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Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

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Journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： H.t.Jeong S.W.lee W.J.Kim department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

the superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2d and 3d formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy Superplasticity Severe plastic deformation Grain size Grain growth

Chebyshev polynomial-based Ritz method for thermal buckling and free vibration behaviors of metal foam beams

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 891-910页

作者： N.d.NGUYEN t.N.NGUYEN Faculty of Civil Engineering Ho Chi Minh City University of Technology and EducationHo Chi Minh City 71309Viet Nam Faculty of Engineering and technology Kien Giang UniversityChau Thanh 92000Viet Nam

this study presents the Chebyshev polynomials-based Ritz method to examine the thermal buckling and free vibration characteristics of metal foam *** analyses include three models for porosity distribution and two scenarios for thermal *** material properties are assessed under two conditions,i.e.,temperature dependence and temperature *** theoretical framework for the beams is based on the higher-order shear deformation theory,which incorporates shear deformations with higher-order *** governing equations are established from the Lagrange equations,and the beam displacement fields are approximated by the Chebyshev *** simulations are performed to evaluate the effects of thermal load,slenderness,boundary condition(BC),and porosity distribution on the buckling and vibration behaviors of metal foam *** findings highlight the significant influence of temperature-dependent(td)material properties on metal foam beams'buckling and vibration responses.

关键词： Ritz method Chebyshev function buckling vibration metal foam beam higher-order beam theory(HOBt)

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电场作用下高分子中自陷束缚激子的极化

物理学报 1998年第1期47卷 94-101页

作者：傅柔励叶红娟李蕾傅荣堂缪健孙鑫张志林中国科学院上海技术物理研究所红外物理国家重点实验室复旦大学李政道物理学综合实验室上海大学嘉定分校材料学院

用同时计入电场、对称破缺项ｔｅ和电子晶格相互作用的紧束缚模型研究了电场作用下高分子中的自陷束缚激子．发现电场使高分子中自陷束缚激子内电荷发生转移，出现极化．极化程度随场强增加，也与ｔｅ有关．并发现ｔｅ≤０．１ｅＶ时... 详细信息

用同时计入电场、对称破缺项ｔｅ和电子晶格相互作用的紧束缚模型研究了电场作用下高分子中的自陷束缚激子．发现电场使高分子中自陷束缚激子内电荷发生转移，出现极化．极化程度随场强增加，也与ｔｅ有关．并发现ｔｅ≤０．１ｅＶ时，双激子态表现出反向极化特性，这一特性可根据极化的量子力学理论得到理解：对高分子的自陷束缚激子，其禁带中央附近存在两个靠得很近的定域电子态即上定域态和下定域态，用微扰论说明了上定域态是反向极化而下定域态为正向极化；双激子态即上定域态被占而下定域态空着，当ｔｅ不大时，双激子态的极化就是反向的．

关键词：电致发光器件电场高分子自陷束缚激子极化

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HLA-BW35与儿童结核病

中华医学杂志 1984年第4期64卷 210-212+260页

作者：江载芳安家宾徐林敏张新根毛文华王香怀李庆宁孙逸平 K.K.Mittal t.d.lee 北京儿童医院内科北京儿童医院儿科研究所临床白细胞分型实验室北京结核病研究所美国国立药物生物学中心美国红十字会血液实验室

作者报告了对101例结核病患儿其中包括36例结核性脑膜炎患儿进行HLA-A、B抗原的分型结果,并与308名北京地区的随机人群作了比较。发现结核病患儿,特别是结核性脑膜炎患儿的HLA-BW 35抗原显著增高。并对HLA与儿童结核病的关联问题进行了... 详细信息

作者报告了对101例结核病患儿其中包括36例结核性脑膜炎患儿进行HLA-A、B抗原的分型结果,并与308名北京地区的随机人群作了比较。发现结核病患儿,特别是结核性脑膜炎患儿的HLA-BW 35抗原显著增高。并对HLA与儿童结核病的关联问题进行了探讨。

关键词： HLA抗原/分析结核结核脑膜/免疫学

Near resonance vibration isolation on a levered-dual response(LEdAR)Coulomb-damped system by differential preloads/offsets in linear springs

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 1033-1050页

作者： t.I.tOLUWALOJU C.K.tHEIN d.HALIM department of Mechanical Materials and Manufacturing EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100Zhejiang ProvinceChina Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo ChinaNingbo 315048Zhejiang ProvinceChina

the levered-dual response(LEdAR)Coulomb-damped system attains near resonant vibration isolation by differential preloads/offsets in linear *** takes the advantages of both the preloads/offsets in linear springs and the guiderail friction for realizing different levels of vibration *** isolation capacities are investigated on the strategies with both the horizontal and vertical guiderails,with the horizontal rail only,and without *** compressive preloads generally result in the consumption of most of the initial excitation energy so as to overcome the potential *** isolation onsets at the frequency ratio of 1∓0.095 on the left-hand side(LHS)and the right-hand side(RHS)of the lever are relative to the load plate *** observed near resonant isolation thus makes the LEdAR system a candidate for the isolation of the mechanical systems about resonance while opening a path for simultaneous harvesterisolation functions and passive functions at extreme frequencies.

关键词： lever ratio Coulomb damping preload tension/compression isolation band/depth offset potential

A Review on Soft Ionic touch Point Sensors

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Energy & Environmental Materials 2024年第6期7卷 193-208页

作者： Gibeom lee donghyun lee Gwang-Bum Im Younghoon lee department of Mechanical Engineering Gachon University1342 SeongnamdaeroSujeong-guSeongnam 13120South Korea department of Surgery Harvard Medical SchoolBostonMassachusetts 02115USA

A touch sensor is an essential component in meeting the growing demand for human-machine *** sensors have been developed in wearable,attachable,and even implantable forms to acquire a wide range of information from *** be applied to the human body,sensors are required to be biocompatible and not restrict the natural movement of the *** materials are a promising candidate for soft touch sensors due to their outstanding properties,which include high stretchability,transparency,ionic conductivity,and ***,this review discusses the unique features of soft ionic touch point sensors,focusing on the ionic material and its key role in the *** touch sensing mechanisms include piezocapacitive,piezoresistive,surface capacitive,piezoelectric,and triboelectric and triboresistive *** review analyzes the implementation hurdles and future research directions of the soft ionic touch sensors for their transformative potential.

关键词： iontronics ionic materials soft materials touch sensors

Enhancing Identity Protection in Metaverse-Based Psychological Counseling System

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Computers, Materials & Continua 2024年第1期78卷 617-632页

作者： Jun lee Hanna lee Seong Chan lee Hyun Kwon department of Game Software Hoseo UniversityAsan-si31499Korea Yatav Enter Seoul04799Korea department of Artificial Intelligence and data Science Korea Military AcademySeoul01805Korea

Non-face-to-face psychological counseling systems rely on network technologies to anonymize information regard-ing client ***,these systems often face challenges concerning voice data leaks and the suboptimal communication of the client’s non-verbal expressions,such as facial cues,to the *** study proposes a metaverse-based psychological counseling system designed to enhance client identity protection while ensuring efficient information delivery to counselors during non-face-to-face *** proposed systemincorporates a voicemodulation function that instantlymodifies/masks the client’s voice to safeguard their ***,it employs real-time client facial expression recognition using an ensemble of decision trees to mirror the client’s non-verbal expressions through their avatar in the metaverse *** system is adaptable for use on personal computers and smartphones,offering users the flexibility to access metaverse-based psychological counseling across diverse *** performance evaluation of the proposed system confirmed that the voice modulation and real-time facial expression replication consistently achieve an average speed of 48.32 frames per second or higher,even when tested on the least powerful smartphone ***,a total of 550 actual psychological counseling sessions were conducted,and the average satisfaction rating reached 4.46 on a 5-point *** indicates that clients experienced improved identity protection compared to conventional non-face-to-face metaverse counseling ***,the counselor successfully addressed the challenge of conveying non-verbal cues from clients who typically struggled with non-face-to-face psychological *** proposed systemholds significant potential for applications in interactive discussions and educational activities in the metaverse.

关键词： Metaverse counseling system face tracking identity protection

Pyrometallurgical recycling of end-of-life lithium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1554-1571页

作者： Juheon lee Kwang Won Park Il Sohn Sanghoon lee department of Materials Science and Engineering Seoul 03722Korea Yonsei Industry Cooperation Center Yonsei UniversitySeoul 03722Korea Rd Solution Wanju gunJeollabuk do 55365Korea

the global importance of lithium-ion batteries(LIBs)has been increasingly underscored with the advancement of high-performance energy storage ***,the end-of-life of these batteries poses significant challenges from environmental,economic,and resource management *** review paper focuses on the pyrometallurgy-based recycling process of lithium-ion batteries,exploring the fundamental understanding of this process and the importance of its *** on the high energy consumption and emission gas issues of the pyrometallurgical recycling process,we systematically analyzed the capital-intensive nature of this process and the resulting technological ***,we conducted an in-depth discussion on the future research directions to overcome the existing technological barriers and *** review will provide valuable insights for researchers and industry stakeholders in the battery recycling field.

关键词： spent lithium-ion batteries recycling sustainability lithium valuable metal

Regulating interfacial stability of SiO_(x) anode with fluoride-abundant solid–electrolyte interphase by fluorine-functionalized additive

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Rare Metals 2024年第2期43卷 671-681页

作者： Subin lee taeeun Yim Advanced Batteries Laboratory Department of ChemistryIncheon National UniversityIncheon22012Republic of Korea Research Institute of Basic Sciences College of Natural ScienceIncheon National UniversityIncheon22012Republic of Korea

Silicon oxide(SiO_(x))has received remarkable attention as a next-generation battery material;however,the sudden decrease in the cycling retention constitutes a significant challenge in facilitating its ***(2,2,2-trifluoroethyl)phosphite(ttFP),which can control parasitic reactions such as the pulverization of SiO_(x)anode materials and electrolyte decomposition,has been proposed to improve the lifespan of the *** electrochemical reduction of ttFP results in solid-electrolyte interphase(SEI)layers that are mainly composed of LiF,which occur at a higher potential than the working potential of the SiO_(x)anode and carbonate-based *** electrolyte with ttFP exhibited a substantial improvement in cycling retention after 100 cycles,whereas the standard electrolyte showed acutely decreased *** thickness of the SiO_(x)anode with ttFP also changed only slightly without any considerable delamination spots,whereas the SiO_(x)anode without ttFP was prominently deformed by an enormous volume expansion with several internal *** cycled SiO_(x)anode with ttFP exhibited less increase in resistance after cycling than that in the absence of ttFP,in addition to fewer decomposition adducts in corresponding X-ray photoelectron spectroscopy(XPS)analyses between the cycled SiO_(x)*** results demonstrate that ttFP formed SEI layers at the SiO_(x)interface,which substantially reduced the pulverization of the SiO_(x)anode materials;in addition,electrolyte decomposition at the interface decreased,which led to improved cycling retention.

关键词： Lithium-ion batteries(LIBs) Silicon oxide anode Electrolyte Additive Solid-electrolyte interphases(SEI) tris(2,2,2-trifluoroethyl)phosphite