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Domain decomposition based on the spectral element method for frequency-domain computational elastodynamics

Science China Earth Sciences 2021年第3期64卷 388-403页

作者： Linlin SHI mingwei zhuang Yuanguo ZHOU Na LIU Qinghuo LIU Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology Xiamen UniversityXiamen 361005China The Fifth Electronics Research Institute of Ministry of Industry and Information Technology Guangzhou 510610China College of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA

We propose a domain decomposition method based on the spectral element method(DDM-SEM)for elastic wave computation in frequency *** combines the high accuracy of the spectral element method and the high degree of parallelism of a domain decomposition technique,which makes this method suitable for accurate and efficient simulations of large scale problems in *** the DDM-SEM,the original large-scale problem is divided into a number of well designed *** use the spectral element method independently for each subdomain,and the neighboring subdomains are connected by a frequency-domain version of Riemann transmission condition(RTC)for elastic *** the proposed method,we can employ the non-conforming meshes and different interpolation orders in different subdomains to maximize the *** separating the internal and boundary unknowns of each subdomain,an efficient and naturally parallelizable block LDU direct solver is developed to solve the final system *** experiments verify its accuracy and efficiency,and show that the proposed DDM-SEM can be a promising numerical tool for accurately and effectively solving large and multi-scale problems of elastic *** is potentially valuable for the frequency domain seismic inversion where multiple source illuminations are required.

关键词： Elastic waves Domain decomposition Spectral element method Frequency domain Numerical simulations

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Rock physics model for velocity–pressure relations and its application to shale pore pressure estimation

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Petroleum Exploration and Development 2023年第2期50卷 404-418页

作者： GUO Jingyi LI Min zhuang mingwei SUN Yuefeng Department of Geology&Geophysics Texas A&M UniversityCollege Station77843United States Southwest Geophysical Research Institute BGPCNPCChengdu 610213China Institute of Electromagnetics and Acoustics Xiamen UniversityXiamen 361005China

Acoustic wave velocity has been commonly utilized to predict subsurface geopressure using empirical *** wave velocity is, however, affected by many factors. To estimate pore pressure accurately, we here propose to use elastic rock physics models to understand and analyze quantitatively the various contributions from these different factors affecting wave velocity. We report a closed-form relationship between the frame flexibility factor(γ) in a rock physics model and differential pressure, which presents the major control of pressure on elastic properties such as bulk modulus and compressional wave velocity. For a gas-bearing shale with abundant micro-cracks and fractures, its bulk modulus is much lower at abnormally high pore pressure(high γ values) where thin cracks and flat pores are open than that at normal hydrostatic pressure(low γ values) where pores are more rounded on average. The developed relations between bulk modulus and differential pressure have been successfully applied to the Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in the Dingshan area of the Sichuan Basin to map the three-dimensional spatial distribution of pore pressure in the shale, integrating core, log and seismic data. The estimated results agree well with field measurements. Pressure coefficient is positively correlated to gas content. The relations and methods reported here could be useful for hydrocarbon exploration, production, and drilling safety in both unconventional and conventional fields.

关键词： pore pressure pressure coefficient acoustic velocity bulk modulus pore structure shale gas Upper Ordovician Wufeng Formation Lower Silurian Longmaxi Formation Sichuan Basin

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Multi-robot cooperative localization based on autonomous motion state estimation and laser data interaction

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Science China(Information Sciences) 2010年第11期53卷 2240-2250页

作者： zhuang Yan, GU mingwei, WANG Wei & YU HaiYang Research Center of Information and Control, Dalian University of Technology, Dalian 106024, China Research Center of Information and Control Dalian University of Technology Dalian China

Multi-robot cooperative localization is an important research topic in mobile robotics. This paper mainly studies the problem of cooperative localization based on environment information interaction in unknown complex environment. Considering the effiect of robot motion state on the cooperative localization, we present an algorithm for adaptive selecting periods of the cooperative localization based on autonomous motion state estimation. In order to avoid equipping an extra localization marker on the robot which is needed for direct observation between robots, and to make full use of the interactive information between robots in the same scene, a method for obtaining multi-robot observations based on MbICP algorithm is proposed, which makes multirobot cooperative localization using EKF feasible and reliable in cluttered environment. Experiment results with the Pioneer 3-DX robots and data analysis show the method’s validity and practicability.

关键词： multi-robot cooperative localization motion state estimation metric-based iterative closest point extended Kalman filter

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速度-压力岩石物理模型及其在页岩孔隙压力预测中的应用

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石油勘探与开发 2023年第2期50卷 360-372页

作者：郭静怡李敏庄明伟孙跃峰德克萨斯A&M大学地质与地球物理系大学城77843美国中国石油集团东方地球物理勘探有限责任公司西南物探研究院成都610213 厦门大学电磁声学研究院福建厦门361005

针对现有基于声波速度的经验公式进行地层压力预测时影响因素复杂的问题,应用弹性岩石物理模型来定量分析研究速度-压力关系的各种控制因素,提出孔构参数(γ)与压差之间的解析关系,并揭示压力对岩石体积模量和纵波速度等弹性性质的主控... 详细信息

针对现有基于声波速度的经验公式进行地层压力预测时影响因素复杂的问题,应用弹性岩石物理模型来定量分析研究速度-压力关系的各种控制因素,提出孔构参数(γ)与压差之间的解析关系,并揭示压力对岩石体积模量和纵波速度等弹性性质的主控作用,进而准确预测孔隙压力。含气页岩中微裂缝及断裂发育时,异常高压下(高γ值)细小裂缝及扁平孔隙张开,岩石体积模量远低于其在静水压力下(低γ值)平均孔隙结构偏圆时的状态。结合岩心、测井及地震数据,利用此岩石物理压力关系刻画四川盆地丁山地区上奥陶统五峰组—下志留统龙马溪组页岩的孔隙压力三维空间分布变化,压力系数与含气量呈正相关,该预测结果与现场实测数据吻合较好。岩石物理压力关系的分析和方法的提出对非常规和常规油气田的勘探、生产和钻井安全都具有重要借鉴价值。

关键词：孔隙压力压力系数声波速度体积模量孔隙结构页岩气上奥陶统五峰组下志留统龙马溪组四川盆地

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A functionalized activated carbon adsorbent prepared from waste amidoxime resin by modifying with H_(3)PO_(4) and ZnCl_(2) and its excellent Cr(Ⅵ)adsorption

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 585-598页

作者： Chunlin He Yun Liu mingwei Qi Zunzhang Liu Yuezhou Wei Toyohisa Fujita Guifang Wang Shaojian Ma Wenchao Yang School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China School of Nuclear Science and Technology University of South ChinaHengyang 421000China School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of New Low-carbon Green Chemical Technology Education Department of Guangxi Zhuang Autonomous RegionNanning 530004China

With the application of resins in various fields, numerous waste resins that are difficult to treat have been produced. The industrial wastewater containing Cr(Ⅵ) has severely polluted soil and groundwater environments, thereby endangering human health. Therefore, in this paper, a novel functionalized mesoporous adsorbent PPR-Z was synthesized from waste amidoxime resin for adsorbing Cr(Ⅵ). The waste amidoxime resin was first modified with H3PO4 and ZnCl_(2), and subsequently, it was carbonized through slow thermal decomposition. The static adsorption of PPR-Z conforms to the pseudo-second-order kinetic model and Langmuir isotherm, indicating that the Cr(Ⅵ) adsorption by PPR-Z is mostly chemical adsorption and exhibits single-layer adsorption. The saturated adsorption capacity of the adsorbent for Cr(Ⅵ) could reach 255.86 mg/g. The adsorbent could effectively reduce Cr(Ⅵ) to Cr(Ⅲ) and decrease the toxicity of Cr(Ⅵ) during adsorption. PPR-Z exhibited Cr(Ⅵ) selectivity in electroplating wastewater. The main mechanisms involved in the Cr(Ⅵ) adsorption are the chemical reduction of Cr(Ⅵ) into Cr(Ⅲ) and electrostatic and coordination interactions. Preparation of PPR-Z not only solves the problem of waste resin treatment but also effectively controls Cr(Ⅵ) pollution and realizes the concept of “treating waste with waste”.

关键词： waste amidoxime resin mesoporous adsorbent H_(3)PO_(4)and ZnCl_(2)processing Cr(VI)adsorption electroplating wastewater

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对称式牛顿管演示装置

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物理与工程 2013年第5期23卷 33-34,37页

作者：韩立铭庄明伟梁志强山东交通学院理学院山东济南250023 厦门大学信息科学与技术学院福建厦门361005

利用遥控电磁铁精确控制下落物体的初始条件,采用对称式牛顿管双管对比演示自由落体运动,实现了实验数据的智能化测量且屏幕即时显示测量数据.该装置可用于自由落体运动的演示,还可测量物体在空气中自由下落的加速度、所受阻力等物理量... 详细信息

利用遥控电磁铁精确控制下落物体的初始条件,采用对称式牛顿管双管对比演示自由落体运动,实现了实验数据的智能化测量且屏幕即时显示测量数据.该装置可用于自由落体运动的演示,还可测量物体在空气中自由下落的加速度、所受阻力等物理量.该装置结构简单且可拆卸,具有组装快捷,操作方便等特点.

关键词：牛顿管光电门演示装置

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面向资源架构的知识组织应用研究

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情报资料工作 2015年第1期36卷 19-24页

作者：唐明伟庄玉良南京审计学院管理科学与工程学院江苏211815 南京大学信息管理学院江苏210093 江苏省数据工程与知识服务重点实验室(南京大学) 南京210093

文章从分析HTTP协议入手,引出并阐述面向资源架构的支撑理论REST和RESTful Web服务,并就服务请求和响应、服务描述和发布及服务主体发布三个方面与SOAP Web服务进行对比分析;在此基础上,引出面向资源架构理论并对其进行概述;接着,介绍... 详细信息

文章从分析HTTP协议入手,引出并阐述面向资源架构的支撑理论REST和RESTful Web服务,并就服务请求和响应、服务描述和发布及服务主体发布三个方面与SOAP Web服务进行对比分析;在此基础上,引出面向资源架构理论并对其进行概述;接着,介绍和对比各主流RSET开发框架的特点,总结面向资源架构的实现步骤;最后,给出基于面向资源架构的知识组织总体框架,探讨知识组织的技术实现。

关键词：知识组织 REST 面向资源架构知识服务

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溪洛渡水电站谷幅变形成因与形成条件

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河海大学学报（自然科学版） 2018年第6期46卷 497-505页

作者：周志芳李鸣威庄超郭巧娜河海大学地球科学与工程学院江苏南京211100

基于溪洛渡水电站地质环境,从水库蓄水引起的区域水文地质条件变化入手分析溪洛渡水电站谷幅变形的成因、研究谷幅变形的形成条件。结果表明:溪洛渡水电站水库蓄水引起的谷幅、库盘变形与电站位于永盛向斜盆地内、坝基玄武岩层下埋藏有... 详细信息

基于溪洛渡水电站地质环境,从水库蓄水引起的区域水文地质条件变化入手分析溪洛渡水电站谷幅变形的成因、研究谷幅变形的形成条件。结果表明:溪洛渡水电站水库蓄水引起的谷幅、库盘变形与电站位于永盛向斜盆地内、坝基玄武岩层下埋藏有厚层阳新灰岩承压含水层有关,谷幅、库盘变形规律与库区区域地质、水文地质条件和水库蓄水位、水库蓄水过程等密切相关;库盘变形、谷幅变形属于一种特殊的库岸变形。

关键词：水库谷幅变形水文地质承压含水层库岸变形溪洛渡水电站

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全面精细化管理对血站批量无偿献血工作中非标量血液产生率的影响

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中国卫生产业 2024年第1期21卷 81-84页

作者：傅明玮胡松林曹婷婷吴瑛刘易娟刘丽娟中国人民解放军联勤保障部队第924医院输血医学科广西桂林541002

目的分析全面精细化管理对血站批量无偿献血工作中非标量血液产生率的影响。方法选取2021年2月—2023年2月中国人民解放军联勤保障部队第924医院输血医学科的13名工作人员为研究对象,其中2021年2月—2022年2月实施常规化管理为对照组,... 详细信息

目的分析全面精细化管理对血站批量无偿献血工作中非标量血液产生率的影响。方法选取2021年2月—2023年2月中国人民解放军联勤保障部队第924医院输血医学科的13名工作人员为研究对象,其中2021年2月—2022年2月实施常规化管理为对照组,该阶段献血总人数5469人;2022年3月—2023年2月实施全面精细化管理后为观察组,该阶段献血总人数4679人。探究全面精细化管理对血站批量无偿献血工作中非标量血液产生率的影响。结果观察组非标量血液产生率低于对照组,差异有统计学意义(χ^(2)=5.247,P<0.05);观察组血液采集时间显著短于对照组,差异有统计学意义(P<0.05);观察组满意度(92.31%)高于对照组(69.23%),差异有统计学意义(P<0.05)。结论全面精细化管理能显著降低血站批量无偿献血工作中非标量血液产生率,缩短采血时间,进一步提升血站工作人员的满意度。

关键词：全面精细化管理血站无偿献血非标量血液

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Transmission Dynamics of an Outbreak of the COVID-19 Delta Variant B.1.617.2——Guangdong Province,China,May-June 2021

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China CDC weekly 2021年第27期3卷 584-586页

作者： Meng Zhang Jianpeng Xiao Aiping Deng Yingtao Zhang Yali zhuang Ting Hu Jiansen Li Hongwei Tu Bosheng Li Yan Zhou Jun Yuan Lei Luo Zimian Liang Youzhi Huang Guoqiang Ye mingwei Cai Gongli Li Bo Yang Bin Xu Ximing Huang Yazun Cui Dongsheng Ren Yanping Zhang Min Kang Yan Li Guangdong Provincial Center for Disease Control and Prevention GuangzhouGuangdongChina Guangdong Provincial Institute of Public Health GuangzhouGuangdongChina School of Public Health Southern Medical UniversityGuangzhouGuangdongChina Guangzhou Center for Disease Control and Prevention GuangzhouGuangdongChina Foshan Center for Disease Control and Prevention GuangzhouGuangdongChina Maoming Center for Disease Control and Prevention GuangzhouGuangdongChina Zhanjiang Center for Disease Control and Prevention GuangzhouGuangdongChina Guangzhou Liwan District Center for Disease Control and Prevention GuangzhouGuangdongChina Guangzhou Panyu District Center for Disease Control and Prevention GuangzhouGuangdongChina Guangzhou Haizhu District Center for Disease Control and Prevention GuangzhouGuangdongChina Guangzhou Yuexiu District Center for Disease Control and Prevention GuangzhouGuangdongChina Foshan Nanhai District Center for Disease Control and Prevention GuangzhouGuangdongChina Maoming Dianbai District Center for Disease Control and Prevention GuangzhouGuangdongChina National Institute for Communicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina Chinese Center for Disease Control and Prevention BeijingChina

On May 21,2021,a local case of coronavirus disease 2019(COVID-19)was confirmed in a 75-year-old woman(experienced onset of symptoms on May 18)in Liwan District,Guangzhou City,Guangdong Province,*** number of infection... 详细信息

关键词： Guangdong fir break

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