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Double drumheadlike surface states in elemental group Ⅴ nodal line semimetals

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Nano Research 2020年第4期13卷 927-931页

作者： Yang hang Wanlin guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Educationand Institute of NanoscienceNanjing University of Aeronautics and AstronauticsNanjing 210016China

Drumheadlike surface states are typical characteristics in nodal line semimetals and bring varieties of unusual attractive *** we demonstrate the double drumheadlike surface states in group V elemental semimetals As,Sb,Bi,which family materials behave a nodal line topology with a 3D flowerlike nodal line,using first-principles ***(001)surface of group V elemental semimetals,the projection pattern of the nodal line overlaps and a complicated double drumheadlike surface state appears inside the overlapped *** double surface state is widely distributed on the surface region up to a penetration depth of 3.5 nm,which is much deeper than the depth of single surface state on(111)*** that the simplicity of the elemental structure and the small gap induced by the spin orbit coupling,this family materials are promising candidates for the experimental observation of the novel double drumheadlike surface state.

关键词： double drumheadlike surface states nodal line semimetals elemental materials electronic structure

Review on cyclic plasticity of magnesium alloys:Experiments and constitutive models

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 567-589页

作者： guo-zheng Kang hang Li Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Applied Mechanics State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

Fatigue analysis has always been a concern in the design and assessment of Mg alloy structure components subjected to cyclic loading,and research on the cyclic plasticity is fundamental to investigate the corresponding fatigue ***,this work reviews the progress in the cyclic plasticity of Mg ***,the existing macroscopic and microscopic experimental results of Mg alloys are ***,corresponding macroscopic phenomenological constitutive models and crystal plasticity-based models are ***,some conclusions and recommended topics on the cyclic plasticity of Mg alloys are provided to boost the further development and application of Mg alloys.

关键词： magnesium alloy cyclic plasticity macroscopic experiments microscopic observations constitutive model

Alteration of functional connectivity in patients with Alzheimer’s disease revealed by resting-state functional magnetic resonance imaging

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Neural Regeneration Research 2020年第2期15卷 285-292页

作者： Jie Zhao Yu-hang Du Xue-tong Ding Xue-Hu Wang guo-Zun Men School of Electronic and Information Engineering Hebei UniversityBaodingHebei ProvinceChina Research Center of Machine Vision Engineering & Technology of Hebei Province BaodingHebei ProvinceChina Key Laboratory of Digital Medical Engineering of Hebei Province BaodingHebei ProvinceChina School of Economics Hebei UniversityBaodingHebei ProvinceChina

The main symptom of patients with Alzheimer’s disease is cognitive dysfunction. Alzheimer’s disease is mainly diagnosed based on changes in brain structure. Functional connectivity reflects the synchrony of functional activities between non-adjacent brain regions, and changes in functional connectivity appear earlier than those in brain structure. In this study, we detected resting-state functional connectivity changes in patients with Alzheimer’s disease to provide reference evidence for disease prediction. Functional magnetic resonance imaging data from patients with Alzheimer’s disease were used to show whether particular white and gray matter areas had certain functional connectivity patterns and if these patterns changed with disease severity. In nine white and corresponding gray matter regions, correlations of normal cognition, early mild cognitive impairment, and late mild cognitive impairment with blood oxygen level-dependent signal time series were detected. Average correlation coefficient analysis indicated functional connectivity patterns between white and gray matter in the resting state of patients with Alzheimer’s disease. Functional connectivity pattern variation correlated with disease severity, with some regions having relatively strong or weak correlations. We found that the correlation coefficients of five regions were 0.3–0.5 in patients with normal cognition and 0–0.2 in those developing Alzheimer’s disease. Moreover, in the other four regions, the range increased to 0.45–0.7 with increasing cognitive impairment. In some white and gray matter areas, there were specific connectivity patterns. Changes in regional white and gray matter connectivity patterns may be used to predict Alzheimer’s disease;however, detailed information on specific connectivity patterns is needed. All study data were obtained from the Alzheimer’s Disease Neuroimaging Initiative Library of the Image and Data Archive Database.

关键词： Alzheimer's disease blood oxygen level-dependent signal correlation coefficient functional connectivity pattern functional magnetic resonance imaging gray matter resting state white matter

追寻东坡足迹,倾听苏子心声--《念奴娇·赤壁怀古》《赤壁赋》联读教学探索

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黄冈师范学院学报 2025年第1期45卷 52-57页

作者：童志国安徽省铜陵市第十八中学安徽铜陵244121

《念奴娇·赤壁怀古》与《赤壁赋》作为苏轼在豪放词和赋体散文领域的代表作,其在高中语文教学中的价值不容忽视。本研究采用比较式群文联读模式,对这两篇体裁各异但题材与创作背景相似的经典文学作品进行比较阅读教学。经过“感知性阅... 详细信息

《念奴娇·赤壁怀古》与《赤壁赋》作为苏轼在豪放词和赋体散文领域的代表作,其在高中语文教学中的价值不容忽视。本研究采用比较式群文联读模式,对这两篇体裁各异但题材与创作背景相似的经典文学作品进行比较阅读教学。经过“感知性阅读—读出情感”“理解性阅读—读出作者”“思辨性阅读—读出发现”三个阶段的系列教学活动,旨在深度剖析苏轼作品中蕴含的深层心理意涵,解读苏子字里行间隐藏的心灵密码,从而实现对经典文本的持续创新解读与教学,达到使经典作品常读常新、教学方法常教常新的目标。

关键词：《念奴娇·赤壁怀古》《赤壁赋》感知性阅读理解性阅读思辨性阅读高阶思维

Fabrication and evaluation of high-performance 3D interpenetrated network structures SiC/Al composites with high-purity plate-like a-SiC framework

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Journal of Materiomics 2024年第2期10卷 499-510页

作者： Jiawei Xie Jinhui Zou Liangcheng tong Syieluing Wong Xin guo hang Qin Pengzhao Gao Wenming guo Hanning Xiao College of Materials Science and Engineering Hunan UniversityChangsha410082China Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhoven5612 AZNetherlands College of Automation and Information Engineering Xi'an University of TechnologyXi'an710048China

To reinforce compatibility with the thermophysical and mechanical properties of SiC/Al composites for electronic packaging to improve the stability and reduce fatigue failure of electronic integrated devices,a novel 3D SiC reinforced framework with interpenetrated plate-like a-SiC grains was synthesized.A small amount of doped a-SiC was seeded to induce the transformation of b-SiC to plate-like a-SiC at 2,300℃,forming a high-purity a-SiC strongly bonded ***/gas pressure infiltration of Al alloy was subsequently used to manufacture the 3D interpenetrated network structure SiC/Al(SiC3D/Al)*** results showed that 15%(in mass)seeds provided the composite with the optimal comprehensive performance,including a low coefficient of thermal expansion(CTE)of 5.54×10^(-6)K^(-1),a high thermal conductivity(l)of 239.08 W·m^(-1)·K^(-1),the highest flexural strength of 326.84 MPa,and a low thermal deformation parameter(TDP)of ***-purity plate-like grains enhanced the purity of the framework promoting a significant improvement in *** the seed content increased to 20%(in mass),both CTE and l reached optimal values of 5.22×10^(-6)K^(-1)and 243.14 W·m^(-1)·K^(-1),but the mechanical properties declined by 10.30%.The synergistic effect of the well-bonded interface and the high-purity 3D SiC framework balanced excellent mechanical properties and multiple thermal functions.

关键词： α-SiC seed Phase transformation Thermophysical properties SiC_(3D)/Al composites Electronic packaging

Numerical Study and Performance Analyses of Mems-Based Particle Velocity Sensor with Combined Inclined Rib Pair

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Journal of Thermal Science 2022年第5期31卷 1503-1517页

作者： ZHU Linhui ZENG Yibo guo hang Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityFujian361005China

The combined inclined rib pair(CIRP)is the first time proposed to improve the sensor performance of particle velocity sensor(PVS)by using a three-dimensional numerical *** method is verified by the experiment results in the *** optimal plain channel parameters are determined as the basic sensor *** comparison of plain channel,both heat transfer characteristics and sensor performance are enhanced effectively by arranging the *** reason is that the high flow rate region caused by the CIRP can maintain strongly in the whole fluid field if there are enough rib ***,the produced longitudinal vortex pair can get a better fluid mix,which is more conductive to heat *** increasing height and number of the CIRP can improve the heat transfer characteristics,but the flow resistance will increase as *** the purpose of finding the best overall performance,the effects of the parameters including the geometric sizes and the position of the CIRP have been *** results show that PVS will get the best sensitivity when the rib length and width are 0.2 mm and 0.03 mm respectively,and the distance between rib pair and between ribs in the same pair are 0.15 mm and 0.3 mm ***,the most suitable crossing angle is 45°.Thus,the performance of PVS can be significantly improved by this novel structure.

关键词： microchannel particle velocity sensor combined inclined rib pair numerical heat transfer sensor performance

Embedding laser generated GaAs nanocrystals in perovskite wires for enhanced charge transport and photodetection

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 83-89页

作者： hang guo Yu tong Haibo Fan Qian Ye Jin Zhang Hongyue Wang Fengren Cao Liang Li Hongqiang Wang Instrumental Analysis Center Xi’an Jiaotong UniversityXi'an 710049China State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China School of Physics Northwest UniversityXi'an 710127China School of Physical Science and Technology Soochow UniversitySuzhou 215006China

Solution-processed perovskite wires are attractive candidates for photodetectors(PDs)due to their simple processibility as well as one-dimensional(1D)geometry with desirable charge carrier ***,the performance of the perovskite PDs is generally restricted by the charge carrier transport and extraction ***,we demonstrate that the charge transport and the consequent photodetection performance of MAPbI_(3)perovskite wires can be effectively enhanced by incorporating nanocrystals(NCs)of GaAs-a semiconductor with high charge carrier *** advantage of the pulsed laser irradiation technique,we successfully fabricate ligand-free GaAs NCs with a size of~7 nm and homogeneously embed them in MAPbI_(3) perovskite wires through a simple solution-processed synthesis *** with the pristine perovskite wires,the GaAs NCs modulated perovskite wires show improved charge carrier transport with the mobility rising from 1.13 to 3.67 cm^(2)V^(-1)s^(-1),and the resultant PD shows significant improvement in responsivity and *** study provides a new strategy for improving optoelectronic properties of halide perovskite materials and optimizing the device performance.

关键词： GaAs nanocrystals pulsed laser irradiation perovskite wires charge carrier transport photodetector

Study on the prediction and inverse prediction of detonation properties based on deep learning

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Defence Technology（防务技术） 2023年第6期24卷 18-30页

作者： Zi-hang Yang Ji-li Rong Zi-tong Zhao Department of Mechanics School of Aerospace EngineeringBeijing Institute of TechnologyBeijing100081China

The accurate and efficient prediction of explosive detonation properties has important engineering significance for weapon *** methods for predicting detonation performance include empirical formulas,equations of state,and quantum chemical calculation *** recent years,with the development of computer performance and deep learning methods,researchers have begun to apply deep learning methods to the prediction of explosive detonation *** deep learning method has the advantage of simple and rapid prediction of explosive detonation ***,some problems remain in the study of detonation properties based on deep *** example,there are few studies on the prediction of mixed explosives,on the prediction of the parameters of the equation of state of explosives,and on the application of explosive properties to predict the formulation of *** on an artificial neural network model and a one-dimensional convolutional neural network model,three improved deep learning models were established in this work with the aim of solving these *** training data for these models,called the detonation parameters prediction model,JWL equation of state(EOS)prediction model,and inverse prediction model,was obtained through the KHT thermochemical *** training,the model was tested for overfitting using the validation-set *** the model-accuracy test,the prediction accuracy of the model for real explosive formulations was tested by comparing the predicted value with the reference *** results show that the model errors were within 10%and 3%for the prediction of detonation pressure and detonation velocity,*** accuracy refers to the prediction of tested explosive formulations which consist of TNT,RDX and *** the prediction of the equation of state for explosives,the correlation coefficient between the prediction and the reference curves was above *** the prediction of the inverse predi

关键词： Deep learning Detonation properties KHT thermochemical Code JWL equation of states Artificial neural network One-dimensional convolutional neural network

Effect of 2s Orbitals on the Electronic Hopping in Polyacetylene

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Chinese Physics Letters 1997年第1期14卷 59-62页

作者： tong guo-ping Department of Physics Zhejiang Normal UniversityJinhua 321004

The extended Wannier function constructed by hydrogen-like atom wave function is used to calculate the electronic hopping and the density of the states of trans-polyacetylene with a single-chain planar *** this technique 2s and 2pz orbitals are taken into *** computed result shows that the electronic hopping interactions,especially non-neighbor hopping,are considerably affected by 2s orbitals,which are able not only to narrow the energy bandwidth and the gap but also to weaken the nearest neighbor hopping slightly and to enhance the non-neighbor hopping greatly.

关键词： structure. neighbor narrow