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Bi-material strip based temperature sensor design and optimization through thermo-mechanical multi-physics modeling

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International Journal of Smart and Nano Materials 2019年第1期10卷 1-10,I0001页

作者： Baobao Tang Sarah Kathryn Collings Hai Xiao huijuan zhao Department of Mechanical Engineering Clemson UniversityClemsonSCUSA Holcombe Department of Electrical and Computer Engineering Clemson UniversityClemsonSCUSA

With the capability of additive manufacturing,complex structures are easily fabricated to achieve various design purposes.In this work,a bi-material strip temperature sensor with complex periodic pattern design is purposed and investigated through both the analytical modeling and multi-physics finite element analysis.Three design patterns are considered:standard,E-shape and S-shape.In the standard solid strip design,the curvature of the bi-material strip under temperature variation is in a linear relationship with the coefficient of thermal expansion(CTE)difference,but in a reciprocal relationship with the strip thickness.The curvature of the bi-material strip depends on the Young’s modulus ratio and layer thickness ratio of the two materials,but is independent of the magnitude of the materials’Young’s modulus.Based on analytical derivation and numerical validation,the optimized design parameters can be provided.Compared to S-shape pattern design,E-shape pattern design can significantly increase the temperature sensitivity of the bi-material strip.An analytical prediction of the E-shape pattern’s temperature sensitivity is introduced and discussed.This work proves the concept that new design space becomes available with the capability of additive manufacturing,and provides the general design guideline for a bi-material strip based temperature sensor with possible design patterns.

关键词： Bi-material temperature sensing optimization finite element analysis

A versatile nano-TiO_(2) decorated gel separator with derived multi-scale nanofibers towards dendrite-blocking and polysulfide-inhibiting lithium-metal batteries

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Journal of Energy Chemistry 2021年第4期30卷 190-201页

作者： huijuan zhao jing Yan Nanping Deng Weimin Kang Bowen Cheng State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes Tiangong UniversityTianjin 300387China School of Textile Science and Engineering Tiangong UniversityTianjin 300387China

In this study,a versatile fluorine-bearing gel membrane with multi-scale nanofibers was rationally designed and synthesized via facile one-step blend electrospinning of nano-titanium dioxide(TiO_(2))particles and fluorinated poly-m-phenyleneisophthalamide(PMIA)polymer solution.The prepared multiscale TiO_(2)-assisted gel separator presented relatively high porosity,small aperture,giving rise to superior affinity to electrolyte and sufficient active sites to accelerate lithium ions migration.Meanwhile,the asfabricated multifunctional GPE also rendered outstanding heat-resistance and well-distributed lithiumions flux,and the mutual overlaps between the coarse fibers and the fine fibers within the multi-scale nanofiber membrane provided a strong skeleton support,which in turn laid a solid footing stone for high-security and dendrite-proof batteries.Particularly,the nano-TiO_(2) particles within PMIA membrane acted as"gatekeepers",which can not only resist the growth of lithium dendrites,but also intercept the dissolved polysulfide on cathode side.Based on these merits,the gel PMIA-based lithium cobalt(LCO)/lithium battery obtained the remarkably improved rate capability and cycle performances on account of superior ionic conductivity,steady anodic stability window and weakened polarization behavior.Meanwhile,the resultant lithium-sulfur cell also delivered the outstanding cycling stability with the aid of the greatly prevented"shuttle effect"of dissolved lithium polysulfides based on the physical trapping and chemical binding of the prepared GPE to polysulfides species.This work proved that the addition of functional inorganic nanoparticles similar with TiO_(2) in multi-scale gel PMIA membrane can enhance the lithium ions transport capability,resist the growth of lithium dendrites as well as inhibit the shuttle effect of polysulfides,which would prompt a great development for dendrite-blocking and polysulfideinhibiting lithium-metal cells.

关键词： Versatile gel polymer electrolyte Multi-scale nanofibers Thermostability Dendrite-blocking and polysulfide-inhibiting Lithium-metal batteries

A review on electronically conducting polymers for lithium-sulfur battery and lithium-selenium battery:Progress and prospects

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Journal of Energy Chemistry 2021年第7期30卷 523-556页

作者： Hengying Xiang Nanping Deng huijuan zhao Xiaoxiao Wang Liying Wei Meng Wang Bowen Cheng Weimin Kang State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes Tiangong UniversityTianjin 300387China School of Textile Science and Engineering Tiangong UniversityTianjin 300387China

Lithium-sulfur(Li-S) batteries and lithium-selenium(Li-Se) batteries,as environmental protection energy storage systems with outstanding theoretical specific capacities and high energy densities,have become the hotspots of current researches.Besides,elemental S(Se) raw materials are widely sourced and their production costs are both low,which make them considered one of the new generations of high energy density electrochemical energy storage systems with the most potential for development.However,poor conductivity of elemental S/Se and the notorious "shuttle effect" of lithium polysulfides(polyselenides) severely hinder the commercialization of Li-S/Se batteries.Thanks to the excellent electrical conductivity and strong absorption of lithium polysulfide(polyselenide) about electronically conducting polymer,some of the above thorny problems have been effectively alleviated.The review presents the fundamental studies and current development trends of common electronically conducting polymers in various components of Li-S/Se batteries,which involves polyaniline(PANI) polypyrrole(PPy),and polythiophene(PTh) with its derivatives,e.***.polyethoxythiophene(PEDOT) and poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS).Finally,the review not only summarizes the research directions and challenges facing the application of electronically conducting polymers,but also looks forward to the development prospects of them,which will provide a way for the practical use of electronically conducting polymers in Li-S/Se batteries with outstanding electrochemical properties in the short run.

关键词： Li-S/Se batteries Electronically conducting polymer Various battery components Suppressed"shuttle effect" Outstanding electrochemical properties

Characterization of CsWRKY29 and CsWRKY37 transcription factors and their functional roles in cold tolerance of tea plant

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Beverage Plant Research 2022年第1期2卷 116-128页

作者： huijuan zhao Ali Inayat Mallano Fangdong Li Penghui Li Qiong Wu Yanli Wang Yunze Li Naveed Ahmad Wei Tong Yeyun Li Zhengzhu Zhang Enhua Xia State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural UniversityHefei 230036China Institute of Crop Germplasm Resources Shandong Academy of Agricultural SciencesJinan 250100China

The WRKY gene family is most widely known as being the key plant transcription factor family involved in various stress responses and affecting plant growth and development.In this study,a total of 86 members of the CsWRKY genes were identified from the tea plant genome.Most of these genes contain several important Cis-regulatory elements in the promoter regions associated with multiple stress-responses.These genes were further classified into three groups,I,II,and III,each with 21,58,and 7 members,respectively.We showed evidence that tandem duplications,but not the whole genome duplication,are likely to drive the amplification of CsWRKY genes in tea plants.All the 86 CsWRKY genes showed differential expression patterns either in different tissues,or under exposure to diverse abiotic stresses such as drought,cold acclimation,and MeJA treatments.Additionally,the functional roles of two genes,CsWRKY29 and CsWRKY37,were examined under cold stress;and the silencing of these genes resulted in tea plant phenotypes susceptible to cold stress.Moreover,transgenic Arabidopsis lines overexpressing CsWRKY29 and CsWRKY37 genes showed higher survival rates and lower malondialdehyde levels under freezing treatment than the wild type plants.The core findings from this work provide valuable evolutionary pattern of WRKY gene family and underpinning the underlying regulatory roles of CsWRKY29 and CsWRKY37 from tea plants that conferred cold tolerance in transgenic Arabidopsis plants.

关键词： functional Arabidopsis treatment

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汽车制造企业数字化转型能力评估体系构建

科技和产业 2024年第10期24卷 115-122页

作者：刘璐赵慧娟青岛科技大学经济与管理学院山东青岛266061

进行数字化转型是汽车制造企业顺应市场发展的重要手段,诸多汽车制造企业对自身数字化转型能力的认知不足导致其数字化转型进程较慢,通过分析不同车企的数字化转型特点,从内、外两个维度对影响其数字化转型能力的因素进行研究,明确评价... 详细信息

进行数字化转型是汽车制造企业顺应市场发展的重要手段,诸多汽车制造企业对自身数字化转型能力的认知不足导致其数字化转型进程较慢,通过分析不同车企的数字化转型特点,从内、外两个维度对影响其数字化转型能力的因素进行研究,明确评价指标,采用AHP法对指标进行赋权,发现数字化设备设施及数字技术应用是影响汽车制造企业数字化转型能力的主要因素,为其进行数字化转型提供理论参考。

关键词：数字化转型能力汽车制造企业数字化设施设备数字技术应用

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基于四行精密播种的玉米直播机设计与试验

农机化研究 2024年第1期46卷 141-145页

作者：赵会娟尹小定池成忠济源职业技术学院机电工程系河南济源454650 江西机电职业技术学院机械工程学院南昌330013 太原理工大学材料科学与工程学院太原030024

为了解决播种玉米种子精度低的问题,设计了一款基于四行精密播种的玉米直播机,可实现玉米种子快速、精准播种。试验表明:该玉米直播机移动性能好、播种速度快、种植深度和每穴种子数量更加准确,封土情况也大幅改善,符合设计需求,具有较... 详细信息

为了解决播种玉米种子精度低的问题,设计了一款基于四行精密播种的玉米直播机,可实现玉米种子快速、精准播种。试验表明:该玉米直播机移动性能好、播种速度快、种植深度和每穴种子数量更加准确,封土情况也大幅改善,符合设计需求,具有较高的可靠性和可行性。

关键词：玉米四行精密播种直播机快速精准

拉考沙胺单药治疗对局灶性癫痫合并抑郁患儿外周血IL-6及5-HT表达的影响

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徐州医科大学学报 2024年第6期44卷 442-446页

作者：赵惠娟戴园园徐州医科大学附属医院儿科江苏徐州221002

目的探讨拉考沙胺单药治疗对局灶性癫痫合并抑郁患儿外周血白细胞介素-6(IL-6)及5-羟色胺(5-HT)表达的影响。方法选择2022年6月—2023年1月就诊于徐州医科大学附属医院且初次诊断为局灶性癫痫的12~18岁青少年,进行汉密尔顿抑郁量表(HAMD... 详细信息

目的探讨拉考沙胺单药治疗对局灶性癫痫合并抑郁患儿外周血白细胞介素-6(IL-6)及5-羟色胺(5-HT)表达的影响。方法选择2022年6月—2023年1月就诊于徐州医科大学附属医院且初次诊断为局灶性癫痫的12~18岁青少年,进行汉密尔顿抑郁量表(HAMD)评分。将评分≥8分(有抑郁倾向)的患儿纳入研究,并采集患儿外周血测定IL-6及5-HT含量,共116例,分为2组,拉考沙胺组53例,口服拉考沙胺,奥卡西平组63例,口服奥卡西平。治疗6个月及12个月后进行随访,观察癫痫控制总有效率、HAMD评分、外周血IL-6及5-HT水平和药物不良反应发生情况。结果拉考沙胺组治疗6个月癫痫控制总有效率为64.71%,与奥卡西平组相比,差异无统计学意义(P>0.05);拉考沙胺组治疗12个月癫痫控制总有效率为89.13%,高于奥卡西平组,差异有统计学意义(P0.05)。拉考沙胺组治疗6个月、12个月后HAMD评分、IL-6水平低于治疗前,5-HT水平高于治疗前,差异有统计学意义(P<0.05)。拉考沙胺组治疗12个月后不良反应发生率为15.09%,低于奥卡西平组,差异有统计学意义(P<0.05)。结论拉考沙胺单药治疗青少年局灶性癫痫合并抑郁可有效控制癫痫发作,改善患儿抑郁症状,可能与降低IL-6及升高5-HT有关,且不良反应发生率较低。

关键词：青少年局灶性癫痫拉考沙胺抑郁白细胞介素-6 5-羟色胺

Theoretical investigations of electrical transport properties in CoSb3 skutterudites under hydrostatic loadings

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Rare Metals 2018年第4期37卷 316-325页

作者： Chongze Hu Peter Ni Li Zhan huijuan zhao Jian He Terry M. Tritt Jingsong Huang Bobby G. Sumpter Department of Mechanical Engineering Clemson UniversityClemson SC 29634 USA Department of Mechanical Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 USA Montgomery High School Skillman NJ 08558 USA Department of Physics and Astronomy Clemson UniversityClemson SC 29634 USA Center for Nanophase Materials Sciences and ComputationalSciences and Engineering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA

CoSb3-based mark mid-temperature skutterudites have been a benchthermoelectric material under intensive experimental and theoretical studies for decades. Doping and filling, to the first order, alter the crystal lattice constant of CoSb3 in the context of ＂chemical pressure.＂ In this work, we employed ab initio density functional theory in conjunction with semiclassical Boltzmann transport theory to investigate the mechanical properties and especially how hydrostatic loadings, i.e., ＂physical pressure,＂ impact the electronic band structure, Seebeck coefficient, and power factor of pristine CoSb3. It is found that hydrostatic pressure enlarges the band gap, suppresses the density of states （DOS） near the valence band edge, and fosters the band convergence between the valley bands and the conduction band minimum （CBM）. By contrast, hydrostatic tensile reduces the band gap, increases the DOS near the valence band edge, and diminishes the valley bands near the CBM. Therefore, applying hydrostatic pressure provides an alternative avenue for achieving band convergence to improve thermoelectric properties of N-type CoSb3, which is further supported by our carrier concentration studies. These results provide valuable insight into the further improvement of thermoelectric performance of CoSb3-based skutterudites via a synergy of physical and chemical pressures.

关键词： CoSb3 skutterudite Hydrostatic loadingsMechanical properties Electronic structure Seebeckcoefficient Thermoelectrics

基于CNN-NLSTM的脑电信号注意力状态分类方法

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中文信息学报 2024年第4期38卷 38-49页

作者：沈振乾李文强任甜甜王瑶赵慧娟天津工业大学电子与信息工程学院天津300387 天津工业大学生命科学学院天津300387

通过脑电信号进行注意力状态检测,对扩大脑-机接口技术的应用范围具有重要意义。为了提高注意力状态的分类准确率,该文提出一种基于CNN-NLSTM的脑电信号分类模型。首先采用Welch方法获得脑电信号的功率谱密度特征并将其表示为二维灰度... 详细信息

通过脑电信号进行注意力状态检测,对扩大脑-机接口技术的应用范围具有重要意义。为了提高注意力状态的分类准确率,该文提出一种基于CNN-NLSTM的脑电信号分类模型。首先采用Welch方法获得脑电信号的功率谱密度特征并将其表示为二维灰度图像。然后使用卷积神经网络从灰度图像中学习表征注意力状态的特征,并将相关特征输入到嵌套长短时记忆神经网络依次获得所有时间步骤的注意力特征。最后将两个网络依次连接来构建深度学习框架进行注意力状态分类。实验结果表明,该文所提出的模型通过进行多次5-折交叉验证评估后得到89.26%的平均分类准确率和90.40%的最大分类准确率,与其他模型相比具有更好的分类效果和稳定性。

关键词：注意力状态脑电信号卷积神经网络嵌套长短时记忆神经网络功率谱密度