Results 31 to 40 of about 9,171 (215)

Review of Catenary Icing on High‐Speed Railways: Characteristics, Impact and Countermeasures

High Voltage
The pantograph–catenary system (PCS) is the only path for electrified railway trains to acquire energy. Catenary icing during winter is a common natural phenomenon, which usually leads to the deterioration of the current quality and severely affects the ...
Zheng Li, Guizao Huang, Zhijin Zhang, Yang Liu, Guoqiang Gao, Guolin Yang, Xi Yang, Guangning Wu   +7 more
doaj   +1 more source

Integrating Image Segmentation and Deep Learning to Improve Radio Frequency Propagation Models

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper proposes a multi‐sensor approach to improve radio frequency (RF) propagation models, which play a key role in the rapidly expanding field of connected vehicle technology. Focusing on the 1‐ to 20‐GHz frequency range, which is critical for both satellite‐to‐vehicle and base station‐to‐vehicle communications, our study introduces a ...
Jonathan Israel, Xavier Boulanger, Vegard Arneson   +2 more
wiley   +1 more source

Application Status and Development Trends of DC Ice‐Melting Devices in China's Power Grid

IET Smart Energy Systems, EarlyView.
This paper summarises the development history and engineering application status of DC ice‐melting devices (DCIMD) in China, analyses the principles, advantages, disadvantages and adaptability of mainstream topologies and discusses the key problems and corresponding improvement directions.
Ming Lei, Tianlong Zhang, Zhenglin Li, Jian Wang, Tao Zhang, Peng Wang, Ruiqi Zhan   +6 more
wiley   +1 more source

Introduction of variability in pantograph-catenary dynamic simulations [PDF]

, 2013
Currently, pantograph-catenary dynamic simulations codes are mainly based on deterministic approaches. However, the contact force between catenary and pantograph depends on many key parameters that are not always quantified precisely.
BALMES, Etienne, MASSAT, Jean-Pierre, Massat, Jean Pierre, LAURENT, Christophe, VO VAN, Olivier   +4 more
core  

A New Model of Feeding Biomechanics Based on Tied‐Arch Principles

Integrative Zoology, EarlyView.
This new biomechanical model explains the major stress and strain patterns generated through the cranium during biting. The model proposes that the cranium resolves bite‐induced reaction forces through arcs of compressive stress that span the cranial structure between biting teeth and both jaw joints.
D. Rex Mitchell
wiley   +1 more source

Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction [PDF]

, 2017
Understanding the dynamic behavior of the pantograph-catenary system is crucial for design improvement, but many factors inuence the contact force, which is the main design objective.
BALMES, Etienne, MASSAT, Jean-Pierre, Olivier Vo Van, Jean-Pierre Massat, VO VAN, Olivier, Etienne Balmes   +5 more
core   +1 more source

Smart Cities, Urban Transportation and Air Quality: A Decade of Literature on Italian Largest Cities

Journal of Economic Surveys, EarlyView.
ABSTRACT Traffic congestion and its associated negative impacts on economic performance and environmental sustainability, particularly air quality, have long plagued urban centers. This article reviews the technologies and policies adopted by major Italian cities to address these issues, focusing on interventions from 2014 to 2024. Through a keyword co‐
Vittoria Iannuzzi, Matteo Migheli
wiley   +1 more source

Genetic and Environmental Influences on Dental Arch Shape During Development: A Longitudinal Twin Study

Orthodontics &Craniofacial Research, EarlyView.
ABSTRACT Objective This study aimed to determine the relative contributions of genetic and environmental factors to phenotypic variations of dental arch shape from the primary to permanent dentition stages. Materials and Methods Maxillary and mandibular digital models of 188 twin pairs (90 monozygotic and 98 dizygotic) in the primary dentition stage ...
Jamal Giri, Michelle Bockmann, Alan Brook, Angela Gurr, Lyle Palmer, Toby Hughes   +5 more
wiley   +1 more source

Research on Influence of Rigid Catenary Locator Offset on Current Collection Performance of Rail Transit Pantograph-Catenary System

Chengshi guidao jiaotong yanjiu
ObjectiveThe rigid catenary serves as a key power supply component for urban rail transit and mountain railway trains. Sliding contact current collection between the rigid catenary and pantograph is critical to the stable and safe operation of ...
Quan LIU, Like PAN, Mengru LI
doaj   +1 more source

Bridging Dimensions in STEAM Education: Linking 2D Function Art and 3D Modeling Using GeoGebra

School Science and Mathematics, EarlyView.
ABSTRACT This study examines a constructionist‐oriented STEAM learning activity in which Grade 11 students used GeoGebra 3D to model bridges. Building on prior work in function art, the project extended mathematical art‐making from two‐dimensional representations to three‐dimensional structures, emphasizing the use of functions, geometric ...
Guillermo Bautista Jr, Theodosia Prodromou, Thierry Dana‐Picard, Genaro Ardina, Zsolt Lavicza   +4 more
wiley   +1 more source