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Time reversal method for guided wave inspection in pipes

DENG Fei, WU Bin, HE Cunfu

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3,   Pages 251-260 doi: 10.1007/s11465-008-0050-1

Abstract: In parallel, a circumferential locating method based on the time reversal method is described.When the time reversal signals are re-emitted, the angular profile obtained at the axial location ofthe defect can be used to determine the circumferential location of the defect.Except for a pipe with one defect, the circumferential locating method has been verified on another pipelocation.

Keywords： reversal process     beneficial     circumferential location     energy     number    

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Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield

Frontiers of Structural and Civil Engineering   Pages 901-914 doi: 10.1007/s11709-023-0915-8

Abstract: This study focuses on the mechanical characteristics and mechanism of a bolted circumferential joint

Keywords： shield tunnel     segment joint     joint structural model     failure mechanism    

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Ductile extension of 3-D external circumferential cracks in pipe structures

Wuchao YANG, Xudong QIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 294-303 doi: 10.1007/s11709-011-0115-9

Abstract: This study investigates the ductile fracture resistance of 3-D external circumferential cracks in theequivalent 2-D axi-symmetric model provides conservative estimations of the fracture resistance for 3-D circumferential

Keywords： ductile fracture     computational cell method     G-T model     J-R curve    

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On the potential of iPhone significant location data to characterize individual mobility for air pollution

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 5, doi: 10.1007/s11783-022-1542-7

Abstract:

● We evaluated the accuracy of iPhone data in capturing time-activity patterns.

Keywords： Air pollution exposure     Human mobility     iPhone     Significant Location     Smartphone data    

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Space-time evolution rules study on acoustic emission location in rock under cyclic loading

Jiang XU, Shuchun LI, Yunqi TAO, Yongdong JIANG, Xiaojun TANG,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4,   Pages 422-427 doi: 10.1007/s11709-009-0056-8

Abstract: An acoustic emission (AE) location experiment was performed on sandstone using an advanced AE test system, and the location points changed slowly.There was a modest increase of location points in every cycle.The tendency of steady development could be predicted from the AE location events.Location events changed quite rapidly and assembled and linked continuously in the core zone.

Keywords： location result     AE location     consistent     friction     elastic-plastic deformation    

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Research and application of visual location technology for solder paste printing based on machine vision

Luosi WEI, Zongxia JIAO

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 184-191 doi: 10.1007/s11465-009-0034-9

Abstract: A location system is very important for solder paste printing in the process of surface mount technologyUsing machine vision technology to complete the location mission is new and very efficient.This paper presents an integrated visual location system for solder paste printing based on machine visionprinciple of solder paste printing is introduced and then the design and implementation of the visual locationOne is accurate image location solved by the pattern-based location algorithms of PatMax.

Keywords： machine vision     visual location     solder paste printing     VisionPro    

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Network-based optimization techniques for wind farm location decisions

Jorge Ignacio CISNEROS-SALDANA, Seyedmohammadhossein HOSSEINIAN, Sergiy BUTENKO

Frontiers of Engineering Management 2018, Volume 5, Issue 4,   Pages 533-540 doi: 10.15302/J-FEM-2018025

Abstract:

This study aims to find appropriate locations for wind farms that can maximize the overall energy output while controlling the effects of wind speed variability. High wind speeds are required to obtain the maximum possible power output of a wind farm. However, balancing the wind energy supplies over time by selecting diverse locations is necessary. These issues are addressed using network-based models. Hence, actual wind speed data are utilized to demonstrate the advantages of the proposed approach.

Keywords： wind energy     wind farm location     network analysis     optimization     clique     s-plex    

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Home location inference from sparse and noisy data: models and applications

Tian-ran HU,Jie-bo LUO,Henry KAUTZ,Adam SADILEK

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5,   Pages 389-402 doi: 10.1631/FITEE.1500385

Abstract: Accurate home location is increasingly important for urban computing.We revisit this research topic and infer home location within 100 m×100 m squares at 70% accuracy forTo the best of our knowledge, this is the first time home location has been detected at such a fine granularity

Keywords： Home location     Mobility patterns     Healthcare    

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Leakage location system for oil pipeline on basis of stress wave detection

WANG Bangfeng, CHEN Renwen

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3,   Pages 307-312 doi: 10.1007/s11465-008-0047-9

Abstract: An online monitoring system was developed for rapidly determining the exact location of the holing position
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A Survey of the Observability for Single Observer Passive Location

Deng Xinpu

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 54-62

Abstract:

A basic requirement for passive state estimation using single observer is the existence of a unique tracking solution.  This leads to the question of observability. The target state is observable over the time interval if,  and only if,  it is uniquely determined by the measurements taken in that interval.  In this paper,  the state-observability problem for passive target tracking by angle measurements is analyzed using three methods: the geometrical method,  the elementary algebraic method and linear system method.  The observability for target tracking with frequency measurements is also analyzed.  Degree of observability is discussed.  And a concise review of papers on observability analysis is presented.

Keywords： passive location     TMA     observability    

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Erratum to: On the potential of iPhone significant location data to characterize individual mobility

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 9, doi: 10.1007/s11783-022-1556-1

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On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms

Soheil ZARKANDI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 34-40 doi: 10.1007/s11465-014-0290-1

Abstract: One of the mandatory steps in this analysis is the determination of the location of these poles.The exact location of the pole on its GC is obtained based on the configuration of the mechanism and

Keywords： spherical mechanisms     instantaneous poles     great circle     angular velocity    

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Research Developments and Prospects on Microseismic Source Location in Mines Review

Jiulong Cheng,Guangdong Song,Xiaoyun Sun,Laifu Wen,Fei Li

Engineering 2018, Volume 4, Issue 5,   Pages 653-660 doi: 10.1016/j.eng.2018.08.004

Abstract:

Microseismic source location is the essential factor in microseismic monitoring technology, and itslocation precision has a large impact on the performance of the technique., as may be obtained using conventional location methods that are based on arrival time., optimization of relative location method, location method without pre-measured velocity, and locationThese new and innovative location methods for microseismic source location have extensive prospects for

Keywords： Microseismic source location     Influencing factors     Time-reversal imaging     Research progress     Prospects for    

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Moving target detection in the cepstrum domain for passive coherent location (PCL) radar

Ji-chuan LI,Xiao-de LU,Hui ZHANG,Peng-cheng YANG,Yu LIU,Mao-sheng XIANG

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 9,   Pages 785-795 doi: 10.1631/FITEE.1500036

Abstract: moving target detection (CEPMTD) algorithm based on cepstrum techniques is proposed for passive coherent location

Keywords： Moving target detection     Cepstrum techniques     Cross ambiguity function (CAF)     Passive coherent location    

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Experimental Study on Relationship Between Mass Loss Rate and Smoke Transportation to the Distant Location

Feng Wenxing,Yang Lizhong,Fang Tingyong,Huang Rui,Fan Weicheng

Strategic Study of CAE 2005, Volume 7, Issue 1,   Pages 81-85

Abstract: relationship of the mass loss rate with the smoke transportation velocity and CO concentration at a distant locationa relatively long time for the peak of the toxic species concentration to transport to the distant location

Keywords： fire     mass loss rate     distant location     transportation velocity     smoke toxicity    

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Title Author Date Type Operation

Time reversal method for guided wave inspection in pipes

DENG Fei, WU Bin, HE Cunfu

Journal Article

Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield

Journal Article

Ductile extension of 3-D external circumferential cracks in pipe structures

Wuchao YANG, Xudong QIAN

Journal Article

On the potential of iPhone significant location data to characterize individual mobility for air pollution

Journal Article

Space-time evolution rules study on acoustic emission location in rock under cyclic loading

Jiang XU, Shuchun LI, Yunqi TAO, Yongdong JIANG, Xiaojun TANG,

Journal Article

Research and application of visual location technology for solder paste printing based on machine vision

Luosi WEI, Zongxia JIAO

Journal Article

Network-based optimization techniques for wind farm location decisions

Jorge Ignacio CISNEROS-SALDANA, Seyedmohammadhossein HOSSEINIAN, Sergiy BUTENKO

Journal Article

Home location inference from sparse and noisy data: models and applications

Tian-ran HU,Jie-bo LUO,Henry KAUTZ,Adam SADILEK

Journal Article

Leakage location system for oil pipeline on basis of stress wave detection

WANG Bangfeng, CHEN Renwen

Journal Article

A Survey of the Observability for Single Observer Passive Location

Deng Xinpu

Journal Article

Erratum to: On the potential of iPhone significant location data to characterize individual mobility

Journal Article

On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms

Soheil ZARKANDI

Journal Article

Research Developments and Prospects on Microseismic Source Location in Mines

Jiulong Cheng,Guangdong Song,Xiaoyun Sun,Laifu Wen,Fei Li

Journal Article

Moving target detection in the cepstrum domain for passive coherent location (PCL) radar

Ji-chuan LI,Xiao-de LU,Hui ZHANG,Peng-cheng YANG,Yu LIU,Mao-sheng XIANG

Journal Article

Experimental Study on Relationship Between Mass Loss Rate and Smoke Transportation to the Distant Location

Feng Wenxing,Yang Lizhong,Fang Tingyong,Huang Rui,Fan Weicheng

Journal Article