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High-performance flexible self-powered strain sensor based on carbon nanotube/ZnSe/CoSe_(2) nanocomposite film electrodes

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Nano Research 2022年第1期15卷 170-178页

作者： Qiufan Wang Jiaheng Liu Xuan Ran Daohong Zhang Guozhen shen Menghe Miao Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science Hubei R&D Center of Hyperbranched Polymers Synthesis and ApplicationsSchool of Chemistry and Materials ScienceSouth Central University for NationalitiesWuhan 430074China State Key Laboratory for Superlattices and Microstructures Institution of SemiconductorsChinese Academy of SciencesBeijing 100083China CSIRO Manufacturing 75 Pigdons RoadWaurn PondsVictoria 3216Australia

High-performance energy storage and sensing devices have been undergoing rapid development to meet the demand for portable and wearable electronic products,which require flexibility,extensibility,small volume and *** this study,we construct a lightweight and flexible self-powered sensing system by integrating a highly stretchable strain sensor with a high-performance asymmetric supercapacitor based on ZnSe/CoSe_(2)//ECNT(ECNT:electrochemically activated carbon nanotube film).The ZnSe/CoSe_(2) two-dimentional nanosheets on carbon nanotube(CNT)films are synthesized through a simple and efficient strategy derived from ZnCo-based metal-organic frameworks(MOFs).The density functional theory(DFT)simulations show the higher conductivity of the ZnSe/CoSe_(2)/CNT electrode than the CoSe_(2)/CNT *** to the synergistic properties of self-supported two-dimentional ZnSe/CoSe_(2) nanosheets with high specific surface area and the high pathway of one-dimention CNTs,the nanocomposite electrode provides efficient transmission and short paths for electron/ion *** asymmetric supercapacitor provides a stable output power supply to the sensors that can precisely respond to strain and pressure *** sensor can also be attached to a garment for measuring a variety of joint movements.

关键词： asymmetric supercapacitor sensors self-powered self-supported ZnSe/CoSe_(2)/carbon nanotube(CNT)nanosheets density functional theory

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Numerical evaluation of the ground response induced by dewatering in a multi-aquifer system

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Geoscience Frontiers 2021年第5期12卷 384-396页

作者： Yong-Xia Wu Qian Zheng Annan Zhou Shui-Long shen College of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China Department of Civil and Environmental Engineering College of EngineeringShantou UniversityShantouGuangdong 515063China Civil and Infrastructure Engineering School of EngineeringRoyal Melbourne Institute of Technology(RMIT)Victoria 3001Australia MOE Key Laboratory of Intelligent Manufacturing Technology College of EngineeringShantou UniversityShantouGuangdong 515063China

This study presents a numerical investigation of dewatering-induced settlement and wall deflection during pumping tests in Tianjin,*** on the measured groundwater head and building settlement during the pumping test,a three-dimensional liquid-solid coupling model is established by using the finite element method(FEM).The void ratio,hydraulic conductivity,and elastic modulus of each layer are back-calculated through the numerical *** groundwater drawdown,seepage field,ground settlement,horizontal ground displacement,and diaphragm wall lateral deflection are analyzed using the FEM *** simulated results demonstrate that(i)the maximum ground settlement outside of the excavation reaches to 82 mm due to the leakage effect of aquitards;(ii)large horizontal displacement occurs in the soil during the pumping test with a maximum value of 28.3 mm,and the installation of the diaphragm wall in the aquifer can reduce the horizontal displacement of the ground;(iii)long-term pumping causes a large lateral deflection of the diaphragm wall,and a maximum value of 23.2 mm occurs at the layer where the screens of the wells are located;and(iv)long-term large-scale pumping should be avoided before excavation.

关键词： Excavation pit Pumping test Settlement Wall deflection Numerical simulation

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Oxide dispersion strengthened stainless steel 316L with superior strength and ductility by selective laser melting

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Journal of Materials Science & Technology 2020年第7期42卷 97-105页

作者： Yuan Zhong Leifeng Liu Ji Zou Xiaodong Li Daqing Cui zhijian shen Department of Materials and Environmental Chemistry Arrhenius LaboratoryStockholm UniversitySE-10691 StockholmSweden School of Metallurgy and Materials University of BirminghamB152TT UK Department of Chemistry-Radiochemistry P.O.Box 55FI-00014 University of HelsinkiFinland

Dense oxide dispersion strengthened(ODS) 316 L steels with different amount of Y2O3 additions were succe s s fully fabricated by selective laser melting(SLM) even though part of the added Y2O3 got lost during the *** microstructure was characterized in details and the mechanical properties were tested at room temperature,250℃ and 400℃,*** effect of the scanning speed on agglomeration of nanoparticles during SLM process was *** properties,e.g.,yield strength of 574 MPa and elongation of 91%,were achieved at room temperature in SLM ODS 316 L with additional 1% of Y2 *** elevated temperature s,the strength kept high but the elongations dropped dra *** was observed that nano-voids nucleated throughout the whole gauge section at the sites where nanoinclusions *** growth and coalescence of these voids were suppre s sed by the formation of an element segregation network before necking,which relieved local stress concentration and thus delayed *** unusual necking behavior was studied and compared to the previous *** appeared that the strong convection presented in the melt pool can evenly redistribute the short-time milled coarse Y2O3 precursor powder during SLM *** findings can not only solve the problems encountered during the fabrication of ODS components but also replenish the strengthening mechanism of SLM 316 L thus pave a way for further improving of mechanical properties.

关键词： ODS steel Selective laser melting(SLM) Elevated-temperature properties Necking Strain hardening

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母体基础疾病状况对子痫前期发病的影响

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中华妇产科杂志 2012年第6期47卷 405-411页

作者：沈洁杨孜王伽略北京大学第三医院妇产科 100191

目的探讨母体合并内科疾病等子痫前期临床风险因素对子痫前期发病的影响，旨在提高和强化围孕期早期评估和识别高危人群的能力。方法回顾性分析2008年11月至2011年1月间在北京大学第三医院住院的、合并内科疾病的子痫前期患者97例（M—P... 详细信息

目的探讨母体合并内科疾病等子痫前期临床风险因素对子痫前期发病的影响，旨在提高和强化围孕期早期评估和识别高危人群的能力。方法回顾性分析2008年11月至2011年1月间在北京大学第三医院住院的、合并内科疾病的子痫前期患者97例（M—PE组）及无内科疾病的单纯子痫前期患者203例（***组）的临床资料，并分别与同期合并内科疾病未发生子痫前期孕妇183例及无内科疾病正常妊娠孕妇203例进行对比。结果2008年11月至2011年1月本院子痫前期总体病例中，存在多胎及合并内科疾病等子痫前期临床风险因素者占43．1％（159／369）；单胎妊娠中合并内科疾病者子痫前期发生率明显高于无内科合并症者，分别为15．0％（97／646）、4．45％（210／4719），两者比较，差异有统计学意义（P〈0．05）；单胎妊娠子痫前期中合并内科疾病者占32．3％（97／300）。M—PE组孕妇比I-PE组的平均年龄[分别为（31．7±4．5）、（29．3±5．2）岁]、高龄孕妇比例[分别为29％（28／97）、17．7％（36／203）]、既往有子痫前期史孕妇比例[分别为11％（11／97）、4．9％（10／203）]、中晚孕期妊娠丢失史比例[分别为11％（11／97）、3．0％（6／203）]及早孕期体质指数（BMI）[分别为（26．0±5．6）、（23．3±3．7）kg/m2]、高BMI孕妇比例[分别为62％（18／29）、33％（18／55）]均明显增高，分别比较，差异均有统计学意义（P〈0．05）。***组比I-PE组诊断孕周中位数提前（分别为32．9、34．4周），发病孕周在32周之前者[分别为45％（44／97）、34．0％（69／203）]、在34周之前者[分别为54％（52／97）、45．8％（93／203）]及在孕32周前发生的重症病例所占比例[分别为45％（44／97）、34．O％（69／203）]均增加，分别比较，差异均有统计学意义（P〈0．05）。以32孕周为界，I—PE组早发型患者平均早孕期BMI低于晚发型[分别为（20．9±2．0）、（23．4±3．8）kg/m2，P=0．269]。以32孕周为早发型界定值，合并内科疾病是早发型子痫前期发病的独立影响因素（OR=1．718，95％CI为1．005～2．937，P=0．048）；无论以32孕周或34孕周界定早发型与晚发型，多因素回归分析显示，中晚孕期妊娠丢失史及不规律产前检查均是早发型子痫前期发病的独立影响因素（P均〈0．05）。结论存在内科疾病及多胎妊娠的子痫前期患者在同期子痫前期发生总人群中超过1／3；存在内科疾病的子痫前期患者其子痫前期发病孕周较早，是不容忽视的高危人群。单纯型子痫前期早发型患者早孕期BMI低于晚发型，早发型与晚发型子痫前期存在BMI方面的差异，提示两者可能存在母体异质性和不同的发病机制。中晚孕期妊娠丢失史及不规律产前检查均是早发型子痫前期发病的影响因素．府强化包括潜在内科疾病在内的临床风险因素的早期评估和产前检杏。

关键词：子痫前期危险因素高血压糖尿病,妊娠肾小球肾炎甲状腺疾病

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Construction of hierarchical functional nanomaterials for energy conversion and storage

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Particuology 2020年第1期18卷 34-47页

作者： Jianhua shen Yu Wang Kailun Gu Yihua Zhu Yanjie Hu Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Hierarchical functional nanomaterials have important applications in the fields of new energy and the environment because of performance advantages based on the coupling and collaboration of multilevel *** key to application is the design and control of the mesoscale structures,such as the crystal-facet structure,lattice orientation,defects,and *** this review,we present the controlled synthesis of novel semiconductor oxide and carbon-based nanocomposites with three-dimensional hierarchical structures by the multiphase-reaction *** describe several typical reaction processes,such as the gas-phase flame-combustion method,the vapor-phase deposition technique,and the solid-liquid interface reaction process,to investigate the properties of fluid flow,mixing,transport,and chemical *** also study the formation mechanism,structural evolution and control methods for hierarchical nanomaterials by using combined experimental and simulation *** well-designed and prepared hierarchical functional materials can be used in energy storage and conversion *** information is provided for the structural design and performance control of new functional nanocomposites.

关键词： Mesoscale structure Hierarchical nanostructure Structure-performance relationship Energy storage Energy conversion

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Magnetic behaviors and magnetocaloric effects in rare earth high-entropy amorphous/nanocrystalline alloys

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Journal of Rare Earths 2024年第1期42卷 129-136,I0005页

作者： Lin Xue Liliang Shao Baosen Zhang Zongzhen Li Jiangbo Cheng Baolong shen College of Mechanics and Materials Hohai UniversityNanjing211106China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing211189China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167China Jiangsu JITRI Advanced Energy Materials Research Institute Co. Ltd.Changzhou213000China

Rare earth high-entropy alloys(RE-HEAs)exhibit great potential to be applied as refrigerants due to their good comprehensive magnetocaloric *** this work,octary GdTbDyHoErTmCoAl and GdTbDyHoErTmCoNi RE-HEAs with amorphous/nanocrystalline structure exhibiting comparable magnetocaloric effect were *** RE-HEAs show a second-order magnetic phase transition in the temperature range of hydrogen *** to the complex magnetic interactions,a spin glasslike behavior at low temperatures is observed in the RE-HEAs.A superior magnetocaloric effect is obtained in the nanocrystalline GdTbDyHoErTmCoNi high-entropy alloy that is multiphase attributed to a stronger magnetic exchange interaction when compared with the other that exhibits single amorphous *** heterogeneous microstructure,homogeneous chemical distributions are observed in the partially crystallized high-entropy *** addition,the magnetocaloric effect and magnetic transition behavior of rare earth medium-and high-entropy alloys,including the RE-HEAs in this study,are summarized and *** results in this work provide a helpful guide for the design of RE-HEAs for hydrogen liquefaction applications with excellent magnetocaloric effects.

关键词： Rare earths High-entropy alloy Metallic glass Magnetocaloric effect

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Reevaluation of the Holotype of Odorrana schmackeri Boettger,1892(Amphibia:Anura:Ranidae) and Characterization of One Cryptic Species in *** sensu lato through Integrative Approaches

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Asian Herpetological Research 2020年第4期11卷 297-311页

作者： Huijun shen Yanjun ZHU Zhen LI Zhuo CHEN Xiaohong CHEN College of Life Sciences Henan Normal UniversityXinxiang 453007HenanChina

The Odorrana schmackeri sensu la to is a group of cascade frogs that are widely distributed in southern ***,their taxonomy has long been unresolved and several cryptic species have been reported in the past *** analyses revealed the existence of three sympatrie species(i.c,***,*** and ***2) at the type locality of ***(Gaojiayan Town,Yichang City,Hubei Province,China).However,the lack of an original description for the holotype specimen(SMF6241) of *** poses a confusing and controversial problem in species nomination within this ***,we reevaluate the taxonomic affinities of SMF6241 and examine the distinctness of ***2 based on specimens from the type *** use integrative approaches that combine morphology with 10 microsatellite loci and *** discriminant analysis of morphological characteristics revealed three distinct groupings(i.e.,***,*** and ***2) and attributed SMF6241 to *** clustering analysis of nuclear DNA also identified three corresponding *** addition,analysis of interspecific variation in morphometrics and acoustics showed divergence between ***2 and its sympatric *** lines of evidence from morphological,molecular and bioacoustic approaches suggest the species status of ***2,namely Odorrana ichangensis Chen,***,this study resolves the taxonomic assignment of the holotype of *** and provides an example for species delimitation using integrative approaches.

关键词： integrative taxonomy new species Odorrana ichangensis Chen sp.nov. Odorrana schmackeri sensu lato reevaluation

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Efficient stochastic successive cancellation list decoder for polar codes

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Science China(Information Sciences) 2020年第10期63卷 133-151页

作者： Xiao LIANG Huizheng WANG Yifei shen Zaichen ZHANG Xiaohu YOU Chuan ZHANG Laboratory of Efficient Architectures for Digital-communication and Signal-processing (LEADS) Southeast University National Mobile Communications Research Laboratory Southeast University Quantum Information Center of Southeast University

Polar codes are one of the most favorable capacity-achieving codes owing to their simple structures and low decoding complexity. Successive cancellation list(SCL) decoders with large list sizes achieve performances very close to those of maximum-likelihood(ML) decoders. However, hardware cost is a severe problem because an SCL decoder with list size L consists of L copies of a successive cancellation(SC)decoder. To address this issue, a stochastic SCL(SSCL) polar decoder is proposed. Although stochastic computing can achieve a good hardware reduction compared with the deterministic one, its straightforward application to an SCL decoder is not well-suited owing to the precision loss and severe latency. Therefore,a doubling probability approach and adaptive distributed sorting(DS) are introduced. A corresponding hardware architecture is also developed. Field programmable gate array(FPGA) results demonstrate that the proposed stochastic SCL polar decoder can achieve a good performance and complexity tradeoff.

关键词： SCL polar decoder stochastic computing 2-bit decoding distributed sorting hardware

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Effects of flashing green on driver's stop/go decision at signalized intersection

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Journal of Central South University 2015年第2期22卷 771-778页

作者：沈家军王炜 College of Civil Science and Engineering Yangzhou University School of Transportation Southeast University

The primary objective of this work is to explore how drivers react to flashing green at signalized intersections. Through video taping and data procession based on photogrammetry, the operating speeds of vehicles before and after the moment when flashing green started was compared using paired-samples T-test. The critical distances between go and stop decisions was defined through cumulative percentage curve. The boundary of dilemma zone was determined by comparing stop distance and travel ***-running violation was analyzed on the basis of the travel time to the stop line. And finally, a logistic model for stop and go decisions was constructed. The results shows that the stopping ratios of the first vehicles of west-bound and east-bound approaches are 41.3% and 39.8%, respectively; the amber-light running violation ratios of two approaches are 31.6% and 25.4%, respectively;the operating speed growth ratios of first vehicles selecting to cross intersection after the moment when flashing green started are26.7% and 17.7%, respectively; and the critical distances are 48 m and 46 m, respectively, which are close to 44 m, the boundary of dilemma zone. The developed decision models demonstrate that the probability of go decision is higher when the distance from the stop line is shorter or operating speed is higher. This indicates that flashing green is an effective way to enhance intersection safety,but it should work together with a strict enforcement. In addition, traffic signs near critical distance and reasonable speed limitation are also beneficial to the safety of intersections.

关键词： signalized intersections flashing green critical distance dilemma zone amber-running violation logistic decision model

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Natural fractures within unconventional reservoirs of Linxing Block,eastern Ordos Basin,central China

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Frontiers of Earth Science 2020年第4期14卷 770-782页

作者： Wei Ju Jian shen Chao Li Kun Yu Hui Yang Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou221116China Key Laboratory of Computational Geodynamics College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing100049China

Unconventional reservoirs are generally characterized by low matrix porosity and permeability,in which natural fractures are important factors for gas *** this study,we analyzed characteristics of natural fractures,and their influencing factors based on observations from outcrops,cores and image *** orientations of natural fractures were mainly in the∼N-S,WNW-ESE and NE-SW directions with relatively high fracture dip *** densities were calculated based on fracture measurements within cores,indicating that natural fractures were not well-developed in the Benxi-Upper Shihezi Formations of Linxing *** majority of natural fractures were open fractures and *** to the characteristics of fracture sets and tectonic evolution of the study area,natural fractures in the Linxing Block were mainly formed in the Yanshanian and Himalayan *** lithology and layer thickness influenced the development of natural fractures,and more natural fractures were generated in carbonate rocks and thin layers in the study *** addition,in the Linxing Block,natural fractures with∼N-S-trending strikes contributed little to the overall subsurface fluid flow under the present-day stress *** study results provide a geological basis for gas exploration and development in the Linxing unconventional reservoirs of Ordos Basin.

关键词： natural fracture unconventional reservoir Linxing region influencing factors Ordos Basin

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