Results 71 to 80 of about 16,408 (264)

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

Axiomatic approach to the multicriteria structural optimization

Computer Assisted Methods in Engineering and Science, 2023
The paper presents the axiomatic approach [or solving the multicriteria optimization of thin-walled structure such as vertical cylindrical reservoirs subject to pitting corrosion.
Yuriy M. Pochtman, Vladislav V. Skalozub, Dmytro V. Nagornyy   +2 more
doaj  

PARAMETRIC FREQUENCY GENERATOR ON NONCOLLINEAR MAGNETIC FIELDS

Nauka ta progres transportu, 2019
Purpose. The article is aimed to study a parametric frequency generator on noncollinear magnetic fields, which performs the functions of a stabilized power source and means of protection against the effects of powerful impulse noises in the form of ...
K. I. Yashchuk, A. Y. Zhuravlev, V. I. Shcheka   +2 more
doaj   +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

Formation of the stress-strain state of rail bars during welding with preliminary vertical bending

MATEC Web of Conferences, 2018
The article defines the parameters and working conditions for the final restoration of the integrity of the rail beams of a continuous gauge rail by electrocontact welding, as well as when welding rails with each other when they are elongated in the ...
Shramenko Volodymyr, Bielikova Nataliia, Ovchinnikov Olexandr, Onopreichuk Dmytro, Horielyshev Stanislav   +4 more
doaj   +1 more source

Seismic analysis and design of tunnels within fault ground: A review

Deep Underground Science and Engineering, EarlyView.
The research methods of seismic response of tunnels within fault ground, including field investigations, analytical solutions, physical experiments, and numerical simulations, and seismic countermeasures are discussed. The present study examines the shortcomings and limitations of the current research and design, and puts forward proposals for future ...
Xingda Wang, Yujing Jiang, Xuepeng Zhang, Yuyong Jiao, Ningbo Li, Xiao Wang, Bo Li   +6 more
wiley   +1 more source

Railway transport in Qatar

Transportation Overview - Przeglad Komunikacyjny, 2016
The article presents the railway infrastructure projects carried out currently in Qatar with special attention to the Doha Metro Project. Types of used structures, such as viaducts and tunnels with a closer look at the construction of trackbed are described in more detail.
openaire   +1 more source

PRODUCTIVITY IN RAILWAY TRANSPORT

Science and Transport Progress, 2008
The labor productivity on railway transport ofUkraine, the methods of its calculation at facilities and the factors affecting its changes are considered in the article.
Romanko, V. I., Romanko, O. V.
openaire   +2 more sources

Carbon emission assessment of tunnel infrastructures: From construction to operation

Deep Underground Science and Engineering, EarlyView.
This study develops a lifecycle carbon accounting framework for tunnel infrastructures, covering design, construction, operation, maintenance, and dismantling. Applied to a subsea tunnel case, the framework reveals the carbon emission distribution among four typical tunnel types and highlights potential carbon offset methods for low‐carbon tunnel ...
Luyuan Long, Wout Broere, Xuehui Zhang, Tian Xia, Richard de Nijs   +4 more
wiley   +1 more source

Energy evolution‐based damage quantification and failure prediction of fault zone tunnel lining concrete: A novel acoustic emission–strain energy coupling approach

Deep Underground Science and Engineering, EarlyView.
This study investigates the damage evolution and failure mechanisms of tunnel lining concrete in active fault zones through uniaxial compression tests integrated with acoustic emission (AE) monitoring. A strong linear correlation is identified between the AE cumulative absolute energy and the total strain energy, providing a reliable energy‐based ...
Shuaida Zhu, Dongming Zhang, Mingliang Zhou, Shengjun Duo, Hongwei Huang   +4 more
wiley   +1 more source