Results 21 to 30 of about 4,490,894 (295)
Oriented vehicles travelling in spherical space [PDF]
, 2009 This paper tackles the path planning problem for oriented vehicles travelling in the non-Euclidean 3-Dimensional space; spherical space S3 . For such problem the orientation of the vehicle is naturally represented by orthonormal frame bundle; the ...
Biggs, James, Holderbaum, William
core +3 more sources
Excitation of zero-frequency magnetic field-aligned currents by ionospheric heating [PDF]
Annales Geophysicae, 2011 Time-dependent, three-dimensional numerical simulations of the reduced MHD model describing shear Alfvén waves in the magnetosphere provide an interesting prediction superficially similar to results of several ionospheric heating experiments conducted
A. V. Streltsov +3 more
doaj +1 more source
A Comparison of Sporadic-E Occurrence Rates Using GPS Radio Occultation and Ionosonde Measurements
Remote Sensing, 2022 Sporadic-E (Es) occurrence rates from Global Position Satellite radio occultation (GPS-RO) measurements have shown to vary by a factor of five between studies, motivating the need for a comparison with ground-based measurements.
Rodney A. Carmona +3 more
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Characterization of vortex-shedding regimes and lock-in response of a wind turbine airfoil with two high-fidelity simulation approaches [PDF]
Wind Energy ScienceIn this work, the vortex-induced vibration (VIV) phenomenon affecting a wind turbine airfoil section at 90° incidence is analysed with two numerical approaches, a two-dimensional (2D) setup of the airfoil, simulated using the unsteady Reynolds-averaged ...
R. Fernandez-Aldama +6 more
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Effects of the postsunset vertical plasma drift on the generation of equatorial spread F
Progress in Earth and Planetary Science, 2018 Equatorial spread F (ESF) irregularities are caused by plasma instability processes in the equatorial ionosphere and especially related to plasma bubble phenomena in the topside F region.
Chao-Song Huang
doaj +1 more source
Statistical analysis of C/NOFS planar Langmuir probe data [PDF]
Annales Geophysicae, 2014 The planar Langmuir probe (PLP) onboard the Communication/Navigation Outage Forecasting System (C/NOFS) satellite has been monitoring ionospheric plasma densities and their irregularities with high resolution almost seamlessly since May 2008 ...
E. Costa, P. A. Roddy, J. O. Ballenthin
doaj +1 more source
A Novel Lane-Change Decision-Making With Long-Time Trajectory Prediction for Autonomous Vehicle
IEEE Access, 2023 In the process of autonomous vehicle lane changing, a reliable decision-making system is crucial for driving safety and comfort. However, traditional decision-making systems have short-term characteristics, which makes them susceptible to real-time ...
Xudong Wang +5 more
doaj +1 more source
System engineering of autonomous space vehicles [PDF]
2014 International Conference on Prognostics and Health Management, 2014 Human exploration of the solar system requires fully autonomous systems when travelling more than 5 light minutes from Earth. This autonomy is necessary to manage a large, complex spacecraft with limited crew members and skills available. The communication latency requires the vehicle to deal with events with only limited crew interaction in most cases.
Watson, Michael D. +2 more
openaire +2 more sources
Frontiers in Astronomy and Space SciencesThere is a multitude of wave-like phenomena in Earth’s ionosphere and thermosphere such as acoustic waves, gravity waves, planetary waves, tides, and Traveling Ionospheric Disturbances (TIDs) which are the ionospheric manifestation of atmospheric waves ...
Joe Hughes +8 more
doaj +1 more source
Unified OSTBC-based communication scheme for cooperative space vehicles
The Journal of Engineering, 2019 In many spatial cooperative vehicle networks, omni-directional communication is preferred due to its flexibility for networking. In the recent studies, space time code was shown to be an effective approach for improving the performance of the omni ...
Jian Geng +4 more
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