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Formation Energies and Electronic Structures of Native Defects in GaN

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Chinese Physics Letters 1996年第11期13卷 867-869页

作者： xie Jian-jun ZHANG Kai-ming xie xi-de Department of Physics Fudan UniversityShanghai 200433

The electronic structures and the formation energies of native point defects in cubic GaN have been studied via the linear muffin-tin orbital *** results show that the nitrogen vacancy is the dominant defect in the intrinsic cubic *** the antisites and interstitial defects,it is found that a tetrahedral interstitial nitrogen atom surrounded by four Ga atoms NTGa is most easily formed,and the formation energy of NGaNGa antisite is much less than that of GaN *** changes of the density of states due to the introduction of defects are discussed.

关键词： GaN method cubic

A Note on Calculation of Threshold Resonance by the Method of Complex Scaling

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Chinese Physics Letters 1996年第4期13卷 241-244页

作者： ZHAO Mei-shan xie xi-shun The Janies Franck Institute The University of ChicagoChicagoIllinois 60637USA Department of Physics University of MinnesotaMinneapolisMinnesota 55455USA Department of Physics Southeastern UniversityNanjing210096

A new approach to threshold resonance calculation by the complex scaling method is *** to scattering over a model potential barrier is presented and compared to a direct quantum scattering calculation.

关键词： calculation. scaling quantum

Linear Accelerator Beam Transport Operator

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Chinese journal of nuclear physics 1994年第2期16卷 177-182页

作者： xie, xi Wang, Sheng Graduate School of Nuclear Industry Beijing China

The accelerator beam transport operator presents the evolution of beam phasespace point with given transport elements and given initial point,while the inverse beamtransport operator presents the evolution of beam phase space configuration with giveninitial phase space ***,it is necessary to develop a general theory be-tween these two *** concrete examples are worked out in detail to showthe practical applications of such a *** paper deals with the linear acceleratorbeam transport operator,and a theorem of finding the inverse linear beam transportoperator for both autonomous and nonautonomous accelerator dynamics is developed.

关键词： Accelerator dynamic system Beam transport operator Inverse beam transport operator

Expert System for the Transport Operator of Accelerator Single-Freedom Nonlinear Components

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Chinese journal of nuclear physics 1995年第4期17卷 353-359页

作者： Wang, Sheng xie, xi Graduate School of Nuclear Industry Beijing China

An expert system by Arity Prolog is developed for the transport operator of accelera-tor single-freedom nonlinear components. It automatically yields any order transport operatorand its inverse transport operator for various accelerator single-freedom nonlinear *** an example, the fifth order inverse transport operator derived by the expert system is given.

关键词： Expert system Accelerator single-freedom nonlinear component Transport operator

Nonlinear Accelerator Beam Transport Operator

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Chinese journal of nuclear physics 1994年第2期16卷 183-188页

作者： xie, xi Wang, Sheng Graduate School of Nuclear Industry Beijing China

This paper deals with the theory of nonlinear accelerator beam transport *** nonautonomous accelerator dynamics,a theorem of finding the inversenonlinear beam transport operator is *** concrete examples are workedout ... 详细信息

关键词： Nonlinear dynamic system Beam ausport operator Inverse beam transport operator

To increase more than 10% in efficiency of perovskite solar cells by using nanoholes SnO_(2)

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Rare Metals 2021年第10期40卷 2778-2784页

作者： Shu-Ren Sun xi-xi xie Guo-Gang Qin Li-xin xiao State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The perovskite solar cells have been intensively investigated these years due to their premium electrical and optical properties as well as huge potential for *** order to further increase the power conversion efficiency(PCE) of the thin film perovskite solar cells, light management should be taken into consideration. Herein, we apply a lithography method to transfer randomly distributed polystyrene(PS) nanospheres into the electron transporting SnO_(2) layer, by means of which, a nanoholes structure is formed. Finally, we get a nanostructured perovskite layer under low temperature(less than 150 ℃).The depth of SnO_(2) nanoholes is around 60 nm when the device is fabricated with 300-nm PS, and 150 nm in depth when 500-nm PS is used. The device gains PCE of 17.97%,which is 12.3% higher than that with planar electrontransporting SnO_(2) layer and 300-nm CH_(3)NH_(3)PbI_(3) *** findings provide an applicable method to improve the light absorption, which can not only make the absorbing layer of lead-based perovskite solar cells thinner to help decrease the content of lead, but also increase the PCE of non-lead perovskite devices.

关键词： Light trap Perovskite Solar cell Nanohole Nanosphere lithography

Transport Operator of Accelerator Single-Freedom Nonlinear Components

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Chinese journal of nuclear physics 1995年第3期17卷 277-282页

作者： Wang, Sheng xie, xi Graduate School of Nuclear Industry Beijing China

For accelerator single-freedom nonlinear components,the general theory of nonlinear transportis developed,and the algorithm for the inverse transport operator is given,based on which an expert sys-tem can be built to automatically yield any order transport operator and its inverse transport operator forvarious accelerator single-freedom nonlinear components.

关键词： Accelerator single-freedom nonlinear component Transport operator Inverse transport operator

In-Cell Nanoelectronics:Opening the Door to Intracellular Electrophysiology

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Nano-Micro Letters 2021年第8期13卷 191-217页

作者： Dongxin Xu Jingshan Mo xi xie Ning Hu State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006People’s Republic of China The First Affiliated Hospital of Sun Yat-Sen University Guangzhou 510080People’s Republic of China State Key Laboratory of Transducer Technology Chinese Academy of SciencesShanghai 200050People’s Republic of China

Establishing a reliable electrophysiological recording platform is crucial for cardiology and neuroscience *** and label-free planar multitransistors and multielectrode arrays are conducive to perform the large-scale cellular electrical activity recordings,but the signal attenua-tion limits these extracellular devices to record subthreshold *** recent decade,in-cell nanoelectronics have been rapidly developed to open the door to intracellular *** the unique three-dimensional nanotopography and advanced penetration strategies,high-throughput and high-fidelity action potential like signal recordings is expected to be *** review summarizes in-cell nanoelectronics from versatile nano-biointerfaces,penetration strategies,active/pas-sive nanodevices,systematically analyses the applications in electrogenic cells and especially evaluates the influence of nanodevices on the high-quality intracellular electrophysiological ***,the opportunities,challenges and broad prospects of in-cell nanoelectronics are prospected,expecting to promote the development of in-cell electrophysiological platforms to meet the demand of theoretical investigation and clinical application.

关键词： In-cell nanoelectronics Nano-biointerfaces Intracellular electrophysiology Electrogenic cells

Three-dimensional constitutive model for magneto-mechanical deformation of NiMnGa ferromagnetic shape memory alloy single crystals

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Acta Mechanica Sinica 2019年第3期35卷 563-588页

作者： Chao Yu Guozheng Kang Di Song xi xie State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Mechatronics Engineering University of Electronic Science and Technology of ChinaChengdu 610031China

Existing experimental results have shown that four types of physical mechanisms, namely, martensite transformation, martensite reorientation, magnetic domain wall motion and magnetization vector rotation, can be activated during the magneto-mechanical deformation of NiMnGa ferromagnetic shape memory alloy (FSMA) single crystals. In this work, based on irreversible thermodynamics, a three-dimensional (3D) single crystal constitutive model is constructed by considering the aforementioned four mechanisms simultaneously. Three types of internal variables, i.e., the volume fraction of each martensite variant, the volume fraction of magnetic domain in each variant and the deviation angle between the magnetization vector, and easy axis are introduced to characterize the magneto-mechanical state of the single crystals. The thermodynamic driving force of each mechanism and the thermodynamic constraints on the constitutive model are obtained from Clausius's dissipative inequality and constructed Gibbs free energy. Then, thermodynamically consistent kinetic equations for the four mechanisms are proposed, respectively. Finally, the ability of the proposed model to describe the magneto-mechanical deformation of NiMnGa FSMA single crystals is verified by comparing the predictions with corresponding experimental results. It is shown that the proposed model can quantitatively capture the main experimental phenomena. Further, the proposed model is used to predict the deformations of the single crystals under the non-proportional mechanical loading conditions.

关键词： Ferromagnetic shape memory alloys Single crystals Magneto-mechanical deformation Martensite transformation Martensite reorientation Constitutive model