Results 11 to 20 of about 24,368 (105)

Upper-bounding bias errors in satellite navigation

, 2014
A satellite navigation system for a safety critical application is required to provide an integrity alert of any malfunction; the probability that a navigation positioning error exceeds a given alert limit without an integrity alert is required to be ...
Iwamoto, Takashi
core   +1 more source

Research on the Deformation Mechanism of Railway Subgrade under Buried Strike–Slip Fault Dislocation

Applied Sciences
With the gradual densification of China’s railway network, more and more railways are inevitably crossing active fault zones. Creep dislocation and stick–slip dislocation of the fault zones can lead to uneven deformation and cracks in the railway ...
Jingwei Liang, Yangsheng Ye, Degou Cai, Hongye Yan, Junkai Yao   +4 more
doaj   +1 more source

Study on the measurement of buckle pressure of rail elastic strip fastener based on modal method and ultrasonic method

Journal of Low Frequency Noise, Vibration and Active Control
The railway elastic strip fastener system is heavily used in the laying of seamless lines, where the buckle pressure of elastic strip fasteners is an important part of railway safety inspection.
Fan Zhang, Wentao Song, Feifan Chen
doaj   +1 more source

Dynamics of active filaments in porous media

, 2019
The motion of active polymers in a porous medium is shown to depend critically on flexibilty, activity and degree of polymerization. For given Peclet number, we observe a transition from localisation to diffusion as the stiffness of the chains is ...
Mokhtari, Zahra, Zippelius, Annette
core   +1 more source

Observational evidence for self-interacting cold dark matter [PDF]

, 2000
Cosmological models with cold dark matter composed of weakly interacting particles predict overly dense cores in the centers of galaxies and clusters and an overly large number of halos within the Local Group compared to actual observations.
A. A. de Laix, A. A. Klypin, A. Dekel, A. Kusenko, B. Moore, B. Moore, B. Moore, B.-A. Gradwohl, C. W. Stubbs, David N. Spergel, E. D. Carlson, G. Dvali, G. Dvali, G. Kauffmann, G. Quinlan, G. Starkman, G. Toth, J. A. Tyson, J. Dalcanton, J. Dalcanton, J. Dalcanton, J. F. Navarro, J. Goodman, J. J. Mohr, J. V. Kepner, L. Blitz, M. E. Machacek, M. M. MacLow, M. Mateo, M. Weinberg, M. Zwann, N. Bahcall, P. D. Sackett, Paul J. Steinhardt, R. A. C. Croft, R. A. Flores, R. Bernabei, R. Schaeffer, V. P. Debattista, W. H. Press, W. J. G. De Blok   +40 more
core   +2 more sources

Visual Localization Method for Fastener-Nut Disassembly and Assembly Robot Based on Improved Canny and HOG-SED

Applied Sciences
Visual positioning accuracy is crucial for ensuring the successful execution of nut disassembly and assembly tasks by a fastener-nut disassembly and assembly robot.
Xiangang Cao, Mengzhen Zuo, Guoyin Chen, Xudong Wu, Peng Wang, Yizhe Liu   +5 more
doaj   +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

Interaction Between Vortex‐Induced Vibrations and Base Vibrations in Piezoelectric Harvesters

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT In the present era, powering sensors using green energy is a significant challenge. One promising solution for the power supply of small sensors relies on piezoelectric energy harvesters excited by vortex‐induced vibrations (VIVs) generated by wind.
Michele Tonan, Ilaria Palomba, Alberto Pasetto, Alberto Doria   +3 more
wiley   +1 more source

New silicon photonics integration platform enabled by novel micron-scale bends

, 2013
Even though submicron silicon waveguides have been proposed for dense integration of photonic devices, to date the lightwave circuits on the market mainly rely on waveguides with micron-scale core dimensions.
Aalto, Timo, Cherchi, Matteo, Harjanne, Mikko, Kapulainen, Markku, Ylinen, Sami   +4 more
core   +1 more source

Thirty years of glyphosate‐resistant crops and weeds: Current situation and future prospects

Pest Management Science, EarlyView.
Since 1996, when the first glyphosate‐resistant crop was commercialized and the first resistant weed was reported, resistance has expanded globally. This review analyzes emergence patterns across weed species, crops, regions, resistance mechanisms, and herbicides.
Ricardo Alcántara‐de la Cruz, Yure Marin Guidi, Mariana Ramirez‐Castillo, Fernando Storniolo Adegas, Caio Antonio Carbonari, Edivaldo Domingues Velini, Rafael De Prado, Stephen O. Duke   +7 more
wiley   +1 more source