7,210 research outputs found
The Geometry of Entanglement Sudden Death
In open quantum systems, entanglement can vanish faster than coherence. This
phenomenon is usually called sudden death of entanglement. In this paper sudden
death of entanglement is discussed from a geometrical point of view, in the
context of two qubits. A classification of possible scenarios is presented,
with important known examples classified. Theoretical and experimental
construction of other examples is suggested as well as large dimensional and
multipartite versions of the effect.Comment: 6 pages, 2 figures, references added, initial paragraph corrected,
sectioning adopted, some parts rewritten; accepted by New J. Phy
Development and validation of a method for the analysis of Ochratoxin A in roasted coffee by liquid chromatography/electrospray-mass spectrometry in Tandem (LC/ESI-MS/MS).
A method using LC/ESI-MS/MS for the quantitative analysis of Ochratoxin A in roasted coffee was described. Linearity was demonstrated (r = 0.9175). The limits of detection and quantification were 1.0 and 3.0 ng g-1, respectively. Trueness, repeatability and intermediate precision values were 89.0-108.8%; 2.4-13.7%; 12.5-17.8%, respectively. To the best of our knowledge, this is the first report in which Ochratoxin A in roasted coffee is analysed by LC/ESI-MS/MS, contributing to the field of mycotoxin analysis, and it will be used for future production of Certified Reference Material
THE RELATIONSHIPS BETWEEN SPRINT RUN AND STRENGTH PARAMETERS IN YOUNG ATHLETES AND NON-ATHLETES
The aim of this study was to examine the relationships between the sprint run and strength tests, which measure the capability to produce force in isometric, pure concentric and stretch shortening cycle muscular actions. The seventy two subjects were assessed for six tests 60m sprint run, to evaluate the speed, and isometric leg-press, squat jump,
countermovement jump, drop jump, and 5 horizontal jumps, to evaluate strength parameters. The 5 jumps, was the most important predictor of the 60m sprint time, maybe because of is cyclic and horizontal characteristics (more similar to the specific movement of sprint run). We suppose that the reason for results do not explain different relationship between tests and sprint performance, in young athletes can be find in multifactorial characteristics of sprinting performance and the characteristics of the subjects, youngest have reduced training adaptation
Avaliação da morfologia dos grânulos de amido de mandioca mansa e brava (Manihot esculenta Crantz).
Objetivou-se determinar os aspectos da morfologia dos grânulos de amido de genótipos de mandioca mansa e brava mantidos no Banco Ativo de Germoplasma (BAG) da Embrapa Amazônia Oriental. Deste foram coletados 12 genótipos de raÃzes de mandioca mansa e 15 genótipos de mandioca brava em triplicata, pertencentes ao BAG-Embrapa, Belém, Pará, Brasil. Após a colheita as raÃzes foram lavadas, descascadas, trituradaspara a extração do amido e mantida à 20ºC. Observou-se que os genótipos de mandioca mansa apresentaram distribuição com alta variabilidade nos diâmetros longitudinais e transversais dos grânulos de amidos e maior frequência deste parâmetro para diâmetros longitudinais entre 16,5 a 17 μm. No entanto, os genótipos de mandioca brava apresentaram baixa variabilidade de medidas, com maior frequência entre os diâmetros de 20 a 22 μm. No geral os amidos de mandioca brava apresentam tamanhos de grânulos menores do que os genótipos de mandioca mansa e tais caracterÃsticas podem variar devido à s propriedades intrÃnsecas das raÃzes de mandioca, em relação aos seus diferentes genótipo
Embryo production using epididymal sperm submitted to different selection methods and their influence on the embryo sex.
Proceedings of the 31st Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Cabo de Santo Agostinho, PE, Brazil, August 17th to 19th, 2017. Abstract
Conservation laws for self-adjoint first order evolution equations
In this work we consider the problem on group classification and conservation
laws of the general first order evolution equations. We obtain the subclasses
of these general equations which are quasi-self-adjoint and self-adjoint. By
using the recent Ibragimov's Theorem on conservation laws, we establish the
conservation laws of the equations admiting self-adjoint equations. We
illustrate our results applying them to the inviscid Burgers' equation. In
particular an infinite number of new symmetries of these equations are found
and their corresponding conservation laws are established.Comment: This manuscript has been accepted for publication in Journal of
Nonlinear Mathematical Physic
Staphylococcus spp. in the milk of dairy cows treated for mastitis with a homeopathic formulation
This study focused on determining the relationship between staphylococci and the somatic cell count (SCC) and milk production of cows with subclinical mastitis treated and not treated with a homeopathic formulation, and on monitoring these microorganisms monthly for one year
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