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STUDy ON THE EFFECTS OF BREAKAGE OF SINGLE FIBER ON CREEp BEHAVIOR OF FIBER REINFORCED COMpOSITES

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 498-502页

作者： X.J.Shao y.p.jiang Z.F.yue School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an710072 ChinaSchool of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an710072 ChinaSchool of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an710072 China

A 3-D micro cell model with multi-fibers has been presented to study the effects of breakage of single fiber on the whole creep behavior of fiber reinforced composites by finite element method (FEM). Before the fiber breakage, the stresses of all fibers are identical. With the creep time increasing, stress in fiber increases but stress in matrix decreases. It is assumed that the fiber breakage occurs when the stress in fiber reaches a critical value. The stress redistribution resulted from the breakage of fiber has been obtained. The influence on the axial stress of the broken fiber is local. The stress in the all fiber sections is not uniform. There is a local stress concentration in the matrix. And this stress concentration in the matrix is more and more serious with the creep deformation. The stress transference of the loading due to the fiber breakage has been studies numerically. It is found that the fibers near to the broken fiber will take over more loading.

关键词： fiber reinforced composites breakage of fiber stress redistribution loading transference

pb-DOpING EFFECTS ON THE DIELECTRIC AND pyROELECTRIC pROpERTIES OF(Sr,pb)TiO_(3)SySTEM

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Journal of Advanced Dielectrics 2012年第1期2卷 78-85页

作者： y.p.jiang X.G.TANG y.C.ZHOU Q.X.LIU Key Laboratory of Low Dimensional Materials and Application Technology Xiangtan University Xiangtan 411105P.R.China School of physics&Optoelectric Engineering Guangdong University of Technology Guangzhou Higher Education Mega Center Guangzhou 510006 P.R.China

Lead strontium titanate(Sr_(1-x)pbx)TiO_(3)(0.20≤x≤0.45,step=0.05)ceramics were prepared by conventional mixed oxide *** X-ray diffraction patterns indicate that the prepared samples have perovskite-type *** the increase of pb content,there is a tendency from the cubic to tetragonal *** scanning electron microscopy micrographs reveal that the addition of pb can affect *** dependent temperature dielectric permittivity and dielectric loss were investigated in the frequency range from 100 Hz to *** maximum peak of the dielectric permittivity versus temperature curve was broadened and a frequency dispersion of the dielectric permittivity was observed for the(Sr_(0.8)pb_(0.2))TiO_(3)*** results obtained at the frequency of 10 kHz reveal the Curie temperature linearly increased with the lead *** curves of temperature versus inverse dielectric permittivity at 10 kHz for(Sr_(1-x)pbx)TiO_(3)ceramics are consistent with Curie-Weiss *** pyroelectric properties were also *** high pyroelectric coe±cients andfigure of merits indicate that the SpT ceramics are potential materials for pyroelectric sensors.

关键词： (Sr_(1-x)pbx)TiO_(3)(SpT)ceramics dielectric properties Curie temperature CurieWeiss law pyroelectric properties

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用纳米压痕法测量电沉积镍镀层的力学性能

湘潭大学自然科学学报 2005年第3期27卷 50-58页

作者：蒋艳平赵冠湘潘勇周益春先进材料及其流变特性教育部重点实验室湘潭大学广东工业大学物理与光电工程学院广东广州510090 湖南科技大学物理学院湘潭大学材料与光电物理学院湖南湘潭411105

随着科学技术的发展和薄膜材料的广泛应用,对于薄膜材料的性能的研究已经越来越引起人们的重视,尤其是其力学性能.因此,着重对电沉积镍涂层中的力学性能如硬度和杨氏模量等进行了研究.首先介绍了用纳米压痕的方法测量薄膜的硬度与杨氏... 详细信息

随着科学技术的发展和薄膜材料的广泛应用,对于薄膜材料的性能的研究已经越来越引起人们的重视,尤其是其力学性能.因此,着重对电沉积镍涂层中的力学性能如硬度和杨氏模量等进行了研究.首先介绍了用纳米压痕的方法测量薄膜的硬度与杨氏模量的原理和方法,然后对电沉积后未经处理、经真空热处理和激光处理的样品进行了载荷-深度曲线的测试.结果表明,经过真空热处理的样品硬度明显减小,而经激光处理后的样品的硬度比未经处理的样品要高. 同时,对于同一样品,加不同的载荷导致压痕深度不同,随着压痕深度的增加其测得的硬度值和杨氏模量值都会有明显的下降.

关键词：电沉积镍镀层纳米压痕法硬度杨氏模量

Hierarchical Control Strategy for Load Regulation Based on Stackelberg Game Theory Considering Randomness

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CSEE Journal of power and Energy Systems 2024年第3期10卷 929-941页

作者： Tingyu jiang ping Ju C.y.Chung yuzhong Gong College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China Department of Electrical Engineering City University of Hong KongHong Kong CF624China Department of Electrical and Computer Engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada CSEE IEEE

Demand response has been recognized as a valuable functionality of power systems for mitigating power *** paper proposes a hierarchical control strategy among the distribution system operator(DSO),load aggregators(LAs),and thermostatically controlled loads(TCLs);the strategy includes a scheduling layer and an executive layer to provide load *** the scheduling layer,the DSO(leader)offers compensation price(Cp)strategies,and the LAs(followers)respond to Cp strategies with available regulation power(ARp)*** of the DSO and LAs are modeled according to their behaviors during the load regulation *** game is adopted to capture interactions among the players and leader and to obtain the optimal strategy for each participant to achieve ***,considering inevitable random factors in practice,e.g.,renewable generation and behavior of users,two different stochastic models based on sample average approximation(SAA)and parameter modification are formulated with improved scheduling *** the executive layer,distributed TCLs are triggered based on strategies determined in the scheduling layer.A self-triggering method that does not violate user privacy is presented,where TCLs receive external signals from the LA and independently determine whether to alter their operation *** simulations are performed on the modified IEEE-24 bus system to verify effectiveness of the proposed strategy.

关键词： Demand response hierarchical control load regulation self-triggering method Stackelberg game

Assembly of peptide nanostructures with controllable sizes

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Nano Research 2024年第1期17卷 151-161页

作者： Dan Cheng Fan Jia yun-Bao jiang Vincent p.Conticello Tao jiang The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian province(IKKEM) Xiamen 361005China Department of Chemistry Emory UniversityAtlanta 30033USA

Controlled peptide assembly offers significant promise to develop synthetic supramolecular nanostructures to display material and biological properties that mimic protein assemblies in *** the progress in forming peptide nanostructures of various morphology,there exists a distinct gap between natural and synthetic assembly systems in terms of size *** nanostructures with a narrow size distribution that can be tuned over a wide range of length-scales is essential for applications that require precise spacing between *** approach provides the opportunity to correlate materials and biological properties of interest with assembly *** this review,we discuss representative endeavors over the past two decades for design of size-controllable peptide nanostructures using tunable building *** mechanisms for size control,e.g.,molecular frustration,template-directed peptide assembly,and multi-component peptide co-assembly,will also be *** also demonstrate the applicable scopes of these strategies and suggest potential future avenues for scientific advances in this field.

关键词： peptide assembly controllable size template multi-component

An improved initial rotor position estimation method using high-frequency pulsating voltage injection for pMSM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： yang jiang Ming Cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination

Capturing plateau-Rayleigh instability in silver nanowires via ultrafast electron microscopy

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Nano Research 2024年第9期17卷 8402-8407页

作者： Shuai jiang Volkan Ortalan Department of Materials Science and Engineering University of ConnecticutStorrsCT 06269USA

Understanding the structural stability of nanomaterials such as nanowires is imperative for their practical ***,using single-shot ultrafast transmission electron microscopy,we captured the plateau-Rayleigh instability behavior of silver nanowires decomposing into silver nanoparticles upon laser irradiation on nanosecond time *** found that this dynamic process can be accelerated by a factor of 10 through increasing the peak laser fluence from 6.03 to 14.60 mJ/cm^(2).Moreover,by comparing the laser fluence required to initiate the plateau-Rayleigh instability in silver nanowires on carbon and Formvar membranes,it was found that the main driving force for the plateau-Rayleigh instability in this study was substrate *** element analysis and molecular dynamics simulations are also applied to estimate the temperature jump of the nanowires and atomistic behavior,*** addition,the complex motions of silver nanowires under laser irradiation were systematically investigated by combining the results of ultrafast transmission electron microscopy with scanning electron microscopy characterizations and were determined to be related to nanowire-membrane interactions or pre-existing stresses on the nanowires,which in turn demonstrated the potential of ultrafast transmission electron microscopy for the characterization of nanomaterials and devices under extreme conditions.

关键词： silver nanowire plateau-Rayleigh instability ultrafast transmission electron microscopy molecular dynamics simulation

Drug-Target Interactions prediction Based on Signed Heterogeneous Graph Neural Networks

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Chinese Journal of Electronics 2024年第1期33卷 231-244页

作者： Ming CHEN yajian jiang Xiujuan LEI yi pAN Chunyan JI Wei jiang College of Information Science and Engineering Hunan Normal University School of Computer Science Shaanxi Normal University Faculty of Computer Science and Control Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences Computer Science Department BNU-HKBU United International College

Drug-target interactions(DTIs) prediction plays an important role in the process of drug *** computational methods treat it as a binary prediction problem, determining whether there are connections between drugs and targets while ignoring relational types information. Considering the positive or negative effects of DTIs will facilitate the study on comprehensive mechanisms of multiple drugs on a common target, in this work, we model DTIs on signed heterogeneous networks, through categorizing interaction patterns of DTIs and additionally extracting interactions within drug pairs and target protein pairs. We propose signed heterogeneous graph neural networks(SHGNNs), further put forward an end-to-end framework for signed DTIs prediction, called SHGNN-DTI,which not only adapts to signed bipartite networks, but also could naturally incorporate auxiliary information from drug-drug interactions(DDIs) and protein-protein interactions(ppIs). For the framework, we solve the message passing and aggregation problem on signed DTI networks, and consider different training modes on the whole networks consisting of DTIs, DDIs and ppIs. Experiments are conducted on two datasets extracted from Drug Bank and related databases, under different settings of initial inputs, embedding dimensions and training modes. The prediction results show excellent performance in terms of metric indicators, and the feasibility is further verified by the case study with two drugs on breast cancer.

关键词： Drugs Training proteins Measurement Message passing prediction methods Graph neural networks

Advances in Triboelectric Nanogenerators for Blue Energy Harvesting and Marine Environmental Monitoring

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Engineering 2024年第2期33卷 204-224页

作者： yang jiang Xi Liang Tao jiang Zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro–Nano Energy and SensorsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Georgia Institute of Technology AtlantaGA 30332USA

Blue energy,which includes rainfall,tidal current,wave,and water-flow energy,is a promising renewable resource,although its exploitation is limited by current technologies and thus remains *** form of energy is mainly harvested by electromagnetic generators(EMGs),which generate electricity via Lorenz force-driven electron *** nano genera tors(TENGs)and TENG networks exhibit superiority over EMGs in low-frequency and high-entropy energy harvesting as a new approach for blue energy harvesting.A TENG produces electrical outputs by adopting the mechanism of Maxwell’s displacement *** date,a series of research efforts have been made to optimize the structure and performance of TENGs for effective blue energy harvesting and marine environmental *** the great progress that has been achieved in the use of TENGs in this context so far,continuous exploration is required in energy conversion,device durability,power management,and environmental *** review reports on advances in TENGs for blue energy harvesting and marine environmental *** introduces the theoretical foundations of TENGs and discusses advanced TENG prototypes for blue energy harvesting,including TENG structures that function in freestanding and contact-separation *** enhancement strategies for TENGs intended for blue energy harvesting are also ***,marine environmental applications of TENGs based on blue energy harvesting are discussed.

关键词： Triboelectric nanogenerator TENG networks Blue energy Energy harvesting Ocean sensors