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8th International Multidisciplinary Moratuwa engineering Research Conference, MERCon 2022

作者： Vithusan, T. Nashira, M.N.F. Adikary, S.U. University of Moratuwa Department of Material Science and Engineering Moratuwa Sri Lanka

ISBN: (数字)9781665487863

ISBN: (纸本)9781665487863

Due to recent developments in energy harvesting, there has been a subsequent rise in MEMS (Micro electromechanical systems) powered by low-frequency vibrations in the environment through effective transduction procedures like piezoelectricity. In this paper, a vertically integrated single piezoelectric Zinc Oxide nanowire-based system is modelled for energy harvesting applications. To reinforce this development, different structures of nanogenerators were modelled and simulated using COMSOL Multiphysics 5.3 software for their performance upgrades. It was developed to analyse the compression and bending effect of the nanowire. To compare and validate the induced piezoelectric output, mathematical equations were derived using piezoelectric constitutive equations. Moreover, the voltage output of the nanowire under a constant lateral force was analysed varying with the nanowire dimensions in terms of aspect ratio. The analysis results have shown that the compression of ZnO nanowire gives more output voltage compared to the bending of the nanowire for the same nanogenerator. The theoretical and simulation results also prove that the length of the nanowire does not influence the piezoelectric potential in a lateral bent nanowire. © 2022 IEEE.

关键词： Finite element method

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Comparison of iron aluminide Fe_(3)Al with armour steel in ballistic behaviour OA

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Defence Technology（防务技术） 2024年第12期42卷 183-190页

作者： Pavel Hanus Milan Pecanac Mirjana Trivkovic Savo Bojic Sebastian Balos Technical University of Liberec Faculty of EngineeringDepartment of Material ScienceStudentska 2CZ 46117LiberecCzech Republic University of Novi Sad Faculty of Technical SciencesDepartment of Production EngineeringTrg Dositeja Obradovica 621000Novi SadSerbia University of Novi Sad Faculty of Technical SciencesMechanization and Construction EngineeringTrg Dositeja Obradovica 621000Novi SadSerbia

Intermetallic aluminide compounds possess several potential advantages compared to alloyed steels,like enhanced oxidation resistance,lower density and the omittance of critical raw *** aluminides,compared to other transition metal-aluminides of TM_(3)-Al type,although having a higher density compared to titan-aluminides,have a lower density compared to nickel-aluminides,but also a higher ductility than both alternatives,making this material potentially effective in ballistic protection ***-wise,this material may be a worthy alternative to armour steels,which was the aim of this *** materials,Fe_(3)Al intermetallic compound(F3A-C)and Armox 500 armour steel were ballistically tested against tungsten-carbide(WC)armour-piercing ammunition,in accordance with STANAG *** ballistic testing,microhardness and metallographic testing were performed,revealing differences in strain hardening,crack propagation mode and exit hole morphology.F3A-C ballistic resistance is similar to that of armour steel,in spite of the lower tensile and impact mechanical properties,relying on a considerably higher strain hardening rate,thermal properties and a lower density.

关键词： Iron aluminide Armour steel Ballistic testing Impact testing Sem microscopy

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On the Necessity for Improving Effectiveness of Qualification Process for Spare Parts Additive Manufacturing in a Circular Economy Supply Chain

On the Necessity for Improving Effectiveness of Qualificatio...

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2022 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2022

作者： Chandima Ratnayake, R.M. University of Stavanger Department of Mechanical and Structural Engineering and Material Science Norway

ISBN: (数字)9781665486873

ISBN: (纸本)9781665486873

Additive manufacturing (AM) has attracted extensive research attention, due to the flexibility and capability to deal with additive manufactured (AM 'ed) parts with complicated geometries. Benefiting from the recent development of material technology, manufacturing control tools, and integrated platforms, powder bed fusion (PBF) based AM has been successfully extended to build free form metallic parts. A more comprehensive understanding of the powder processing thermos mechanical metallurgical characteristics correlation is still lacking for the metallic AM. The metallic AM process involves non-uniform temperature distributions and rapid thermal cycles that result in microstructures featured with porosity and anisotropy. The different microstructure features critically affect the mechanical properties of the AM'ed parts. It is necessary to establish optimal parameters' combination that provides predefined microstructure in an AM process to achieve desired mechanical properties of the AM builds. The AM'ed parts qualification is a requirement to assure accurate and repeatable builds. First, this manuscript demonstrates the use of parameter design approach for simulations and experimental validation to establish optimal parameter combinations to develop a qualification record. Second, it presents a framework illustrating how to perform feedstock metal powder production, AM of parts, qualification, and reuse of material in an integrated circular economy supply chain. © 2022 IEEE.

关键词： Supply chains

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Polymer Fiber Rigid Network with High Glass Transition Temperature Reinforces Stability of Organic Photovoltaics

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Nano-Micro Letters 2024年第11期16卷 56-69页

作者： Qiao Zhou Cenqi Yan Hongxiang Li Zhendong Zhu Yujie Gao Jie Xiong Hua Tang Can Zhu Hailin Yu Sandra P.Gonzalez Lopez Jiayu Wang Meng Qin Jianshu Li Longbo Luo Xiangyang Liu Jiaqiang Qin Shirong Lu Lei Meng Frédéric Laquai Yongfang Li Pei Cheng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China KAUST Solar Center Physical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China Department of Material Science and Technology Taizhou UniversityTaizhou 318000People’s Republic of China

Organic photovoltaics(OPVs)need to overcome limitations such as insufficient thermal stability to be *** reported approaches to improve stability either rely on the development of new materials or on tailoring the donor/acceptor morphology,however,exhibiting limited ***,it is timely to develop an easy method to enhance thermal stability without having to develop new donor/acceptor materials or donor–acceptor compatibilizers,or by introducing another third ***,a unique approach is presented,based on constructing a polymer fiber rigid network with a high glass transition temperature(T_(g))to impede the movement of acceptor and donor molecules,to immobilize the active layer morphology,and thereby to improve thermal stability.A high-T_(g) one-dimensional aramid nanofiber(ANF)is utilized for network *** OPVs with ANF network yield superior thermal stability compared to the ANF-free *** ANF network-incorporated active layer demonstrates significantly more stable morphology than the ANF-free counterpart,thereby leaving fundamental processes such as charge separation,transport,and collection,determining the device efficiency,largely *** strategy is also successfully applied to other photovoltaic *** strategy of incorporating a polymer fiber rigid network with high T_(g) offers a distinct perspective addressing the challenge of thermal instability with simplicity and universality.

关键词： Inverted organic photovoltaics Thermal stability Aramid nanofibers Morphology control Charge carrier dynamics

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Bimetallic active site nuclear-shell heterostructure enables efficient dual-functional electrocatalysis in alkaline media

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Rare Metals 2023年第9期42卷 3024-3033页

作者： Yu Cheng Xi Zhou Qin-Min Pan Li-Fang Zhang Yu-Feng Cao Tao Qian School of Chemistry and Chemical Engineering Nantong UniversityNantong226019China Institute of Chemical Industry of Forestry Products Chinese Academy of ForestryKey Lab.of Biomass Energy and MaterialNanjing210000China School of Chemical and Environmental Engineering College of ChemistryChemical Engineering and Material ScienceSoochow UniversitySuzhou215123China Department of Chemical Engineering University of WaterlooWaterlooONN2L 3G1Canada

Hydrogen,as a green and clean next-generation fuel,is a key to achieving the goal of carbon *** an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same electrolyte is a key technology for producing hydrogen via water ***,a bimetallic active site catalyst,which possessed an edge-riched MoS_(2)nanoflakes array vertically growing on cubic CoS_(2),forming a nuclear-shell heterogeneous configuration,termed CSC-Mo S_(2)@Co S_(2).was reported The optimal CSC-Mo S_(2)@Co S_(2)-24 possessed good dualfunctional electrocatalytic activity(hydrogen evolution(HER),10 m A·cm^(-2)@241.5 m V and oxygen evolution(OER),10 m A·cm^(-2)@350 m V).Especially,CSC-Mo S_(2)@CoS_(2)-24 exhibited an extremely high mass activity for HER,and only required an overpotential of~550 m V when reaching a large current density of 1422 m A·mg^(-1),which was20.6-fold that of the bulk CoS_(2)(69 m A·mg^(-1)),as well as exhibiting stability of up to 100 *** good electrocatalytic performance was attributed to the nuclear-shell heterostructure of Mo S_(2)@CoS_(2)hybrid could bring critical synergies,improving efficient mass transfer and electron transfer processes between Co S_(2)and Mo S_(2),which collaboratively promoted the electrocatalytic *** is foreseeable that the method proposed in this work will have guiding value for the preparation of dual-functional electrocatalysts with multi-interface heterostructures by assembling layered sulfides on cubic sulfides.

关键词： Dual-functional electrocatalysts Nuclearshell cubic heterostructure Edge-riched Bimetallic active site Strong interaction

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Rapid and durable oxygen reduction reaction enabled by a perovskite oxide with self-cleaning surface

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Journal of Energy Chemistry 2023年第8期83卷 333-340,I0010页

作者： Shengli Pang Yifan Song Meng Cui Xin Tang Chao Long Lingfeng Ke Gongmei Yang Ting Fang Yong Guan Chonglin Chen Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina Department of Physics and Astronomy The University of Texas at San AntonioSan AntonioTX 78249USA College of Material Science and Engineering Guilin University of TechnologyGuilin 541004GuangxiChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026AnhuiChina

The growth of electrochemically inert segregation layers on the surface of solid oxide fuel cell cathodes has become a bottleneck restricting the development of perovskite-structured oxygen reduction ***,we report a new discovery in which enriched Ba and Fe ions on the near-surface of Nd_(1/2)Ba_(1/2)Co_(1/3)Fe_(1/3)Mn_(1/3)O_(3-δ)spontaneously agglomerate into dispersed Ba_(5)Fe_(2)O_(8) nanoparticles and maintain a highly active and durable perovskite structure on the *** unique surface selfcleaning phenomenon is related to the low average potential energy of Ba_(5)Fe_(2)O_(8),which is grown on the near-surface *** electrochemically inert Ba_(5)Fe_(2)O_(8) segregation layer on the near-surface of the perovskite catalyst achieves self-cleaning by regulating the formation energy of enriched metal *** self-cleaned perovskite surface exhibits an ultrafast oxygen exchange rate,high catalytic activity for the oxygen reduction reaction,and good adaptability to the actual working conditions of solid oxide fuel cell *** study paves a new way for overcoming the stubborn problem of perovskite catalyst surface deactivation and enriches the scientific knowledge of surface catalysis.

关键词： Surface chemistry Energy materials Electrocatalysis Perovskite oxide Oxygen reduction reaction Solid oxide fuel cells

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Strategies to enhance Li^(+) transference number in liquid electrolytes for better lithium batteries

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Nano Research 2023年第6期16卷 8055-8071页

作者： Pan Zhou Xiaokun Zhang Yong Xiang Kai Liu Department of Chemical Engineering Tsinghua UniversityBeijing 100084China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Advanced Energy Research Institute University of Electronic Science and Technology of ChinaChengdu 611731China Sichuan Provincial Engineering Research Center of Flexible Display Material Genome University of Electronic Science and Technology of ChinaChengdu 611731China

Growing market demand from portable electronics to electric automobiles boosts the development of lithium-ion batteries(LIBs)with high energy density and rate ***,strong solvation effect between lithium ions(Li^(+))and solvent molecules in common electrolytes limits the mobility of Li^(+)ions in ***,anions dominate the charge conduction in electrolytes,and in most cases,the value of Li^(+)transference number(T_(+))is between 0.2 and 0.4.A low T_(+)will aggravate concentration polarization in the process of charging and discharging,especially at high rate,which not only increases the overpotential but also intensifies side reactions,along with uneven deposition of lithium(Li)and the growth of lithium dendrites when lithium metal is used as *** this review,promising strategies to improve T_(+)in liquid electrolytes would be *** migration of Li^(+)ions is affected directly by the types and concentration of lithium salts,solvents,and additives in bulk ***,Li^(+)ions will pass through the separator and solid electrolyte interphase(SEI)when transferring between anodes and *** this in mind,we will classify and summarize threads of enhancing T_(+)from five aspects:lithium salts,solvents,additives,separators,and SEI based on different mechanisms,including covalently bonding,desolvation effect,Lewis acid-base interaction,electrostatic interaction,pore sieving,and supramolecular *** believe this review will present a systematic understanding and summary on T_(+)and point out some feasible threads to enhance battery performance by enhancing T_(+).

关键词： lithium batteries Li^(+)transference number rate performance strategies mechanisms

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Physicochemical properties of lard oil and rubber seed oil blends and their comprehensive characterization

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Chinese Journal of Chemical engineering 2024年第11期75卷 1-13页

作者： Amonrat Thangthong Wuttichai Roschat Phongsakorn Pholsupho Aekkaphon Thammayod Sunti Phewphong Tappagorn Leelatam Preecha Moonsin Boonyawan Yoosuk Pathompong Janetaisong Vinich Promarak Program of Environment Science Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Biomass Energy Research Laboratory Center of Excellence on Alternative EnergyResearch and Development InstitutionSakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Program of Chemistry Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Innovation in Chemistry for Community Research Unit Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Appropriated Technology Center Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Program of Chemistry Faculty of ScienceUbon Ratchathani Rajabhat UniversityMueang DistrictUbon Ratchathani 34000Thailand National Energy Technology Center(ENTEC) 114 Thailand Science ParkPhahonyothin RoadKlong LuangPathumthani 12120Thailand Department of Material Science and Engineering School of Molecular Science&EngineeringVidyasirimedhi Institute of Science and TechnologyWangchanRayong 21210Thailand

This research investigates the potential of blending complementary lard oil with rubber seed oil as feedstock for biodiesel *** seed oil,obtained through hexane extraction using the Soxhlet method,contains the major fatty acids of oleic acid(C_(18:1)),palmitic acid(C_(16:0)),linoleic acid(C_(18:2)),and stearic acid(C_(18:0)),while rubber seed oil primarily consists of linoleic acid(C_(18:2)),oleic acid(C_(18:1)),linolenic acid(C_(18:3)),palmitic acid(C_(16:0)),and stearic acid(C_(18:0)).The least acid value of lard oil(0.55 mg KOH/g)can benefit of reducing soap formation of rubber seed oil during transesterification process in biodiesel production due to its substantial-high acid value(16.28 mg KOH/g).Blending at ratios below 80:20 volume ratio produced biodiesel exceeding 85%,utilizing CaO as a *** oil demonstrated a higher reaction rate constant(11.88×10^(-3)min^(-1))than rubber seed oil(2.11×10^(-3)min^(-1)),indicating a significant difference in *** acid value and free fatty acids in rubber seed oil correlated with lower reaction *** a mixture ratio below 80:20 volume ratio optimized reaction rates during biodiesel *** obtained from blends below 80:20 volume ratio met ASTM D6751 and EN 14214 standards,demonstrating suitability for bio-auto *** drawbacks of using rubber seed oil as a raw material for biodiesel production are overcome by blending with lard oil,giving rise to expanding renewable energy options for rural communities,community enterprises,and large-scale biodiesel production.

关键词： Biodiesel oil Rubber seed oil Lard oil High free fatty acid Physicochemical properties Liquid biofuels

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The Indoor People Tracking and Counting System

The Indoor People Tracking and Counting System

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2023 International Automatic Control Conference, CACS 2023

作者： Lin, Hao-Pu Han, Chin-Chuan Liao, Jun-Wei Ciou, Chong-Han Hong, Yi-Cheng Tan, Ming-Lun National United University Ph. D. Program in Material and Chemical Engineering MiaoLi Taiwan National United University Department of Computer Science and Information Engineering MiaoLi Taiwan

ISBN: (纸本)9798350306354

COVID-19 outbreaks and becomes serious from 2019 winter. Taking body temperature, wearing masks, recording footprint and avoiding crowds become important tasks and require a lot of manpower support for the prevention of the epidemic in every. In this study, we have integrated the infrared thermometer devices to measure people temperature and the people identities through RGB images at the entrance of buildings. Using the computer vision and deep learning methods, we would like to build a 24/7 and region-wide coverage assistance system to automatically record the footprint of a specific people in the building. We also detect if people taking off their masks in the yard at any time. The processing videos are grabbed from the existing CCTV systems. The developed system also locates the crowd and calculate the number of people in a specified area, and the manager can know the number of people and control the access in real time. It will reduce the burden of manpower. In addition, we have optimized the system performance to handle multiple camera videos and to reduce the hardware cost at the same time. © 2023 IEEE.

关键词： Access control

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Site difference influence of anchored Ru in mesoporous carbon on electrocatalytic performance toward pH-universal hydrogen evolution reaction

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Rare Metals 2023年第12期42卷 4015-4028页

作者： Xiao-Fang Ma He Xiao Yan-Ying Jing Yang Gao Ying-Luo He Man Zhao Jian-Feng Jia Hai-Shun Wu Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030032China Department of Applied Chemistry School of EngineeringUniversity of ToyamaToyama 930-8555Japan

Ru-based electrocatalysts have demonstrated excellent electrocatalytic performance toward hydrogen evolution reaction(HER).However,designing Ru nanoparticles/nanoclusters(Ru NPs/NCs)with abundant accessible active sites is ***,a selective facile hydrothermal in situ polymerization strategy is described to accurately control the anchoring point of Ru in hollow mesoporous carbon spheres(HMCs)(outer surface,HMCs@Ru;cavity,Ru@HMCs;and pore channels,Ru/SHMCs).The HER mechanisms of the three catalysts over a wide pH range were revealed by analyzing the loading position,content,dispersion,particle size,and valence state of ***@Ru shows excellent area activity,with overpotentials of 64.3,2.8,and 78.1 mV at 10 mA·cm^(-2)in0.5 mol·L^(-1)H_(2)SO_(4),1 mol·L^(-1)KOH;and 0.5 mol·L^(-1)phosphate buffer saline(PBS)solutions,***/S-HMCs exhibit high mass activity,with values 43.3,2.9,and 12.7 times those of Pt/C in alkaline,acidic,and neutral media,respectively,at-50 mV(*** hydrogen electrode(RHE)).After 2000 cyclic voltammetry cycles,the performances of HMCs@Ru and Ru/S-HMCs hardly decrease,indicating good *** excellent electrocatalytic activity can be attributed to two main factors:(1)the confinement effect,which not only promotes high Ru dispersion but also prevents the leaching of active metal under harsh conditions,and(2)their excellent structural *** catalyst structure features a large hollow located in the center(~160 nm in diameter)and an ultrathin monolayer of mesopores(~6 nm)uniformly distributed on the hollow shells,ensuring fast mass diffusion and electron transfer kinetics,as well as complete accessibility of catalytic sites.

关键词： Confinement effect Ru Monolayer hollow mesoporous carbon(HMC) Hydrogen evolution reaction(HER)

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