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Modeling and optimization of a spherical triboelectric generator

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Nano Research 2023年第9期16卷 11925-11931页

作者： Jens Gravesen Morten Willatzen Jiajia Shao zhong lin Wang DTU Compute Technical University of DenmarkKgs.LyngbyDK-2800Denmark Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China Georgia Institute of Technology AtlantaGeorgia 30332USA

A detailed geometric analysis of spherical triboelectric nanogenerators is *** comparison with earlier works on spherical triboelectric generators,the general case where the moving dielectric rolls on the inside surface of the larger sphere of the TENG is discussed in terms of maximum energy *** optimization analysis of geometrical parameters allows various cases of electrode geometry,either in the form of a spherical circle,spherical ellipse,spherical rectangle,or spherical isosceles trapezium,to be *** analytical insight and computational effective models provided by differential geometry make the mathematical model superior compared to standard three-dimensional(3D)numerical methods.

关键词： spherical triboelectric nanogenerator differential geometry analysis electrode shape study modeling and optimization

Thermoelectric properties of (GeTe)_(1-x)[(Ag_(2)Te)_(0.4)(Sb_(2)Te_(3))_(0.6)]_(x) alloys

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Rare Metals 2022年第3期41卷 921-930页

作者： Hong-Xia Liu Xin-Yue Zhang zhong-lin Bu Wen Li Yan-zhong Pei School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Laboratory of Magnetic and Electric Functional Materials and the Applications The Key Laboratory of Shanxi ProvinceTaiyuan 030024China Interdisciplinary Materials Research Center School of Materials Science and EngineeringTongji UniversityShanghai 201804China

The(GeTe)_(x)(AgSbTe_(2))_(100-x)alloys(TAGS-x)have been demonstrated as a promising p-type candidate for thermoelectric applications,attracting numerous atten-tions on the advancements of thermoelectric *** of carrier concentration for optimizing ther-moelectric performance in TAGS can be achieved by varying the ratio of Ag to Sb,and the Ag/Sb ratio of~2/3 has been proven as the optimal ***,this work focuses on the systematic investigation on ther-moelectric properties of(GeTe)_(1-x)[(Ag_(2)Te)_(0.4)(Sb_(2)Te_(3))_(0.6)]_(x) *** crystal structure for the alloys transfers from rhombohedral to cubic at room temperature as x≥*** evolution of band parameter is estimated using a single parabolic band(SPB)model with acoustic phonon *** density of states effective mass increases with x increasing,which leads to an enhancement of Seebeck coefficient along with a reduction in Hall mobility due to the additional carrier scattering by point ***-while,the lattice thermal conductivity of lower than~0.7 W·m^(-1)·K^(-1) in the entire temperature range and the lowest one of only 0.45 W·m^(-1)·K^(-1) is achieved due to additional phonon scattering by point *** a result,a peak thermoelectric figure of merit(zT)of~1.80 and an average one of~1.37 in 300–800 K are realized in non-stoichiometric TAGS alloys here.

关键词： Thermoelectric Tellurium-antimonygermanium-silver(TAGS) Crystal structure Lattice thermal conductivity

基于连续小波变换估测干旱胁迫下玉米籽粒产量

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作物学报 2024年第4期50卷 1030-1042页

作者：邹佳琪王仲林谭先明陈燎原杨文钰杨峰四川农业大学农学院/农业农村部西南作物生理生态与耕作重点实验室/四川省作物带状复合种植工程技术研究中心四川成都611130 四川农业大学水稻研究所四川成都611130

利用高光谱遥感技术监测作物水分状况和籽粒产量,对于调控作物生长、优化水分管理和改善产量形成具有重要意义。本研究玉米品种选用正红505,于2018—2019年在四川雅安和仁寿的试验田设置4个水分处理(正常水分、轻度、中度和重度干旱),... 详细信息

利用高光谱遥感技术监测作物水分状况和籽粒产量,对于调控作物生长、优化水分管理和改善产量形成具有重要意义。本研究玉米品种选用正红505,于2018—2019年在四川雅安和仁寿的试验田设置4个水分处理(正常水分、轻度、中度和重度干旱),分析玉米在拔节期(V6)、抽雄期(VT)和灌浆期(R^(2))的冠层含水量(canopy water content,CWC)与籽粒产量的定量关系,利用植被指数和连续小波变换对光谱反射率数据进行处理,采用线性回归方法构建CWC定量反演模型,进一步探索以CWC为桥梁建立的玉米籽粒产量的预测模型效果。结果表明,(1)利用小波特征构建的CWC估测模型的预测效果高于植被指数,V6、VT和R^(2)期分别以小波特征gaus3770,64、rbio3.31635,2和rbio3.3838,2构建的线性回归模型检验精度较高,R^(2)分别为0.770、0.291和0.233。(2)CWC与玉米籽粒产量间建立的线性回归模型均达极显著水平(P<0.01),V6、VT和R^(2)期的R^(2)分别为0.596、0.366和0.439。(3)基于光谱反射率构建的产量预测模型以V6期小波特征gaus3770,64的验证效果最好(R^(2)=0.577,RMSE=1.625 t hm^(–2)),可作为预测玉米籽粒产量的最佳时期。因此,本研究提出的“光谱反射率—冠层含水量—产量”建模方法能够实现对玉米籽粒产量的精确估测,为未来大面积监测玉米生产力提供了理论依据。

关键词：玉米籽粒产量冠层含水量植被指数小波特征

基于多组分定量联合主成分分析正交偏最小二乘法-判别分析及熵权优劣解距离法的抗菌消炎胶囊质量差异性评价

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中国药物与临床 2024年第12期24卷 749-755,F0003页

作者：施丹萍沈敏俞振伟钟琳浙江中医药大学附属江南医院杭州市萧山区中医院药学部浙江杭州311201 浙江大学医学院附属邵逸夫医院药剂科浙江杭州311201

目的建立主成分分析(PCA)、正交偏最小二乘法-判别分析(OPLS-DA)及熵权优劣解距离法(EW-TOPSIS)评价抗菌消炎胶囊的多组分质量差异。方法采用高效液相色谱法(HPLC)同时测定15批抗菌消炎胶囊中獐牙菜苦苷、獐牙菜苷、绿原酸、3,5-二-O-... 详细信息

目的建立主成分分析(PCA)、正交偏最小二乘法-判别分析(OPLS-DA)及熵权优劣解距离法(EW-TOPSIS)评价抗菌消炎胶囊的多组分质量差异。方法采用高效液相色谱法(HPLC)同时测定15批抗菌消炎胶囊中獐牙菜苦苷、獐牙菜苷、绿原酸、3,5-二-O-咖啡酰奎宁酸、知母皂苷BⅡ、知母皂苷AⅢ、原百部碱、对叶百部碱、黄芩苷、汉黄芩苷、黄芩素和汉黄芩素的含量,借助PCA、OPLS-DA及EW-TOPSIS模型对15批消炎胶囊样品进行质量差异分析,筛选出导致差异的特征成分,并进行质量排序。结果12种成分在各自范围内呈现良好的线性关系(r>0.999),平均加样回收率(n=9)96.90%~100.23%(RSD<2.0%)。化学计量学筛选出2个主成分,方差贡献率累计达95.172%;OPLS-DA发掘出黄芩苷、绿原酸、知母皂苷BⅡ和对叶百部碱对抗菌消炎胶囊质量有显著影响;EW-TOPSIS分析结果显示Ci值0.0827~0.8495,15批样品质量差异较大。结论所建立的方法可用于抗菌消炎胶囊质量的综合评价。

关键词：色谱法,高压液相主成分分析最小二乘法分析抗菌消炎胶囊

神圣的复归?——电子木鱼的文化阐释与“叙魅”逻辑

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未来传播 2024年第3期31卷 59-69,133页

作者：林仲轩吕梓剑暨南大学新闻与传播学院广东广州510632

鉴于“求神拜佛”现象在青年圈层的风靡,文章以“电子木鱼”为例,依托“释魅循环”的理论视角,通过半结构式访谈,对电子木鱼的实践动机、文化意义及其魅化路径展开解读。文章经研究发现,作为传统木鱼的数字化身,电子木鱼寄托着人们朝圣... 详细信息

鉴于“求神拜佛”现象在青年圈层的风靡,文章以“电子木鱼”为例,依托“释魅循环”的理论视角,通过半结构式访谈,对电子木鱼的实践动机、文化意义及其魅化路径展开解读。文章经研究发现,作为传统木鱼的数字化身,电子木鱼寄托着人们朝圣祈愿、净化罪恶、疗养身心的功效,这彰显了一定的返魅迹象。然而,其仍旧是商业催生的消费产品,存有信仰工具化、娱乐化和商业化的叙魅基因。鉴于此,基于将“自我”指称“神灵”的借代考量,文章提出“借魅”的概念,以概括电子木鱼展露的介于祛魅和返魅之间的魅化现象。同时,文章还尝试修正“释魅循环”的理论模型,认为祛魅到再魅的过程并不体现为一种“闭环”。经由赋魅或借魅,它也许是一种波浪式的前进,也可能会在交替中被逐渐抹杀。

关键词：电子木鱼祛魅返魅释魅循环

临海富水地层大直径盾构隧道管片上浮机制及控制措施

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公路交通科技 2024年第1期41卷 138-151页

作者：曾红波石州涂金光徐金峰肖中林中交二公局第一工程有限公司湖北武汉430000 同济大学岩土及地下工程教育部重点实验室上海200092 同济大学土木工程学院上海200092 中交海峡建设投资发展有限公司福建福州350000

为了探明临海富水复杂地层中大直径盾构隧道管片上浮机制并采取相应的控制措施,以福州滨海快线地铁项目为工程依托,建立了盾构机-管片-浆液-地层多因素耦合作用数值计算模型,分析了不同浆液压力分布形式下浆液-管片相互作用模式及管片... 详细信息

为了探明临海富水复杂地层中大直径盾构隧道管片上浮机制并采取相应的控制措施,以福州滨海快线地铁项目为工程依托,建立了盾构机-管片-浆液-地层多因素耦合作用数值计算模型,分析了不同浆液压力分布形式下浆液-管片相互作用模式及管片上浮机制,之后通过浆液配比室内试验和现场实际应用筛选获得了壁后浆液的最佳材料配比,并进行了壁后注浆工艺改进。结果表明:浆液压力分布形式的变化对盾尾后第1环管片的上浮位移影响最大,外部浆液压力分布形式的变化对于管片上部和下部的上浮位移差影响较大,而对两侧部位的影响较小;管片下部浆液压力分布形式的改变对于靠近盾尾的相邻两环管片环间错台影响最大,管片上部浆液压力较大时,管片结构各处的轴力和弯矩整体较小,管片上部负弯矩分布范围及下部负轴力值较小;浆液水胶比和胶砂比的增加会使得浆液的稠度、流动度和初凝时间随之增加,但是粉水比却与上述3个物理指标间存在显著的负相关特性;每立方米浆液拌制过程中加入5 kg减水剂,台车砂浆罐内拌入0.5 kg速凝剂,管片上部2个注浆孔注射入40%的浆液,中部和下部两个注浆孔分别注射入30%的浆液,同时在脱出盾尾后的管片上部开孔快速注入水玻璃,能显著降低管片上浮位移。

关键词：隧道工程变形数值计算盾构隧道管片上浮控制措施

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基于单目SLAM稀疏特征的避障方法

计算机工程与设计 2024年第6期45卷 1735-1742页

作者：江明曾碧刘建圻彭泽鑫林中文广东工业大学计算机学院广东广州510006

为在使用单目相机的低成本移动机器人上实现避障,提出一种基于现有单目SLAM系统生成的稀疏特征的可通行区域检测方法。通过使用单目SLAM生成的稀疏地标点标识障碍物,根据环境信息恢复构建三维体素地图,生成二维栅格代价地图。为解决单目... 详细信息

为在使用单目相机的低成本移动机器人上实现避障,提出一种基于现有单目SLAM系统生成的稀疏特征的可通行区域检测方法。通过使用单目SLAM生成的稀疏地标点标识障碍物,根据环境信息恢复构建三维体素地图,生成二维栅格代价地图。为解决单目SLAM中尺度不明确的问题,提出一种基于视觉-轮式编码器的尺度求解器。通过直接使用机器人已有的SLAM框架生成的地标点,在降低系统整合成本同时降低计算量。实验结果表明,在KITTI和DRE数据集上构图的耗时在10 ms~20 ms,可以很好满足在性能受限的设备上的实时避障需求。

关键词：单目视觉同步定位与地图构建代价地图可通行区域避障稀疏特征尺度恢复

Isolation and bioactivity screening of soy isoflavones from soybean glycolipids identifies daidzin as a promising anti-inflammatory agent

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Traditional Medicine Research 2024年第3期9卷 1-9页

作者： Xiao-Chuan Fang Xue-Mei He Yuan-Ru Zheng Wen Li Tang-Jia Yang Jing-Tao Yu Jun-Le Li Zi-Zhe Cai Yong Wang lin-zhong Yu Jun-Shan Liu Third Level Research Laboratory of State Administration of Traditional Chinese Medicine Guangdong Provincial Key Laboratory of Chinese Medicine PharmaceuticsSchool of Traditional Chinese MedicineSouthern Medical UniversityGuangzhou 510515China Guangdong Saskatchewan Oilseed Joint Laboratory Department of Food Science and EngineeringJinan UniversityGuangzhou 510632China Institute of Biomedical Engineering College of Life Science and TechnologyJinan UniversityGuangzhou 510632China Department of Pharmacy Zhujiang HospitalSouthern Medical UniversityGuangzhou 510515China

Background:Soybean has long been utilized in the realm of traditional Chinese *** of its extracts,soybean glycolipids,serves as a vital by-product of soybean oil refining,but its chemical composition and pharmacological potential have yet to be fully ***:In this study,the chemical components were isolated,and the inhibitory effects of these isolates were explored in different zebrafish inflammatory models by survival rate,Histological examination assay and quantitative Real-time PCR *** cytotoxicity of daidzin in RAW264.7 cells was evaluated by cell viability assay,and the effect of daidzin on the release of inflammatory cytokines in RAW264.7 cells was detected by enzyme linked immunosorbent assay(ELISA).Western blotting,immunofluorescence assay and alpha7 nicotinic acetylcholine receptors siRNA transfection assay were used to further explore the anti-inflammatory mechanism of ***:Four compounds(verticilloside,soya-cerebroside I,soya-cerebroside II and daidzin)were firstly isolated from the soybean glycolipids,among which verticilloside and daidzin inhibited the lipopolysaccharide,CuSO4-and tail cut-stimulated zebrafish ***,daidzin exhibited anti-inflammatory activities by increasing the survival rate,alleviating the inflammatory cells infiltration,and down-regulating the expression of pro-inflammatory cytokines and nuclear factor kappa-B,NF-kappa-B inhibitor alpha,and signal transducer and activator of transcription3 in ***,daidzin decreased the secretion of IL-6 and TNF-α,inhibited the nuclear translocations of nuclear factor kappa-B p65 and p-signal transducer and activator of transcription3 as well as the NF-kappa-B inhibitor alpha phosphorylation at Ser32 in RAW 264.7 *** importantly,it elevated the expression level of alpha7 nicotinic acetylcholine receptors in both zebrafish and RAW 264.7 cells,and the inhibitory effect of daidzin was attenuated after the addition of alpha7 ni

关键词： soybean daidzin anti-inflammation zebrafish α7nAchR

Ultralight Iontronic Triboelectric Mechanoreceptor with High Specific Outputs for Epidermal Electronics

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Nano-Micro Letters 2022年第6期14卷 1-14页

作者： Hai Lu Wang Zi Hao Guo Xiong Pu zhong lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400People’s Republic of China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004People’s Republic of China CUSTech Institute of Technology Wenzhou 325024ZhejiangPeople’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The pursuit to mimic skin exteroceptive ability has motivated the endeavors for epidermal artificial *** mechanoreceptors are required to be highly sensitive to capture imperceptible skin deformations and preferably to be self-powered,breathable,lightweight and deformable to satisfy the prolonged wearing *** is still struggling to achieve these traits in single device,as it remains difficult to minimize device architecture without sacrificing the sensitivity or *** this article,we present an all-fiber iontronic triboelectric mechanoreceptor(ITM)to fully tackle these challenges,enabled by the high-output mechano-to-electrical energy *** proposed ITM is ultralight,breathable and stretchable and is quite stable under various mechanical *** the one hand,the ITM can achieve a superior instantaneous power density;on the other hand,the ITM shows excellent sensitivity serving as epidermal *** health status monitoring is readily implemented by the ITM calibrating by detecting vital signals and physical activities of human *** ITM can also realize acoustic-to-electrical conversion and distinguish voices from different people,and biometric application as a noise dosimeter is *** ITM therefore is believed to open new sights in epidermal electronics and skin prosthesis fields.

关键词： Ultralight Iontronic Triboelectric mechanoreceptor Power density Epidermal electronics