2,467 research outputs found
Myoelectric Knee Angle Estimation Algorithms for Control of Active Transfemoral Leg Prostheses
Symbolic powers of monomial ideals and Cohen-Macaulay vertex-weighted digraphs
In this paper we study irreducible representations and symbolic Rees algebras
of monomial ideals. Then we examine edge ideals associated to vertex-weighted
oriented graphs. These are digraphs having no oriented cycles of length two
with weights on the vertices. For a monomial ideal with no embedded primes we
classify the normality of its symbolic Rees algebra in terms of its primary
components. If the primary components of a monomial ideal are normal, we
present a simple procedure to compute its symbolic Rees algebra using Hilbert
bases, and give necessary and sufficient conditions for the equality between
its ordinary and symbolic powers. We give an effective characterization of the
Cohen--Macaulay vertex-weighted oriented forests. For edge ideals of transitive
weighted oriented graphs we show that Alexander duality holds. It is shown that
edge ideals of weighted acyclic tournaments are Cohen--Macaulay and satisfy
Alexander dualityComment: Special volume dedicated to Professor Antonio Campillo, Springer, to
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The Forage Selection Program at the Cerrados Research Center--33 Years of Contributions for the Tropics
Epidemiology of Salmonella in two different finishing swine barns in Brazil
Many finishing barns in Brazil have lamina d\u27agua , a continuous water flow at the back of solid-floored adjacent pens. Prevalence of Salmonella shedding and environmental contamination in finishing barns with lamina d\u27agua and without it were assessed through a cross sectional study conducted in 6 farms. No difference was found between the two systems. Sixteen Salmonella strains were isolated from 4 farms, comprising 6 serotypes: S. Agona, S. Typhimurium, S. Senftenberg, S. Sandiego, S. Rissen and S. Javiana. Serotypes varied among farms and differed from those recently identified in Brazil. Epidemiology of salmonella in swine farms is complex and might vary between farms or even between barns in a same farm
Antimicrobial resistance patterns of Salmonella isolated from finishing pigs and environmental samples
The aim of this study was to determine the antimicrobial resistance patterns of Salmonella isolates from pigs and environmental samples collected from modern swine facilities in Brazil. Sixteen samples from a total of 1,026 were positive to Salmonella and six serotypes were identified: Salmonella Typhimurium (1), Salmonella Agona (5), Salmonella Sandiego (4), Salmonella Rissen (1), Salmonella Senftenberg ( 4) and Salmonella Javiana (I). Resistance patterns were different among serotypes, but different isolates from a single serotype had the same antimicrobial pattern. The highest percentage of resistance was to tetracycline (100%), streptomycin (100%), nalidixic acid (100%), cefotaxime (12.5) and tobramycin ( 12.5). All serotypes were I 00% susceptible to ceftriaxone, norfloxacin, ciprofloxacin, ampicillin, gentamycin and chloramphenicol. Intermediate resistance to neomycin (93.5%), amikacin (12.5%) and trimethoprim (12.5%) was seen. The high resistance to tetracycline and streptomycin may be due to its extensive use in pig production
Potencial genético da aveia, como produtora de grãos no sul do Brasil
Yield and other agronomic traits were studied in six experiments with oats (Avena sativa L.) established in the Southern Brazil, during the years 1982 to 1984. The grain yield and hectoliter wight in different genotypes showed high progress; however, plant stature and heading time did not change in the last three years. The results suggest that plant breeding programmes should release new genotypes to increase stability and yield potential. O rendimento de grĂŁos e outros caracteres de importĂąncia agronĂŽmica foram estudados em seis experimentos de aveia estabelecidos na regiĂŁo sul do Brasil, entre os anos de 1982 a 1984. O rendimento de grĂŁos e o peso do hectolitro nos diferentes genĂłtipos demonstraram um alto progresso; entretanto, a estatura e o ciclo de desenvolvimento de planta nĂŁo apresentaram alteraçÔes nos Ășltimos trĂȘs anos. Os resultados sugerem que os programas de melhoramento devem continuar criando e testando novos genĂłtipos anualmente, com o objetivo de incrementar a estabilidade e o potencial de rendimento de grĂŁos.
Differential branching fraction and angular analysis of the decay B0âKâ0ÎŒ+ÎŒâ
The angular distribution and differential branching fraction of the decay B 0â K â0 ÎŒ + ÎŒ â are studied using a data sample, collected by the LHCb experiment in pp collisions at sâ=7 TeV, corresponding to an integrated luminosity of 1.0 fbâ1. Several angular observables are measured in bins of the dimuon invariant mass squared, q 2. A first measurement of the zero-crossing point of the forward-backward asymmetry of the dimuon system is also presented. The zero-crossing point is measured to be q20=4.9±0.9GeV2/c4 , where the uncertainty is the sum of statistical and systematic uncertainties. The results are consistent with the Standard Model predictions
Measurement of the relative rate of prompt Ïc0, Ïc1 and Ïc2 production at âs=7TeV
Prompt production of charmonium Ïc0, Ïc1 and Ïc2 mesons is studied using proton-proton collisions at the LHC at a centre-of-mass energy of âs=7TeV. The Ïc mesons are identified through their decay to J/ÏÎł, with J/ÏâÎŒ+muâ using photons that converted in the detector. A data sample, corresponding to an integrated luminosity of 1.0fbâ1 collected by the LHCb detector, is used to measure the relative prompt production rate of Ïc1 and Ïc2 in the rapidity range 2.0<y<4.5 as a function of the J/Ï transverse momentum from 3 to 20 GeV/c. First evidence for Ïc0 meson production at a hadron collider is also presented
Observation of the decay
The decay is observed for the first
time, using proton-proton collisions collected with the LHCb detector
corresponding to an integrated luminosity of 3fb. A signal yield of
decays is reported with a significance of 6.2 standard deviations.
The ratio of the branching fraction of \B_c \rightarrow J/\psi K^+ K^- \pi^+
decays to that of decays is measured to be
, where the first uncertainty is statistical and the
second is systematic.Comment: 18 pages, 2 figure
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