175 research outputs found
On the analyticity and the almost periodicity of the solution to the Euler equations with non-decaying initial velocity
AbstractThe Cauchy problem of the Euler equations in the whole space is considered with non-decaying initial velocity in the frame work of B∞,11. It is proved that if the initial velocity is real analytic then the solution is also real analytic in spatial variables. Furthermore, a new estimate for the size of the radius of convergence of Taylor's expansion is established. The key of the proof is to derive the suitable estimates for the higher order derivatives of the bilinear terms. It is also shown the propagation of the almost periodicity in spatial variables
X-raying the Birth of Binary Neutron Stars and Neutron Star-Black Hole Binaries
We consider fallback accretion after an ultra-stripped supernova (USSN) that
accompanies formation of a binary neutron star (BNS) or a neutron star-black
hole binary (NS-BH). The fallback matter initially accretes directly to the
nascent NS, while it starts to accrete to the circumbinary disk, typically
0.1\mbox{-}1\, \mathrm{day} after the onset of the USSN explosion. The
circumbinary disk mass further accretes, forming mini disks around each compact
object, with a super-Eddington rate up to a few years. We show that such a
system constitutes a binary ultraluminous X-ray source (ULX), and a fraction of
the X rays can emerge through the USSN ejecta. We encourage follow-up
observations of USSNe within and \sim
100\mbox{-}1,000\,\mathrm{day} after the explosion using Chandra, XMM Newton
and NuSTAR, which could detect the X-ray counterpart with time variations
representing the properties of the nascent compact binary, e.g., the orbital
motion of the binary, the spin of the NS, and/or the quasiperiodic oscillation
of the mini disks.Comment: 12 pages, 5 figure
Open Multi-Access Network Platform with Dynamic Task Offloading and Intelligent Resource Monitoring
We constructed an open multi-access network platform using open-source
hardware and software. The open multi-access network platform is characterized
by the flexible utilization of network functions, integral management and
control of wired and wireless access networks, zero-touch provisioning,
intelligent resource monitoring, and dynamic task offloading. We also propose
an application-driven dynamic task offloading that utilizes intelligent
resource monitoring to ensure effective task processing in edge and cloud
servers. For this purpose, we developed a mobile application and server
applications for the open multi-access network platform. To investigate the
feasibility and availability of our developed platform, we experimentally and
analytically evaluated the effectiveness of application-driven dynamic task
offloading and intelligent resource monitoring. The experimental results
demonstrated that application-driven dynamic task offloading could reduce
real-time task response time and traffic over metro and core networks
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