Results 81 to 90 of about 204,995 (257)

High speed train communications systems using free space optics [PDF]

, 2010
In this work, we propose a broad-band free space optical (FSO) wireless communications system for high-speed trains. The system consists of optical transceivers positioned outside the train and along the railway track.
Ghassemlooy, Zabih, Iaz, M., Le Minh, Hoa, Paudel, Rupak, Rajbhandari, Sujan   +4 more
core  

Long unobserved and recently discovered: towards a better understanding of protected‐area species dynamics using curated species lists

Ecography, EarlyView.
Protected areas are designed to shield populations from harmful human impacts. However, in the face of global climate change, a static approach to conservation within these areas is neither feasible nor desirable. One key measure of ecological change at this scale is the arrival of new species and the local extinction of others. Despite strong interest
Thomas Mesaglio, Elizabeth Wenk, Hervé Sauquet, William K. Cornwell   +3 more
wiley   +1 more source

Evaluation of Modeling Assumptions for Predicting Structural Damage and Train Derailment Under Earthquake Loading

Earthquake Engineering &Structural Dynamics, EarlyView.
ABSTRACT The rapid development of new railway networks and the aging of existing infrastructure in seismic‐prone regions continue to motivate the need for efficient methods to simulate the dynamic behavior of coupled train track structure systems. While detailed train–structure interaction (TSI) models can capture complex mechanisms, they are often too
Miguel A. Gomez, Matthew J. DeJong
wiley   +1 more source

Research on DOA estimation algorithm for coherent signal under low signal to noise ratio

Dianzi Jishu Yingyong, 2018
In order to solve the problem of low coherent signal DOA estimation accuracy and low resolution in low signal to noise ratio, this paper proposes a DOA estimation algorithm for coherent signal under low SNR.
Ren Quanhui, Chen Xiangcheng
doaj   +1 more source

High speed short range optical wireless ground-to-train communications [PDF]

, 2010
There is a huge demand for seamless high-speed communications in fast moving trains. People want broadband services while on board as in their home or in the workplace.
Ghassemlooy, Zabih, Le Minh, Hoa, Paudel, Rupak, Rajbhandari, Sujan   +3 more
core  

Effect of Ammonium Polyphosphate/Silicate Content on the Postfire Mechanics of Epoxy Glass‐Fiber Composites Using Facile Chocolate Bar‐Inspired Structures

Fire and Materials, Volume 49, Issue 3, Page 329-346, April 2025.
ABSTRACT This study investigates the postfire mechanical properties of epoxy glass‐fiber reinforced composites (EP GFRCs) using increasing concentrations of ammonium polyphosphate (APP) and inorganic silicate (InSi) to modify the char and fire residue.
Sruthi Sunder, Maria Jauregui Rozo, Sneha Inasu, Dietmar Meinel, Bernhard Schartel, Holger Ruckdäschel   +5 more
wiley   +1 more source

Dynamic responses characteristics of bedrock and overburden layer slope with anchored frame piles based on shaking table test

Scientific Reports
To adapt to higher and steeper slope environments, this paper proposes a new type of support structure called an anchored frame pile. The study designed and conducted a series of shaking table tests with three-way loading.
Lei Wang, Qianhui Pu, Guangpeng Chen, Jing Lian, Changwei Yang, Mingming Dai   +5 more
doaj   +1 more source

Topic Modelling for Object-Based Unsupervised Classification of VHR Panchromatic Satellite Images Based on Multiscale Image Segmentation

Remote Sensing, 2017
Image segmentation is a key prerequisite for object-based classification. However, it is often difficult, or even impossible, to determine a unique optimal segmentation scale due to the fact that various geo-objects, and even an identical geo-object ...
Li Shen, Linmei Wu, Yanshuai Dai, Wenfan Qiao, Ying Wang   +4 more
doaj   +1 more source

Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen

Geological Journal, EarlyView.
By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang, Aibing Chen, Jian Yang, Yuan Zhang   +3 more
wiley   +1 more source

Control Strategy of Subway Bidirectional Converter for Suppressing Grid Background Harmonics

Chengshi guidao jiaotong yanjiu
[Objective] The nonlinear power equipment in subway traction power supply systems causes distortions in grid voltage during operation, leading to large grid background harmonics, which will affect the grid-connected current quality of subway ...
ZHOU Xiangjie, LIU Xiaogui, QIAN Na, LI Songlin, ZHANG Dachuan   +4 more
doaj   +1 more source