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4th International Conference on Advanced Technology and Applied Sciences, ICaTAS 2019

作者： Khairuddin, U. Razi, N.A.Z.M. Abidin, M.S.Z. Yusof, R. Department of Mechanical Precision Engineering Malaysia-Japan International Institute of Technology Universiti Teknologi Malaysia Kuala Lumpur54100 Malaysia Department of Information Systems Faculty of Computer and Mathematical Sciences Universiti Teknologi MARA Selangor Shah Alam42300 Malaysia Centre for Artificial Intelligence and Robotics Malaysia-Japan International Institute of Technology Universiti Teknologi Malaysia Kuala Lumpur54100 Malaysia

Every year, at least 100 million tons of solid waste globally comes from packaging waste, in which partly created by inefficient packaging. Multiple box arrangement or bin packing solution directly addresses this problem which also affects storing space in production, manufacturing and logistics sector. Smart packing algorithm is designed for solving three-dimensional bin/container packing problem (3DBPP) which has numerous practical applications in various fields including container ship loading, pallet loading, plane cargo, warehouse management and parcel packing. This project investigates the implementation of genetic algorithm (GA) for a smart packing simulator in solving the 3DBPP applications. The smart packing system has an adaptable chromosome length GA for more robust implementation, where chromosome length will be changing with number of boxes. It can optimize multiple box arrangements and the boxes movements and positions are simulated through each GA generations, for realistic adaptation. The system is able to make optimum arrangement for the boxes so they can fit into a smallest container possible. The time taken for GA to converge varies with number of boxes. © Published under licence by IOP Publishing Ltd.

关键词： Genetic algorithms

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Energy Dissipation of Ship Structures subjected to Impact Loading: A Study Case in Side Collision

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Procedia Structural Integrity 2020年 27卷 171-178页

作者： Aditya Rio Prabowo Haris Nubli Jung Min Sohn Department of Mechanical Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan 48513 South Korea Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan 48513 South Korea

The main goal of the present paper is to study the energy dissipation characteristic as the influence of parameters in the event of ship collisions. The review is conducted on accident case between Roll on-Roll off (Ro-Ro) Marisa Nusantara with Reefer Qi Hang at Sunda Strait, Indonesia May 3rd, 2014, as reference. It was later modeled and analyzed by nonlinear simulations finite element (FE) method was presented to be used as a reference to get the verified model. This collaboration study is considered as a good reference because it used real accident damage to compare the numerical results. The result in collision energy from the virtual simulation was later verified with the calculation result of the empirical formula. In the extended study, the collision region and material model are selected as influenced parameters to design collision scenarios. The characteristic of collision energy from these scenarios will be discussed. In the same section, the damage pattern is observed and reviewed to find the relation between several parameters to calculation results. It was shown that the influence of region and location of target points contributed significantly to energy dissipation. In contrast, the key finding in material properties is that when Young’s modulus between materials was the same and the difference of yield strength of materials was not significant, then other material properties contributed to the result.

关键词： Accidental loads ship collision Ro-Ro vessel double-hull structures crashworthiness energy dissipation

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Boosted Wound Healing and Anticancer Potential of Polymer Functionalized Cerium Oxide Nanomaterials

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Journal of Trace Elements in Medicine and Biology 2025年

作者： Muhammad Khawar Abbas Yasir Javed Naveed Akhtar Shad Azhar Rasul Amna Bashir Syed Fazil Bin Farukh Heba Taha Abdulghani Wasim Abbas Aisha Sethi Muhammad Ramzan Khawar Dongwhi Choi Department of Physics Government College University Faisalabad Pakistan Department of Physics University of Agriculture Faisalabad Pakistan National Institute for Biotechnology & Genetic Engineering Jhang Road Faisalabad Pakistan Department of Zoology Government College University Faisalabad Pakistan Department of Exercise Physiology College of Sports Sciences and Physical Activity King Saud University Riyadh 11451 Saudi Arabia Division of Health Biotechnology National Institute for Biotechnology & Genetic Engineering (NIBGE) Faisalabad Pakistan Department of Pharmaceutics Faculty of Pharmaceutical Sciences. Government College University Faisalabad Pakistan Department of Mechanical Engineering (Integrated Engineering Program) Kyung Hee University Yongin Gyeonggi 17104 Republic of Korea

Background Wound recovery is an important part of treatment to prevent internal organelles from possible exposure to outer pathogens. In recent years, different therapies have been reported to enhance the natural wound healing process with faster and more effective tissue repair. Method The hydrothermal method has been endeavored to synthesize eco-friendly and cost-effective polymer (polyethylene glycol (PEG) and chitosan) functionalized cerium oxide nanoparticles (CeO 2 NPs). Wound healing potential was studied on Chorioallantoic Membrane Assay and G. domesticus wheras anticancer studies were conducted against HuH-7.0 (hepatic cancer cell line). Results Wound healing properties are studied initially through CAM assay which shows vein growth with chitosan-functionalized CeO 2 NPs. The topical wound healing studies on G. domesticus show speedy recovery and quicker completion of the skin remodeling phase, observed through the quality of the recovered skin. Additionally, PEGylation has promoted the anticancer potential of CeO 2 NPs against HuH-7.0 (hepatic cancer cell line) and the IC 50 value is 37.89 μg/mL. Conclusion The results show that PEG and chitosan coating have enhanced the therapeutic prospects of CeO 2 NPs.

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Energy Efficiency Analysis in a Textile Company Using DMAIC Approach

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IOP Conference Series: Materials Science and engineering 2021年第1期1096卷

作者： S Sakti B M Sopha E S T Saputra Industrial Engineering Program Department of Mechanical and Industrial Engineering Universitas Gadjah Mada (UGM) Yogyakarta Indonesia

Textile industries generally consume a significant amount of electricity in their business operations, hence, efforts to reduce their consumption is necessary. This study assesses the energy consumption and energy saving opportunities in a textile company in Indonesia. A structured energy audit using Define-Measure-Analyze-Improve-Control (DMAIC) was implemented in the Spinning department. The evaluation indicates that 80% of the Specific Energy Consumption (SEC) are dominated by the factory air conditioner and chiller which is corresponding to 515 kWh/kg and 219 kWh/kg respectively. The Coefficient of Performance (COP) of the plant cooling system is 7.41 which conforms to the COP national standard. Further energy-saving opportunities include closing the door and other gateways of the air, replacing the refrigerant material from Freon R-134 to Musicool Mc-134, and installing inverter on mist nozzle motor, evaporator pump, condenser pump, and cooling tower.

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A self-standing,UV-cured semi-interpenetrating polymer network reinforced composite gel electrolytes for dendrite-suppressing lithium ion batteries

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Journal of Materiomics 2019年第2期5卷 185-194页

作者： Ruiping Liu Zirui Wu Peng He Haoyu Fan Zeya Huang Lei Zhang Xinshuang Chang Hang Liu Chang-an Wang Yutao Li Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine ProcessingTsinghua UniversityBeijing 100084China Department of Mechanical Engineering University of Alaska FairbanksFairbanksAK 99775United States Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinTexas78712United States

A self-standing,flexible and lithium dendrite growth-suppressing composite gel polymer electrolyte membrane was designed for the use of room-temperature lithium ion *** multi-functional composite semi-interpenetrating polymer network(referred to as“Cs-IPN”)electrolyte membrane was fabricated by combining a UV-cured ethoxylated trimethylolpropane triacrylate(ETPTA)macromer with alumina nanoparticles in the presence of liquid electrolyte and thermoplastic linear poly(ethylene oxide)(PEO).The polymer electrolyte membrane exhibits a semi-interpenetrating polymer network structure and a higher room temperature ionic conductivity,which impart the electrolyte with a significant cycling(120 mAh g^(-1)after 200 cycles)and a remarkable rate(137 mAh g^(-1)at 0.1℃,130 mAh g^(-1)at 0.5℃,119 mAh g^(-1)at 1℃ and 100 mAh g^(-1)at 2℃)performance in Li/LiFePO4 *** importantly,the polymer electrolyte possesses superior ability to inhibit the growth of lithium dendrites,which makes it promising for next generation lithium ion batteries.

关键词： Gel polymer electrolytes Semi-interpenetrating polymer network UV-Cured reaction Ionic conductivity Lithium ion batteries

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A self-sustaining process theory for uniform momentum zones and internal shear layers in high Reynolds number shear flows

arXiv

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arXiv 2020年

作者： Montemuro, Brandon White, Christopher M. Klewicki, Joseph C. Chini, Gregory P. Program in Integrated Applied Mathematics University of New Hampshire DurhamNH03824 United States Department of Mechanical Engineering University of New Hampshire DurhamNH03824 United States Department of Mechanical Engineering University of Melbourne MelbourneVIC3010 Australia

Many exact coherent states (ECS) arising in wall-bounded shear flows have an asymptotic structure at extreme Reynolds number Re in which the effective Reynolds number governing the streak and roll dynamics is O(1). Consequently, these viscous ECS are not suitable candidates for quasi-coherent structures away from the wall that necessarily are inviscid in the mean. Specifically, viscous ECS cannot account for the singular nature of the inertial domain, where the flow self-organizes into uniform momentum zones (UMZs) separated by internal shear layers and the instantaneous streamwise velocity develops a staircase-like profile. In this investigation, a large-Re asymptotic analysis is performed to explore the potential for a three-dimensional, short streamwise- and spanwise-wavelength instability of the embedded shear layers to sustain a spatially-distributed array of much larger-scale, effectively inviscid streamwise roll motions. In contrast to other self-sustaining process theories, the rolls are sufficiently strong to differentially homogenize the background shear flow, thereby providing a mechanistic explanation for the formation and maintenance of UMZs and interlaced shear layers that respects the leading-order balance structure of the mean dynamics. Copyright © 2020, The Authors. All rights reserved.

关键词： Shear flow

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ASPEN Plus simulation of palm kernel shells, waste shiitake substrate, and sewage sludge co-gasification

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Energy 2025年 329卷

作者： Guan-Bang Chen Yun-Ting Hsu Department of Aeronautics and Astronautics National Cheng Kung University Tainan 701 Taiwan ROC International Degree Program on Energy Engineering National Cheng Kung University Tainan 701 Taiwan ROC Research Center for Energy Technology and Strategy National Cheng Kung University Tainan 701 Taiwan ROC Department of Mechanical Engineering National Cheng Kung University Tainan 701 Taiwan ROC

An ASPEN Plus model, incorporating a kinetic model that includes tar cracking, was developed to simulate the co-gasification of palm kernel shells (PKS), waste shiitake substrates, and sewage sludge (SS). Different treatment methods were applied during the pyrolysis stage for various feedstocks. A comprehensive parameter analysis was conducted and the parameters included gasification temperature, feedstock blending ratio (BR), gasifying agent mixing ratio (MR), and equivalence ratio (ER). In PKS and SS co-gasification, BR and ER had the most significant impact on CO production, while MR and BR were key for H 2 and CH 4 yields. SS gasification performed optimally at low ER (0.1), while PKS preferred ER 0.3. The highest H 2 yield was 0.0032 kg/h, CO 0.1171 kg/h, and the optimal H 2 /CO ratio of 0.89 occurred at 800 °C, SS feed, pure steam, and ER 0.4. In shiitake substrate and SS co-gasification, BR influenced syngas components, with higher ratios reducing CO, H 2 , and CH 4 yields. The optimal ER for CH 4 and CO production was 0.2, and the highest H 2 /CO ratio (2.47) occurred at 900 °C, pure SS, 60 % steam/40 % CO 2 , and ER 0.4. Shiitake gasification produced the highest CO and H 2 , while SS had the highest H 2 /CO ratio.

关键词： Palm kernel shells Waste shiitake substrate Sewage sludge Co-gasification Bubbling fluidized-bed gasifier ASPEN Plus

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Alcocrcu0.5feni High-Entropy Alloy Samples Fabricated by Laser Powder Bed Fusion

SSRN

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SSRN 2022年

作者： Andreoli, Angelo F. Noaimy, Omar Al AlMangour, Bandar He, Tianbing Batalha, Rodolfo Lisboa IFW Dresden Institute for Complex Materials Helmholtzstraße 20 Dresden01069 Germany Department of Mechanical Engineering King Fahd University of Petroleum & Minerals Dhahran31261 Saudi Arabia Interdisciplinary Research Center for Intelligent Manufacturing & Robotics King Fahd University of Petroleum & Minerals Dhahran31261 Saudi Arabia Materials and Technologies Department of Research Development and Innovation Instituto de Soldadura e Qualidade Avenida Professor Dr. Cavaco Silva 33 Taguspark Porto Salvo Oeiras2740-120 Portugal

This study aimed to determine the printability of the AlCoCrCu 0.5 FeNi high-entropy alloy produced by laser powder bed fusion (LPBF) and evaluate the degree of densification, microstructural evolution, and mechanical behavior of as-printed samples. It was found that the powders exhibited a body-centered cubic BCC/B2 crystal structure. For the LPBF-processed samples besides the BCC/B2 structure the face-centered cubic (FCC) phase is present. The LPBF-processed samples suffered from extensive solidification cracks, mainly in the building direction, that may have been induced by the BCC/B2 solid-state spinodal decomposition and/or residual stresses accumulated during building, although the samples show good compressive strength. © 2022, The Authors. All rights reserved.

关键词： Entropy

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Design of A Multi-Functional Soft Ankle Exoskeleton for Foot-Drop Prevention, Propulsion Assistance, and Inversion/Eversion Stabilization

Design of A Multi-Functional Soft Ankle Exoskeleton for Foot...

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IEEE/RAS-EMBS International Conference on Biomedical robotics and Biomechatronics (BioRob)

作者： Haisheng Xia Junghan Kwon Prabhat Pathak Jooeun Ahn Peter B. Shull Yong-Lae Park State Key Laboratory of Mechanical Systems and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China Department of Mechanical Engineering Soft Robotics Research Center (SRRC) the Institute of Advanced Machines and Design (IAMD) Seoul National University Seoul South Korea Department of Physical Education Seoul National University Seoul South Korea

ISBN: (数字)9781728159072

ISBN: (纸本)9781728159089

Stroke often results in hemiplegia, which greatly affects the walking ability of the patients. We propose a multi-functional portable ankle exoskeleton for use in preventing foot-drops, assisting propulsion, and stabilizing inversion/eversion during walking to help gait rehabilitation of stroke patients. The portable ankle exoskeleton was fabricated by 3D printing a soft/rigid hybrid structure. The device was able to prevent foot-drop and assist propulsion with a bi-directional cable-driven actuation system. It also showed a capability of stabilizing inversion/eversion motions using a counter-electromotive force of two small, lightweight gear motors. The device was controlled by a microcontroller based on real-time feedback from one inertial measurement unit and a customized force sensitive resistor. The device is fully untethered with all the components integrated on-board, with a total weight of less than 1 kg. Five healthy subjects performed over-ground walking tests with the proposed ankle exoskeleton for three different walking situations (normal walking, walking with simulated foot-drop, and walking on an uneven terrain) and three walking conditions (without the exoskeleton, with the exoskeleton powered off, and with the exoskeleton powered on). From the test results, we confirmed the feasibility of the proposed ankle exoskeleton for foot-drop prevention, propulsion assistance, and inversion/eversion stabilization. The ankle exoskeleton showed a potential for wearable gait rehabilitation for stroke patients with high mobility and portability.

关键词： Legged locomotion Exoskeletons Propulsion Robots DC motors Stroke (medical condition) Connectors

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Microstructure and Quasi-Static mechanical Behavior of Cryoforged AA2519 Alloy

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Materials Sciences and Applications 2019年第2期10卷 137-149页

作者： Amin Azimi Gbadebo Moses Owolabi Hamid Fallahdoost Nikhil Kumar Horace Whitworth Department of Mechanical Engineering Howard University Washington DC USA Department of Mechanical Engineering Materials Science and Engineering Program Binghamton University (SUNY) Binghamton NY USA

In this study, AA2519 alloy was initially processed by multi axial forging (MAF) at room and cryogenic temperatures. Subsequently, the microstructure and the mechanical behavior of the processed samples under quasi-static loading were investigated to determine the influence of cryogenic forging on alloys’ subgrains dimensions, grain boundaries interactions, strength, ductility and toughness. In addition, the failure mechanisms at the tensile rupture surfaces were characterized using scanning electron micro-scope (SEM). The results show significant improvements in the strength, ductility and toughness of the alloy as a result of the cryogenic MAF process. The formation of nanoscale crystallite microstructure, heavily deformed grains with high density of grain boundaries and second phase breakage to finer particles were characterized as the main reasons for the increase in the mechanical properties of the cryogenic forged samples. The cryogenic processing of the alloy resulted in the formation of an ultrafine grained material with tensile strength and toughness that are ~41% and ~80% higher respectively after 2 cycles MAF when compared with the materials processed at ambient temperature. The fractography analysis on the tested materials shows a substantial ductility improvement in the cryoforged (CF) samples when compared to the room temperature forged (RTF) samples which is in alignment with their stress-strain profiles. However, extended forging at higher cycles than 2 cycles led only to increase in strength at the expense of ductility for both the CF and RTF samples.

关键词： AA2519 Aluminum Alloy Cryogenic Forging Quasi-Static mechanical Behavior Microstructure Investigation Fractography Analysis

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