1,172 research outputs found
Hydrodynamic Thermonuclear Runaways in Superbursts
We calculate the thermal and dynamical evolution of the surface layers of an
accreting neutron star during the rise of a superburst. For the first few hours
following unstable 12C ignition, the nuclear energy release is transported by
convection. However, as the base temperature rises, the heating time becomes
shorter than the eddy turnover time and convection becomes inefficient. This
results in a hydrodynamic nuclear runaway, in which the heating time becomes
shorter than the local dynamical time. Such hydrodynamic burning can drive
shock waves into the surrounding layers and may be the trigger for the normal
X-ray burst found to immediately precede the onset of the superburst in both
cases where the Rossi X-Ray Timing Explorer was observing.Comment: 4 pages, 3 figures (emulateapj), accepted to ApJ Letter
Montana\u27s Real Property Forfeiture Statute: Will It Pass Constitutional Muster?
Montana\u27s Real Property Forfeiture Statute: Will it pass constitutional muster
Montana\u27s Real Property Forfeiture Statute: Will It Pass Constitutional Muster?
Montana\u27s Real Property Forfeiture Statute: Will it pass constitutional muster
The Ursinus Weekly, February 27, 1903
A view of athletics in our schools and colleges • Monday Night Club • God\u27s hand in history • Freshman declamation contest • Society notes • Alumni notes • Ursinus Publication, No. 2https://digitalcommons.ursinus.edu/weekly/3076/thumbnail.jp
Iec 61850-based communication networks of distribution system against cyber and physical failures
This paper proposes a decentralized control approach using a co-simulation platform to monitor protective elements and provide complete protection scheme for distribution systems. Real time measurements are obtained by interfacing the system model in RSCAD/RTDS with SEL 421 protective relays and publish/subscribe the voltage and current signals of the buses and transmission lines based on IEC 61850 communication protocol to isolate the fault correctly. The proposed technique helps to identify the location of the fault and introduces primary and buck protection for the system. The communication networks assists in facing cyber and physical threats and finding a new path for healthy relays to remove faults from the system. This technique is investigated on an IEEE 14 bus system for all possible fault locations. The proposed scheme can clear the fault by isolating the minimum part of the system and improving the endurance of the power in it. The system shows the smooth information flow between the cyber and physical parts to isolate faults in it in different cases
Vascularization of the Selaginella rhizophore: anatomical fingerprints of polar auxin transport with implications for the deep fossil record
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138403/1/nph14478_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138403/2/nph14478-sup-0005-Legends.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138403/3/nph14478.pd
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