Results 201 to 210 of about 129,371 (270)

Toward Automated Field Ballast Condition Evaluation: Algorithm Development Using a Vision Transformer Framework

Transportation Research Record, 2023
Ballast degradation in the track substructure may cause poor drainage, settlement, and reduced lateral stability that may affect safety, daily operations, and long-term maintenance of a railroad system.
Jiayi Luo, Haohang Huang, K. Ding, I. Qamhia, E. Tutumluer, J. Hart, Hugh B. Thompson, Theodore R. Sussmann   +7 more
semanticscholar   +1 more source

Recent progress and challenges facing ballast water treatment - A review.

Chemosphere, 2021
The transoceanic movement of non-indigenous microorganisms and organic and inorganic contaminants through the transfer of ballast water of ocean-going vessels can be considered highly likely.
Burcu Sayinli, Yujiao Dong, Yuri Park, A. Bhatnagar, M. Sillanpää   +4 more
semanticscholar   +1 more source

An overview on the treatment of ballast water in ships

, 2021
Introduction of invasive species through ballast water discharge has been a serious concern with the marine ecosystem. With growing research in the ballast water management, recent studies are being focused on the types of invasive species and physico ...
E. Lakshmi, M. Priya, V. S. Achari
semanticscholar   +1 more source

First evaluation of ballast water management systems on operational ships for minimizing introductions of nonindigenous zooplankton

Marine Pollution Bulletin, 2022
Ballast water is a leading pathway for the global introduction of aquatic nonindigenous species. Most international ships are expected to install ballast water management systems (BWMS) by 2024 to treat ballast water before release.
S. Bailey, Torben Brydges, O. Casas-Monroy, Jocelyn Kydd, R. D. Linley, R. Rozon, J. Darling   +6 more
semanticscholar   +1 more source

Deciphering the characterization, ecological function and assembly processes of bacterial communities in ship ballast water and sediments.

Science of the Total Environment, 2021
Various microorganisms are transported worldwide via the water and sediments inside ship ballast tanks. Nevertheless, the ecological functions and assembly processes of bacterial communities in ballast water and sediments remain poorly understood.
Baoyi Lv, Jianhong Shi, Tao Li, Lili Ren, Wen Tian, Xiaolan Lu, Yangchun Han, Yuxue Cui, Ting Jiang   +8 more
semanticscholar   +1 more source

Geomechanical assessment of an inert steel slag aggregate as an alternative ballast material for heavy haul rail tracks

, 2021
The geomechanical behaviour of railway ballast is a key aspect in the performance of ballasted tracks, mainly under increased axle loads and/or train speeds.
B. Delgado, A. Fonseca, E. Fortunato, A. Paixão, R. Alves   +4 more
semanticscholar   +1 more source

Microplastics in ballast water as an emerging source and vector for harmful chemicals, antibiotics, metals, bacterial pathogens and HAB species: A potential risk to the marine environment and human health.

Marine Pollution Bulletin, 2019
Microplastic pollution in marine waters around the globe is increasing exponentially. This is the first comprehensive review which focuses on microplastics as a source and vector for metals, antibiotics, toxic chemicals, pathogenic bacteria (Vibrio ...
R. Naik, M. Naik, P. M. D’Costa, Fauzia Shaikh   +3 more
semanticscholar   +1 more source

Study of the characteristics of ballast bed resistance for different temperature and humidity conditions

, 2021
A ballasted track structure is one of the most representative types of railway construction. Due to the influences of low-temperature rain and snow environments in alpine regions, an in-depth study of the resistance characteristics and evolution patterns
Jianxin Liu, Ping Wang, Gan-zhong Liu, Jia-cheng Dai, Jie-ling Xiao, Hao Liu   +5 more
semanticscholar   +1 more source

A Bayesian methodology for detection of railway ballast damage using the modified Ludwik nonlinear model

Engineering structures, 2021
In this paper, an improved nonlinear model of railway ballast is proposed based on the modified Ludwik model. The accuracy of model-based structural damage detection relies on the correct representation of the mechanical behavior of the system, hence the
M. Adeagbo, H. Lam, Yiqing Ni
semanticscholar   +1 more source

Research on dynamic mechanical behavior of ballast bed in windblown sand railway based on dimensional analysis

Construction and Building Materials, 2021
Railway operation is faced with windblown sand hazards in desert areas. In order to study the influence of sand intrusion on dynamic mechanical behavior of railway ballast bed, a multi-scale discrete element model of sleeper-ballast bed-surface layer of ...
Zhihai Zhang, Hong Xiao, Meng Wang, Zhang Moyan, Jiaqi Wang   +4 more
semanticscholar   +1 more source