Results 61 to 70 of about 5,517 (250)

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

Multi-objective Optimization of a Rail Profile on Curves for A Mixed Passenger and Freight Railway

工程科学与技术
ObjectiveThe mixed passenger and freight railway operates EMUs, locomotives, freight trains, and ordinary passenger trains. Different wheel profiles run on the same line, which results in a complex wheel-rail matching relationship.
NA Tong, TAO Gongquan, WEN Bingguang, CHEN Yuhong, DU Xing, WEN Zefeng   +5 more
doaj  

Cause Analysis and Rectification Measures of Chongqing Rail Transit Line 1 Low-frequency Train Oscillation

Chengshi guidao jiaotong yanjiu
Objective To address the issue of low-frequency train oscillation on Chongqing Rail Transit Line 1 (hereinafter as ′Line 1′), it is necessary to analyze the causes of the oscillation and formulate appropriate rectification measures.
ZHANG Yanzhen, WANG Wenbin, ZHOU Xiao, DAI Yuanting, ZHU Bin   +4 more
doaj   +1 more source

Investigation on tunnel stability considering pipe‐roof support with transparent soil technology

Deep Underground Science and Engineering, EarlyView.
This study integrates transparent soil technology, 3D reconstruction and numerical simulation to captures the full‐field deformation of shield tunnel instability. Results demonstrate that pipe‐roof support enhances stability via the “soil‐arching barrier effect,” effectively restraining failure wedge development by extending stress transfer paths ...
Zhi Jia, Yunpeng Ji, Zhao Lu, Honghua Zhao, Limin Zhang   +4 more
wiley   +1 more source

Investigation of railway wheelset profile wear by using computer simulation

MATEC Web of Conferences, 2019
The wear of rails and wheels is important problem in rail traffic. The change of the shape of the wheel profile has not only a great influence on the dynamic properties of the vehicle (like stability, safety by passing curved tracks, etc.), but also ...
Smetanka Lukáš, Hrček Slavomír, Šťastniak Pavol   +2 more
doaj   +1 more source

High‐Performance UV Photodetectors Based on ZnO Hierarchical Nanostructures Grown on Aerosol‐Printed 3D Ag Mesh

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
First integration of ZnO nanorods with aerosol‐printed 3D Ag meshes for UV photodetector. 3D Ag/ZnO enhances light absorption and charge separation by providing a large active surface area for efficient charge generation and a strong UV response.
Elius Hossain, Jin‐Sol Lee, Md. Abu Mosa, Kye‐Si Kwon   +3 more
wiley   +1 more source

Wheel profile design based on rail profile expansion method

Chinese Journal of Mechanical Engineering, 2008
Firstly the contact geometry of UIC high-speed wheel/rail profile SI002/UIC60 and Chinese quasi-high-speed profile LMa/CHN60 is analyzed.The analysis result shows LMa/CHN60 profile has too low degree of conformity,which would have detrimental effects on wheel/rail wear and rolling contact fatigue.So,from the view point of altering the rail contact ...
openaire   +1 more source

Concept, Tests, and Optimum Design of Novel Negative Stiffness Friction Dampers for Seismic Protection of Long‐Span Bridges

Earthquake Engineering &Structural Dynamics, EarlyView.
ABSTRACT Viscous dampers (VDs) are widely used to mitigate the excessive responses of long‐span bridges. However, VDs face some intricate challenges in engineering practices, including high damping coefficient requirement, potential base shear amplification and tremendous damping force under high velocity. To address these issues, this study develops a
Ruisheng Ma, Shaodong Jiang, Kun Xu, Qiang Han, Xiuli Du, Kaiming Bi   +5 more
wiley   +1 more source

A Novel Bipolar DC Connection Strategy for Photovoltaic Power Plants With a 50% Reduction in DC Cabling Length

Energy Science &Engineering, EarlyView.
Bipolar configuration is a new topology in the direct current (DC) system of photovoltaic power plants, which is topologically analogous to the bipolar configuration utilised in High‐Voltage Direct Current power transmission systems. DC cable length and copper usage are reduced by 50% using a bipolar configuration.
Duško M. Tovilović, Željko R. Đurišić, Vladan R. Durković   +2 more
wiley   +1 more source

Multiobjective Optimization of CRH3 EMU Wheel Profile

Advances in Mechanical Engineering, 2015
The wheel-rail wear problems inherent to railway operation have become increasingly prominent and serious, as they have been proven to be the main factors which affect safety, stability of electric multiple units (EMUs), and wheel-rail maintenance cost ...
Fengtao Lin, Xiaoqing Dong, Yueming Wang, Chunshuang Ni   +3 more
doaj   +1 more source