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Accurate expression of neck motion signal by piezoelectric sensor data analysis

Chinese Chemical Letters 2024年第9期35卷 250-256页

作者： Neng Shi Haonan Jia Jixiang Zhang Pengyu Lu Chenglong Cai Yixin Zhang Liqiang Zhang Nongyue He Weiran Zhu Yan Cai Zhangqi Feng Ting Wang State Key Laboratory of Digital Medical engineering National Demonstration Center for Experimental Biomedical Engineering EducationSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China SceneRay Co. Ltd.Suzhou 215123China School of Chemistry and Chemical engineering Nanjing University of Science and TechnologyNanjing 210094China

The development of high-precision sensors using flexible piezoelectric materials has the advantages of high sensitivity,high stability,good durability,and *** main problem with sensing equipment is low sensitivity,which is due to the mismatch between materials and analysis methods,resulting in the inability to effectively eliminate *** address this issue,we developed the denoising analysis method to motion signals captured by a flexible piezoelectric sensor fabricated from poly(l-lactic acid)(PLLA)and polydimethylsiloxane(PDMS)*** results demonstrate that this improved denoising method effectively removes noise components from neck muscle motion signals,thus obtaining high-quality,low-noise motion signal *** decomposition and reconstruction is a signal processing technique that involves decomposing a signal into different scales and frequency components using wavelets and then selectively reconstructing the signal to emphasize specific features or eliminate *** study employed the sym8 wavelet basis for wavelet decomposition and *** the denoised signals,a high degree of stability and periodic peaks are distinctly manifested,while amplitude and frequency differences among different types of movements also become noticeably *** a result of this study,we are enabled to accurately analyze subtle variations in neck muscle motion signals,such as nodding,shaking the head,neck lateral flexion,and neck *** temporal and frequency domain analysis of denoised motion signals,differentiation among various motion states can be ***,this improved analytical approach holds broad application prospects across various types of piezoelectric sensors,such as healthcare monitoring,sports biomechanics.

关键词： Piezoelectric transducer Wavelet decomposition Muscle motion signal Signal analysis Noise component Healthcare monitoring

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Theoretical predictions on cluster radioactivity of superheavy nuclei with Z=119,120

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Chinese Physics C 2024年第1期48卷 125-137页

作者：刘洁洁王震张涵韬任中洲 School of Physics Science and engineering Tongji UniversityShanghai 200092China Key Laboratory of Advanced Micro-Structure materials Ministry of EducationShanghai 200092China

In this study,we investigate the cluster radioactivity(CR)of new superheavy elements with Z=119 and 120 based on two successful theoretical methods with modified parameters:the density-dependent cluster model(DDCM)and unified decay formula(UDF).First,we employ the DDCM and UDF to accurately reproduce the experimental half-lives of cluster emissions,which demonstrates the high reliability of our theoretical ***,we systematically predict the probable cluster modes of ^(293-311)119 and ^(293-302)120 as well as their corresponding decay energies and *** half-lives of cluster decay derived from the DDCM are consistent with those from the ***,our results reveal that the cluster emission of ^(8)Be,emitted from the Z=119 and 120 isotopic chains,exhibits the minimum half-life for cluster emission,and hence,^(8)Be emission is considered the most probable cluster decay ***,we explore the competition betweenαdecay and CR and find thatαdecay may be the dominant decay mode against ***,the good linear relationship between the decay energy and the number ofαparticles within the emitted cluster is extended to the range of superheavy nuclei(SHN).We anticipate that our theoretical predictions for CR will provide valuable references for the experimental synthesis of new SHN.

关键词： cluster radioactivity superheavy nuclei density-dependent cluster model

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The Conversion of Non-Dispersed Polymers into Low-Potassium Anti-Collapse Drilling Fluids

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Fluid Dynamics & materials Processing 2024年第2期20卷 325-335页

作者： Hao Hu Jian Guan Shanfa Tang Jialuo Rong Yuanpeng Cheng School of Petroleum engineering Yangzte UniversityWuhan430100China Hubei Key Laboratory of Oil and Gas Drilling and Production engineering Yangtze UniversityWuhan430100China School of Petroleum engineering Yangtze UniversityNational Engineering Research Center for Oil&Gas Drilling and Completion TechnologyWuhan430100China engineering Technology Research Institute of PetroChina Great Wall Drilling engineering Co. Ltd.Panjin124000China

Different drillingﬂuid systems are designed according to mineral composition,lithology and wellbore stability of different *** the present study,the conversion of a non-dispersed polymer drillingﬂuid into a low potas-sium anti-collapsing drillingﬂuid is *** the two drillingﬂuids belong to completely different types,the key to this conversion is represented by new inhibitors,dispersants and water-loss agents by which a non-dispersed drillingﬂuid can be turned into a dispersed drillingﬂuid while ensuring wellbore stability and reason-able rheology(carrying sand—inhibiting cuttings dispersion).In particular,the(QYZ-1)inhibitors and(FSJSS-2)dispersants are *** former can inhibit the hydration expansion capacity of clay,reduce the dynamic shear force and weaken the viscosity;the latter can improve the sealing effect and reduce theﬁltrate *** results have shown that after adding a reasonable proportion of these substances(QYZ-1:FSJSS-2)to the non-dispersed polymer drillingﬂuid,while the apparent viscosity,plastic viscosity,structural viscosity andﬂuidity index under-went almost negligible changes,the dynamic plastic ratio increased,and theﬁltration loss decreased signiﬁcantly,thereby indicating good *** to the tests(conducted in the Leijia area),the density was 1.293 g/cm3,and after standing for 24 h,the SF(static settlement factor)was ***,theﬁltration loss was reduced to 4.0 mL,the rolling recovery rate reached 96.92%,with excellent plugging and anti-collapse performances.

关键词： Non-dispersed polymer drilling fluid low potassium anti-collapsing drilling fluid drilling fluid conversion drilling fluid reuse filter vector

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Phase engineering of CoMo0_(4)Anode materials toward Improved Cycle Life for Li^(+)Storage

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Chinese Journal of Chemistry 2021年第5期39卷 1121-1128页

作者： Xiaoqing Huang Junhao Li Wenbiao Zhang Wenjie Huang Lichun Yang Qingsheng Gao College of Chemistry and materials Science and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhouGuangdong 510632China School of materials Science and engineering and Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhouGuangdong 510641China

Anode materials based on conversion reactions usually possess high energy densities for lithium-ion batteries(LIBs).However,they suffer from poor rate performance and cycle life due to serious volume ***,α/β-CoMo04 heterogeneous nanorods are synthesized via a facile co-precipitation method,and further are phase-engineered through varying calcination temperature,accomplishing the obviously improved cycle life and rate performance as anodes for *** evaluated at a current density of 1.0 A·g^(-1)the optimal nanorods with anα/βphase ratio of 6.0 afford the reversible capacity of 1143.6 mAh·g^(-1)after 200 cycles,outperforming most of recently reported bimetal ***^(+)storage mechanism is further analyzed by using in-situ X-ray diffraction and ex-situ transition electronic ***'s revealed thatβ-CoMoO_(4)follows a one-step conversion reaction;whileα-CoMo0_(4)proceeds an intercalation pathway before the conversion *** storage of Li^(+)would alleviate the volume effect of heterostructuredα/β-CoMo0_(4),forming electronically conductive network evenly composed of Co and Mo nanograins to enable the reversible electrochemical *** work is anticipated to give some hints for the rational design of high-performance energy materials.

关键词： Electrochemistry Anode materials Bimetal oxides Crystal engineering Reaction mechanisms

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HybridGAD: Identification of AI-Generated Radiology Abstracts Based on a Novel Hybrid Model with Attention Mechanism

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Computers, materials & Continua 2024年第8期80卷 3351-3377页

作者： TugbaÇelikten Aytug Onan Department of Software engineering Faculty of TechnologyManisa Celal Bayar UniversityManisa45140Turkey Department of Computer engineering Faculty of Engineering and ArchitectureIzmir KatipÇelebi UniversityIzmir35620Turkey

Class Title:Radiological imaging method a comprehensive overview *** GPT paper provides an overview of the different forms of radiological imaging and the potential diagnosis capabilities they offer as well as recent advances in the *** and Methods:This paper provides an overview of conventional radiography digital radiography panoramic radiography computed tomography and cone-beam computed *** recent advances in radiological imaging are discussed such as imaging diagnosis and modern computer-aided diagnosis ***:This paper details the differences between the imaging techniques the benefits of each and the current advances in the field to aid in the diagnosis of medical ***:Radiological imaging is an extremely important tool in modern medicine to assist in medical *** work provides an overview of the types of imaging techniques used the recent advances made and their potential applications.

关键词： Generative artificial intelligence AI-generated text detection attention mechanism hybrid model for text classification

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Investigations of a nanostructured FeMnSi shape memory alloy produced via severe plastic deformation

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International Journal of Minerals,Metallurgy and materials 2016年第11期23卷 1315-1322页

作者： Gheorghe Gurau Carmela Gurau Vedamanickam Sampath Leandru Gheorghe Bujoreanu Faculty of engineering "Dun?rea de Jos" University of Galati Department of metallurgical and materials engineering Indian Institute of Technology Madras Faculty of materials Science and engineering "Gheorghe Asachi" Technical University of Ia?i

Low-cost iron-based shape memory alloys（SMAs） show great potential for engineering applications. The developments of new processing techniques have recently enabled the production of nanocrystalline materials with improved properties. These developments have opened avenues for newer applications for SMAs. The influence of severe plastic deformation induced by the high-speed high-pressure torsion（HSHPT） process on the microstructural evolution of an Fe–Mn–Si–Cr alloy was investigated. Transmission electron microscopic analysis of the alloy revealed the existence of nanoscale grains with an abundance of stacking faults. The high density of dislocations characteristic of severe plastic deformation was not observed in this alloy. X-ray diffraction studies revealed the presence of ε-martensite with an HCP crystal structure and γ-phase with an FCC structure.

关键词： iorn manganese silicon alloys shape memory effect nanostructured materials martensite plastic deformation

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Yolk shell-structured pyrite-type cobalt sulfide grafted by nitrogen-doped carbon-needles with enhanced electrical conductivity for oxygen electrocatalysis

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Chinese Chemical Letters 2024年第7期35卷 212-217页

作者： Jiahao Xie Jin Liu Bin Liu Xin Meng Zhuang Cai Xiaoqin Xu Cheng Wang Shijie You Jinlong Zou Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China School of Chemical engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Pyrite-type sulfides(PTS)exhibit promising intrinsic activities for oxygen reduction and evolution reactions(ORR/OER).However,their poor electrical conductivities may limit the charge transfer rate to inevitably lower ***,yolk-shell structured cobalt-pyrite nanospheres(CoS_(2)YSS)are prepared and modified with amino groups as nucleation sites for coupling highly-conductive needle-like nitrogendoped carbon via a facile solvothermal method(CoS_(2)YSS@NC).The as-marked CoS_(2)YSS@NC-0.5 shows a gap between yolk and shell,and an obvious exterior layer of grafted NC,which can provide an integrated structure,an interior place,and three exposed surfaces on CoS_(2).CoS_(2)YSS@NC-0.5 reveals higher ORR activity(half-wave potential of 0.88 V)and methanol resistance than commercial Pt/*** to in-situ formation of highly-active CoOOH,CoS_(2)YSS@NC-0.5 shows a better overpotential(244 mV at 10 mA/cm^(2))and Tafel slope(135 mV/dec)than ***-air battery with CoS_(2)YSS@NC-0.5 air-cathode exhibits good open circuit potential(1.44 V),specific capacity(772.5 mAh/g)and cycling ***-like NC layer coated on the yolk-shell structure of CoS_(2)effectively lowers the charge transfer resistance to obtain extraordinary ORR/OER *** indicates that the integration of highly-conductive carbon onto pyritetype sulfides is an effective strategy to acquire durable bifunctional ORR/OER catalysts.

关键词： Cobalt sulfides Cycle stability Electrical conductivity Pyrite Yolk-shell structure

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Regulating surface electron structure of PtNi nanoalloy via boron doping for high‐current‐density Li‐O2 batteries with low overpotential and long‐life cyclability

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SmartMat 2024年第1期5卷 110-120页

作者： Yajun Ding Yuanchao Huang Yuejiao Li Tao Zhang Zhong‐Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina State Key Laboratory of Silicon materials and School of materials Science and engineering Zhejiang UniversityHangzhouChina Institute of Advanced Semiconductors Hangzhou Innovation CenterZhejiang UniversityHangzhouChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalianChina

The realization of high‐efficiency,reversible,stable,and safe Li‐O2 batteries is severely hindered by the large overpotential and side reactions,especially at high rate ***,rational design of cathode catalysts with high activity and stability is crucial to overcome the terrible issues at high current ***,we report a surface engineering strategy to adjust the surface electron structure of boron(B)‐doped PtNi nanoalloy on carbon nanotubes(PtNiB@CNTs)as an efficient bifunctional cathodic catalyst for high‐rate and long‐life Li‐O2 ***,the Li‐O2 batteries assembled with as‐prepared PtNiB@CNT catalyst exhibit ultrahigh discharge capacity of 20510 mA·h/g and extremely low overpotential of 0.48 V at a high current density of 1000 mA/g,both of which outperform the most reported Pt‐based catalysts ***,our Li‐O2 batteries offer excellent rate capability and ultra‐long cycling life of up to 210 cycles at 1000 mA/g under a fixed capacity of 1000 mA·h/g,which is two times longer than those of Pt@CNTs and PtNi@***,it is revealed that surface engineering of PtNi nanoalloy via B doping can efficiently tailor the electron structure of nanoalloy and optimize the adsorption of oxygen species,consequently delivering excellent Li‐O2 battery ***,this strategy of regulating the nanoalloy by doping nonmetallic elements will pave an avenue for the design of high‐performance catalysts for metal‐oxygen batteries.

关键词： B doping bifunctional catalyst Li‐O2 battery low charge overpotential PtNi nanoalloy

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具有增强界面稳定性的阻燃型电解液用于实际锂金属电池

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Science China materials 2024年第3期67卷 804-815页

作者：寇骁航张娇龙李朝林李如宏阮挺婷王文辉 School of materials Science and engineering&Research Institute of Interdisciplinary Science Dongguan University of TechnologyDongguan 523808China School of Civil and Environmental engineering Harbin Institute of TechnologyShenzhenShenzhen 518055China School of Biological and Chemical engineering Zhejiang University of Science and TechnologyHangzhou 310023China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China

开发匹配高电压正极的锂金属电池是实现高能量存储系统的关键.因此,研发可以同时为锂金属负极和高电压正极产生稳定界面相的先进电解液非常必要.LiNO_(3)作为高效的固体电解质界面相添加剂被广泛应用于醚基电解液中,然而其在碳酸脂类电... 详细信息

开发匹配高电压正极的锂金属电池是实现高能量存储系统的关键.因此,研发可以同时为锂金属负极和高电压正极产生稳定界面相的先进电解液非常必要.LiNO_(3)作为高效的固体电解质界面相添加剂被广泛应用于醚基电解液中,然而其在碳酸脂类电解液中的低溶解性严重限制了其在高压锂金属电池中的应用.本文利用磷酸三甲酯助溶剂提高LiNO_(3)在碳酸乙基甲酯/氟代碳酸乙烯酯电解液中的溶解度,并赋予电解液阻燃性能.此外,通过添加双草酸硼酸锂(LiBOB)进一步提高正负极的界面稳定性.结果表明,该电解液对锂金属负极和高电压层状氧化物正极均具有较高的兼容性.在2.8–4.3 V电压范围内,Li||LiCoO_(2)和Li||LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)电池在1.2 mA cm^(-2)电流密度下循环300周后的容量保持率分别为80.2%和84.2%.更令人惊喜的是,负/正极容量比为3.33的Li||NCM811电池在相同的充放电条件下循环150周后的容量保持率仍高达~80%.本论文对富含LiNO_(3)的阻燃型高压电解液的研究将为通过界面相调控研发安全的高比能锂金属电池提供理论指导.

关键词： Li metal anode high voltage cathode flame-retardant electrolyte solid electrolyte interphase

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metallurgical Interpretation on Grain Refinement and Synergistic Effect of Mn and Ti in Ti-microalloyed Strip Produced by TSCR

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Journal of Iron and Steel Research International 2014年第1期21卷 30-40页

作者： Xin-ping MAO Qi-lin CHEN Xin-jun SUN College of materials Science and metallurgical engineering Wuhan University of Science and Technology Institute of Structural materials Central Iron and Steel Research Institute

The grain refinement mechanism and synergistic effect of Mn and Ti involved in the Ti-microalloying technology of thin slab casting and direct rolling （TSCR） were elucidated. Because the inevitable precipitation of TiN in high Ti-containing liquid steel decreases the volume fraction of TiN precipitated from austenite and the rapid coarse- ning rate leads to a large size of TiN particles, a relatively weak inhibition effect on the recrystallized grain growth was obtained compared with that in the low Ti-containing steel. However, the ferrite grain size in high Ti-containing steel can be refined by the so-called non-recrystallization rolling. The complex addition of Mn and Ti can improve the strength and toughness of strip remarkably, and the mechanisms are that Mn decreases the transformation tempera- ture, refines the ferrite grains, and enhances the formation of bainite and TiC precipitation in ferrite.

关键词： thin slab casting direct roiling TSCR Ti-microalloying grain refinement precipitation

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