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Articles 118561 - 118590 of 2933608
Full-Text Articles in Entire DC Network
Development Of Oee Error-Proof (Oee-Ep) Model For Production Process Improvement, Buliaminu Kareem, Adefowope S. Alabi, T I. Ogedengbe, B. O. Akinnuli, O. A. Aderoba
Development Of Oee Error-Proof (Oee-Ep) Model For Production Process Improvement, Buliaminu Kareem, Adefowope S. Alabi, T I. Ogedengbe, B. O. Akinnuli, O. A. Aderoba
The Journal of Engineering Research
The global demand for effective utilization of both humans and machinery is increasing due to wastage incurred during product manufacturing. Excessive waste generation has made entrepreneurs find it difficult to breakeven. The development of dynamic error-proof Overall Equipment Effectiveness (OEE) model for optimizing a complex production process is targeted at minimizing/eradicating operational wastes/losses. In this study, the error-proof sigma metric was integrated into the extended traditional OEE factors (availability, performance, quality) to include losses due to waste and man-machine relationships. Error-proof sigma statistics enabled continuous corrective measures on unsatisfactory or low-level OEE resulted from process output variations (quantity delivered or …
Spatial And Statistical Analysis Of Environmental Noise Levels In The Main Campus Of The University Of Lagos, Alfred Alademomi, Chukwuma Okolie, Babatunde Ojegbile, Olagoke Daramola, Johanson Onyegbula, Rahmat Adepo, Wemimo Ademeno
Spatial And Statistical Analysis Of Environmental Noise Levels In The Main Campus Of The University Of Lagos, Alfred Alademomi, Chukwuma Okolie, Babatunde Ojegbile, Olagoke Daramola, Johanson Onyegbula, Rahmat Adepo, Wemimo Ademeno
The Journal of Engineering Research
The increasing student population, developmental, and commercial activities within the University of Lagos main campus have led to an increase in daily noise levels. These increasing noise disturbances have disrupted the serenity and tranquillity of the campus environment. In this study, the noise levels are assessed at thirty–four selected monitoring stations within the University of Lagos main campus. The assessment was done to determine the compliance of the University to international standards set by World Health Organisation for tolerable noise levels in different environmental types (or land use classes). Over a period of three days, the minimum, maximum and average …
Modeling, Investigating, And Quantification Of The Hot Weather Effects On Construction Projects In Oman, Mubarak Khamis Al Alawi
Modeling, Investigating, And Quantification Of The Hot Weather Effects On Construction Projects In Oman, Mubarak Khamis Al Alawi
The Journal of Engineering Research
The construction industry is recognized as one of the industries most exposed to climatic conditions. Construction projects are mainly executed in an outdoor environment and the activities are considered weather-sensitive. Severe weather conditions can directly affect the productivity and efficient operation of construction projects. In addition, the weather is known to be one of the main factors that decrease labour productivity in construction projects causing project delays, cost overruns, and contractual claims between contractors and clients. Oman has a hot climate with very high temperatures in summer, warm winters, and low annual rainfall. During extremely hot weather, labour productivity significantly …
Analysis Of Factors Affecting Motivation In Projects: A Case Study In Oil And Gas Industry In Oman, Nasr Al-Hinai, Sujan Piya, Khalid Al-Wardi
Analysis Of Factors Affecting Motivation In Projects: A Case Study In Oil And Gas Industry In Oman, Nasr Al-Hinai, Sujan Piya, Khalid Al-Wardi
The Journal of Engineering Research
Motivation is a key element for successful project execution. However, different people are motivated by various means in different sectors. Hence, this work aims to study, analyze and define the main motivational factors in project execution in the oil and gas industry. To achieve this, a dedicated survey is prepared and distributed among employees working in the oil and gas industry in Oman. To ensure diversifications and minimize biases, the survey is distributed randomly to people working in projects in different organizations in the oil and gas industry. Altogether, 86 respondents completed all the survey questions. The study revealed that, …
Pedestrian Midblock Crossing Safety Development Modeling In Dohuk City Road Network, Ayman Abdulhadi Abdulmawjoud, Abdulkhalik A.M. Al-Taei
Pedestrian Midblock Crossing Safety Development Modeling In Dohuk City Road Network, Ayman Abdulhadi Abdulmawjoud, Abdulkhalik A.M. Al-Taei
The Journal of Engineering Research
: Pedestrians are vulnerable users walking on foot, having no or little protection-usually provided by police officers-when trying to cross from a midblock section in urban areas. A lot of conflicts and sometimes real pedestrian crashes probably took place in some locations in Dohuk City midblock crosswalks. For this purpose, and to have a comprehensive idea about the safety situation in this city, and what are the main safety countermeasures needed at some hazardous pedestrian crossing locations, this study was proposed. Data were collected from twenty crosswalk locations in central business district (CBD), and suburban areas related to pedestrian movement …
Sustainable Construction In Oman: The Potential Role Of The Industrialized Building Systems, Mohamed S. Saleh, Chaham Alalouch
Sustainable Construction In Oman: The Potential Role Of The Industrialized Building Systems, Mohamed S. Saleh, Chaham Alalouch
The Journal of Engineering Research
No abstract provided.
Probing The Effect Of Gaseous Hydrocarbon Precursors On The Adsorptive Efficiency Of Synthesized Carbon-Based Nanomaterials, Haiyam Alayan, Mustafa Mohammed Aljumaily, Mohammed Abdulhakim Alsaadi, Mohd Ali Hashim
Probing The Effect Of Gaseous Hydrocarbon Precursors On The Adsorptive Efficiency Of Synthesized Carbon-Based Nanomaterials, Haiyam Alayan, Mustafa Mohammed Aljumaily, Mohammed Abdulhakim Alsaadi, Mohd Ali Hashim
The Journal of Engineering Research
The present work investigates the effect of the type of carbon precursor on the adsorptive proficiency of as-prepared carbon nanomaterials (CNMs) for the removal of methylene blue dye (MB) from aqueous media. A comparison study was applied to assess the growth of CNMs from the decomposition of methane (CNMY1) and acetylene (CNMY2) using response surface methodology with central composite design (RSM/CCD). The produced nanomaterials were characterized using FESEM, EDX, TEM, BET surface area, Raman, TGA, FTIR, and zeta potential. The as-prepared adsorbent displayed different morphologies and under the experimental conditions, 10 mg of CNMY1 and CNMY2 was responsible for 97.7 …
Applicability Of Using Reverse Osmosis Membrane Technology For Wastewater Reclamation In The Gaza Strip, Mazen Abuatayef, Abedelmajeed Kahail, Hassan Al-Najjar, Thaer Abushbak
Applicability Of Using Reverse Osmosis Membrane Technology For Wastewater Reclamation In The Gaza Strip, Mazen Abuatayef, Abedelmajeed Kahail, Hassan Al-Najjar, Thaer Abushbak
The Journal of Engineering Research
No abstract provided.
In Achieving The Most Of Limited Research Budget For Engineering Research Projects: A Case Study At Sultan Qaboos University, M Zarog
The Journal of Engineering Research
Motivating engineering research in universities with limited or tight research budgets is a challenging task. There is always a conflict between researchers attempting to secure enough funds to ease their own research, and funding bodies and universities trying to achieve high quality research while lowering research expenses. This conflict leads to a situation where universities and researchers cannot achieve their goals altogether. This study attempts to partially resolve this issue by optimizing research expenditure for the benefit of both universities and researchers and suggests some policies regarding what type of research (modelling based or experimental based) universities should support. Other …
Cost Estimation Practices Prevalent In Construction Projects In Oman, Khalid Alzebdeh, M. Al-Siyabi, Ali Al-Nuaimi, Mohammad Khadem
Cost Estimation Practices Prevalent In Construction Projects In Oman, Khalid Alzebdeh, M. Al-Siyabi, Ali Al-Nuaimi, Mohammad Khadem
The Journal of Engineering Research
This paper reports findings of a study that captures cost estimation practices and techniques prevalent in the construction industry in Oman. It also identifies the success and risk factors that are encountered in the cost estimation process. Eighty structured questionnaires were distributed to some professionals working in construction projects, selected randomly from large and medium size enterprises across the Sultanate. A response rate of 56% was achieved. The results showed that the unit rate method, the use of historical data and benchmarking are the most common methods used for cost estimation. Success and risk factors as reported by respondents were …
Development Of Chicken Feather Reinforced Insulation Paperboard From Waste Carton And Portland Cement, J.K. Odusotea, K.S. Dosunmu
Development Of Chicken Feather Reinforced Insulation Paperboard From Waste Carton And Portland Cement, J.K. Odusotea, K.S. Dosunmu
The Journal of Engineering Research
No abstract provided.
Variant Developments Of Typical Meteorological Years (Tmys) For Seeb, Oman And Their Impact On Energy Simulation Of Residential Buildings, Nasser Al-Azri, Saleh Al-Saadi
Variant Developments Of Typical Meteorological Years (Tmys) For Seeb, Oman And Their Impact On Energy Simulation Of Residential Buildings, Nasser Al-Azri, Saleh Al-Saadi
The Journal of Engineering Research
Typical meteorological years (TMYs) are widely used for the analysis and simulation of energy-intensive systems. The reliability of a developed typical year depends on the accuracy of the historical record of weather data as well as the fitness of the developed approach to the application. In this work, a TMY for Seeb area in the Muscat Governorate, Oman was developed using different approaches. The developed TMYs are compared to the current commonly used TMY which is based on 1985-2001 records that have many gaps and anomalies and hence have intensive interpolation treatment. The different TMYs were compared by simulating energy …
Simulation-Optimization Model For Design Of Water Distribution System Using Ant Based Algorithms, Moeini R. R., Moulaei S.A.M. S.A.M.
Simulation-Optimization Model For Design Of Water Distribution System Using Ant Based Algorithms, Moeini R. R., Moulaei S.A.M. S.A.M.
The Journal of Engineering Research
In this paper, the Ant Colony Optimization Algorithm (ACOA) is applied to solve Water Distribution System design optimization problem proposing two different methods. Considering pipe diameters as decision variables of the problem, Ant System and Max-Min Ant System, referred to ACOA1 and ACOA2 respectively, are applied to determine pipe diameters. In proposed methods, the ant-based models are interfaced with EPANET as simulator for the hydraulic analysis. Three benchmark test examples are solved with proposed methods and the results are presented and compared with those obtained with other existing methods. The results show the capability of the proposed methods to optimally …
Performance Optimization Of Centrifugal Pump For Crude Oil Delivery, S.A.I. Bellary, Afzal Hussain, Abdus Samad, R.A. Kanai
Performance Optimization Of Centrifugal Pump For Crude Oil Delivery, S.A.I. Bellary, Afzal Hussain, Abdus Samad, R.A. Kanai
The Journal of Engineering Research
Crude oil transport is an essential task in oil and gas industries, where centrifugal pumps are extensively used. The design of a centrifugal pump involves a number of independent parameters which affect the pump performance. Altering some of the parameters within a realistic range improves pump performance and saves a significant amount of energy. The present research investigated the pump characteristics by modifying the number of blades and the exit blade-angles. Reynolds-Averaged Navier-Stokes equations with standard k-ε two-equation turbulence closure were used for steady and incompressible flow of crude oil through the pump. The experimental set-up was installed …
Out Of Axis Movement Of An Auv Inside A Water Pipeline, M. Moonesun, A. Mahdian, Y.M. Korol, A. Brazhko
Out Of Axis Movement Of An Auv Inside A Water Pipeline, M. Moonesun, A. Mahdian, Y.M. Korol, A. Brazhko
The Journal of Engineering Research
The research intends to evaluate the variation in the resistance and the lift of a torpedo shaped AUV brought about by the wall effect inside the pipe as it moves out of the axis inside a water pipeline. Movement of an AUV at the axis of a pipe causes minimum resistance and lift forces, but when the AUV moves at a position parallel with the axis of the pipe (out of axis of the pipe), the hydrodynamic forces especially the lift force changes. The AUV must be able to move a float inside the pipe and perform non-contact inspection. In …
Development Of A System Model For Determining Optimal Personnel Interaction Strategy In A Production Industry, B. Kareem, A. Adekiigbe
Development Of A System Model For Determining Optimal Personnel Interaction Strategy In A Production Industry, B. Kareem, A. Adekiigbe
The Journal of Engineering Research
Manufacturing organizations have become more complex in recent time as a result of technological advances. Communication among production workers operating in an environment marked by increased organizational complexity may require planning for the economically appropriate selection of network channels/media with enhanced productivity. This paper examines traditional and modern communication channels (media) and their comparative advantages over one another in their adoption in manufacturing organizations. In this framework, six media (human messengers, mobile-phones, intranet, fixed-internet, mobile-internet, and private branch exchange [PBX] phone systems) were subjected to analyses using five identified network patterns (all-channel, chain, Y, wheel, and circle) of interactions in …
A Comparative Study On Energy Derived From Biomass, A.M. Algarny, I.M. Al-Naimi, M.A.M Alhefnawy
A Comparative Study On Energy Derived From Biomass, A.M. Algarny, I.M. Al-Naimi, M.A.M Alhefnawy
The Journal of Engineering Research
The paper promotes sustainable community through empowering the production and utilization of biomass renewable energy. The aim of this paper is to urge societies to adopt sustainable energy practices and resources; the objective is to appraise the possibilities of biomass energy produced through a neighborhood in Eastern Province, Saudi Arabia. The system incorporates an evaluation of the measure of biomass created, then utilizes two ascertaining techniques to gauge whether the measure of energy can be delivered. The computation strategies are hypothetical, with one drawn from past works and the other from a Biomass Calculation Template performed as part of the …
An Investigation Of Excessive Seepage From The Al-Fulaij Recharge Dam, Oman, Y.E.A. Mohamedzein, S.M. Al-Hashmi, A.A. Al-Rawas
An Investigation Of Excessive Seepage From The Al-Fulaij Recharge Dam, Oman, Y.E.A. Mohamedzein, S.M. Al-Hashmi, A.A. Al-Rawas
The Journal of Engineering Research
The Al-Fulaij recharge dam is located on the Al Batinah coast in Oman and was constructed in 1992. The dam is about 3.3 km long and 7.7 m high with a storage capacity of 3.7 million cubic meters of water. It is an earthfill dam with silty, sandy gravel fill in the embankment. Excessive seepage of between 5,000–12,500 m3/day was observed during floods in 1993, and several sinkholes were noticed close to the upstream toe. Remedial work consisting of an upstream blanket and a cutoff trench wall was performed in 2000. However, these remedial measures failed and almost the same …
Prediction Of Permanent Deformation Of Foamed And Emulsified Sulfur Asphalt Soils Mixes, H.I. Al-Abdul Wahhab, G.M.S. Abdullah
Prediction Of Permanent Deformation Of Foamed And Emulsified Sulfur Asphalt Soils Mixes, H.I. Al-Abdul Wahhab, G.M.S. Abdullah
The Journal of Engineering Research
This paper presents a study carried out to evaluate and compare the permanent deformation of marginal soils. Under consideration were marl, sabkha and dune sand stabilized with foamed and emulsified sulfur asphalt (FSA, ESA) with mixes of the same soils stabilized with conventional foamed and emulsified asphalt (FA, EA) for road base construction. Designed mixes at their optimum asphalt content were evaluated for the dynamic resilient modulus (MR) at 22 °C and 40 °C and dynamic triaxial at three levels of deviatoric stress and at 22 °C and 40 °C. The wheel tracking (WT) test was carried out at 22 …
Variation In Methane Concentration Produced From Anaerobically Digested Vegetables, H. Mousa, M. Silwadi
Variation In Methane Concentration Produced From Anaerobically Digested Vegetables, H. Mousa, M. Silwadi
The Journal of Engineering Research
Anaerobic fermentation is a highly promising technology for converting biomass waste into methane, which then may directly be used as an energy source. Attempts have been made to optimize various parameters in order to determine the most favorable recipe for maximum biogas production from fermented vegetable waste. The biogas production from many types of vegetable waste such as zucchini, orange peel, tomato, potato, and rice was studied in batch digesters. The effect of adding chicken dung and sludge to vegetable waste on the concentration of methane in the produced biogas was investigated. The experiments were conducted at room temperature (20°C) …
Applying Interpretive Structural Modeling To Cost Overruns In Construction Projects In The Sultanate Of Oman, K. Alzebdeh, H.A. Bashir, S.K. Al Siyabi
Applying Interpretive Structural Modeling To Cost Overruns In Construction Projects In The Sultanate Of Oman, K. Alzebdeh, H.A. Bashir, S.K. Al Siyabi
The Journal of Engineering Research
Cost overruns in construction projects are a problem faced by project managers, engineers, and clients throughout the Middle East. Globally, several studies in the literature have focused on identifying the causes of these overruns and used statistical methods to rank them according to their impacts. None of these studies have considered the interactions among these factors. This paper examines interpretive structural modelling (ISM) as a viable technique for modelling complex interactions among factors responsible for cost overruns in construction projects in the Sultanate of Oman. In particular, thirteen interrelated factors associated with cost overruns were identified, along with their contextual …
Electromagnetic Field Detector Circuit For Low- Frequency Energy Applications, M.M. Bait-Suwailam
Electromagnetic Field Detector Circuit For Low- Frequency Energy Applications, M.M. Bait-Suwailam
The Journal of Engineering Research
This study details an electromagnetic (EM) field radiation detector system that was developed for near-field low-frequency energy applications. The prototype constitutes the use of a dual-band monopole antenna system as a probe along with a detecting circuit. Furthermore, the prototype was equipped with a qualitative EM radiation strength display unit at its output stage. For proof of concept, the detecting probe was implemented on a printed-circuit board. Both numerical simulations were based on PSpice software (Cadence Design Systems, Inc., San Jose, California, USA) and measurements are presented and discussed. The EM field detector aimed to sense any potential sources of …
M-Learning: The New Horizon Of Learning At Squ, Z. Al-Khanjari, K. Al-Kindi, A. Al-Zidi, Y. Baghdadi
M-Learning: The New Horizon Of Learning At Squ, Z. Al-Khanjari, K. Al-Kindi, A. Al-Zidi, Y. Baghdadi
The Journal of Engineering Research
M-learning extends the theory and practice of learning and mobility in converging technological environments. Developing a smart course in order to improve the standard of education at Sultan Qaboos University (SQU) is one of the main aims of the current authors. This proposal requires developing innovative applications for ubiquitous, mobile technologies for learning. This kind of development covers new educational and technological methods and concepts for supporting formal and informal learning. SQU is currently using Moodle as the open source e-learning management system to support and enhance traditional learning. Although elearning in SQU has proven its importance in enhancing traditional …
Finite Element Analysis Of Concrete Bridge Slabs Reinforced With Fiber Reinforced Polymer Bars, S.E. El-Gamal
Finite Element Analysis Of Concrete Bridge Slabs Reinforced With Fiber Reinforced Polymer Bars, S.E. El-Gamal
The Journal of Engineering Research
Due to their non-corrosive nature, high strength and light weight, fiber reinforced polymers (FRP) are being widely used as reinforcement in concrete bridges, especially those in harsh environments. The current design methods of concrete deck slabs in most bridge design codes assume a flexural behavior under traffic wheel loads. The load carrying capacities of concrete bridge deck slabs, however, are greatly enhanced due to the arching action effect developed by lateral restraints. This study presents the results of a non-linear finite element (FE) investigation that predicts the performance of FRP reinforced concrete (RC) deck slabs. The FE investigation is divided …
A Basic Wind Speed Map For Oman, A.S. Alnuaimi, M.A. Mohsin, K.H. Al-Riyami
A Basic Wind Speed Map For Oman, A.S. Alnuaimi, M.A. Mohsin, K.H. Al-Riyami
The Journal of Engineering Research
The aim of this research was to develop the first basic wind speed map for Oman. Hourly mean wind speed records from 40 metrological stations were used in the calculation. The period of continuous records ranged from 4–37 years. The maximum monthly hourly mean and the maxima annual hourly mean wind speed data were analysed using the Gumbel and Gringorten methods. Both methods gave close results in determining basic wind speeds, with the Gumbel method giving slightly higher values. Due to a lack of long-term records in some regions of Oman, basic wind speeds were extrapolated for some stations with …
Identification Of Pavement Distress Types And Pavement Condition Evaluation Based On Network Level Inspection For Jazan City Road Network, M Mubaraki
The Journal of Engineering Research
The first step in establishing a pavement management system (PMS) is road network identification. An important feature of a PMS is the ability to determine the current condition of a road network and predict its future condition. Pavement condition evaluation may involve structure, roughness, surface distress, and safety evaluation. In this study, a pavement distress condition rating procedure was used to achieve the objectives of this study. The main objectives of this study were to identify the common types of distress that exist on the Jazan road network (JRN), either on main roads or secondary roads, and to evaluate the …
Complementing Digital Logic Design With Logisim, Sa Al-Busaidi
Complementing Digital Logic Design With Logisim, Sa Al-Busaidi
The Journal of Engineering Research
Classified as free and open source software (FOSS), Logisim is a delightful tool that can easily be used to reinforce a solid understanding of the theoretical concepts related to a digital logic design course. Unlike LogicWorks, one of the most attractive features of Logisim is its ability to include user built libraries. This can result in the development of a library that models the complete set of integrated circuits (ICs) required for a digital logic design course. As a consequence, numerous merits can be observed regarding a student's learning level within such a course.
Comparison Of Interleaved Boost Converter Configurations For Solar Photovoltaic System Interface, R Ramaprabha, K Balaji, Sb Raj, Vd Logeshwaran
Comparison Of Interleaved Boost Converter Configurations For Solar Photovoltaic System Interface, R Ramaprabha, K Balaji, Sb Raj, Vd Logeshwaran
The Journal of Engineering Research
Solar photovoltaic (SPV) panels that convert light energy into electrical energy through the photovoltaic effect have nonlinear internal resistance. Hence, with the variation in the intensity of light falling on the panel, the internal resistance varies. For effective utilization of the SPV panel, it is necessary to extract the maximum power from it. For maximum power extraction from SPV panels, DC-DC converter interface is used. The problem in using high frequency converter interface is the resultant high frequency ripple interaction with the SPV system. In this work, an interleaved boost converter (IBC) is considered to reduce the ripple. Our finding …
Simulation Of Solar Radiation Incident On Horizontal And Inclined Surfaces, Ma Basunia, H Yoshio, T Abe
Simulation Of Solar Radiation Incident On Horizontal And Inclined Surfaces, Ma Basunia, H Yoshio, T Abe
The Journal of Engineering Research
A computer model was developed to simulate the hourly, daily and monthly average of daily solar radiation on horizontal and inclined surfaces. The measured hourly and daily solar radiation was compared with simulated radiation, and favourable agreement was observed for the measured and predicted values on clear days. The measured and simulated monthly averages of total (diffuse and beam) daily solar radiation were compared and a reasonable agreement was observed for a number of stations in Japan. The simulation showed that during the rice harvesting season, September to October, there is a daily average of 14.7 MJ/m2 of solar irradiation …
Reactive Power Based Model Reference Neural Learning Adaptive System For Speed Estimation In Sensor-Less Induction Motor Drives, K Sedhuraman, S Himavathi, A Muthuramalingam
Reactive Power Based Model Reference Neural Learning Adaptive System For Speed Estimation In Sensor-Less Induction Motor Drives, K Sedhuraman, S Himavathi, A Muthuramalingam
The Journal of Engineering Research
In this paper, a novel reactive power based model reference neural learning adaptive system (RP-MRNLAS) is proposed. The model reference adaptive system (MRAS) based speed estimation is one of the most popular methods used for sensor-less controlled induction motor drives. In conventional MRAS, the error adaptation is done using a Proportional-integral-(PI). The non-linear mapping capability of a neural network (NN) and the powerful learning algorithms have increased the applications of NN in power electronics and drives. Thus, a neural learning algorithm is used for the adaptation mechanism in MRAS and is often referred to as a model reference neural learning …