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44 articles for “bottom-up design”
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Improved Performance Characteristics of a Designed 1050 nm Bottom Emitting MQW VCSEL using Al0.25Ga0.22In0.53As/InP Materials
Abstract: AbstractIn this work, the design and performance characteristics of a bottom emitting Al0.25Ga0.22In0.53As/InP Multi-Quantum Well (MQW) Vertical-Cavity Surface-Emitting Lasers (VCSEL) have been presented for operation at a wavelength of 1050 nm. The transparency carrier density and bandgap energy of the QW and barrier materials are computed. An improved performance of the designed VCSEL has been obtained by selecting a material with high gain and lower transparency carrier density in the …
Published in Trends in Opto-electro & Optical Communication · Vol. 3, Issue 3, 2013 · pp. 22–30 Read article
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Design and Performance Considerations for Buildings in Coastal and Offshore Environments
Abstract: Buildings near coastal and offshore regions are exposed to extreme wind and seismic forces that govern structural design. In this study, a simplified assessment of wind and earthquake loads acting on a multistorey coastal building is presented. A wind velocity of 400 km/hr. is considered to represent severe cyclonic conditions. Using a unit weight of air of 12 N/m³, the cumulative wind thrust acting over a building height of 40 …
Published in Journal of Offshore Structure and Technology · Vol. 13, Issue 1, 2026 · pp. 13–21 Read article
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Cloud Computing and Storage Issues
Abstract: This paper talks over security issues for cloud computing & presents a layered framework for secure clouds and then focus on layers, i.e., the storage layer & the data layer. Cloud computing is a set of IT facilities that are as long as to a customer over a network on adhoc basis and with the ability to scale up or down their service requirements. Generally cloud computing services are distributed …
Published in Recent Trends in Programming languages · Vol. 1, Issue 2, 2014 · pp. 20–26 Read article
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Review on Double Girder Bottom Pulley Hook Block for EOT Crane
Abstract: The design of crane is under the standard IS 3177 for steel plants and IS 4137 for power plants crane. Classification of crane is based on operating cycle or working cycle of crane as per IS 13834. In which the maximum and heavy duty working cycle of crane is considered as steel plant crane. Electric overhead cranes (EOT) are widely used as material handling equipment in industries. Among all its …
Published in Trends in Mechanical Engineering & Technology · Vol. 5, Issue 2, 2015 · pp. 49–55 Read article
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Deformation Behaviour of the Billet and Tooling Design on AA5083 through Equal Channel Angular Pressing With Effect of Back Pressure
Abstract: Equal channel angular pressing is an emerging method applied to subject materials to significant plastic strains while maintaining the original shape of the billet. Researchers have discovered that the level of strain attained through equal channel angular pressing is influenced by factors such as the angle of die, friction conditions, and the implementation of back pressure. These variables significantly impact the microstructure and the irregularity of strain within the billet …
Published in Journal of Polymer & Composites · Vol. 12, Issue 1, 2024 · pp. 287–303 Read article
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A New Developed Photoelectrochemical Cell for Hydrogen Generation
Abstract: There are many methods for the industrial production of hydrogen, including: steam reforming of methane and natural gas; coal gasification; biotechnology; electrolysis of water, etc. The most effective method of obtaining of pure hydrogen is the use of photoelectrochemical cell. Photoelectrochemical cells produces hydrogen directly from solar energy. In a photoelectrochemical cell, a silicon semiconductor with an anode attached to it, immersed in an aqueous electrolyte solution and excited by …
Published in International Journal of Photochemistry and Photochemical Research · Vol. 1, Issue 1, 2023 · pp. 01–10 Read article
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Numerical Simulation-based Comparative Study of P3HT-based Top Contact and Bottom Contact OTFTs
Abstract: AbstractIn this paper presents numerical simulation-based comparative study of bottom and top contact configurations of P3HT based organic thin-film transistor (OTFT). I-V characteristics has been evaluated using the TCAD simulator and comparison of the performance parameters of these devices has been presented. The dimensions of the transistors for all the proposed structures are kept the same for a valid comparison between them. The observed results were explained based on the …
Published in Journal of Electronic Design Technology · Vol. 10, Issue 3, 2019 · pp. 27–32 Read article
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Design and Analysis of Dual Band Triangular Slotted Microstrip Patch Antenna for GPS and WLAN Application
Abstract: AbstractIn this paper, design of a dual operated microstrip patch antenna is presents. The dual-operation frequencies are chosen for UMTS/GPS and WLAN bands. A microstrip square patch antenna is designed which is excited by a microstrip line feed from the bottom of the antenna. An epoxy glass FR4 material is used as a substrate in the designing of antenna. The antenna is first modified in inverted U-shaped design to operate …
Published in Journal of Microwave Engineering and Technologies · Vol. 6, Issue 2, 2019 · pp. 1–5 Read article
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History and Development of Design of Regime Channels: A State of the Art Review
Abstract: Channels carrying sediment laden water and constructed in erodible alluvial materials must be designed to be silt stable or in regime such canals by definition neither scour nor silt. The design of channel involves the selection of channel alignment, shape, size and bottom slope. In general, a channel changesincessantly in its position, shape and slope, as a consequence of hydraulic forces acting on its bed and banks. The design of …
Published in Journal of Structural Engineering and Management · Vol. 1, Issue 1, 2014 · pp. 7–15 Read article
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First experimental results on “clay and bentonite” mixtures for the waterproofing of a landfill in Northwestern Piedmont Region (NW Italy)
Abstract: We report on experimental results conducted on “clay and bentonite” mixtures for the waterproofing of a tank landfill located in Northwestern Piedmont Region (NW Italy).The geotechnical experimental tests on “clay and bentonite” mixtures were conducted in the laboratory first, with the aim of finding the optimum percentage of granular bentonite to be added to the clay and then, they were carried out in situ, in the tank, on the layer …
Published in Journal of Geotechnical Engineering · Vol. 7, Issue 2, 2020 · pp. 13–17 Read article
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Smart Blind Stick
Abstract: In accordance to World Health Organization statics, 253 million people are currently living with vision impairment, 36 million of which are blind, and 217 million who have moderate severe vision impairment. Mostly people aged 50 and above are blind as WHO estimated that 81% of the blind population are adult peoples. Due to a variety of factors, number of visually impaired persons is anticipated to rise in the future. As …
Published in Journal of Semiconductor Devices and Circuits · Vol. 8, Issue 3, 2021 · pp. 23–46 Read article
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Perovskite-Silicon Thin Film Based Tandem Solar Cell
Abstract: A perovskite-microcrystalline silicon-based thin-film tandem solar cell was designed and investigated, where perovskite and microcrystalline cells used as top and bottom cells, respectively, for better and higher light absorption utilizing the very high open-circuit voltage. The study was carried out for simulation results of quantum efficiency and short circuit current based on different thicknesses of the top and bottom cell-intrinsic layer. A very good short circuit matched current has been …
Published in Nano Trends – A Journal of Nano Technology & Its Applications · Vol. 22, Issue 2, 2020 · pp. 23–29 Read article
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Effect of Outriggers Location on Performance of RC Building Subjected to Loss of a Column
Abstract: Progressive collapse denotes a failure of substantial part of the structure, causing greater damage to the structure than the initial impact, which has been initiated by failure of a relatively small part of the structure such as failure of any vertical load carrying elements (typically columns). Failure of large part of any structure will result into substantial loss of human lives and natural resources. Therefore, it is important to prevent …
Published in Journal of Structural Engineering and Management · Vol. 4, Issue 1, 2017 · pp. 65–72 Read article
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Examining and Evaluating Important Methods for Marine Sediment Collection
Abstract: In marine scientific research, sediment is extremely important for marine geology and microbial communities. The scientific research findings are related to the in-situ information of the sediment samples that are collected from the sea bed. Van Veen grab samplers (VVG) are designed for obtaining sediment and become indispensable scientific equipment. The sediment grab sampler should be lightweight, compact easy to handle for operation and high adaptability to extreme sea conditions. …
Published in Journal of Offshore Structure and Technology · Vol. 10, Issue 3, 2023 · pp. 31–36 Read article
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Effect of the Position of Geotextile on the Performance Parameters of the Flexible Pavement
Abstract: The major deterioration of the flexible pavement is due to the combined effect of fatigue cracking caused by excessive horizontal strain at the bottom of the bituminous layer and rutting deformation caused by excessive vertical strain at the top of subgrade layer. For designing the flexible pavement, it is necessary to determine the minimum thickness of the road crust, required to withstand the expected fatigue life and rutting life. The …
Published in Trends in Transport Engineering and Applications · Vol. 3, Issue 2, 2016 · pp. 65–75 Read article
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T-Shape Antenna with Defected Ground for 5G Applications
Abstract: In this paper, for 5G cellular applications, a novel microstrip patch antenna with high gain and wide bandwidth MMW frequencies is presented. The antenna is designed as single T-shaped radiating patch on the top layer of substrate and for improving the bandwidth and return loss characteristics, partial ground is incorporated on the bottom plane. A 50Ω matched lumped port is used for the feeding. In addition, the proposed antenna is …
Published in Journal of Mobile Computing, Communications & Mobile Networks · Vol. 6, Issue 1, 2019 · pp. 23–27 Read article
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Eye Shaped MIMO Antenna for Ultrawideband Applications
Abstract: AbstractA totally distinctive MIMO sharp band-notched antenna with high isolation for UWB applications is given. The antenna consists of two antenna elements with an overall space. A shaped stub is extruded among the bottom plane to enhance isolation associated with a shaped stub to introduce band-notched. The designed antenna possesses an occasional mutual coupling over the operative band. The performance of this antenna is studied in terms of isolation between …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 5, Issue 2, 2018 · pp. 25–29 Read article
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Managing Blow-by in Modern Engines: A Comprehensive Review of Crankcase Ventilation Technologies
Abstract: Blow-by in internal combustion (IC) engines occurs when high-pressure combustion gases escape past the piston rings into the crankcase. These gases typically carry oil aerosols, unburned hydrocarbons, and fine particulate matter, which, if not effectively managed, can disrupt lubrication, accelerate component wear, and contribute to harmful emissions. Effective crankcase ventilation is therefore essential not only for ensuring engine durability but also for meeting increasingly stringent emission regulations. This paper examines …
Published in Journal of Polymer & Composites · Vol. 14, Issue 1, 2026 · pp. 317–324 Read article
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Experimental Study of Flexural Behavior of High Strength Concrete
Abstract: Flexural test results generated on nine reinforced concrete beams to evaluate the implications of using high-strength concrete (HSC) are reported. The stress block parameters on the current IS456-2000 code are limited to concrete strength up to 55 MPa. This paper looks at the applicability of IS456-2000 stress block parameters for HSC beyond the scope of code IS456-2000. Particular emphasis has been given to the issues of maximum compressive strain, ultimate …
Published in Journal of Structural Engineering and Management · Vol. 6, Issue 2, 2019 · pp. 19–23 Read article
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A New Developed Hydrogen Generator for Hydrogen Electric Vehicle
Abstract: Hydrogen practically does not occur in its pure form on Earth and must be extracted from other compounds using various chemical methods. There are currently many methods of industrial hydrogen production, which include: steam reforming of methane and natural gas; coal gasification; biotechnology; water electrolysis. Hydrogen production by water electrolysis has a number of advantages over other methods, including: availability of available raw materials (water); a wide range of hourly …
Published in Recent Trends in Fluid Mechanics · Vol. 10, Issue 1, 2023 · pp. 1–13 Read article