503 research outputs found
-anonymous Signaling Scheme
We incorporate signaling scheme into Ad Auction setting, to achieve better
welfare and revenue while protect users' privacy. We propose a new
\emph{-anonymous signaling scheme setting}, prove the hardness of the
corresponding welfare/revenue maximization problem, and finally propose the
algorithms to approximate the optimal revenue or welfare
A study of dynamical processes in the Orion KL region using ALMA-- Probing molecular outflow and inflow
This work reports a high spatial resolution observations toward Orion KL
region with high critical density lines of CHCN (12-11) and
CHOH (8-7) as well as continuum at 1.3 mm band.
The observations were made using the Atacama Large Millimeter/Submillimeter
Array with a spatial resolution of 1.5 and sensitives
about 0.07 K and 0.18 K for continuum and line, respectively. The
observational results showed that the gas in the Orion KL region consists of
jet-propelled cores at the ridge and dense cores at east and south of the
region, shaped like a wedge ring. The outflow has multiple lobes, which may
originate from an explosive ejection and is not driven by young stellar
objects. Four infrared bubbles were found in the Spitzer/IRAC emissions. These
bubbles, the distributions of the previously found H jets, the young
stellar objects and molecular gas suggested that BN is the explosive center.
The burst time was estimated to be 1300 years. In the mean time,
signatures of gravitational collapse toward Source I and hot core were detected
with material infall velocities of 1.5 km~s and 0.6 km~s,
corresponding to mass accretion rates of 1.210M_{\sun}/Yr and
8.010M_{\sun}/Yr, respectively. These observations may support
that high-mass stars form via accretion model, like their low-mass
counterparts.Comment: Accepted to Ap
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