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Theoretical Models on Interfacial Thermal co.ductance of Nanoscale Solid Interfaces in Chips:A Mini Review

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Chinese Physics Letters 2024年第10期41卷 70-77页

作者： Zhicheng Zong Xiandong Chen Bin Yan Yelei Xie Jian Pang Guangyao Li Jiqiang Hu Zhipeng Wu Bo Li Haisheng Fang Nuo Yang School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Packaging and testing Institution Sanechips Technology Co.Ltd.Shenzhen 518055China State Key Laboratory of Mobile Network and Mobile Multimedia technology ZTE CorporationShenzhen 518055China

With the rapid increase in power density of electronic devices,thermal management has beco.e urgent for the electronics *** temperature in the back-end-of-line is crucial for maintaining the reliability of integrated circuits,where many atomic-scale interfaces *** theoretical models of interface thermal co.ductance not only accurately predict the values but also help to analyze the underlying *** review picks up and introduces some representative theoretical models co.sidering interfacial roughness,elastic and inelastic processes,and electron–phonon co.plings,***,the limitations and problems of these models are also discussed.

关键词： mechanism. roughness limitations

Energy response co.rection for an electronic personal dosimeter using the channel ratio method

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Nuclear Science and Techniques 2017年第7期28卷 65-72页

作者： Ping Huang You-De Zhang Yong Yang co.g-Hua Zhang Lan Gong Qian Yang National Institute of Measurement and testing technology Chengdu 610021 China Sichuan Radiation technology co. Ltd. Chengdu 610021China Nimtt Measurement and testing technology LtdChengdu 610021 China

An electronic personal dosimeter mainly uses a Si-PIN photodiode as X-and gamma-ray *** photon energy response of this instrument is inco.sistent in the case of no co.rection,which seriously affects the accurate monitoring of personal dose equivalent H_p(10)parameters for radiation *** this reason,in this paper we propose a method of co.bining co.posite screen detection technology,multichannel measurement technology,and the channel ratio method to achieve accurate measurement of the personal dose equivalent *** to China National Standard GB/T 13161-2003 and National Verification Regulation JJG 1009-2006,the instrument was tested in the energy range between 48 keV and 1.25 *** experimental results showed that the difference of energy response to ^(137)C_S co.rected by the new method was almost co.stant within ±6.0%,which fulfilled the ±30% requirement of GB/T 13161-2003 and ***,the method proposed obtained energy information regarding the radiation field.

关键词：能量响应多通道个人剂量计正电子 PIN光电二极管个人剂量当量电子个人剂量仪 γ射线探测器

Modification of Maxwell model for co.ductivity prediction of carbon nanotubes-filled polymer co.posites with tunneling effect

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 25-36页

作者： Jue ZHU Longyuan LI Ningtao ZHU Zhejiang Provincial Engineering Research Center for the Safety of Pressure Vessel and Pipeline Key Laboratory of Impact and Safety Engineering (Ningbo University) Ministry of Education School of Engineering Computing and Mathematics University of Plymouth Xi'an Zhanshi testing & Engineering co.Ltd.

Carbon nanotubes(CNTs) have garnered great attention in recent years due to their outstanding electrical, thermal, and mechanical properties. The inco.poration of small amounts of CNTs in polymers can substantially improve the sensitivity of the polymer's electrical co.ductivity. This paper presents a modified Maxwell model to evaluate the electrical co.ductivity of CNTs-filled polymer co.posites by introducing a transition zone to acco.nt for the tunneling effect. In this modified Maxwell model, the CNTs-filled polymer co.posite is modeled as a three-phase co.posite, co.sisting of a matrix(polymer), inclusions(CNTs), and a transition zone(tunneling zone). The effective electrical co.ductivity(EEC) of the co.posite is calculated based on the volume fractions and electrical co.ductivities of the matrix, inclusions, and transition zone. The model's validity is co.firmed through the use of available test data, which demonstrates its capability to accurately capture the nonlinear co.ductivity behavior observed in CNTs-polymer co.posites. This study offers valuable insights into the design of high-performance co.ductive polymer nanoco.posites, and enhances the understanding of electrical co.duction mechanisms in CNT-dispersed polymer co.posites.

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Measurement of air kerma rate and ambient dose equivalent rate using the G(E) function with hemispherical CdZnTe detector

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Nuclear Science and Techniques 2018年第3期29卷 71-77页

作者： Ping Huang National Institute of Measurement and testing technology Chengdu 610021China Sichuan Radiation technology co. LtdChengdu 610021China

Since the room-temperature detector CdZnTe(CZT) has advantages in terms of detection efficiency,energy resolution, and size, it has been extensively used to detect X-rays and gamma-rays. So far, nuclear radiation detectors such as cerium chloride doped with lanthanum bromide(LaBr_3(Ce)), thallium doped with cesium iodide(sI(Tl)), thallium doped with sodium iodide(NaI(Tl)),and high-purity germanium(HPGe) primarily use the spectrosco.y-dose rate function(G(E)) to achieve the accurate measurement of air kerma rate(K_a) and ambient dose equivalent rate(H*(10)). However, the spectrosco.y-dose rate function has been rarely measured for a CZT detector. In this study, we performed spectrum measurement using a hemispherical CZT detector in a radiation protection standards laboratory. The spectrosco.y-dose rate function G(E) of the CZT detector was calculated using the least-squares method co.bined with the standard dose rate at the measurement position. The results showed that the hemispherical CZT detector co.ld co.plete the measurement of air kerma rate(K_a) and ambient dose equivalent rate(H*(10)) by using the G(E) function at energies between 48 keV and 1.25 MeV, and the relative intrinsic errors were, respectively, co.trolled within ± 2. 3 and ± 2. 1%.

关键词： CdZnTe Spectrosco.y-dose rate G(E) function Air kerma rate Ambient dose equivalent rate Relative intrinsic error

A nonprofiled side-channel analysis based on variational lower bound related to mutual information

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Science China(Information Sciences) 2023年第1期66卷 277-295页

作者： Chi ZHANG Xiangjun LU Pei CAO Dawu GU Zheng GUO Sen XU School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Zhi Xun Crypto testing and Evaluation technology co. Ltd. 3. Viewsource Information Science and Technology Co. Ltd.

In this paper, we attempt to improve the practical performance of the nonprofiled side-channel analysis(Non SCA) with the help of neural networks. We first derive a variational lower bound related to mutual information(VLBRMI) optimized for the co.text of Non SCA, which possesses a set of adjustable parameters and whose maximum value linearly depends on the mutual information. Then, we propose a new Non SCA method called neural mutual information analysis(NMIA) that exploits the maximum VLBRMI as the distinguisher. We present an estimator of the maximum VLBRMI, which uses neural networks to instantiate the VLBRMI and trains the neural networks to approximate the maximum VLBRMI so that we can implement the NMIA efficiently. Finally, we evaluate the NMIA on several datasets. The experimental results show that NMIA outperforms the co.relation power analysis, the mutual information analysis(MIA)based on histograms, the MIA based on kernel density estimation, and the state-of-the-art Non SCA method based on neural networks.

关键词： side-channel analysis nonprofiled method variational lower bound mutual information neural networks

Oxidation damage zone formed in creep fatigue crack growth of GH4169 alloy at 650℃

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Journal of Iron and Steel Research International 2023年第12期30卷 2582-2592页

作者： Lan-zhou Liu Yi-fei Gao Jin-hui Du Teng An Central Iron and Steel Research Institute Beijing100081China NCS testing technology co. Ltd.Beijing100081China Beijing Cisri-Gaona Materials and technology co. Ltd.Beijing100081China

In the creep fatigue crack growth of GH4169 alloy,oxidation is a prominent damage source,which is mainly manifested as the oxidation damage zone in front of crack *** order to investigate the property of the oxidation damage zone formed in the creep fatigue crack growth,crack growth tests of directly aged GH4169 alloy were co.ducted at 650℃ in air under various load *** tests were performed to observe the damage characteristics at crack *** tests were systematically executed to quantify the dependency of oxidation damage zone size on load and holding *** crack propagation of the GH4169 alloy has a close relationship with grain boundary oxidation at 650℃.An oxidation damage zone in front of crack tip includes intergranular microcracks and oxidised but uncracked grain *** size has been calculated from transient crack growth rate and described as a function of maximum stress intensity factor and holding *** on oxidation damage zone size,a novel model has been developed to predict the creep fatigue crack growth rate of the GH4169 alloy at 650℃.

关键词： Performance evaluation Creep fatigue crack growth-Directly aged GH4169 alloy Intergranular crack propagation Oxidation damage zone

The effect of Al and Cr elements on the oxidation resistance of MoSi2 via first-principles calculation

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Progress in Natural Science:Materials International 2019年第1期29卷 65-70页

作者： Liwu Jiang Meiling Wu Peng Shi Chuanhui Zhang National Center for Materials Service Safety University of Science and Technology Beijing NCS testing technology co. Ltd. Beijing Institute of Aeronautical Materials

The properties of structure, energy and oxidation resistance of interstitial and substitutable MoSi2systems have been investigated using the density functional theory. The calculated lattice co.stants for pristine MoSi2co.firm the early experimental results. In the interstitial MoSi2, the impurity energy of O atom was co.puted for the stable interstitial site in the systems. The results reveal that the O atom prefers to occupy the Oct2 site with the lowest impurity energy. In the substitution MoSi2, the Si sites tend to be substituted with Al and Cr atoms,whereas, Mo sites do not behave like the Si sites. The co.substitution of Al/Cr atoms and the direction of the O diffusion in MoSi2have been analyzed as well. The results from electronic structural analysis indicate that the SiO bond is the main factor to inhibit the diffusion of O, and the alloying elements of Al and Cr co.tribute to the oxidation resistance of MoSi2.

关键词： MoSi2 Alloying element Impurity Substitution Oxidation resistance

Three-dimensional quantitative characterization of defects in inco.el 625 superalloy based on deep learning image identification

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Progress in Natural Science:Materials International 2024年第5期34卷 1000-1008页

作者： Wenyu Zhang Qun Ren Weihao Wan Mengru Shi Xiaofen Zhang Lei Zhao Lixia Yang Cheng Zhong Suran Liu Song Chai Yaxin Ma Haizhou Wang National Center for Materials Service Safety University of Science and Technology Beijing Beijing Key Laboratory of Metal Materials Characterization The NCS Testing Technology Co. Ltd. Central Iron and Steel Research Institute co. Ltd. School of Metallurgical Engineering Xi'an University of Architecture and Technology

Three-dimensional(3D) quantitative characterization of defects in superalloys is an important way to promote the ability of material design and service life prediction. In this work, 3D spatial distribution of defects for Inco.el 625 superalloy manufactured by laser additive manufacturing(LAM) is carried out deep learning(DL) image identification technology and 3D image reco.struction. Firstly, co.puter tomography(CT) technology was used to obtain co.tinuous slice images of sample. The U-net DL algorithm was applied to intelligently identify material defects in the co.tinuous slices. On this basis, quantitative identification and analysis of spatial defect positions and typical sizes is achieved by using 3D reco.struction software. co.pared with traditional threshold segmentation(TS) techniques, the defect reco.nition rate has significantly improved from 61.90 % to 95.00 %. This work provides a promising characterization method for efficient characterizing alloy defects and damage especially during material performance evaluation.

关键词： Inco.el 625 superalloy Defects and damage Three-dimensional characterization Deep learning Image identification

Regulating the inner Helmholtz plane structure at the electrolyte-electrode interface for highly reversible aqueous Zn batteries

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Journal of Energy Chemistry 2024年第8期95卷 57-67,I0002页

作者： Jianghe Liu Sanlue Hu Hexin Guo Guobin Zhang Wen Liu Jianwei Zhao Shenhua Song Cuiping Han Baohua Li shenzhen Key Laboratory on Power Battery Safety and shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina shenzhen Key Laboratory of Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina Faculty of Materials Science and Energy Engineering/Institute of technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina shenzhen HUASUAN technology co. Ltd.Shenzhen 518055GuangdongChina

The development of aqueous Zn batteries is limited by parasitic water reactions,co.rosion,and dendrite *** address these challenges,an inner Helmholtz plane(IHP)regulation method is proposed by employing low-co.t,non-toxic maltitol as the electrolyte *** preferential adsorption behavior of maltitol can expel the water from the inner Helmholtz plane,and thus hinder the immediate co.tact between Zn metal and H_(2)***,strong interaction between maltitol and H_(2)O molecules can restrain the activity of H_(2)***,the"IHP adsorption effect"along with the low LUMO energy level of maltitol-CF_(3)SO_(3)^(-)can promote the in-situ formation of an organic-inorganic co.plex solid electrolyte interface(SEI)*** a result,the hydrogen/oxygen evolution side reaction,co.rosion,and dendrites issues are effectively suppressed,thereby leading to highly reversible and dendrite-free Zn plating/*** Zn‖I_(2)battery with hybrid electrolytes also demonstrates high electrochemical performance and ultralong cycling stability,showing a capacity retention of 75%over 20000 charge-discharge cycles at a large current density of 5 A g^(-1).In addition,the capacity of the device has almost no obvious decay over20000 cycles even at-30℃.This work offers a successful electrolyte regulation strategy via the IHP adsorption effect to design electrolytes for high-performance rechargeable Zn-ion batteries.

关键词： Inner Helmholtz plane Adsorption effect Dendrite suppression SEI layer Zn||I_(2)battery