130 research outputs found
Análise das possibilidades e tendências do uso das tecnologias da informação e comunicação em agricultura de precisão.
Probability densities for the sums of iterates of the sine-circle map in the vicinity of the quasi-periodic edge of chaos
We investigate the probability density of rescaled sum of iterates of
sine-circle map within quasi-periodic route to chaos. When the dynamical system
is strongly mixing (i.e., ergodic), standard Central Limit Theorem (CLT) is
expected to be valid, but at the edge of chaos where iterates have strong
correlations, the standard CLT is not necessarily to be valid anymore. We
discuss here the main characteristics of the central limit behavior of
deterministic dynamical systems which exhibit quasi-periodic route to chaos. At
the golden-mean onset of chaos for the sine-circle map, we numerically verify
that the probability density appears to converge to a q-Gaussian with q<1 as
the golden mean value is approached.Comment: 7 pages, 7 figures, 1 tabl
Strictly and asymptotically scale-invariant probabilistic models of correlated binary random variables having {\em q}--Gaussians as limiting distributions
In order to physically enlighten the relationship between {\it
--independence} and {\it scale-invariance}, we introduce three types of
asymptotically scale-invariant probabilistic models with binary random
variables, namely (i) a family, characterized by an index ,
unifying the Leibnitz triangle () and the case of independent variables
(); (ii) two slightly different discretizations of
--Gaussians; (iii) a special family, characterized by the parameter ,
which generalizes the usual case of independent variables (recovered for
). Models (i) and (iii) are in fact strictly scale-invariant. For
models (i), we analytically show that the probability
distribution is a --Gaussian with . Models (ii) approach
--Gaussians by construction, and we numerically show that they do so with
asymptotic scale-invariance. Models (iii), like two other strictly
scale-invariant models recently discussed by Hilhorst and Schehr (2007),
approach instead limiting distributions which are {\it not} --Gaussians. The
scenario which emerges is that asymptotic (or even strict) scale-invariance is
not sufficient but it might be necessary for having strict (or asymptotic)
--independence, which, in turn, mandates --Gaussian attractors.Comment: The present version is accepted for publication in JSTA
Basilic Vein Transposition: improvement of the surgical technique
Introdução: O aumento crescente da população em hemodiálise tem implicado o recurso a acessos vasculares de maior complexidade
técnica.
A introdução de modificações na técnica cirúrgica da transposição da veia basílica (TVB) pretende agilizar o procedimento e diminuir a sua morbilidade.
Métodos: Análise prospectiva das TVB efectuadas no CHP-HSA entre Setembro de 2005 e Setembro de 2009.
Resultados: Efectuaram-se 74 TVB em 74 doentes, os quais tinham,em média, 2 acessos autólogos prévios. A TVB foi o primeiro
acesso em 20,3% dos doentes. O intervalo médio de seguimento foi de 14,5 meses.
Ocorreram 2 falências nos primeiros 30 dias. A taxa de patência secundária aos 3, 12 e 24 meses foi de 95,7%, 85,1% e 62,2%,
respectivamente. A Diabetes associou-se a pior taxa de patência(p=0,018).
A taxa de complicações perioperatórias foi de 28,4%, sendo a infecção a mais frequente (n=6, 8,1% do total de TVB). A trombose foi a principal causa de falência, tendo ocorrido em 24,3% de todas as TVB.
Conclusões: Reconhece-se a superioridade do acesso autólogo, como a melhor opção de acesso vascular para hemodiálise. A TVB é subutilizada, devido às exigências técnicas e necessidades logísticas.
Melhoramos a técnica cirúrgica e de tunelização, ao reduzir o tamanho das incisões e o tempo cirúrgico. Os nossos resultados revelaram uma boa patência a longo prazo, pelo que consideramos que deve
ser mais utilizada
Circle grid fractal plate as a turbulent generator for premixed flame: an overview
This review paper focuses to ascertain a new approach in turbulence generation on the structure of premixed flames and external combustion using a fractal grid pattern. This review paper discusses the relationship between fractal pattern and turbulence flow. Many researchers have explored the fractal pattern as a new concept of turbulence generators, but researchers rarely study fractal turbulence generators on the structure premixed flame. The turbulent flow field characteristics have been studied tand investigated in a premixed combustion application. In terms of turbulence intensity, most researchers used fractal grid that can be tailored so that they can design the characteristic needed in premixed flame. This approach makes it extremely difficult to determine the exact turbulent burning velocity on the velocity fluctuation of the flow. The decision to carry out additional research on the effect circle grid fractal plate as a turbulent generator for premixed flame should depends on the blockage ratio and fractal pattern of the grid.
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Versionamento de banco de dados com a ferramenta Liquibase: aplicação ao módulo web do Sistema de Informação de Experimentos da Embrapa (SIExp).
Este trabalho apresenta a ferramenta Liquibase para automação do processo de gestão de configuração de objetos relacionados à construção de bancos de dados.bitstream/item/138111/1/ComTec118.pd
Income and Poverty in a Developing Economy
We present a stochastic agent-based model for the distribution of personal
incomes in a developing economy. We start with the assumption that incomes are
determined both by individual labour and by stochastic effects of trading and
investment. The income from personal effort alone is distributed about a mean,
while the income from trade, which may be positive or negative, is proportional
to the trader's income. These assumptions lead to a Langevin model with
multiplicative noise, from which we derive a Fokker-Planck (FP) equation for
the income probability density function (IPDF) and its variation in time. We
find that high earners have a power-law income distribution while the low
income groups have a Levy IPDF. Comparing our analysis with the Indian survey
data (obtained from the world bank website) taken over many years we obtain a
near-perfect data collapse onto our model's equilibrium IPDF. The theory
quantifies the economic notion of "given other things". Using survey data to
relate the IPDF to actual food consumption we define a poverty index, which is
consistent with traditional indices, but independent of an arbitrarily chosen
"poverty line" and therefore less susceptible to manipulation
Scale relativity and fractal space-time: theory and applications
In the first part of this contribution, we review the development of the
theory of scale relativity and its geometric framework constructed in terms of
a fractal and nondifferentiable continuous space-time. This theory leads (i) to
a generalization of possible physically relevant fractal laws, written as
partial differential equation acting in the space of scales, and (ii) to a new
geometric foundation of quantum mechanics and gauge field theories and their
possible generalisations. In the second part, we discuss some examples of
application of the theory to various sciences, in particular in cases when the
theoretical predictions have been validated by new or updated observational and
experimental data. This includes predictions in physics and cosmology (value of
the QCD coupling and of the cosmological constant), to astrophysics and
gravitational structure formation (distances of extrasolar planets to their
stars, of Kuiper belt objects, value of solar and solar-like star cycles), to
sciences of life (log-periodic law for species punctuated evolution, human
development and society evolution), to Earth sciences (log-periodic
deceleration of the rate of California earthquakes and of Sichuan earthquake
replicas, critical law for the arctic sea ice extent) and tentative
applications to system biology.Comment: 63 pages, 14 figures. In : First International Conference on the
Evolution and Development of the Universe,8th - 9th October 2008, Paris,
Franc
Scans for signatures of selection in Russian cattle breed genomes reveal new candidate genes for environmental adaptation and acclimation
Domestication and selective breeding has resulted in over 1000 extant cattle breeds. Many of these breeds do not excel in important traits but are adapted to local environments. These adaptations are a valuable source of genetic material for efforts to improve commercial breeds. As a step toward this goal we identified candidate regions to be under selection in genomes of nine Russian native cattle breeds adapted to survive in harsh climates. After comparing our data to other breeds of European and Asian origins we found known and novel candidate genes that could potentially be related to domestication, economically important traits and environmental adaptations in cattle. The Russian cattle breed genomes contained regions under putative selection with genes that may be related to adaptations to harsh environments (e.g., AQP5, RAD50, and RETREG1). We found genomic signatures of selective sweeps near key genes related to economically important traits, such as the milk production (e.g., DGAT1, ABCG2), growth (e.g., XKR4), and reproduction (e.g., CSF2). Our data point to candidate genes which should be included in future studies attempting to identify genes to improve the extant breeds and facilitate generation of commercial breeds that fit better into the environments of Russia and other countries with similar climates
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