28,609 research outputs found
Recommended from our members
The Warburg Dance Movement Library-The WADAMO Library: A Validation Study
The Warburg Dance Movement Library is a validated set of 234 video clips of dance movements for empirical research in the fields of cognitive science and neuroscience of action perception, affect perception and neuroaesthetics. The library contains two categories of video clips of dance movement sequences. Of each pair, one version of the movement sequence is emotionally expressive (Clip a), while the other version of the same sequence (Clip b) is not expressive but as technically correct as the expressive version (Clip a). We sought to complement previous dance video stimuli libraries. Facial information, colour and music have been removed, and each clip has been faded in and out. We equalised stimulus length (6 seconds, 8 counts in dance theory), the dancers’ clothing and video background and included both male and female dancers, and we controlled for technical correctness of movement execution. The Warburg Dance Movement Library contains both contemporary and ballet movements. Two online surveys (N = 160) confirmed the classification into the two categories of expressivity. Four additional online surveys (N = 80) provided beauty and liking ratings for each clip. A correlation matrix illustrates all variables of this norming study (technical correctness, expressivity, beauty, liking, luminance, motion energy)
Chelate-modified polymers for atmospheric gas chromatography
Chromatographic materials were developed to serve as the stationary phase of columns used in the separation of atmospheric gases. These materials consist of a crosslinked porous polymer matrix, e.g., a divinylbenzene polymer, into which has been embedded an inorganic complexed ion such as N,N'-ethylene-bis-(acetylacetoniminato)-cobalt (2). Organic nitrogenous bases, such as pyridine, may be incorporated into the chelate polymer complexes to increase their chromatographic utility. With such materials, the process of gas chromatography is greatly simplified, especially in terms of time and quantity of material needed for a gas separation
A flight investigation of simulated data link communications during single-pilot IFR flight
A Flight Data Console (FDC) was developed to allow simulation of a digital communications link to replace the current voice communication system used in air traffic control (ATC). The voice system requires manipulation of radio equipment, read-back of clearances, and mental storage of critical information items, all contributing to high workload, particularly during single-pilot operations. This was an inflight study to determine how a digital communications system might reduce cockpit workload, improve flight proficiency, and be accepted by general aviation pilots. Results show that instrument flight, including approach and landing, can be accomplished quite effectively using a digital data link system for ATC communications. All pilots expressed a need for a back-up voice channel. When included, this channel was used sparingly and principally to confirm any item of information about which there might be uncertainty
Pair Production of MSSM Higgs Bosons in the Non-decoupling Region at the LHC
We consider the Higgs boson signals from pair production at the LHC within
the framework of the MSSM in the non-decoupling (low-m_A) region. In light of
the recent observation of a SM-like Higgs boson, we argue that the exploration
for Higgs pair production at the LHC is a crucial next step to probe the MSSM
Higgs sector. We emphasize that the production of H^\pm A^0 and H^{+}H^{-}
depends only on the electroweak gauge couplings while all the leading Higgs
production channels via gluon fusion, vector-boson fusion, and Higgsstrahlung
depend on additional free Higgs sector parameters. In the non-decoupling
region, the five MSSM Higgs bosons are all relatively light and pair production
signals may be accessible. We find that at the 8 TeV LHC, a 5\sigma signal for
H^\pm A^0, H^\pm h^0 -> \tau^{\pm}\nu b\bar b and H^{+}H^{-} -> \tau^{+}\nu
\tau^{-}\nu are achievable with an integrated luminosity of 7 (11) fb^{-1} and
24 (48) fb^{-1}, respectively for m_A=95 (130) GeV. At the 14 TeV LHC, a
5\sigma signal for these two channels would require as little as 4 (7) fb^{-1}
and 10 (19) fb^{-1}, respectively.Comment: 20 pages, 8 figures and 3 tables. Version to appear in PR
Mapping Ohio's Compassion
This report gives an overview of the state of the nonprofit sector in Ohio
Improvements to Stellar Structure Models, Based on a Grid of 3D Convection Simulations. I. -Relations
Relations between temperature, T, and optical depth, tau, are often used for
describing the photospheric transition from optically thick to optically thin
in stellar structure models. We show that this is well justified, but also that
currently used T(tau) relations are often inconsistent with their
implementation. As an outer boundary condition on the system of stellar
structure equations, T(tau) relations have an undue effect on the overall
structure of stars. In this age of precision asteroseismology, we need to
re-assess both the method for computing and for implementing T(tau) relations,
and the assumptions they rest on. We develop a formulation for proper and
consistent evaluation of T(tau) relations from arbitrary 1D or 3D stellar
atmospheres, and for their implementation in stellar structure and evolution
models. We extract radiative T(tau) relations, as described by our new
formulation, from 3D simulations of convection in deep stellar atmospheres of
late-type stars from dwarfs to giants. These simulations employ realistic
opacities and equation of state, and account for line-blanketing. For
comparison, we also extract T(tau) relations from 1D MARCS model atmospheres
using the same formulation. T(tau)-relations from our grid of 3D convection
simulations display a larger range of behaviours with surface gravity, compared
with those of conventional theoretical 1D hydrostatic atmosphere models. Based
on this, we recommend no longer to use scaled solar T(tau) relations. Files
with T(tau) relations for our grid of simulations are made available to the
community, together with routines for interpolating in this irregular grid. We
also provide matching tables of atmospheric opacity, for consistent
implementation in stellar structure models.Comment: 18 pages, 7 figures, 2 tables. Accepted for publication in MNRAS,
201
Improvements to stellar structure models, based on a grid of 3D convection simulations. II. Calibrating the mixing-length formulation
We perform a calibration of the mixing length of convection in stellar
structure models against realistic 3D radiation-coupled hydrodynamics (RHD)
simulations of convection in stellar surface layers, determining the adiabat
deep in convective stellar envelopes.
The mixing-length parameter is calibrated by matching averages of
the 3D simulations to 1D stellar envelope models, ensuring identical atomic
physics in the two cases. This is done for a previously published grid of
solar-metallicity convection simulations, covering from 4200 K to 6900 K on the
main sequence, and 4300-5000 K for giants with logg=2.2.
Our calibration results in an varying from 1.6 for the warmest
dwarf, which is just cool enough to admit a convective envelope, and up to 2.05
for the coolest dwarfs in our grid. In between these is a triangular plateau of
~ 1.76. The Sun is located on this plateau and has seen little change
during its evolution so far. When stars ascend the giant branch, they largely
do so along tracks of constant , with decreasing with
increasing mass.Comment: 22 pages, 15 figures, accepted for publication in MNRA
Examining the crossover from hadronic to partonic phase in QCD
It is argued that, due to the existence of two vacua -- perturbative and
physical -- in QCD, the mechanism for the crossover from hadronic to partonic
phase is hard to construct. The challenge is: how to realize the transition
between the two vacua during the gradual crossover of the two phases. A
possible solution of this problem is proposed and a mechanism for crossover,
consistent with the principle of QCD, is constructed. The essence of this
mechanism is the appearance and growing up of a kind of grape-shape
perturbative vacuum inside the physical one. A dynamical percolation model
based on a simple dynamics for the delocalization of partons is constructed to
exhibit this mechanism. The crossover from hadronic matter to sQGP as well as
the transition from sQGP to wQGP in the increasing of temperature is
successfully described by using this model with a temperature dependent
parameter.Comment: 4 pages, 4 figure
- …