1,594 research outputs found
Social media adoption framework for aged care service providers in Australia
© 2017 IEEE. The aged care sector has been a late adopter of social media platforms for communicating, collaborating, marketing and creating brand awareness. There is little research that examines the adoption of social media by aged care service providers for these purposes. This paper reviews the status of social media adoption in the Australian aged care industry, to understand in what ways social media can serve older people's needs, and to develop recommendations for aged-care service providers to adopt social media applications to empower older people. Through a review of the literature and interviews with Australian experts, this paper suggests aged care providers use a three-phase framework when adopting social media in the aged care sector. The first phase is to adopt a popular public social media platform such as Facebook followed by Instagram and Twitter. The second phase supports interaction by encouraging posts and feedback by locally hosted member forums. The third phase is the adoption of specialised social applications for closed groups and specific functions. The paper concludes with a discussion on the implications of the framework and proposes directions for future research
P-wave Pairing and Colossal Magnetoresistance in Manganese Oxides
We point out that the existing experimental data of most manganese oxides
show the {\sl frustrated} p-wave superconducting condensation in the
ferromagnetic phase in the sense that the superconducting coherence is not long
enough to cover the whole system. The superconducting state is similar to the
state in superfluid He-3. The sharp drop of resistivity, the steep jump
of specific heat, and the gap opening in tunneling are well understood in terms
of the p-wave pairing. In addition, colossal magnetoresistance (CMR) is
naturally explained by the superconducting fluctuations with increasing
magnetic fields. The finite resistivity may be due to some magnetic
inhomogeneities. This study leads to the possibility of room temperature
superconductivity.Comment: LaTex, 14 pages, For more information, please send me an e-mail.
e-mail adrress : [email protected]
A particle system with explosions: law of large numbers for the density of particles and the blow-up time
Consider a system of independent random walks in the discrete torus with
creation-annihilation of particles and possible explosion of the total number
of particles in finite time. Rescaling space and rates for
diffusion/creation/annihilation of particles, we obtain a stong law of large
numbers for the density of particles in the supremum norm. The limiting object
is a classical solution to the semilinear heat equation u_t =u_{xx} + f(u). If
f(u)=u^p, 1<p \le 3, we also obtain a law of large numbers for the explosion
time
Gradient expansion approach to multiple-band Fermi liquids
Promoted by the recent progress of Berry phase physics in spin
galvanomagnetic communities, we develop a systematic derivation of the reduced
Keldysh equation (RKE) which captures the low-energy dynamics of
quasi-particles constrained within doubly degenerate bands forming a single
Fermi surface. Specifically, we project out the fully occupied/empty band
degrees of freedom perturbatively in the gradient expansion, whose coupling
constant measures how a system is disequilibrated. As for the electron-electron
interactions, however, we only employ the so-called adiabatic assumption of the
Fermi liquid theory, so that the effect of electron correlations onto the
adiabatic transport of quasi-particles, i.e. the hermitian (real) part of the
self-energy, is taken into account in an unbiased manner.Comment: 29 pages, 7 figure
Conserved Spin and Orbital Angular Momentum Hall Current in a Two-Dimensional Electron System with Rashba and Dresselhaus Spin-orbit Coupling
We study theoretically the spin and orbital angular momentum (OAM) Hall
effect in a high mobility two-dimensional electron system with Rashba and
Dresselhuas spin-orbit coupling by introducing both the spin and OAM torque
corrections, respectively, to the spin and OAM currents. We find that when both
bands are occupied, the spin Hall conductivity is still a constant (i.e.,
independent of the carrier density) which, however, has an opposite sign to the
previous value. The spin Hall conductivity in general would not be cancelled by
the OAM Hall conductivity. The OAM Hall conductivity is also independent of the
carrier density but depends on the strength ratio of the Rashba to Dresselhaus
spin-orbit coupling, suggesting that one can manipulate the total Hall current
through tuning the Rashba coupling by a gate voltage. We note that in a pure
Rashba system, though the spin Hall conductivity is exactly cancelled by the
OAM Hall conductivity due to the angular momentum conservation, the spin Hall
effect could still manifest itself as nonzero magnetization Hall current and
finite magnetization at the sample edges because the magnetic dipole moment
associated with the spin of an electron is twice as large as that of the OAM.
We also evaluate the electric field-induced OAM and discuss the origin of the
OAM Hall current. Finally, we find that the spin and OAM Hall conductivities
are closely related to the Berry vector (or gauge) potential.Comment: latest revised version; Accepted for publication in Physical Review
Anomalous Hall effect in 2D Dirac band: link between Kubo-Streda formula and semiclassical Boltzmann equation approach
The anomalous Hall effect (AHE) is a consequence of spin-orbit coupling in a
ferromagnetic metal and is related primarily to density-matrix response to an
electric field that is off-diagonal in band index. For this reason disorder
contributions to the AHE are difficult to treat systematically using a
semi-classical Boltzmann equation approach, even when weak localization
corrections are disregarded. In this article we explicitly demonstrate the
equivalence of an appropriately modified semiclassical transport theory which
includes anomalous velocity and side jump contributions and microscopic
Kubo-Streda perturbation theory, with particular unconventional contributions
in the semiclassical theory identified with particular Feynman diagrams when
calculations are carried out in a band-eigenstate representation. The
equivalence we establish is verified by explcit calculations for the case of
the two-dimensional (2D) Dirac model Hamiltonian relevant to graphene.Comment: 17 pages, 13 figure
Crystal structure, superconductivity and magnetic properties of the superconducting ferromagnets Gd1.4-xDyxCe0.6Sr2RuCu2O10 (x=0 - 0.6)
The structural, electrical and magnetic properties of the superconducting
ferromagnets, Gd1.4-xDyxCe0.6Sr2RuCu2O10 (x=0-0.6) are systematically
investigated as a function of Dy doping and temperature. These compounds are
characterised by high temperature superconductivity (Tc ranging from 20-40 K
depending upon the Dy content) coexisting with weak ferromagnetism with two
magnetic transitions (TM2 ranging from 95-106 K and TM1 around 120 K). Doping
with Dy gives no significant structural changes except for a minor change in
the c/a ratio. However the superconducting transition temperature is
significantly suppressed and magnetic ordering temperature enhanced on Dy
doping. These effects are described and discussed.Comment: 21 pages, 6 figures, 1 tabl
First-pass magnetic resonance imaging myocardial perfusion can determine microvascular dysfunction in acute myocardial infarction: Validation against angiographic thrombolysis in myocardial infarction frame count and myocardial blush score
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