7,165 research outputs found
The neighborhood of Saturdays : memories of a multi-ethnic community on Indianapolis' south side
Strong Gravitational Lensing and Dark Energy Complementarity
In the search for the nature of dark energy most cosmological probes measure
simple functions of the expansion rate. While powerful, these all involve
roughly the same dependence on the dark energy equation of state parameters,
with anticorrelation between its present value w_0 and time variation w_a.
Quantities that have instead positive correlation and so a sensitivity
direction largely orthogonal to, e.g., distance probes offer the hope of
achieving tight constraints through complementarity. Such quantities are found
in strong gravitational lensing observations of image separations and time
delays. While degeneracy between cosmological parameters prevents full
complementarity, strong lensing measurements to 1% accuracy can improve
equation of state characterization by 15-50%. Next generation surveys should
provide data on roughly 10^5 lens systems, though systematic errors will remain
challenging.Comment: 7 pages, 5 figure
Parametric resonance for antineutrino conversions using LSND best-fit results with a 3+1 flavor scheme
An analytical solution to a parametric resonance effect for antineutrinos in
a 3+1 flavor (active+sterile) scheme using multiple non-adiabatic density
shifts is presented. We derive the conditions for a full flavor conversion for
antineutrino oscillations
under the assumption that LSND best-fits for the mixing
parameters are valid in a short-baseline accelerator experiment. We show that
the parametric resonance effect can be exploited to increase the effective
antineutrino oscillation length by a factor of 10-40, thus sustaining a high
oscillation probability for a much longer period of time than in the vacuum
scenario. We propose a realistic experimental setup that could probe for this
effect which leaves a signature in terms of a specific oscillation probability
profile. Moreover, since the parametric resonance effect is valid in any 2 or
1+1 flavor approximation, our results could be suggestive for future
short-baseline accelerator neutrino detection experiments.Comment: 6 pages, 4 figure
A Retrospective Study Describing Documentation of Advance Care Planning in a Long Term Care Setting
Problem: Increased life expectancy and aging baby boomers will increase the population of those 65 years of age and older to nearly 20% of the United States population by 2030. It is estimated that 40-70% of this population will need long term care during their lifetime, and by 2020, 40% of patients in long term care will die there. As patients age, advance care planning (ACP) and advance directives (AD) should be completed to make their wishes known to healthcare providers and family. Despite legal requirements for completion at entry to healthcare settings, less than 95% of hospitalized patients and 50% of long term care patients have an AD or ACP.
Significance: Advance care planning increases patients’ quality of life, may decrease stress and ease decision making at end of life for patients and families. There is little research on the completion levels of ACP in long term care.
Purpose: The primary purpose of this retrospective study is to describe the level of ACP documentation in a long term care setting. A secondary purpose is to describe potential relationships between demographic, past medical history (PMH) and ACP variables
Design: Retrospective descriptive chart review
Results: More than 76% of patients at the facility were over the age of 65. Less than 43% of patients had an AD listed in their chart, and less than 31% of patients had an AD completed prior to admission at the long term care facility. At admission to the facility, only 7 of 29 (12.7%) patients that came from the hospital had an AD or ACP documented. Seven patients at the facility were listed as Hospice patients, and only three of seven (42.8%) had ACP documented. Only 33% of patients had an ACP meeting at the facility listed in their chart. Of ACP meetings that occurred, there was a high level of patient and family involvement in end of life decision making. A correlation was found between Alzheimer’s disease and ACP completion, as well as Medicaid insurance and ACP completion
Controlling the superconducting transition by spin-orbit coupling
Whereas there exists considerable evidence for the conversion of singlet
Cooper pairs into triplet Cooper pairs in the presence of inhomogeneous
magnetic fields, recent theoretical proposals have suggested an alternative way
to exert control over triplet generation: intrinsic spin-orbit coupling in a
homogeneous ferromagnet coupled to a superconductor. Here, we proximity-couple
Nb to an asymmetric Pt/Co/Pt trilayer, which acts as an effective spin-orbit
coupled ferromagnet owing to structural inversion asymmetry. Unconventional
modulation of the superconducting critical temperature as a function of
in-plane and out-of- plane applied magnetic fields suggests the presence of
triplets that can be controlled by the magnetic orientation of a single
homogeneous ferromagnet. Our studies demonstrate for the first time an active
role of spin-orbit coupling in controlling the triplets -- an important step
towards the realization of novel superconducting spintronic devices.Comment: 11 pages + 4 figures + supplemental informatio
Contiguous redshift parameterizations of the growth index
The growth rate of matter perturbations can be used to distinguish between
different gravity theories and to distinguish between dark energy and modified
gravity at cosmological scales as an explanation to the observed cosmic
acceleration. We suggest here parameterizations of the growth index as
functions of the redshift. The first one is given by that
interpolates between a low/intermediate redshift parameterization
and a high
redshift constant value. For example, our interpolated form
can be used when including the CMB to the rest of the data while
the form can be used otherwise. It is found that the
parameterizations proposed achieve a fit that is better than 0.004% for the
growth rate in a CDM model, better than 0.014% for
Quintessence-Cold-Dark-Matter (QCDM) models, and better than 0.04% for the flat
Dvali-Gabadadze-Porrati (DGP) model (with ) for the entire
redshift range up to . We find that the growth index parameters
take distinctive values for dark energy models and
modified gravity models, e.g. for the CDM model
and for the flat DGP model. This provides a means for future
observational data to distinguish between the models.Comment: 7 pages, 6 figures, matches PRD accepted versio
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