Now showing items 211-220 of 269
Post-processing modeling and removal of background noise in space-based time-of-flight sensors
(2013-11-13)
This paper develops and implements a mathematical framework that enables noise modeling and removal for any sensor that relies on discretely measured events. Here, we apply this technique to data from the Fast Imaging ...
Silurian continental distributions, paleogeography, climatology, and biogeography
(Elsevier, 1977-06-08)
Continental orientations during the Silurian Period have been determined using paleoclimatic in addition to paleomagnetic data. The influence of climate on lithology is particularly marked during periods like the Silurian ...
Asymptotic Fourier Coefficients for a C ∞ Bell (Smoothed-“Top-Hat”) & the Fourier Extension Problem
(Kluwer Academic Publishers-Plenum Publishers; Springer Science+Business Media, Inc., 2005-11-17)
In constructing local Fourier bases and in solving differential equations with nonperiodic solutions through Fourier spectral algorithms, it is necessary to solve the Fourier Extension Problem. This is the task of extending ...
High spectral resolution Fabry-Perot interferometer measurements of comet Halley at H-alpha and 6300 A
(Elsevier, 1985)
A 40.6 cm Newtonian telescope has been interfaced to the Fabry-Perot interferometer at the Arecibo Observatory to make high spectral resolution measurements of Comet Halley emissions at 6562.72 A (H-alpha) and 6300.3 A ...
The complex behavior of simple machines
(Elsevier, 1990-06)
This paper interprets work on understanding the actions of Turing machines operating on an initially blank tape. While this is impossible for arbitrary machines, complete characterizations of behavior are possible if the ...
Observation of Injection and Pre-Acceleration Processes in the Slow Solar Wind
(Kluwer Academic Publishers; Springer Science+Business Media, 1999-03)
Knowledge of injection and pre-acceleration mechanisms of ions is of fundamental importance for understanding particle acceleration that takes place in various astrophysical settings. The heliosphere offers the best chance ...
Hydrodynamic instabilities in astrophysics and in laboratory high-energy–density systems
(IOP Publishing Ltd, 2005-12-01)
High-energy–density systems and astrophysical systems both involve hydrodynamic effects, including sources of pressure, shock waves, rarefactions and plasma flows. In the evolution of such systems, hydrodynamic instabilities ...
Observations of the J = 1-0 CO lines in the Mars atmosphere: Radiodetection of 13CO and monitoring of 12CO
(Elsevier, 1989-02)
Repeated millimeter-wave observations of Mars, performed in September and October 1986 and January 1987, allowed a high-resolution recording of the J = 1-0 12CO line, and the first radiodetection of 13CO. In the hypothesis ...
An analytical and numerical study of the two-dimensional Bratu equation
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1986-09)
Bratu's problem, which is the nonlinear eigenvalue equation Δu+λ exp( u )=0 with u =0 on the walls of the unit square and λ as the eigenvalue, is used to develop several themes on applications of Chebyshev pseudospectral ...
The influence of atmospheric transport on precipitation chemistry at two sites in the midwestern United States
(Elsevier, 1989)
Cluster analyses of two-dimensional mixed layer back trajectory data were used to determine what fraction of chemical variability in precipitation composition could be related to differences in atmospheric transport. ...