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Search Results: 1 - 10 of 485990 matches for " Jefferson A. Santos "
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Multiplicity of solutions for a class of quasilinear equations involving critical Orlicz-Sobolev nonlinear term
Jefferson A. Santos
Mathematics , 2015,
Abstract: In this work, we study the existence and multiplicity of solutions for a class of problems involving the $\phi$-Laplacian operator in a bounded domain, where the nonlinearity has a critical growth. The main tool used is the variational method combined with the genus theory for even functionals.
Contextual Interference Effect Depends on the Amount of Time Separating Acquisition and Testing  [PDF]
Jefferson John dos Santos, Flavio Henrique Bastos, Thiago de Oliveira Souza, Umberto Cesar Corrêa
Advances in Physical Education (APE) , 2014, DOI: 10.4236/ape.2014.42014
Abstract:

Considering the critical role permanence has on predictions related to the contextual interference effect, this study sought to determine whether the manifestation of the effect depends on the time interval separating the acquisition phase (AQ) from the retention test (RT). Four groups of blocked (BL) and four groups of random practice (RD) performed 90 trials of a dart throwing task (AQ) and were tested exclusively after 10 minutes (BL10 and RD10), 24 hours (BL24 and RD24), 7 days (BL7 and RD7) or 30 days (BL30 and RD30). In the AQ, blocked groups performed three blocks of trials, with each block consisting of throwing the darts from one of three distances (2 m, 2.6 m and 3.2 m). For the random groups, the trial order was pseudo-randomized. The results indicated superior performance of RD24, compared to BL24, but no difference was found between the groups tested after 10 minutes, 7 days or 30 days. Thus, our results do not support the notion that higher contextual interference promotes immediate learning benefits nor long-term retention of internal representations. Nevertheless, future research should further investigate the processes underlying the contextual interference effect, since short-term gains (24 h) were found.

On a Phi-Kirchhoff multivalued problem with critical growth in an Orlicz-Sobolev space
Giovany M. Figueiredo,Jefferson A. Santos
Mathematics , 2014, DOI: 10.3233/ASY-141243
Abstract: This paper is concerned with the multiplicity of nontrivial solutions in an Orlicz-Sobolev space for a nonlocal problem with critical growth, involving N-functions and theory of locally Lispchitz continuous functionals.
Existence of least energy nodal solution with two nodal domains for a generalized Kirchhoff problem in an Orlicz Sobolev space
Giovany M. Figueiredo,Jefferson A. Santos
Mathematics , 2015,
Abstract: We show the existence of a nodal solution with two nodal domains for a generalized Kirchhoff equation of the type $$ -M\left(\displaystyle\int_\Omega \Phi(|\nabla u|)dx\right)\Delta_\Phi u = f(u) \ \ \mbox{in} \ \ \Omega, \ \ u=0 \ \ \mbox{on} \ \ \partial\Omega, $$ where $\Omega$ is a bounded domain in $\mathbf{R}^N$, $M$ is a general $C^{1}$ class function, $f$ is a superlinear $C^{1}$ class function with subcritical growth, $\Phi$ is defined for $t\in \mathbf{R}$ by setting $ \Phi(t)=\int_0^{|t|}\phi(s)sds$, $\Delta_\Phi$ is the operator $\Delta_\Phi u:=div(\phi(|\nabla u|)\nabla u)$. The proof is based on a minimization argument and a quantitative deformation lemma.
On a nonlocal multivalued problem in an Orlicz-Sobolev space via Krasnoselskii's genus
Giovany M. Figueiredo,Jefferson A. Santos
Mathematics , 2015,
Abstract: This paper is concerned with the multiplicity of nontrivial solutions in an Orlicz-Sobolev space for a nonlocal problem involving N-functions and theory of locally Lispchitz continuous functionals.
Multiple solutions for a inclusion quasilinear problem with non-homogeneous boundary condition through Orlicz Sobolev spaces
Rodrigo C. M. Nemer,Jefferson A. Santos
Mathematics , 2015,
Abstract: In this work we extend a recent result of Krist\'aly, Marzantowicz and Varga concerning the existence of three critical points for a class non-smooth functionals. Using this result, we guarantee the existence of three solutions to a inclusion quasilinear problem, with non-homogeneous boundary condition through Orlicz Sobolev spaces.
Six-minute walk test and quality-of-life in heart failure: a correlative study with a Brazilian sample
Santos,Jefferson J. A.; Brofman,Paulo R. S.;
Insuficiencia card?-aca , 2008,
Abstract: background. quality-of-life and functional capacity in heart failure are, actually, between the most investigated topics in the scientific community. patient's self perceptions and exercise capacity can help health professionals with prognosis and decisions in heart failure treatment. specifically in brazil, the research on quality-of-life still needs to focus on the differences in the multifactor aspects of heart failure. the aim of this study is to investigate the correlation between quality-of-life and functional capacity in a sample of brazilian heart failure patients. methods. 30 male heart failure patients were included in the study. quality-of-life was assessed by the brazilian version of the minnesota living with heart failure questionnaire and the functional capacity through the six-minute walk test. differences in quality-of-life among the functional classes were evaluated through the analysis of variance and the association between the variables was assessed through pearson's coefficient. results. quality-of-life decreased significantly according to functional class (functional class i= 20±11, class ii= 35.9±18 and class iii= 58.3±24) and correlated significantly to the distance (r=-0.62, p=0.004). conclusions. longer distances obtained in the six-minute walk test can be interpreted as a better quality-of-life in brazilian heart failure patients.
Strauss- and Lions-type results for a class of Orlicz-Sobolev spaces and applications
Claudianor O. Alves,Giovany M. Figueiredo,Jefferson A. Santos
Mathematics , 2013,
Abstract: The main goal this work is to prove two results like Strauss and Lions for Orlicz-Sobolev spaces. After, we use these results for study the existence of solutions for a class of quasilinear problems in $\mathbb{R}^{N}$.
Reactive organometallics from organotellurides: application in organic synthesis
Princival, Jefferson L;Santos, Alcindo A. Dos;Comasseto, Jo?o V;
Journal of the Brazilian Chemical Society , 2010, DOI: 10.1590/S0103-50532010001100005
Abstract: in this paper the preparation of reactive organometallics starting from organotellurides is reviewed. the application of the reactive organometallics prepared in this way in the synthesis of bioactive compounds is commented.
A concise enantioselective synthesis of (+)-endo-brevicomin accomplished by a tellurium/metal exchange reaction
Ferrarini, Renan S.;Princival, Jefferson L.;Comasseto, Jo?o V.;Dos Santos, Alcindo A.;
Journal of the Brazilian Chemical Society , 2008, DOI: 10.1590/S0103-50532008000500002
Abstract: a homoenolate generated by tellurium/lithium exchange reaction was employed in a straightforward enantioselective synthesis of (+)-endo-brevicomin in 70% yield and 84.4% e.e.
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