1,165 research outputs found
Scalar form factors and nuclear interactions
The scalar-isoscalar term in the two-pion exchange potential is
abnormally large and does not respect the hierarchy of effects predicted by
chiral perturbation theory. We argue that this anomaly is associated with
non-perturbative effects, which are also present in the scalar form
factor.Comment: Talk given at the 20EFB, Pisa, Italy, September 2007. 3 pages and 4
figure
Exploring universality in nuclear clusters with Halo EFT
I present results and highlight aspects of halo EFT to loosely bound systems
composed of nucleons and alpha particles, with emphasis on Coulomb
interactions.Comment: 3 pages, 2 figures, talk given at the 21th European Conference on
Few-Body Problems in Physics, Salamanca, Aug. 29th - Sep. 3rd, 201
Banco de Dados de Genótipos e Fenótipos (BDGF) para suporte a estudos de associação genômica ampla e seleção genômica em programas de melhoramento animal.
Este documento complementa os trabalhos previamente desenvolvidos, apresentando um modelo de dados para armazenamento de dados de genótipos, fenótipos e pedigree de animais de interesse agropecuário para suporte tanto a experimentos de GWAS quanto a programas de melhoramento genético animal, Banco de Dados de Genótipos e Fenótipos(BDGF).bitstream/item/138127/1/Doc133.pd
The rate of convergence of Euler approximations for solutions of stochastic differential equations driven by fractional Brownian motion
The paper focuses on discrete-type approximations of solutions to
non-homogeneous stochastic differential equations (SDEs) involving fractional
Brownian motion (fBm). We prove that the rate of convergence for Euler
approximations of solutions of pathwise SDEs driven by fBm with Hurst index
can be estimated by ( is the diameter of
partition). For discrete-time approximations of Skorohod-type quasilinear
equation driven by fBm we prove that the rate of convergence is .Comment: 21 pages, (incorrect) weak convergence result removed, to appear in
Stochastic
Incorporação das propriedades rotâmeros e ocupância em métodos de análise estrutural de proteínas.
Conformação das cadeias laterais (rotâmeros); Dupla ocupância; Java Protein Dossier.bitstream/CNPTIA/9893/1/comuntec34.pdfAcesso em: 30 maio 2008
Relativistic two-pion exchange nucleon-nucleon potential: configuration space
We have recently performed a relativistic chiral expansion of the
two-pion exchange potential, and here we explore its configuration space
content. Interactions are determined by three families of diagrams, two of
which involve just and , whereas the third one depends on
empirical coefficients fixed by subthreshold data. In this sense, the
calculation has no adjusted parameters and gives rise to predictions, which are
tested against phenomenological potentials. The dynamical structure of the
eight leading non-relativistic components of the interaction is investigated
and, in most cases, found to be clearly dominated by a well defined class of
diagrams. In particular, the central isovector and spin-orbit, spin-spin, and
tensor isoscalar terms are almost completely fixed by just and .
The convergence of the chiral series in powers of the ratio (pion mass/nucleon
mass) is studied as a function of the internucleon distance and, for 1 fm,
found to be adequate for most components of the potential. An important
exception is the dominant central isoscalar term, where the convergence is
evident only for 2.5 fm. Finally, we compare the spatial behavior of the
functions that enter the relativistic and heavy baryon formulations of the
interaction and find that, in the region of physical interest, they differ by
about 5%.Comment: 27 pages, 33 figure
Curvatura da superfície de proteínas no Java Protein Dossier.
Definição de superfície. Cálculo dos valores de curvatura com SurfRace.bitstream/CNPTIA/9897/1/comuntec38.pdfAcesso em: 30 maio 2008
Criação de um núcleo para a pesquisa e descrição dos serviços oferecidos na área de Bioinformática estrutural.
Instalação e oferta de ferramentas.Computacionais sting millennium suite. (SMS) através da interface web. Criação de novos algoritmos e programas. Para análise estrutural das proteínas. Oferta de banco de dados públicos. Estabelecimento de um ambiente para.Pesquisa e oferta de serviços na área. De bioinformática. Formação de recursos humanos. Organização de cursos e congresso. Projetos em colaboração.bitstream/CNPTIA/9951/1/doc25.pdfAcesso em: 29 maio 2008
Cálculo de área acessível por solvente utilizando SURFV - definição de interface intramolecular pelo SMS.
Definição de superfície acessível por solvente. Cálculo de AS. Utilização de SURFV para cálculo da área da AS e identificação de interface. Discussão e trabalhos futuros.bitstream/CNPTIA/9895/1/comuntec36.pdfAcesso em: 30 maio 2008
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