2,379 research outputs found
Literature Review
Each issue of Value-Based Purchasing will provide a summary of recent articles from the published VBP literature. In this issue, we spotlight several recent publications regarding pay-for-performance programs and financial incentives for quality care
Discovery of a Possible Early-T Thick-Disk Subdwarf from the AllWISE2 Motion Survey
We have discovered a potential T0 1 subdwarf from a search for sources
in the AllWISE2 Motion Survey that do not have counterparts in surveys at
shorter wavelengths. With a tangential velocity of 170 kms, this object -
WISE J071121.36-573634.2 - has kinematics that are consistent with the
thick-disk population of the Milky Way. Spectral fits suggest a low-metallicity
for this object but also allow for the possibility of unresolved multiplicity.
If WISE J0711-5736 is indeed an sdT0 dwarf, it would be only the second early-T
subdwarf discovered to date.Comment: 11 pages, 6 figures, accepted to A
Quantifying Nonequilibrium Behavior with Varying Cooling Rates
We investigate nonequilibrium behavior in (1+1)-dimensional stochastic field
theories in the context of Ginzburg-Landau models at varying cooling rates. We
argue that a reliable measure of the departure from thermal equilibrium can be
obtained from the absolute value of the rate of change of the
momentum-integrated structure function, . We show that the
peak of scales with the cooling, or quench, time-scale,
, in agreement with the prediction by Laguna and Zurek for the scaling
of freeze-out time in both over and under-damped regimes. Furthermore, we show
that the amplitude of the peak scales as independent of the
viscosity.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Let
Sub-Kolmogorov-Scale Fluctuations in Fluid Turbulence
We relate the intermittent fluctuations of velocity gradients in turbulence
to a whole range of local dissipation scales generalizing the picture of a
single mean dissipation length. The statistical distribution of these local
dissipation scales as a function of Reynolds number is determined in numerical
simulations of forced homogeneous isotropic turbulence with a spectral
resolution never applied before which exceeds the standard one by at least a
factor of eight. The core of the scale distribution agrees well with a
theoretical prediction. Increasing Reynolds number causes the generation of
ever finer local dissipation scales. This is in line with a less steep decay of
the large-wavenumber energy spectra in the dissipation range. The energy
spectrum for the highest accessible Taylor microscale Reynolds number
R_lambda=107 does not show a bottleneck.Comment: 8 pages, 5 figures (Figs. 1 and 3 in reduced quality
Arbitrary-order Hilbert spectral analysis for time series possessing scaling statistics: a comparison study with detrended fluctuation analysis and wavelet leaders
In this paper we present an extended version of Hilbert-Huang transform,
namely arbitrary-order Hilbert spectral analysis, to characterize the
scale-invariant properties of a time series directly in an amplitude-frequency
space. We first show numerically that due to a nonlinear distortion,
traditional methods require high-order harmonic components to represent
nonlinear processes, except for the Hilbert-based method. This will lead to an
artificial energy flux from the low-frequency (large scale) to the
high-frequency (small scale) part. Thus the power law, if it exists, is
contaminated. We then compare the Hilbert method with structure functions (SF),
detrended fluctuation analysis (DFA), and wavelet leader (WL) by analyzing
fractional Brownian motion and synthesized multifractal time series. For the
former simulation, we find that all methods provide comparable results. For the
latter simulation, we perform simulations with an intermittent parameter {\mu}
= 0.15. We find that the SF underestimates scaling exponent when q > 3. The
Hilbert method provides a slight underestimation when q > 5. However, both DFA
and WL overestimate the scaling exponents when q > 5. It seems that Hilbert and
DFA methods provide better singularity spectra than SF and WL. We finally apply
all methods to a passive scalar (temperature) data obtained from a jet
experiment with a Taylor's microscale Reynolds number Relambda \simeq 250. Due
to the presence of strong ramp-cliff structures, the SF fails to detect the
power law behavior. For the traditional method, the ramp-cliff structure causes
a serious artificial energy flux from the low-frequency (large scale) to the
high-frequency (small scale) part. Thus DFA and WL underestimate the scaling
exponents. However, the Hilbert method provides scaling exponents
{\xi}{\theta}(q) quite close to the one for longitudinal velocity.Comment: 13 pages, 10 figure
Using the Balanced Scorecard: Both Common And Unique Measures Are Informative
The balanced scorecard (BSC), developed by Kaplan and Norton (1992), allows an organization to translate its strategy and objectives into a series of performance measures. A recent study by Lipe and Salterio (2000) found that subjects use common scorecard measures in performance evaluation but disregard unique measures. This study finds that both common and unique scorecard measures are used in performance evaluation
Turbulent transport of material particles: An experimental study of finite size effects
We use an acoustic Lagrangian tracking technique, particularly adapted to
measurements in open flows, and a versatile material particles generator (in
the form of soap bubbles with adjustable size and density) to characterize
Lagrangian statistics of finite sized, neutrally bouyant, particles transported
in an isotropic turbulent flow of air. We vary the size of the particles in a
range corresponding to turbulent inertial scales and explore how the turbulent
forcing experienced by the particles depends on their size. We show that, while
the global shape of the intermittent acceleration probability density function
does not depend significantly on particle size, the acceleration variance of
the particles decreases as they become larger in agreement with the classical
scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow
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