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Molecular dynamics study on microscale residual stress of graphene/aluminum nanocomposites by selective laser sintering

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Rare Metals 2022年第11期41卷 3677-3683页

作者： Xing-Nan hao xia Liu Department of Engineering Mechanics Beijing University of TechnologyBeijing100124China

The fabrication of graphene/metal matrix composites by selective laser sintering(SLS)technique has been extensively studied;however,the complex micros truc ture and residual stress limit their further ***,the sinterin... 详细信息

关键词： stress residual composites

Nonlocal Nonlinear Schr?dinger System with Shifted Parity and Delayed Time Reversal Symmetries

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Communications in Theoretical Physics 2018年第7期69卷 7-13页

作者： cong-cong Li Qian xia Sen-Yue Lou Center for Nonlinear Science and Department of Physics Ningbo UniversityNingbo 315211China Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062China

A special integrable nonlocal nonlinear Schroodinger equation, NNLS, or namely Alice-Bob NLS（ABNLS）equation is investigated. By means of the general N-th Darboux transformation, one can get various interesting solutions to display different types of structures especially for solitons. By using the Darboux transformation, its soliton solutions are obtained. Finally, by adjusting the values of free parameters, different kinds of solutions such as kinks, complexitons and rogue-wave solutions are explicitly exhibited. It is found that these solutions are quite different from the ones of the classical NLS equation.

关键词： nonlocal nonlinear systems Darboux transformation Alice-Bob physics exact solutions

Efficient Environment-friendly Lead-free Tin Perovskite Solar Cells Enabled by Incorporating 4-Fluorobenzylammonium Iodide Additives

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Energy & Environmental Materials 2023年第6期6卷 318-326页

作者： Shengli Zou Shengqiang Ren Yiting Jiang Yuanfang Huang Wenwu Wang Changlei Wang cong Chen xia hao Lili Wu Jingquan Zhang Dewei Zhao College of Materials Science and Engineering&Institute of New Energy and Low-Carbon Technology Sichuan UniversityEngineering Research Center of Alternative Energy Materials&DevicesMinistry of EducationChengdu 610065China School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSoochow UniversitySuzhou 215006China

Development of tin(Sn)-based perovskite solar cells(PSCs)largely lags behind that of lead counterparts due to fast crystallization process of Sn perovskite and numerous defects in both bulk and surface of Sn perovskite ***,this work reports a facile strategy of introducing 4-fluorobenzylammonium iodide(FBZAI)as additives into Sn perovskite precursor to synergistically modulate the roles of benzylamine and fluorine in Sn-based *** of FBZAI can increase crystallinity,passivate defects,and inhibit the oxidation of Sn^(2+),leading to suppression of nonradiative recombination and enhancement of charge transport and collection in *** a result,the best-performing Sn-based PSC with the FBZAI additive achieves the maximum PCE of 13.85%with the enhanced fill factor of 77.8%and open-circuit voltage of 0.778 *** unencapsulated device exhibits good stability by maintaining 95%of its initial PCE after 160 days of storage.

关键词： 4-fluorobenzylammonium iodide defect passivation lead-free Sn perovskites perovskite solar cells stability

Management and Reconfiguration of a Radiology Department under the Threat of Coronavirus Disease 2019:Experience from Wuhan

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Current Medical Science 2020年第4期40卷 608-613页

作者： Meng TIAN cong-cong LIU Lu LONG Qiu-xia WANG Department of Radiology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430000China Department of Epidemiology and Biostatistics West China School of Public HealthSichuan UniversityChengdu 610000China

Summary:The corona virus disease 2019(COVID-19)is an emerging respiratory infectious disease caused by SARS-CoV-2,which first occurred in December 2019 in Wuhan,*** days,in China,chest CT is used for diagnosis of COVID-19,as an important complement to the reverse-transcription polymerase chain reaction(RT-PCR)*** of contacting with a large number of suspected or probable cases closely during chest CT examination,radiographers are easily infected with *** article included the rearrangement of CT examination room in fever clinic,the rearrangement of human resources in radiology department,and the drafting of new operating procedures for radiologists who carry out CT examination on COVID-19 *** article also introduced the emergency management procedures of the department of radiology during the outbreak,and the experience of infection prevention for the staff of the department of radiology.

关键词： COVID-19 management reconfiguration radiology department

Exact mobility edges and topological phase transition in two-dimensional non-Hermitian quasicrystals

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 82-90页

作者： Zhi-hao Xu Xu xia Shu Chen Institute of Theoretical Physics and State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi UniversityTaiyuan 030006China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Chern Institute of Mathematics and LPMC Nankai UniversityTianjin 300071China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Yangtze River Delta Physics Research Center Liyang 213300China

The emergence of the mobility edge(ME)has been recognized as an important characteristic of Anderson *** difficulty in understanding the physics of the MEs in three-dimensional(3 D)systems from a microscopic image encourages the development of models in lower-dimensional systems that have exact *** most of the previous studies are concerned with one-dimensional(1 D)quasiperiodic systems,the analytic results that allow for an accurate understanding of two-dimensional(2 D)cases are *** this work,we disclose an exactly solvable 2 D quasicrystal model with parity-time(PT)symmetry displaying exact *** the thermodynamic limit,we unveil that the extended-localized transition point,observed at the PT symmetry breaking point,is topologically characterized by a hidden winding number defined in the dual *** coupling waveguide platform can be used to realize the 2 D non-Hermitian quasicrystal model,and the excitation dynamics can be used to detect the localization features.

关键词： quasicrystals mobility edges non-Hermitian systems localization properties

A Neighborhood Union Condition for Fractional ID-[a, b]-factor-critical Graphs

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Acta Mathematicae Applicatae Sinica 2018年第4期34卷 775-781页

作者： Yuan YUAN Rong-xia hao Department of Mathematics Beijing Jiaotong University

Let a, b, r be nonnegative integers with 1 ≤ a ≤ b and r ≥ 2. Let G be a graph of order n with n 〉（a＋2 b）（r（a＋b）-2）/*** this paper, we prove that G is fractional ID-[a, b]-factor-critical if δ（G）≥bn/a＋2 b＋a（r-1）and ｜NG（x1） ∪ NG（x2） ∪…∪ NG（xr）｜ ≥（a＋b）n/（a＋2 b） for any independent subset {x1,x2,…,xr} in G. It is a generalization of Zhou et al.＇s previous result [Discussiones Mathematicae Graph Theory, 36： 409-418（2016）]in which r = 2 is discussed. Furthermore, we show that this result is best possible in some sense.

关键词： graph minimum degree neighborhood fractional [a b]-factor fractional ID-[a b]-factor-critical

Vertically aligned montmorillonite aerogel-encapsulated polyethylene glycol with directional heat transfer paths for efficient solar thermal energy harvesting and storage

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 907-916页

作者： Qijing Guo cong Guo hao Yi Feifei Jia Shaoxian Song Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources Ministry of EducationWuhan University of TechnologyWuhan 430070China School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan University of TechnologyWuhan 430070China

The conversion and storage of photothermal energy using phase change materials(PCMs)represent an optimal approach for harnessing clean and sustainable solar ***,we encapsulated polyethylene glycol(PEG)in montmorillonite aerogels(3D-Mt)through vacuum impregnation to prepare 3D-Mt/PEG composite *** used as a support matrix,3D-Mt can effectively prevent PEG leakage and act as a flame-retardant barrier to reduce the flammability of ***,3D-Mt/PEG demonstrates outstanding shape retention,increased thermal energy storage density,and commendable thermal and chemical *** phase transition enthalpy of 3D-Mt/PEG can reach 167.53 J/g and remains stable even after 50 heating-cooling ***,the vertical sheet-like structure of 3D-Mt establishes directional heat transport channels,facilitating efficient phonon *** configuration results in highly anisotropic thermal conductivities that ensure swift thermal responses and efficient heat *** study addresses the shortcomings of PCMs,including the issues of leakage and inadequate flame *** achieves the development and design of 3D-Mt/PEG with ultrahigh strength,superior flame retardancy,and directional heat ***,this work offers a design strategy for the preparation of high-performance composite *** 3D-Mt/PEG with vertically aligned and well-ordered array structure developed in this research shows great potential for thermal management and photothermal conversion applications.

关键词： montmorillonite aerogel polyethylene glycol phase change materials solar thermal energy storage flame retardant

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神经生长因子对骨骼形成及骨疾病的影响

中国组织工程研究 2025年第20期29卷 4266-4275页

作者：魏鹤翔孙彬刘昊刘含强夏鹏吉林大学第二医院脊柱外科吉林省长春市130000

背景:神经生长因子在骨骼的生理和病理进程中发挥了重要作用,系统性分析神经生长因子对骨组织的影响在组织工程及临床治疗两方面都具有重要意义。目的:探究神经生长因子通过骨组织细胞和骨神经-血管耦合等途径调控骨形成的过程,同时研... 详细信息

背景:神经生长因子在骨骼的生理和病理进程中发挥了重要作用,系统性分析神经生长因子对骨组织的影响在组织工程及临床治疗两方面都具有重要意义。目的:探究神经生长因子通过骨组织细胞和骨神经-血管耦合等途径调控骨形成的过程,同时研究神经生长因子在骨相关疾病病理进程中的作用。方法:在中国知网、万方、PubMed数据库以“神经生长因子,TrkA,骨,软骨”为中文检索词,以“Nerve growth factor,TrkA,NGF,bone,cartilage”为英文检索词进行文献检索,共检索到2 925篇文献。经过筛选后纳入116篇文献进行归纳总结,撰写综述。结果与结论:神经生长因子既可在骨、软骨、神经、血管等组织细胞中表达,又可作用于这些细胞发挥调控作用。通过多种分泌调控方式,神经生长因子在骨组织内部和骨、神经、血管组织间发挥信号传导作用。通过促进骨髓间充质干细胞的增殖、分化,神经生长因子可促进骨形成及骨修复。神经生长因子介导的破骨细胞生成说明其对骨组织具有多向调控作用。同时,神经生长因子与多种骨科疾病的发生发展高度相关,可能提供新的临床治疗思路。对神经生长因子的研究是了解骨骼生理及病理变化的重要方向之一。

关键词：神经生长因子骨软骨关节炎骨形成骨修复神经-血管耦合骨组织工程

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Performance Analysis of a Combined Absorption Refrigeration-Liquid Desiccant Dehumidification THIC System Driven by Low-Grade Heat Source

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Journal of Thermal Science 2020年第5期29卷 1193-1205页

作者： XU cong SUI Jun DAI Yuze LIU Feng LIU hao Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Traditional condensing air-conditioning systems consume large amounts of energy in hot and humid areas,and it is difficult to achieve simultaneous control of temperature and humidity.A combined absorption refrigeration(AR)and liquid desiccant dehumidification(LDD)air-conditioning system based on cascade utilization of low-grade heat source is *** system can realize independent control of temperature and humidity and carry out profound recovery of low-grade heat *** the design conditions,the heat utilization rate C reaches 21.05%,which is 2.73 times that of the conventional absorption refrigeration reference system.A parametric sensitivity analysis is performed to optimize the *** C increases from 9.79%to 18.55%and the coefficient of performance C O P t increases from 0.33 to 0.35 with an increase in chilled water temperature from 7°C to 15°*** an increase in regenerant solution temperature from 60°C to 70°C,the C achieves the optimal value of 21.05%at 68°C.C decreases from 21.05%to 15.05%as the concentration of the regenerant solution increases from 36%to 40%.Under variable environmental temperature and humidity,the C the proposed system changes within a small range and stays much higher than that of the reference system with the same quality heat source,which indicates that the proposed system has a better adaptability to changing environmental parameters.

关键词： temperature and humidity independent control(THIC) low-grade heat source cascade utilization heat utilization rate