21,680 research outputs found
Fast gates for ion traps by splitting laser pulses
We present a fast phase gate scheme that is experimentally achievable and has an operation time more than two orders of magnitude faster than current experimental schemes for low numbers of pulses. The gate time improves with the number of pulses following an inverse power law. Unlike
implemented schemes which excite precise motional sidebands, thus limiting
the gate timescale, our scheme excites multiple motional states using discrete
ultra-fast pulses.We use beam-splitters to divide pulses into smaller components
to overcome limitations due to the finite laser pulse repetition rate. This provides
gate times faster than proposed theoretical schemes when we optimize a practical
setup
Comparative gene expression study to identify genes possibly related to storage root formation in cassava.
Influência da seca prolongada sobre a atividade enzimática e micorrizas em floresta de terra firme: resultados de um experimento de manipulação de chuvas.
Mecanismos ligados a ciclagem de nitrogênio e fósforo em área de pastagem abandonada na Amazônia Oriental: resultados de um experimento de fertilização.
Carbono e nitrogênio da biomassa microbiana em cronoseqüência de vegetação secundária no nordeste paraense.
Nonextensivity in the Solar Neighborhood
In the present study, we analyze the radial velocity distribution as a
function of different stellar parameters such as stellar age, mass, rotational
velocity and distance to the Sun for a sample of 6781 single low--mass field
dwarf stars, located in the solar neighborhood. We show that the radial
velocity distributions are best fitted by --Gaussians that arise within the
Tsallis nonextensive statistics. The obtained distributions cannot be described
by the standard Gaussian that emerges within Boltzmann-Gibbs (B--G) statistical
mechanics. The results point to the existence of a hierarchical structure in
phase space, in contrast to the uniformly occupied phase space of B--G
statistical mechanics, driven by the --Central Limit Theorem, consistent
with nonextensive statistical mechanics.Comment: 5 pages, 4 figures: EPL accepte
Pt2L4 protein, a homologue to Hev b 5 from rubber tree, may not be responsible for the cross-reactions to cassava show by peope allergic to latex.
Improved semiclassical density matrix: taming caustics
We present a simple method to deal with caustics in the semiclassical
approximation to the thermal density matrix of a particle moving on the line.
For simplicity, only its diagonal elements are considered. The only ingredient
we require is the knowledge of the extrema of the Euclidean action. The
procedure makes use of complex trajectories, and is applied to the quartic
double-well potential.Comment: 20 pages, 7 figures. Revised version, accepted for publication in
Phys. Rev.
Avaliação da produtividade de girassol semado em dezembro em Uruguaiana-RS.
Com o objetivo de avaliar a produtividade de girassol em Uruguaiana-RS, foi realizado um experimento com semeadura em dezembro de 2010, conduzido na área experimental da FEPAGRO Fronteira Oeste, com delineamento experimental em blocos casualizados com quatro repetições. Foram avaliados os genótipos: BRS 321, BRS 323, Helio 358 e M734. A produtividade média do experimento foi de 2.043 kg.ha-1 . Quanto a variável número de dias para maturação fisiológica (NDF) os genótipos apresentaram comportamentos distintos sendo o mais tardio o M734 com 102 dias e o mais precoce o BRS 321 com 84 dias. The objective of this study was to evaluate grain yield of sunflower at Uruguaiana-RS,in an experiment sowed in December of 2010. It was carried out at FEPAGRO Fronteira Oeste field, in completely randomized blocks, with four replications. The genotypes evaluated were: BRS 321, BRS 323, Helio 358 and M734. The average grain yield of experiment was 2.043 kg.ha. For the NDF (number of days for physiological maturity) the genotypes performed differently and the M734, with 102 days, was the later, and the BRS 321, with 84 days, was the earlier
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