30,381 research outputs found
Book Review on Free Will, Agency and Selfhood in Indian Philosophy (edited by Mathew R. Dasti and Edwin F. Bryant)
Human Wounds and Its Burden: An Updated Compendium of Estimates
Significance: A 2018 retrospective analysis of Medicare beneficiaries identified that ∼8.2 million people had wounds with or without infections. Medicare cost estimates for acute and chronic wound treatments ranged from 96.8 billion. Highest expenses were for surgical wounds followed by diabetic foot ulcers, with a higher trend toward costs associated with outpatient wound care compared with inpatient. Increasing costs of health care, an aging population, recognition of difficult-to-treat infection threats such as biofilms, and the continued threat of diabetes and obesity worldwide make chronic wounds a substantial clinical, social, and economic challenge.
Recent Advances: Chronic wounds are not a problem in an otherwise healthy population. Underlying conditions ranging from malnutrition, to stress, to metabolic syndrome, predispose patients to chronic, nonhealing wounds. From an economic point of view, the annual wound care products market is expected to reach $15–22 billion by 2024. The National Institutes of Health's (NIH) Research Portfolio Online Reporting Tool (RePORT) now lists wounds as a category.
Future Directions: A continued rise in the economic, clinical, and social impact of wounds warrants a more structured approach and proportionate investment in wound care, education, and related research
Phase Distribution in a Disordered Chain and the Emergence of a Two-parameter Scaling in the Quasi-ballistic to the Mildly Localized Regime
We study the phase distribution of the complex reflection coefficient in
different configurations as a disordered 1D system evolves in length, and its
effect on the distribution of the 4-probe resistance . The stationary () phase distribution is almost always strongly non-uniform and is in
general double-peaked with their separation decaying algebraically with growing
disorder strength to finally give rise to a single narrow peak at infinitely
strong disorder. Further in the length regime where the phase distribution
still evolves with length (i.e., in the quasi-ballistic to the mildly localized
regime), the phase distribution affects the distribution of the resistance in
such a way as to make the mean and the variance of diverge
independently with length with different exponents. As , these
two exponents become identical (unity). Obviously, these facts imply two
relevant parameters for scaling in the quasi-ballistic to the mildly localized
regime finally crossing over to one-parameter scaling in the strongly localized
regime.Comment: 12 LaTeX pages plus 3 EPS figure
Electronic transport in a randomly amplifying and absorbing chain
We study localization properties of a one-dimensional disordered system
characterized by a random non-hermitean hamiltonian where both the randomness
and the non-hermiticity arises in the local site-potential; its real part being
ordered (fixed), and a random imaginary part implying the presence of either a
random absorption or amplification at each site. The transmittance (forward
scattering) decays exponentially in either case. In contrast to the disorder in
the real part of the potential (Anderson localization), the transmittance with
the disordered imaginary part may decay slower than that in the case of ordered
imaginary part.Comment: 7 LaTex pages plus 2 PS figures; e-mail: [email protected]
Spherically confined isotropic harmonic oscillator
The generalized pseudospectral Legendre method is used to carry out accurate
calculations of eigenvalues of the spherically confined isotropic harmonic
oscillator with impenetrable boundaries. The energy of the confined state is
found to be equal to that of the unconfined state when the radius of
confinement is suitably chosen as the location of the radial nodes in the
unconfined state. This incidental degeneracy condition is numerically shown to
be valid in general. Further, the full set of pairs of confined states defined
by the quantum numbers [(n+1, \ell) ; (n, \ell+2)], n = 1,2,.., and with the
radius of confinement {(2 \ell +3)/2}^{1/2} a.u., which represents the single
node in the unconfined (1, \ell) state, is found to display a constant energy
level separation exactly given by twice the oscillator frequency. The results
of similar numerical studies on the confined Davidson oscillator with
impenetrable boundary as well as the confined isotropic harmonic oscillator
with finite potential barrier are also reported .The significance of the
numerical results are discussed.Comment: 28 pages, 4 figure
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