A5063640595- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Superconducting Materials and Applications
- Magnetic and Electromagnetic Effects
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Mixing
- Stellar, planetary, and galactic studies
- Water Quality Monitoring Technologies
- Particle accelerators and beam dynamics
- Space Exploration and Technology
- Spaceflight effects on biology
- Hydrological Forecasting Using AI
- Water Systems and Optimization
- Geophysical and Geoelectrical Methods
- Water resources management and optimization
- Geological and Geophysical Studies
- Groundwater flow and contamination studies
- Psychological and Educational Research Studies
- High-pressure geophysics and materials
- Career Development and Diversity
- Social and Intergroup Psychology
Johns Hopkins University Applied Physics Laboratory
2017-2025
Johns Hopkins University
2017-2025
University of Georgia
2025
University of Baltimore
2021-2025
Michigan State University
2017-2020
Stanley Black & Decker (United States)
2020
University of Toronto
2008-2017
University of California, Davis
2016
John Wiley & Sons (United States)
2014
Zero to Three
2014
Numerical simulations of the geodynamo have successfully represented many observable characteristics geomagnetic field, yielding insight into fundamental processes that generate magnetic fields in Earth's core. Because limited spatial resolution, however, diffusivities numerical dynamo models are much larger than those core, and consequently, questions remain about how realistic these are. The typical strategy used to address this issue has been continue increase resolution quasi-laminar...
Angrites are among the oldest known pristine basaltic meteorites and record earliest stages of planet formation differentiation. Our paleomagnetic analysis three angrites found that they a past magnetic field ∼10 microteslas on angrite parent body extending from 4564 to at least 4558 million years ago. Because extends beyond expected lifetime early circumstellar disk, these paleofields were probably generated internally body, possibly by an dynamo in rapidly formed metallic core.
Mars' crustal magnetic field was most likely generated by dynamo action in the planet's early history. Unexplained characteristics of include its strength, concentration southern hemisphere, and lack correlation with any surface features except for hemispheric dichotomy. We used numerical modeling to demonstrate that mechanisms proposed explain dichotomy formation can result a single-hemisphere dynamo. This produces strong fields only hemisphere. morphology why intensities are substantially...
Reanalysis of Earth rotation observations reconciles them with globally averaged sea-level change in the 20th century.
The anomalously weak observed magnetic field of Mercury is difficult to explain by appealing crustal remanent magnetism or Earth‐like dynamo mechanisms. Although the likely caused a hydromagnetic dynamo, strength far weaker than characteristic expected from an active, strong dynamo. Recent experimental work has shown that sources compositional convection exist in mixtures sulfur and iron at temperatures pressures relevant Mercury's core. number location these “snow” zones dependent on...
Abstract Seismic measurements from the NASA Mars InSight mission revealed that Mars' core has a relatively low density, implying larger fraction of lighter elements than previously thought, which further leads to melting temperature. Thus, probably never developed solid inner during its early history when dynamo was active. We perform full‐sphere simulations eliminate influence an on behaviors and investigate how various magnitudes heat flux perturbations at core‐mantle boundary affect field...
Intrinsic magnetic fields were once commonplace across our Solar System, and many planetary bodies have sustained active dynamos to the present day. The nature behavior of these vary widely, however, reflecting diverse internal conditions planets as summarized in this review. For terrestrial planets, existence and/or ancient remanent magnetization recorded crustal rocks, or lack thereof, lead questions about their timing power sources. Paleomagnetic studies reveal that small System exhibit...
Through the process of thermal ionization, intense stellar irradiation renders Hot Jupiter atmospheres electrically conductive. Simultaneously, lateral variability in drives global circulation with peak wind speeds order ~ km/s. In turn, interactions between atmospheric flows and background magnetic field give rise to Lorentz forces that can act perturb flow away from its purely hydrodynamical counterpart. Using analytical theory numerical simulations, here we show significant deviations...
Recent discoveries of water-rich, sub-Neptunian- to Neptunian-massed exoplanets with short-period orbits present a new parameter space for the study exoplanetary dynamos. We explore geometry dynamo source region within this using 1D interior structure models. model planets four chemically distinct layers that consist (1) an iron core, (2) silicate layer, (3) H2O and (4) H/He envelope. By varying total planetary mass in range 1–19 M⊕, fraction envelope between 0.1% 5.1%, equilibrium...
Giant planets that reside in close proximity to their host stars are subject extreme irradiation, which gives rise thermal ionization of trace alkali metals atmospheres. On objects where the atmospheric electrical conductivity is substantial, global circulation couples background magnetic field, inducing supplementary fields and altering nature flow. To date, a number authors have considered influence spin-pole aligned dipole field on dynamical state weakly ionized atmosphere found breaking...
Abstract Characterization of Earth's magnetic field is key to understanding dynamics the core. We assess whether Iridium Communications magnetometer data can be used for this purpose since. The 66 satellites are in 86° inclination, 780 km altitude, circular orbits, with 11 each six orbit planes. In one day constellation returns 300,000 measurements spanning globe <2° spacing. from January 2010 through November 2015, and compared against International Geomagnetic Reference Field (IGRF‐11)...
To improve drinking water quality while reducing operating costs, many utilities are investing in advanced process control and automation technologies. The use of artificial intelligence technologies, specifically neural networks, is increasing the treatment industry as they allow for development robust nonlinear models complex unit processes. This paper highlights utility networks modelling well through presentation several case studies at two large-scale plants Edmonton, Alberta.Key words:...
Mathematical models previously employed to analyze concentration profiles of dissolved ozone in bubble‐column contactors often assumed either plug flow or complete mixing. In this paper a more realistic model, the axial dispersion model (ADM), was provided integrate nonideal mixing, mass‐transfer, and ozone‐decay process as whole. The effects various parameters on were analyzed numerically. It found that group dimensionless quantities (PeL, Da, StG, StL) is most convenient describing...
Because of the complex nature drinking water treatment unit processes, utilities have difficulty quantifying interactions and relationships that exist between process inputs outputs. Process models, where they exist, are often site specific unable to simultaneously handle continuous variations in more than one or two key variables. The artificial neural network (ANN) technology is a robust intelligence can dynamic processes. As such, has been gradually gaining acceptance industry as tool for...
Magnetic field measurements demonstrate that Saturn's internally generated magnetic has an extremely small dipole tilt. The nearly‐perfect axisymmetry of is troubling because Cowling's theorem which states axisymmetric cannot be maintained by a dynamo. A possible mechanism to axisymmetrize the observed involves differential rotation in stably‐stratified electrically conducting layer surrounding Here we use numerical dynamo models study axisymmetrizing effects stably stratified layers We find...
The Facility for Rare Isotope Beams (FRIB) Project has entered the phase of beam commissioning starting from room-temperature front end and superconducting linac segment first 15 cryomodules. With newly commissioned helium refrigeration system supplying 4.5[Formula: see text]K liquid to quarter-wave resonators solenoids, FRIB accelerator team achieved sectional key performance parameters as designed ahead schedule accelerating heavy ion beams above 20[Formula: text]MeV/u energy. Thus,...
Abstract Understanding Jupiter's present‐day interior structure and dynamics is key to constraining planetary accretion models. In particular, the extent of stable stratification (i.e., non‐convective regions) in planet strongly influences long‐term cooling processes, may record primordial heavy element gradients from early a planet's formation. Because Galileo entry probe measured subsolar helium abundance, Jupiter models often invoke an outer stably stratified region due rain....