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Deterministic Approach to Achieve Full-Polarization Cloak

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Research 2021年第1期2021卷 357-369页

作者： He-Xiu Xu Yanzhao Wang Chaohui Wang Mingzhao Wang Shaojie Wang fei ding Yongjun Huang Xiaokuan Zhang Haiwen Liu Xiaohui Ling Wei Huang Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China SDU Nano Optics University of Southern DenmarkCampusvej 55DK-5230 OdenseDenmark School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China

Achieving full-polarization(σ)invisibility on an arbitrary three-dimensional(3D)platform is a long-held knotty issue yet extremely promising in real-world stealth ***,state-of-the-art invisibility cloaks typically work under a specific polarization because the anisotropy and orientation-selective resonant nature of artificial materials made theσ-immune operation elusive and terribly ***,we report a deterministic approach to engineer a metasurface skin cloak working under an arbitrary polarization state by theoretically synergizing two cloaking phase patterns required,respectively,at spin-up(σ+)and spin-down(σ−)***,the wavefront of any light impinging on the cloak can be well preserved since it is a superposition ofσ+andσ−*** demonstrate the effectiveness and applicability,several proof-of-concept metasurface cloaks are designed to wrap over a 3D triangle platform at microwave *** show that our cloaks are essentially capable of restoring the amplitude and phase of reflected beams as if light was incident on a flat mirror or an arbitrarily predesigned shape under full polarization states with a desirable bandwidth of~17.9%,conceiving or deceiving an arbitrary object placed *** approach,deterministic and robust in terms of accurate theoretical design,reconciles the milestone dilemma in stealth discipline and opens up an avenue for the extreme capability of ultrathin 3D cloaking of an arbitrary shape,paving up the road for real-world applications.

关键词： polarization visibility typically

Recent advances in biodegradation controls over Mg alloys for bone fracture management: A review

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Journal of Materials Science & Technology 2019年第4期35卷 535-544页

作者： Ming-Shi Song Rong-Chang Zeng Yun-fei ding Rachel W.Li Mark Easton Ivan Cole Nick Birbilis Xiao-Bo Chen School of Engineering RMIT University Department of Materials Science and Engineering Monash University College of Materials Science and Engineering Shandong University of Science and Technology School of Mechanical Engineering Huaihai Institute of Technology The Medical School The Australian National University

Magnesium(Mg) alloys possess comparable physical and mechanical properties to bone, making them an outstanding candidate of implant materials for bone fracture treatment. In addition to the excellent biocompatibility, and bioactivity, the engagement of Mg alloys is key for a number of biological functionalities in the human body. The unique biodegradation nature of Mg alloy implants implies that it may not require a secondary removal procedure when the expected supporting tasks accomplish, as they may simply and safely "disappear" over time. Nonetheless, the demonstrated drawback of potentially rapid degradation, is an issue that must be addressed appropriately for Mg implants and is consequently given unique attention in this review article. Herein, the critical criteria and the state-of-the-art strategies for controlling the degradation process of Mg alloys are reported. Furthermore, future developments of biodegradable Mg and its alloys systems with satisfactory specifications for clinical trials and deployment,are discussed. This review aims to provide information to materials scientists and clinical practitioners in the context of developing practical biodegradable Mg alloys.

关键词： Magnesium alloys Biodegradation Corrosion mechanisms Cytocompatibility

Study of Feature Extraction Based on Autoregressive Modeling in ECG Automatic Diagnosis

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自动化学报 2007年第5期33卷 462-466页

作者： GE ding-fei HOU Bei-Ping XIANG Xin-Jian School of Information and Electronic Engineering Zhejiang University of Science and Technology Hangzhou 310012 P. R. China

This article explores the ability of multivariate autoregressive model(MAR)and scalar AR model to extract the features from two-lead electrocardiogram signals in order to classify certain cardiac *** classification performance of four different ECG feature sets based on the model coefficients are *** data in the analysis including normal sinus rhythm, atria premature contraction,premature ventricular contraction,ventricular tachycardia,ventricular fibrillation and superventricular tachyeardia is obtained from the MIT-BIH *** classification is performed using a quadratic diacriminant *** results show the MAR coefficients produce the best results among the four ECG representations and the MAR modeling is a useful classification and diagnosis tool.

关键词：自动诊断多元自回归模型特征提取心电图

Expression changes of nerve cell adhesion molecules L1 and semaphorin 3A after peripheral nerve injury

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Neural Regeneration Research 2016年第12期11卷 2025-2030页

作者： Qian-ru He Meng Cong Qing-zhong Chen Ya-feng Sheng Jian Li Qi Zhang fei ding Yan-pei Gong Jiangsu Key Laboratory of Neuroregeneration Co-Innovation Center of Neuroregeneration Nantong University Nantong Jiangsu Province China Affiliated Hospital of Nantong University Nantong Jiangsu Province China

The expression of nerve cell adhesion molecule L1 in the neuronal growth cone of the central nervous system is strongly associated with the direction of growth of the axon, but its role in the regeneration of the peripheral nerve is still unknown. This study explored the problem in a femoral nerve section model in rats. L1 and semaphorin 3A m RNA and protein expressions were measured over the 4-week recovery period. Quantitative polymerase chain reaction showed that nerve cell adhesion molecule L1 expression was higher in the sensory nerves than in motor nerves at 2 weeks after injury, but vice versa for the expression of semaphorin 3A. Western blot assay results demonstrated that nerve cell adhesion molecule L1 expression was higher in motor nerves than in the sensory nerves at the proximal end after injury, but its expression was greater in the sensory nerves at 2 weeks. Semaphorin 3A expression was higher in the motor nerves than in the sensory nerves at 3 days and 1 week after injury. Nerve cell adhesion molecule L1 and semaphorin 3A expressions at the distal end were higher in the motor nerves than in the sensory nerves at 3 days, 1 and 2 weeks. Immunohistochemical staining results showed that nerve cell adhesion molecule L1 expression at the proximal end was greater in the sensory nerves than in the motor nerves; semaphorin 3A expression was higher in the motor nerves than in the sensory nerves at 2 weeks after injury. Taken together, these results indicated that nerve cell adhesion molecules L1 and semaphorin 3A exhibited different expression patterns at the proximal and distal ends of sensory and motor nerves, and play a coordinating role in neural chemotaxis regeneration.

关键词： nerve regeneration neural cell adhesion molecule L1 semaphorin 3A sensory nerve motor nerve peripheral nerve injury chemotaxis regeneration neural regeneration

Synthesis,characterization,and thermostability of bis(2,2,6,6-tetramethyl-3,5-heptanedionato)copper(Ⅱ)

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Rare Metals 2012年第4期31卷 343-349页

作者： ZHANG Teng,GU Hongwei,ding Fazhu,QU fei,and DAI Shaotao Key Laboratory of Applied Superconductivity,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing China

Owing to the adaptability to large scale processing,excellent composition control and film uniformity,the metal-organic chemical vapor deposition（MOCVD） technique is a promising process for high-temperature superconductor YBa;Cu;O;（YBCO） *** this technique,the evaporation characteristics and thermostability of adopted precursors in whole process will decide the quality and reproducible results of YBCO *** the present report,bis（2,2,6,6-tetramethyl-3,5-heptanedionato）copper（II）(Cu（TMHD）;) was synthesized by the interaction of copper acetate hydrate with TMHD in methanol solution,and its structure was identified by FTIR,1 H NMR,and EI-MS ***,thermal property and the kinetics of decomposition were systematically investigated by nonisothermal thermogravimetric analysis methods（TGA） at different heating rates in streams of N;,and the average apparent activation energy of evaporation process was evaluated by the Ozawa,Kissinger,and Friedman *** possible conversion function was estimated through the Coats-Redfern method to characterize the evaporation patterns and followed a phase boundary reaction mechanism by the contracting area equation with average activation energy of 85.1 kJ·mol;.

关键词： Cu(TMHD)_2 metal-organic chemical vapor deposition(MOCVD) synthesis thermostability

Chemical composition analysis on industrial scale ingots and castings of TiAl alloys

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China Foundry 2020年第6期17卷 441-446页

作者： Xian-fei ding Yi-qun Zhao Jia-bin Zuo Xin Feng Hai Nan Yong-feng Liang Yan-qing Su Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China BAIMTEC Material Co. Ltd.Beijing 100094China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology HarbinHarbin150001China

The chemical composition variation of the TiAl-4722 alloys was examined in a batch of the industrial scale master ingots,and in the corresponding castings prepared by conventional vacuum arc remelting(VAR)combined with induction skull melting(ISM)and investment casting *** content changes of major elements and interstitial elements were evaluated based on the chemical analysis at the top and bottom of the ingots and *** show that the contents of C,N,H,Fe and Si have almost no change in the ingots and castings,suggesting that the chemical analysis on these elements can be based on the batch *** O content keeps almost the same in different ingots,but exhibits relatively large differences in castings,which was probably influenced by the reaction between the shell mold and the molten alloy,and the spalling of face coat of the shell mold during *** the major elements of Al,Nb and Cr,the composition difference between the top and the bottom of the ingots is less than that of the *** for the O element,the trend is different,especially for the castings,suggesting that the investment casting is a homogenization process for Cr and Nb,but a differentiation process for *** contents of major elements in castings fluctuate mainly in the same range as that in the ingots,indicating that the contents of the major elements are controllable during investment casting.

关键词： TiAl alloys melting casting chemical composition casting ingot

Red light induces salicylic acid accumulation by activating CaHY5 to enhance pepper resistance against Phytophthora capsici

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Horticulture Research 2023年第11期10卷 240-252页

作者： Youxin Yang Yu Li Yelan Guang Jinhui Lin Yong Zhou Ting Yu fei ding Yanfeng Wang Jinyin Chen Yanhong Zhou Fengfeng Dang Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits&Vegetables Collaborative Innovation Center of Post-Harvest Key Technology and Quality Safety of Fruits and VegetablesCollege of AgronomyJiangxi Agricultural UniversityNanchang330045China Shaanxi Key Laboratory of Chinese Jujube Yan’an UniversityYan’anShaanxi 716000China Department of Horticulture Zijingang CampusZhejiang UniversityYuhangtang Road 866Hangzhou310058China Fruit Research Institute Fujian Academy of Agricultural scienceFuzhou 350013China School of Life Sciences Liaocheng UniversityLiaocheng 252000China

Pepper(Capsicum annuum L.)is frequently challenged by various pathogens,among which Phytophthora capsici is the most devastating to pepper *** light signal acts as a positive induction of plant resistance against multiple ***,little is known about how the red light signal affects pepper resistance to *** infection(PCI).Here,we report that red light regulates salicylic acid(SA)accumulation by activating elongated hypocotyl5(CaHY5),a basic leucine zipper(bZIP)transcription factor,thereby decreasing pepper susceptibility to *** SA treatment reduced pepper susceptibility to PCI,while silencing of CaPHYB(a red light photoreceptor)increased its *** significantly induced CaHY5 expression,and silencing of CaHY5 reduced SA accumulation,accompanied by decreases in the expression levels of phenylalanine ammonia-lyase 3(CaPAL3),CaPAL7,pathogenesis-related 1(CaPR1),and CaPR1L,which finally resulted in higher susceptibility of pepper to ***,CaHY5 was found to activate the expression of CaPAL3 and CaPAL7,which are essential for SA biosynthesis,by directly binding to their *** analysis revealed that exogenous SA treatment could restore the resistance of CaHY5-silenced pepper plants to ***,this study reveals a critical mechanism through which red light induces SA accumulation by regulating CaHY5-mediated CaPAL3 and CaPAL7 expression,leading to enhanced resistance to ***,red light-induced CaHY5 regulates pepper resistance to PCI,which may have implications for PCI control in protected vegetable production.

关键词： pepper resistance light

Biocompatibility studies of silk fibroin-based artificial nerve grafts in vitro and in vivo

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Progress in Natural Science:Materials International 2007年第9期17卷 1029-1034页

作者： Chen Xuemei,Yang Yumin,Wu Jian,Zhao Yahong,ding fei and Gu Xiaosong(Jiangsu Key Laboratory of Neuroregeneration,Nantong University,Nantong 226001,China) Jiangsu Key Laboratory of Neuroregeneration Nantong University Nantong 226001 China

Silk fibroin(SF)has been used extensively in the biomedical field including tissue engineering for the generation of artificial bones,skins or *** have previously reported on good in vitro biocompatibility of SF fibers with peripheral nerve tissues and *** the present study,we developed a novel design of the SF-based artificial nerve graft(SF graft)which was composed of a SF-nerve guidance conduit(NGC)inserted with SF *** assay was performed to determine the cytotoxicity of the SF-NGC extract fluid on the cultured L929 cells derived from an immortalized mouse fibroblast cell *** addition,this SF graft was implanted into adult rats for bridging a 10-mm long sciatic nerve *** following-up experiments at initial stage(1-4 week)of nerve regeneration including routine blood tests and histochemical investigation were conducted to evaluate the in vivo biocompatibility of the SF graft with peripheral *** results demonstrated that the SF-NGC graft was biocompatible with the surrounding tissues and cells due to its low inflammatory potential with a grade 0 under the *** guidelines and it was generally suitable to a certain degree for bridging peripheral nerve defects in virtue of supporting Schwann cell adherence,expansion and *** the SF graft is a promising alternative to classical autografts for peripheral nerve repair.

关键词： silk fibroin artificial nerve graft nerve guidance conduit biocompatibility cytotoxicity

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密度峰值聚类算法研究进展

软件学报 2022年第5期33卷 1800-1816页

作者：徐晓丁世飞丁玲中国矿业大学计算机科学与技术学院江苏徐州221116 矿山数字化教育部工程研究中心江苏徐州221116

密度峰值聚类(density peaks clustering,DPC)算法是聚类分析中基于密度的一种新兴算法,该算法考虑局部密度和相对距离绘制决策图,快速识别簇中心,完成聚类.DPC具有唯一的输入参数,且无需先验知识,也无需迭代.自2014年提出以来,DPC引起... 详细信息

密度峰值聚类(density peaks clustering,DPC)算法是聚类分析中基于密度的一种新兴算法,该算法考虑局部密度和相对距离绘制决策图,快速识别簇中心,完成聚类.DPC具有唯一的输入参数,且无需先验知识,也无需迭代.自2014年提出以来,DPC引起了学者们的极大兴趣,并得到了快速发展.首先阐述DPC的基本理论,并通过与经典聚类算法比较,分析了DPC的特点;其次,分别从聚类精度和计算复杂度两个角度分析了DPC的弊端及其优化方法,包括局部密度优化、分配策略优化、多密度峰优化以及计算复杂度优化,并介绍了每个类别的主要代表算法;最后介绍了DPC在不同领域中的相关应用研究.对DPC的优缺点提供了全面的理论分析,并对DPC的优化以及应用进行了全面阐述.还试图找出进一步的挑战来促进DPC研究发展.

关键词：密度峰值聚类聚类精度计算复杂度应用