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Generalized Drude model and electromagnetic screening in metals and superconductors

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Chinese Physics B 2018年第5期27卷 453-457页

作者： da Wang national Laboratory of Solid State Microstructures ＆ School of Physics Nanjing University Nanjing 210093 China

Electromagnetic screening is studied from the perspective of fluid mechanics by generalizing the Drude theory, which unifies three known results： Thomas–Fermi screening of the longitudinal field in both metals and superconductors, the skin effect of the transverse field in metals, and the Meissner effect in superconductors. In the special case of superfluid electrons, we slightly generalize the London equations to incorporate the longitudinal electric fields. Moreover, regarding the experiments, our study points out that the dynamical measurement may overestimate the superfluid density.

关键词： electromagnetic screening Thomas-Fermi screening London penetration depth Meissner effect

The Visual Pathway for Binocular Integration

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Neuroscience Bulletin 2020年第9期36卷 1089-1091页

作者： na Li Yu Gu State Key Laboratory of Medical Neurobiology and Ministry of Education Frontiers Center for Brain Science Institutes of Brain ScienceFudan UniversityShanghai 200032China

It is generally believed that the visual pathways from each eye do not integrate to form binocular vision until they reach the primary visual cortex (V1),and individual neurons in the visual thalamus (dorsal lateral geniculate nucleus,dLGN) are thought to receive retinal inputs from either the contralateral or the ipsilateral eye [1].

关键词： Visual visual Integration

Optimal Design of Distributed Energy Resource Systems under Uncertainties Based on Two-Stage Robust Optimization

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Journal of Thermal Science 2021年第1期30卷 51-63页

作者： LI da ZHANG Shijie Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Research Center for Clean Energy and Power Chinese Academy of SciencesLianyungang 222069China

Distributed energy resource(DER)systems are widely used owing to their excellent economic and environmental ***,uncertainties in the system generate difficulties in the optimal design of DER *** practice,the distribution of uncertain parameters is generally *** this work,a two-stage robust optimization(RO)model was proposed for the optimal design of DER systems considering uncertainties in renewable energy intensity,energy prices,and load *** uncertainty sets(i.e.,the box,ellipsoid,and convex-hull uncertainty sets)were adopted to describe the distribution of uncertain parameters,and the proposed two-stage RO problem was solved using affine decision rules.A typical hospital in Lianyungang,Jiangsu Province,China,was selected as the case study object,and the effectiveness of the model was *** case study results showed that uncertainties in energy prices and load demands have a significant impact on system configuration and economic performance,and mainly affect the installed capacities of gas boilers,absorption chillers,and *** set will affect the optimization results and an appropriate uncertainty set should be adopted to describe uncertainties precisely and increase accuracy of results.

关键词： distributed energy resource optimal design two-stage robust optimization uncertainty uncertainty set

Tissue engineering for the repair of peripheral nerve injury

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Neural Regeneration Research 2019年第1期14卷 51-58页

作者： Pei-Xun Zhang na Han Yu-Hui Kou Qing-Tang Zhu Xiao-Lin Liu da-Ping Quan Jian-Guo Chen Bao-Guo Jiang Peking University People's Hospital The First Affiliated Hospital of Sun Yat-sen University School of Life Science Peking University

Peripheral nerve injury is a common clinical problem and affects the quality of life of patients. Traditional restoration methods are not satisfactory. Researchers increasingly focus on the field of tissue engineering. The three key points in establishing a tissue engineering material are the biological scaffold material, the seed cells and various growth factors. Understanding the type of nerve injury, the construction of scaffold and the process of repair are necessary to solve peripheral nerve injury and promote its regeneration. This review describes the categories of peripheral nerve injury, fundamental research of peripheral nervous tissue engineering and clinical research on peripheral nerve scaffold material, and paves a way for related research and the use of conduits in clinical practice.

关键词： nerve regeneration scaffold biomaterial stem cells nerve growth factor peripheral nerve injury peripheral nerve repair tissue engineering neural regeneration

A head-mounted photoacoustic fiberscope for hemodynamic imaging in mobile mice

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Light(Science & Applications) 2024年第6期13卷 1012-1014页

作者： Xiaoyan Zheng Shuai na national Biomedical Imaging Center College of Future TechnologyPeking UniversityBeijing100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing100871China

A miniaturized photoacoustic fiberscope has been developed, featuring a lateral resolution of 9 microns and a lightweight design at 4.5 grams. Engineered to capture hemodynamic processes at single-blood-vessel resolution at a rate of 0.2 Hz, this device represents an advancement in head-mounted tools for exploring intricate brain activities in mobile animals.

关键词： fiber mobile Engine

Mindfulness-based cognitive therapy in the intervention of psychiatric disorders: A review

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International Journal of Nursing Sciences 2014年第2期1卷 232-239页

作者： Jian-Fei Xie Jian-da Zhou Li-na Gong Joanne DeSanto Iennaco Si-Qing Ding Third Xiangya Hospital Central South UniversityChangshaChina Psychiatric-Mental Health Nursing Yale University School of NursingWest HavenCTUSA

Mindfulness-based cognitive therapy(MBCT)is frequently used for psychiatric *** MBCT’s considerable potential for improving psychological health for patients,there is little empirical evidence to support its practical application in *** review will define meditation and mindfulness,provide an overview of the development of MBCT,identify the evidence for the effectiveness of MBCT,and offer recommendations to medical personnels on how to provide support for patients receiving mindfulness intervention.

关键词： Anxiety Depression Meditation Mindfulness Mindfulness-based cognitive therapy Mindfulness-based interventions Mindfulness-based stress reduction

Microstructural Characteristics of Epitaxial BaSrNb_(0.3)Ti_(0.7)O_3 Film

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Journal of Materials Science & Technology 2007年第4期23卷 517-520页

作者： Li＇na CHENG Xiuliang MA Shenyang national Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Microstructural characteristics in the BaSrNb0.3Ti0.7O3 thin film, grown on SrTiO3 substrate by computercontrolled laser molecular beam epitaxy, were characterized by means of transmission electron microscopy （TEM）. It is found that the film is single-crystallized and epitaxially grown on the SrTiO3 substrate forming a flat and distinct interface. Anti-phase domains were identified, and the crystallographic features of mismatch dislocations at the interface between film and substrate were clarified. The high conductivity of the present film was discussed from the viewpoint of Nb dopant and the nitrogen atmosphere.

关键词： BaSrNb0.3Ti0.7O3 thin film Epitaxial growth Transmission electron microscopy TEM

Characterization of lattice parameters gradient of Cu(In1-xGax)Se2 absorbing layer in thin-film solar cell by glancing incidence X-ray diffraction technique

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Journal of Materials Science & Technology 2020年第16期47卷 193-201页

作者： Yong-il Kim Ki-Bok Kim Miso Kim Department of nano Science University of Science and Technology217GajeongYuseongDaejeon34113Republic of Korea Korea Research Institute of Standards and Science 267GajeongYuseongDaejseon34113Republic of Korea

In or Ga gradients in the Cu(In1-xGax)Se2(CIGS)absorbing layer lead to change the lattice parameters of the absorbing layer,giving rise to the bandgap grading in the absorbing layer which is directly associated with the degree of absorbing ability of the CIGS solar *** tried to characterize the depth profile of the lattice parameters of the CIGS absorbing layer using a glancing incidence X-ray diffraction(GIXRD)technique,and then investigate the bandgap grading of the CIGS absorbing *** the glancing incident angle increased from 0.50 to 5.00°,the a and c lattice parameters of the CIGS absorbing layer gradually decreased from 5.7776(3)to 5.6905(2)?,and 11.3917(3)to 11.2114(2)?,*** depth profile of the lattice parameters as a function of the incident angle was consistent with vertical variation in the compositionof In or Ga with depth in the absorbing *** variation of the lattice parameters was due to the difference between the ionic radius of In and Ga co-occupying at the same crystallographic *** to the results of the depth profile of the refined parameters using GIXRD data,the bandgap of the CIGS absorber layer was graded over a range of 1.222-1.532 *** approach allows to determine the In or Ga gradients in the CIGS absorbing layer,and to nondestructively guess the bandgap depth profile through the refinement of the lattice parameters using GIXRD data on the assumption that the changes of the lattice parameters or unit-cell volume follow a good approximation to Vegard’s law.

关键词： Cu(In1-xGax)Se2 absorbing layer Depth profile Glancing incidence X-ray diffraction technique Bandgap grading Vegard’s law

Homogenization on solution treatment and its effects on the precipitation-hardening of selective laser melted 17-4PH stainless steel

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Journal of Materials Science & Technology 2023年第35期166卷 47-57页

作者： Sohee An Du-Rim Eo il Sohn Kyunsuk Choi Department of Materials Science and Engineering Yonsei UniversitySeoul03722Republic of Korea Advanced Joining&Additive Manufacturing R&D Department Korea Institute of Industrial Technology(KITECH)529 Seohaean-roSiheung 15014Republic of Korea Department of Industry-University Convergence Hanbat National UniversityYuseongDaejeon34158Republic of Korea

17-4 precipitation-hardened(PH)stainless steel(SS)exhibits high strength and good corrosion resistance via Cu-precipitation *** conventional wrought 17-4PH SS,Cu segregation andε-Cu pre-cipitates are observed in additively manufactured(AM)17-4PH SS owing to the repeated rapid cooling after heating,which characterizes the AM *** this study,solution treatment was conducted under various temperatures(1,000,1,050,1,100,and 1,200℃)and durations(1,2,4,and 8 h)to minimize the negative effects of Cu segregation andε-Cu precipitates on precipitation *** mechanical prop-erties and microstructures of each condition for the Cu precipitation behavior were *** theε-Cu precipitates did not disappear after solution treatment,the average diameter of theε-Cu precipi-tates tended to decrease with increasing solution treatment temperature and ***,solution treatment at a temperature of 1,200℃ for 8 h was the best,resulting in improved strength compared to the conventional solution treatment at 1,050℃.Solution treatment on at least 1,100℃ is effective in AM.

关键词： Selective laser melting Cu segregation Solution treatment 17-4 Precipitation-hardened stainless steel Additive manufacturing