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1974 articles for “investigations” (ranking capped at the first 2,000 matches — narrow the search to see the rest)
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Radiation Effects in Acrylonitrile (AN) Ethyl Methacrylate Copolymer by Spectroscopic and Thermal Methods
Abstract: Gamma irradiation effects in acrylonitrile (AN) ethyl methacrylate (EMA) (AE) copolymer have been investigated by electron spin resonance (ESR), Fourier transform infrared (FTIR) and differential scanning calorimetric (DSC) techniques. Temperature and radiation dose dependent effects have been investigated by recording ESR spectra under different conditions. Computer simulation techniques are used to analyze ESR spectra to identify of free radical produced on irradiation of copolymer. As such, ESR spectrum of irradiated …
Published in Journal of Polymer & Composites · Vol. 5, Issue 3, 2017 · pp. 22–29 Read article
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Numerical Prediction of Shear Modulus of Multi-Layer PUF Cored Sandwich Composites
Abstract: The present numerical investigation was mainly concerned with the evaluation of apparent shear modulus (Gc) of multi-layered polyurethane foam cored sandwich beams using a novel approach through the medium of general purpose program i.e. FEM/ANSYS. Aiming to the goal, three-point bending analysis was performed on sandwich beam models made up of composite face sheets and multi-layer polyurethane foam cores of different layer densities. Finite element models of sandwich beams were …
Published in Journal of Polymer & Composites · Vol. 5, Issue 3, 2017 · pp. 53–61 Read article
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Adsorption of Methylene Blue Dye from Aqueous Solution Using Polyaniline/Xanthan Gum Nanocomposite: Kinetic and Isotherm Studies
Abstract: ABSTRACTIn the present study, adsorptive properties of polyaniline/xanthan gum nanocomposite were investigated for methylene blue (MB) dye in aqueous solution. The effects of different parameters, namely adsorption time, adsorbent dose, pH and initial dye concentration were on dye adsorption were investigated. The results revealed that a rise se in pH lead to a significant increase in adsorption efficiency. Optimum adsorption time and nanocomposite dose were obtained 60 min and 0.075 …
Published in Journal of Polymer & Composites · Vol. 7, Issue 1, 2019 · pp. 17–26 Read article
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Application of Bloch Analysis to Evaluate Activation of Energy of Irradiated Polyacrylonitrile
Abstract: AbstractPolyacrylonitile is one of the important polymers of technical and scientific importance. During its usage, the polymer is exposed to different types of radiations, limiting its use. In order to investigate the processes involved in radiation effect in PAN, various efforts have been made. In this context, the authors have also made an attempt to investigate radiation induced process in PAN by electron spin resonance (ESR) technique. ESR spectra of …
Published in Journal of Polymer & Composites · Vol. 4, Issue 2, 2016 · pp. 25–28 Read article
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Flexural Characterization of Sandwich Composites; Effect of Varying PU Foam Density and E-Glass Fabric on Flexural Strength
Abstract: AbstractThis paper presents the results of an extensive investigation on flexural behavior and failure mechanisms of sandwich composites with polyurethane (PU) foam core and glass reinforced vinylester as facesheet. The sandwich structures with PU foam of varied density and glass fibres of different architecture are tested under three point bending. The experimental values of face bending strength (FBS) and core shear stress (CSS) are evaluated. Effect of core density and …
Published in Journal of Polymer & Composites · Vol. 2, Issue 2, 2023 · pp. 29–43 Read article
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Effect of High-Shear Mixing on Alignment of Carbon Nanofiber/Epoxy Nanocomposites
Abstract: AbstractOne of the major technological issues limiting widespread use of epoxy polymer nanocomposites containing carbon nanofibers is processability, where the dispersion or alignment of the nanofibers is crucial to performance of the composite. Poor dispersion of the nanofibers can lead to deterioration in properties, while aligning them affords the opportunity to maximize properties in a given direction. The authors have recently investigated the effect of high-shear mixing as a potential …
Published in Journal of Polymer & Composites · Vol. 2, Issue 1, 2023 · pp. 9–18 Read article
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Analysis of Oxidation Behavior on T-22 Boiler steel at 800°C
Abstract: The behavior of boiler steel T-22 in a rich air environment has been studied under the condition of isothermal at 800°C for 50 cycles in a cyclic manner. The kinetics of oxidation was established for boiler steel T-22under cyclic conditions for 50 cycles by weight change technique per unit area. Each cycle heating the sample at 1 hour followed by cooling 20 minutes at ambient temperature. Detonation gun spray techniques …
Published in Journal of Polymer & Composites · Vol. 8, Issue 1, 2020 · pp. 18–25 Read article
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Enhancement in Surface Properties of Magnesium Alloy after Electroless Ternary Alloy Nano Composite Coating
Abstract: AZ91 Magnesium alloys have exceptional rigidity, low density, and electromagnetic protection properties, making them ideal for usage in numerous industrial components. But Magnesium alloys specially AZ91 have a significant disadvantage in terms of corrosion and hardness, which restricts their practical uses. One of the most recent ways for improving the corrosion and hardness of Mg alloys is electro-less nano-coating. This study investigates the hardness and corrosion properties of AZ91 Magnesium …
Published in Journal of Polymer & Composites · Vol. 10, Issue 2, 2022 · pp. 8–13 Read article
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Synthesis and Characterization of Al-Mg-Si Alloy based Hybrid Composite Reinforced with SiC and Graphite
Abstract: The present work is carried out to investigate the mechanical properties of Al-Mg-Si alloy matrix based hybrid metal matrix composites (MMCs) using stir casting method owing to its popularity and large scale productions. SiC and graphite reinforcements were added each with 1%, 2%, 3% and 4% respectively to fabricate four composites specimens. X-ray diffractometer and scanning electron microscope were used for phase identification and microstructure characterization (SEM). Density, hardness, compressive …
Published in Journal of Polymer & Composites · Vol. 10, Issue 3, 2022 · pp. 9–19 Read article
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Influence of FEF (N550) Carbon Black on Rheological and Physico-mechanical Properties of SBR Vulcanizate for Tyre Application
Abstract: This study aims to investigate the synergistic effect of Fast extrusion furnace black on the rheological, surface morphological and physico-mechanical properties such as tensile strength, hardness and specific gravity of styrene-butadiene synthetic rubber composite. SBR is an elastomer which is an important sort of synthetic rubber. It is a copolymer whose molecular structure primarily consists of organic compound styrene and butadiene chain. Fast extrusion furnace black and high abrasion furnace …
Published in Journal of Polymer & Composites · Vol. 10, Issue 3, 2022 · pp. 48–58 Read article
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Effect of Zr, Fe Mono, Bimetallic Nanoparticles on the Electronic Properties of PVA/PVP Polymer blend
Abstract: AbstractThis paper describes the environmentally friendly production of polymer blend nanocomposites (PBNCs) made of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) and embedded with Zirconium(ZrO2), Iron (Fe2O3), and Zirconium-Iron (Zr-Fe), mono and bimetallic nanoparticles (NPs). FTIR spectroscopy was used to investigate the blend's development, interaction between polymers and nanoparticles, interactions between polymers and one another, and the impact of nanoparticles on interactions within PVA/PVP blend nanocomposites. With the addition of nanoparticles …
Published in Journal of Polymer & Composites · Vol. 11, Issue 1, 2023 · pp. 72–80 Read article
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A PWM Based Series Compensator for Power System Performance Enhancement
Abstract: Enhancement of power system stability through a relatively new FACTS device named pulse width modulated series compensator (PWMSC) in the transmission line has been investigated in this article. The three-phase PWMSC is realized with a simple pulse width modulated (PWM) AC link converter consisting of four force-commutated switches and a three-phase diode bridge. The PWMSC is modeled as a continuously controllable series capacitive reactance in the transmission line of a …
Published in Journal of Power Electronics and Power Systems · Vol. 6, Issue 1, 2016 · pp. 12–25 Read article
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Impact of Time Multiplier Setting Range on Optimum Coordination of Directional Overcurrent Relays
Abstract: Over-current relays especially Inverse Definite Minimum Time (IDMT) relays are most commonly used protective device in the distribution system. It is vital that during abnormalities or faults, the IDMT relays must be capable to isolate only the faulty part of power system from the healthy system. The operating time of IDMT relays can be reduced with proper coordination between primary and backup relays by selecting optimum settings. Heuristic-based optimization techniques …
Published in Journal of Power Electronics and Power Systems · Vol. 4, Issue 3, 2014 · pp. 33–40 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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Production of Cellulosic Ethanol from Wood Sawdust by Sulphuric acid Hydrolysis
Abstract: In this study, production of cellulosic ethanol from wood sawdust was investigated. Four experimental parameters were investigated during the hydrolysis and ethanol production. These are particle size (1–3 mm), acid concentration (3–7%), temperature (90–110°C), and time(120–240 min). The total reduced sugar content and ethanol yield was determined. Response surface methodology (RSM) employing the central composite design (CCD) was used to optimize the total reduced sugar and ethanol yield. Cite this …
Published in Journal of Petroleum Engineering & Technology · Vol. 7, Issue 3, 2017 · pp. 30–35 Read article
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A Potential Evaluation and Pilot Test of CO2 Miscible Injection in Daqing, China
Abstract: The paper introduces the entire process for a CO2 injection in the Fang-48 Group, Daqing Oilfield. A study using experiment and full-field reservoir modeling investigated and optimized the design of a CO2 miscible flooding project for Fang-48 Group, Daqing. The study began with extensive data gathering in the field and building a full-field three-dimensional geologic model. A full-field simulation model with relatively coarse gridding was subsequently built and used to …
Published in Journal of Petroleum Engineering & Technology · Vol. 3, Issue 1, 2013 · pp. 8–13 Read article
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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
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Evaluation of Existing Maintenance Management Scenario of Indian SMEs to Address the Difficulties and Critical Parameters
Abstract: Indian small and medium enterprises need to build and maintain competitiveness against the challenges posed by globalization. To achieve a sustainable growth, the ministry of MSME, government of India has launched lean manufacturing competiveness scheme (LMCS). Under it, a cluster of 8 to10 MSMEs are formed to implement various lean principles. National Productivity Council has reported only 58% success rate for pilot phase implementations but on the ground, the sustention …
Published in Journal of Production Research & Management · Vol. 7, Issue 2, 2017 · pp. 17–28 Read article
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Study and Analyze the Importance of Leadership in Modern Business
Abstract: The beginning point for this chapter was to bring together the investigation regions of organizationalstandards, innovation and alter, and information operation. The center was on innovation from the pointof view of organizational ponders and the method of information sharing in affiliations. It too incorporatesthe conception that specific information is a critical source of organizational information and investigatesthe interface between specific information utilized and organizational innovation forms. In spite of the …
Published in Journal of Production Research & Management · Vol. 12, Issue 2, 2022 · pp. 8–15 Read article
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Novel Characteristics of GaN based Nanoelectronic Double-Heterojunction HEMTs to Establish a Solid-State-Electronics Laboratory
Abstract: The drain characteristics are investigated with respect to electrical variables (drain voltage, gate voltage) and structural parameters of high electron mobility transistors (HEMTs). Total 10526 individual simulation-outputs are reported in this work. The maximum drain current of 553 mA is achieved by the simulated structures of double-heterojunction HEMTs using the SILVACO-ATLAS software tool. The drain current is higher at shorter gate length. The drain current is higher at larger aluminium …
Published in Journal of Semiconductor Devices and Circuits · Vol. 4, Issue 3, 2017 · pp. 11–20 Read article