Results 71 to 80 of about 2,381,900 (199)

The development of rail-head acoustic roughness

, 2009
A model of the development of rail-head acoustic roughness on tangent track has been formulated. The model consists of a two-dimensional time domain wheel-rail interaction force calculation, with the normal force used as the input to a two-dimensional ...
Croft, Briony Elizabeth
core   +1 more source

Rail Reform Strategies: The Australian Experience [PDF]

Widely different approaches to rail reform are evident across countries and within Australia. Reforms have involved structural separation (both vertical and horizontal) and varying degrees of private sector involvement.
Helen Owens
core  

Buddy Wire–Augmented Intravascular Lithotripsy in Refractory Calcified Coronary Lesions: A Five‐Case Series

Catheterization and Cardiovascular Interventions, EarlyView.
ABSTRACT Heavily calcified coronary lesions remain a major challenge in percutaneous coronary intervention (PCI), often limiting the effectiveness of intravascular lithotripsy (IVL). We report a five‐case series in which IVL failed to achieve adequate lesion modification but was successfully augmented by the addition of one or more buddy wires.
Alfredo Marchese, Mattia Squillace, Pierluigi Demola, Giuseppe Speziale, Francesco Bedogni, Robert J. Chilton   +5 more
wiley   +1 more source

Mechanisms and Management of Acquired Aseptic Intracardiac Communications After Transcatheter Aortic Valve Implantation: Single‐Center Case Series Insights

Catheterization and Cardiovascular Interventions, EarlyView.
ABSTRACT Background Acquired aseptic intracardiac communications (AICCs) are rare but clinically relevant structural complications following transcatheter aortic valve implantation (TAVI), typically resulting from mechanical injury to the aortic annulus, interventricular septum, or adjacent structures.
Geza Fontos, Abdelkrim Ahres, Marton Vertesaljai, Tunde Pinter, Zsolt Piroth, Matyas Pal, Peter Andreka   +6 more
wiley   +1 more source

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, Stefan S. Grubinger, Andreas Schüppel, Simona Deutinger, Gernot Schwarzenberger   +4 more
wiley   +1 more source

Evaluation of ride quality and rail surface roughness from vibration analysis of in-service passenger rail cars

, 2021
Regulatory and special visual inspection of railway tracks is important to ensure the safe and secure operation of trains. Due to increased traffic volumes, operational speeds and axle loads, new technologies are emerging to collect and monitor data more
Hendry, Michael T., Roghani, Alireza, Abdulrazagh, Parisa Haji, Toma, Elton   +3 more
core  

Single Atoms Induced Electron Transfer and Spin Polarization for High‐Performance Asymmetric Supercapacitors

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, Tong Zhou, Mingpeng Chen, Yumin Zhang, Huachuan Sun, Xiaoqu Wang, Baoye Zi, Bo Li, Jin Zhang, Zhongqi Zhu, Qingju Liu   +10 more
wiley   +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, Yang Tianqi, Xu Wei, Wang Shun, Xiaoxi Ma   +4 more
wiley   +1 more source

Experimental study on burning rate and flame geometry in construction tunnel fires under high geothermal conditions

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, Maozhen Liu, Jiayi Ha, Linbo Du, Zhi Li, Yuhao Li, Chuangang Fan   +6 more
wiley   +1 more source

Motion planning and control of an installation robot for attitude adjustment of arc parts in underground shield tunneling

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, Guofei Xiang, Liang Liao, Lai Wei, Hongli Wang, Songyi Dian   +5 more
wiley   +1 more source