4,384 research outputs found
Tuning Electrical Conductivity of CNT-PDMS Nanocomposites for Flexible Electronic Applications
This paper presents a study into the electrical conductivity of multi-wall carbon nanotube-polydimethylsiloxane (MWNT-PDMS) nanocomposite and their dependence on the filler concentration. It is observed that the electrical conductivity of the composites can be tailored by altering the filler concentration. Accordingly, the nanocomposites with filler weight ratio ranging from 1% to 8% were prepared and tested. Finally, the significance of results presented here for flexible pressure sensors and stretchable interconnects for electronic skin applications have been discussed
Pairing reentrance in hot rotating nuclei
The pairing gaps, heat capacities and level densities are calculated within
the BCS-based quasiparticle approach including the effect of thermal
fluctuations on the pairing field within the pairing model plus noncollective
rotation along the z axis for Ni and Ge nuclei. The analysis of
the numerical results obtained shows that, in addition to the pairing gap, the
heat capacity can also serve as a good observable to detect the appearance of
the pairing reentrance in hot rotating nuclei, whereas such signature in the
level density is rather weak.Comment: 19 pages, 4 figures, accepted in Phys. Rev.
A path planning control for a vessel dynamic positioning system based on robust adaptive fuzzy strategy
The thrusters and propulsion propellers systems, as well as the operating situations, are all well-known nonlinearities which are caused less accuracy of the dynamic positioning system (DPS) of vessels in the path planning control process. In this study, to enhance the robust performance of the DPS, we proposed a robust adaptive fuzzy control model to reduce the effect of uncertainty problems and disturbances on the DPS. Firstly, the adaptive fuzzy controller with adaptive law is designed to adjust the membership function of the fuzzy controller to minimize the error in path planning control of the vessel. Secondly, the H∞ performance of robust tracking is proved by the Lyapunov theory. Moreover, compared to the other controller, a simulation experiment comprising two case studies confirmed the efficiency of the approach. Finally, the results showed that the proposed controller reaches control quality, performance and stability
measures on compact Riemannian -manifolds
We construct the measure on an arbitrary 3-dimensional compact
Riemannian manifold without boundary as an invariant probability measure of a
singular stochastic partial differential equation. Proving the nontriviality
and the covariance under Riemannian isometries of that measure gives for the
first time a non-perturbative, non-topological interacting Euclidean quantum
field theory on curved spaces in dimension 3. This answers a longstanding open
problem of constructive quantum field theory on curved 3 dimensional
backgrounds. To control analytically several Feynman diagrams appearing in the
construction of a number of random fields, we introduce a novel approach of
renormalization using microlocal and harmonic analysis. This allows to obtain a
renormalized equation which involves some universal constants independent of
the manifold. We also define a new vectorial Cole-Hopf transform which allows
to deal with the vectorial model where is now a bundle valued
random field. In a companion paper, we develop in a self-contained way all the
tools from paradifferential and microlocal analysis that we use to build in our
manifold setting a number of analytic and probabilistic objects.Comment: references added, Section 6.2 adde
Global harmonic analysis for on closed Riemannian manifolds
Following Parisi \& Wu's paradigm of stochastic quantization, we constructed
in \cite{BDFT} a measure on an arbitrary compact, boundaryless,
Riemannian manifold as an invariant measure of a singular stochastic partial
differential equation. The present work is a companion to \cite{BDFT}. We
describe here in detail the harmonic and microlocal analysis tools that we
used. We also introduce some new tools to treat the vectorial model.
This relies on a new Cole-Hopf transform involving random bundle maps. We do
not aim here for the greatest generality; rather, we tried to keep our
exposition relatively self-contained and pedagogical enough in the hope that
the techniques we show can be used in other settings.Comment: 62 page
The software for oceanographic data management: VODC for PC 2.0
To manage and process a large amount of oceanographic data, users must have powerful tools that simplify these tasks. The VODC for PC is software designed to assist in managing oceanographic data. It based on 32 bits Windows operation system and used Microsoft Access database management system. With VODC for PC users can update data simply, convert to some international data formats, combine some VODC databases to one, calculate average, min, max fields for some types of data, check for valid data
Quantum magnetism and counterflow supersolidity of up-down bosonic dipoles
We study a gas of dipolar Bosons confined in a two-dimensional optical
lattice. Dipoles are considered to point freely in both up and down directions
perpendicular to the lattice plane. This results in a nearest neighbor
repulsive (attractive) interaction for aligned (anti-aligned) dipoles. We find
regions of parameters where the ground state of the system exhibits insulating
phases with ferromagnetic or anti-ferromagnetic ordering, as well as with
rational values of the average magnetization. Evidence for the existence of a
novel counterflow supersolid quantum phase is also presented.Comment: 8 pages, 6 figure
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