Editorial Material
Geography
Kendra Strauss
Summary: The call for papers for the 2022 Special Issue of the Annals of the American Association of Geographers focuses on various forms and meanings of displacements and their geographies. The articles in this issue examine how geographers conceptualize and theorize displacements, as well as the political stakes involved in researching displacements.
ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS
(2022)
Article
Chemistry, Multidisciplinary
Yinshan Li, Xinye Li, Chen Xie, Shuhao Huo
Summary: This study utilizes an improved homotopy analysis method to derive explicit solutions for the vertical and horizontal displacements of a cantilever beam under point load. The results show favorable agreements with exact solutions and indicate an increased convergence range when using the improved method. The findings have practical significance for the engineering design of slender structures.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Multidisciplinary
Qi Chen, Hajar Razi, Christian M. Schleputz, Changhua Fang, Xinxin Ma, Benhua Fei, Ingo Burgert
Summary: The study focused on the bending deformability of bamboo slivers, revealing that the characteristics of individual cells and tissue composition have a significant impact on the bending deformability.
BIOINSPIRATION & BIOMIMETICS
(2021)
Article
Chemistry, Multidisciplinary
Taesik Kim, Ho Choi, Jinman Jung, Hong Min, Young-Hoon Jung
Summary: The terrestrial photogrammetry technique is an efficient and accurate solution for evaluating ground deformations caused by construction activities. This study introduces a method using terrestrial photogrammetry to detect paving block displacements adjacent to deep excavation sites. An experimental program was conducted to investigate the displacement detections and measurements, and the proposed method successfully overcame the measurement blind spot of limited settlement points.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Analytical
Zeyu Yue, Haili Sun, Ruofei Zhong, Liming Du
Summary: The study proposes a method for calculating shield tunnel displacements, utilizing point cloud data from a mobile tunnel deformation detection system to generate orthophoto images. By combining gray gradients, the Canny algorithm, and the Hough line detection algorithm, longitudinal and transverse seams are identified, and circumferential and radial displacements are calculated through the symmetrical vertical foot method and cross-section superposition analysis. The proposed method achieves automatic recognition and fast, accurate tunnel displacement monitoring.
Article
Geochemistry & Geophysics
Taoyong Jin, Mao Zhou, Huan Zhang, Jiancheng Li, Weiping Jiang, Shengjun Zhang, Minzhang Hu
Summary: This study investigates the accuracy of the vertical deflection in the South China Sea and part of the Indian Ocean using Surface Water and Ocean Topography (SWOT) wide-swath altimeter data. The results show that the vertical deflection determined by SWOT data is better than other data sources and can significantly improve the accuracy of the east vertical deflection.
JOURNAL OF GEODESY
(2022)
Article
Environmental Sciences
Shamsa Kanwal, Xiaoli Ding, Songbo Wu, Muhammad Sajjad
Summary: This study used remote sensing and data analysis techniques to investigate vertical ground displacements and coastline erosion in Karachi, Pakistan. The results showed that some areas of the Karachi coastline are subsiding at rates comparable to or higher than the relative sea-level rise, which may accelerate coastal erosion. The causes of ground displacements and coastline erosion were identified as rapid urbanization, construction on reclaimed land, coastline erosion favoring seawater intrusion, failed drainage/sewerage networks, and soil liquefaction.
Article
Chemistry, Analytical
Michael Bekele Maru, Donghwan Lee, Kassahun Demissie Tola, Seunghee Park
Summary: This study compared the performance of optical sensors (depth camera and terrestrial laser scanner) in estimating structural deflection. Bilateral filtering techniques were used to enhance the accuracy of point cloud data and increase the prospects of sensor application in structural health monitoring. Results showed that data obtained from TLS were better than those obtained from DC.
Article
Engineering, Multidisciplinary
Jaebeom Lee, Seunghoo Jeong, Junhwa Lee, Sung-Han Sim, Kyoung-Chan Lee, Young-Joo Lee
Summary: This study proposes a new Bayesian method for directly monitoring the time-history deflections induced by high-speed trains on railway bridges. By training a monitoring model and deriving probability-based dynamic thresholds, abnormal deflection data can be detected and warnings generated.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Engineering, Geological
Liqiang Cao, Xiangsheng Chen, Xing-Tao Lin, Dong Su, Huangcheng Fang, Dechun Lu
Summary: This paper presents a simplified elastic continuum method for calculating the restraint effect of isolation piles on tunneling-induced vertical ground displacement. The proposed method considers both the relative sliding of the pile-soil interface and the pile rows-soil interaction. The results reveal the restraining mechanism of the isolation piles on vertical ground displacements due to tunneling and indicate that the stiffness of the pile-soil interface describes the strength of the pile-soil interaction.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Geography
Mabel Denzin Gergan, Tyler McCreary
Summary: The research highlights the impact of colonial legal regimes on Indigenous territories, leading to a dislocation of Indigenous time and space. Despite Indigenous peoples' efforts to challenge large-scale infrastructure projects, the colonial legal system normalizes the colonial effects on their space-time with state and capitalist development.
ANNALS OF THE AMERICAN ASSOCIATION OF GEOGRAPHERS
(2022)
Article
Engineering, Aerospace
Sermet Ogutcu, Salih Alcay, Huseyin Duman, Behlul Numan Ozdemir, Ceren Konukseven
Summary: This study investigates the performance of static and kinematic PPP-AR using a low-cost u-blox ZED-F9P GNSS receiver in displacement monitoring, compared with a geodetic-grade GNSS receiver. The capability to determine the horizontal displacement direction is also investigated. The results show the differences in RMSEs between the two receivers and demonstrate the visual detection of dynamic displacements.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Bo Yuan, Zhangyan Zhao, Yinquan Yuan
Summary: In this study, an integrated monitoring system, consisting of industrial cameras and fiber Bragg grating sensors, was tested on a cantilever rectangular thin plate made of glass fiber reinforced plastic. The deflection and strain curves of the plate were obtained through finite element simulations and experiments, and compared between different measurement methods.
IEEE SENSORS JOURNAL
(2023)
Article
Geochemistry & Geophysics
Yuanjin Pan, William C. Hammond, Hao Ding, Rishav Mallick, Weiping Jiang, Xinyu Xu, C. K. Shum, Wenbin Shen
Summary: This study rigorously estimates the vertical crustal velocities in mainland China using GPS, GRACE, and GRACE Follow-On data, revealing long-term spatial patterns of vertical tectonic motion in different blocks. The results show significant steep velocity gradients at active block boundaries.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Chemistry, Multidisciplinary
Xi Chu, Zhixiang Zhou, Weizhu Zhu, Xin Duan
Summary: Bridge displacement is important for safety evaluations. A multi-point displacement synchronous monitoring method using natural texture features of the structural surface as measurement points is proposed. The method eliminates displacement mismatches by using the structural deflection curve and achieves a maximum error of 8.70% compared to 3D laser scanning measurement method.
APPLIED SCIENCES-BASEL
(2023)