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Observation of accurately designed bound states in the continuum in momentum space

Photonics Research 2024年第4期12卷 638-647页

作者： jiaju wu JINGGUANG CHEN XIN QI ZHIWEI GUO jiajuN WANG FENG wu YONG SUN YUNHUI LI HAITAO JIANG LEI SHI JIAN ZI HONG CHEN MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Bound states in the continuum(BICs)in artificial photonic structures have received considerable attention since they offer unique methods for the extreme field localization and enhancement of light-matter ***,the symmetry-protected BICs are located at high symmetric points,while the positions of accidental BICs achieved by tuning the parameters will appear at some points in momentum *** to now,to accurately design the position of the accidental BIC in momentum space is still a ***,we theoretically and experimentally demonstrate an accurately designed accidental BIC in a two-coupled-oscillator system consisting of bilayer gratings,where the optical response of each grating can be described by a single resonator *** changing the interlayer distance between the gratings to tune the propagation phase shift related to wave vectors,the position of the accidental BIC can be arbitrarily controlled in momentum ***,we present a general method and rigorous numerical analyses for extracting the polarization vector fields to observe the topological properties of BICs from the polarization-resolved transmission ***,an application of the highly efficient second harmonic generation assisted by quasi-BIC is *** work provides a straightforward strategy for manipulating BICs and studying their topological properties in momentum space.

关键词： polarization tuning resonator

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Observation of maximal intrinsic chirality empowered by dual quasi-bound states in the continuum in a planar metasurface

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Photonics Research 2024年第2期12卷 244-252页

作者： XIN QI jiaju wu FENG wu SONG ZHAO CHAO wu YUEYANG MIN MINA REN YUFEI WANG HAITAO JIANG YUNHUI LI ZHIWEI GUO YAPING YANG WANHUA ZHENG HONG CHEN YONG SUN MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China l3 Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Electrical Engineering Tongji UniversityShanghai 201804China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Metasurfaces with spin-selective transmission play an increasingly critical role in realizing optical chiral responses,especially for strong intrinsic chirality,which is limited to complex three-dimensional *** this paper,we propose a planar metasurface capable of generating maximal intrinsic chirality and achieving dual-band spinselective transmission utilizing dual quasi-bound states in the continuum(quasi-BICs)caused by the structural symmetry ***,the value of circular dichroism(CD)and the transmittance of two kinds of circular polarization states can be arbitrarily controlled by tuning the asymmetry *** CD approaching unity with the maximum transmittance up to 0.95 is experimentally achieved in the dual ***,assisted by chiral BICs,the application in polarization multiplexed near-field image display is also *** work provides a new avenue to flexibly control intrinsic chirality in planar structure and offers an alternative strategy to develop chiral sensing,multiband spin-selective transmission,and high-performance circularly polarized wave *** basic principle and design method of our experiments in the microwave regime can be extended to other bands,such as the terahertz and infrared wavelengths.

关键词： planar intrinsic quasi

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磁阻式旋转变压器解码系统设计

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传感器与微系统 2024年第1期43卷 111-114,119页

作者：钟旺陈亮亮祝长生伍家驹危水根南昌航空大学信息工程学院江西南昌330063 浙江大学电气工程学院浙江杭州310027

在高性能电机的闭环控制系统中,旋转变压器(简称旋变)常用于测量电机转子的位置与速度信息,设计了一种以专用旋变数字转换芯片为核心的磁阻式旋变解码系统,用于将旋变输出的正余弦信号解码为转子的位置信息。解码系统包括主芯片模块、... 详细信息

在高性能电机的闭环控制系统中,旋转变压器(简称旋变)常用于测量电机转子的位置与速度信息,设计了一种以专用旋变数字转换芯片为核心的磁阻式旋变解码系统,用于将旋变输出的正余弦信号解码为转子的位置信息。解码系统包括主芯片模块、旋变输入信号调理模块、励磁缓冲电路模块和电源模块等,将各功能模块集成在一块印刷电路板(PCB)上,并通过实验验证了设计方案的有效性。实验结果表明:设计的磁阻式旋变解码系统运行稳定,能实时准确地输出电机转子的位置与速度信息。

关键词：磁阻式旋转变压器旋变数字转换芯片电路设计解码器

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Steerable merging bound states in the continuum on a quasi-flatband of photonic crystal slabs without breaking symmetry

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光子学研究:英文版 2023年第7期11卷 1262-1274页

作者： XIN QI jiaju wu FENG wu MINA REN QIAN WEI YUFEI WANG HAITAO JIANG YUNHUI LI ZHIWEI GUO YAPING YANG WANHUA ZHENG YONG SUN HONG CHEN MOE Key Laboratory of Advanced Micro-structured Materials School of Physics Sciences and EngineeringTongji UniversityShanghai 200092China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Department of Electrical Engineering Tongji UniversityShanghai 201804China

Optical resonators with high quality(Q)factors are paramount for the enhancement of light–matter interactions in engineered photonic structures,but their performance always suffers from the scattering loss caused by fabrication *** bound states in the continuum(BICs)provide us with a nontrivial physical mechanism to overcome this challenge,as they can significantly improve the Q factors of ***,most of the reported merging BICs are found atΓpoint(the center of the Brillouin zone),which intensively limits many potential applications based on angular *** date,studies on manipulating merging BICs at off-Γpoint are always accompanied by the breaking of structural symmetry that inevitably increases process difficulty and structural defects to a certain ***,we propose a scheme to construct merging BICs at almost an arbitrary point in momentum space without breaking *** by the topological features of BICs,we merge four accidental BICs with one symmetry-protected BIC at theΓpoint and merge two accidental BICs with opposite topological charges at the off-Γpoint only by changing the periodic constant of a photonic crystal ***,the position of off-Γmerging BICs can be flexibly tuned by the periodic constant and height of the structure ***,it is observed that the movement of BICs occurs in a quasi-flatband with ultra-narrow ***,merging BICs in a tiny band provide a mechanism to realize more robust ultrahigh-Q resonances that further improve the optical performance,which is limited by wide-angle ***,as an example of application,effective angle-insensitive second-harmonic generation assisted by different quasi-BICs is numerically *** findings demonstrate momentum-steerable merging BICs in a quasi-flatband,which may expand the application of BICs to the enhancement of frequency-sensitive light–matter interaction with angular selectivit

关键词： quasi symmetry breaking

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Ruxolitinib improves the inflammatory microenvironment,restores glutamate homeostasis,and promotes functional recovery after spinal cord injury

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Neural Regeneration Research 2024年第11期19卷 2499-2512页

作者： Jiang Cao Xiao Yu Jingcheng Liu jiaju Fu Binyu Wang Chaoqin wu Sheng Zhang Hongtao Chen Zi Wang Yinyang Xu Tao Sui Jie Chang Xiaojian Cao Department of Orthopedics The First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu ProvinceChina Department of Trauma Surgery Subei People’s Hospital of JiangsuClinical Medical College of Yangzhou UniversityYangzhouJiangsu ProvinceChina Department of Orthopedics Zhongda HospitalSoutheast UniversityNanjingJiangsu ProvinceChina Department of Orthopedic Surgery Nanjing Drum Tower HospitalThe Affiliated Hospital of Medical School of Nanjing UniversityNanjingJiangsu ProvinceChina

The inflammatory microenvironment and neurotoxicity can hinder neuronal regeneration and functional recovery after spinal cord ***,a JAK-STAT inhibitor,exhibits effectiveness in autoimmune diseases,arthritis,and managing inflammatory cytokine *** studies have shown the neuroprotective potential of ruxolitinib in neurological trauma,the exact mechanism by which it enhances functional recovery after spinal cord injury,particularly its effect on astrocytes,remains *** address this gap,we established a mouse model of T10 spinal cord contusion and found that ruxolitinib effectively improved hindlimb motor function and reduced the area of spinal cord *** sequencing analysis showed that ruxolitinib alleviated inflammation and immune response after spinal cord injury,restored EAAT2 expression,reduced glutamate levels,and alleviated excitatory ***,ruxolitinib inhibited the phosphorylation of JAK2 and STAT3 in the injured spinal cord and decreased the phosphorylation level of nuclear factor kappa-B and the expression of inflammatory factors interleukin-1β,interleukin-6,and tumor necrosis factor-α.Additionally,in glutamate-induced excitotoxicity astrocytes,ruxolitinib restored EAAT2 expression and increased glutamate uptake by inhibiting the activation of STAT3,thereby reducing glutamate-induced neurotoxicity,calcium influx,oxidative stress,and cell apoptosis,and increasing the complexity of dendritic ***,these results indicate that ruxolitinib restores glutamate homeostasis by rescuing the expression of EAAT2 in astrocytes,reduces neurotoxicity,and effectively alleviates inflammatory and immune responses after spinal cord injury,thereby promoting functional recovery after spinal cord injury.

关键词： astrocytes EAAT2 excitotoxicity glutamate homeostasis JAK-STAT pathway locomotor function neurotoxicity ruxolitinib spinal cord injury transcriptome analysis

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小型变压器优化设计的可视化算法

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高电压技术 2023年第12期49卷 5282-5291页

作者：伍家驹蔡智恒谢光元陈亮亮南昌航空大学信息工程学院南昌330063 深圳京泉华科技股份有限公司深圳518110

小型变压器工况复杂,参数具有多值非线性、环境依赖性和不易检测性,需自行研发。设计对产品性价比的贡献率高达70%,但大多数变压器却仍出自可行设计,优化设计能在诸约束下能兼顾多目标,但其多元非线性方程常既无解析解又难觅有用数值解... 详细信息

小型变压器工况复杂,参数具有多值非线性、环境依赖性和不易检测性,需自行研发。设计对产品性价比的贡献率高达70%,但大多数变压器却仍出自可行设计,优化设计能在诸约束下能兼顾多目标,但其多元非线性方程常既无解析解又难觅有用数值解。因此,该文提出一种可视化算法进行优化设计:用3维空间的色谱对应于第4维的值域,用多目标约束交并集的空间分布来交互择优;为反映漆包线和磁芯市价,提出以窗口矩形系数作为决策变量;为降低损耗成本,以非同心绕组的漏感取代LC滤波器中的电感器。该文给出了设计数据和实验结果,并通过与同类变压器的数据对比来验证优化设计的效果;并结合数学模型,分段给出了程序代码及其所生成的图像,该4维可视化算法能对其他优化设计提供参考。

关键词：小型变压器优化设计可视化 4D 算法

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基于多维可视化的高速永磁电机转子强度优化设计

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振动与冲击 2022年第18期41卷 236-243页

作者：涂之艺陈亮亮伍家驹马航熊茹吴剑李志农南昌航空大学信息工程学院南昌330063 国网江西省电力有限公司供电服务管理中心南昌330077 南昌航空大学无损检测技术教育部重点实验室南昌330063

在高速永磁电机中,永磁体机械强度不足以承受高速旋转产生的离心力,需要用高强度非导磁金属护套来保护永磁材料。针对高速永磁电机中实心圆柱永磁转子结构,将转子的应力条件简化为平面应力问题,采用极坐标下的位移法,推导了非导磁金属... 详细信息

在高速永磁电机中,永磁体机械强度不足以承受高速旋转产生的离心力,需要用高强度非导磁金属护套来保护永磁材料。针对高速永磁电机中实心圆柱永磁转子结构,将转子的应力条件简化为平面应力问题,采用极坐标下的位移法,推导了非导磁金属护套保护的圆柱永磁转子强度解析公式。在此基础上,运用多维可视化算法研究了护套厚度、过盈量以及转速对转子强度的影响,对各多维可视化图形进行交集运算,得到了静态和高速运行状态下均满足强度要求的护套厚度及过盈量的可行域,在可行域中选择设计参数的最优值,最后,借助有限元法验证了设计方案的有效性。结果表明,提出的基于多维可视化的优化设计方法能够得到护套厚度及过盈量的集状解,便于实现鲁棒优化,具有直观、方便的特点。

关键词：高速永磁电机强度计算有限元可视化算法

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电子变压器参数的一种间接测算方法(英文)

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电工技术学报 2006年第12期21卷 26-34页

作者：伍家驹杉本英彦南昌航空工业学院无损检测技术教育部重点实验室南昌330034 福井大学

电子变压器的精确参数值对电力电子电路来说是非常重要的,研究时常将分布参数等效成集中参数。在开关状态下变压器的多值非线性、分布效应和趋肤接近效应都更加凸显,测量方法直接关系到参数值的测算结果。本文提出了通过额定电压满负载... 详细信息

电子变压器的精确参数值对电力电子电路来说是非常重要的,研究时常将分布参数等效成集中参数。在开关状态下变压器的多值非线性、分布效应和趋肤接近效应都更加凸显,测量方法直接关系到参数值的测算结果。本文提出了通过额定电压满负载条件下阶跃响应来间接地测算常规模型中的集中参数的方法,仿真结果较好地吻合了实验波形,明显优于常规的测算方法。文中还从仿真元素度量的准确度评判、阶跃激励下的物理过程和变压器实验时的电磁环境等角度对测算方法作了较详细的分析比较。

关键词：电子变压器仿真参数测算试验

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Differencial-Clustering:Mining Bicluster Based on Weighted Graph in Microarray Dataset

Differencial-Clustering:Mining Bicluster Based on Weighted G...

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2013年中国智能自动化学术会议

作者： Jingni Diao Cuifang Zheng Jilan Zhang jiaju wu Institution of Computer Application China Academy of Engineering Physics

In this study,we discuss methods of mining differential biclusters on gene expression data.A differential bicluster is a set of genes corresponding to samples which have substantially different expression values in two sample *** differential clusters may have meaningful biology significance that some specified experimental conditions are key factor to gene expression values and certain genes are sensitive to these *** general,most of bicluster algorithms follow a respective clustering framework that they mine clusters in two ***,this strategy leads to low efficiency in term of *** proposed a novel algorithm:Differencial-Clustering with the strategy which mine differential biclusters directly on weighted graph corresponding to two sample *** main contribution of our algorithm is that we avoid the respective cluster generation in two classes and comparison *** compare our algorithm with standard subspace clustering method,the experimental result analysis demonstrate our main contribution.

关键词： Differential bicluster Subspace clustering Differential graphs

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考虑温升梯度影响的表贴式高速永磁电机转子强度分析

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振动与冲击 2022年第1期41卷 187-195页

作者：陈亮亮冯惊鸿熊茹祝长生伍家驹李志农南昌航空大学无损检测技术教育部重点实验室南昌330063 南昌航空大学信息工程学院南昌330063 国网江西省电力有限公司供电服务管理中心南昌330077 浙江大学电气工程学院杭州310027

针对非导磁金属护套表贴式高速永磁电机的转子强度分析问题,基于弹性力学的平面应力模型,采用极坐标下的位移法,推导了考虑静态过盈量、转速以及转子温升梯度影响的转子强度解析解,并通过有限元仿真和试验验证了解析解的有效性。在转子... 详细信息

针对非导磁金属护套表贴式高速永磁电机的转子强度分析问题,基于弹性力学的平面应力模型,采用极坐标下的位移法,推导了考虑静态过盈量、转速以及转子温升梯度影响的转子强度解析解,并通过有限元仿真和试验验证了解析解的有效性。在转子强度解析解的基础上,进一步研究了护套厚度、静态过盈量、转速及转子温度等参数对转子应力的影响。仿真及试验结果表明:解析解能够准确计算考虑温升梯度影响的表贴式高速永磁电机转子的径向应力、环向应力及等效Mises应力。高速离心力和转子发热使永磁体内的拉应力大幅增加,同时也增加了护套所承受的Mises等效应力。适当增加静态过盈量和护套厚度可增强永磁体内的预压力,使永磁体免受高速离心力及转子发热产生的拉应力所破坏。

关键词：高速永磁电机非导磁金属护套解析解强度分析热应力

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