Now showing items 11-19 of 19
Local to Global Multi-Scale Multimedia Modeling of Chemical Fate and Population Exposure
(2017)
To assess environmental and human exposure to chemical emissions, two types of approaches are available: 1. intermediate- to high-resolution, substance/location-specific analyses, and 2. lower resolution, less specific ...
Evolution of Flux Transfer Events at the Magnetopause: MMS Observations and Global Hybrid-Vlasov Simulations
(2019)
Magnetic reconnection is the underlying physical process responsible for the release of energy stored in magnetic fields that powers plasma heating and acceleration. Flux transfer events (FTEs) are transient signatures of ...
Development of the Next Generation High-Sensitivity CdZnTe Imaging Gamma-Ray Spectrometer for Planetary Science Applications.
(2013)
The Probing In situ with Neutrons and Gamma-rays (PING) instrument, developed at NASA Goddard Space Flight Center (GSFC) by the neutron/gamma-ray group, is a technology used to determine the subsurface elemental composition ...
Efficient Output-Based Adaptation Mechanics for High-Order Computational Fluid Dynamics Methods
(2018)
As numerical simulations are applied to more complex and large-scale problems, solution verification becomes increasingly important in ensuring accuracy of the computed results. In addition, although improvements in ...
The Significance of Proton Beams in the Multiscale Solar Wind
(2019)
The solar wind is a multiscale, near-collisionless plasma. Three significant timescales are decades, days, and seconds. These timescales are associated with the solar cycle, Coulomb collisions, and instabilities, ...
GNSS-R Remote Sensing of the Ocean: Surface Waves and Related Phenomena
(2016)
In this thesis, we explore several fundamental issues in GNSS-R remote sensing. Global Navigation Satellite System - Reflectometry (GNSS-R) is a relatively young remote sensing technique proposed to measure geophysical ...
Separable Inverse Problems, Blind Deconvolution, and Stray Light Correction for Extreme Ultraviolet Solar Images.
(2013)
The determination of the inputs to a system given noisy output data is known as an inverse problem. When the system is a linear transformation involving unknown side parameters, the problem is called separable. A quintessential ...
Supersonic, Single-Mode and Dual-Mode Kelvin-Helmholtz Instability Experiments Driven by a Laser-Produced Shockwave
(2017)
We developed a novel experimental platform that utilizes a laser-produced shockwave to study the evolution of hydrodynamic instabilities in a steady, supersonic (compressible) flow, from precision-machined and well-characterized ...
Plume-Surface Interactions due to Spacecraft Landings and The Discovery of Water on Mars.
(2010)
Pulsed supersonic jets or rocket plumes have different surface flow physics than steady jets, in particular in tenuous atmospheres such as that of Mars where jets are collimated over large distances compared to their ...