1,063 research outputs found
Estimating healthcare demand for an aging population: a flexible and robust bayesian joint model
In this paper, we analyse two frequently used measures of the demand for health care, namely hospital visits and out-of-pocket health care expenditure, which have been analysed separately in the existing literature. Given that these two measures of healthcare demand are highly likely to be closely correlated, we propose a framework to jointly model hospital visits and out-of-pocket medical expenditure. Furthermore, the joint framework allows for the presence of non-linear effects of covariates using splines to capture the effects of aging on healthcare demand. Sample heterogeneity is modelled robustly with the random effects following Dirichlet process priors with explicit cross-part correlation. The findings of our empirical analysis of the U.S. Health and Retirement Survey indicate that the demand for healthcare varies with age and gender and exhibits significant cross-part correlation that provides a rich understanding of how aging affects health care demand, which is of particular policy relevance in the context of an aging population
On the Absorption and Emission Spectra of Rare Earth Crystals
In this paper the results of investigation of the emission and absorption spectra of the rare earth ions like La++, Ce+++, etc., in crystals
are given. An attempt has been made to correlate their absorption and emmision spectra with special
reference to Ce+++ions.It has been observed that the La++ ions in crystals do not fluoresce. The emission spectra due to Ce+++ ions in the chloride and the sulphate crystals consist of two discrete bands. The positions of the bands are slightly different in the two salts but they occupy almost the same positions whether the salts investigated ate hydrated or dehydrated. The spectra due to CeF3 consist of three such emission bands; further on excitation with high frequency a weak Huminescence appears on the long wave side of the bands
Reunion of Vicious Walkers: Results from -Expansion -
The anomalous exponent, , for the decay of the reunion probability
of vicious walkers, each of length , in dimensions,
is shown to come from the multiplicative renormalization constant of a
directed polymer partition function. Using renormalization group(RG) we
evaluate to . The survival probability exponent is
. For , our RG is exact and stops at .
For , the log corrections are also determined. The number of walkers that
are sure to reunite is 2 and has no expansion.Comment: No of pages: 11, 1figure on request, Revtex3,IP/BBSR/929
Entanglement entropy of a quantum unbinding transition and entropy of DNA
Two significant consequences of quantum fluctuations are entanglement and
criticality. Entangled states may not be critical but a critical state shows
signatures of universality in entanglement. A surprising result found here is
that the entanglement entropy may become arbitrarily large and negative near
the dissociation of a bound pair of quantum particles. Although apparently
counter-intuitive, it is shown to be consistent and essential for the phase
transition, by mapping to a classical problem of DNA melting. We associate the
entanglement entropy to a subextensive part of the entropy of DNA bubbles,
which is responsible for melting. The absence of any extensivity requirement in
time makes this negative entropy an inevitable consequence of quantum mechanics
in continuum. Our results encompass quantum critical points and first-order
transitions in general dimensions.Comment: v2: 6 pages, 3 figures (title modified, more details and figures
added
Dynamic instability of microtubules: effect of catastrophe-suppressing drugs
Microtubules are stiff filamentary proteins that constitute an important
component of the cytoskeleton of cells. These are known to exhibit a dynamic
instability. A steadily growing microtubule can suddenly start depolymerizing
very rapidly; this phenomenon is known as ``catastrophe''. However, often a
shrinking microtubule is ``rescued'' and starts polymerizing again. Here we
develope a model for the polymerization-depolymerization dynamics of
microtubules in the presence of {\it catastrophe-suppressing drugs}. Solving
the dynamical equations in the steady-state, we derive exact analytical
expressions for the length distributions of the microtubules tipped with
drug-bound tubulin subunits as well as those of the microtubules, in the
growing and shrinking phases, tipped with drug-free pure tubulin subunits. We
also examine the stability of the steady-state solutions.Comment: Minor corrections; final published versio
- …