Quaero@H1: An Interface to High-pT HERA Event Data

Distributions from high-pT HERA event data analyzed in a general search for new physics at H1 have been incorporated into Quaero, an algorithm designed to automate tests of specific hypotheses with high energy collider data. The use of Quaero@H1 to search for leptoquarks, R-parity violating supersymmetry, and excited quarks provides examples to develop intuition for the algorithm's performance.Comment: Submitted to Eur. Phys. J.

Stochastic stability for a model representing the intake manifold pressure of an automotive engine

The paper presents conditions to assure stochastic stability for a nonlinear model. The proposed model is used to represent the input-output dynamics of the angle of aperture of the throttle valve (input) and the manifold absolute pressure (output) in an automotive spark-ignition engine. The automotive model is second moment stable, as stated by the theoretical result—data collected from real-time experiments supports this finding.Peer ReviewedPostprint (author's final draft

An Analysis of Four-quark Energies in SU(2) Lattice Monte Carlo using the Flux-tube Symmetry:

Energies of four-quark systems calculated by the static quenched SU(2) lattice Monte Carlo method are analyzed in $2\times 2$ bases for square, rectangle, tilted rectangle, linear and quadrilateral geometry configurations and in $3\times 3$ bases for a non-planar geometry configuration. For small interquark distances, a lattice effect is taken into account by considering perimeter dependent terms which are characterized by the cubic symmetry. It is then found that a parameter $f$ - that can be identified as a gluon field overlap factor - is rather well described by the form $exp(-[b_sE{\cal A}+\sqrt{b_s}F{\cal P}])$, where ${\cal A}$ and ${\cal P}$ are the area and perimeter mainly defined by the positions of the four quarks, $b_s$ is the string constant in the 2-quark potentials and $E,F$ are constants.Comment: (19 pages of Latex - 1 page of figures not included - sent on request). Preprint HU-TFT-94-2

Monetary policy as a source of uncertainty

This paper proposes a model in which control variations induce an increase in the uncertainty of the system. The aim of our paper is to provide a stochastic theoretical model that can be used to explain under which uncertainty conditions monetary policy rules should be less or more aggressive, or, simply, applied or not.

Active swarms on a sphere

Here we show that coupling to curvature has profound effects on collective motion in active systems, leading to patterns not observed in flat space. Biological examples of such active motion in curved environments are numerous: curvature and tissue folding are crucial during gastrulation, epithelial and endothelial cells move on constantly growing, curved crypts and vili in the gut, and the mammalian corneal epithelium grows in a steady-state vortex pattern. On the physics side, droplets coated with actively driven microtubule bundles show active nematic patterns. We study a model of self-propelled particles with polar alignment on a sphere. Hallmarks of these motion patterns are a polar vortex and a circulating band arising due to the incompatibility between spherical topology and uniform motion - a consequence of the hairy ball theorem. We present analytical results showing that frustration due to curvature leads to stable elastic distortions storing energy in the band.Comment: 5 pages, 4 figures plus Supporting Informatio

Germinacao de sementes de leguminosas forrageiras nativas submetidas a tratamentos para a quebra da impermeabilidade do tegumento.

Foi testado o efeito de escarificacao com lixa, do tratamento com acido sulfurico (98o) durante l, 5, 10, 15 e 20 minutos e com agua quente (80oC) durante l, 5,10, 15 e 20 minutos sobre a germinacao das sementes das seguintes leguminosas forrageiras nativas: Stylosanthes capitata, Canavalia obtusifolia, Dioclea lasiophylla, Cratylia floribunda, Calopogonium velutinum e Desmanthus virgatus. O delineamento foi de blocos ao acaso, com tres repeticoes, com 50 sementes por repeticao. Em todas as especies testadas a percentagem de germinacao da testemunha (sem escarificacao) foi muito baixa (0 a 8% aos sete dias e 8 a 16% aos 30 dias) com excecao da C. floribunda (56 e 100% aos 7 e 30 dias). A escarificacao com lixa foi eficiente para S.capitata, C. obtusifolia, C.floribunda e C. velutinum. Os tratamentos com acido sulfurico durante 10, 15 e 20 minutos foram eficazes para D. virgatus (90 a 98% e 94 a 100% de germinacao aos 7 e aos 30 dias) e, durante 5, 10 e 15 minutos foram eficazes para C. floribunda (82 a 92% aos sete dias). Os tratamentos com agua quente so foram eficientes para C. obtusifolia (64 a 90% de germinacao aos 7 e 62 a 100% aos 30 dias). S. capitata teve as mais baixas percentagens de germinacao, em todos os tratamentos, tanto aos 7 como aos 30 dias. C. velutium e D. lasiophylla tiveram germinacao relativamente baixa aos 7 dias, porem bastante aumentada entre o setimo e o trigesimo dia.bitstream/item/40919/1/Bolp50001.pd