigeration systems are driven by fossil fuel combustion, and therefore give rise to emission of environmentally damaging pollutants. In addition, many cooling systems employ refrigerants, which are also harmful to the environment in terms of their Global Warming Potential (GWP) and Ozone Depletion Potential (ODP). Development of a passive or hybrid solar-driven air-conditioning system is therefore of interest as exploitation of such systems would reduce the demand for grid electricity particularly at times of peak load. This paper presents a review of various cooling cycles and summarises work carried out on solar-driven air-conditioning systems.
Analytical Modelling And Simulation Of Photovoltaic Panels And Arrays, H. Bourdoucen, A. Gastli
Analytical Modelling And Simulation Of Photovoltaic Panels And Arrays, H. Bourdoucen, A. Gastli
The Journal of Engineering Research
In this paper, an analytical model for PV panels and arrays based on extracted physical parameters of solar cells is developed. The proposed model has the advantage of simplifying mathematical modelling for different configurations of cells and panels without losing efficiency of PV system operation. The effects of external parameters, mainly temperature and solar irradiance have been considered in the modelling. Due to their critical effects on the operation of the panel, effects of series and shunt resistances were also studied. The developed analytical model has been easily implemented, simulated and validated using both Spice and Matlab packages for different …
Seismic Response Of Pure-Friction Base Isolated Masonry Building With Restricted Base-Sliding, M. Qamaruddin, S. Ahmad
Seismic Response Of Pure-Friction Base Isolated Masonry Building With Restricted Base-Sliding, M. Qamaruddin, S. Ahmad
The Journal of Engineering Research
The earthquake response of pure-friction base isolated masonry building with restricted base sliding is presented in this paper. A clear smoothened surface is created at the plinth level of the building above the damp-proof course, and the superstructure rests at this level to slide freely, except for the frictional resistance and the rigid stopper. As the superstructure is free to slide at the plinth level, there will be a feeling to the occupants that it might slide more than the permissible relative displacement limit provided at the top of the substructure. This may create a fear among the occupants that …
Numerical Modeling Of Foam Drilling Hydraulics, Ozcan Baris, Luis Ayala, W. Watson Robert
Numerical Modeling Of Foam Drilling Hydraulics, Ozcan Baris, Luis Ayala, W. Watson Robert
The Journal of Engineering Research
The use of foam as a drilling fluid was developed to meet a special set of conditions under which other common drilling fluids had failed. Foam drilling is defined as the process of making boreholes by utilizing foam as the circulating fluid. When compared with conventional drilling, underbalanced or foam drilling has several advantages. These advantages include: avoidance of lost circulation problems, minimizing damage to pay zones, higher penetration rates and bit life. Foams are usually characterized by the quality, the ratio of the volume of gas, and the total foam volume. Obtaining dependable pressure profiles for aerated (gasified) fluids …
Heat Transfer Enhancement In A Ribbed Duct, J.M. Jalil, T.K. Murtadha, H.M. Kadom
Heat Transfer Enhancement In A Ribbed Duct, J.M. Jalil, T.K. Murtadha, H.M. Kadom
The Journal of Engineering Research
The rib enhancement of heat transfer in a duct is studied numerically and experimentally, where hot air passes through a duct (0.04 x 0.16 x 1.15 m3) with different rib arrangement. The arranments are lower 12-rib arrangement; upper 12 rib arrangement and 24 rib staggered arrangement. The staggered arrangement gives better performance than the others. Also, the angle of attack was studied for lower arrangement, three different values were tested (45°, 60° and 90°). Angle of 60° gives better performance. Numerically, the three-dimension continuity, Navier-Stokes and energy by finite volume method of flow of air through (0.04 x 0.16 x …
Generalized Model For Spectral Efficiency Of Cellular Systems, A.M. Abbosh
Generalized Model For Spectral Efficiency Of Cellular Systems, A.M. Abbosh
The Journal of Engineering Research
A general mathematical model was used to study the spectral efficiency of cellular systems. The model took into consideration effects of first and second tier interference. The random distribution of users across the whole area covered by the cellular system as well as the shadowing and multipath effects were taken into account. The influence of sectorization on value of the spectral efficiency was also studied. The model investigated the effects of the cell radius and cluster size on the spectral efficiency. The influence of different propagation conditions on the spectral efficiency was also considered. Results of simulation showed that an …
Takagi-Sugeno Neuro-Fuzzy Modeling Of A Multivariable Nonlinear Antenna System, E. A. Al-Gallaf
Takagi-Sugeno Neuro-Fuzzy Modeling Of A Multivariable Nonlinear Antenna System, E. A. Al-Gallaf
The Journal of Engineering Research
This article investigates the use of a clustered based neuro-fuzzy system to nonlinear dynamic system modeling. It is focused on the modeling via Takagi-Sugeno (T-S) modeling procedure and the employment of fuzzy clustering to generate suitable initial membership functions. The T-S fuzzy modeling has been applied to model a nonlinear antenna dynamic system with two coupled inputs and outputs. Compared to other well-known approximation techniques such as artificial neural networks, the employed neuro-fuzzy system has provided a more transparent representation of the nonlinear antenna system under study, mainly due to the possible linguistic interpretation in the form of rules. Created …
A Modified Approach In Modeling And Calculation Of Contact Characteristics Of Rough Surfaces, J.A. Abdo
A Modified Approach In Modeling And Calculation Of Contact Characteristics Of Rough Surfaces, J.A. Abdo
The Journal of Engineering Research
A mathematical formulation for the contact of rough surfaces is presented. The derivation of the contact model is facilitated through the definition of plastic asperities that are assumed to be embedded at a critical depth within the actual surface asperities. The surface asperities are assumed to deform elastically whereas the plastic asperities experience only plastic deformation. The deformation of plastic asperities is made to obey the law of conservation of volume. It is believed that the proposed model is advantageous since (a) it provides a more accurate account of elasticplastic behavior of surfaces in contact and (b) it is applicable …
Development Of Asphalt Pavement Temperature Models For Oman, H.F. Hassan, A.S. Al-Nuaimi, T.M.A. Jafar
Development Of Asphalt Pavement Temperature Models For Oman, H.F. Hassan, A.S. Al-Nuaimi, T.M.A. Jafar
The Journal of Engineering Research
Asphalt pavements form an integral part of any transportation system. The structural capacity of the hot mix asphalt concrete layers depends on many factors including its temperature. Moreover, temperature can be a major contributor to several types of distresses. Therefore, temperature is a significant factor that affects the performance and life span of a pavement. The Sultanate of Oman's road network expanded at a phenomenal pace from approximately 10 km of paved roads in 1970 to 9,673 km in 2001. with the recent SHRP and LTTP research findings, it was necessary to investigate the applicability of the models developed from …
Facility Location For Solid Waste Management Through Compilation And Multicriterial Ranking Of Optimal Decentralised Scenarios: A Case Study For The Region Of Peloponesse In Southern Greece, A. Karagiannidis, G. Perkoulidis, N. Moussiopoulos, M. Chrysochoou
Facility Location For Solid Waste Management Through Compilation And Multicriterial Ranking Of Optimal Decentralised Scenarios: A Case Study For The Region Of Peloponesse In Southern Greece, A. Karagiannidis, G. Perkoulidis, N. Moussiopoulos, M. Chrysochoou
The Journal of Engineering Research
The present paper addresses the problem of locating solid waste management facilities.Specifically, it studies and proposes optimal alternative solutions for the Greek Region of Peloponnese,by examining facilities for transferring, sorting, treating and landfilling of wastes. Quantitative and qualitative databases concerning the current solid waste management at the Region have been created and used by the model. A customized mixed-integer linear network model has been developed and solved for various evaluation criteria on a single-criterion basis by the use of a location-allocation modeling framework.The solutions resulting from the parametrical application of the multicriterial method ELECTRE III are then ranked for the …
The Effect Of A Stem-Based Enrichment Unit On Gifted Sixth Graders’ Academic Achievement, Problem-Solving Skills, And Attitudes Towards Stem, Aisha Abdulkader Cheikhmous
The Effect Of A Stem-Based Enrichment Unit On Gifted Sixth Graders’ Academic Achievement, Problem-Solving Skills, And Attitudes Towards Stem, Aisha Abdulkader Cheikhmous
Thesis/ Dissertation Defenses
This study aimed to examine the effect of a STEM-based enrichment unit on gifted learners’ academic achievement, problem-solving skills, and attitudes towards STEM. The participants were 33 female sixth-grade students attending the Elite Stream at a public school in the United Arab Emirates. To collect the data, the study followed a triangulation mixed-methods research design where the qualitative data was collected from the researcher’s observations during the program implementation. Furthermore, the quantitative data was obtained from a content-based test that focused on problemsolving skills, a survey on students’ attitudes towards STEM, and the End-of-Term summative achievement exam scores in Mathematics, …