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Fault locating for traveling-wave accelerators based on transmission line theory

Nuclear Science and Techniques 2023年第8期34卷 24-34页

作者： Tong-Ning Hu Hai-Meng Wang Yi-feng Zeng Hong-Jie Xu Li Chen guang-yao feng Yuan-Ji Pei State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Grid Fujian Economic Research Institute Fuzhou 350012China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Radio-frequency(RF)breakdown analysis and location are critical for successful development of high-gradient traveling-wave(TW)accelerators,especially those expected to generate high-intensity,high-power *** with commonly used schemes involving dedicated devices or complicated techniques,a convenient approach for breakdown locating based on transmission line(TL)theory offers advantages in the typical constant-gradient TW-accelerating *** deliver such an approach,an equivalent TL model has been constructed to equate the TW-accelerating structure based on the fun-damental theory of the TL transient response in the time *** equivalence relationship between the TW-accelerating structure and the TL model has been established via analytical derivations associated with grid charts and verified by TL circuit ***,to validate the proposed fault-locating method in practical applications,an elaborate analysis via such a method has been conducted for the recoverable RF-breakdown phenomena observed at an existing prototype of a TW-accelerating-structure-based beam injector constructed at the Huazhong University of Science and *** addition,further considerations and discussion for extending the applications of the proposed method have been *** breakdown-locating approach involving the transient response in the framework of TL theory can be a conceivable supple-ment to existing methods,facilitating solution to construction problems at an affordable cost.

关键词： Traveling-wave structure RF breakdown Fault locating Transmission line

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Beam based alignment using a neural network

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Nuclear Science and Techniques 2024年第4期35卷 108-118页

作者： Guan-Liang Wang Ke-Min Chen Si-Wei Wang Zhe Wang Tao He Masahito Hosaka guang-yao feng Wei Xu National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Diamond Light Source Oxfordshire OX110DEUK

Beams typically do not travel through the magnet centers because of errors in storage *** beam deviating from the quadrupole centers is affected by additional dipole fields due to magnetic field ***-based alignment(BBA)is often performed to determine a golden orbit where the beam circulates around the quadrupole center *** storage rings with many quadrupoles,the conventional BBA procedure is time-consuming,particularly in the commissioning phase,because of the necessary iterative *** addition,the conventional BBA method can be affected by strong coupling and the nonlinearity of the storage ring *** this study,a novel method based on a neural network was proposed to determine the golden orbit in a much shorter time with reasonable *** golden orbit can be used directly for operation or adopted as a starting point for conventional *** method was demonstrated in the HLS-II storage ring for the first time through simulations and online *** results of the experiments showed that the golden orbit obtained using this new method was consistent with that obtained using the conventional *** development of this new method and the corresponding experiments are reported in this paper.

关键词： Golden orbit Beam-based alignment Neural network Storage ring

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Research and development of a 0.5-m-long helical superconducting undulator prototype

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Nuclear Science and Techniques 2024年第10期35卷 86-95页

作者： Xiang-Chen Yang Xiao-Wu Yu Jun-Hao Wei Xiang-Zhen Zhang Zi-Lin Chen Xiao-Juan Bian He-Ting Li guang-yao feng Yu-Hui Li National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Plasma Physics Chinese Academy of Sciences(ASIPP)Hefei 230031China China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan 523000China

The helical undulator is in high demand in synchrotron radiation facilities for circular polarization *** to the higher field strength provided by the superconducting undulator compared to the conventional permanent-magnet undulator,greater research efforts should be directed toward this *** helical superconducting undulator holds great potential in synchrotron radiation facilities,especially in low-energy storage rings that seek circularly polarized radiation with the highest possible radiation *** the successful development of planar superconducting undulators,the Institute of High Energy Physics conducted research and development for the helical superconducting undulator.A 0.5-m-long Deltatype superconducting undulator prototype was developed and *** information on the design,fabrication,and cryogenic testing of the prototype is presented and discussed.

关键词： Helical Superconducting undulator Delta

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An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

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Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping Ding Liyun Wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou feng Ding Yue Hu Jin Zhang Yagang yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory

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半球型介质加载的单极子天线的全波分析

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宇航计测技术 2005年第1期25卷 26-29页

作者：姚广锋王积勤空军工程大学导弹学院陕西三原713800

对轴对称柱坐标的时域有限差分方法进行了详细的讨论 ,并将完全匹配层吸收边界条件推广到圆柱坐标系。使用时域有限差分方法对半球型介质加载的单极子天线进行了全波分析 ,给出了其S参数曲线和输入阻抗的数值计算结果 ,并与文献结果进... 详细信息

对轴对称柱坐标的时域有限差分方法进行了详细的讨论 ,并将完全匹配层吸收边界条件推广到圆柱坐标系。使用时域有限差分方法对半球型介质加载的单极子天线进行了全波分析 ,给出了其S参数曲线和输入阻抗的数值计算结果 ,并与文献结果进行了比较 ,吻合较好。

关键词：全波分析单极子天线时域有限差分方法输入阻抗 S参数吸收边界条件完全匹配层圆柱坐标系介质轴对称

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Nanocarrier-mediated siRNA delivery:a new approach for the treatment of traumatic brain injury-related Alzheimer's disease

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Neural Regeneration Research 2025年第9期20卷 2538-2555页

作者： Jie Jin Huajing Zhang Qianying Lu Linqiang Tian Sanqiao yao feng Lai Yangfan Liang Chuanchuan Liu Yujia Lu Sijia Tian Yanmei Zhao Wenjie Ren Institute of Disaster and Emergency Medicine Tianjin UniversityTianjinChina Key Laboratory for Disaster Medicine Technology TianjinChina Henan Medical Key Laboratory for Research of Trauma and Orthopedics The Third Affiliated Hospital of Xinxiang Medical UniversityXinxiangHenan ProvinceChina Clinical Medical Center of Tissue Engineering and Regeneration Xinxiang Medical UniversityXinxiangHenan ProvinceChina Institutes of Health Central Plain Xinxiang Medical UniversityXinxiangHenan ProvinceChina School of Public Health Xinxiang Medical UniversityXinxiangHenan ProvinceChina

Traumatic brain injury and Alzheimer's disease share pathological similarities,including neuronal loss,amyloid-βdeposition,tau hyperphosphorylation,blood-brain barrier dysfunction,neuroinflammation,and cognitive ***,traumatic brain injury can exacerbate Alzheimer's disease-like pathologies,potentially leading to the development of Alzheimer's *** offer a potential solution by facilitating the delive ry of small interfering RNAs across the blood-brain barrier for the targeted silencing of key pathological genes implicated in traumatic brain injury and Alzheimer's disease.U nlike traditional approaches to neuro regeneration,this is a molecula r-targeted strategy,thus avoiding non-specific drug *** review focuses on the use of nanocarrier systems for the efficient and precise delive ry of siRNAs,discussing the advantages,challenges,and future *** principle,siRNAs have the potential to target all genes and non-targetable protein s,holding significant promise for treating various *** the various therapeutic approaches currently available for neurological diseases,siRNA gene silencing can precisely"turn off"the expression of any gene at the genetic level,thus radically inhibiting disease progression;however,a significant challenge lies in delivering siRNAs across the blood-brain *** have received increasing attention as an innovative drug delive ry tool fo r the treatment of brain *** are considered a potential therapeutic strategy with the advantages of being able to cross the blood-brain barrier,targeted drug delivery,enhanced drug stability,and multifunctional *** use of nanoparticles to deliver specific modified siRNAs to the injured brain is gradually being recognized as a feasible and effective *** this strategy is still in the preclinical exploration stage,it is expected to achieve clinical translation in the future,creating a new field of molecular tar

关键词： blood-brain barrier cognitive dysfunction exosomes gene silencing immunotherapy inorganic nanomaterials liposome nanoparticles neuroinflammation polymer nanoparticles stem cells

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Mainchain conformation ordering self-assembly tailored room temperature phosphorescence emission

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Science China Chemistry 2025年第01期 329-336页

作者： Yuzhu Li Yumeng Gao feng Tian Yu Wang Yuan yao Shaoliang Lin Xiang Ma Binbin Xu Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Key Laboratory for Advance Materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science & Technology

Developing organic room-temperature phosphorescence （RTP） materials with a wide range of tunable-emission is significant in expanding the applications of RTP ***,we rationally designed amphiphilic alternating copolymers poly(1,2-bis（4-alkoxyphenyl）ethane-1,2-dione-alt-（ethylene glycol）x)(P（Bz-alt-EGx）) that combined the advantage of alternating benzil and EGxskeleton,and tunable mainchain *** a mainchain conformation ordering assembly （COA） process,P（Bz-alt-EGx） self-assembled into well-defined platelets,and such assemblies emitted blue RTP at ca.425 nm due to the ordered folded-chain conformation and confined *** contrast,traditional self-assembly （TA） of P（Bz-alt-EGx） obtained less ordered aggregates,such as asymmetric worms,vesicles,and rod-like *** resultant less ordered aggregates exhibited yellow-green RTP at ca.550 *** wide-tuning RTP emission in solution （between blue and yellow-green,over125 nm） is realized using the P（Bz-alt-EGx） alternating copolymers under the treatment of different self-assembly *** study uncovers a new strategy to tailor the RTP emission through different self-assembly pathways and holds great promise for the fabrication of advanced optical materials.

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一种半全息圆柱扫描成像新方法

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微波学报 2023年第6期39卷 55-60页

作者：张继康张继龙姚广峰王栋苏州威陌电子信息科技有限公司苏州215312 中国人民解放军93221部队北京100085 北京敏视达雷达有限公司北京100094

在采用一维线阵进行圆柱扫描成像时,若一维线阵为一发多收或多发多收,并且所有线阵单元同时接收信号,则此时合成的二维柱面阵列为半全息阵列,即沿一维线阵方向为常规阵列或半主动阵列,沿柱面扫描方向为全息阵列,对于这种半全息阵列,现... 详细信息

在采用一维线阵进行圆柱扫描成像时,若一维线阵为一发多收或多发多收,并且所有线阵单元同时接收信号,则此时合成的二维柱面阵列为半全息阵列,即沿一维线阵方向为常规阵列或半主动阵列,沿柱面扫描方向为全息阵列,对于这种半全息阵列,现有的常规计算成像方法失效。虚拟透镜成像技术是一种全新的成像技术,可兼容不同的技术体制,并且适用于远、中、近以及超近距离目标的成像。为了解决上述半全息圆柱扫描成像难题,针对半全息阵列的特点,深入研究了虚拟透镜成像技术,提出了一种半全息圆柱扫描快速成像算法,最后进行了成像仿真,仿真结果验证了新算法的有效性。

关键词：虚拟透镜成像微波成像微波全息成像转台成像圆柱扫描成像

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超近距离目标的虚拟透镜成像技术研究

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中国电子科学研究院学报 2023年第3期18卷 253-257页

作者：张继龙张继康姚广峰王栋苏州威陌电子信息科技有限公司江苏苏州215312 中国人民解放军93221部队北京100085 北京敏视达雷达有限公司北京100094

虚拟透镜成像技术是一种成像新技术,能够兼容不同的技术体制,并且适用于远、中、近不同距离目标的成像。虚拟透镜成像技术应用于超近距离目标的成像时,会出现成像失真甚至无法有效成像的问题。针对超近距离目标成像效果变差问题,通过分... 详细信息

虚拟透镜成像技术是一种成像新技术,能够兼容不同的技术体制,并且适用于远、中、近不同距离目标的成像。虚拟透镜成像技术应用于超近距离目标的成像时,会出现成像失真甚至无法有效成像的问题。针对超近距离目标成像效果变差问题,通过分析虚拟透镜成像算法的成像聚焦机理,深入研究傍轴近似引起的相移误差对聚焦性能的影响,给出了最大相移误差与最小焦距之间的关系,提出了幅度加权降低傍轴近似引起的相移误差影响的方案,改善了超近距离目标的成像效果,仿真结果验证了所提方法的有效性。

关键词：虚拟透镜成像微波成像雷达超近距离幅度加权

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Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang feng Gao Yu-Gui Peng Peng Wu Zong-Lin Li Xue-feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

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