The phonon dispersion and the lattice contribution to dielectric function of PbTe in NaCl structure are calculated ab initio. results obtained agreement with available experimental data reproduce main features observed this material, such as an anharmonic LA-TO coupling $\ensuremath{\Gamma}$-X direction, well high values for constants ${\ensuremath{\epsilon}}_{1}(0)$ ${\ensuremath{\epsilon}}_{1}(\ensuremath{\infty})$. Calculations include pressure dependence indicate that is very sensitive...

Abstract In this work, we present our theoretical results for the relaxation of rutile TiO 2 (110), as well adsorption benzene over surface. Our are in good agreement with both available and experimental data, whenever these comparisons were possible. Based on obtained results, show that interaction between adsorbate (110) surface shows a van der Waalslike character, calculated energies at order 43 to 173 meV. process, H atoms prefer bind Ti atoms. As result, two occupied electronic levels...

In this work we investigated the nature of one-magnon eigenstates in a disordered chain at presence non-uniform magnetic field. our study, analyzed one-dimensional ferromagnetic Heisenberg model within framework. The spin-spin interaction was considered as correlated disorder distribution with power law spectrum S(k)∝k−α. By using numerical methods calculated time evolution initially localized Gaussian wave-packet. Our results reveal that for weak correlations (α<1), wave-packet remains...

We consider interacting electrons moving in a nonlinear Morse lattice. set the initial conditions as follows: were initially localized at center of chain and solitonic deformation was produced by an impulse excitation on chain. By solving quantum classical equations for this system numerically, we found that fraction electronic wave function trapped excitation, trapping specificities depend degree interaction among electrons. Also, there is evidence effective electron velocity depends...

Abstract: Phonological awareness, intelligence, vocabulary and socioeconomic status (SES) have been considered important variables in the acquisition of reading. Nevertheless, attention deficit is associated to low reading performance. The purpose this work was investigate correlations among phonological vocabulary, focused skills children with SES exposed a non-effective teaching environment. This study included 111 belonging classes D E who were enrolled at state school. Results pointed...

We consider the one-magnon subspace of a quantum Heisenberg Hamiltonian with ferromagnetic ground state. In this model, spins belong to chain which contains cubic interaction between nearest neighbors atoms. The spin-spin coupling is function distance them. By providing numerical solution nonlinear lattice we found that magnon-lattice affects magnon dynamics in distinct ways: for specific range values, magnon-soliton pair observed. Moreover, an effective repulsion magnon's excitation and...

O profissional contábil, de tempos em tempos, recebe críticas decorrentes seu comportamento frente a dilemas éticos, e por vezes o contador é demonstrado como alguém que não se preocupa com virtudes morais. No Brasil do contábil regulado, dentre outros, pelo Código Ética Profissional Contabilista apresenta expectativas conduta sanções para os infratores. Este fato faz disciplina ética nos currículos dos cursos superiores Ciências Contábeis enfoque mais as regras elaboradas comportamentos...

In this work, we consider a one-electron moving on Fermi, Pasta, Ulam disordered chain under effect of electron–phonon interaction and Gaussian acoustic pulse pumping. We describe electronic dynamics using quantum mechanics formalism the nonlinear atomic vibrations standard classical physics. Solving numerical equations related to coupled quantum/classical behavior system, study propagation properties. Our calculations suggest that pumping associated with electron–lattice promote...

Este estudo tem como objetivo identificar o nível de adesão práticas governança cooperativa e sua relação sobre desempenho das cooperativas financeiras brasileiras, considerando contexto Segmentação do Sistema Financeiro Nacional (SFN), normativo que instituiu proporcionalidade regulatória adequou à regra brasileira aos padrões internacionais Basileia. A metodologia foi dividia em duas etapas: a primeira identificou proxy Governança Cooperativa (GCoop) com aplicação questionário,...

The vibrational modes with nonzero frequency are localized in harmonic lattice disordered masses. In our work, we investigated numerically the propagation of energy long-range correlated masses, which randomly distributed power law spectrum S ( k ) ∝ - α . For = 0, a standard uncorrelated mass distribution was observed and for > 0 its exhibits intrinsic correlations. Our procedure done by numerical solution classical equations displacement velocities. Energy flow after injection an initial...

In this work, the wave‐packet dynamics is considered under effect of diagonal disorder distribution, electron–lattice interaction, and acoustic‐wave pumping. Electronic transport taken into account quantum mechanically, whereas lattice vibrations are described through a classical nonlinear Morse Hamiltonian. The electronic hopping term takes form an exponential function effective distance between nearest‐neighbor elements. electron initially localized at first site chain alongside Gaussian...

The objective of this study was to analyze the implicit use relative performance evaluation in BMFBovespa listed companies as a way measure remuneration its executives. To define sample, we sought identify that disclosed information about compensation their executives between 2009 and 2012, totaling sample size 67 companies, 112 observations. They were then categorized order capture risk sharing predicted by theory evaluation. results research indicate strong asymmetry distribution...

O presente estudo teve como objetivo avaliar os conhecimentos sobre saúde bucal dos docentes do ensino fundamental das escolas públicas de um município Alagoas e identificar as condutas adotadas pelos professores frente aos problemas bucais mais frequentes. Para isso, realizou-se descritivo, com abordagem quantitativa, junto a 77 docentes, por meio questionário eletrônico organizado em duas partes: primeira, aspectos sociodemográficos práticas pedagógicas segunda, questões específicas...

Este trabalho possui dois importantes objetivos. Primeiro, esquematizar os mecanismos que levam à ausência de completude da estabilização macroeconômica brasileira iniciada em 1994. Segundo, ao fazer uso dados oficiais do Tesouro Nacional e daqueles consideram a contabilidade criativa utilizada nos últimos anos, prover duas evidências dessa incompletude: i) desequilíbrio fiscal Governo Federal por meio análise rating; ii) sustentabilidade política modelo Bohn (1998).