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A Novel High-Entropy Amorphous Thin Film with High Electrical Resistivity and Outstanding Corrosion Resistance

Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1537-1545页

作者： Chuang-Shi Feng Tian-Wei Lu Tian-Li Wang Man-Zhen Lin Junhua Hou Wenjun Lu Wei-Bing Liao College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China

This study explores a novel WNbMoTaV high-entropy thin film(HETF)in amorphous structure via pulsed laser deposition *** formation of amorphous structure of this high-entropy alloy is ascribed to the high cooling rate during the deposition *** HETF shows a smooth surface with a height fl uctuation of less than 13 *** film has a high electrical resistivity of~320.6μΩ·cm and a low corrosion current density of 0.088μA/cm *** corrosion resistance of the HETF at ambient temperature is superior to the conventional AISI 316 L stainless *** high electrical resistivity and excellent corrosion resistance of the HETF are mainly attributed to its chemical disorder,cocktail effect and homogeneous amorphous *** experimental phenomenon not only provides a basis for the preparation of amorphous alloy films with low glass forming ability by pulsed laser deposition system,also promotes the potential application of WNbMoTaV HETF in the microelectronic components as resistivity sensors.

关键词： High-entropy alloys Thin films Electrical resistivity Microstructures Corrosion behaviors

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HEAT SHIELDING OF CARBON FIBER REINFORCED POLYMER COMPOSITES WITH MULTILAYER POLYMERCLAY FILMS

HEAT SHIELDING OF CARBON FIBER REINFORCED POLYMER COMPOSITES...

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SAMPE 2023 Conference and Exhibition

作者： Mandal, Tanaya Rodriguez-Melendez, Danixa Palen, Bethany Long, Carolyn T. Chiang, Hsu-Cheng Sarikaya, Sevketcan Naraghi, Mohammad Grunlan, Jaime C. Department of Materials Science and Engineering College StationTX United States Department of Chemistry College StationTX United States Department of Mechanical Engineering College StationTX United States Department of Aerospace Engineering College StationTX United States

ISBN: (纸本)9781934551431

Carbon fiber reinforced polymer (CFRP) composites have many applications in the automotive, aerospace, civil engineering, and medical industries based on their enhanced mechanical properties such as increased strength and corrosion resistance and low density. On the other hand, CFRPs' mechanical properties are diminished at increased temperatures since the polymer matrix degrades at high temperatures. In order to thermally shield the CFRPs, the composites were encased by layer-by-layer (LbL) assembly with a polymer-clay water-based multilayer film coating. This coating demonstrates insulation of the composites at high temperatures during mechanical testing with flame where the CFRP composites' backside temperature is reduced to below 100 oC. During dynamic mechanical analysis, the coating functions as a mechanical barrier by retaining the storage modulus of the composite longer compared to uncoated post-burn composite samples. During Xray photoelectron spectroscopy (XPS), the coating functioned as oxidative degradation barrier. This water-based polymer-clay coating shields CFRP and other cutting-edge composites from increased mechanical loads and extreme temperatures, making it particularly viable for applications in aerospace. © 2023 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Nanocomposites

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Assessing the Digital Transformation Maturity of SMEs: A Systematic Literature Review 9

Assessing the Digital Transformation Maturity of SMEs: A Sys...

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Joint 9th International Conference on Digital Arts, Media and Technology with 7th ECTI Northern Section Conference on Electrical, Electronics, Computer and Telecommunications engineering, ECTI DAMT and NCON 2024

作者： Fernando, W. Madushan Perera, H. Niles Chandima Ratnayake, R.M. Thibbotuwawa, Amila University of Moratuwa Center for Supply Chain Operations and Logistics Optimization Katubedda10400 Sri Lanka University of Stavanger Department of Mechanical and Structural Engineering and Materials Science Stavanger Norway

ISBN: (纸本)9798350318241

Small and medium-sized enterprises (SMEs) are the cornerstone of global economic growth that is sustainable. Technological advancement, market pressure, and the Covid pandemic accelerated SMEs' digital transformation. However, the lower adaptability rate of digital technologies is a widespread issue around the world. Before implementing a digital strategy, it is critical to conduct a digital maturity assessment to determine the current state of the business. There is a lack of review articles regarding the digital maturity assessment of SMEs. Through a systematic literature search and an author keyword cluster analysis, this paper attempted to fill this gap. The paper demonstrates that this research domain could be divided into three major research clusters. © 2024 IEEE.

关键词： Cluster analysis

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Efficient Electromagnetic Wave Absorption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Abundant Nano‑Sized Cavities and Attenuation Interfaces

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Nano-Micro Letters 2024年第1期16卷 370-383页

作者： Haoyu Ma Maryam Fashandi Zeineb Ben Rejeb Xin Ming Yingjun Liu Pengjian Gong Guangxian Li Chul B.Park College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University24 Yihuan RoadNanyiduanChengdu 610065SichuanPeople’s Republic of China Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Jiangsu JITRI Advanced Polymer Materials Research Institute Tengfei Building88 Jiangmiao RoadJiangbei New DistrictNanjing 211800JiangsuPeople’s Republic of China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China

Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)*** fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.

关键词： Nano-pore size Heterogeneous interface Electromagnetic wave absorption Thermal infrared stealth Nano-aerogel

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Unveiling Waste Patterns in Tea Smallholder Producer Supply Chains: A Case Study from a Developing Economy 9

Unveiling Waste Patterns in Tea Smallholder Producer Supply ...

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作者： Fernando, W Madushan Thibbotuwawa, Amila Ratnayake, Rm Chandima Perera, H Niles University of Moratuwa Center for Supply Chain Operations and Logistics Optimization Katubedda10400 Sri Lanka University of Stavanger Department of Mechanical and Structural Engineering and Materials Science Stavanger Norway

ISBN: (纸本)9798350318241

The sustainable management of waste in supply chains is of utmost importance, particularly in the context of smallholder producers. This paper aims to unveil waste patterns in the supply chains of smallholder tea producers in Sri Lanka by employing an integrated approach that incorporates Value Chain Mapping (VCM), lean thinking, and Interpretive Structural Modeling (ISM). The study investigates the complexities and interdependencies within the supply chains and identifies key waste generation points and factors contributing to waste in the context of the smallholder tea producer industry in Sri Lanka. The ISM methodology facilitates the development of a comprehensive framework that enables the devising and effective implementation of waste reduction strategies for the smallholder farming sector. The findings highlight root causes such as inadequate investment, regulatory gaps, technology limitations, and contract issues, which are identified as critical hindrances. Vulnerable waste drivers, including limited market access, reduced yield, compromised quality, and low replanting rates, underscore the significance of addressing these challenges through strengthened regulations, technology integration, and improved contracts. This, in turn, can enhance supply chain resilience and sustainability, promoting inclusive economic progress for smallholders and facilitating broader environmental sustainability in the smallholder farming sector. © 2024 IEEE.

关键词： Supply chains

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Multi-response optimization of physical, mechanical and tribological properties of alumina and graphite-reinforced aluminium matrix composites

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JMST Advances 2024年第3期6卷 283-296页

作者： Daba, Robale Dinsa Sinha, Devendra Kumar Beri, Habtamu Kumar, Anil Yadav, Anshul School of Mechanical Chemical and Materials Engineering Adama Science and Technology University Adama Ethiopia Department of Mechanical Engineering Kamla Nehru Institute of Technology Sultanpur India

This study investigates the physical (density, porosity), mechanical (hardness, compressive strength) and tribological (wear loss, coefficient of friction) properties of aluminium metal matrix composites reinforced by the varied amount of alumina and graphite particles fabricated via the powder metallurgy process. The density increased with the incorporation of alumina and decreased with the incorporation of graphite. The porosity of the composites increased with the increase in of reinforcements due to poor wettability and low compaction pressure during the experiments. The experimental investigations revealed that the hardness and compressive strength increased with an increase in alumina content due to high hardness of alumina particles. Nevertheless, the wear loss and coefficient of friction of the composite decreased with an increase in graphite content due to its lubricating properties. The microstructural study revealed a uniform distribution of reinforcement in the composite, with debonding and wetting occurring at high alumina content. The Taguchi L16 orthogonal array has been utilized to plan and design experiments by selecting different factors (alumina content, graphite content, compaction pressure, compaction time, milling time, load, sliding speed) at four levels. The optimizations of process parameters were done through grey relational analysis.

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Study on low cycle fatigue of ferritic-martensitic steel at high temperature 2

Study on low cycle fatigue of ferritic-martensitic steel at ...

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2023 2nd International Conference on materials engineering and Applied Mechanics, ICMEAAE 2023

作者： Feng, Zhao Hu, Yifeng Cheng, Pengming Liu, Xiao Wang, Hui Department of Engineering Mechanics Xi'An University of Technology China School of Materials Science and Engineering Xi'An Jiaotong University China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu610213 China School of Mechanical Engineering Chengdu University Chengdu610106 China

In 2011, a serious nuclear accident occurred in Fukushima, Japan, and one of the major causes was the destruction of the cladding material mainly made of Zr alloy due to a violent chemical reaction with high-temperature water vapor. Since then, scholars in various countries have been trying to find a better nuclear fuel cladding material. Because of its high temperature strength, ferritic/martensitic(F/M) steel is used in thermal power units. Over the past hundred years, the high temperature performance of ferritic/martensitic steel has developed simultaneously with the operating temperature of thermal power system. F/M steel is widely used in nuclear power system as well as thermal power, The fatigue life of nuclear fuel cladding material is an important parameter to study its service life, due to the special shape of the cladding material, especially for the pipe with a thickness of less than 0.5mm, it is difficult to directly measure its mechanical properties, this paper through special experimental materials and fixtures F/M pipe steel at room temperature and high temperature tensile test, as well as low cycle fatigue performance test, and its fracture port, surface crack analysis. Through the analysis and processing of experimental data, typical stress-cycle life curves, total strain amplitude-life curves, elastic strain amplitude-life curves, hysteresis curves with different strain amplitudes, and fatigue life prediction curves were obtained. © Published under licence by IOP Publishing Ltd.

关键词： Nuclear fuels

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Single-photon emission from colloidal perovskite nanocrystals

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National science Review 2025年第5期12卷 10-14页

作者： Qingsen Zeng Shinyoung Hwang Hyeree Kim Tae-Woo Lee Department of Materials Science and Engineering Seoul National University Research Institute of Advanced Materials Seoul National University Interdisciplinary Program in Bioengineering Seoul National University SN Display Co.Ltd Institute of Engineering Research Soft Foundry Research Institute of Advanced Materials Seoul National University

A single-photon source (SPS) is a device that emits individual photons sequentially. SPSs are fundamental to the progress of quantum information technologies, in which photons convey quantum information. Photons have properties such as polarization, and spatial and temporal modes, which can be used to encode quantum information.

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Assembly of exfoliated α-zirconium phosphate nanosheets:Mechanisms and versatile applications

Aggregate

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Aggregate 2022年第4期3卷 41-60页

作者： Hao Ding Abbas Ahmed Kuangyu Shen Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticutUSA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsConnecticutUSA Department of Biomedical Engineering University of ConnecticutStorrsConnecticutUSA

α-Zirconium phosphate(Zr(HPO_(4))_(2)⋅H_(2)O,α-ZrP)is an inorganic layered *** the first report of crystallineα-ZrP in 1964,thanks to its simple synthesis and unique physiochemical properties,α-ZrP has found widespread application in many fields including mechanical reinforcing,barrier improvement,flame retardancy,anticorrosion,catalysis,environment,energy,and *** of the ease of exfoliation ofα-ZrP to obtain single-layer nanosheets,as well as its rich surface chemistry thanks to the high density of orderly arranged surface acidic hydroxyl groups,α-ZrP single-layer nanosheets are ideal building blocks for self-assembly or assembly with other *** assembly ofα-ZrP nanosheets could form a randomly dispersed structure(isotropic),roughly ordered structure(nematic),or highly ordered structure(smectic)within liquid colloids or solid hybrids(including hydrogels).Thanks to the combination of the unique structures and the novel functions of the components,the assembled materials have found a wide verity of applications due to their excellent *** this article,the methods to synthesizeα-ZrP,the approaches and mechanisms to exfoliateα-ZrP,and the strategies to assembleα-ZrP nanosheets to form various structures,as well as the applications of the assembled materials are *** emerging prospects ofα-ZrP nanosheets as a key material in next-generation functional applications are envisioned.

关键词： application assembly exfoliation nanosheets α-zirconium phosphate

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Graphene-functionalized textile composites for wearable Joule heating applications

Advanced Nanocomposites

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Advanced Nanocomposites 2025年 2卷 108-123页

作者： Omar Faruk Abbas Ahmed Ashfaqul Hoque Khadem Lu Jia Luyi Sun Department of Materials Science and Engineering Binghamton University State University of New York at Binghamton NY 13902 USA Polymer Program Institute of Materials Science and Department of Chemical & Biomolecular Engineering University of Connecticut Storrs CT 06269 USA Department Mechanical Engineering College of Engineering Computing and Applied Science Clemson University Clemson SC 29634 USA College of Textile Engineering Taiyuan University of Technology Jinzhong Shanxi 030600 China

Thermal comfort is essential for maintaining physiological well-being, with textile materials traditionally serving as the primary medium for regulating heat exchange between the body and its environment. However, conventional textiles often fall short of maintaining optimal thermal balance. So, there is an increasing demand for advanced thermoregulation systems that can effectively reduce heat loss and enhance warmth, ensuring consistent comfort. Recent research has highlighted the promise of advanced functional materials, especially graphene and its composites, for modifying textiles to improve thermal properties. This article comprehensively reviews recent advancements in graphene-functionalized textile composites, focusing on their applications in wearable Joule heaters designed for personalized thermal comfort or thermal therapy. Various graphene-functionalized textile composites are reviewed from the perspectives of material properties, processing strategies and device fabrication methods. Key challenges and future opportunities are summarized for graphene-functionalized textile-based Joule heaters as innovative solutions in wearable thermal regulation.

关键词： Graphene Textile Composite Wearable electronics Joule heater

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