17 results match your criteria: "School of Mechanical and Industrial Engineering[Affiliation]"

The numerous advantages of natural fiber reinforced hybrid composites, such as their light weight, biodegradability, recyclability, availability, and low cost, have brought them to the forefront for various structural applications in the automotive and aerospace industries. Aim of this study was to evaluate the impact of varying the weight fractions of bamboo micro filler on the tensile, flexural, impact, and water absorption properties of the Sisal-Bamboo-E-glass fiber reinforced epoxy matrix hybrid composite prepared by manual hand layup method. To enhance the bond between natural and synthetic fibers and reduce the hydrophilic nature of natural fibers, bamboo and sisal fibers were treated with 5 % NaOH for 6 and 8 h, respectively.

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Article Synopsis
  • The study investigates the potential of using waste from 'khat' plant (Catha edulis) in Hawassa, Ethiopia, to create fuel briquettes.
  • Charcoal fines from khat branches and leaves were combined with clay and molded into briquettes, producing the Carbonized Branch Briquette Charcoal (CBBC), which showed high calorific values and desirable performance.
  • The successful processing of khat waste into CBBC could replace 480 tons of charcoal annually and significantly lower carbon dioxide emissions by about 1,020 tons, while the Carbonized Leaves Briquette Charcoal (CLBC) needs further research due to unsatisfactory results.
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Numerical analysis of fiber reinforced composite material for structural component application.

Heliyon

September 2024

Department of Mechanical Engineering, School of Mechanical and Industrial Engineering, Hachalu Hundessa Campus, Ambo University, P.O. Box 19, Ambo, Ethiopia.

Nowadays, convectional metallic material replaced by composite materials, because composite materials have superior than metallic materials properties such as light weights, higher strength-to-weight ratio, high tensile strength, Low cost, greater design flexibility, better fatigue resistance, renewability, and biodegradability. These properties of composite material are the most basic & common attractive features that make them useful for industrial applications. The main objective of this work is to contribute for a better understanding of the static behavior of structure made from fiber reinforced composite materials, specifically for the case of plate structures.

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Pumps as Turbines (PATs) are known for their ability to replace conventional turbines in Pico/micro-hydropower plants. However, selecting a suitable pump and estimating its performance in reverse mode is a challenging task. The overall efficiency of PATs is also lower when compared to purpose-made turbines.

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Vision Zero for industrial workplace safety innovative model development for metal manufacturing industry.

Heliyon

November 2023

Chair of Industrial Engineering, School of Mechanical and Industrial Engineering, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa, Ethiopia.

This study target is to investigate Vision Zero strategy & develop a model that contributes to the reduction of injuries, accidents, and fatalities. In turn, this model aims to enhance the well-being, safety, and productivity of the manufacturing sector. The study has conducted comprehensive theoretical reviews from reputable journals that are relevant to Vision Zero, manufacturing industries in general, and specifically the metal manufacturing industries.

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Rapid fabrication of micro-nanofibers from grapevine leaf extract and gelatine via electroblowing: A novel approach for edible active food packaging.

Int J Biol Macromol

December 2023

School of Mechanical and Industrial Engineering, Addis Ababa Institute of Technology, Addis Ababa, Ethiopia; Mechanical Engineering Department, Karabuk University, Karabuk, Turkey.

The objective of this study was to develop novel micro-nanofibers for food packaging using grapevine extract (GLP) and gelatine using electroblowing technique. The identified components of GLP were dominated by the flavone group phenolics, as analyzed by LC-MS/MS. SBS was used to fabricate gelatine micro-nanofiber mats loaded with three different concentrations of GLP, which were subsequently cross-linked.

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Assessment of native plants for their potential to remove trace metals around Legadembi tailings dam, Southern Ethiopia.

Environ Sci Pollut Res Int

April 2023

School of Mechanical and Industrial Engineering, Ethiopian Institute of Technology, Mekelle University, Mekelle, Ethiopia.

Native plant species growing on metal contaminated soil at the foot of the Legadembi tailings dam were selected to evaluate their phytoremediation potential. For this purpose, soil, aboveground tissues, and roots of plant samples were analyzed for the concentrations of Zn, Cu, Ni, Pb, and Cd. The bioaccumulation and transfer of metals were evaluated in terms of translocation factor (TF), bioconcentration factor (BCF), and biological accumulation coefficient (BAC).

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Graphene is a promising candidate used to reduce friction and wear in micro- and nano-device applications owing to its superior mechanical robustness and intrinsic lubrication properties. Herein, we report the frictional and wear resistance properties of a graphene-coated polymer and how they are affected by fabrication processes. The results show that graphene deposited on a polymer substrate effectively improves both frictional and wear resistance properties, and the degree of improvement significantly depends on the graphene transfer method and interfacial adhesion between graphene and the substrate.

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Simulation of mixed-mode solar dryer with vertical air distribution channel.

Heliyon

November 2022

School of Mechanical and Industrial Engineering, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa, Ethiopia.

Final quality of product in drying process significantly depends on the flow behavior of drying air. The main drawback of conventional solar dryers is the non-uniformity of air flow inside the drying chamber. The flow behavior of drying air in transient state have been analyzed using Computational Fluid Dynamics (CFD) method.

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Nanofluids are frequently employed in numerous heat transfer applications due to their improved thermophysical properties compared to a base fluid. By selecting suitable combinations of nanoparticles, hybrid nanofluids can have better thermophysical properties than mono nanofluids. Thus, this study examines the effect of volume fractions of hybrid nanofluids on different thermophysical properties, such as density, thermal conductivity, specific heat, and dynamic viscosity.

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Dataset for deformation behavior of pure titanium grade 2 materials during continuous extrusion.

Data Brief

June 2022

Mechanical Engineering Department, School of Mechanical, Chemical and Materials Engineering, Adama Science and Technology University, Adama and 1888, Ethiopia.

There is a huge application and demand for titanium alloys with excellent upgraded mechanical, metallurgical, and material properties in modern industries. To fulfill the demand of modern industries metal forming process is highly desirable. Among all metal forming processes, a special type of cold forming called the continuous extrusion process has been highly appropriate to fulfill the demands.

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Measured solar irradiance data for resource assessment at four sites in Geba catchment, Tigray, North Ethiopia.

Data Brief

February 2022

Thermal and Energy Systems Chair, School of Mechanical and Industrial Engineering, Ethiopian Institute of Technology-Mekelle, Mekelle University, Ethiopia.

Properly recorded solar radiation data are very important in providing accurate information on solar radiation intensity and potential for the application of any solar energy technology. Since such type of data is hardly available in most developing countries like Ethiopia, analysis of temporal and spatial variations of solar radiation is essential for exploring the true potential of a specific area. This scientific data article is, therefore, related to the research work entitled "Temporal and Spatial Solar Resource Variation by Analysis of Measured Irradiance in Geba Catchment, North Ethiopia" (https://doi.

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Hemp Fiber Reinforced Red Mud/Fly Ash Geopolymer Composite Materials: Effect of Fiber Content on Mechanical Strength.

Materials (Basel)

January 2021

Department of Materials Science and Engineering, Institute of Biomaterials, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany.

Novel hemp fiber reinforced geopolymer composites were fabricated. The matrix was a new geopolymer based on a mixture of red mud and fly ash. Chopped, randomly oriented hemp fibers were used as reinforcement.

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A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites.

Materials (Basel)

October 2020

Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany.

The use of ecological materials for building and industrial applications contributes to minimizing the environmental impact of new technologies. In this context, the cement and geopolymer sectors are considering natural fibers as sustainable reinforcement for developing composites. Natural fibers are renewable, biodegradable, and non-toxic, and they exhibit attractive mechanical properties in comparison with their synthetic fiber counterparts.

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Since their debut in 2012, triboelectric nanogenerators (TENGs) have attained high performance in terms of both energy density and instantaneous conversion, reaching up to 500 W m and 85%, respectively, synchronous with multiple energy sources and hybridized designs. Here, a comprehensive review of the design guidelines of TENGs, their performance, and their designs in the context of Internet of Things (IoT) applications is presented. The development stages of TENGs in large-scale self-powered systems and technological applications enabled by harvesting energy from water waves or wind energy sources are also reviewed.

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This study investigated the concurrent accumulation of eight heavy metals by two floating aquatic macrophytes (Lemna minor and Azolla filiculoides) cultivated in ambient media and blended wastewaters in the semiarid regions of Ethiopia. Both species accumulated heavy metals in varying degrees with a significant concentration gradient within the immediate water media. Highest bioconcentration factor (BCF) was determined for Mn and Fe in both plants.

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Modeling the shape hierarchy for visually guided grasping.

Front Comput Neurosci

November 2014

Department of Systems Design Engineering, Centre for Theoretical Neuroscience, University of Waterloo Waterloo, ON, Canada.

The monkey anterior intraparietal area (AIP) encodes visual information about three-dimensional object shape that is used to shape the hand for grasping. We modeled shape tuning in visual AIP neurons and its relationship with curvature and gradient information from the caudal intraparietal area (CIP). The main goal was to gain insight into the kinds of shape parameterizations that can account for AIP tuning and that are consistent with both the inputs to AIP and the role of AIP in grasping.

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