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Strong Earthquake Model of North China Craton: A Case of 2023 Mw 5.5 Earthquake in Pingyuan County, Shandong Province, China

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Acta Geologica Sinica(English Edition) 2024年第S1期 39-40页

作者： LIU Guanshen LU Renqi HE Dengfa FANG Lihua ZHANG yang Institute of Geology China Earthquake Administration College of Energy Resource China University of Geosciences Institute of Geophysics China Earthquake Administration Henan Earthquake Agency

North China is one of the high-risk areas for destructive strong earthquakes in mainland China, with a history of numerous significant seismic events. On August 6, 2023, an Mw5.5 earthquake struck Pingyuan County, Dezhou City, in Shandong Province, China. This earthquake was the largest in the eastern North China Craton(NCC) since the Tangshan earthquake of 1976. Due to the absence of surface ruptures, the fault responsible for the Pingyuan Mw5.5 earthquake remains unclear. To reveal the subsurface geological structure near the earthquake epicenter, this study utilized highresolution two-dimensional seismic reflection profiles to interpret pre-ex.sting faults.

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圆弧形蜂窝夹芯板在低速冲击下的动力响应研究

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振动与冲击 2024年第5期43卷 214-222,238页

作者：余阳付涛昆明理工大学机电工程学院昆明650500

为了研究具有负泊松比特性的圆弧形蜂窝夹芯板的动力响应,基于哈密顿原理和一阶剪切变形理论推导了圆弧形蜂窝夹芯板的运动方程,同时建立两自由度的质量-弹簧模型来获得蜂窝夹芯板与冲击器之间的接触力,利用Navier法和Duhamel积分对圆... 详细信息

为了研究具有负泊松比特性的圆弧形蜂窝夹芯板的动力响应,基于哈密顿原理和一阶剪切变形理论推导了圆弧形蜂窝夹芯板的运动方程,同时建立两自由度的质量-弹簧模型来获得蜂窝夹芯板与冲击器之间的接触力,利用Navier法和Duhamel积分对圆弧形夹芯板的运动方程解析求解。在理论模型有效性验证方面,低速冲击下蜂窝夹芯板中心最大横向位移的理论模型计算结果与ABAQUS有限元仿真结果的最大相对误差为4.9%,同时求得理论模型与已发表文献计算出的接触力最大相对误差为8%,验证了理论模型的有效性。通过理论模型研究了蜂窝胞元参数变化对蜂窝夹芯板动力响应的影响,研究结果表明:随着球形冲击器的冲击速度递增,圆弧形蜂窝夹芯板中心最大横向位移也呈现出递增的规律;圆弧形蜂窝夹芯板的抗冲击特性随着蜂窝胞元半径或角度的增大而减小,当蜂窝胞元半径从5 mm增加至7 mm时,蜂窝夹芯板的抗冲击特性减少40.28%;当蜂窝胞元角度从30°增加至60°时,蜂窝夹芯板的抗冲击特性减少83.64%;蜂窝夹芯板的抗冲击特性随着蜂窝胞元壁厚的增大而增大,当蜂窝胞元壁厚从1 mm增加至3 mm时,蜂窝夹芯板的抗冲击特性提升59.51%。通过减小胞元角度和半径,增加胞元壁厚可以提升圆弧形蜂窝夹芯板的抗冲击特性。

关键词：低速冲击蜂窝夹芯板一阶剪切变形理论质量-弹簧模型 ABAQUS有限元仿真

融合双注意力机制和动态图卷积的点云语义分割

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北京航空航天大学学报 2024年第10期50卷 2984-2994页

作者：杨军张琛兰州交通大学电子与信息工程学院兰州730070 兰州交通大学测绘与地理信息学院兰州730070

针对现有基于深度学习的三维点云语义分割算法通常在提取局部特征时忽略邻域点间深层次语义信息,聚合局部邻域特征时忽略其他邻域特征中有用信息的问题,提出融合双注意力机制和动态图卷积神经网络(DGCNN)的三维点云语义分割算法。通过... 详细信息

针对现有基于深度学习的三维点云语义分割算法通常在提取局部特征时忽略邻域点间深层次语义信息,聚合局部邻域特征时忽略其他邻域特征中有用信息的问题,提出融合双注意力机制和动态图卷积神经网络(DGCNN)的三维点云语义分割算法。通过动态图卷积操作构造边缘特征,并将中心点与邻域点的相对距离输入到核点卷积操作得到增强后的边缘特征,进一步加强中心点与邻域点之间的联系;引入空间注意力模块以建立邻域点之间的依赖关系,将特征相似点相互关联,从而在局部邻域内提取到更深层次的上下文信息,丰富邻域点的几何特征;在聚合局部邻域特征时引入通道注意力模块,通过给不同通道赋予不同的权值以达到增强有用通道同时抑制无用通道的目的,从而提高语义分割的准确率。在S3DIS数据集和SemanticKITTI数据集上的实验结果表明:所提算法的语义分割精度分别达到了66.0%和59.4%,与其他经典的网络模型相比,取得了更好的点云分割效果。

关键词：三维点云语义分割深度学习注意力机制动态图卷积

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Recent Advances in Fault Diagnosis Techniques for Photovoltaic Systems:a Critical Review

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Protection and Control of Modern Power Systems 2024年第3期9卷 36-59页

作者： Bo yang Ruyi Zheng Yiming Han Jianx.ang Huang Miwei Li Hongchun Shu Shi Su Zhengx.n Guo the School of Electrical Engineering Kunming University of Science and TechnologyKunmingChina Kunming University of Science and Technology KunmingChina the School of Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming 650500China the Kunming Bureau of CSG EHV Transmission Company KunmingChina the Power Science Research Institute of Yunnan Power Grid Co. LtdKunmingChina

If a failure in the components of a photovoltaic(PV)system,such as PV module,controller,inverter,load,cable,*** undetected and uncorrected,it can seriously affect the efficiency,safety,and reliability of the entire PV power *** addition,fires can occur if specific faults,such as arc,ground,and line-to-line faults remain ***,PV system(PVS)fault diagnoses are crucial for PV power plant reliability,efficiency,and *** fault diagnosis methods and techniques for PVS components have been *** addition,with the development of PV devices,more advanced and intelligent diagnostic technologies are continuously being researched and ***,a systematic and thorough analysis,summary,and conclusion are still urgently ***,this paper introduces the types,causes,and impacts of PVS faults,and reviews and discusses the methods proposed in the literature for PVS fault diagnosis,and in particular,failures in PV *** attention is paid to the optimization direction of various fault diagnosis methods under different priorities,and their limitations,feasibility,complex.ty,and ***,challenges and suggestions are put forward for future research.

关键词： PVS monitoring system PV fault types PV diagnosis review.

稀薄气体动理论中介观尺度数值模拟的加速方法

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国防科技大学学报 2024年第2期46卷 70-78页

作者：杨伟奇国防科技大学空天科学学院湖南长沙410073

针对滑移流、早期过渡流区域采用离散速度法(discrete velocity method,DVM)求解Boltzmann方程收敛速度极慢、计算资源消耗大的难题,提出全流场耦合介观/宏观方程加速方法。在介观层面基于有限差分的DVM求解Boltzmann方程,在宏观层面基... 详细信息

针对滑移流、早期过渡流区域采用离散速度法(discrete velocity method,DVM)求解Boltzmann方程收敛速度极慢、计算资源消耗大的难题,提出全流场耦合介观/宏观方程加速方法。在介观层面基于有限差分的DVM求解Boltzmann方程,在宏观层面基于有限体积的压力耦合方程组半隐式方法求解矩方程,充分利用纳维-斯托克斯-傅里叶/R26矩方程在低克努森数下的快速收敛特性,对介观方程进行加速。基于高阶Hermite多项式重构分布函数,完成宏观方程与介观方程之间的数据传输。仿真结果表明:全流场耦合介观/宏观方程的加速方法在滑移流、早期过渡流区域具有显著加速性能,最大降低了95.28%的计算时长;但对中、大克努森数流域,加速性能大幅度下降。

关键词：稀薄气体 Boltzmann方程离散速度法 R26矩方法加速方法

Ex.erience of humanistic nursing in hemodialysis nursing for patients with diabetic kidney disease

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World Journal of Diabetes 2024年第2期15卷 186-195页

作者： x.ao-Ying Chai x.ao-Yan Bao Ying Dai x.ng-x.ng Dai Yu Zhang Yu-Ling yang Department of Nephrology The Affiliated Hospital of Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina Department of Hemodialysis The Affiliated Hospital of Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina Department of Endocrinology The Affiliated Hospital of Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina

BACKGROUND Diabetic kidney disease(DKD)is a prevalent complication of diabetes that often requires hemodialysis for *** the field of nursing,there is a growing recognition of the importance of humanistic care,which focuses on the holistic needs of patients,including their emotional,psychological,and social ***,the application of humanistic nursing in the contex. of hemodialysis for DKD patients remains relatively *** To ex.lore the ex.erience of humanistic nursing in hemodialysis nursing for DKD *** Ninety-six.DKD patients treated with hemodialysis from March 2020 to June 2022 were included in the study and divided into the control cluster(48 cases)and the study cluster(48 cases)according to different nursing methods;the control cluster was given routine nursing and the study cluster was given humanized *** variances of negative emotion mark,blood glucose,renal function,the incidence of complications,life mark and nursing satisfaction before and after nur-sing were contrasted between the two *** No significant difference in negative emotion markers between the two clusters were observed before nursing(P>0.05),and the negative emotion markers of the two clusters decreased after *** Hamilton Anx.ety Rating Scale and Hamilton Depression Rating Scale markers were lower in the study cluster than the control *** healing rate of patients in the study cluster was significantly higher than the control cluster(97.92%vs 85.42%,P0.05).However,after nursing,blood urea nitrogen and serum creatinine(SCr)levels in the study cluster were lower than those in the control cluster(P<0.05).The incidence rate of complications was significantly lower in the study group compared to the control cluster(6.25%vs 20.83%,P<0.05).There was no significant difference in the life markers between the two clusters be

关键词： Diabetic kidney disease Hemodialysis Humanistic nursing Incidence of complication Effect

等角贴敷压电分流片圆柱壳有限元建模及减振分析

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吉林大学学报（工学版） 2024年第2期54卷 365-374页

作者：孙伟杨俊东北大学机械工程与自动化学院沈阳110819 东北大学航空动力装备振动及控制教育部重点实验室沈阳110819

考虑到圆柱壳结构容易出现花瓣型振型的特点,提出了一种等角贴敷多个压电分流片来对其进行振动抑制的方法。基于ANSYS平台,实现圆柱壳与压电片结构耦合,给出了分流电路中电子元件参数输入方法以及和压电片之间的耦合过程。以等角贴敷4... 详细信息

考虑到圆柱壳结构容易出现花瓣型振型的特点,提出了一种等角贴敷多个压电分流片来对其进行振动抑制的方法。基于ANSYS平台,实现圆柱壳与压电片结构耦合,给出了分流电路中电子元件参数输入方法以及和压电片之间的耦合过程。以等角贴敷4个压电分流片圆柱壳为对象进行实例研究,证明了建模方法的合理性以及压电分流阻尼对圆柱壳的减振效果。在此基础上进行参数影响分析,可以发现:对于电阻分流电路存在一个最优电阻值可使减振效果最优;压电片贴敷在变形相对大的区域以及增大尺寸对减振有利。

关键词：机械设计及理论压电分流薄壁圆柱壳有限元建模减振分析等角度贴敷

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Initial Ex.erience of NIR-II Fluorescence Imaging-Guided Surgery in Foot and Ankle Surgery

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Engineering 2024年第9期40卷 19-27页

作者： x.aox.ao Fan Jie yang Huwei Ni Qiming x.a x.aolong Liu Tianx.ang Wu Lin Li Paras N.Prasad Chao Liu Hui Lin Jun Qian Department of General Surgery Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310016China Centre for Optical and Electromagnetic Research&International Research Center for Advanced Photonics College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China Department of Orthopedics Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310016China Institute for Lasers Photonicsand BiophotonicsDepartment of ChemistryState University of New YorkBuffaloNY 14260-3000USA Zhejiang Engineering Research Center of Cognitive Healthcare Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310016China College of Biomedical Engineering and Instrument Science Zhejiang UniversityHangzhou 310027China

Optical imaging in the second near-infrared(NIR-II;900-1880 nm)window is currently a popular research topic in the field of biomedical *** study aimed to ex.lore the application value of NIR-II fluorescence imaging in foot and ankle surgeries.A lab-established NIR-II fluorescence surgical navigation system was developed and used to navigate foot and ankle surgeries which enabled obtaining more high-spatial-frequency information and a higher signal-to-background ratio(SBR)in NIR-II fluorescence images compared to NIR-I fluorescence images;our result demonstrates that NIR-II imaging could provide higher-contrast and larger-depth images to *** types of clinical application scenarios(diabetic foot,calcaneal fracture,and lower ex.remity trauma)were included in this *** the NIR-II fluorescence imaging technique,we observed the ischemic region in the diabetic foot before morphological alterations,accurately determined the boundary of the ischemic region in the surgical incision,and fully assessed the blood supply condition of the ***-II fluorescence imaging can help surgeons precisely judge surgical margins,detect ischemic lesions early,and dynamically trace the perfusion *** believe that portable and reliable NIR-II fluorescence imaging equipment and additional functional fluorescent probes can play crucial roles in precision surgery.

关键词： Second near-infrared fluorescence imaging Foot and ankle surgery Indocyanine green Imaging-guided surgery

Coupling metal-organic frameworks and wood-based carbon for water remediation

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Nano Research 2024年第6期17卷 5661-5669页

作者： Akhter Zia Manish Neupane Aidan McGlone Rui He Ruikun x.n Yifeng Liu Qiangu Yan Jinwu Wang Ling Li Zhiyong Cai Pei Dong Yingchao yang Department of Mechanical Engineering University of MaineOronoME 04469USA Department of Mechanical and Aerospace Engineering University of MissouriColumbiaMO 65211USA Department of Mechanical Engineering George Mason UniversityFairfaxVA 22030USA Department of Civil and Environmental Engineering Rice UniversityHoustonTX 77005USA Department of Materials Science and NanoEngineering Rice UniversityHoustonTX 77005USA Forest Products Laboratory USDAMadisonWI 53726USA School of Forestry Resources University of MaineOronoME 04469USA

Fresh and clean water is highly demanded throughout the *** effectively address the need,nanomaterials enabled nanotechnology has been ex.lored as a means of more efficient,reliable,and environmentally friendly approach towards water treatment *** concern in adopting nanomaterials is how to retrieve them from water body to avoid secondary *** this work,the earth abundant and sustainable wood,e.g.,basswood,was selected and carbonized into porous carbon as host skeleton,and metal-organic frameworks(MOFs),e.g.,MOF-199 with ex.remely high surface area,were grown throughout all channels in the porous basswood *** the traditional organic pollutant,methyl orange(MO),the combination of MOFs and basswood carbon(MOFs@carbon)demonstrates a remarkable adsorption capacity,which is 243%and 454%higher than basswood carbon and MOF-199,*** an outstanding adsorption performance originates from that the positively charged carbon pulls MO molecules close to carbon surface,leading to a high MO molecule concentration,and then the concentration gradient drives the MO molecules to be stored inside MOFs,functioning like *** findings highlight the potential application of coupled MOFs and biomass carbon in addressing water remediation.

关键词： metal-organic framework(MOF)-199 basswood carbon MOFs@carbon methyl orange