Hypercontractivity and asymptotic behaviour in nonautonomous Kolmogorov equations

We consider a class of nonautonomous second order parabolic equations with unbounded coefficients defined in $I\times\R^d$, where $I$ is a right-halfline. We prove logarithmic Sobolev and Poincar\'e inequalities with respect to an associated evolution system of measures $\{\mu_t: t \in I\}$, and we deduce hypercontractivity and asymptotic behaviour results for the evolution operator $G(t,s)$

Asymptotic behavior in time periodic parabolic problems with unbounded coefficients

We study asymptotic behavior in a class of non-autonomous second order parabolic equations with time periodic unbounded coefficients in $\mathbb R\times \mathbb R^d$. Our results generalize and improve asymptotic behavior results for Markov semigroups having an invariant measure. We also study spectral properties of the realization of the parabolic operator $u\mapsto {\cal A}(t) u - u_t$ in suitable $L^p$ spaces

The Impact of Cosumers' Attitude on Online Video Advertising Towards Product Branding

Online video advertising is becoming much more common and data shows that companies' demand for online video advertising is increasing rapidly. However, there is a scarcity of research done about the consumers' perspective on online video advertising and there is still little evidence that online video advertising is beneficial for companies and the products being advertised. This research would like to find out the impact of consumers' attitude on online video advertising towards product branding. Consumer attitude itself is divided into cognitive, affective and behavioral components. The research was done using Android One as the case study. 100 respondents from Surabaya were taken and personally asked to watch the online video advertising and fill in questionnaires. Data from the questionnaires were analyzed using multiple linear regression. Results show that consumers' attitude on online video advertising has significant positive effect towards product branding and all three component of consumer attitude have significant positive effect towards product branding individually with affective component having the most impact. Therefore it is recommended to promote using online video advertising and create online video advertising that focus more on giving affective impact to consumers

Gauged Thirring Model in the Heisenberg Picture

We consider the (2+1)-dimensional gauged Thirring model in the Heisenberg picture. In this context we evaluate the vacuum polarization tensor as well as the corrected gauge boson propagator and address the issues of generation of mass and dynamics for the gauge boson (in the limits of QED$_3$ and Thirring model as a gauge theory, respectively) due to the radiative corrections.Comment: 14 pages, LaTex, no figure

Spin 1 fields in Riemann-Cartan space-times "via" Duffin-Kemmer-Petiau theory

We consider massive spin 1 fields, in Riemann-Cartan space-times, described by Duffin-Kemmer-Petiau theory. We show that this approach induces a coupling between the spin 1 field and the space-time torsion which breaks the usual equivalence with the Proca theory, but that such equivalence is preserved in the context of the Teleparallel Equivalent of General Relativity.Comment: 8 pages, no figures, revtex. Dedicated to Professor Gerhard Wilhelm Bund on the occasion of his 70th birthday. To appear in Gen. Rel. Grav. Equations numbering corrected. References update

A comunicação da Embrapa Trigo em um dia de campo de inverno 2013.

Editores técnicos: Joseani Mesquita Antunes, Ana Lídia Variani Bonato, Márcia Barrocas Moreira Pimentel

Características, dificuldades e desafios do professor e da prática pedagógica em biologia : a visão de alunos de licenciatura

Neste estudo, investigamos a compreensão de alunos do último ano do curso de licenciatura em Ciências Biológicas sobre características relevantes ao professor de Biologia, dificuldades e dos desafios da prática pedagógica em Biologia. Os dados revelaram que as características fundamentais ao professor são características pessoais e o conteúdo específico; as principais dificuldades são infra-estrutura e alunos e os desafios são desenvolvimento da postura critica e de aspectos didáticos e de conteúdo. Os alunos compreendem a dimensão técnica e política da profissão de professor, o que pode ter implicações positivas para uma atuação profissional crítica e comprometida com a transformação social