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744 articles for “Densities”
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Performance Analysis of FLC-NR based Loss Minimisation Algorithm for BLDC Motor
Abstract: Brushless DC motors are increasingly used in industry due to their high power density and ease of control. Efficiency of BLDC motor is reduced due to various losses like copper loss, core loss and switching loss. A fuzzy logic based loss minimisation algorithm is described in this study. Selective harmonic elimination-based pulse-width modulation to optimise both the converter switching losses along with machine core and copper losses is done based …
Published in Trends in Electrical Engineering · Vol. 8, Issue 3, 2018 · pp. 51–59 Read article
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Prediction of Transformer Oil Parameters Using UV/VIS Spectroscopy Graphs
Abstract: AbstractUltraviolet–visible rays (UV/VIS) spectroscopy is a method based on a spectrum, which forms a graph between radiations absorbed by the material and the wavelength of the radiations. UV/VIS spectroscopy is able to tell the impurities or decay contents present in any sample material. In this paper, we have used data collected from various tests performed on the transformer oil samples and compared these results with the UV/VIS spectroscopy results. This …
Published in Trends in Electrical Engineering · Vol. 5, Issue 2, 2015 · pp. 35–41 Read article
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Design & Development of Helical Compression Spring Using Composite Material
Abstract: The paper embodies the manufacturing of a helical compression spring using composite material. The main motive for the use of composite material spring is its low density and greater stiffness to that of a steel spring. The composite material spring has greater stiffness to weight ratio as compared to the steel spring. We have manufactured carbon fibre and glass fibre spring using filament winding technique as less as possible economical …
Published in Trends in Mechanical Engineering & Technology · Vol. 10, Issue 3, 2020 · pp. 16–23 Read article
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Passive Capillary Flow of Aqueous Microparticle Suspensions in the Sudden Expansion PMMA Microchannels
Abstract: AbstractAuthor has fabricated a set of sudden expansions micro channels in the polymethylmethacrylate (PMMA) microfluidic devices by the maskless lithography, hot embossing lithography, drilling, air dielectric barrier discharge (DBD) plasma processing, direct bonding technique and chip separation technique. The surface-driven capillary flow of dyed water and three individual aqueous microparticle suspensions are studied with respect to the effects of channel aspect ratio, effective viscosity and surface wettability. The number densities …
Published in Trends in Opto-electro & Optical Communication · Vol. 7, Issue 1, 2017 · pp. 13–17 Read article
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Surface-Driven Capillary Flow of Aqueous Microparticle Suspensions as Working Liquids in the PMMA Microfluidic Devices
Abstract: AbstractPolymethylmethacrylate (PMMA) microfluidic devices have been fabricated by the maskless lithography, hot embossing lithography, drilling and direct bonding technique. The influence of effective viscosity on the speed of surface-driven capillary flow of aqueous microparticle suspensions has been studied. The surface-driven capillary flow of any particular aqueous microparticle suspension is faster in the microchannel of larger channel aspect ratio. Also, the surface-driven suspension flow is faster on the surface of higher …
Published in Trends in Opto-electro & Optical Communication · Vol. 7, Issue 1, 2017 · pp. 18–21 Read article
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Design and Performance Analysis of a 635 nm Ga0.5In0.5P/(Al0.7Ga0.3)0.5In0.5P Multiple Quantum Well Separate Confinement Heterostructure Red Laser Considering Thermal Limitations
Abstract: AbstractIn this work, the performance characteristics of a GaInP - based 635 nm multiple quantum well (MQW) separate confinement heterostructure (SCH) Red laser has been obtained through computations. The material gain of Ga0.5In0.5P/(Al0.5Ga0.5)0.5In0.5P MQW edge emitting laser (EEL) has been theoretically obtained. The peak material gain obtained from the analysis has been used for analyzing the performance of the designed double-heterostructure laser. A maximum output power of 71.18 mW and …
Published in Trends in Opto-electro & Optical Communication · Vol. 3, Issue 1, 2013 · pp. 11–17 Read article
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Optimization of Indium Concentration for Obtaining Enhanced Performance of 980nm InxGa1-xAs/GaAs MQW VCSELs
Abstract: AbstractIn this work, an optimization of Indium concentration of 980 nm InxGa1-xAs/GaAs MQW VCSELs is presented with the aim of improving dynamic performance of the VCSEL. An improved modulation performance is obtained by optimizing Indium concentration of x=0.2. A high modal gain and low transparency carrier density contributes to a high optical output power for In0.2Ga0.8As/GaAs MQW VCSEL. A highest modulation bandwidth of 11.625 GHz is obtained for In0.2Ga0.8As/GaAs MQW …
Published in Trends in Opto-electro & Optical Communication · Vol. 3, Issue 2, 2013 · pp. 14–21 Read article
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Effect of ETL layer thickness on perovskite (CH3NH3PbI3) solar cell
Abstract: Abstract: Thickness of ETL (Electron transport layer) shows important role in term of stability and efficiency of perovskite solar cells. In this paper the numerical simulation and extensive modeling have been performed on perovskite solar cell using perovskite material such as methyl ammonium lead Iodide (MAPbI3, MA=CH3NH3) with the help of SCAPS tool. The electrical properties of the MAPbI3 material used as active layer, have been calculated for different parameter …
Published in Trends in Opto-electro & Optical Communication · Vol. 9, Issue 1, 2019 · pp. 32–37 Read article
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Impact Analysis of Different Active Layer (CH3NH3PbI3) Thickness Using Cu2O as Hole Transport Layer in Perovskite Solar Cell
Abstract: AbstractThickness of active Layer (CH3NH3PbI3) shows important role in term of stability and efficiency of perovskite solar cells. In this paper the numerical simulation and extensive modeling have been performed on perovskite solar cell using perovskite material such as methyl ammonium lead Iodide (MAPbI3, MA=CH3NH3) at different thickness with the help of SCAPS tool. The electrical properties of the MAPbI3 material used as active layer, have been calculated for different …
Published in Trends in Opto-electro & Optical Communication · Vol. 10, Issue 2, 2020 · pp. 15–20 Read article
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A Comparative Analysis of Light Fidelity (Li-Fi) with other communication Mode
Abstract: Li-Fi stands for Light Fidelity. The development is relatively new, and scientists. The portable optical networking system known as Li-Fi uses light emitting diodes (LEDs) to transport data. The term Li-Fi describes the usage of visible light interactions, or VLC, technological advances, which functions much like Wi-Fi in that it makes use of light as an interface to deliver high-speed communication. The focus of this essay is Li-Fi, including its …
Published in Trends in Opto-electro & Optical Communication · Vol. 12, Issue 3, 2022 · pp. 24–30 Read article
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Resilient Characteristics of Modified Subgrade Soil
Abstract: AbstractThe problems with poor subgrade soil which is considered as the foundation for the flexible pavement regarding the deformation under load repetitions is a major concern for road engineers. The Poor subgrade soil may be improved by stabilization or implication of soil reinforcements. In this work, the pneumatic repeated loading testing techniques has been implemented for assessing the influence of both techniques on the resilient characteristics of subgrade soil. Cutback …
Published in Trends in Transport Engineering and Applications · Vol. 4, Issue 3, 2017 · pp. 28–37 Read article
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Experimental Investigation on Utilization of Blast Furnace Slag as Fine Aggregate in Pavement Concrete
Abstract: Concrete is the second largest consumed material by human kind in the world. In this modern era, cement concrete pavements are in demand as compared to bituminous pavements in highway projects. In the recent time, under ages of green technology, the waste utilization in production of concrete especially for pavements is major concern of study. Blast furnace slag is one of the major wastes produced from steel processing plants around …
Published in Trends in Transport Engineering and Applications · Vol. 3, Issue 1, 2016 · pp. 58–64 Read article
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Performance Evaluation of Modified Cold Mix Asphalt by Some Waste Materials
Abstract: The aim of study is to evaluate modified CMA volumetric, mechanical and durability properties by some waste materials. Previous studies described that the mechanical properties of CMA are shown to be influenced by different factors including base bitumen grade, porosity of the mix, curing time and additives. The current research is designed to use the waste and by-product materials as filler to enhance the conventional CMA early age strength. Hence, …
Published in Trends in Transport Engineering and Applications · Vol. 3, Issue 3, 2016 · pp. 33–53 Read article
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Smart Urban Traffic Management System
Abstract: In recent years, the ownership of private vehicles has increased many folds, which is causing difficulty in management of urban traffic. Traffic management is the focus area for most urban dwellers and planners. Some of the main concerns for traffic management of big cities is traffic congestion and avoidance, as these issues cause huge damages on both personal and environmental level. Moreover, in many cities traffic signal lights at crossing …
Published in Trends in Transport Engineering and Applications · Vol. 4, Issue 1, 2017 · pp. 56–65 Read article
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Pedestrian Walking Speed Variation with Width of Stairway in Intercity Railway Stations
Abstract: Rail network being the economical and fast means of transport, many people in the developing countries like India rely on it. Railway stations acts as transfer hubs for passengers to alight and board trains. Unlike metro stations, where daily commuters are more, pedestrian traffic inside intercity railway station is heterogeneous in respect to attributes like age, gender, trip purpose, luggage etc. Pedestrians access various platforms using facilities passageways, stairways and …
Published in Trends in Transport Engineering and Applications · Vol. 6, Issue 3, 2019 · pp. 9–19 Read article
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Experimental Studies on the Use of Local Grinded Aggregate in Enhancing Stability, Reduction of Flow, Air-voids and Deformation of Modified Asphalt Concrete for Medium Collector Roads
Abstract: The adverse environmental impact of man-made and agricultural waste/by-products combined with the rising cost and difficulty in obtaining construction materials have influenced research into better ways to manage these wastes/by-products by incorporating them in asphalt concrete mix design. Different researches have shown that some agricultural waste/by-products can be included as mineral fillers in hot-mix asphalt concrete to obtain certain desirable properties. It is on this basis that this research attempts …
Published in Trends in Transport Engineering and Applications · Vol. 7, Issue 2, 2020 · pp. 1–11 Read article
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Influence of Metakaolin Content on the Properties of Pavement Quality Concrete
Abstract: The use of ordinary portland cement in infrastructure construction needs to be regularized due to sustainability issues. In this regard, there has been an emergence of supplementary cementing materials possessing pozzolanic characteristics. The objective of this paper is to partially replace the cement with metakaolin and investigate the effects of metakaolin on properties of Pavement Quality Concrete. Concrete mixtures with varying MK content of 0%, 5%, 10%, 15%, 20%, and …
Published in Trends in Transport Engineering and Applications · Vol. 8, Issue 2, 2021 · pp. 8–20 Read article
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Influence of Constant Micro Strain Levels on the Strength Properties of the Asphalt Concrete mixture
Abstract: Asphalt concrete mixture is designed to resist the deformation and vehicular traffic loading throughout its service life. However, when the asphalt concrete pavement practices over loading within the service life period, it exhibits cracking and rutting. In the present investigation, an attempt has been taken to understand the strength performance of asphalt concrete when practicing variable levels of constant stresses. Asphalt concrete mixture was prepared at optimum asphalt cement requirement …
Published in Trends in Transport Engineering and Applications · Vol. 10, Issue 3, 2023 · pp. 29–35 Read article
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Optimizing Pervious Concrete Mix Design for Sustainable Urban Pavements
Abstract: This research explores the comprehensive evaluation of pervious concrete, with a focus on sustainability and performance enhancement. It investigates various factors influencing pervious concrete properties, including cement content, aggregate sizes, water-cement ratio (w/c), and the incorporation of chemical admixtures. The study establishes that an optimal cement content range of 350 kg/m3 to 375 kg/m3 is most effective in achieving the desired balance between workability and essential properties. The research also …
Published in Trends in Transport Engineering and Applications · Vol. 10, Issue 2, 2023 · pp. 23–28 Read article
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Mitigation of Mobile Radio Parasitic Radiation Effects: A Review
Abstract: ABSTRACT In this paper, mitigation techniques useful for improving mobile radio systems power efficiency and decreasing electro-smog and specific absorption rate (SAR) induction, affecting human head and body, are presented. An analysis of main radiation effects from far field base stations and review of mitigation techniques for enhancing the efficiency of power transmission for mobile radio systems is shown, followed by an investigation of the complex radiation field components from …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 1, 2012 · pp. 1–12 Read article