Systematic limits on sin^2{2theta_{13}} in neutrino oscillation experiments with multi-reactors

Sensitivities to sin^2{2theta_{13}} without statistical errors (``systematic limit'') are investigated in neutrino oscillation experiments with multiple reactors. Using an analytical approach, we show that the systematic limit on sin^2{2theta_{13}} is dominated by the uncorrelated systematic error sigma_u of the detector. Even in an experiment with multi-detectors and multi-reactors, it turns out that most of the systematic errors including the one due to the nature of multiple sources is canceled as in the case with a single reactor plus two detectors, if the near detectors are placed suitably. The case of the KASKA plan (7 reactors and 3 detectors) is investigated in detail, and it is explicitly shown that it does not suffer from the extra uncertainty due to multiple reactors.Comment: 26 pages, 10 eps-files, revtex

Electrodynamic trapping of spinless neutral atoms with an atom chip

Three dimensional electrodynamic trapping of neutral atoms has been demonstrated. By applying time-varying inhomogeneous electric fields with micron-sized electrodes, nearly $10^2$ strontium atoms in the $^1S_0$ state have been trapped with a lifetime of 80 ms. In order to design the electrodes, we numerically analyzed the electric field and simulated atomic trajectories in the trap, which showed reasonable agreement with the experiment.Comment: 4pages, 4figures, to appear in Phys. Rev. Let

Spontaneous alloying in binary metal microclusters - A molecular dynamics study -

Microcanonical molecular dynamics study of the spontaneous alloying(SA), which is a manifestation of fast atomic diffusion in a nano-sized metal cluster, is done in terms of a simple two dimensional binary Morse model. Important features observed by Yasuda and Mori are well reproduced in our simulation. The temperature dependence and size dependence of the SA phenomena are extensively explored by examining long time dynamics. The dominant role of negative heat of solution in completing the SA is also discussed. We point out that a presence of melting surface induces the diffusion of core atoms even if they are solid-like. In other words, the {\it surface melting} at substantially low temperature plays a key role in attaining the SA.Comment: 15 pages, 12 fgures, Submitted to Phys.Rev.

GPS signal acquisition and tracking using software GPS receiver

In this paper we investigate GPS signal acquisition and tracking using software GPS receiver. The software GPS receiver consists of a RF front-end, an ADC, and a software GPS program that runs on PC. The RF front-end down-converts the signal from RF to IF, and the ADC samples the IF signal. All the other processing including signal acquisition, tracking, data decoding, and solving position are all implemented in software using signal processing techniques. The local C/A code and carrier replica signals are pre-generated, stored in memory, and used repetitively during signal acquisition and tracking. The concepts of signal processing using software GPS receiver can be applied to the next generation Global Navigation Satellite System and Space Based Augmentation System receivers design

Neel Temperature of Quasi-Low-Dimensional Heisenberg Antiferromagnets

The N\'eel temperature, $T_{\rm N}$, of quasi-one- and quasi-two-dimensional antiferromagnetic Heisenberg models on a cubic lattice is calculated by Monte Carlo simulations as a function of inter-chain (inter-layer) to intra-chain (intra-layer) coupling $J'/J$ down to $J'/J\simeq 10^{-3}$. We find that $T_{\rm N}$ obeys a modified random-phase approximation-like relation for small $J'/J$ with an effective universal renormalized coordination number, independent of the size of the spin. Empirical formulae describing $T_{\rm N}$ for a wide range of $J'$ and useful for the analysis of experimental measurements are presented.Comment: 4 pages, 4 figures, to be published in Phys. Rev. Let

Proposta de utilização de mineração de textos para análise e priorização de genes candidatos de interesse para a agricultura.

RESUMO: Neste artigo é apresentado um projeto para utilização de técnicas de mineração de textos para análise e priorização de genes candidatos em experimentos de varredura genômica, visando a inclusão de novos genes em programas de melhoramento animal e vegetal. Embora no presente estágio do projeto, os resultados ainda sejam preliminares, é apresentado um experimento que demonstra como a descrição da função biológica de genes pode ser capturada a partir de textos que descrevem sua função biológica, que é o primeiro passo no sentido de comparar genes funcionalmente, visando priorizá-los segundo um critério específico.SBIAgro 2011