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炭/炭复合材料微观结构对热电性能的影响

无机材料学报 2015年第4期30卷 357-362页

作者：胡钢曾燮榕马俊邹继兆彭彪林深圳大学材料学院深圳市特种功能材料重点实验室深圳市陶瓷先进技术工程实验室深圳518060

采用微波化学气相渗透工艺,以炭毡为预制体,甲烷为前驱气体,氮气为载气,制备了具有不同微观组织结构的炭/炭复合材料。通过偏光显微镜、场发射扫描电子显微镜、透射电子显微镜、X射线衍射仪和拉曼光谱仪表征了复合材料的结构,通过热电... 详细信息

采用微波化学气相渗透工艺,以炭毡为预制体,甲烷为前驱气体,氮气为载气,制备了具有不同微观组织结构的炭/炭复合材料。通过偏光显微镜、场发射扫描电子显微镜、透射电子显微镜、X射线衍射仪和拉曼光谱仪表征了复合材料的结构,通过热电性能测试仪和激光热导仪测试了其热电性能。结果表明,炭/炭复合材料具有正的热电效应,且复合材料的热电性能与热解炭的取向性有很大的关系:从各向同性、低织构、中织构到高织构,其Seebeck系数、电导率和热导率逐渐增加,同时织构化的增强对载流子的影响大于对声子的影响,进而使热电优值ZT随着织构化的增强逐渐增大。

关键词： C/C复合材料热电性能织构取向性

Piezoresistive MXene/Silk fibroin nanocomposite hydrogel for accelerating bone regeneration by Re-establishing electrical microenvironment

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Bioactive Materials 2023年第4期22卷 1-17页

作者： zhi-Chao hu Jia-Qi Lu Tai-Wei Zhang Hai-Feng Liang Hao Yuan Di-Han Su Wang Ding Rui-Xian Lian Yu-Xiang Ge Bing Liang Jian Dong Xiao-Gang Zhou Li-Bo Jiang Department of Orthopaedic Surgery Zhongshan HospitalFudan UniversityShanghai200032China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai200072China Department of Orthopedics Surgery Minhang HospitalFudan UniversityShanghai201100China Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistryResearch Center for Biomedical Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China Department of Orthopedic Surgery Zhongshan Hospital(Xiamen)Fudan UniversityXiamen361015China

The electrical microenvironment plays an important role in bone ***,the underlying mechanism by which electrical stimulation(ES)promotes bone regeneration remains unclear,limiting the design of bone microenvironment-specific electroactive ***,by simple co-incubation in aqueous suspensions at physiological temperatures,biocompatible regenerated silk fibroin(RSF)is found to assemble into nanofibrils with aβ-sheet structure on MXene nanosheets,which has been reported to inhibit the restacking and oxidation of *** electroactive hydrogel based on RSF and bioencapsulated MXene is thus prepared to promote efficient bone *** MXene/RSF hydrogel also acts as a piezoresistive pressure transducer,which can potentially be utilized to monitor the electrophysiological *** sequencing is performed to explore the underlying mechanisms,which can activate Ca^(2+)/CALM signaling in favor of the direct osteogenesis *** is found to facilitate indirect osteogenesis by promoting the polarization of M2 macrophages,as well as stimulating the neogenesis and migration of *** improvements in bone regeneration and angiogenesis are observed with MXene/RSF hydrogels under ES in ***,the MXene/RSF hydrogel provides a distinctive and promising strategy for promoting direct osteogenesis,regulating immune microenvironment and neovascularization under ES,leading to re-establish electrical microenvironment for bone regeneration.

关键词： Bone regeneration Electrical microenvironment Regenerated silk fibroin MXene Electrical stimulation

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认知无线电系统帧长参数优化

系统工程与电子技术 2012年第9期34卷 1918-1922页

作者：汤海冰胡志刚中南大学信息科学与工程学院湖南长沙410083

针对认知无线电系统帧结构设计中,如果数据发送时间设置不当可能导致干扰过大以及从用户接入机会丢失过多的问题。基于主用户活动服从指数分布的假设,推导建立了系统干扰模型和从用户接入机会丢失模型,该模型能以较大概率保证干扰时间... 详细信息

针对认知无线电系统帧结构设计中,如果数据发送时间设置不当可能导致干扰过大以及从用户接入机会丢失过多的问题。基于主用户活动服从指数分布的假设,推导建立了系统干扰模型和从用户接入机会丢失模型,该模型能以较大概率保证干扰时间及从用户接入丢失时间小于指定百分比值。在此基础上,提出了一个干扰和接入机会丢失受限的认知无线电系统帧长设计方案。实验结果表明,根据该方案设计的帧结构能够有效保证从用户的接入时间、较高的感知效率及较低的干扰率。

关键词：认知无线电帧长丢失机会干扰

新型民族管弦乐队与中国传统音乐资源——对民族管弦乐队发展现状的审视与思考

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黄钟（武汉音乐学院学报） 2007年第1期 71-77页

作者：胡志平武汉音乐学院

论文曾在北京“2006民族管弦乐队训练与创作高层论坛”上宣讲,通过“从吹、拉、弹、打四类乐器中精选出的乐器组建成新型民族管弦乐队,并在此基础上进一步完善声部内高、中、低乐器建制是中国上下八千年来乐器及其演奏形式的实践发展到... 详细信息

论文曾在北京“2006民族管弦乐队训练与创作高层论坛”上宣讲,通过“从吹、拉、弹、打四类乐器中精选出的乐器组建成新型民族管弦乐队,并在此基础上进一步完善声部内高、中、低乐器建制是中国上下八千年来乐器及其演奏形式的实践发展到二十世纪的必然选择,也是中国大型民族管弦乐队的最佳选择;作曲家、指挥家、演奏家的知识结构、艺术素养由于缺失对中国传统乐器的乐器特性、演奏法、艺术意境创造手法的了解和精通,导致目前的新型民族管弦乐队本应具有的特性、魅力缺失“两个方面的分析论述,对新型民族管弦乐队的发展进行了深入的思考和探讨。

关键词：民族管弦乐队传统音乐资源作曲家指挥家演奏家创作训练

Study on the Coincident-Loop Transient Electromagnetic Method in Seafloor Exploration——Taking Jiaodong Polymetallic Mine as a Model

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Journal of Earth Science 2021年第1期32卷 25-41页

作者： Yixing Ma Junhua hu Yanjun Chang Zujian Liu Development and Research Center of China Geological Survey Beijing 100037China Technical Guidance Center for Mineral Resources of Ministry of Natural Resources Beijing 100083China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China Department of Structures and Materials China Institute of Water Resources and Hydropower ResearchBeijing 100038China Institute of Geophysics and Geometrics China University of GeosciencesWuhan 430074China China Aero Geophysical Survey and Remote Sensing Center for Natural and Resources Beijing 100083China

The transient electromagnetic(TEM)method becomes more urgent than ever for marine ex-ploration due to abundant resource reserves and the increasing undersea engineering construction activities,especially in the offshore exploration of mineral deposits such as Sanshandao gold ***,the re-search and application of TEM method in marine environment are still challenged by many *** contradiction motivates our study on the coincident-loop TEM in seafloor *** TEM response of coincident loops is firstly derived in the integral form,based on the potential functions in Helmholtz equ-ations for a magnetic source locating in the whole-space layered *** frequency-domain vertical magnetic field is described as the Hankel integral with double first-order Bessel functions of first ***-condly,the time-domain induced voltage is obtained by transforming the frequency-domain response through the cosine transform and then taking the derivative of *** simultaneously solve the Hankel transform and the cosine transform,a novel algorithm is introduced by adapting the fixed-point quadra-ture and extrapolation via the Shanks ***,a typical conductivity model for marine po-lymetallic deposit is designed to investigate the characteristic of TEM response under various *** results demonstrate that existence of conductive seawater causes the TEM response to increase significantly and decay *** air-sea reflected electromagnetic waves lead to a significantly large fake negative response(NR)in shallower seawater with depth less than 300 *** in the height of loops will weaken and delay the anomaly response and shorten the observation *** height of configu-ration should be no more than 100 m for shallower targets and 50 m for deeper targets,*** observation time-window should cover 10-1000 *** in the radius of loops only enhances the TEM response proportionally but hardly improve

关键词： marine transient electromagnetic method coincident loops induced polarization air-wave effects

Prediction of fibril formation by early-stage amyloid peptide aggregation

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Journal of Pharmaceutical Analysis 2020年第2期10卷 194-199页

作者： Jiaojiao hu huiyong Sun Haiping Hao Qiuling Zheng Department of Pharmaceutical Analysis School of PharmacyChina Pharmaceutical UniversityTongjiaxiang#24NanjingJiangsu210009China Department of Medicinal Chemistry School of PharmacyChina Pharmaceutical UniversityTongjiaxiang#24NanjingJiangsu210009China Key Laboratoryof Drug Metabolism and Pharmacokinetics China Pharmaceutical UniversityTongjiaxiang#24NanjingJiangsu210009China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityTongjiaxiang#24NanjingJiangsu210009China

Amyloid fibrils are found in systemic amyloidosis diseases such as Alzheimer's disease,Parkinson's disease,and type II ***,these diseases are diagnosed by observation of fibrils or plaques,which is an ineffective method for early diagnosis and treatment of *** goal of this study was to develop a simple and quick method to predict the possibility and speed of fibril formation before its *** generated from seven representative peptide segments were first isolated and detected by ion-mobility mass spectrometry(IM-MS).Then,their assemblies were disrupted using formic acid(FA).Interestingly,oligomers that showed small ion intensity changes upon FA addition had rapid fibril *** contrast,oligomers that had large ion intensity changes generated fibrils *** control peptides(aggregation/no fibrils and no aggregation/no fibrils)did not show changes in their ion intensities,which confirmed the ability of this method to predict amyloid *** summary,the developed method correlated MS intensity ratio changes of peptide oligomers on FA addition with their amyloid *** method will be useful for monitoring peptide/protein aggregation behavior and essential for their mechanism studies.

关键词： Mass spectrometry Amyloid fibril Early-stage oligomer Peptide aggregation

Using FEM to predict tree motion in a wind field

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第7期9卷 907-915页

作者： Xiao-yi hu Wei-ming TAO Yi-mu GUO Department of Mechanical Engineering Zhejiang University Hangzhou 310027 China School of Engineering Zhejiang Forestry University Hangzhou 311300 China

In this paper we propose a finite element(FE) simulation method to predict tree motion in a wind field. Two FE tree models were investigated:One model was generated based on a realistic nature-looking geometric tree model,and the other was a symmetric model to investigate the influence of asymmetric material properties on tree motion. The vortex-induced vibration(VIV) theory is introduced to estimate the fluctuating wind force being exerted on tree stems and the fluid-structure interaction(FSI) analysis is also included in the simulation. The results indicate that asymmetric material properties result in the crosswind displacement of the investigated node and the main swaying direction deviation. The simulation reveals that under wind loading,a tree with leaves has much larger swaying amplitude along the wind direction and longer swaying period than a tree without leaves. However,the crosswind swaying amplitude is mainly due to branch interaction. The numerical simulation proved that the inter-action of tree branches can prevent dangerous swaying motion developing.

关键词： Finite element method (FEM) Fluid-structure interaction (FSI) Vortex-induced vibration (VIV) Asymmetric Wind field

Improvement of Response Performance of Liquid Crystal Optical Devices by using a Low Viscosity Component

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Chinese Physics Letters 2011年第9期28卷 147-149页

作者： PENG Zeng-hui LIU Yong-Gang YAO Li-Shuang CAO Zhao-Liang MU Quan-Quan hu Li-Fa LU Xing-Hai XUAN Li ZHANG zhi-Yong State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033 Wuhan Polytechnic University Wuhan 430024

Difluorooxymethylene-bridged(CF2O)liquid crystal(LC)with low viscosity is prepared and used as a fast response LC *** the material is mixed with isothiocyanato LCs with high birefringence,the visco−elastic coefficient of the mixture decreases evidently and,accordingly,the response performance *** the concentration of CF2O LCs is about 7%,the LC mixture approximately maintains high birefringence and exhibits a fastest response performance that is 14%higher than that of pure isothiocyanato ***,the LC material and mixing method could find useful applications in optical devices.

关键词： material mixture

Delineating the longitudinal tumor evolution using organoid models

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Journal of Genetics and Genomics 2021年第7期48卷 560-570页

作者： Zhaolian Lu Beina Nie Weiwei Zhai Zheng hu CAS Key Laboratory of Quantitative Engineering Biology Shenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China CAS Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650223China

Cancer is an evolutionary process fueled by genetic or epigenetic alterations in the *** the evolutionary dynamics that are operative at different stages of tumor progression might inform effective strategies in early detection,diagnosis,and treatment of ***,our understanding on the dynamics of tumor evolution through time is very limited since it is usually impossible to sample patient tumors *** recent advances in in vitro 3D organoid culture technologies have opened new avenues for the development of more realistic human cancer models that mimic many in vivo biological characteristics in human ***,we review recent progresses and challenges in cancer genomic evolution studies and advantages of using tumor organoids to study cancer *** propose to establish an experimental evolution model based on continuous passages of patient-derived organoids and longitudinal sampling to study clonal dynamics and evolutionary patterns over *** and integration of population genetic theories and computational models into time-course genomic data in tumor organoids will help to pinpoint the key cellular mechanisms underlying cancer evolutionary dynamics,thus providing novel insights on therapeutic strategies for highly dynamic and heterogeneous tumors.

关键词： Tumor evolution Tumor heterogeneity Longitudinal sampling Genomic sequencing Organoids Tumor microenvironment