A5030778461- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Fluid Dynamics and Turbulent Flows
- Heat Transfer and Optimization
- Engineering Education and Pedagogy
- Planetary Science and Exploration
- Computational Fluid Dynamics and Aerodynamics
- Nanofluid Flow and Heat Transfer
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
- Heat Transfer and Boiling Studies
- Experimental Learning in Engineering
- Aerospace and Aviation Technology
- Dark Matter and Cosmic Phenomena
- Advanced Battery Technologies Research
- Aerodynamics and Acoustics in Jet Flows
- Advanced Aircraft Design and Technologies
- Air Quality Monitoring and Forecasting
- Spacecraft and Cryogenic Technologies
- Fuel Cells and Related Materials
- Earthquake Detection and Analysis
- Career Development and Diversity
Howard University
2013-2025
Osaka University
2024
Oak Ridge National Laboratory
2024
University of New Hampshire
2012-2023
American Dental Education Association
2022-2023
John Wiley & Sons (United States)
2014-2022
Charles River Laboratories (Netherlands)
2022
Johns Hopkins University Applied Physics Laboratory
2020
The Aerospace Corporation
2020
Los Alamos National Laboratory
2020
The Energetic Particle Detector (EPD) Investigation is one of five particles and fields investigations on the Magnetospheric Multiscale (MMS) mission. This mission consists four satellites operating in close proximity elliptical, low-inclination orbits, focused upon fundamental physics magnetic reconnection. investigation aboard MMS spacecraft two instrument designs, EIS (Energetic Ion Spectrometer) FEEPS (Fly’s Eye Electron Proton Spectrometer). present paper describes from an engineering...
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore dynamic three-dimensional mechanisms controlling physics plasma turbulence, ubiquitous process occurring in heliosphere and plasmas throughout universe. This will be accomplished by making simultaneous measurements at nine spacecraft with separations spanning magnetohydrodynamic sub-ion spatial scales variety near-Earth plasmas. In this paper, we describe scientific background for HS...
Abstract We present initial dual spacecraft observations that for the first time both constrain spatial scale size and provide spectral properties at medium energies of electron microbursts. explore individual microburst events occurred on 2 February 2015 using simultaneous made by twin CubeSats which comprise National Science Foundation (NSF) Focused Investigations Relativistic Electron Bursts: Intensity, Range, Dynamics (FIREBIRD II). During these events, two identically instrumented...
The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) measures linear energy transfer by Galactic Rays (GCRs) and Solar Energetic Particles (SEPs) on Lunar Reconnaissance Orbiter (LRO) Mission in a circular, polar lunar orbit. GCR fluxes remain at highest levels ever observed during space age. One largest SEP events CRaTER LRO mission occurred June 7, 2011. We compare model predictions Earth‐Moon‐Mars Environment Module (EMMREM) both dose rates from GCRs SEPs this event with results...
Abstract The Sun and its solar wind are currently exhibiting extremely low densities magnetic field strengths, representing states that have never been observed during the space age. highly abnormal activity between cycles 23 24 has caused longest minimum in over 80 years continues into unusually small maximum of cycle 24. As a result remarkably weak activity, we also highest fluxes galactic cosmic rays age relatively energetic particle events. We use observations from Cosmic Ray Telescope...
FIREBIRD-II is a National Science Foundation funded CubeSat mission designed to study the scale size and energy spectrum of relativistic electron microbursts. The consists two identical 1.5 U CubeSats in low earth polar orbit, each with solid state detectors that differ only their geometric factors fields view. Having spacecraft close orbit allows microbursts be investigated through intra-spacecraft separation when are observed simultaneously on unit. Each detector returns high cadence (10 s...
Abstract This study considers the impact of electron precipitation from Earth's radiation belts on atmospheric composition using observations NASA Van Allen Probes and NSF Focused Investigations Relativistic Electron Burst Intensity, Range, Dynamics (FIREBIRD II) CubeSats. Ratios flux between (in near‐equatorial orbit in belts) FIREBIRD II polar low Earth orbit) during spacecraft conjunctions (2015–2017) allow an estimate into atmosphere. Total Radiation Belt Content, calculated RBSP‐ECT...
This study describes the development, implementation, and evaluation of an effective curriculum for students to learn computational fluid dynamics (CFD) in introductory intermediate undergraduate graduate level courses/laboratories. The is designed use at different universities with courses/laboratories, learning objectives, applications, conditions, exercise notes. common objective teach from novice expert users who are well prepared engineering practice. a CFD Educational Interface...
Focused Investigations of Relativistic Electron Burst Intensity, Range, and Dynamics (FIREBIRD), a space weather-targeted goal-directed mission supported by the U.S. National Science Foundation, will launch into high-inclination, low-Earth orbit in October 2013 as secondary payload under NASA's Educational Launch Nanosatellites program. FIREBIRD is dual CubeSat that designed to resolve spatial scale size energy dependence electron microbursts from Van Allen radiation belts. The embodies...
Key Points Radiation from low corona Prompt SEP events CME Large doses in 2 h
The advent of small, Unpiloted Aerial Systems (sUAS) for chemical sensing and atmospheric research promises to provide new opportunities make meteorological measurements in the lowest layer Earth’s atmosphere near pollution sources. This technology is used measure changes temperature relative humidity with altitude, perform in-situ air quality readings a novel approach. integration lightweight, compact sensors rotary-winged platforms faster, cheaper, safer method than using traditional...
This paper presents the development and implementation of a new practical fuzzy switching position controller for process industry control. Compatible with structure bang-bang controller, two-input five rules is proposed. The idea based on constructing control law which functionally analogous to traditional controller. Fuzzy logic are used enable an improved version conventional objective replace proposed A modified three-stage also designed implemented. tested under same conditions as that...
Abstract PREDICCS (Predictions of Radiation from Release, EMMREM, and Data Incorporating the CRaTER, COSTEP other SEP measurements, prediccs.sr.unh.edu ) is an online system designed to provide a near real‐time characterization radiation environment inner heliosphere. utilizes data various satellites in conjunction with numerical models such as Earth‐Moon‐Mars Environment Module (EMMREM) produce dose rate particle flux at Earth, Moon Mars. The Cosmic Ray Telescope for Effects (CRaTER)...
Abstract When the first CubeSats were launched nearly two decades ago, few people believed that miniature satellites would likely prove to be a useful scientific tool. Skeptics abounded. However, last decade has seen highly successful implementation of space missions make creative and innovative use fast‐advancing CubeSat small satellite technology carry out important science experiments missions. Several projects now have used obtain first‐of‐their‐kind observations findings formed basis...
Mammalian hearing relies on a cochlear hydrodynamic sensor embodied in the inner hair cell stereocilia bundle. It is presumed that acoustical stimuli induce fluid shear-driven motion between tectorial membrane and reticular lamina to deflect hypothesized ion channels are opened by molecular gates sense tension tip-links, which connect adjacent stepped rows of stereocilia. Yet almost nothing known about how bundle interact. Here we show using our microfluidics model each row their associated...
In minimum quantity lubrication (MQL), an aerosol containing a amount of the cutting fluid is delivered to tool/workpiece interface during metal operation. The by and cooling compressed air in improves process, while low consumption rate MQL provides less cleanup reduces associated cost. this paper, molybdenum disulfide (MoS2) hexagonal boron nitride (hBN) nanoparticles were added for providing third functionality MQL, which solid at interface. Both orbital drilling tribological testing...
The Trans-Iron Galactic Element Recorder for the International Space Station (TIGERISS) is designed to measure abundances of rare ultra-heavy cosmic rays (UHGCR) $_{30}$Zn and heavier planned launch ISS in 2026. TIGERISS uses planes crossed silicon strip detectors at top bottom charge (Ohmic side) trajectory (strip determination acrylic silica aerogel Cherenkov velocity determination. Following selection second NASA Astrophysics Pioneers Program call, instrument configurations are being...
The Trans-Iron Galactic Element Recorder (TIGER) family of instruments is optimized to measure the relative abundances rare, ultra-heavy galactic cosmic rays (UHGCRs) with atomic number (Z) Z ≥ 30. Observing UHGCRs places a premium on exposure that balloon-borne SuperTIGER achieved large area detector (5.6 m2) and two Antarctic flights totaling 87 days, while smaller (∼1 TIGER for International Space Station (TIGERISS) aims achieve this longer observation time from one several years. uses...
This paper discusses experiences and lessons learned from developing an interdisciplinary graduate program (IDP) during the last 10 y: The Howard University Graduate Program in Atmospheric Sciences (HUPAS). HUPAS is first advanced degree atmospheric sciences, or related fields such as meteorology earth system instituted at a historically black college university minority-serving institution (MSI). PhD sciences was implemented 1996 direct result of synergies between overlapping interests...
We expand upon the efforts of Joyce et al. (2013), who computed modulation potential at Moon using measurements from Cosmic Ray Telescope for Effects Radiation (CRaTER) instrument on Lunar Reconnaissance Orbiter (LRO) spacecraft along with data products Earth-Moon-Mars Environment Module (EMMREM).Using potential, we calculate galactic cosmic ray (GCR) dose and equivalent rates in Earth Mars atmospheres various altitudes over course LRO mission.While cannot validate these predictions by...