A Time-Periodic Lyapunov Approach for Motion Planning of Controllable Driftless Systems on SU(n)

For a right-invariant and controllable driftless system on SU(n), we consider a time-periodic reference trajectory along which the linearized control system generates su(n): such trajectories always exist and constitute the basic ingredient of Coron's Return Method. The open-loop controls that we propose, which rely on a left-invariant tracking error dynamics and on a fidelity-like Lyapunov function, are determined from a finite number of left-translations of the tracking error and they assure global asymptotic convergence towards the periodic reference trajectory. The role of these translations is to avoid being trapped in the critical region of this Lyapunov-like function. The convergence proof relies on a periodic version of LaSalle's invariance principle and the control values are determined by numerical integration of the dynamics of the system. Simulations illustrate the obtained controls for $n=4$ and the generation of the C--NOT quantum gate.Comment: Submitte

Estimations for the Single Diffractive production of the Higgs boson at the Tevatron and the LHC

The single diffractive production of the standard model Higgs boson is computed using the diffractive factorization formalism, taking into account a parametrization for the Pomeron structure function provided by the H1 Collaboration. We compute the cross sections at next-to-leading order accuracy for the gluon fusion process, which includes QCD and electroweak corrections. The gap survival probability ($$) is also introduced to account for the rescattering corrections due to spectator particles present in the interaction, and to this end we compare two different models for the survival factor. The diffractive ratios are predicted for proton-proton collisions at the Tevatron and the LHC for the Higgs boson mass of $M_H$ = 120 GeV. Therefore, our results provide updated estimations for the diffractive ratios of the single diffractive production of the Higgs boson in the Tevatron and LHC kinematical regimes.Comment: 20 pages, 6 figures, 3 table

Adubação nitrogenada no feijoeiro cultivado sob palhadas de diferentes culturas.

O objetivo deste trabalho é avaliar a resposta do feijoeiro irrigado, cultivado sob plantio direto em sucessão a diferentes culturas, à adubação nitrogenada em cobertura.bitstream/CNPAF-2009-09/27950/1/comt_159.pd

Dynamics of a Generalized Cosmological Scalar-Tensor Theory

A generalized scalar-tensor theory is investigated whose cosmological term depends on both a scalar field and its time derivative. A correspondence with solutions of five-dimensional Space-Time-Matter theory is noted. Analytic solutions are found for the scale factor, scalar field and cosmological term. Models with free parameters of order unity are consistent with recent observational data and could be relevant to both the dark-matter and cosmological-"constant" problems.Comment: 13 page

Depth of sulfur fertilization as affecting nodulation and grain yield of common bean.

Depth of sulfur (S) fertilization can affect common bean (Phaseolus vulgaris L.) development and a better understanding of its interaction with plant nodulation could help to improve common bean grain yield in soils under Cerrado. The objective of this study was to determine nodulation, grain yield and yield components of common bean as affected by rates and deep of S fertilization. The experimental designed was a randomized block in a factorial arrangement 4 x 2, with four replications. Treatments were the combination of sulfur rates (0, 20, 40, and 60 kg ha-1) at two depths (0.06 and 0.12 m) in two growing season (2014 and 2015). S fertilization depth did not affect number of nodules, root and shoot dry matter of common bean. The application of S in the uppermost layer provided significant increases in the number of pods per plant, number of seeds per pod and grain yield of common bean. Fertilization with S provided significant increases in grain yield of common bean. Thus, the sulfated fertilization should be considered in farming systems aiming for high yields

Synthesis of novel O-acylated-D-ribono-1,5-lactones and structural assignment supported by conventional NOESY-NMR and x-ray analysis

A practical method for the structural assignment of 3,4-O-benzylidene-D-ribono-1,5-lactones and analogues using conventional NMR techniques and NOESY measurements in solution is described. 2-O-Acyl-3,4-O-benzylidene-D-ribono-1,5-lactones were prepared in good yields by acylation of Zinner’s lactone with acyl chlorides under mildly basic conditions. Structural determination of 2-O-(4-nitrobenzoyl)-3,4-O-benzylidene-D-ribono-1,5-lactone was achieved by single crystal x-ray diffraction, which supports the results based on spectroscopic data.Este trabalho apresenta um método simples para a caracterização estrutural de 3,4-O-benzilideno-D-ribono-1,5-lactonas e análogos, fundamentado em técnicas convencionais de RMN e experimentos de NOESY em solução. 2-O-Acil-3,4-O-benzilideno-D-ribono-1,5-lactonas foram preparadas em bons rendimentos a partir da acilação das lactonas de Zinner empregando cloretos de ácido sob condições básicas. A estrutura de 2-O-(4-nitrobenzoil)-3,4-O-benzilideno-D-ribono-1,5-lactona foi determinada por difração de raios-X e confirmou, de forma inequívoca, os dados espectroscópicos obtidos.CNPq - MC

The Λ\LambdaCDM growth rate of structure revisited

We re-examine the growth index of the concordance $\Lambda$ cosmology in the light of the latest 6dF and {\em WiggleZ} data. In particular, we investigate five different models for the growth index $\gamma$, by comparing their cosmological evolution using observational data of the growth rate of structure formation at different redshifts. Performing a joint likelihood analysis of the recent supernovae type Ia data, the Cosmic Microwave Background shift parameter, Baryonic Acoustic Oscillations and the growth rate data, we determine the free parameters of the $\gamma(z)$ parametrizations and we statistically quantify their ability to represent the observations. We find that the addition of the 6dF and {\em WiggleZ} growth data in the likelihood analysis improves significantly the statistical results. As an example, considering a constant growth index we find $\Omega_{m0}=0.273\pm 0.011$ and $\gamma=0.586^{+0.079}_{-0.074}$.Comment: 8 pages, 5 figures, Accepted for publication by International J. of Modern Physics D (IJMPD). arXiv admin note: substantial text overlap with arXiv:1203.672

Livres e iguais: A (in)eficacia do principio da dignidade humana para salvaguardar os direitos das pessoas trans

Em virtude do contexto de imposição de uma ordemdiscursiva cisheteronormativa compulsória, que determina acoerência e continuidade entre sexo-gênero-sexualidade para sustentar a normatização da vida dos indivíduos, aqueles que não se classificam na bipolaridade (homem/mulher) ficam à margem da própria sociedade. E é nesse sentido que se ressalta a importância da abordagem de gênero. Nesse ínterim, através do estudo do método dedutivo-bibliográfico, o presente trabalho pretende analisar as experiências identitárias da transexualidade e da travestilidade. Isso se dará através dos estudos de Judith Butler, que afirma que o gênero é concebido a partir de ordens discursivas que se traçam com base nas relações de poder, o que influencia na determinação de um mundo binário, por meio de técnicas da normalização, que acaba limitando os espaços de constituição identitária dos sujeitos humanos. Dessa forma, a experiência trans, ao ser uma experiência identitária transgressora das normas de gênero e também em virtude da precariedade social, ao desvirtuar tais normas, relega a travestis e transexuais o status de abjeção, sendo socialmente marginalizados e considerados como ininteligível, o que lhes resulta em uma vulnerabilidade à violências físicas e simbólicas, dando ensejo a violações de direitos humanos que podem ganhar contornos radicais como a negação do direito a vida. Nesse sentido, o presente trabalho pretende fazer uma breve análise sobre se os direitos humanos, simbolizados principalmente pelo princípio da dignidade humana, são aplicados para salvaguardar os direitos dos indivíduos trans, buscando compreender como alguns organismos internacionais de proteção de direitos humano

Anisotropic elastic theory of preloaded granular media

A macroscopic elastic description of stresses in static, preloaded granular media is derived systematically from the microscopic elasticity of individual inter-grain contacts. The assumed preloaded state and friction at contacts ensure that the network of inter-grain contacts is not altered by small perturbations. The texture of this network, set by the preparation of the system, is encoded in second and fourth order fabric tensors. A small perturbation generates both normal and tangential inter-grain forces, the latter causing grains to reorient. This reorientation response and the incremental stress are expressed in terms of the macroscopic strain.Comment: 7 pages, 2 figures. Accepted version. [email protected] [email protected]