A5042840965- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Neuroscience and Neuropharmacology Research
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Neural dynamics and brain function
- Research in Cotton Cultivation
- Medical Imaging Techniques and Applications
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Cancer, Hypoxia, and Metabolism
- Astrophysics and Star Formation Studies
- Scientific Computing and Data Management
- Geology and Paleoclimatology Research
- Advanced Chemical Sensor Technologies
- Memory and Neural Mechanisms
- Radiopharmaceutical Chemistry and Applications
- Cardiac Imaging and Diagnostics
Johns Hopkins University Applied Physics Laboratory
2013-2024
Vanderbilt University Medical Center
2024
Johns Hopkins University
2010-2014
Academy of Athens
2007
Southwest Research Institute
2007
Laboratory for Atmospheric and Space Physics
2007
University of Colorado Boulder
2007
Syracuse University
2000
Clemson University
1991-1994
Fermi National Accelerator Laboratory
1988
The Jupiter Energetic Particle Detector Instruments (JEDI) on the Juno polar-orbiting, atmosphere-skimming, mission to will coordinate with several other space physics instruments spacecraft characterize and understand environment of Jupiter’s polar regions, specifically generation powerful aurora. JEDI comprises 3 nearly-identical measures at minimum energy, angle, ion composition distributions ions energies from H:20 keV O: 50 >1 MeV, energy angle distribution electrons <40 >500 keV. Each...
The Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) on the two Van Allen spacecraft is magnetosphere ring current instrument that will provide data for answering three over-arching questions Program: RBSPICE determine “how space weather creates storm-time around Earth, how supplies and supports creation of radiation belt populations,” involved in losses. a time-of-flight versus total energy measures ions over range from ∼20 keV to ∼1 MeV. also measure electrons ∼25 MeV order...
The Kuiper Belt is a distant region of the Solar System. On 1 January 2019, New Horizons spacecraft flew close to (486958) 2014 MU69, Cold Classical Object, class objects that have never been heated by Sun and are therefore well preserved since their formation. Here we describe initial results from these encounter observations. MU69 bi-lobed contact binary with flattened shape, discrete geological units, noticeable albedo heterogeneity. However, there little surface color compositional No...
The Energetic Particle Detector (EPD) Investigation is one of 5 fields-and-particles investigations on the Magnetospheric Multiscale (MMS) mission. MMS comprises 4 spacecraft flying in close formation highly elliptical, near-Earth-equatorial orbits targeting understanding fundamental physics important physical process called magnetic reconnection using Earth’s magnetosphere as a plasma laboratory. EPD two sensor types, Ion Spectrometer (EIS) with instrument each spacecraft, and Fly’s Eye...
New Horizons unveils the Pluto system In July 2015, spacecraft flew through at high speed, humanity's first close look this enigmatic on outskirts of our solar system. a series papers, team present their analysis encounter data downloaded so far: Moore et al. complex surface features and geology its large moon Charon, including evidence tectonics, glacial flow, possible cryovolcanoes. Grundy analyzed colors chemical compositions surfaces, with ices H 2 O, CH 4 , CO, N NH 3 reddish material...
Summary Spectrophotometric evidence was obtained that Δ 2 and 2:4 aldehydes are produced during the autoxidation of cottonseed oil. The unsaturated carbonyls were converted into semicarbazones 2,4‐dinitrophenylhydrazones whose characteristics indicated oxidation oil produces ‐decadienal, ‐octenal, hexanal. Although exact mechanism their formation has not been established, these believed to result from decomposition isomeric hydroperoxides linoleic acid, principal fatty acid constituent
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel reactions and a general mechanism for flavoenzyme-catalyzed dehydrogenationsGordon A. Hamilton Lawrence E. BrownCite this: J. Am. Chem. Soc. 1970, 92, 24, 7225–7227Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1970https://pubs.acs.org/doi/10.1021/ja00727a049https://doi.org/10.1021/ja00727a049research-articleACS PublicationsRequest reuse permissionsArticle...
Abstract We present an analysis of Parker Solar Probe ( PSP ) IS⊙IS observations ∼30–300 keV n −1 ions on 2018 November 11 when was about 0.25 au from the Sun. Five hours before onset a solar energetic particle (SEP) event, coronal mass ejection (CME) observed by STEREO-A /COR2, which crossed day later. No shock locally at , but CME may have driven weak earlier. The SEP event dispersive, with higher energy arriving lower ones. Timing suggests particles originated it ∼7.4 R ⊙ . intensities...
The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) comprises the hardware and accompanying science investigation on New Horizons spacecraft to measure pick-up ions from Pluto's outgassing atmosphere. To extent that retains its characteristics similar those of a "heavy comet" as detected in stellar occultations since early 1980s, these measurements will characterize neutral atmosphere while providing consistency check atmospheric escape rate at encounter epoch with...
Abstract Characterizing Europa’s subsurface ocean is essential for assessing habitability. The suite of instruments on the Europa Clipper spacecraft will, among others, magnetically sound interior by measuring ocean’s induced magnetic field. This field generated in response to Jovian time-varying environment which immersed. However, dynamic magnetized plasma flow magnetosphere creates electrical currents that give rise perturbations near Europa. These complicate interpretation induction...
When the solar wind hits Jupiter's magnetic field, it creates a long magnetotail trailing behind planet that channels material out of Jupiter system. The New Horizons spacecraft traversed length jovian to >2500 radii (RJ; 1 RJ identical with 71,400 kilometers), observing high-temperature, multispecies population energetic particles. Velocity dispersions, anisotropies, and compositional variation seen in deep-tail (greater, similar 500 RJ) approximately 3-day periodicity are variations closer...
The open mapping and closed graph theorems are usually stated in terms of metrizable topological groups which complete a one-sided uniformity.It would be desirable to use only the weaker hypothesis completeness two-sided uniformity.Important results this sort already known, it is our purpose strengthen those by removing separability hypotheses.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdrenal medulla imaging agents: a structure-distribution relationship study of radiolabeled aralkylguanidinesDonald M. Wieland, Thomas J. Mangner, Muthiah N. Inbasekaran, Lawrence E. Brown, and Jiann Long WuCite this: Med. Chem. 1984, 27, 2, 149–155Publication Date (Print):February 1, 1984Publication History Published online1 May 2002Published inissue 1 February...
Abstract Oxidation of fatty acids in peanut butter produces peroxides and changes the conjugated diene contents. Two most widely used methods for measuring these oxidative effects, peroxide value spectrophotometric assay hydroperoxides, were compared determinations shelf‐life stability butters during short long term storage. Results by hydroperoxides method correlated with those over 4 12 week storage periods. The requires smaller samples is quicker, more accurate, simpler than method, nor...
The Energetic Particle Instrument–Low Energy (EPI-Lo) experiment has detected several weak, low-energy (∼30–300 keV nucleon–1) solar energetic particle (SEP) events during its first two closest approaches to the Sun, providing a unique opportunity explore sources of acceleration. As part Parker Solar Probe (PSP) Integrated Science Investigation Sun (IS⊙IS) suite, EPI-Lo was designed investigate physics particles; however, in special lowest-energy "time-of-flight only" product used this...
view Abstract Citations (44) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Lithium Isotope Ratio in Population II Halo Dwarfs: A Proposed Test of the Late Decaying Massive Particle Nucleosynthesis Scenario Brown, Lawrence ; Schramm, David N. It is shown that observations lithium isotope ratio high surface temperature stars may be critical to cosmological nucleosynthesis models. In particular, decaying particle scenarios as derived some...
The effects of two tetrahydrocannabinols (Δ 8 -THC and Δ 9 -THC) were studied by stimulating primary somatosensory cortex in the cerveau isole squirrel monkey recording responses frontal lobe polysensory areas ipsi- contralateral to stimulus, parietal area, homotopic stimulus. Low doses both THC9s increased amplitudes higher generally decreased them. pentobarbital also produced increases amplitude or abolished responses. only slightly facilitation seen control recovery cycles, but even low...
Taken together, the Voyager 1 and 2 (V1 V2) spacecraft have collected over 11 yr of data in heliosheath. Despite extensive study, energetic particles magnetic fields measured heliosheath not been reconciled by existing models. In particular, differences between particle intensity variations at V1 V2 are unexplained. While intensities change gradually 7 heliosheath, those vary a factor ∼10 yr. Energetic show temporally coherent broad range species energies: from suprathermal ions (10s keV) to...
Abstract NASA's Juno spacecraft successfully completed its first science polar pass over Jupiter's northern and southern aurora, with all the instruments powered, on 27 August 2016. Observations of conical energetic proton distributions at low altitudes (<6 R J ) region are interpreted as resulting from transversely (to local magnetic field lines) accelerated H + a position planetward point observation. The conics were observed within broad upward beaming electrons accompanied by...
Abstract We augment the heliospheric network of galactic cosmic ray (GCR) monitors using 2012–2017 penetrating radiation measurements from New Horizons (NH) Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI), obtaining intensities ≳75 MeV particles. The new, predominantly GCR observations provide critical links between Sun and Voyager 2 1 (V2 V1), in heliosheath local interstellar medium (LISM), respectively. NH, Advanced Composition Explorer (ACE), V2, V1 observations,...