1,276 research outputs found
Hydraulic fluid interaction servovalve
Fluidic vortex valves used as fluid control elements in hydraulic servoactuator control syste
Singularities of the renormalization group flow for random elastic manifolds
We consider the singularities of the zero temperature renormalization group
flow for random elastic manifolds. When starting from small scales, this flow
goes through two particular points and , where the average value
of the random squared potential turnes negative ($l^{*}$) and where
the fourth derivative of the potential correlator becomes infinite at the
origin ($l_{c}$). The latter point sets the scale where simple perturbation
theory breaks down as a consequence of the competition between many metastable
states. We show that under physically well defined circumstances $l_{c} to negative values does not
take place.Comment: RevTeX, 3 page
Instanton classical solutions of SU(3) fixed point actions on open lattices
We construct instanton-like classical solutions of the fixed point action of
a suitable renormalization group transformation for the SU(3) lattice gauge
theory. The problem of the non-existence of one-instantons on a lattice with
periodic boundary conditions is circumvented by working on open lattices. We
consider instanton solutions for values of the size (0.6-1.9 in lattice units)
which are relevant when studying the SU(3) topology on coarse lattices using
fixed point actions. We show how these instanton configurations on open
lattices can be taken into account when determining a few-couplings
parametrization of the fixed point action.Comment: 23 pages, LaTeX, 4 eps figures, epsfig.sty; some comments adde
Density of States and Critical Behavior of the Coulomb Glass
We present zero-temperature simulations for the single-particle density of
states of the Coulomb glass. Our results in three dimensions are consistent
with the Efros and Shklovskii prediction for the density of states.
Finite-temperature Monte Carlo simulations show no sign of a thermodynamic
glass transition down to low temperatures, in disagreement with mean-field
theory. Furthermore, the random-displacement formulation of the model undergoes
a transition into a distorted Wigner crystal for a surprisingly broad range of
the disorder strength.Comment: 4 pages, 2 figures, 1 tabl
Zeeman and Orbital Limiting Fields: Separated Spin and Charge Degrees of Freedom in Cuprate Superconductors
Recent in-plane thermal (Nernst) and interlayer (tunnelling) transport
experiments in BiSrCaCuO high temperature superconductors
report hugely different limiting magnetic fields. Based on pairing (and the
uncertainty principle) combined with the definitions of the Zeeman energy and
the magnetic length, we show that in the underdoped regime both fields convert
to the same (normal state) pseudogap energy scale upon transformation as
orbital and spin (Zeeman) critical fields, respectively. We reconcile these
seemingly disparate findings invoking separated spin and charge degrees of
freedom residing in different regions of a truncated Fermi surface.Comment: 4 pages, 3 figures; accepted for publication in Phys. Rev. B (Rapid
Comm.
Research and development of a vortex valve for flow modulation of a 16-percent aluminized 5500 deg F propellant gas
Vortex valve for hot gas flow modulation in secondary injection thrust vector control syste
Research and development of a vortex valve controlled hot gas /5500 deg F/ secondary injection thrust vector control system
Performance of vortex valve controlled secondary injection thrust vector system for solid propellant rocket motor contro
Commensurate-incommensurate transition of cold atoms in an optical lattice
An atomic gas subject to a commensurate periodic potential generated by an
optical lattice undergoes a superfluid--Mott insulator transition. Confining a
strongly interacting gas to one dimension generates an instability where an
arbitrary weak potential is sufficient to pin the atoms into the Mott state;
here, we derive the corresponding phase diagram. The commensurate pinned state
may be detected via its finite excitation gap and the Bragg peaks in the static
structure factor.Comment: 4 pages, 2 figure
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