- document
-
Koohmishi, Mehdi (author), Kaewunruen, Sakdirat (author), Chang, L. (author), Guo, Y. (author)Railway track health monitoring and maintenance are crucial stages in railway asset management, aiming to enhance the train operation quality and service life. For this aim, various inspection means (using diverse non-destructive testing techniques) have been applied, however, these means are mostly not able to monitor whole railway track...review 2024
- document
-
Liu, Huan (author), Wang, Shilei (author), Jing, Guoqing (author), Yu, Ziye (author), Yang, Jin (author), Zhang, Yong (author), Guo, Y. (author)Vehicle-mounted ground-penetrating radar (GPR) has been used to non-destructively inspect and evaluate railway subgrade conditions. However, existing GPR data processing and interpretation methods mostly rely on time-consuming manual interpretation, and limited studies have applied machine learning methods. GPR data are complex, high...journal article 2023
- document
-
Wang, Shilei (author), Liu, Guixian (author), Jing, Guoqing (author), Feng, Qiankuan (author), Liu, Hengbai (author), Guo, Y. (author)In the past 20 years, many studies have been performed on ballast layer inspection and condition evaluation with ground penetrating radar (GPR). GPR is a non-destructive means that can reflect the ballast layer condition (fouling, moisture) by analysing the received signal variation. Even though GPR detection/inspection for ballast layers has...review 2022
- document
-
Guo, Y. (author), Wang, Shilei (author), Jing, Guoqing (author), Yang, Fei (author), Liu, Guixian (author), Qiang, Weile (author), Wang, Yan (author)Ballast layer condition should be more regularly and accurately inspected to ensure safe train operation; however, traditional inspection methods cannot sufficiently fulfil this task. This paper presents a method of ground penetrating radar (GPR) application to reflect ballast layer fouling levels under diverse field conditions (annual gross...journal article 2022
- document
-
Guo, Y. (author), Liu, Guixian (author), Jing, Guoqing (author), Qu, Jianjun (author), Wang, Shilei (author), Qiang, Weile (author)Ground penetrating radar (GPR) has been applied for ballast layer inspection for two decades, mainly for the analysis of ballast layer fouling levels. However, some issues that affect the inspection quality remain unsolved, such as issues involving the GPR equipment quality (antenna) and the correlation between the GPR indicator and fouling...journal article 2022
- document
-
Liu, Guixian (author), Peng, Zhan (author), Jing, Guoqing (author), Wang, Shilei (author), Li, Yaonan (author), Guo, Y. (author)Ground penetrating radar (GPR) is a popular technology for inspecting railway ballast layer, mainly on the ballast fouling level. However, different GPR antennas with different frequencies are suitable for different inspection emphasis and diverse railway lines (weather and sub-structure). In addition, the full-scale track model (with...journal article 2022
- document
-
Dunmire, D. (author), Lenaerts, J.T.M. (author), Banwell, Alison (author), Wever, N. (author), Shragge, J. (author), Lhermitte, S.L.M. (author), Drews, R. (author), Pattyn, F. (author), Hansen, J.S.S. (author), Willis, I.C. (author), Miller, J. (author), Keenan, E. (author)Between 1992 and 2017, the Antarctic Ice Sheet (AIS) lost ice equivalent to 7.6 ± 3.9 mm of sea level rise. AIS mass loss is mitigated by ice shelves that provide a buttress by regulating ice flow from tributary glaciers. However, ice-shelf stability is threatened by meltwater ponding, which may initiate, or reactivate preexisting, fractures,...journal article 2020
- document
-
Radulovic, Aleksandra (author), Sladic, Dubravka (author), Govedarica, Miro (author), Ristic, Aleksandar (author), Jovanovic, Dušan (author)Survey, establishment and maintenance of utility network in Serbia are defined by the Law on state survey and cadastre (2009), the Rulebook on survey and utility network cadastre (2010), the Manual for implementation and maintenance of the utility network digital database (2005) and the Law on the procedure for registration in the real estate...conference paper 2018
- document
-
Slob, E.C. (author)In one dimension, full waveform inversion is shown to be a linear problem under several conditions. I show that if the magnetic permeability can be assumed constant and electric conductivity to be zero, measuring the magnetic field at the surface or in the air suffices as input data. I present the theory using integral equations that describe...conference paper 2018
- document
-
Zhang, L. (author), Slob, E.C. (author), van der Neut, J.R. (author), Staring, M. (author), Wapenaar, C.P.A. (author)We present a one-dimensional lossless scheme to compute an image of a dissipative medium from two single-sided reflection responses. One reflection response is measured at or above the top reflector of a dissipative medium and the other reflection response is computed as if measured at or above the top reflector of a medium with negative...conference paper 2016
- document
-
Slob, E.C. (author), Wapenaar, C.P.A. (author)Recently a new theory has been developed to retrieve a wavefield generated by a source on the surface and recorded at a point in the subsurface without the need for a receiver at that subsurface location. The scheme is presented for three-dimensional wavefields. It decomposes the electromagnetic field in up- and downgoing electric fields and in...journal article 2013
- document
-
Gorriti, A.G. (author), Ranada-Shaw, A. (author), Schoolderman, A.J. (author), Rhebergen, J.B. (author), Slob, E.C. (author)In this paper, the characterization of the electromagnetic soil properties of a blind lane used in a trial for a dual-sensor mine detector is presented. Several techniques are used and are compared here; Time Domain Reflectometry, gravimetric techniques and Frequency Domain Reflection and Transmission methods. The derived soil properties are...conference paper 2006