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Grating-free autofocus for single-pixel microscopic imaging

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Photonics Research 2024年第6期12卷 1313-1321页

作者： GUAN WANG HUAXIA DENG YU CAI MENGCHAO MA XIANG ZHONG xinglong gong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China School of Instrument Science and Opto-electronics Engineering Hefei University of TechnologyHefei 230009China

As a computational technology,single-pixel microscopic imaging(SPMI)transfers the target’s spatial information into a temporal *** traditional focusing method of imaging before evaluation is not applicable to the SPMI *** propose a grating-free autofocus strategy derived from the physical mechanism of optical *** the amplitude information of just one high-frequency point in the spectrum is all that is needed to achieve fast autofocus with the SPMI ***,only four patterns need to be cyclically projected,enabling efficient localization of the focal plane based on the measurement *** demonstrate SPMI autofocus experiments at micrometer and even nanometer depths of *** proposed method can be extended to achieve SMPI autofocus with invisible optical pattern illumination.

关键词： optical system illumination

What control the spatial patterns and predictions of runoff response over the contiguous USA?

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Journal of Geographical Sciences 2024年第7期34卷 1297-1322页

作者： JIANG Shanhu DU Shuping REN Liliang gong xinglong YAN Denghua YUAN Shanshui LIU Yi YANG Xiaoli XU Chongyu The National Key Laboratory of Water Disaster Prevention Hohai UniversityNanjing210098China College of Hydrology and Water Resources Hohai UniversityNanjing210098China School of Water Conservancy&Civil Engineering Northeast Agricultural UniversityHarbin150030China Department of Water Resources China Institute of Water Resources and Hydropower ResearchBeijing100038China Department of Geosciences University of OsloOsloNorway

Understanding the nonlinear relationship between hydrological response and key factors and the cause behind this relationship is vital for water resource management and earth system *** this study,we undertook several steps to explore the ***,we partitioned runoff response change(RRC)into multiple components associated with climate and catchment properties,and examined the spatial patterns and smoothness indicated by the Moran's Index of RRC across the contiguous United States(CONUS).Subsequently,we employed a machine learning model to predict RRC using catchment attribute predictors encompassing climate,topography,hydrology,soil,land use/cover,and ***,we identified the primary factors influencing RRC and quantified how these key factors control RRC by employing the accumulated local effect,which allows for the representation of not only dominant but also secondary ***,we explored the relationship between ecoregion patterns,climate gradients,and the distribution of RRC across *** findings indicate that:(1)RRC demonstrating significant connections between catchments tends to be well predicted by catchment attributes in space;(2)climate,hydrology,and topography emerge as the top three key attributes nonlinearly influencing the RRC patterns,with their second-order effects determining the heterogeneous patterns of RRC;and(3)local Moran's I signifies a collaborative relationship between the patterns of RRC and their spatial smoothness,climate space,and ecoregions.

关键词： hydrological response prediction machine learning accumulated local effect Moran’s Index large-sample study

可跳跃移动机器人机构设计与跳跃过程控制研究综述

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机械工程学报 2024年第15期60卷 1-17页

作者：宋荆洲宫兴龙段嘉辰张腾飞北京邮电大学现代邮政学院(自动化学院) 北京100876

近年来,结合传统轮式、腿式运动与跳跃运动的移动机器人受到了研究学者的广泛关注,它们在非结构地形中的优势使其在应急救援、野外巡查、地下勘探等方面有着广阔的应用前景。对目前出现的轮式跳跃机器人、轮腿跳跃机器人、球形跳跃机器... 详细信息

近年来,结合传统轮式、腿式运动与跳跃运动的移动机器人受到了研究学者的广泛关注,它们在非结构地形中的优势使其在应急救援、野外巡查、地下勘探等方面有着广阔的应用前景。对目前出现的轮式跳跃机器人、轮腿跳跃机器人、球形跳跃机器人等新型移动机器人的研究现状进行了较为详细地介绍,从其机构设计与跳跃控制等方面进行了比较分析。在机构设计部分,分析了近年来轮式、轮腿式、球形跳跃机器人的跳跃机构设计特点,对其结构设计特点进行了对比总结;在跳跃控制方法部分,回顾了可跳跃移动机器人的空中姿态控制方法及落地缓冲控制方法。最后从可跳跃移动机器人的结构、储能、智能控制等方面,对其未来的发展方向与技术趋势进行了讨论和展望。

关键词：移动机器人跳跃控制跳跃机构

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残余应力对柔性薄壁连接结构固有频率的影响

实验力学 2024年第2期39卷 149-157页

作者：高梁昝祥李艳邓华夏王宇龚兴龙中国科学技术大学近代力学系中国科学院材料力学行为与设计重点实验室安徽合肥230027 合肥工业大学材料科学与工程学院安徽合肥230009

对于光束线系统中的精密部件而言,线切割加工过程往往会造成部件表面产生残余应力,从而使得精密部件的振动特性与设计预期产生偏差,影响电子束流的稳定性。本文通过对柔性薄壁连接试件固有频率的测量,结合数字图像相关方法和有损切割法... 详细信息

对于光束线系统中的精密部件而言,线切割加工过程往往会造成部件表面产生残余应力,从而使得精密部件的振动特性与设计预期产生偏差,影响电子束流的稳定性。本文通过对柔性薄壁连接试件固有频率的测量,结合数字图像相关方法和有损切割法对薄壁连接处残余应力进行分析,并结合有限元法分析了残余应力对柔性薄壁连接试件的固有频率影响,从而对光束线系统中柔性铰链部件的固有频率与设计值的偏差进行了探究,研究结果可为柔性薄壁连接部件振动特性设计提供依据。

关键词：残余应力柔性铰链固有频率

各向同性磁流变弹性体磁相关非线性动态力学行为的本构模型

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中国科学技术大学学报 2024年第1期54卷 57-68,56,I0002页

作者：汪伯潮李颜逄浩明徐振邦龚兴龙中国科学院材料力学行为与设计重点实验室中国科学技术大学近代力学系安徽合肥230027 中国科学院空间光学系统在轨制造与集成重点实验室中国科学院光学精密机械与物理研究所吉林长春130033

各向同性磁流变弹性体是一种将磁性颗粒随机掺入到聚合物基体中制备而成的智能材料。在磁场作用下,其模量发生快速、可逆、连续变化,在振动控制领域显示出良好的应用前景。实验结果表明,各向同性磁流变弹性体的动态力学行为具有很强的... 详细信息

各向同性磁流变弹性体是一种将磁性颗粒随机掺入到聚合物基体中制备而成的智能材料。在磁场作用下,其模量发生快速、可逆、连续变化,在振动控制领域显示出良好的应用前景。实验结果表明,各向同性磁流变弹性体的动态力学行为具有很强的频率、应变幅值和磁场相关性。尽管上述行为对于其潜在应用具有重要的影响,但目前关于各向同性磁流变弹性体磁相关非线性动态力学行为的理论研究则关注不够。为准确评价各向同性磁流变弹性体的动态力磁耦合行为,并指导其相关产品的设计,本文建立了一个基于连续介质力学理论,反映各向同性磁流变弹性体磁相关非线性动态力学行为的本构模型。随后,开发了和本构模型对应的数值实现算法,并对模型的预测能力进行了验证。该模型有助于深入理解各向同性磁流变弹性体磁相关非线性动态力学行为的潜在力学机制。此外,该模型有助于指导基于各向同性磁流变弹性体产品的设计和应用。

关键词：各向同性磁流变弹性体频率相关应变幅值相关磁相关非线性粘弹本构模型

Hard-magnetic liquid metal droplets with excellent magnetic field dependent mobility and elasticity

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Journal of Materials Science & Technology 2021年第33期92卷 60-68页

作者： Xiaokang He Mingyang Ni Jianpeng Wu Shouhu Xuan xinglong gong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Magnetic liquid metal droplets(MLMDs)have been proven to be very important in many fields such as flexible electronics and soft ***,soft magnetic particles such as nickel(Ni)and iron(Fe)are mixed or suspended into the liquid metal to obtain soft MLMDs(S-LMDs),which can be easily manipulated under the magnetic field due to the favorable deformability and *** addition,hard magnetic particles such as neodymium iron boron(Nd Fe B)with a high residual magnetization can also be dispersed into the liquid metal and the hard MLMDs(H-LMDs)become more compact due to the interaction between internal particles induced by *** work reports a kind of H-LMDs with high surface tension,high flexibility and mechanical robustness,whose electrical conductivity and strength are better than the *** the magnetic field,the H-LMDs have a faster response time(0.58 s)and a larger actuating velocity(4.45 cm/s)than the ***,the H-LMDs show excellent magnetic controllability,good elasticity and favorable mobility,as demonstrated by magnetically actuated locomotion,bounce tests and rolling angle ***,the droplets can be further applied in wheeldriven motors and micro-valve switches,which demonstrates their high application potential in robotic manipulation and microfluidic devices.

关键词： Magnetic liquid metal droplets NdFeB particles Magnetic controllability Micro-valve

Recent progress on the magnetorheological plastomers

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International Journal of Smart and Nano Materials 2015年第2期6卷 135-148页

作者： Shouhu Xuan Yangguang Xu Taixiang Liu xinglong gong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026P.R.China

Different from the traditional magnetorheological(MR)fluids and elastomers,the magnetic particles in the plastic MR materials are not‘deadly’trapped in the polymer matrix;thus,the MR plastomers exhibit higher MR effects and lower *** plastic MR materials have attracted increasing attention,and the relevant fundamental mechanisms and practical applications have been intensively studied due to their unique physical and mechanical *** this highlight,we have mainly reviewed the preparation and the rheological properties of the MR *** formation mechanism of the MR plastomers has also been briefly summarized.

关键词： magnetorheological plastomers MR effects

Research on the construction path of the megacity from the perspective of Nudge Theory:Empirical evidence of the“Park City”construction in Chengdu Tianfu New Area

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中国人口·资源与环境:英文版 2023年第3期21卷 163-171页

作者： Xiaoqin Xie xinglong gong Shaojie Pan School of Public Administration Southwest University of Finance and EconomicsChengdu611130China

The transformation of Chengdu Tianfu New Area,a state-level new district,from the first site of constructing the“Park City”to the representative of the“Park City”,contains a unique path of“Chinese Style Governance”.To expand the diverse paths of constructing megacities,the current research references the nudge theory of behavioral science,adopts the extended case method,and takes Chengdu Tianfu New Area as a typical case to summarize the“nudge”path of“Party City”*** study found that the government achieves the lock-in effect by the priming mechanism and uses the nudge strategy of improving environment and guiding public opinion,thereby helping the people make free *** realizes the framework effect by the salience mechanism and uses the strategies of highlighting key information and optimizing information delivery methods,which directly affects the behavior of the *** achieves the commitment effect by the comparison mechanism,including the horizontal comparison and vertical comparison strategies,and gradually realizes the policy *** realizes the social norm effect by the imitation mechanism and uses the strategies of creating peer pressure and playing celebrity effect,which in turn influence people’s *** the help of the“nudging”mechanism,the construction of the park city has realized the interactive cycle of“government output-citizen feedback”and achieved the goal of“making great change through small actions”.As a new behavioral intervention tool,“nudging”provides an alternative explanation for the construction of the park city in Tianfu New Area and opens up new ideas for the construction of *** study concludes that the construction of megacities can achieve the goal of“common return”through different ways and provides practical inspiration for future urban construction.

关键词： Behavior nudge Megacities Common return through different ways Making great change through small actions

Sonochemical synthesis and characterization of magnetic separable Fe_(3)O_(4)-TiO_(2)nanocomposites and their catalytic properties

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International Journal of Smart and Nano Materials 2010年第4期1卷 278-287页

作者： Wanquan Jiang Xueping Zhang xinglong gong Fangfang Yan Zhong Zhang Department of Chemistry University of Science and Technology of China(USTC)Hefei 230026PR China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUSTCHefei 230027PR China National Center for Nanoscience and Technology Beijing 100080PR China

A novel sonochemical method is described for the preparation of Fe_(3)O_(4)–TiO_(2)photocatalysts in which nanocrystalline titanium dioxide particles are directly coated onto a magnetic *** Fe_(3)O_(4)nanoparticles were partially embedded in TiO_(2)***_(2)nanocrystallites were obtained by hydrolysis and condensation of titanium tetraisopropyl in the presence of ethanol and water under high-intensity ultrasound *** method is attractive since it eliminated the high-temperature heat treatment required in the conventional sol–gel method,which is important in transforming amorphous titanium dioxide into a photoactive crystalline *** comparison to other methods,the developed method is simple,mild,green and *** magnetization hysteresis loop for Fe_(3)O_(4)–TiO_(2)nanocomposites indicates that the hybrid catalyst shows superparamagnetic characteristics at room *** activity studies confirmed that the as-prepared nanocomposites have high photocatalytic ability toward the photodegradation of RhB ***,the photodecomposition rate decreases only slightly after six cycles of the photocatalysis ***,these Fe_(3)O_(4)–TiO_(2)nanocomposites can be served as an effective and conveniently recyclable photocatalyst.

关键词： sonochemical synthesis recyclable photocatalyst TiO_(2)nanocomposite rhodamine B degradation