1,157,860 research outputs found
Development of Wearable Systems for Ubiquitous Healthcare Service Provisioning
This paper reports on the development of a wearable system using wireless
biomedical sensors for ubiquitous healthcare service provisioning. The
prototype system is developed to address current healthcare challenges such as
increasing cost of services, inability to access diverse services, low quality
services and increasing population of elderly as experienced globally. The
biomedical sensors proactively collect physiological data of remote patients to
recommend diagnostic services. The prototype system is designed to monitor
oxygen saturation level (SpO2), Heart Rate (HR), activity and location of the
elderly. Physiological data collected are uploaded to a Health Server (HS) via
GPRS/Internet for analysis.Comment: 6 pages, 3 figures, APCBEE Procedia 7, 2013. arXiv admin note:
substantial text overlap with arXiv:1309.154
Mechanical coupling for high cyclic loading
One-piece cylindrical coupling with ""necked-down'' regions at each end form flexures allowing small misalignments between actuator and load. Coupling has zero backlash, low mass, close spacing between actuator and load, high stiffness in direction of motion, and allowance for misalignments and deflections without causing high side loading on components
Renormalized energy of ground and first excited state of Fr\"{o}hlich polaron in the range of weak coupling
Partial summing of infinite range of diagrams for the two-phonon mass
operator of polaron described by Fr\"{o}hlich Hamiltonian is performed using
the Feynman-Pines diagram technique. Renormalized spectral parameters of ground
and first excited (phonon repeat) polaron state are accurately calculated for a
weak electron-phonon coupling at K. It is shown that the stronger
electron-phonon interaction shifts the energy of both states into low-energy
region of the spectra. The ground state stays stationary and the excited one
decays at a bigger coupling constant.Comment: 12 pages, 5 figure
The Jackiw-Pi model and its symmetries
The non-Abelian gauge model proposed by Jackiw and Pi, which generates an
even-parity mass term in three space-time dimensions, is revisited in this
letter. All the symmetries of the model are collected and established by means
of BRS invariance and Slavnov-Taylor identity. The path for the perturbatively
quantization of the Jackiw-Pi model, through the algebraic method of
renormalization, is presented.Comment: 5 page
Effect of ionic ordering in conductivity experiments of DNA aqueous solutions
The effects of ionic ordering in DNA water solutions are studied by
conductivity experiments. The conductivity measurements are performed for the
solutions of DNA with KCl salt in the temperature range from 28 to 70 C. Salt
concentration vary from 0 to 2 M. The conductivity of solutions without DNA but
with the same concentration of KCl salt are also performed. The results show
that in case of salt free solution of DNA the melting process of the double
helix is observed, while in case of DNA solution with added salt the
macromolecule denaturation is not featured. For salt concentrations lower than
some critical one (0.4 M) the conductivity of DNA solution is higher than the
conductivity of KCl water solution without DNA. Starting from the critical
concentration the conductivity of KCl solution is higher than the conductivity
of DNA solution with added salt. For description of the experimental data
phenomenological model is elaborated basing on electrolyte theory. In framework
of the developed model a mechanism of counterion ordering is introduced.
According to this mechanism under the low salt concentrations electrical
conductivity of the system is caused by counterions of DNA ion-hydrate shell.
Increasing the amount of salt to the critical concentration counterions
condense on DNA polyanion. Further increase of salt concentration leads to the
formation of DNA-salt complexes that decreases the conductivity of the system.Comment: 12 pages, 6figures. Ukr. J. Phys. (2014
Energy spectrum of localized quasiparticles renormalized by multi-phonon processes at finite temperature
The theory of renormalized energy spectrum of localized quasi-particle
interacting with polarization phonons at finite temperature is developed within
the Feynman-Pines diagram technique. The created computer program effectively
takes into account multi-phonon processes, exactly defining all diagrams of
mass operator together with their analytical expressions in arbitrary order
over the coupling constant. Now it is possible to separate the pole and
non-pole mass operator terms and perform a partial summing of their main terms.
The renormalized spectrum of the system is obtained within the solution of
dispersion equation in the vicinity of the main state where the high- and
low-energy complexes of bound states are observed. The properties of the
spectrum are analyzed depending on the coupling constant and the temperature.Comment: 16 pages, 3 figures, 3 table
A Note on Semidensities in Antisymplectic Geometry
We revisit Khudaverdian's geometric construction of an odd nilpotent operator
\Delta_E that sends semidensities to semidensities on an antisymplectic
manifold. We find a local formula for the \Delta_E operator in arbitrary
coordinates and we discuss its connection to Batalin-Vilkovisky quantization.Comment: 11 pages, LaTeX. v2: Added eqs. (4.1), (6.3), (6.4) & (6.5). v3: Sec.
6 expanded and ref. added. v4: Included a proof of the main statement in the
appendices. v5: Flipped the sign convention for \nu^{(2)}. v6: Stylistic
change
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