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492 articles for “AST”
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Development and Evaluation of Physical and Mechanical Properties on Talc Filled Sisal/Polyester Composites
Abstract: In recent years, research focusing on the use of natural fiber-reinforced composites has been increased and has opened up further industrial possibilities due to advantages of low density, low cost, biodegradability, abundance and renewability proffered by natural fibers. In this research, randomly oriented sisal fiber and talc filler were used to reinforce polyester matrix to produce composites of 3 mm thickness. The composites were fabricated by hand laying technique. Composite …
Published in Emerging Trends in Chemical Engineering · Vol. 5, Issue 2, 2018 · pp. 27–35 Read article
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Production of Particle Board from Cotton Stalk
Abstract: The cotton stalks are normally disposed of by burning, which contributes to the emission of harmful greenhouse gases which pollute the environment. This study used cotton stalk for the production of particle board. The study includes collection and preparation of cotton stalk, analyzing using the ASTM method and its morphological structure, determination of proximity and chemical compositions to compare with hardwood characteristics and production of cotton stalk particle board (CSPB) …
Published in Emerging Trends in Chemical Engineering · Vol. 7, Issue 3, 2020 · pp. 23–33 Read article
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Production of Jatropha curcas L. Seed Oil DMC-Js-BioDs by Optimized Dimethyl Carbonate Using Potassium Hydroxide as Catalyst
Abstract: AbstractThe use of Jatropha curcus L. seed oil as the feedstock for biodiesel (DMC-Js-BioDs) production has observed growing interest because it is a non-edible oil. In this study, the production of DMC-Js-BioDs from J. curcas seed oil with dimethyl carbonate (DMC) as the solvent was performed. The reaction was conducted in the presence of KOH as a catalyst to investigate the optimum conditions and study the effects of the variables …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 8, Issue 2, 2017 · pp. 56–63 Read article
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Synthesis of Biodiesel from Biowaste/Vegetable Oil by Using Heterogeneous Nano-Catalyst
Abstract: This paper presents preparation of heterogeneous nanocatalyst (NaOH/ZnO-Li2CO3) for biodiesel synthesis from biowaste/vegetable oil by transesterification. Transesterification is an important reaction that produces fatty acid methyl esters which are excellent substitutes for diesel fuel. Biodiesel production by using nanocatalyst is one of important approaches in the biofuel research. The optimization of transesterification reaction is affected by the catalyst type, reaction temperature, reaction time, methanol to biowaste/oil ratio. The analysis of …
Published in Journal of Catalyst & Catalysis · Vol. 4, Issue 1, 2017 · pp. 11–23 Read article
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Fire-Mechanical Properties of Geopolymer Concrete
Abstract: Nanoscale Aluminum hydroxide was added in different proportions (10, 15, 20) wt% for Low-calcium fly ash-based geopolymer concrete to increase its resistance to fires. ASTM E84 - 16 standard with 750°C temperature was used to test the ability of aluminum hydroxide to enhance the resistance of concert to burning. The practical results proven the efficiency of aluminum hydroxide as a fire retardant to impede the flame and improved geopolymer compressive …
Published in Journal of Catalyst & Catalysis · Vol. 3, Issue 3, 2016 · pp. 6–9 Read article
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Effect of catalyst and methanol on synthesis of methyl esters from used cooking oil
Abstract: Due to depletion in the fossil fuels and the increase of energy usage, the rapid depletion of fossil fuel is accelerated. Therefore, using renewable energy is a key solution to the problem of fossil fuel depletion. There are several resources of renewable energy like geothermal energy, solar energy, and biofuels. Biodiesel is a fatty acid alkyl ester made from renewable resources such as used cooking oil. The attractiveness of biodiesel …
Published in Journal of Catalyst & Catalysis · Vol. 8, Issue 1, 2021 · pp. 42–51 Read article
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Chemical Composition Quantification of Components in Extracts of Uncaria tomentosa by HPLC and LC-MS Analysis
Abstract: The tropical medicinal vine known as cat's claw, Uncaria tomentosa (Willd. ex Schult.) DC. (Family: Rubiaceae), is native to the Amazon rainforest and other regions of South and Central America. It has been shown to be useful as an immune system booster, antioxidant, antibacterial, and anti-inflammatory agent and has been historically used to treat wounds, fever, urinary tract infections, abscesses, and asthma. U. tomentosa contains a variety of phytoconstituents, including …
Published in Journal of Catalyst & Catalysis · Vol. 10, Issue 1, 2023 · pp. 32–39 Read article
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A Comprehensive Review on Ethnomedicinal Uses of Fishes in Asia
Abstract: In Asia, fish hold a multifaceted role as crucial dietary and economic resources, cultural symbols, and traditional ethnomedicine remedies. With over 4,000 known freshwater and marine fish species in Asian waters, these aquatic creatures feature prominently in the region's diverse ethnomedical traditions. The continent's numerous ethnic groups, each with unique indigenous medical practices, often rely on traditional ethnomedicine due to limited access to modern allopathic healthcare. The paper delves into …
Published in Journal of Catalyst & Catalysis · Vol. 10, Issue 3, 2023 · pp. 24–28 Read article
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Comparison of the Compressive Strength of Concrete Made with Palm Kernel Shell and Gravel as Coarse Aggregates
Abstract: The investigation of alternative materials for the construction, comparison of the compressive strength of concrete made with palm kernel shell as coarse aggregate and concrete made with gravel. A mix proportion of 1:2:4 with water cement ratio of 0.6, ordinary Portland cement, PKS, gravel and sand were used for this research. 24 cubes were cast and tested for compressive strength at 7, A14, 21 and 28 days. The result showed …
Published in Journal of Construction Engineering, Technology & Management · Vol. 12, Issue 1, 2022 · pp. 12–18 Read article
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Review on Replacement of Coarse Aggregate with Palm Kernel Shells: An Environmentally Sustainable Approach
Abstract: The palm shell, extracted from fruit seed can be categorized as a natural lightweight aggregate. To prepare the lightweight aggregates the mass compactness is between 1450 kg m−3 to 1750 kg m−3, which restricted it as low-density concrete. As the curing period of concrete progresses, there is a rise in the strength recognized the strength in the compression results of the cementitious material in 90 days of testing. Referring to …
Published in Journal of Construction Engineering, Technology & Management · Vol. 13, Issue 2, 2023 · pp. 1–6 Read article
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Effect of PWHT Cycle on Microstructure and Mechanical Properties of 1.25Cr-0.5Mo Weld
Abstract: Post Weld Heat Treatment (PWHT) is a process of reducing residual stresses and enhancing material properties of any material after welding. The process depends on many parameters like type of material, the thickness of material, PWHT temperature, soaking time, heating and cooling rate, etc. The Post Weld Heat Treatment process of material could effect on tensile strength, impact toughness, hardness, microstructure, etc. If the Process of PWHT is performed incorrectly …
Published in Journal of Experimental & Applied Mechanics · Vol. 10, Issue 1, 2019 · pp. 7–16 Read article
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Experimental Investigation of Effect of Temperature and Molarity on Compressive Strength of Geopolymer Concrete
Abstract: Geopolymer concrete is a relatively new development in the field of concrete, in which regular Portlandcement is completely replaced with pozzolanic material such as fly ash, which is then activated by astrongly alkaline solution to function as a binder in the mix. As a result, we must manufactureenvironmentally friendly concrete to address issues such as global warming and CO2 emissions intothe atmosphere generated by standard Portland cement production. An experimental …
Published in Journal of Experimental & Applied Mechanics · Vol. 12, Issue 3, 2021 · pp. 34–39 Read article
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Design and Analysis of an Upright
Abstract: An upright also known as a knuckle but upright is an upgraded form of the knuckle. Upright offormula student car is generally subjected to various mechanical loads. Upright isthe part that isconnected with suspension arms, and wheel hub, and is attached to the suspension components. Thehub brake caliper mounting and also the steering tie rod (for front upright) in the FSAE vehicle. Allthe loads that are acting on the wheels …
Published in Journal of Experimental & Applied Mechanics · Vol. 13, Issue 1, 2022 · pp. 1–9 Read article
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Driver Alertness Detection Using Data Correlation
Abstract: AbstractThe number of accidents taking place across the globe is increasing at a fast pace and it's astonishing that around 20% accidents occur due to driver’s fatigue or due to lack of alertness. Non-alertness reduces reaction time and concentration, impairing the ability to execute decision making as well as attention-based activities. Being an aware and responsible citizen, it becomes essential to assure the driver’s vigilance and safety of passengers, co-passengers. …
Published in Journal of Electronic Design Technology · Vol. 10, Issue 2, 2019 · pp. 6–15 Read article
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Low-cost Air Quality Monitoring System for Dhaka City
Abstract: AbstractContamination is the expansion of any substance or any type of vitality to nature at a rate quicker than it very well may be scattered, weakened, deteriorated, reused, or put away in some innocuous structure. Pollution has become a crucial problem for busy cities all around the world. There are many types of pollution among them: air pollution, water pollution, soil pollution, food pollution, noise pollution, light pollution, thermal pollution …
Published in Journal of Electronic Design Technology · Vol. 10, Issue 3, 2019 · pp. 33–41 Read article
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Breakdown Characteristics of Solid Insulating Materials for High Voltage Applications
Abstract: Electrical power systems are experiencing significant changes worldwide both in size and in complexities. Rapid growth of the power sector in the nation provides the opportunity to power engineer to design the power equipment which can with stand the high voltage and also provide reliability during their operating life. As the generating capacity of power plants have increased in recent time, application of high voltage has also intensively increased due …
Published in Journal of Electronic Design Technology · Vol. 6, Issue 3, 2015 · pp. 17–24 Read article
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Design of Low Noise Transimpedance Amplifier using Multiple Feedback filter Topology
Abstract: This study presents the highly linear and low noise transimpedance amplifier (TIA) based on CMOS inverter as an amplifier within multiple feedback (MPFB) filter topology. Absence of complex analog circuitry and compatibility with widespread digital CMOS processes highlight this TIA topology asthe best choice in signal conditioning chains approaching analog-to-digital converters (ADCs). Special attention has been given to the TIA stability and compensation networks. Using dedicated low-dropout (LDO) regulator, the …
Published in Journal of Electronic Design Technology · Vol. 13, Issue 1, 2022 · pp. 25–30 Read article
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Synthesis of a Re-Usable HCl Treated Graphite Catalyst for Biodiesel Production from Pongamia Pinnata Oil and DMC
Abstract: AbstractThe aim of this research was to investigate the biodiesel from Pongamia pinnata oil with HCl treated graphite catalyst via transesterification. New biodiesel formation process was designed using P. pinnata oil and HCl treated graphite catalyst. Graphite powder was treated with HCl and HCl treated graphite was used as a catalyst. 95% biodiesel yield was obtained with operating conditions, including P. pinnata oil to dimethyl carbonate ratio (1:3), catalyst concentration …
Published in Journal of Energy, Environment & Carbon Credits · Vol. 8, Issue 2, 2018 · pp. 30–37 Read article
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Analysis and Evaluation of the Electric Vehicles Carbon Footprint: Application to Environmental Urban Areas
Abstract: This paper analyzes and evaluates the carbon footprint of electric vehicles, Hybrid Electric Vehicle (HEV), Plug-in Hybrid Vehicle (PHEV), and Electric Vehicle (EV). A complete survey of the transformation process of fossil fuels like petrol, gas, or carbon into electricity for the batteries of electric vehicles represents the goal of this work, following the well-known methodology “from well to wheel”. A comparative analysis of urban cars powered by internal combustion …
Published in Journal of Energy, Environment & Carbon Credits · Vol. 13, Issue 2, 2023 · pp. 27–47 Read article
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Probable Causes of Cracks on selected Buildings at Akrowa in Afigya Kwabre District, Ghana
Abstract: This work evaluated the nature of the foundation soils and cracks on twelve representative buildings at Akrowa, in the Afigya Kwabre District near Kumasi in Ghana. Age, material used whether clay/concrete, dimensions of cracks on the buildings and tests for geotechnical parameters of foundation soils such as moisture content, bulk density, specific gravity, particle size distribution, Atterberg limit and direct shear were carried out on soils from four pits dug …
Published in Journal of Geotechnical Engineering · Vol. 10, Issue 3, 2023 · pp. 29–39 Read article