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1184 articles for “dense”
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Synergistic effect of AlN and 2D-BN Nanoplatelets on Phase Transition Kinetics and Thermal Transport of Eutectic Phase Change Materials
Abstract: High-power-density electronic appliances are in demand to meet the necessity from modern sustainable society. The heat generated with the continuous functioning need to be dissipated to keep electronics cool to retain efficiency and performance. To suppress heat accumulation, surplus heat needs to be controlled by adapting efficient cooling technologies. As an alternative, nanomaterials-enabled phase change materials (PCM)-based cooling is appropriate to curb temperature shoot. This work focuses on developing eutectic …
Published in Journal of Polymer & Composites · Vol. 12, Issue 1, 2024 · pp. 11–16 Read article
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Electrochemical Exfoliation of Graphene Oxide (GO) and Thermally Reduced Graphene Oxide (TrGO) Using Ecofriendly Reducing Agent as Cow Urine
Abstract: The Graphene oxide (GO), the reduced form of GO i.e. (rGO) with thermally reduced graphene oxide (TrGO), have concerned significant interest in various fields with their exceptional properties. We investigate the electrochemical exfoliation processes of GO and rGO to understand their structural and electrochemical behavior of GO and TrGO through various characterization techniques. The electrochemical exfoliation method offers a versatile and scalable approach for the mass fabrication of the materials …
Published in Journal of Polymer & Composites · Vol. 12, Issue 1, 2024 · pp. 89–100 Read article
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Supercapacitor-Battery Hybridization to Prevent Battery Life for Pulsed Load Applications
Abstract: Management of power in the pulsed load applications has become a significant issue when it comes to the battery backup systems. For the pulsed load applications, deep discharge of the battery and battery health problems are very well known. In this paper, an attempt is made to overcome these key challenges by connecting a high power density device, ultracapacitor (super capacitor) in parallel with the battery. The role of ultracapacitor …
Published in Journal of Power Electronics and Power Systems · Vol. 8, Issue 1, 2018 · pp. 1–15 Read article
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Grid Integrated Micro Inverter for PV Module with Anti-Islanding and MPPT Schemes
Abstract: From the economic perspective, densely populated areas can generate great amounts of electric power by installing PV panels on its rooftops and it can be fed in to the grid. This study describes a grid tied micro inverter for photovoltaic applications. The system consists of a Cuk converter connected with a full-bridge current source inverter. The connection of micro inverter systems to the grid can raise several challenges as the …
Published in Journal of Power Electronics and Power Systems · Vol. 8, Issue 3, 2018 · pp. 39–45 Read article
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Power Supply Design Issues for Personnel Computers Application: A Review
Abstract: A power supply should meet various requirements for proper functioning of a PC. Electromagnetic Interface (EMI) causes catastrophic failures resulting in malfunctioning of PC's. It is therefore essential to meet the Electromagnetic Compatibility (EMC) requirements in addition to other design considerations demanded in a high technology system. The computer is operating and transmitting the signal with low voltage, so it is sensitive to Electromagnetic interference of leakage. Since the PC …
Published in Journal of Power Electronics and Power Systems · Vol. 3, Issue 2, 2013 · pp. 37–40 Read article
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Performance Evaluation of Brushless DC Motor during Sinusoidal and Trapezoidal Back-EMF Waveform
Abstract: Due to increasing popularity and wide application in the drive system BLDC motor is widely used. An undesirable signal in the brushless dc motor is a ripple in torque, which is in challenging motor control and some machine tools. This article represents the performance evolution of BLDC motor by using the sinusoidal and trapezoidal back EMF waveform for getting the efficient operation of BLDC motor drives. In sinusoidal back EMF …
Published in Journal of Power Electronics and Power Systems · Vol. 6, Issue 3, 2016 · pp. 14–22 Read article
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Design and Simulation of Z-Source Inverter Fed Brushless DC Motor Drive Supplied With Fuel Cell for Automotive Applications
Abstract: This paper presents design and simulation of Z-source inverter fed brushless DC motor drive supplied with fuel cell for automotive applications. The brushless DC (BLDC) motor are used due to many advantages such as high efficiency, high torque, high reliability, high-power density, lower maintenance compared to other motors in electric transport applications. The BLDC motor drive is with voltage source inverter (VSI) or current source inverter (CSI) because of low …
Published in Journal of Power Electronics and Power Systems · Vol. 6, Issue 3, 2016 · pp. 60–71 Read article
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Shock Waves in an Electron Depleted Dusty Plasma with Nonextensive Ions
Abstract: A theoretical investigation of dust acoustic shock waves in an electron depleted dusty plasma comprising of negatively charged dust and two temperature non-extensive ions is investigated. The Korteweg-de-Vries Burgers equation is derived with the help of reductive perturbation method. Different physical parameters such as number density of cold ions, non-extensive parameter of cold and hot ions, temperature ratio of cold to hot ions significantly modify the characteristics of dust-acoustic shock …
Published in Journal of Power Electronics and Power Systems · Vol. 10, Issue 1, 2020 · pp. 37–41 Read article
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Methane Recovery From Gas Hydrate By Cool Frack Method
Abstract: Methane in Gas hydrates are the most believed energy source for the future. These are solid crystalline ice with hydrogen bonded water molecules, which traps the guest molecules such as methane, propane, H2S, etc., in its cages. It commonly found in permafrost and deep oceanic sediments and occur in oil and gas pipelines. The extraction of methane from gas hydrates without any geo-hazard and economic efficient is what still a …
Published in Journal of Petroleum Engineering & Technology · Vol. 8, Issue 3, 2018 · pp. 32–39 Read article
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CFD simulation of methane flow through an orifice plate
Abstract: In this paper the effects of errors in the flow rate and discharge coefficient when Methane (CH4) flow through orifice plates with flange tapping has been investigated by the Computational Fluid Dynamics (CFD). The location of vena- contracta was also estimated from CFD simulations. Outcomes of the CFD simulations are in terms of profiles of pressure and velocity. In this study a numerical investigation of the flow characteristics behavior caused …
Published in Journal of Petroleum Engineering & Technology · Vol. 9, Issue 1, 2019 · pp. 1–6 Read article
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High Oil Recovery using Traditional Water-flooding under Compliance of the Planned Development Mode
Abstract: The dynamics and performance of major oil deposits in late (final) stage of development of large oil fields are given the current rates of oil recovery. The high oil recoveries are resulted as a consequence of the favorable geological and physical characteristics of the development objects, application of development systems and optimal density well spacing, adequate geological structure, maintain during the process of the development the optimal rates of technological …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 2, 2016 · pp. 44–49 Read article
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Designing Methodology for Identifying Different Types of Influx Entering in a Well Bore during Drilling and Study of Influx Behavior
Abstract: Drillers frequently encounter kick in drilling operations. Kick refers to the unwanted entry of formation fluid into the well bore. Primary well control and secondary well control are used to control influx entry into a well during drilling operations. Primary well control refers to making the overbalance by the hydrostatic pressure exerted by drilling fluid on the formation pressure. Secondary well control refers to controlling the kick through the use …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 3, 2016 · pp. 7–11 Read article
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Well Injectivity Management during Geological Carbon Sequestration Activity
Abstract: It is well known that the saline aquifer formations are considered very reliable candidates for carbon sequestration because of their wide availability and they have good storage capacity. Due to high formation salinity, there a big concern about bore formation dry-out resulting from the salt precipitation in the form of halite (NaCl). The mutual solubility between CO2 and brine is responsible for creating the salt deposits, this processes may take …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 3, 2016 · pp. 32–43 Read article
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Dodecahedron Methane Hydrate Cage Structure – An Ab initio Study
Abstract: Comparative study of 512clathrate hydrate cage having different numbers of methane guest molecules encapsulation is carried out by calculating interaction energy, encapsulation energy and thermo-chemical stability parameters using density functional theory-based calculation with B3LYP functional and 6-31G(d) basis set. Nuclear magnetic resonance spectroscopy(NMR), Infrared spectroscopy (IR spectroscopy) and Raman spectroscopy of empty and methane encapsulated 512clathrate hydrate cages, change in Gibbs free energy and methane hydrate formation enthalpy are predicted …
Published in Journal of Petroleum Engineering & Technology · Vol. 2, Issue 1-3, 2012 · pp. 51–64 Read article
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Methane Encapsulation in 51264 Clathrate Cage: A Theoretical Study
Abstract: An explicit analysis of 51264 clathrate hydrate cage having different numbers of methane guest molecules encapsulation has been performed depending on calculated interaction energies, encapsulation energies, HOMO-LUMO energies and Raman spectroscopy using density functional theory with B3LYP functional and 6-31G(d) basis set. It is observed from this study that one methane molecule accommodation is most amiable process and theoretically maximum two methane molecules encapsulation is feasible in 51264 clathrate cage …
Published in Journal of Petroleum Engineering & Technology · Vol. 2, Issue 1-3, 2012 · pp. 65–72 Read article
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Solutions to Problems Faced in Well Log Analysis in fractured metamorphic Reservoir Systems Due To Multiple Porosities and Lithology’s
Abstract: Metamorphic rocks are the most bottomless non-terrigenous sedimentary rock and are made essentially out of transformative minerals. Most metamorphic rocks shape from calcareous stores that collect in marine conditions running from salt marshes to reefs to profound sea bowls. Unmistakable and one of a kind parts of transformative rocks are their dominatingly intrabasinal starting point, their essential reliance on natural exercises for their constituents and their powerlessness to change by …
Published in Journal of Petroleum Engineering & Technology · Vol. 9, Issue 1, 2019 · pp. 36–42 Read article
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Polystyrene Plastic Waste into Liquid Fuel Using Silica-Alumina Catalyst, Extracted from Rice Husk
Abstract: Catalytic Pyrolysis of Polystyrene (PS) into fuel like products using silica alumina catalyst that was extracted from rice husk was investigated over temperature range of 430–470°C. The output of catalytic pyrolysis was liquid oil, solid residues (char) and gaseous fraction. The product yields as a function of temperature, time and catalyst amount were studied. High conversion of liquid (48.8%) was achieved at 430 and 450ºC in the presence of 12.5 …
Published in Journal of Petroleum Engineering & Technology · Vol. 10, Issue 3, 2020 · pp. 15–31 Read article
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Diesel Adulteration Detection Using Gaseous Vapor Emission
Abstract: Diesel adulteration is the illegal or unauthorized introduction of foreign substances into pure diesel,causing the product to not conform to the requirements and specifications for use in the Oil and GasIndustry. Current methods to detect diesel adulteration require chemical laboratory experiments tomeasure parameters such as density, API gravity, viscosity, flash point, and evaporation point. Thesemethods require specialized, expensive equipment and cannot be utilized be quickly and readilyemployed at point of …
Published in Journal of Petroleum Engineering & Technology · Vol. 11, Issue 1, 2021 · pp. 69–76 Read article
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Evidence of PDMS-based foam control agent mechanism on crude oil foams
Abstract: Crude oil foam is a frequent problem faced in oil production operations that can cause the reduction of the separator efficiency, separator overflow, carry out of liquid by the gas stream, and other serious problems. Among the techniques used to attenuate foams in crude production, the injection of chemical additives is still considered one of the most efficient. However, the effectiveness of a foam control agent (FCA) is limited to …
Published in Journal of Petroleum Engineering & Technology · Vol. 13, Issue 3, 2023 · pp. 13–23 Read article
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Investigation of Mechanical Properties of Jute and Bamboo Natural Fiber Composites
Abstract: Natural fibers have become increasingly popular in recent decades. Natural fiber composites are also becoming increasingly popular in a various industries, including automobiles, furniture, packaging, construction and sports. Natural fibers have several advantages over synthetic fibers, including low cost, low density, reduced damage to processing equipment, good relative mechanical properties, renewability, and biodegradability. Natural fibers were also introduced with the goal of producing lighter composites, and they have shown a …
Published in Journal of Production Research & Management · Vol. 11, Issue 2, 2021 · pp. 20–33 Read article