6,471 research outputs found
On the particle spectrum and the conformal window
We study the SU(3) gauge theory with twelve flavours of fermions in the
fundamental representation as a prototype of non-Abelian gauge theories inside
the conformal window. Guided by the pattern of underlying symmetries, chiral
and conformal, we analyze the two-point functions theoretically and on the
lattice, and determine the finite size scaling and the infinite volume fermion
mass dependence of the would-be hadron masses. We show that the spectrum in the
Coulomb phase of the system can be described in the context of a universal
scaling analysis and we provide the nonperturbative determination of the
fermion mass anomalous dimension gamma*=0.235(46) at the infrared fixed point.
We comment on the agreement with the four-loop perturbative prediction for this
quantity and we provide a unified description of all existing lattice results
for the spectrum of this system, them being in the Coulomb phase or the
asymptotically free phase. Our results corroborate the view that the fixed
point we are studying is not associated to a physical singularity along the
bare coupling line and estimates of physical observables can be attempted on
either side of the fixed point. Finally, we observe the restoration of the U(1)
axial symmetry in the two-point functions.Comment: 40 pages, 22 figure
One,Two,Zero: Scales of Strong Interactions
We discuss our results on QCD with a number of fundamental fermions ranging
from zero to sixteen. These theories exhibit a wide array of fascinating
phenomena which have been under close scrutiny, especially in recent years,
first and foremost is the approach to conformality. To keep this review
focused, we have chosen scale generation, or lack thereof as a guiding theme,
however the discussion will be set in the general framework of the analysis of
the phases and phase transitions of strong interactions at zero and nonzero
temperature.Comment: 15 pages, prepared for IJMPA Special Issue 'Recent Nonperturbative
Developments in QCD-like Theories
Chiral symmetry restoration in QCD with many flavours
We discuss the phases of QCD in the parameter space spanned by the number of
light flavours and the temperature with respect to the realisation of chiral
and conformal symmetries. The intriguing interplay of these symmetries is best
studied by means of lattice simulations, and some selected results from our
recent work are presented here.Comment: 10 pages, proceedings of the 9th International Workshop on Critical
Point and Onset of Deconfinement, 17-21 November, 2014, ZiF, Bielefeld,
German
Tilted boxes on inclined planes
We propose the study of a box placed on an inclined plane, with an initial tilt with respect to the plane. This is a paradigmatic example of the role played by friction as a link between translational and rotational motion. This example has two advantages over the usual example of a sphere (or cylinder) rolling down an inclined plane. First, it provides a good model for a much greater variety of "real-life" situations. Second, it exhibits a much richer structure in parameter space, even when the box starts from rest. (C) 2000 American Association of Physics Teachers
Potencial forrageiro da Brachiaria humidicola cv. Llanero (ex. B. dictyoneura) para a recria de equinos.
bitstream/item/132420/1/COT-56.pdf.pd
Otimização das técnicas de seleção do dendezeiro para avaliação da resistência à fusariose.
Resumo 454
Non-hexagonal-ring defects and structures induced by strain in graphene and in functionalized graphene
We perform {\textit ab initio} calculations for the strain-induced formation
of non-hexagonal-ring defects in graphene, graphane (planar CH), and graphenol
(planar COH). We find that the simplest of such topological defects, the
Stone-Wales defect, acts as a seed for strain-induced dissociation and
multiplication of topological defects. Through the application of inhomogeneous
deformations to graphene, graphane and graphenol with initially small
concentrations of pentagonal and heptagonal rings, we obtain several novel
stable structures that possess, at the same time, large concentrations of
non-hexagonal rings (from fourfold to elevenfold) and small formation energies
Intoxicação do Sistema Nervoso Central Durante a Implantação de um Cardioversor Desfibrilhador Implantável -- Um Caso Clínico e Revisão da Literatura
Lidocaine, a local anesthetic, is commonly used in various medical procedures. Despite its widespread use, most physicians are not familiar with the life threatening presentation of lidocaine toxicity and its treatment. Our case demonstrates successful management of local lidocaine-induced systemic toxicity in a 53-year-old female during insertion of an implantable cardioverter defibrillator. Our goal was to raise awareness of the risks and symptoms of local anesthetic toxicity, educate regarding the site of administration and dose of anesthetic delivery as independent risk factors for systemic toxicity and highlight the use of intravenous lipid emulsion as an antidote.A lidocaína é um anestético local vulgarmente usado em vários procedimentos médicos. Apesar do seu uso abrangente, a maioria dos clínicos não está familiarizada com os sinais e sintomas de toxicidade e o seu tratamento. O nosso caso demonstra o tratamento bem-sucedido de uma intoxicação sistémica de lidocaína numa mulher de 53 anos durante a implantação de um cardioversor desfibrilhador implantável (CDI). O nosso objetivo é consciencializar para os riscos, sinais e sintomas da intoxicação de anestésicos locais, informar sobre o local e dose de administração como fatores de risco independentes para a toxicidade sistémica e enfatizar ouso de emulsão lipídica como antídoto.info:eu-repo/semantics/publishedVersio
Ocorrência de fotossensibilização em equinos mantidos em pastagem de Brachiaria humidicola.
bitstream/item/138780/1/COT-40.pdfCNPGC
Reduction of Jacobi manifolds via Dirac structures theory
We first recall some basic definitions and facts about Jacobi manifolds,
generalized Lie bialgebroids, generalized Courant algebroids and Dirac
structures. We establish an one-one correspondence between reducible Dirac
structures of the generalized Lie bialgebroid of a Jacobi manifold
for which 1 is an admissible function and Jacobi quotient
manifolds of . We study Jacobi reductions from the point of view of Dirac
structures theory and we present some examples and applications.Comment: 18 page
- …