Results 61 to 70 of about 6,139 (291)

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

Load Characteristics of B-type Metro Vehicle Bogie Frame

Chengshi guidao jiaotong yanjiu
Objective The international standards adopted in metro vehicle design and verification in China do not fully align with the actual vehicle operating conditions, resulting in the phenomenon of fatigue cracks in some metro vehicle bogie frames before ...
WANG Yuguang, WANG Wenjing, LI Shuang, YANG Guangxue   +3 more
doaj   +1 more source

Effect of Tunnel Ventilation on Hydrogen Dispersion From Leaks in Hydrogen Fuel Cell Trucks

Energy Science &Engineering, EarlyView.
This study investigates hydrogen leakage scenarios involving hydrogen fuel cell trucks within tunnels. Using computational fluid dynamics methods, it explores the distribution characteristics of hydrogen concentrations and the efficiency of ventilation under different forced ventilation conditions. ABSTRACT The widespread adoption of hydrogen fuel cell
Limin Geng, Shiyu Shan, Zongxue Yan, Nan Gao, Dong Huang, Zhao Gao, Xinxin Cao   +6 more
wiley   +1 more source

Study on Condition Evaluation Method of Shanghai Rail Transit Vehicle Equipment

Chengshi guidao jiaotong yanjiu
[Objective] Shanghai Metro features diverse vehicle models and significant variations in equipment conditions, so it is necessary to establish a scientific and effective vehicle equipment status assessment system to ensure the safe and reliable operation
DING Yaqi
doaj   +1 more source

Research on Wheel Polygonal Wear Based on the Vehicle–Track Coupling Vibration of Metro

Wheel polygonal wear of metro deteriorates the vibration environment of the vehicle system, potentially leading to resonance-induced fatigue failure of components. This poses serious risks to operational safety and increases maintenance costs. To address
Cuijun Dong, Xinyu Peng, Qingzhou Mao, Qunsheng Wang, Yixuan Shi, Huanyun Dai   +5 more
core   +1 more source

De‐Carbonizing the Transport Sector on the University Campus: A Techno‐Economic‐Environment Assessment and Optimization of PV Fed Electric Bicycles Amid Global Fuel Crisis

Energy Science &Engineering, EarlyView.
This study develops and evaluates a solar PV‐fed electric bicycle system optimized for university campuses in Pakistan. The techno‐economic analysis demonstrates significant fuel savings, emission reductions, and sustainability benefits, promoting a cost‐effective, eco‐friendly, and renewable transportation alternative amid rising global fuel and ...
Muhammad Abdullah Khan, Syed Ali Abbas Kazmi, Qamar uddin, Muhammad Umair Iftikhar, Muhammad Waseem   +4 more
wiley   +1 more source

Traffic Flow Data Collection Methods During Wildfire Evacuation

Fire and Materials, EarlyView.
ABSTRACT With climate change and urbanisation increasing wildfire risk in the wildland–urban interface (WUI), enhancing community evacuation preparedness is crucial. This study evaluates different data collection methods for measuring traffic flows during a community wildfire evacuation drill in Roxborough Park, Colorado, in June 2024.
Ann‐Kristin Dugstad, Maxine Berthiaume, Enrico Ronchi, Noureddine Bénichou, Paul Geoerg, Steve Gwynne, Hui Xie, Kamryn Kubose‐Peutz, Amanda Kimball, Max Kinateder   +9 more
wiley   +1 more source

Research on Dynamic Performance and Wheel Damage of Metro Vehicle with Radial Bogie

机车电传动, 2019
In order to study the dynamic performance of metro vehicles, the steering principle of radial mechanism was analyzed, three dynamic models of metro vehicles were established, which were traditional, self-steering and forced-steering and according to the ...
Jincheng LI, Junjun DING, Yang YANG, Pengpeng WU, Fu LI   +4 more
doaj  

Using the unbiased grey Markov chain optimization model to forecast passenger flows through existing urban rail transit stations

Digital Transportation and Safety
To accurately forecast the passenger flows of existing stations in urban rail transit and provide a scientific basis for subway operation management departments, a passenger flow prediction model optimized by an unbiased grey Markov chain was constructed.
Fuquan Pan, Wenzheng Li, Lixia Zhang, Xiaoxia Yang, Hailiang Tang, Yongkai Xia   +5 more
doaj   +1 more source

Field Studies on the Influence of High‐Voltage Direct Transmission Underground Cables on Soils Along the SuedLink Route in Southwest Germany

Journal of Plant Nutrition and Soil Science, EarlyView.
During regular operation of the SuedLink at a load ≤75 %, the average increase in temperature in the plowing horizon is expected to be less than 1.6°C in the soils along the route in Southwest Germany. ABSTRACT Background The SuedLink was planned as a high‐voltage direct‐current underground cable route. The construction itself is a massive intervention
Joachim Ingwersen, Alexander Schade, Andreas Lehmann, Jonas Trenz, Maja Schreiber, Christoph Drefke, Harald Schramm, Christian Bidlingmaier, Simone Graeff‐Hönninger, Thilo Streck, Karl Wieland   +10 more
wiley   +1 more source