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Acta Mechanica Solida Sinica 2023年第6期36卷 884-898页

作者： Yangfan Li jiachen guo Hengyang Li Huihan Chen Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Theoretical and Applied Mechanics Program Northwestern UniversityEvanstonIL 60208USA Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

Current multiscale topology optimization restricts the solution space by enforcing the use of a few repetitive microstructures that are predetermined,and thus lack the ability for structural concerns like buckling strength,robustness,and ***,in this paper,a new multiscale concurrent topology optimization design,referred to as the self-consistent analysis-based moving morphable component(SMMC)method,is *** with the conventional moving morphable component method,the proposed method seeks to optimize both material and structure simultaneously by explicitly designing both macrostructure and representative volume element(RVE)-level *** examples with transducer design requirements are provided to demonstrate the superiority of the SMMC method in comparison to traditional *** proposed method has broad impact in areas of integrated industrial manufacturing design:to solve for the optimized macro and microstructures under the objective function and constraints,to calculate the structural response efficiently using a reduced-order model:self-consistent analysis,and to link the SMMC method to manufacturing(industrial manufacturing or additive manufacturing)based on the design requirements and application areas.

关键词： Topology optimization Moving morphable component method Multiscale concurrent design Reduced-order model

A Simplified Model for Buckling and Post-Buckling Analysis of Cu Nanobeam Under Compression

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Computer Modeling in Engineering & Sciences 2020年第11期125卷 611-623页

作者： jiachen guo Yunfei Xu Zhenyu Jiang Xiaoyi Liu Yang Cai Department of Engineering Mechanics South China University of TechnologyGuangzhou510640China The Peac Institute of Multiscale Sciences Chengdu610031China

Both of Buckling and post-buckling are fundamental problems of geometric nonlinearity in solid *** the rapid development of nanotechnology in recent years,buckling behaviors in nanobeams receive more attention due to its applications in sensors,actuators,transistors,probes,and resonators in nanoelectromechanical systems(NEMS)and *** this work,buckling and post-buckling of copper nanobeam under uniaxial compression are investigated with theoretical analysis and atomistic *** cross sections are explored for the consideration of surface *** avoid complicated high order buckling modes,a stressbased simplified model is proposed to analyze the critical strain for buckling,maximum deflection,and nominal failure strain for *** effects should be considered regarding critical buckling strain and the maximum post-buckling *** critical strain increases with increasing nanobeam cross section,while themaximumdeflection increases with increasing loading strain but stays nearly the same for different cross sections,and the underlying mechanisms are revealed by our *** maximum deflection is also influenced by surface *** nominal failure strains are captured by our simulations,and they are in good agreement with the simplified *** results can be used for helping design strain gauge sensors and nanodevices with self-detecting ability.

关键词： Nanobeam buckling post-buckling simplified model atomistic simulation

Joint optimization of sampling interval and control for condition-based maintenance using availability maximization criterion

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Journal of Systems Engineering and Electronics 2018年第1期29卷 203-215页

作者： LI Xin CAI Jing ZUO Hongfu LIU Ruochen CHEN Xi guo jiachen College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Automobile and Traffic Engineering Jiangsu University of TechnologyChangzhou 213001China Shanghai Aircraft Customer Service Co. Ltd.Shanghai 200241China

Most of the maintenance optimization models in condition-based maintenance(CBM) consider the cost-optimal criterion, but few papers have dealt with availability maximization for maintenance applications. A novel optimal Bayesian control approach is presented for maintenance decision making. The system deterioration evolves as a three-state continuous time hidden semi-Markov process. Considering the optimal maintenance policy, the multivariate Bayesian control scheme based on the hidden semi-Markov model(HSMM) is developed, the objective is to maximize the long-run expected average availability per unit time. The proposed approach can optimize the sampling interval and control limit jointly. A case study using Markov chain Monte Carlo(MCMC)simulation is provided and a comparison with the Bayesian control scheme based on hidden Markov model(HMM), the age-based replacement policy, Hotelling’s T2, multivariate exponentially weihted moving average(MEWMA) and multivariate cumulative sum(MCUSUM) control charts is given, which illustrates the effectiveness of the proposed method.

关键词： condition-based maintenance(CBM) availability maximization Markov chain Monte Carlo(MCMC) hidden semiMarkov model(HSMM) Bayesian control sampling interval

A succinct enhanced luminescence strategy for fluorescent ionic liquids and the application for detecting CO_(2)

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Green Energy & Environment 2022年第5期7卷 1093-1101页

作者： Siying Che jiachen guo Lu Gan Qiaoxin Xiao Haoran Li Yuanbin She Congmin Wang College of Chemical Engineering Zhejiang University of TechnologyHangzhou310014China Department of Chemistry ZJU-NHU United R&D CenterZhejiang UniversityHangzhou310027China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang UniversityHangzhou310027China

An interesting phenomenon was found that fluorophore was introduced into ionic liquid(IL)to magnify fluorescence signal via the thermally activated delayed fluorescence process;thus up to 15 fold enhancements were ***,we reported a succinct enhanced luminescence strategy to reduce single-triplet energy split by the tunability of *** strategy could be extended to more kinds of ILs by the virtue of a preliminary DFT calculation ***,the optical feature of IL sensor made it a promising candidate as a gas fluorescence sensor.

关键词： luminescence ionic liquids

Design of functionalized fluorescent ionic liquid and its application for achieving significant improvements in Al^3t detecting

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Green Energy & Environment 2020年第2期5卷 195-202页

作者： Lu Gan jiachen guo Siying Che Qiaoxin Xiao Mingyang Wang Jienan You Congmin Wang School of Chemistry Zhejiang UniversityHangzhou310027China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang UniversityHangzhou310027China

Specific fluorophore was introduced into ionic liquid based on its tunability,thus a kind of novel fluorescent ionic liquid probe[P66614][HQS]was designed,synthesized and *** with non-fluorescent HQS,ionic liquid[P66614][HQS]emitted a certain amount of fluorescence,which could be attributed to the well-delocalized frontier orbitals and its charge transfer character,as demonstrated by quantum chemical *** the interaction of[P66614][HQS]with metal ions,the application for detecting specific substance as a chemical sensor,such as Al3+was *** with the traditional probe HQS,significant improvements in Al^3+detecting was achieved by[P66614][HQS]with stronger binding ability,better sensitivity and *** better performance of[P66614][HQS]was contributed to the changed charge distribution,leading to the stronger binding *** believe that this new fluorescent ionic liquid exhibited unique properties in detecting Al^3+in aqueous solution,which would broaden the application of ionic liquids.

关键词： Ionic liquid Fluorescent probe Al^3+ Significant improvements

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基体取向对激光熔覆修复区域杂晶形成的影响

中国激光 2021年第6期48卷 127-136页

作者：荣鹏郭嘉琛成都飞机工业(集团)有限责任公司四川成都610000 西北工业大学理学院陕西西安710072

镍基单晶高温合金叶片的表面缺陷修复是实现其制造及延寿技术的关键,也是材料物理与化学学科的热点研究问题。提出了一种激光熔凝二次旋转基体修复单晶合金的新方法,采用实验与理论模型相结合的方式,以DD6镍基高温合金为研究对象,探究了... 详细信息

镍基单晶高温合金叶片的表面缺陷修复是实现其制造及延寿技术的关键,也是材料物理与化学学科的热点研究问题。提出了一种激光熔凝二次旋转基体修复单晶合金的新方法,采用实验与理论模型相结合的方式,以DD6镍基高温合金为研究对象,探究了绕[010]方向旋转45°、再沿[001]方向旋转不同角度ξ时不同晶向区域的分布变化规律。实验结果表明,随着ξ的增大,熔池内一侧单一晶向区域分布增大,同时获得了可使熔池一侧只存在单一晶区的基体取向(11√2)[√201](即ξ=45°)。本研究揭示了激光熔凝单晶高温合金过程中改变基体晶向对外延生长组织内部杂晶形成能力的影响机制,并为修复单晶高温合金叶片表面缺陷的激光熔覆修复技术提供了全新的优化思路。

关键词：激光技术单晶高温合金叶片激光熔覆修复技术基体取向敏感度

自适应生成卷积核的动态图注意力三维点云识别及分割

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湖南大学学报（自然科学版） 2024年第12期51卷 139-152页

作者：杨军郭佳晨兰州交通大学电子与信息工程学院甘肃兰州730070 兰州交通大学自动化与电气工程学院甘肃兰州730070

针对现有算法在对点云数据进行平移、缩放以及旋转等几何变换时网络不能充分提取局部特征,导致网络精度显著下降的问题,提出基于自适应生成卷积核的动态图注意力三维点云识别及分割算法.首先,利用感受野中心点位置信息增强邻点感知上下... 详细信息

针对现有算法在对点云数据进行平移、缩放以及旋转等几何变换时网络不能充分提取局部特征,导致网络精度显著下降的问题,提出基于自适应生成卷积核的动态图注意力三维点云识别及分割算法.首先,利用感受野中心点位置信息增强邻点感知上下文信息能力,通过改进的自注意力机制重构感受野,使感受野内特征信息充分交互,增强感受野的上下文信息.其次,构造自适应生成卷积核,通过捕获变化的点云拓扑信息,自适应生成卷积核权重,进而提升网络性能.最后,构建动态图注意力卷积算子,并设计点云识别的动态网络与分割的U形网络.实验结果表明,本文算法在ModelNet40点云识别数据集的识别精度达到了94.0%,在ShapeNet Part点云部件语义分割数据集的平均交并比达到了86.2%.本文算法能够提取三维点云的关键特征信息,具有较好的三维点云识别与分割能力.

关键词：三维点云动态图注意力卷积自适应算法模型识别语义分割

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刚性陶瓷隔热瓦涂层的发展及其表面性质

材料导报 2016年第19期30卷 119-126页

作者：郭琳琳陶鑫郭安然刘家臣天津大学材料科学与工程学院先进陶瓷与加工技术教育部重点实验室天津300350 沧州师范学院化学与化工学院沧州061000

刚性陶瓷隔热瓦涂层是隔热结构热防护系统的重要组成部分,涂层的基本要求是要与隔热瓦相匹配,提供必要的防水、抗冲击、抗热震性能。作为高温热防护系统的关键材料,涂层的耐高温性能尤其重要。辐射性和催化性能是涂层的两个重要表面性质... 详细信息

刚性陶瓷隔热瓦涂层是隔热结构热防护系统的重要组成部分,涂层的基本要求是要与隔热瓦相匹配,提供必要的防水、抗冲击、抗热震性能。作为高温热防护系统的关键材料,涂层的耐高温性能尤其重要。辐射性和催化性能是涂层的两个重要表面性质,对涂层的耐高温性能有重要影响。综述了刚性陶瓷隔热瓦涂层的发展以及我国的研究现状,未来的涂层应具有高辐射和低催化的表面性能,以耐受更为复杂苛刻的使用环境。

关键词：隔热瓦涂层表面性质发射率催化效率耐高温性能

沉默长链非编码RNA FAM83H-AS1提高肺腺癌细胞的化学治疗敏感性

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中国医科大学学报 2022年第3期51卷 216-220,225页

作者：郭家辰徐然中国医科大学附属盛京医院检验科沈阳110004 中国医科大学附属盛京医院胸外科沈阳110004

目的探讨长链非编码RNA FAM83H-AS1调控肺腺癌细胞化学治疗(简称化疗)敏感性(培美曲塞和顺铂)的作用效果及机制。方法实时定量PCR法检测FAM83H-AS1在肺腺癌组织和细胞系中的表达。CCK8法检测并计算肺腺癌细胞对培美曲塞和顺铂的半抑制率... 详细信息

目的探讨长链非编码RNA FAM83H-AS1调控肺腺癌细胞化学治疗(简称化疗)敏感性(培美曲塞和顺铂)的作用效果及机制。方法实时定量PCR法检测FAM83H-AS1在肺腺癌组织和细胞系中的表达。CCK8法检测并计算肺腺癌细胞对培美曲塞和顺铂的半抑制率(IC50)。基于TCGA数据库,应用生物信息学方法分析FAM83H-AS1与ATP结合盒亚家族C成员1(ABCC1)基因表达的相关性。Western boltting检测ABCC1蛋白的表达。结果与癌旁正常肺组织和人肺泡上皮细胞相比,FAM83H-AS1在肺腺癌组织和细胞系(PC9和A549)中高表达。FAM83H-AS1的表达与肺腺癌患者的吸烟史和化疗不敏感呈正相关。与化疗敏感的肺腺癌组织和细胞系(A549)相比,FAM83H-AS1在化疗(培美曲塞和顺铂)耐药的肺腺癌组织和细胞系(A549/CR)中高表达。沉默FAM83H-AS1能够降低A549/CR细胞对培美曲塞和顺铂的IC50,提高对化疗药物的敏感性。在肺腺癌中FAM83H-AS1与多药耐药相关基因ABCC1的表达呈正相关。沉默FAM83H-AS1能够降低A549/CR细胞中ABCC1蛋白的表达。结论FAM83H-AS1在肺腺癌中高表达,且与肺腺癌的化疗不敏感相关,沉默FAM83H-AS1通过下调ABCC1蛋白的表达提高肺腺癌细胞对培美曲塞和顺铂的敏感性。

关键词：肺腺癌 FAM83H-AS1 化学治疗 ATP结合盒亚家族C成员1

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基于阵列式静电传感器的颗粒带电量估计方法

仪器仪表学报 2020年第7期41卷 80-90页

作者：钟志荣左洪福郭家琛姜衡南京航空航天大学民航学院南京211106

颗粒所处空间位置对静电传感器探极表面的感应电量有重要影响,采用单传感器结构难以准确测量颗粒所带电量。采用平面阵列式传感器求解颗粒所带电量及其空间位置,以解决单传感器结构存在已知量无法满足求解条件的问题。使用COMSOL Multip... 详细信息

颗粒所处空间位置对静电传感器探极表面的感应电量有重要影响,采用单传感器结构难以准确测量颗粒所带电量。采用平面阵列式传感器求解颗粒所带电量及其空间位置,以解决单传感器结构存在已知量无法满足求解条件的问题。使用COMSOL Multiphysics建立阵列式静电传感器的高保真传感数值模型,结合静电传感器传感模型的理论和方法,通过实验验证所建模型对带电颗粒运动与静电感应过程的有效性。提出一种基于Tikhonov正则化方法的颗粒带电空间分布求解算法,实现单个颗粒所带电量及其空间位置的确定。经仿真与实验验证,颗粒反演带电量与实际带电量误差绝对值低于8%。所提方法可准确反演带电颗粒所带电量及其空间位置。

关键词：静电传感器电荷测量 COMSOL模型仿真荷电颗粒正则化