17,393 research outputs found
Religious liberty in Australia: Some suggestions and proposals for reframing traditional categorisations
No abstract is available for this article
Complete Phase Diagrams for a Holographic Superconductor/Insulator System
The gravitational dual of an insulator/superconductor transition driven by
increasing the chemical potential has recently been constructed. However, the
system was studied in a probe limit and only a part of the phase diagram was
obtained. We include the backreaction and construct the complete phase diagram
for this system. For fixed chemical potential there are typically two phase
transitions as the temperature is lowered. Surprisingly, for a certain range of
parameters, the system first becomes a superconductor and then becomes an
insulator as the temperature approaches zero. As a byproduct of our analysis,
we also construct the gravitational dual of a Bose-Einstein condensate of
glueballs in a confining gauge theory.Comment: 19 pages; v2: references adde
Early Results from TUS, the First Orbital Detector of Extreme Energy Cosmic Rays
TUS is the world's first orbital detector of extreme energy cosmic rays
(EECRs), which operates as a part of the scientific payload of the Lomonosov
satellite since May 19, 2016. TUS employs the nocturnal atmosphere of the Earth
to register ultraviolet (UV) fluorescence and Cherenkov radiation from
extensive air showers generated by EECRs as well as UV radiation from lightning
strikes and transient luminous events, micro-meteors and space debris. The
first months of its operation in orbit have demonstrated an unexpectedly rich
variety of UV radiation in the atmosphere. We briefly review the design of TUS
and present a few examples of events recorded in a mode dedicated to
registering EECRs.Comment: 8 pages, to appear in the proceedings of UHECR2016, Kyoto, 11-14
October 2016; version 2: minor changes following referee's suggestions;
version 3: typo in the caption of Fig.2 fixe
Numerical solution to the glancing sidewall oblique shock wave/turbulent boundary layer interaction in three dimension
A supersonic three-dimensional viscous forward-marching computer design code called PEPSIS is used to obtain a numerical solution of the three-dimensional problem of the interaction of a glancing sidewall oblique shock wave and a turbulent boundary layer. Very good results are obtained for a test case that was run to investigate the use of the wall-function boundary-condition approximation for a highly complex three-dimensional shock-boundary layer interaction. Two additional test cases (coarse mesh and medium mesh) are run to examine the question of near-wall resolution when no-slip boundary conditions are applied. A comparison with experimental data shows that the PEPSIS code gives excellent results in general and is practical for three-dimensional supersonic inlet calculations
Calculation of a circular jet in crossflow with a multiple-time-scale turbulence model
Numerical calculation of a three dimensional turbulent flow of a jet in a crossflow using a multiple time scale turbulence model is presented. The turbulence in the forward region of the jet is in a stronger inequilibrium state than that in the wake region of the jet, while the turbulence level in the wake region is higher than that in the front region. The calculated flow and the concentration fields are in very good agreement with the measured data, and it indicated that the turbulent transport of mass, concentration, and momentum is strongly governed by the inequilibrium turbulence. The capability of the multiple time scale turbulence model to resolve the inequilibrium turbulence field is also discussed
Validation of a three-dimensional viscous analysis of axisymmetric supersonic inlet flow fields
A three-dimensional viscous marching analysis for supersonic inlets was developed. To verify this analysis several benchmark axisymmetric test configurations were studied and are compared to experimental data. Detailed two-dimensional results for shock-boundary layer interactions are presented for flows with and without boundary layer bleed. Three dimensional calculations of a cone at angle of attack and a full inlet at attack are also discussed and evaluated. Results of the calculations demonstrate the code's ability to predict complex flow fields and establish guidelines for future calculations using similar codes
Spreading Disinformation on Facebook: Do Trust in Message Source, Risk Propensity, or Personality Affect the Organic Reach of “Fake News”?
There is considerable concern about the propagation of disinformation through social media, particularly for political purposes. 'Organic reach' has been found to be important in the propagation of disinformation on social networks. This is the phenomenon whereby social media users extend the audience for a piece of information: interacting with it, or sharing it with their wider networks, greatly increases the number of people the information reaches. This project evaluated the extent to which characteristics of the message source (how trustworthy they were) and the recipient (risk propensity and personality) influenced the organic reach of a potentially false message. In an online study, 357 Facebook users completed personality and risk propensity scales, and rated their likelihood of interacting in various ways with a message posted by either a trustworthy or untrustworthy source. Message source impacted on overall organic reach, with messages from trusted sources being more likely to be propagated. Risk propensity did not influence reach. However, low scores on trait agreeableness predicted greater likelihood of interacting with a message. Findings provide preliminary evidence that both message source and recipient characteristics can potentially influence the spread of disinformation
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Thermal-Expansion and Fracture Toughness Properties ofParts made from Liquid Crystal Stereolithography Resins
Liquid crystal (LC) resins are a new kind ofstereolithography material that can produce
parts with structured or ordered morphologies instead ofthe amorphous morphologies that result
from standard resins. The LC molecules can be aligned before cure resulting in an anisotropic
crosslinked network when the laser induced polymerization "locks-in" the alignment. Previous
papers have explored liquid crystal orientation dynamics [1], the effects of orientation on viscoelastic and mechanical properties [2,3], and the processing ofLC resins by stereolithography [4].
This paper considers the effects ofmorphology on fracture toughness and thermal-expansion
properties. Both toughness and thermal-stability continue to be important issues for
stereolithography parts. The use ofLC resins may provide a way to significantly improve
performance in both ofthese areas, and in addition result in parts with high upper use .
temperatures.Mechanical Engineerin
Graph-based Semi-Supervised & Active Learning for Edge Flows
We present a graph-based semi-supervised learning (SSL) method for learning
edge flows defined on a graph. Specifically, given flow measurements on a
subset of edges, we want to predict the flows on the remaining edges. To this
end, we develop a computational framework that imposes certain constraints on
the overall flows, such as (approximate) flow conservation. These constraints
render our approach different from classical graph-based SSL for vertex labels,
which posits that tightly connected nodes share similar labels and leverages
the graph structure accordingly to extrapolate from a few vertex labels to the
unlabeled vertices. We derive bounds for our method's reconstruction error and
demonstrate its strong performance on synthetic and real-world flow networks
from transportation, physical infrastructure, and the Web. Furthermore, we
provide two active learning algorithms for selecting informative edges on which
to measure flow, which has applications for optimal sensor deployment. The
first strategy selects edges to minimize the reconstruction error bound and
works well on flows that are approximately divergence-free. The second approach
clusters the graph and selects bottleneck edges that cross cluster-boundaries,
which works well on flows with global trends
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