Results 81 to 90 of about 12,249 (258)
Digital documentation of railway tunnel inspection in Austria
Civil Engineering Design, Volume 7, Issue 1, Page 3-8, March 2025.Abstract Infrastructure, especially railway tunnels, require continuous inspection to ensure their safety. Furthermore, the detection of damages at an early stage can improve their service life. These tasks represent a major challenge for those involved and the tunnel down time is a disruption in operation.
Matthias J. Rebhan +4 more
wiley +1 more source
Scientific ReportsBolts are subject to complex loads and prone to loosening failure in transverse random service environments. To establish a loosening life evaluation method applicable to different types of bolts, numerous bolt clamping-force recession curves were ...
Guangwu Yang +6 more
doaj +1 more source
Signal Enhancement Technology Based on Ultrasonic Guided Wave Rail Bottom Crack Detection
Chengshi guidao jiaotong yanjiu［Objective］ During the propagation of guided waves in rails, there are problems of poor anti-interference ability and severe signal attenuation, which hinder the identification of rail bottom cracks.
HE Jiping +7 more
doaj +1 more source
California high speed rail proposal: “High speed rail and wildlife”
, 2005 The California High Speed Rail (HSR) Proposal is in the initial planning phase. In response to increasing population and an overtaxed transportation network, a 700-mile HSR proposal has been proposed to link major metropolitan areas in the state. The HSR proposed would be devised of state-of-the-art technology, travel at a maximum speed of 220 miles, a
openaire +1 more source
Carbon Energy, EarlyView.Contributed by the introduction of Cu SAs, extra electron transfer, and spin polarization to Cooh can be induced for optimizing electronic structure, contributing to fast electron conduction, enhanced capacitive reactions and accelerated ion diffusion. ABSTRACT Features of low cost and high theoretical capacity render transition metal oxides (TMOs) as ...
Qingjie Lu +10 more
wiley +1 more source
High speed rail : challenges for the high speed rail project in Norway
, 2012 This Master Thesis has focus on parts of the public transport system in Norway. The main topic in this thesis is: What variables must be calculated for the decision concerning the construction and implementation of the Norwegian High Speed Rail project, and how are the variables calculated?
openaire +1 more source
An Ultra‐Low‐Power Biopotential Acquisition Analog Front‐End Chip for Wearable Devices
International Journal of Circuit Theory and Applications, EarlyView.A 0.8‐V, 1.2‐μW biopotential AFE combines a chopper‐stabilized CCIA with dual‐time‐scale EDO management. The slow DSL preserves > 1 GΩ input impedance, whereas an event‐triggered fast‐recovery path shortens return to the linear range after abrupt electrode‐offset disturbances. ABSTRACT A 0.8‐V, 1.2‐μW biopotential analog front‐end (AFE) IC is presented
Zhang Xin +4 more
wiley +1 more source
Deep Underground Science and Engineering, EarlyView.Abstract As tunnel construction advances in lengths and depths, the construction of tunnels in high geothermal environments has become increasingly common, raising significant fire risks. In this study, a 1:20 scale model tunnel test platform was constructed to investigate the effects of a high geothermal environment on fire behavior in tunnels during ...
Xiaoxian Fei +6 more
wiley +1 more source
The impact of high-speed rail on SO2 emissions-based on spatial difference-in-differences analysis. [PDF]
Sci Rep, 2023 Yan N, Sun Y, Lin S, Wang J, Wu T.
europepmc +1 more source
Deep Underground Science and Engineering, EarlyView.Inspired by spiders, the multilegged walk‐through assembling robot for arc parts achieves high‐precision synchronous control under heavy loads through dual‐layer hydraulic pose dynamics modeling and hierarchical pressure optimization, significantly enhancing shield tunneling assembly efficiency and precision.
Quan Xiao +5 more
wiley +1 more source