Search
1964 articles for “5” (ranking capped at the first 2,000 matches — narrow the search to see the rest)
-
Application of Aqueous Two-Phase Systems in the Extraction of Bovine Serum Albumin
Abstract: Protein partitioning in an aqueous two-phase system (ATPS) has been found to be a powerful method for extracting and separating mixtures of biomolecules. In ATPS, many factors influence the partition coefficient K (which is the ratio of protein concentration in the top phase to that in the bottom phase) and the recovery percent (Rec%). Two systems of ATPS were used: first, polyethylene glycol (PEG4000)/sodium phosphate, and second, PEG4000/dextran. The behavior …
Published in Journal of Polymer & Composites · Vol. 11, Issue 1, 2023 · pp. 41–50 Read article
-
Structural and Electrical Properties of Low-Energy Ion Beam Kr-Irradiated In/Se Bilayer
Abstract: In the present work, In (~50 nm) over Se (~50 nm) thin films were deposited successively on an Si substrate by e-beam evaporation method under 2×10–5 mbar pressure. The In/Se bilayers were irradiated with low-energy ion beams of 350 keV Kr+1 with fluence of 3 × 1016 ions/cm2. The sample was subsequently characterized for phase formation using X-ray diffraction and thickness profile using Rutherford backscattering spectrometry analysis. In the pristine …
Published in Journal of Polymer & Composites · Vol. 11, Issue 1, 2023 · pp. 91–96 Read article
-
Estimation of Mechanical Properties of Kevlar/Basalt Intrawoven Composite Laminates Containing Nanoparticles
Abstract: Purpose: The research describes estimation of various Mechanical properties like compression, tensile, shear and impact strength of Kevlar/Basalt (KB) Intrawoven 1×1 composite laminates, each comprising 1%, 3% and 5% of Al2O3 (Aluminium oxide) nanoparticles. Design/methodology/approach: These are woven with the help of manual handloom weaving machine, compression moulding technique was adopted for the fabrication of hybrid composite laminates. Attempts have been made to analyse the mechanical properties of Kevlar/Basalt intrawoven …
Published in Journal of Polymer & Composites · Vol. 11, Issue 2, 2023 · pp. 1–12 Read article
-
Ameliorating Surface Roughness and Tensile Strength of ASA Fabricated Parts by Analyzing Significant FDM Printing Parameters Using Response Surface Methodology
Abstract: The constantly growing demand for acrylonitrile styrene acrylate (ASA) polymer in the automotive market to its use for fabricating different components such as dashboards, the interior, lights, and electrical components challenges manufacturers to continuously optimize its mechanical properties to meet consumer demand. Despite the widespread availability of three-dimensional (3D) printing techniques, research on the most efficient and cost-effective methods of producing ASA-printed components is still indispensable. Therefore, the purpose of …
Published in Journal of Polymer & Composites · Vol. 11, Issue 3, 2023 · pp. 1–12 Read article
-
Investigation of Mechanical Characteristics of 3D Printed Composite Materials (Polyoxymethylene and Nylon (PA6))
Abstract: Metals and thermosetting polymers are being replaced by 3D printed fiber reinforced composites because of their lightweight construction and mechanical performance. The adoption of 3D printing technology is due to reduced material waste, design freedom, and the ability to construct complicated structures. A technique for additive manufacturing that can create intricately functional parts is fused deposition modeling. The 3D printed nylon fiber reinforced polyoxymethylene samples are fabricated with different proportions …
Published in Journal of Polymer & Composites · Vol. 12, Issue 1, 2024 · pp. 53–64 Read article
-
Investigation of Mechanical Characteristics of 3D Printed Composite Materials (Thermoplastic Urethane and Nylon (PA6))
Abstract: 3D printing has emerged as a game-changer, progressively replacing conventional metals and thermosetting polymers, primarily due to its capacity to create lightweight structures with impressive mechanical attributes. The technology's advantages, such as minimized material wastage, design adaptability, and the ability to craft intricate structures, have propelled its widespread adoption. Within the realm of additive manufacturing, Fused Deposition Modeling (FDM) stands out as a technique capable of producing intricate functional components. …
Published in Journal of Polymer & Composites · Vol. 12, Issue 1, 2024 · pp. 65–76 Read article
-
Biopolymer Substitution and Impact on Cuttings Transport of a Lightweight Water-Based Drilling Fluid
Abstract: The aim is to determine the impact of substitution of a local material for another, on rheological properties and hole cleaning capability. A local biopolymer Mucuna solannie was used as a substitute for another biopolymer, Detarium microcarpum, primarily as a viscosifier in a water-based drilling fluid. Tests were carried out using standard equipment and specifications. Variations in transport efficiency and required minimum fluid flow rate at same cuttings concentration (CC) …
Published in Journal of Petroleum Engineering & Technology · Vol. 7, Issue 2, 2017 · pp. 54–64 Read article
-
Utilization of Egg Yolk as A Non-Toxic Emulsifier in Environmentally Friendly Invert Emulsion Drilling Mud
Abstract: Vegetable oil such as Jatropha has been shown to be a comparable alternative to diesel and mineral oils for environmentally friendly oil based drilling mud. However compatibility of the vegetable oils with the usual chemical additives is still a major challenge that calls for compatible and non-toxic substitutes. This study examined the suitability of hen egg yolk as a non-toxic emulsifier in invert emulsion drilling mud using vegetable oil continuous …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 41–49 Read article
-
The Effects of Dissolved Sodium Chloride (NaCl) on Well Injectivity during CO2 Storage into Saline Aquifers
Abstract: Among different options proposed for carbon dioxide (CO2) storage and sequestration, saline formations seem promising due to their wide availability and potentially large storage capability. As supercritical (SC) CO2 is injected into the formation, a variety of coupled processes takes place. Halite precipitation requires particular interest due to its potentially significant impact on permeability impairment, and thus reduction of injectivity in the near well bore region. The selected candidate for …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 2, 2016 · pp. 11–22 Read article
-
Mud Acid Effect on Fines Migration Problem Using a Newly Developed Al/Zr-Based Clay Stabilizer (A): Mitigation Can Happen
Abstract: Sandstone reservoirs exhibit severe fines migration problems subsequent to conventional mud acid (HCl: HF) treatments. The acid treatment proved to be effective for a relatively short period of time, with a sudden production decline owing to either that mud acid spent rapidly in close proximity to the wellbore, causing clays to migrate into the acidized area and re-plug the formation; or that the mud acid system actually weakens the structure …
Published in Journal of Petroleum Engineering & Technology · Vol. 5, Issue 3, 2015 · pp. 11–29 Read article
-
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
-
New Integral Processes Enrichment of Moroccan Oil Shale using Mineral and Hydrometallurgical Methods
Abstract: In this work, we increase the calorific value of Moroccan oil shale, which is the main element in the combustion of fossil fuels. In particular, we consider the shale of Timahdit, enriching it by hydrometallurgical and mineral processing methods in order to use it to generate thermal and electrical energy. Although different studies have been conducted for the development of Moroccan oil shale, but they have not dealt with the …
Published in Journal of Petroleum Engineering & Technology · Vol. 1, Issue 1-3, 2011 · pp. 28–36 Read article
-
Investigation of the Effects of Solpawa SBR-X TM Doses on Total Petroleum Hydrocarbon in Loam Soil at Different Depths
Abstract: Laboratory trials of environmental remediation products bring the hope of inventing such products to reality for many of today’s intractable environmental pollution conditions, paving the way for the field trials and subsequent large-scale field application. This laboratory study was conducted as the first phase of a 2-tiered adaptive trials of Solpawa® Bioremediation System (Solpawa-SBX) funded by the Nigerian Content Development and Monitoring Board (NCDMB). The study investigated the effectiveness of …
Published in Journal of Petroleum Engineering & Technology · Vol. 13, Issue 1, 2023 · pp. 64–72 Read article
-
Comparison of Physicochemical Concentration on Temperature Effect of Crude Oil Contaminated Water Environment
Abstract: The bio-adsorbents used are plantain stem fiber, banana stem fiber and palm fruit fiber and the investigation was aimed to examiner the effect of temperature on the performance of the bio-adsorbents in a packed bed unit for the mitigation (reduction or removal) of total petroleum hydrocarbon (TPH) from the fresh water medium using agro based fibre, which was prepared by subjecting the agro materials into sun and room dried before …
Published in Journal of Petroleum Engineering & Technology · Vol. 13, Issue 3, 2023 · pp. 1–17 Read article
-
Assessing the State of Readiness in Medium and Large-Scale Industries for Introducing Innovative HR Practices to Catalyze Operational Excellence and Becoming a Cost-Quality Leader
Abstract: Innovative HR practices help company in catalyzing operational excellence and cost quality leader. Through innovative HR practices company can convert its intangible innovative HR practices in to tangible results. Before 5 to 10 years company considered HR department as a nonhju7-productive department; but now a day’s scenario has been changed; now a company considers HR department as the most crucial part of the company. The primary objective of this research …
Published in Journal of Production Research & Management · Vol. 6, Issue 2, 2016 · pp. 54–63 Read article
-
Schmitt-Trigger Based 12T SRAM Cell with Enhanced Stability
Abstract: In this work, we present a single-ended Schmitt-trigger (ST) based 12T static random access memory (SRAM) cell. The proposed cell employs cross-point data aware write structure, and thus supports bit interleaving architecture to mitigate soft errors. The proposed cell does not suffer from read disturbance as bit line is completely isolated from bit storage node. Simulation is done on 180 nm CMOS technology on Cadence. Read static noise margin (RSNM) …
Published in Journal of Semiconductor Devices and Circuits · Vol. 5, Issue 1, 2018 · pp. 5–10 Read article
-
Closed Loop Control of Interleaved Buck Converter with Extremely Low Output Current Ripple
Abstract: AbstractIn this paper, the analysis and modeling of interleaved buck converter with PI controller is discussed. Converters are controlled by two active switches, which have the same switching frequency but 180° out of phase. The loss associated with the power device is half of the input voltage and the duty cycle is below 50%. By paralleling the converters, the input current can be shared among the inductors so that high …
Published in Journal of Semiconductor Devices and Circuits · Vol. 5, Issue 2, 2018 · pp. 9–18 Read article
-
Different Compressor Adders
Abstract: AbstractMultipliers are one of the main blocks which decide the circuit performance as well as computation speed. In multiplication, addition of partial products contributes most to the circuit delay, power, and area. In this project, compressor adders are used to reduce this delay. Hence, compressors are a major part of the multiplier circuit that decides the overall speed of the system. For high-speed processing and higher systems, a huge number …
Published in Journal of Semiconductor Devices and Circuits · Vol. 5, Issue 2, 2018 · pp. 19–26 Read article
-
Electrical Characteristics of AlGaN/GaN/AlGaN HEMTs
Abstract: AbstractA maximum drain current of 556 mA is achieved by the simulated structures of double-heterojunction AlGaN/GaN/AlGaN high electron mobility transistors (HEMTs) using the SILVACO-ATLAS software tool in this work. The drain current is observed as higher at shorter gate length. The drain current is found as higher at larger aluminium mole fraction. Also, the drain current is found as higher at larger thickness of AlGaN barrier layer. The drain current …
Published in Journal of Semiconductor Devices and Circuits · Vol. 5, Issue 3, 2018 · pp. 7–17 Read article
-
Accidental Eccentricity Demand of Educational Building due to Imposed Load Uncertainty
Abstract: AbstractIn this paper, the accidental eccentricity demand of an educational building due to live load uncertainty is worked out. The various occupancies of an educational building are imposed with suitable intensity of imposed load as per IS 875 provision and for different situations of these loads the maximum shift of centre of mass is evaluated. To define imposed load intensity, gamma probability distribution is used. The values of accidental eccentricity …
Published in Journal of Structural Engineering and Management · Vol. 5, Issue 1, 2018 · pp. 1–4 Read article