Browsing UMBC Physics Department by Title
Now showing items 180-199 of 971
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Early Results from New Initiatives on SLR Tracking of GNSS and Synchronous Satellites
On November 16, 2013, at the 18th International Workshop on Laser Ranging in Fujiyoshida, Japan, the attendees adopted a resolution endorsing expanded ILRS tracking on Global Navigation Satellite System—GNSS satellites ... -
EARTH ORIENTATION PARAMETERS FROM SATELLITE LASER RANGING
(NASA, 2004-06)We present the new re-analysis of Satellite Laser Ranging (SLR) data to LAGEOS 1/2 and ETALON 1/2 for the definition of the Terrestrial Reference Frame (TRF) and its crust-fixed orientation (Earth Orientation Parameters ... -
The Earth's frame-dragging via laser-ranged satellites: A Response to "Some considerations on the present-day results for the detection of frame-dragging after the final outcome of GP-B" by Iorio L.
(IOP, 2011-10-24)In this letter, we reply to the preceding paper by Iorio (EPL, 96 (2011) 30001 (this issue)), hereafter referred to as I2011, where we address criticisms regarding the Lense-Thirring frame-dragging experiment results ... -
Echo Emission from Dust Scattering and X-Ray Afterglows of Gamma-Ray Bursts
(IOP, 2007-11-23)We investigate the effect of X-ray echo emission in gamma-ray bursts (GRBs). We find that the echo emission can provide an alternative way of understanding X-ray shallow decays and jet breaks. In particular, a shallow decay ... -
Eddy covariance fluxes of acyl peroxy nitrates (PAN, PPN and MPAN) above a Ponderosa pine forest
(Copernicus, 2009-01-27)During the Biosphere Effects on AeRosols and Photochemistry EXperiment 2007 (BEARPEX-2007), we observed eddy covariance (EC) fluxes of speciated acyl peroxy nitrates (APNs), including peroxyacetyl nitrate (PAN), peroxypropionyl ... -
Effect of Exam Wrappers on Student Achievement in Multiple, Large STEM Courses
Metacognition, the ability to think about and regulate one’s thinking, is an important factor in effective student learning. One intervention to promote student metacognition is the exam wrapper—a reflection students ... -
The effect of varying levels of surfactant on the reactive uptake of N₂O₅ to aqueous aerosol
(Copernicus Publications, 2006-05-22)Recent observations have detected surface active organics in atmospheric aerosols. We have studied the reaction of N₂O₅ on aqueous natural seawater and NaCl aerosols as a function of sodium dodecyl sulfate (SDS) concentration ... -
Effects of Climate Change on Earth’s Parameters
Climate change at global scale affects Earth characteristics that can be detected by measuring global parameters such as Earth rotation and centre of mass variations. Similarly, changes in the harmonics of Earth’s gravitational ... -
Effects of the 10 September 2017 Solar Flare on the Density and Composition of the Thermosphere of Mars
(American Geophysical Union, 2020-10-10)The effects of solar flares on the upper atmosphere of Mars are large but poorly constrained by observations. These effects are an important aspect of the response of Mars to space weather events and may also influence the ... -
Efficiency of Harmonic Quantum Otto Engines at Maximal Power
(MDPI, 2018-12-15)Recent experimental breakthroughs produced the first nano heat engines that have the potential to harness quantum resources. An instrumental question is how their performance measures up against the efficiency of classical ... -
Efficient multi-angle polarimetric inversion of aerosols and ocean color powered by a deep neural network forward model
(Copernicus Publications, 2021-02-09)NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, scheduled for launch in the timeframe of 2023, will carry a hyperspectral Ocean Color Instrument (OCI) and two Multi-Angle Polarimeters (MAP): the UMBC ... -
Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
(American Association for the Advancement of Science (AAAS), 2018-02-28)Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsations have been detected from all ... -
An Ejecta Kinematics Study of Kepler’s Supernova Remnant with High-Resolution Chandra HETG Spectroscopy
(2019-05-16)We report measurements of the bulk radial velocity from a sample of small, metal-rich ejecta knots in Kepler's Supernova Remnant (SNR). We measure the Doppler shift of the He-like Si Kα line center energy in the spectra ... -
Electromagnetic emission from a binary black hole merger remnant in plasma: Field alignment and plasma temperature
(American Physical Society, 2021-03-26)Comparable-mass black-hole mergers generically result in moderate to highly spinning holes, whose spacetime curvature will significantly affect nearby matter in observable ways. We investigate how the moderate spin of a ... -
Electron-positron jets associated with the quasar 3C279
(Brandeis University, 1998)A long outstanding problem in extragalactic astrophysics is the composition of the relativistic jets of plasma streaming from the nuclei of quasars and active galaxies - whether it is predominantly a "normal" (electron-proton) ... -
Elevated radio fluxes in flaring FSRQ PKS 0502+049
(2013-03-07) -
Elucidating the global distribution of reprocessing gas in NGC 1194
(2020-08-10)A joint XMM-Newton and NuSTAR observation was conducted for the bright, local Seyfert 1.9 galaxy, NGC 1194. The hard spectral form of this AGN was modeled using the toroidal reprocessor MYTORUS. The decoupled model form ... -
Employing Trapped Cold Ions to Verify the Quantum Jarzynski Equality
(American Physical Society (APS), 2008-08-14)We propose a scheme to investigate the nonequilibrium work distribution of a quantum particle under well controlled transformations of the external potential, exploiting the versatility of a single ion in a segmented linear ... -
Endoreversible Otto engines at maximal power
(2020-03-24)Despite its idealizations, thermodynamics has proven its power as a predictive theory for practical applications. In particular, the Curzon-Ahlborn efficiency provides a benchmark for any real engine operating at maximal ...