19,115 research outputs found
An in-host model of HIV incorporating latent infection and viral mutation
We construct a seven-component model of the in-host dynamics of the Human
Immunodeficiency Virus Type-1 (i.e, HIV) that accounts for latent infection and
the propensity of viral mutation. A dynamical analysis is conducted and a
theorem is presented which characterizes the long time behavior of the model.
Finally, we study the effects of an antiretroviral drug and treatment
implications.Comment: 10 pages, 7 figures, Proceedings of AIMS Conference on Differential
Equations and Dynamical Systems (2015
Replica study of pinned bubble crystals
In higher Landau levels (), the ground state of the two-dimensional
electron gas in a strong perpendicular magnetic field evolves from a Wigner
crystal for small filling of the partially filled Landau level, into a
succession of bubble states with increasing number of guiding centers per
bubble as increases, to a modulated stripe state near . In
this work, we compute the frequency-dependent longitudinal conductivity of the Wigner and bubble crystal states in the presence
of disorder. We apply an elastic theory to the crystal states which is
characterized by a shear and a bulk modulus. We obtain both moduli from the
microscopic time-dependent Hartree-Fock approximation. We then use the replica
and Gaussian variational methods to handle the effects of disorder. Within the
semiclassical approximation we get the dynamical conductivity as well as the
pinning frequency as functions of the Landau level filling factor and compare
our results with recent microwave experiments.Comment: 19 pages and 6 eps figure
Heavy baryon spectroscopy in QCD
We perform a systematic study of the masses of charmed and bottom baryons in
the framework of the QCD sum rule approach. Contributions of the operators up
to dimension six are included in operator product expansion. The resulting
heavy baryon masses from the calculations are well consistent with the
experimental values, and predictions to the spectroscopy of the unobserved
bottom baryons are also presented.Comment: 14 pages,38 figure
Electromechanical Simulation of Actively Controlled Rotordynamic Systems with Piezoelectric Actuators
Theories and tests for incorporating piezoelectric pushers as actuator devices for active vibration control are discussed. It started from a simple model with the assumption of ideal pusher characteristics and progressed to electromechanical models with nonideal pushers. Effects on system stability due to the nonideal characteristics of piezoelectric pushers and other elements in the control loop were investigated
Doubly heavy baryons in QCD sum rules
The mass spectra of doubly heavy baryons are systematically calculated in the
framework of QCD sum rules. With a tentative heavy-diquark--light-quark
configuration, the interpolating currents representing the doubly heavy baryons
are proposed. Contributions of the operators up to dimension six are included
in operator product expansion. The numerical results are compatible with other
theoretical predictions, which may support the structure of doubly
heavy baryons.Comment: RevTeX 4, 11 pages with 14 eps figures, accepted for publication in
Phys. Rev.
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