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983 articles for “DRA”
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DC Power Flow Analysis as a Tool for the Study and Design of Multi-Terminal Electrical Grids
Abstract: The development and deployment of high voltage power electronic apparatus for the support and functioning of optimal operation and management of electrical grid networks is dependent on the progress of high power capacity semiconductor technology that has seen a rising trend over the past few years. These grids have certain different characteristics such as full or partial deregulation of their networks. These characteristics have advanced their application in many HVDC …
Published in Journal of Power Electronics and Power Systems · Vol. 4, Issue 3, 2014 · pp. 1–11 Read article
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Comparative Study of Boost, Elementary LUO and Super Lift LUO Converters for MPPT Photovoltaic Using P and O and Inc Methods
Abstract: The current Power demand of both industrial and domestic sectors forcing them to shift from traditional power sources to the green sources like Solar and Wind. Distributed Generation systems using solar and wind have multi-fold benefits compared to the traditional power generation. The Electrical power drawn from these renewables sources using MPPT methods such as Perturb & Observe (P&O), and Incremental Conductance (INC) methods are examined in this paper for …
Published in Journal of Power Electronics and Power Systems · Vol. 12, Issue 3, 2022 · pp. 26–43 Read article
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Modeling and Optimization of Continuous Gas Lift Performance in Libya Oil Field
Abstract: With a massive number of oil and gas field becoming mature, the upstream engineering is facing new challenge. How to develop , or at least steady production while keeping obtainable reserves at their existing level, As matter of fact unstable production in gas lift wells. The Key issues most operators encounter with oil fields are the effects of high water production that may lead to wells died and decrease in …
Published in Journal of Petroleum Engineering & Technology · Vol. 8, Issue 3, 2018 · pp. 40–48 Read article
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Productivity of Hydraulically Fractured Calcite Rich Shale Reservoirs Enhanced by Acid
Abstract: The current low oil prices have highlighted the need for enhancement to current production from shale formations. Prolonging the production life and increasing productivity of the fracture network in the shale plays can be a way to improve the economics. Many shale wells, drilled and completed based on current completion strategies, show sharp decline after initial flash production. One of the reasons behind this can be attributed to closure of …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 54–68 Read article
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Flexibility Analysis of Refinery Piping System
Abstract: Piping systems in downstream refineries and process plants experience a great thermal strain due to the difference between ambient and operating temperatures of process and utility fluid flowing through them. This thermal growth causes thermal stresses which leads to failure in piping components like flange leakage, deflection in piping, fractures at nozzle juncture and other fatal errors in piping system. Therefore, these piping structures must be flexible enough to support …
Published in Journal of Petroleum Engineering & Technology · Vol. 5, Issue 2, 2015 · pp. 53–59 Read article
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Improved Prediction of Fluid Contacts using Calibrated Material Balance Models
Abstract: The demand for oil has been on the high in the recent past and will continue as search for sustainable alternative energy sources intensifies. The exploration and exploitation of oil from subsurface reservoirs have posed several environmental challenges which include flaring and improper water disposal to name a few, caused by excessive production of gas and water. Hence, it is important to establish a reservoir performance monitoring scheme that will …
Published in Journal of Petroleum Engineering & Technology · Vol. 4, Issue 2, 2014 · pp. 25–36 Read article
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Pressure Data Analysis and Reservoir Parameter Estimation of Kailastilla Gas Field (Well No. KTL-01 and KTL-02)
Abstract: Well testing has been the subject of research for many decades. Well tests are performed in order to estimate reservoir properties. These estimations are needed to predict the amount of oil or gas that can be produced, and to determine a strategy how to produce this predicted amount. The current method to estimate the reservoir properties seems cumbersome and inefficient. Also, uncertainty regions of the estimated properties are not yet …
Published in Journal of Petroleum Engineering & Technology · Vol. 2, Issue 1-3, 2012 · pp. 92–102 Read article
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Implementation of Value Stream Mapping in Food Industry
Abstract: In present market firms are contemplating for enhancing their efficiency, item value, maximize utilization of their resources and to do so company needs lean manufacturing. Value stream mapping (VSM) can be recognized as critical instrument of lean manufacturing as it helps companies to identify wastes occurs in their processes and provides an approach to eliminate them. VSM helps industries maximize their available resources and helps to make efficient use of …
Published in Journal of Production Research & Management · Vol. 9, Issue 2, 2019 · pp. 1–8 Read article
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HVAC Design by Using Green Building Norms
Abstract: An HVAC system can be describing as a system which removes the heat from a desired space by pumping the heat from one place to another which result a cooling effect, also by lowering the temperature. HVAC work for a good indoor air quality by using latest filtering technologies. The major components of the HVAC system are, Heat exchanger, Evaporator coil, Thermostat, Refrigerant lines, Condensing unit, drain piping system, electrical …
Published in Journal of Production Research & Management · Vol. 11, Issue 3, 2021 · pp. 1–10 Read article
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New ERA of Education: Virtual Learning Environment
Abstract: Modern methods in order to improve the effectiveness of the education will be discussed, including the advantages, disadvantages, and use of the virtual learning environment (VLE). Information technology transfigure the economic world structure. It also provides a new learning and development opportunities in which well-trained workforce is needed. In the existence of a VLE, it can be a radical change of the existing aspects of the learning and interaction between …
Published in Journal of Production Research & Management · Vol. 11, Issue 3, 2021 · pp. 32–37 Read article
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Reducing Environmental Impact from Manufacturing–An Industrial Case Study
Abstract: There is a need for technologies and strategies that will reduce environmental impact from manufacturing globally. This paper presents an industrial case study with three objects of study where manufacturing of ‘green’ products are analysed and solutions are presented on reducing environmental impact from manufacturing. The objects represent a conceptual product, a manufacturing ready product and an update of an existing product. The case study also builds the base for …
Published in Journal of Production Research & Management · Vol. 1, Issue 1-2-3, 2011 · pp. 55–72 Read article
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External Loan: One Step Forward, Many Step Backward for Socio-Economic Development in Nigeria
Abstract: The paper focuses attention on the negative impact of external loan on the Nigerian socio-economic development. The desire for rapid socio-economic development at independence forced the leaders of the first republic to collect one form of loan or the other in order to improve the nation’s infrastructure. In the 1970’s the oil boom re-positioned Nigeria as one of the rich and potential countries destined for rapid socio-economic development. Unfortunately, the …
Published in Journal of Production Research & Management · Vol. 4, Issue 3, 2014 · pp. 15–22 Read article
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QFD Methodology Application to Vocational Training Centres: A Case Study
Abstract: The main population of the stakeholders comprised of students, faculty members, industry people, alumni, parents and members of the society. Based on the data collected from stakeholders needs and expectations of the specific customers for vocational training were assessed and finally the customer’s needs were prioritized and analyzed through QFD technique. For the statistical data analysis, the study used the SPSS software package. The results of the study showed that …
Published in Journal of Production Research & Management · Vol. 5, Issue 2, 2015 · pp. 34–51 Read article
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A Case Study on Performance of Credit Rating Agencies: An Overview
Abstract: Credit rating is one of the significant supporting services for the development of debt capital market. Recently, credit rating agencies have also started playing a pivotal role in the development of Indian common stock market by grading IPOs. But the rating agencies and their services are under scanner, particularly after the eruption of recession. In the backdrop of debate over the working of credit rating agencies all over the world, …
Published in Journal of Production Research & Management · Vol. 5, Issue 2, 2015 · pp. 16–23 Read article
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SPICE Modeling of LDMOSFET Transistor
Abstract: AbstractHigh voltage integrated circuits, these days are the most viable alternatives to discrete circuits for various applications. The popular amongst them is the lateral double diffused MOS transistor (LDMOS). It is based on the lightly doped drain (LDD) concept. The constraint that occurred in modeling LDMOS is to minimize the on-resistance along with maintaining a high breakdown voltage. To achieve the objective, the help of RESURF (Reduced Surface Field) concept …
Published in Journal of Semiconductor Devices and Circuits · Vol. 3, Issue 1, 2016 · pp. 42–57 Read article
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A Review on High Electron Mobility Transistors
Abstract: AbstractThe demand for high speed semiconductor devices is increasing in recent years with the rapid development of the high frequency wireless and fiber optical communication systems. High electron mobility transistor (HEMT) is an important device and an excellent candidate for millimeter, sub-millimeter and microwave applications. Also, these devices have high frequency, high speed, low noise, high breakdown voltage, low cost and other power handling capabilities. Due to these reasons, they …
Published in Journal of Semiconductor Devices and Circuits · Vol. 3, Issue 2, 2016 · pp. 1–10 Read article
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Impact of Source/Drain Engineering on Performance of Single Gate and Dual Gate Junctionless MOSFET
Abstract: Abstract: This letter is the study on impact of source/drain engineering on Single Gate (SG) and Dual Gate (DG) Junctionless MOSFET. Both the proposed MOSFET have Gate Stacking and highly doped source/drain region, so name suggested is Highly Doped Source Drain Gate Stack Junctionless (HDSD-GSJL) MOSFET. Here we investigate the effect of highly doped source/drain, gate stacking and double gate on junctionless MOSFET. The investigation is performed in relations of …
Published in Journal of Semiconductor Devices and Circuits · Vol. 6, Issue 1, 2019 · pp. 10–14 Read article
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Performance Analysis of Fully Flexible Organic Humidity Sensor with Top-Contact and Bottom-Contact OTFTs
Abstract: Abstract: Organic field-effect transistor (OFET) based humidity sensors are extensively used nowadays due to their low cost, mechanically flexible and compatibility with lower temperature fabrication techniques that support the plastic substrate based device and circuit applications. This paper investigates the humidity dependence of performance of organic humidity sensor with Top-Contact and Bottom-Contact OTFTs. Subsequently, impact of channel length on sensor performance is analyzed. The humidity sensitivity of organic sensor drain …
Published in Journal of Semiconductor Devices and Circuits · Vol. 6, Issue 1, 2019 · pp. 26–34 Read article
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Simulation Study of Process Variations in Double Gate Junctionless Field-Effect Transistors
Abstract: This work discusses the process variations in symmetrical double-gate (DG) junctionless (JL) field-effect transistors (FETs) by device simulation. Output I-V characteristics along with subthreshold slope increase, DIBL variations with drain voltage and threshold voltage shift variations are systematically analyzed with the general variability issues including oxide thickness, channel thickness and doping concentration. Potential distribution in the body channel region is also analyzed. Optimum values of the variability factors are considered …
Published in Journal of Semiconductor Devices and Circuits · Vol. 2, Issue 2, 2015 · pp. 18–27 Read article
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Design and Performance of Semiconductor-Biosensor
Abstract: In this work, a high electron mobility transistor (HEMT) based biosensor is designed to detect the virus-protein. In this work, all the simulation-studies are carried out in the SILVACO-ATLAS physical simulator using the following models: Shockley Read Hall (SRH), band gap narrowing, Auger recombination, and Fermi Dirac statistics. Newton trap numerical solver is used in the device simulation. Conduction band engineering of the biosensor is studied. DC and RF properties …
Published in Journal of Semiconductor Devices and Circuits · Vol. 8, Issue 2, 2021 · pp. 1–13 Read article