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Articles by D. Kaplan
The emission of interpulses by a 6.45-h-period coherent radio transient - Nature Astronomy
Abstract Long-period radio transients are a new class of astronomical objects characterized by prolonged periods ranging from 18 min to 54 min. They exhibit highly polarized, coherent, beamed radio emission lasting only 10–100 s. The intrinsic nature of these objects is subject to speculation, with highly magnetized white dwarfs and neutron stars being the prevailing candidates. Here we present ASKAP J183950.5−075635.0, boasting the longest known period of this class at 6.45 h.
Periodic radio and X-ray emission from an accreting white dwarf binary
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Abstract Long-period radio transients (LPTs) are coherent bursts of polarized radio emission that repeat periodically on timescales of minutes to hours. Little is known about the physical origins of these systems. Astronomers have proposed magnetars that rotate slowly and white dwarfs that rapidly orbit with a companion star as potential explanations. While several recent examples appear to support the latter hypothesis, the mechanism generating these bright radio pulses remains poorly understood.
By Kovi Rose, Joshua Pritchard, Tara Murphy, L. N. Driessen, D. Kaplan, M. Caleb, Ziteng Wang, A. Zic, J. J. Carney, B. N. Barlow, M. Gu, G. Heald, D. Huber, E. Lenc, J. Leung, W. J. Lu, M. Pedersen, Y. Qu, N. K. Rea, I. de Ruiter, K. A. Shaji, G. R. Sivakoff, Y. L. Wang, I. Andreoni, D. Dobie, R. Momose, A. J. M. Thomson, G. J. Yang, F. Zahedy
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An emission-state-switching radio transient with a 54-minute period - Nature Astronomy
Abstract Long-period radio transients are an emerging class of extreme astrophysical events of which only three are known. These objects emit highly polarized, coherent pulses of typically a few tens of seconds duration, and minutes to approximately hour-long periods. Although magnetic white dwarfs and magnetars, either isolated or in binary systems, have been invoked to explain these objects, a consensus has not emerged.
Inclusion of Trainee Stakeholders Is Necessary for Effective Change in Health-Service-Psychology Internship Training
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An 18-Year-Old Female Athlete Presenting with Knee Pain Following a Basketball Game and Diagnosed with Bilateral Patellar Stress Fractures.
The American Journal of Case Reports, Mar 2023 This is a preview of a remote PDF: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10042272/pdf/ N. Dhillon, G. Jackson, D. Kaplan, N. Verma. , The American Journal of Case Reports, 2023, pp. e938420-1, DOI: 10.12659/AJCR.938420
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Hydrodynamic Controls on Primary Producer Communities in Spring‐Fed Rivers
Research Letter Hydrodynamic Controls on Primary Producer Communities in Spring‐Fed Rivers D. A. Kaplan Corresponding Author E-mail address: dkaplan@ufl.edu https://orcid.org/0000-0002-0103-0928 Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL, USA Search for more papers by this author T. K.
Illuminating gravitational waves: A concordant picture of photons from a neutron star merger
The gravitational wave event GW170817 was caused by the merger of two neutron stars (see the Introduction by Smith). In three papers, teams associated with the GROWTH (Global Relay of Observatories Watching Transients Happen) project present their observations of the event at wavelengths from x-rays to radio waves. Evans et al. used space telescopes to detect GW170817 in the ultraviolet and place limits on its x-ray flux, showing that the merger generated a hot explosion known as a blue kilonova.
Illuminating gravitational waves: A concordant picture of photons from a neutron star merger
Merging neutron stars offer an exquisite laboratory for simultaneously studying strong-field gravity and matter in extreme environments. We establish the physical association of an electromagnetic counterpart (EM170817) to gravitational waves (GW170817) detected from merging neutron stars. By synthesizing a panchromatic dataset, we demonstrate that merging neutron stars are a long-sought production site forging heavy elements by r-process nucleosynthesis.
Biodegradable porous silk microtubes for tissue vascularization
Cardiovascular diseases are the leading cause of mortality around the globe, and microvasculature replacements to help stem these diseases are not available. Additionally, some vascular surgeries needing small-diameter vascular grafts present different performance requirements. In this work, silk fibroin scaffolds based on silk/polyethylene oxide blends were developed as microtubes for vasculature needs and for different tissue regeneration times, mechanical properties and structural designs.
Early developmental bisphenol-A exposure sex-independently impairs spatial memory by remodeling hippocampal dendritic architecture and synaptic transmission in rats : Scientific Reports
Previous work in our lab has demonstrated that BPA exposure impairs spatial memory and hippocampal dendritic spine formation through Wnt signaling pathway in SD male rats4. While, there are still some major questions remaining to be clarified. As a xenoestrogen chemical, whether the effect of BPA on spatial memory is sex-specific? Whether BPA impaired spatial memory by altering the network and neuronal connection in hippocampus? Whether and how BPA influences synaptic transmission?
New fast radio burst discovery finds 'missing matter' in the universe
An international team of scientists using a combination of radio and optical telescopes identified the distant location of a fast radio burst (FRB) for the first time. This discovery has allowed them to confirm the current cosmological model of the distribution of matter in the universe. The fast radio burst was detected on April 18, 2015 by the Commonwealth Scientific and Industrial Research Organisation (CSIRO)'s 64-meter Parkes radio telescope in Australia.
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