Intermittency on catalysts

The present paper provides an overview of results obtained in four recent papers by the authors. These papers address the problem of intermittency for the Parabolic Anderson Model in a \emph{time-dependent random medium}, describing the evolution of a ``reactant'' in the presence of a ``catalyst''. Three examples of catalysts are considered: (1) independent simple random walks; (2) symmetric exclusion process; (3) symmetric voter model. The focus is on the annealed Lyapunov exponents, i.e., the exponential growth rates of the successive moments of the reactant. It turns out that these exponents exhibit an interesting dependence on the dimension and on the diffusion constant.Comment: 11 pages, invited paper to appear in a Festschrift in honour of Heinrich von Weizs\"acker, on the occasion of his 60th birthday, to be published by Cambridge University Pres

Intermittency on catalysts: three-dimensional simple symmetric exclusion

We continue our study of intermittency for the parabolic Anderson model $\partial u/\partial t = \kappa\Delta u + \xi u$ in a space-time random medium $\xi$, where $\kappa$ is a positive diffusion constant, $\Delta$ is the lattice Laplacian on $\Z^d$, $d \geq 1$, and $\xi$ is a simple symmetric exclusion process on $\Z^d$ in Bernoulli equilibrium. This model describes the evolution of a \emph{reactant} $u$ under the influence of a \emph{catalyst} $\xi$. In G\"artner, den Hollander and Maillard (2007) we investigated the behavior of the annealed Lyapunov exponents, i.e., the exponential growth rates as $t\to\infty$ of the successive moments of the solution $u$. This led to an almost complete picture of intermittency as a function of $d$ and $\kappa$. In the present paper we finish our study by focussing on the asymptotics of the Lyaponov exponents as $\kappa\to\infty$ in the \emph{critical} dimension $d=3$, which was left open in G\"artner, den Hollander and Maillard (2007) and which is the most challenging. We show that, interestingly, this asymptotics is characterized not only by a \emph{Green} term, as in $d\geq 4$, but also by a \emph{polaron} term. The presence of the latter implies intermittency of \emph{all} orders above a finite threshold for $\kappa$.Comment: 38 page

Finding Employment for Individuals with Disabilities Utilizing Interprofessional Collaboration

This capstone is going to demonstrate my abilities to practice and apply all nine social work competencies. I will be conducting a case study on one of my clients that I have been able to assist during my time at my practicum placement. This capstone will begin by discussing my practicum placement and the agency\u27s goals. The capstone will then thoroughly examine each competency as I describe how I have been able to utilize interprofessional social work practice and skills while working with my client. Lastly, this capstone will discuss the case outcome and how the outcomes were evaluated by the agency

Separating Status from Power as an Antecedent of Intergroup Perception

Status and power covary such that higher status groups are typically higher power groups. This research explored the effect of status on intergroup perception controlling for power. Experiment 1 manipulated the relative status of social groups and explicitly provided the groups equal power. Experiment 2 manipulated status and power orthogonally. Multiple measures yielded consistent patterns indicating that status affected perceived group centrality and variability independent of power. The patterns were consistent with a strategic intergroup comparison account as suggested by social identity theory. Specifically, the effect of status on intergroup perception varied with the relevance and valence of the dimension of comparison in a manner that balanced social reality with a positive social identity

Experimental demonstration of four-party quantum secret sharing

Secret sharing is a multiparty cryptographic task in which some secret information is splitted into several pieces which are distributed among the participants such that only an authorized set of participants can reconstruct the original secret. Similar to quantum key distribution, in quantum secret sharing, the secrecy of the shared information relies not on computational assumptions, but on laws of quantum physics. Here, we present an experimental demonstration of four-party quantum secret sharing via the resource of four-photon entanglement

Measuring the Measures

We meta-analytically synthesized the intergroup variability literature (177 effect sizes, from 173 independent samples, and 12,078 participants) to test the potential moderating effect of 11 measures of perceived variability. Aggregating across the measures, we detected a small but reliable tendency to perceive more variability among ingroup than outgroup members and such outgroup homogeneity was stronger among non-minimal than minimal groups. Furthermore, analyses that distinguished among the 11 measures revealed systematic discrepancies among the patterns of perception detected by those measures. Those systematic discrepancies further varied across social contexts defined by relative group status, with some measures yielding ingroup homogeneity and others outgroup homogeneity. We discuss the possibility that the measures of variability require different mental activities that interact with contextually induced cognitive and motivational processes to yield disparate intergroup perceptions

Decoherence-Free Quantum Information Processing with Four-Photon Entangled States

Decoherence-free states protect quantum information from collective noise, the predominant cause of decoherence in current implementations of quantum communication and computation. Here we demonstrate that spontaneous parametric down-conversion can be used to generate four-photon states which enable the encoding of one qubit in a decoherence-free subspace. The immunity against noise is verified by quantum state tomography of the encoded qubit. We show that particular states of the encoded qubit can be distinguished by local measurements on the four photons only.Comment: 4 pages, 4 eps figures, revtex

A solid-reagent dispenser for use in the azocoll protease assay (and other insoluble substrate analyses).

A solid-reagent dispenser for use in the azocoll protease assay (and other insoluble substrate analyses)

Cosmic Background dipole measurements with Planck-High Frequency Instrument

This paper discusses the Cosmic Background (CB) dipoles observations in the framework of the Planck mission. Dipoles observations can be used in three ways: (i) It gives a measurement of the peculiar velocity of our Galaxy which is an important observation in large scale structures formation model. (ii) Measuring the dipole can give unprecedent information on the monopole (that can be in some cases hard to obtain due to large foreground contaminations). (iii) The dipole can be an ideal absolute calibrator, easily detectable in cosmological experiments. Following the last two objectives, the main goal of the work presented here is twofold. First, we study the accuracy of the Planck-HFI calibration using the Cosmic Microwave Background (CMB) dipole measured by COBE as well as the Earth orbital motion dipole. We show that we can reach for HFI, a relative calibration between rings of about 1% and an absolute calibration better than 0.4% for the CMB channels (in the end, the absolute calibration will be limited by the uncertainties on the CMB temperature). We also show that Planck will be able to measure the CMB dipole direction at better than 1.7 arcmin and improve on the amplitude. Second, we investigate the detection of the Cosmic Far-Infrared Background (FIRB) dipole. Measuring this dipole could give a new and independent determination of the FIRB for which a direct determination is quite difficult due to Galactic dust emission contamination. We show that such a detection would require a Galactic dust emission removal at better than 1%, which will be very hard to achieve.Comment: 10 pages, 13 figures, submitted to A&A, uses aa.sty V5.

Análise de nutrientes em mudas de Nó-de-Cachorro (Heteropterys aphrodisiaca O. Mach.) cultivadas em diferentes substratos.

A espécie Heteropterys aphrodisíaca O. Mach (Nó -de-cachorro) é tida como planta medicinal de grande importância devido as suas atribuições curativas de enfermidades. Contudo, a parte fitotécnica ainda é pouco estudada. O objetivo do trabalho foi analisar os teores de sódio (Na), potássio (K), fósforo (P), magnésio (Mg), cálcio (Ca), manganês (Mn), ferro (Fe), nitrogênio total (NT) e proteína bruta (PB) nas folhas de mudas de Heteropterys aphrodisíaca O. Mach sob quatro tipos de misturas (M) contendo diferentes proporções de terra e areia e duas profundidades (P) de semeadura.bitstream/CPAP/55781/1/BP72.pdfBoletim de Pesquisa e Desenvolvimento Formato Eletrônico