Results 21 to 30 of about 46,815 (257)

Riemannian simplices and triangulations [PDF]

, 2014
We study a natural intrinsic definition of geometric simplices in Riemannian manifolds of arbitrary dimension $n$, and exploit these simplices to obtain criteria for triangulating compact Riemannian manifolds.
Dyer, Ramsay, Vegter, Gert, Wintraecken, Mathijs   +2 more
core   +5 more sources

On-Line Obstacle Detection, Avoidance, and Mapping of an Outdoor Quadrotor Using EKF-Based Fuzzy Tracking Incremental Control

IEEE Access, 2019
The unknown two-dimensional obstacles, including different shapes, numbers, locations, and in the vicinity of the planning path for an outdoor quadrotor, are on-line detected by a 360-degree Li-Dar Sweep Scanse.
Chih-Lyang Hwang, Hsiu-Ming Wu, Jui-Yu Lai   +2 more
doaj   +1 more source

A Network of Portable, Low-Cost, X-Band Radars [PDF]

, 2012
Radar is a unique tool to get an overview on the weather situation, given its high spatio- temporal resolution. Over 60 years, researchers have been investigating ways for obtaining the best use of radar.
Allegretti, Marco, Bertoldo, Silvano, Gabella, Marco, Lucianaz, Claudio, Notarpietro, Riccardo, Perona, Giovanni Emilio, Prato, Andrea, Rorato, Oscar   +7 more
core   +2 more sources

On triangles with rational altitudes, angle bisectors or medians [PDF]

Bulletin of the Australian Mathematical Society, 1992
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

The arid Andean plateau waterscapes and the lithium triangle: flamingos as flagships for conservation of high-altitude wetlands under pressure from mining development

Wetlands Ecology and Management, 2022
AbstractThe high Andean arid plateau extends through Peru, Argentina, Bolivia, and Chile. Within the desert matrix, basins contain wetlands that provide essential resources for human activity, and habitat for biodiversity highly adapted to extreme temperatures, altitudes, and salinity gradients.
P. Marconi, F. Arengo, A. Clark
openaire   +1 more source

Attitude stability and altitude control of a variable-geometry Earth-orbiting solar sail [PDF]

, 2016
A variable-geometry solar sail for on-orbit altitude control is investigated. It is shown that, by adjusting the effective area of the sail at favorable times, it is possible to influence the length of the semi-major axis over an extended period of time.
Ceriotti, Matteo, Felicetti, Leonard, Harkness, Patrick   +2 more
core   +1 more source

View Selection with Geometric Uncertainty Modeling

, 2018
Estimating positions of world points from features observed in images is a key problem in 3D reconstruction, image mosaicking,simultaneous localization and mapping and structure from motion.
Isler, Volkan, Peng, Cheng
core   +1 more source

A high-resolution divergence and vorticity dataset in Beijing derived from radar wind profiler mesonet measurements [PDF]

Earth System Science Data
Low-level convergence and cyclonic circulation are one of the most important dynamic variables in governing the initiation and development of convective storms.
X. Guo, J. Guo, D. Meng, Y. Sun, Z. Zhang, Z. Zhang, H. Xu, L. Zeng, J. Chen, N. Li, T. Chen   +10 more
doaj   +1 more source

Active Image-based Modeling with a Toy Drone

, 2018
Image-based modeling techniques can now generate photo-realistic 3D models from images. But it is up to users to provide high quality images with good coverage and view overlap, which makes the data capturing process tedious and time consuming.
Huang, Rui, Tan, Ping, Vaughan, Richard, Zou, Danping   +3 more
core   +1 more source

Implementation of Real-Time Swarm Drone Formation Using Firebase and MIT App Inventor with Interpolation-Based Control in Gazebo

Journal of Applied Informatics and Computing
This paper presents the implementation of a real-time swarm drone formation control system that leverages Firebase as the communication bridge and MIT App Inventor as the user interface.
Ryan Satria Wijaya, Hendawan Soebhakti, Rifqi Amalya Fatekha, Sarah Anggraini   +3 more
doaj   +1 more source