6 research outputs found
A GPU-Computing Approach to Solar Stokes Profile Inversion
We present a new computational approach to the inversion of solar
photospheric Stokes polarization profiles, under the Milne-Eddington model, for
vector magnetography. Our code, named GENESIS (GENEtic Stokes Inversion
Strategy), employs multi-threaded parallel-processing techniques to harness the
computing power of graphics processing units GPUs, along with algorithms
designed to exploit the inherent parallelism of the Stokes inversion problem.
Using a genetic algorithm (GA) engineered specifically for use with a GPU, we
produce full-disc maps of the photospheric vector magnetic field from polarized
spectral line observations recorded by the Synoptic Optical Long-term
Investigations of the Sun (SOLIS) Vector Spectromagnetograph (VSM) instrument.
We show the advantages of pairing a population-parallel genetic algorithm with
data-parallel GPU-computing techniques, and present an overview of the Stokes
inversion problem, including a description of our adaptation to the
GPU-computing paradigm. Full-disc vector magnetograms derived by this method
are shown, using SOLIS/VSM data observed on 2008 March 28 at 15:45 UT
Attitudes of pediatric nurse practitioners towards parental use of corporal punishment
Abstract not availabl
Distribution-valued weak solutions to a parabolic problem arising in financial mathematics
We study distribution-valued solutions to a parabolic problem that arises from a model of the Black-Scholes equation in option pricing. We give a minor generalization of known existence and uniqueness results for solutions in bounded domains to give existence of solutions for certain classes of distributions . We also study growth conditions for smooth solutions of certain parabolic equations on that have initial values in the space of distributions