5,688 research outputs found
Hawking radiation in a -dimensional static spherically-symmetric black Hole surrounded by quintessence
We present a solution of Einstein equations with quintessential matter
surrounding a -dimensional black hole, whose asymptotic structures are
determined by the state of the quintessential matter. We examine the
thermodynamics of this black hole and find that the mass of the black hole
depends on the equation of state of the quintessence, while the first law is
universal. Investigating the Hawking radiation in this black hole background,
we observe that the Hawking radiation dominates on the brane in the low-energy
regime. For different asymptotic structures caused by the equation of state of
the quintessential matter surrounding the black hole, we learn that the
influences by the state parameter of the quintessence on Hawking radiation are
different.Comment: 16 pages, Accepted for publication in Phys. Rev.
The place of expert systems in business now and over the next decade
Information technology has entered a new generation. In recent
years, considerable interest has been focussed on the
commercialisation of expert systems, which represent an important
application of Artificial Intelligence in the field of
Information Technology.
Expert systems are now in a crucial stage of development because,
although in business computerised systems are not new, expert
systems still need time for their applicability and usefulness to
be proved. The market for expert systems will not develop if
such systems are unable to cope with the demanding applications
of business; for example with top management problem-solving and
decision-making. This thesis is principally concerned with
determining the position of expert systems in business by looking
at these major business related issues. [Continues.
Using the CVP Traffic Detection Model at Road-Section Applies to Traffic Information Collection and Monitor - the Case Study
This paper proposes a using Cellular-Based Vehicle Probe (CVP) at road-section (RS) method to detect and setup a model for traffic flow information (info) collection and monitor. There are multiple traffic collection devices including CVP, ETC-Based Vehicle Probe (EVP), Vehicle Detector (VD), and CCTV as traffic resources to serve as road condition info for predicting the traffic jam problem, monitor and control. The main project has been applied at Tai # 2 Ghee-Jing roadway connects to Wan-Li section as a trial field on fiscal year of 2017-2018. This paper proposes a man-flow turning into traffic-flow with Long-Short Time Memory (LTSM) from recurrent neural network (RNN) model. We also provide a model verification and validation methodology with RNN for cross verification of system performance
Structural study in Highly Compressed BiFeO3 Epitaxial Thin Films on YAlO3
We report a study on the thermodynamic stability and structure analysis of
the epitaxial BiFeO3 (BFO) thin films grown on YAlO3 (YAO) substrate. First we
observe a phase transition of MC-MA-T occurs in thin sample (<60 nm) with an
utter tetragonal-like phase (denoted as MII here) with a large c/a ratio
(~1.23). Specifically, MII phase transition process refers to the structural
evolution from a monoclinic MC structure at room temperature to a monoclinic MA
at higher temperature (150oC) and eventually to a presence of nearly tetragonal
structure above 275oC. This phase transition is further confirmed by the
piezoforce microscopy measurement, which shows the rotation of polarization
axis during the phase transition. A systematic study on structural evolution
with thickness to elucidate the impact of strain state is performed. We note
that the YAO substrate can serve as a felicitous base for growing T-like BFO
because this phase stably exists in very thick film. Thick BFO films grown on
YAO substrate exhibit a typical "morphotropic-phase-boundary"-like feature with
coexisting multiple phases (MII, MI, and R) and a periodic stripe-like
topography. A discrepancy of arrayed stripe morphology in different direction
on YAO substrate due to the anisotropic strain suggests a possibility to tune
the MPB-like region. Our study provides more insights to understand the strain
mediated phase co-existence in multiferroic BFO system.Comment: 18 pages, 6 figures, submitted to Journal of Applied Physic
Coexistence of anterior communicating artery aneurysm and tuberculum sellae meningioma
SummaryTuberculum sellae meningioma is a common intracranial tumor. However, its coexistence with an intratumoral aneurysm is rare. Here, we present the case of a 65-year-old woman with progressive vision loss caused by a tuberculum sellae meningioma coexisting with an intratumoral anterior communicating artery aneurysm. Treatment modalities for patients with this rare coexisting pathology were reviewed. When an intracranial tumor is closely related to the major intracranial vessel, preoperative magnetic resonance imaging angiography, a safe and noninvasive imaging study, is suggested for the early diagnosis of a possible coexisting aneurysm and for reducing the risk of intraoperative aneurysm rupture
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