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EXTRACTION OF NATURAL FREQUENCY FROM MEASURED LATE-TIME TRANSIENT RESPONSES WITH RATIONAL MINIMAX APPROXIMATION IN FREQUENCY DOMAIN

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EXTRACTION OF NATURAL FREQUENCY FROM MEASURED LATE-TIME TRAN...

Age-of-information-aware PI controller for load frequency control

1998 International Conference on Microwave and Millimeter Wave Technology

作者： jiao dan Xu Shanjia Wu Xianliang Dept.of Electronic Eng.& Information Sci. Univ.of Science & Technology of China Dept.of Electronic Eng.& Information Sci. Anhui University

ISBN: (纸本)0780343085

＜正＞A simple technique is presented for extracting natural frequencies from measured late-time transient *** method first applies rational mini-max approximation to the Fourier transform of the even extension of a transient response,then obtains natural frequencies directly from the zeros of the denominator polynomial of the optimum rational function. The effectiveness of the method is verified with a synthetic transient response and a measured response of a conducting *** results from the present method for the synthetic tfansient response are compared with those from constrained E-pulse technique （CET） and genetic algorithm technique（GAT）.It indicates that the present method avoids an initial guess,overcomes the tendency to get stuck in local minima and requires much less computer effort than the *** addition,unlike the GAT,it generally guarantees convergence and is insensitive to any parameter.

关键词： transient response convergence of numerical methods minimax techniques poles and zeros radar theory Fourier transforms natural frequency extraction late-time transient responses rational minimax approximation frequency domain Fourier transform denominator polynomial optimum rational function conducting sphere convergence radar target identification

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Protection and Control of Modern Power Systems 2023年第3期8卷 32-46页

作者： dan jiao Changzheng Shao Bo Hu Kaigui Xie Chengrong Lin Zhuoxuan Ju State Key Laboratory of Power Transmission Equipment and System Security Chongqing UniversityChongqing 400044China Department of Electrical and Computer Engineering George Washington UniversityDC 20052 WashingtonUSA

Open communication system in modern power systems brings concern about information staleness which may cause power system frequency *** information staleness is often characterized by communication ***,communication delay is a packet-centered metric and cannot reflect the requirement of information freshness for load frequency control(LFC).This paper introduces the age of information(AoI),which is more compre-hensive and informative than the conventional communication delay modeling *** LFC controller and com-munication are integrated into the design for LFC performance *** AoI-aware LFC model is formulated first,and considering each allowable update period of the smart sensor,different AoI-aware PI controllers are then designed according to the exponential decay *** right AoI-aware controller and update period are selected according to the degree of frequency fluctuation of the power *** studies are carried out on one-area and two-area power *** results show the superior performance of the AoI-aware controllers in comparison to the delay-dependent controllers.

关键词： Power system Load frequency control(LFC) Age of information(AoI) PI controller

Microstructure failure in ferrite-martensite dual phase steel under in-situ tensile test

维普期刊数据库评论

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维普期刊数据库

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Journal of Iron and Steel Research International 2017年第3期24卷 350-356页

作者： Rui-bin Gou Wen-jiao dan Wei-gang Zhang Min Yu Chun-yu Zhang Yin-hu Qiao Lu Ma Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China School of Mechanical Engineering Anhui Science and Technology University Bengbu 233100 Anhui China Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong University Shanghai 200240 China College of Architecture Anhui Science and Technology University Bengbu 233100 Anhui China

To investigate microstructure failure in ferrite-martensite dual phase steel,in-situ observations were performed on multiple plate DP800 specimens during uniaxial tensile tests. Microstructure evolution of the observed region was investigated in details. The experimental data showed that micro-cracks in various regions differed in the initiation time,and micro-failures mainly occurred from the locations with typical characteristics of stress concentration（ i. e. ferrite interiors,the interfaces of ferrite-martensite grains and the martensite-martensite interfaces）. Growth of micro-crack generally experienced the following stages： cracking from martensite boundaries,tiny particles in ferrite interiors,or martensite interiors,propagating in ferrite,bypassing martensite boundaries,or passing through martensite-martensite interfaces,finally ending on martensite boundaries. Martensite was one important source of micro-failure and changed the propagation of micro-cracks significantly. Microstructure deformation was inhomogeneous in the stage of plastic deformation.

关键词： Micro-fracture Dual phase steel Ferrite Martensite In-situ observation

The fluctuating environment associated with the episodic biotic crisis during the Permo/Triassic transition:Evidence from microbial biomarkers in Changxing,Zhejiang Province

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Science China Earth Sciences 2007年第7期50卷 1052-1059页

作者： HUANG XianYu jiao dan LU LiQiang XIE ShuCheng HUANG JunHua WANG YongBiao YIN HongFu WANG HongMei ZHANG KeXin LAI XuLong Key Laboratory of Biogeology and Environmental Geology Ministry of Educationand the State Key Laboratory of GPMRChina University of GeosciencesWuhan 430074China Faculty of Material Science and Chemical Engineering China University of GeosciencesWuhan 430074China School of Environmental Studies China University of GeosciencesWuhan 430074China

The environmental conditions and the biotic crisis during the Permo-Triassic (Tr/P) transition received increasing attention in the past decades. Presented herein are the molecular fossil records of cyano-bacteria and green sulfur bacteria,the base of the marine ecosystem,to highlight the episodic nature of both the environment and the biotic crisis during this critical period. At least two episodes of cyano-bacterial expansion are documented by 2-methylhopanes ranging from C28 to C32 in carbon number,indicative of the instable marine ecosystem and the fluctuant aquatic nutrients. Meanwhile,the index of 2-alkyl-1,3,4-trimethylbenzenes (biomarkers of green sulfur bacteria) and the ratio of pristane to phy-tane (Pr/Ph) witness the fluctuation of sedimentary environmental redox conditions. The above mo-lecular evidence suggests the occurrence of highly fluctuating environmental conditions during the Tr/P transition,which is consistent with,and probably the cause of,the multi-phased biotic crisis and the prolonged faunal recovery.

关键词： cyanobacteria green sulfur bacteria molecular fossil Tr/P transition environment

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国家翻译实践地方化初探

上海翻译 2022年第2期 66-71页

作者：焦丹首都师范大学北京100037

国家翻译实践是构建中国特色翻译话语体系的有机组成部分,是提升国家翻译、国家语言与国际传播能力的必要途径。目前,国内学者对国家翻译实践的创新理论研究已渐成体系,但对其体系构建中的实现路径、成效等的实践层面研究成果依然欠缺,... 详细信息

国家翻译实践是构建中国特色翻译话语体系的有机组成部分,是提升国家翻译、国家语言与国际传播能力的必要途径。目前,国内学者对国家翻译实践的创新理论研究已渐成体系,但对其体系构建中的实现路径、成效等的实践层面研究成果依然欠缺,尤其是关于地方翻译实践对国家翻译实践的"支架"耦合作用和"点面"辩证关系的个案研究有待深度探讨。本文基于国家翻译实践体系和翻译话语体系理论框架,以陕、甘、豫三地典型翻译实践为实例,剖析地方翻译实践的形态特征、特色举措与问题现状,对地方翻译实践的内容、规划等提出建议策略,以期进一步充实国家翻译实践内容体系,探索以构建中国特色翻译话语体系为目标的国家翻译实践地方化内涵、特征、意义与实现路径,夯实中国译论发展的实践基础。

关键词：国家翻译实践地方翻译实践翻译话语体系构建地方化路径国际传播

中国武术外译话语体系构建探蹊:概念、范畴、表达

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上海翻译 2021年第4期 30-35页

作者：焦丹河南工业大学河南郑州450001

中国武术外译是中国传统武术文化走出去的话语桥梁。基于目前中国武术术语外译不规范、武术文化内涵外译不通透、武术国际传播话语体系不健全、武术海外译介发行欠规划、武术国际话语地位受限以及国外对武术文化误读等问题,本文提出"构... 详细信息

中国武术外译是中国传统武术文化走出去的话语桥梁。基于目前中国武术术语外译不规范、武术文化内涵外译不通透、武术国际传播话语体系不健全、武术海外译介发行欠规划、武术国际话语地位受限以及国外对武术文化误读等问题,本文提出"构建中国武术外译话语体系"是解决这些外译话语相关问题的主线和根本路径。参考中国翻译话语体系和武术话语体系构建的理论框架,基于中国武术外译实践,创新中国武术"概念、范畴、表达"的三新外译话语实践体系,从"术语生成、体系构建、理论阐释"三个维度探索"融通中外"的武术外译话语体系构建实践路径和理论框架,旨在增强中华武术国际传播力和国家文化软实力,提升国家形象,从本土实践繁荣中国翻译话语理论体系。

关键词：中国武术外译话语体系概念范畴表达

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口译教学动态模式构建研究

外语电化教学 2016年第5期 83-89页

作者：焦丹河南工业大学

文章主要研究口译教学动态模式。该研究以中国援外培训为实例,通过实地考察、卷宗查阅、调查问卷和深度访谈法,根据统计数据分析学生在口译中出现的问题,综合我国目前口译教学现状和口译教学模式,探索性地提出口译教学动态模式。

关键词：口译教学动态模式援外培训 “一带一路”

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基于深度教学法的商务口译课程设计与实施

外语电化教学 2018年第3期 53-58,64页

作者：焦丹河南工业大学

本文基于深度教学法对商务口译课程的课堂教学进行设计与实施研究。研究发现,学生对语言教学的深度教学法嵌入商务口译课程的接受度高,学生的显性与隐性学习效果明显。这表明深度教学法对语言教学具有指导和参考价值,同时也以此辐射其... 详细信息

本文基于深度教学法对商务口译课程的课堂教学进行设计与实施研究。研究发现,学生对语言教学的深度教学法嵌入商务口译课程的接受度高,学生的显性与隐性学习效果明显。这表明深度教学法对语言教学具有指导和参考价值,同时也以此辐射其他课程教学,尝试多元课程教学方法的创新与实践以及深度教学法的本土化推广。

关键词：深度学习深度教学法商务口译课程设计与实施

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轴、横向荷载下微倾单桩地基反力法的解析解

西安建筑科技大学学报（自然科学版） 2016年第6期48卷 862-867页

作者：张磊焦丹西安建筑科技大学土木工程学院陕西西安710055 西安建筑科技大学理学院陕西西安710055

对轴、横向荷载下微倾单桩侧向变形和内力进行研究,求得地基反力系数为常数时的解析解.采用Fortran语言编制了计算程序,并通过与模型试验结果进行对比来验证解及程序的可靠性.算例分析表明,桩身最大位移和最大弯矩随桩身初始倾角的增加... 详细信息

对轴、横向荷载下微倾单桩侧向变形和内力进行研究,求得地基反力系数为常数时的解析解.采用Fortran语言编制了计算程序,并通过与模型试验结果进行对比来验证解及程序的可靠性.算例分析表明,桩身最大位移和最大弯矩随桩身初始倾角的增加而近似线性增大,且其变化速率随轴向荷载的增加而增大;桩身最大位移和最大弯矩随轴向荷载的增加而增大,且其变化速率随桩身初始倾角和轴向荷载的增加而增大.桩顶自由时桩身最大弯矩距离地面的距离随桩身初始倾角的增加而增大,且其变化速率随桩身初始倾角的增加或力矩荷载的减小而减小;桩身最大弯矩距离地面的距离随轴向荷载的增加而近似线性减小.所得解答使桩身侧向响应计算更符合工程实际.

关键词：桩基础倾角水平荷载解析解位移