5,992 research outputs found
Large deviations for a random speed particle
We investigate large deviations for the empirical measure of the position and
momentum of a particle traveling in a box with hot walls. The particle travels
with uniform speed from left to right, until it hits the right boundary. Then
it is absorbed and re-emitted from the left boundary with a new random speed,
taken from an i.i.d. sequence. It turns out that this simple model, often used
to simulate a heat bath, displays unusually complex large deviations features,
that we explain in detail. In particular, if the tail of the update
distribution of the speed is sufficiently oscillating, then the empirical
measure does not satisfy a large deviations principle, and we exhibit optimal
lower and upper large deviations functionals
Layered double hydroxide-modified organic electrochemical transistor for glucose and lactate biosensing
open8noBiosensors based on Organic Electrochemical Transistors (OECTs) are developed for the selective detection of glucose and lactate. The transistor architecture provides signal amplification (gain) with respect to the simple amperometric response. The biosensors are based on a poly(3,4ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) channel and the gate electrode is functionalised with glucose oxidase (GOx) or lactate oxidase (LOx) enzymes, which are immobilised within a Ni/Al Layered Double Hydroxide (LDH) through a one-step electrodeposition procedure. The here-designed OECT architecture allows minimising the required amount of enzyme during electrodeposition. The output signal of the biosensor is the drain current (Id), which decreases as the analyte concentration increases. In the optimised conditions, the biosensor responds to glucose in the range of 0.1–8.0 mM with a limit of detection (LOD) of 0.02 mM. Two regimes of proportionality are observed. For concentrations lower than 1.0 mM, a linear response is obtained with a mean gain of 360, whereas for concentrations higher than 1.0 mM, Id is proportional to the logarithm of glucose concentration, with a gain of 220. For lactate detection, the biosensor response is linear in the whole concentration range (0.05–8.0 mM). A LOD of 0.04 mM is reached, with a net gain equal to 400.openGualandi I.; Tessarolo M.; Mariani F.; Arcangeli D.; Possanzini L.; Tonelli D.; Fraboni B.; Scavetta E.Gualandi I.; Tessarolo M.; Mariani F.; Arcangeli D.; Possanzini L.; Tonelli D.; Fraboni B.; Scavetta E
Quasi-potentials of the entropy functionals for scalar conservation laws
We investigate the quasi-potential problem for the entropy cost functionals
of non-entropic solutions to scalar conservation laws with smooth fluxes. We
prove that the quasi-potentials coincide with the integral of a suitable
Einstein entropy.Comment: 26 pages, 4 figure
Convergence of the one-dimensional Cahn-Hilliard equation
We consider the Cahn-Hilliard equation in one space dimension with scaling a
small parameter \epsilon and a non-convex potential W. In the limit \espilon
\to 0, under the assumption that the initial data are energetically
well-prepared, we show the convergence to a Stefan problem. The proof is based
on variational methods and exploits the gradient flow structure of the
Cahn-Hilliard equation.Comment: 23 page
A Renewal version of the Sanov theorem
Large deviations for the local time of a process are investigated,
where for and are i.i.d.\ random
variables on a Polish space, is the -th arrival time of a renewal
process depending on . No moment conditions are assumed on the arrival
times of the renewal process.Comment: 13 page
Large deviations of the current in stochastic collisional dynamics
We consider a class of deterministic local collisional dynamics, showing how
to approximate them by means of stochastic models and then studying the
fluctuations of the current of energy. We show first that the variance of the
time-integrated current is finite and related to the conductivity by the
Green-Kubo relation. Next we show that the law of the empirical average current
satisfies a large deviations principle and compute explicitly the rate
functional in a suitable scaling limit. We observe that this functional is not
strictly convex.Comment: keywords and references adde
Dirichlet's and Thomson's principles for non-selfadjoint elliptic operators with application to non-reversible metastable diffusion processes
We present two variational formulae for the capacity in the context of
non-selfadjoint elliptic operators. The minimizers of these variational
problems are expressed as solutions of boundary-value elliptic equations. We
use these principles to provide a sharp estimate for the transition times
between two different wells for non-reversible diffusion processes. This
estimate permits to describe the metastable behavior of the system
Strategi Pengembangan Industri Meubel Rotan Irma Jaya di Kota Palu
The purpose of this study was to analysis the strategy of “Irma Jaya Rattan Furniture”. SWOT was used to analyse the collected data. The results showed that Irma Jaya Rattan the development influenced by internal and external factors. Internal factors had a total value of 3.61 with scores of strength 2.59 and weakness 1.02, respectively. This shows the strength factor was greater than the weakness, while external factors have a total value of 2.61 with scores of opportunities 2.04 and threat 0.57, respectively. This showed that the opportunities factor was greater than the threat. Therefore the suitable alternative strategies for the development of Rattan Furniture Industry Irma Jaya is by using SO, Irma Jaya Rattan Furniture Industry can create a strategy that uses force to take advantage of existing opportunities
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