Results 1 to 10 of about 49 (42)

Ka-me: a Voronoi image analyzer. [PDF]

open access: yesBioinformatics, 2012
Khiripet N, Khantuwan W, Jungck JR.
europepmc   +1 more source

Using the World Wide Lightning Location Network (WWLLN) to Study Very Low Frequency Transmission in the Earth‐Ionosphere Waveguide: 2. Model Test by Patterns of Detection/Non‐Detection

open access: yesRadio Science, Volume 57, Issue 1, January 2022., 2022
Abstract This is the second half of a two‐part study. In the first part, we had used the World Wide Lightning Location Network's (WWLN) recorded signal amplitudes to test a model of Very Low Frequency signal transmission from the lightning to each sensor.
Abram R. Jacobson   +2 more
wiley   +1 more source

Observations of Gravity Wave Refraction and Its Causes and Consequences [PDF]

open access: yes, 2023
Horizontal gravity wave (GW) refraction was observed around the Andes and Drake Passage during the SouthTRAC campaign. GWs interact with the background wind through refraction and dissipation.
Alexander, Peter   +10 more
core   +3 more sources

Computational modes and grid imprinting on five quasi-uniform spherical C-grids [PDF]

open access: yes, 2011
Currently, most operational forecasting models use latitude-longitude grids, whose convergence of meridians towards the poles limits parallel scaling. Quasi-uniform grids might avoid this limitation.
Cotter, Colin J.   +2 more
core   +1 more source

Detection of explosive events by monitoring acoustically-induced geomagnetic perturbations [PDF]

open access: yes, 1999
The Black Thunder Coal Mine (BTCM) near Gillette, Wyoming was used as a test bed to determine the feasibility of detecting explosion-induced geomagnetic disturbances with ground-based induction magnetometers.
Lewis, J P   +3 more
core   +2 more sources

The Voronoi Cell in a saturated Circle Packing and an elementary proof of Thue´s theorem [PDF]

open access: yes, 2019
The famous Kepler conjecture has a less spectacular, two-dimensional equivalent: The theorem of Thue states that the densest circle packing in the Euclidean plane has a hexagonal structure.
Leppmeier, Max
core   +2 more sources

Geometric Transformation Techniques for Digital Images: A Survey [PDF]

open access: yes, 1988
This survey presents a wide collection of algorithms for the geometric transformation of digital images. Efficient image transformation algorithms are critically important to the remote sensing, medical imaging, computer vision, and computer graphics ...
Wolberg, George
core   +2 more sources

Imaging The D-region Ionosphere With Subionospheric VLF Signals [PDF]

open access: yes, 2021
Long radio waves in the very low frequency (VLF) radio band propagate great distances in the space between Earth's surface and the base of the ionosphere.
Gasdia, Forrest
core   +1 more source

Finding Wombling Boundaries in LHC Data with Voronoi and Delaunay Tessellations

open access: yes, 2020
We address the problem of finding a wombling boundary in point data generated by a general Poisson point process, a specific example of which is an LHC event sample distributed in the phase space of a final state signature, with the wombling boundary ...
Matchev, Konstantin T.   +2 more
core   +1 more source

Characterising Spatial and Temporal Ionospheric Variability with a Network of Oblique Angle-of-arrival and Doppler Ionosondes [PDF]

open access: yes, 2020
Ionospheric variability exists on a broad range of scales, and routinely impacts skywave propagation modes of high frequency radio waves, to the detriment of radar and communication systems.
Heitmann, Andrew James
core  

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