A5062427492- Astro and Planetary Science
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Spacecraft and Cryogenic Technologies
- Methane Hydrates and Related Phenomena
- Wireless Communication Networks Research
- Power Line Communications and Noise
- Scientific Research and Discoveries
- Advanced Topology and Set Theory
- Advanced Wireless Communication Techniques
- Advanced Numerical Analysis Techniques
- Network Traffic and Congestion Control
- earthquake and tectonic studies
- Advanced Wireless Network Optimization
- Advanced Electrical Measurement Techniques
- Optical Network Technologies
- Hydrocarbon exploration and reservoir analysis
- Geophysics and Gravity Measurements
- Advanced Optical Network Technologies
- Marine and environmental studies
Johns Hopkins University Applied Physics Laboratory
2015-2024
Johns Hopkins University
2019
University of Central Oklahoma
2018
Southwest Research Institute
2016
Jackson State University
2016
Computer Algorithms for Medicine
2012-2014
Institut de Recherche Technologique SystemX
2014
Institut national de recherche en informatique et en automatique
2012
University of California, Santa Cruz
2007-2009
Planetary Science Institute
2008
The probability distribution of the phase angle between two vectors perturbed by correlated Gaussian noises is studied in detail. Definite integral expressions are derived for function, and its asymptotic behavior large signal-to-noise found "small," "near <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\pi/2</tex> ," "large" angles. results applied to obtain new formulas symbol error rate MDPSK, calculate instantaneous frequency, study digital...
Abstract The goal of NASA’s Europa Clipper mission is to assess the habitability Jupiter’s moon Europa. After entering Jupiter orbit in 2030, flight system will collect science data while flying past 49 times at typical closest approach distances 25–100 km. mission’s objectives are investigate Europa’s interior (ice shell and ocean), composition, geology; also search for characterize any current activity including possible plumes. be accomplished with a payload consisting remote sensing...
The surface of Mars appears dramatically different between the northern and southern hemispheres. Any endogenic origin for this hemispheric dichotomy must involve a pattern mantle convection that reflects shape dichotomy, primarily spherical harmonic degree‐1. We investigated two mechanisms by which degree‐1 may be initiated in Martian mantle: (1) an endothermic phase change near CMB (2) viscosity layering mid‐mantle. Using two‐dimensional (2‐D) 3‐D finite‐element models, we explored...
Abstract The primary objective of the Europa Clipper mission is to assess habitability Europa, an overarching goal that rests on improving our understanding Europa’s interior structure, composition, and geologic activity. Here we describe Gravity Radio Science (G/RS) investigation. measurement, gravitational tidal Love number $k_{2}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>k</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> , will be independent...
Although Mars currently has no global dynamo‐driven magnetic field, widespread crustal magnetization provides strong evidence that such a field existed in the past. The absence of younger large Noachian basins suggests dynamo operated early Martian history but stopped mid‐Noachian. Within 100 Ma period, 15 giant impacts occurred coincident with disappearance field. Here we investigate possible causal link between during and mid‐Noachian cessation at about same time. Using three‐dimensional...
We investigate the shape of near-Earth asteroid (101955) Bennu by constructing a high-resolution (20 cm) global digital terrain model from laser altimeter data. By modeling northern and southern hemispheres separately, we find that longitudinal ridges previously identified in north extend into south but are obscured there surface material. In south, more numerous large boulders effectively retain materials imply higher average strength at depth to support them. The has fewer evidence boulder...
Abstract Orbital observations of Mercury by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft provide new constraints on that planet's thermal interior evolution. Specifically, MESSENGER have constrained rate radiogenic heat production via measurement uranium, thorium, potassium at surface, identified a range surface compositions consistent with high‐temperature, high‐degree partial melts mantle. Additionally, data placed limits spatial temporal...
Asteroid interiors play a key role in our understanding of asteroid formation and evolution. As no direct interior probing has been done yet, characterisation asteroids' relies on interpretations external properties. Here we show, by numerical simulations, that the top-shaped rubble-pile (101955) Bennu's geophysical response to spinup is highly sensitive its material strength. This allows us infer properties provide general implications for rubble piles' structural We find low-cohesion...
Abstract The surface of the rubble‐pile asteroid (101955) Bennu has been characterized in detail by OSIRIS‐REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) mission. By examining global local digital terrain models, we observed that possesses terraces, is, a series roughly latitude‐parallel, step‐like slope breaks. These partially circumscribe poles extend east‐west over several longitudinal quadrants at mid‐ to high (≥30°) latitudes. terraces...
The MESSENGER spacecraft has imaged more than 95% of the surface Mercury. Images Caloris impact basins, along with several smaller structures, reveal evidence for volcanic plains within and exterior to basin that are younger rim might be associated long‐term aftermath Caloris's formation. broad influence on Mercury indicates it also affect heat flow mantle thereby core dynamics. Here we investigate possible links between Mercury, thermochemical evolution mantle, volcanism surrounding basins....
The long wavelength surface topography of Enceladus shows depressions about 1 km in depth and ∼10 2 wide. One possible cause this is spatially variable amounts compaction an initially porous ice shell, driven by spatial variations heat flux. Here, we show that the flux associated with convection shell can quantitatively match observed features. We develop a simple model viscous includes effect porosity on thermal conductivity, find initial at least 20–25% required to over ∼1 Ga. This...