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1959 articles for “Disc” (ranking capped at the first 2,000 matches — narrow the search to see the rest)
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A Case Study: Diagnostic Testing of 16 MVA Power Transformer
Abstract: In this study describes the industrial research of tan delta test of power transformer (16 MVA 33/11 kV). In diagnostic test measurement, we check the insulation quality of power transformer. Transformer insulation quality is tested by insulation resistance test, tan delta and dissipation factor testing. In this article, we discussed about transformer tan delta test and comparison of transformer tan delta test result of after and before overhauling process. This …
Published in Journal of Power Electronics and Power Systems · Vol. 9, Issue 2, 2019 · pp. 1–4 Read article
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A Brief Review on Single Phase PV Micro-Inverter System
Abstract: This paper presents a review on recent developments and a summary of inverter technology for single phase grid-connected photovoltaic (PV) systems for power levels up to 5 kW. The functions of inverter include DC–AC conversion, output power quality assurance, various protection mechanisms, and system controls. PV inverters are classified in three categories which are centralized inverter, string inverter and module oriented or micro inverter. Centralized inverter, string inverter and module …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 2, 2015 · pp. 55–62 Read article
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Modeling and Simulation of a Chaotic Oscillator Using Mathematica
Abstract: This paper suggests a modified methodology for the modeling and simulation of a chaotic oscillator. Its analysis and the pertinent results of an efficient Mathematica simulation program dealing with a typical Chua's circuit are presented and discussed. The derived computer code is based on the application of state-variables in the time domain. The program yields the circuit’s currents and voltages and indicates their sensitivities to changes in the numerical values …
Published in Journal of Power Electronics and Power Systems · Vol. 11, Issue 1, 2021 · pp. 28–37 Read article
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Design and Analysis of a 100 kWp Grid Connected PV Solar Plant at a Coastal Area of Bangladesh
Abstract: In Bangladesh, the usage of electricity is continuously increasing. Govt. is also trying to increase the electricity production by installing new power plants to meet the additional power demands. Most of the power plants are natural gas-based, coal-based or nuclear power-based. Considering the greenhouse effect; solar power plants could be one of the best solutions to meet the additional power demands as well as it has a lot of financial …
Published in Journal of Power Electronics and Power Systems · Vol. 11, Issue 3, 2021 · pp. 33–39 Read article
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Impacts of Power Quality Issues in Electrical Distribution System
Abstract: The adoption of new modern technology and advance electronic equipment, energy saving methods, barriers, adopting of sustainable energy arrangements, generator power supply, invertors etc... harming the power quality of the electrical distribution system. If there is some kind divergence related to current, voltage and periodic at the load side that results in failure of consumer side equipment. In this paper we are going to discuss some factors which leads to …
Published in Journal of Power Electronics and Power Systems · Vol. 11, Issue 3, 2021 · pp. 40–47 Read article
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Different Ways to Maximize Electric Vehicle’s Battery Life
Abstract: This study examines alternative strategies for extending the battery life of electric vehicles (EVs). Enhancing the performance and endurance of batteries has been a crucial research area due to the rise in popularity of electric vehicles (EVs) in recent years and the growing concern about environmental issues. The significance of battery management systems (BMS), which can optimise charging and discharging cycles, and the effect of driving style on battery life …
Published in Journal of Power Electronics and Power Systems · Vol. 13, Issue 1, 2023 · pp. 44–49 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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Performance of Equation-of-State for Hydrocarbon Dew Point Control in Gas Flow-line in a Nigerian Field
Abstract: Associated gas in a flow-line in a Nigerian field was suspected to be accountable for unaccounted-for gas in the flow-station. Gas molecular compositions of Low Pressure suction gas and Injection Discharge gas for operating conditions of pressure and temperature from the field were analysed by the use of Soave-Redlich Kwong and Peng-Robinson Equations of State with PVTp thermodynamic software. The phase envelope predicted the Hydrocarbon dew point(s) observable from the …
Published in Journal of Petroleum Engineering & Technology · Vol. 9, Issue 1, 2019 · pp. 7–13 Read article
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Review of Subsea Pipeline for Minimizing Thermal and Pressure Expansion
Abstract: As the offshore oil and gas fields have been exploited in deeper water, subsea pipelines are required to operate at high temperatures and pressures. It causes subsea pipelines to be more subject to movements both in lateral and axial directions due to the loads produced by high temperatures and pressures. Some high temperature pipelines have experienced the cumulative axial displacement of an overall pipeline length over a number of start-up/shut-in …
Published in Journal of Petroleum Engineering & Technology · Vol. 4, Issue 1, 2014 · pp. 10–22 Read article
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An Overview of Recent Advances in Viscoelastic Surfactant based Fracturing Fluid Technology
Abstract: High percentages of oil and gas wells are hydraulically fractured worldwide in order to make economically producible at an efficient production rate. Cross-linked polymer fluids are in use for decades to stimulate oil and gas wells. Even though these fluids exhibit exceptional viscosity, thermal stability, proppant transportability and fluid leak-off control; extensive formation damage by polymer residues demanded a clean fracturing fluid technology. New generation of fracturing fluids based upon …
Published in Journal of Petroleum Engineering & Technology · Vol. 2, Issue 1-3, 2012 · pp. 11–25 Read article
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Predictability of Equation of State (EoS)-based Gas Hydrate Models for Single and Binary Gas Mixtures
Abstract: The better models are necessary to design and understand the phase behavior of produced trapped natural gas from natural gas hydrates from subsea environments. Most of the models available in an open literature are primarily applicable at relatively low pressure condition thus making their use very limited for gas hydrate reservoir modeling. In order to produce methane from these gas hydrates, it is important to understand the phase behavior through …
Published in Journal of Petroleum Engineering & Technology · Vol. 2, Issue 1-3, 2012 · pp. 83–91 Read article
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An Overview of Poroperm Relationship in the Recognition of Heterogeneity in Petroleum Reservoirs
Abstract: Reservoir heterogeneity is comprehended on different scales based on vertical and lateral variations in the hydrocarbon bearing sedimentary sequences. The two depositional systems, Sand-shale and carbonate with complex patterns based on properties of rocks help in deciding quality of rocks, the most important being the porosity permeability relationship. The intricate relationship of these two parameters if discussed in connection with sampling depth gives better understanding of variations in vertical direction …
Published in Journal of Petroleum Engineering & Technology · Vol. 11, Issue 1, 2021 · pp. 17–42 Read article
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Liquefied Oxygen Fracturing: A Simulative Approach
Abstract: The entire project is a work on the simulation of fracture design on a new potential fracturing fluid liquefied oxygen. The purpose of this study was to conduct a comparative study between hydraulic fracturing and cryogenic fracturing (liquefied oxygen) for the same reservoir having same properties to generate potential information on intrusion of fracturing fluid, pumping criteria, final stage pump pressure, required pumping time for both the fluids water as …
Published in Journal of Petroleum Engineering & Technology · Vol. 11, Issue 1, 2021 · pp. 43–51 Read article
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Design of a Process Plant for Dimethyl Ether Synthesis from Syngas Using Direct Method
Abstract: The search for alternative renewable and less polluting energy sources has gained prominence thus, there is an increasing interest in the use of Dimethyl Ether (DME) as a clean alternative fuel and raw material in the chemical industry. The simulation of a plant for the production of Dimethyl Ether from Syngas using direct synthesis method has been carried out in this work. The simulation was done using ASPEN HYSYS software. …
Published in Journal of Petroleum Engineering & Technology · Vol. 13, Issue 1, 2023 · pp. 44–59 Read article
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A Model of Bidding in Rotating Saving Credit Associations
Abstract: The paper analyzes bidding behavior in discount bidding Roscas under the assumption of risk neutrality. Roscas are group based revolving financial schemes. In discount bidding Roscas, individuals bid for a lumpsum. We find that bids submitted by members in equilibrium are increasing in the returns or opportunities for investment. Further, members submit lower bids when credit is available outside Rosca at expensive rates. A bidding Rosca is efficient as an …
Published in Journal of Production Research & Management · Vol. 7, Issue 1, 2017 · pp. 11–15 Read article
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Parallel Conwip for a High-mix Multi-stage Production System with the entrance of rework
Abstract: In a complex production environment, more than one type of pull systems is often used to regulate the processesof different products. In literature, performance studies appertaining to multiple pull systems co-existed in aproduction environment are rare. The present paper evaluates the performances of parallel CONWIP (PC)systems in a high-mix production system with the entrance of rework. The production comprises three stages ofshared-machine facilities. Reject parts produced by the first stage …
Published in Journal of Production Research & Management · Vol. 1, Issue 1-2-3, 2011 · pp. 21–44 Read article
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Progress of Graphene/Silicon Solar Cells-Present Status & Future Prospect
Abstract: The ever-increasing demand for next-generation high efficiency low cost solar cell has triggered interest to search for new materials which are easily available, environmentally benign as well as cost-effective. In this context, graphene has attracted tremendous importance due to its outstanding optical, electrical and mechanical properties, for possible application in future graphene/silicon Schottky and heterojunction solar cells. Significant progress has been noted as the power conversion efficiency of such cells …
Published in Journal of Semiconductor Devices and Circuits · Vol. 7, Issue 3, 2020 · pp. 19–29 Read article
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DC and RF Analysis on Specific Quantum-Well Heterostructures
Abstract: Polarization-graded AlGaN back-barrier nano-layer is introduced in high electron mobility transistor (HEMT) structure to have an improved drain current characteristics and better radio-frequency performance, using two-dimensional drift-diffusion simulation by SILVACO-ATLAS physical simulator. In this work, the AlGaN/AlN/GaN/AlGaN/GaN double heterojunction HEMT structure is optimised with graded back barrier layer to study the DC and RF performances. Investigation of this structure with graded back barrier layer is the novelty of this work. …
Published in Journal of Semiconductor Devices and Circuits · Vol. 9, Issue 1, 2022 · pp. 1–13 Read article
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A Review of Thermal Spray Coatings
Abstract: Thermal spray coatings are applied on surface of metals to improve their functional properties. Thermal spray technique offers the possibility to deposit wide range of ceramic coatings on metallic components. In the present paper we discuss the various types of coatings deposited using thermal spray techniques. The effect of rare earth metal oxides on microstructure and mechanical properties of the coatings are being discussed.
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 7, Issue 2, 2020 · pp. 1–6 Read article
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A Brief Overview of the Removal of Fluoride and Chromium Using Polymer Adsorbents
Abstract: Water tainted with heavy metals are the serious worldwide issues face today because of economic and industrial growth. Even at trace amounts, hexavalent chromium is a significant metal ion pollutant that is highly harmful to humans, animals, plants, and microbes. There are several methods for purifying water, but adsorption is one of the most straightforward, practical, and cost-effective approaches. Chromium is one such significant metal that may be released by …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 10, Issue 2, 2023 · pp. 1–14 Read article