Results in Kalb-Ramond field localization and resonances on deformed branes

We make an analysis about several aspects of localization of the Kalb-Ramond gauge field in a specific four dimensional AdS membrane embedded in a five dimensional space-time. The membrane is generated from a deformation of the $\lambda \phi^4$ potential and belongs to a new class of defect solutions. In this context we find resonance structures in the analysis of massive modes. The study of deformed defects is important because they contain internal structures and these may have implications to the way the background space-time is constructed and the way its curvature behaves. The main objective here is to observe the contributions of the deformation procedure to the resonances and the well known field localization methods.Comment: 6 pages, 7 figures, Latex with EPL macr

Effect of the Milky Way on Magellanic Cloud structure

A combination of analytic models and n-body simulations implies that the structural evolution of the Large Magellanic Cloud (LMC) is dominated by its dynamical interaction with the Milky Way. Although expected at some level, the scope of the involvement has significant observational consequences. First, LMC disk orbits are torqued out of the disk plane, thickening the disk and populating a spheroid. The torque results from direct forcing by the Milky Way tide and, indirectly, from the drag between the LMC disk and its halo resulting from the induced precession of the LMC disk. The latter is a newly reported mechanism that can affect all satellite interations. However, the overall torque can not isotropize the stellar orbits and their kinematics remains disk-like. Such a kinematic signature is observed for nearly all LMC populations. The extended disk distribution is predicted to increase the microlensing toward the LMC. Second, the disk's binding energy slowly decreases during this process, puffing up and priming the outer regions for subsequent tidal stripping. Because the tidally stripped debris will be spatially extended, the distribution of stripped stars is much more extended than the HI Magellanic Stream. This is consistent with upper limits to stellar densities in the gas stream and suggests a different strategy for detecting the stripped stars. And, finally, the mass loss over several LMC orbits is predicted by n-body simulation and the debris extends to tens of kiloparsecs from the tidal boundary. Although the overall space density of the stripped stars is low, possible existence of such intervening populations have been recently reported and may be detectable using 2MASS.Comment: 15 pages, color Postscript figures, uses emulateapj.sty. Also available from http://www-astro.phast.umass.edu/~weinberg/weinberg-pubs.htm

Two-Dimensional Dilaton-Gravity Coupled to Massless Spinors

We apply a global and geometrically well-defined formalism for spinor-dilaton-gravity to two-dimensional manifolds. We discuss the general formalism and focus attention on some particular choices of the dilatonic potential. For constant dilatonic potential the model turns out to be completely solvable and the general solution is found. For linear and exponential dilatonic potentials we present the class of exact solutions with a Killing vector.Comment: 21 pages, LaTeX, minor changes in text and format, final version to appear in Classical and Quantum Gravit

Chemical vapor deposition of highly conjugated, transparent boron carbon nitride thin films

Ternary materials made up only from the lightweight elements boron, carbon, and nitrogen are very attractive due to their tunable properties that can be obtained by changing the relative elemental composition. However, most of the times, the synthesis requires to use up to three different precursor and very high temperatures for the synthesis. Moreover, the low reciprocal solubility of boron nitride and graphene often leads to BN-C composite materials due to phase segregation. Herein, an innovative method is presented to prepare BCN thin films by chemical vapor deposition from a single source precursor, melamine diborate. The deposition occurs homogenously at relatively low temperatures generating very high degree of sp2 conjugation. The as-prepared thin films possess high transparency and refractive index values in the visible range that are of interest for reflective mirrors and lenses. Furthermore, they are wide-bandgap semiconductor with very positive valence band, making these materials very stable against oxidation of interest as protective coating and charge transport layer for solar cells. The simple chemical vapor deposition method that relies on commonly available and low-hazard precursor can open the way for application of BCN thin films in optics, optoelectronics, and beyond

Free Fields for Chiral 2D Dilaton Gravity

We give an explicit canonical transformation which transforms a generic chiral 2D dilaton gravity model into a free field theory.Comment: LaTeX file, 4 pages, to appear in Phys. Rev.

Comparação das metodologias da análise descritiva quantitativa e perfil livre para Análise sensorial de carne bovina maturada.

Este trabalho teve como objetivo comparar os resultados de análise sensorial de carne maturada obtidos pelas metodologias da Análise Descritiva Quantitativa (ADQ) e Perfil Livre. Foram utilizados dez animais, machos castrados, sendo cinco de cada um dos dois grupos genéticos: Angus x Nelore (AN) e Senepol x Nelore (SE). Os animais foram abatidos em estabelecimento industrial. Do músculo longissimus da meia-carcaça esquerda, cortado entre a 12a e a 13a costelas, foram retirados bifes de 2,5 cm de espessura para a análise sensorial. O desenvolvimento da terminologia descritiva das amostras foi realizado baseando-se no Método de Rede. No perfil livre, para cada provador foi elaborada uma ficha de avaliação das amostras e uma lista de descritores específicos (glossário) individualizadas, enquanto que para o ADQ, foi elaborada uma ficha consenso, com catorze atributos, cujos extremos e referências foram amplamente discutidos na equipe. Dez provadores (diferentes equipes para cada metodologia) analisaram cinco amostras de cada grupo genético/tempo em duplicata, totalizando vinte amostras para cada provador. As amostras foram submetidas ao tratamento térmico em forno pré-aquecido à 180°C até atingir a temperatura de 75ºC no centro geométrico, controlado por termopares. A ordem de apresentação das amostras, codificadas com números aleatórios dentro de cada sessão, foi balanceada com o objetivo de minimizar o efeito da posição nos julgamentos. Os dados gerados pela técnica do Perfil Livre foram analisados utilizando a Análise de Procrustes Generalizada (GPA) e os de ADQ, por Análise de Componentes Principais (ACP). No Perfil Livre, a porcentagem de explicação obtida para as duas primeiras dimensões foi de 95,67%, enquanto que para a ADQ, foi de 89,28%, sendo ambos considerados satisfatórios. As duas metodologias mostraram-se efetivas para separar as amostras estudadas, isto é, as amostras maturadas e não maturadas, bem como os dois grupos genéticos estudados

q- Deformed Boson Expansions

A deformed boson mapping of the Marumori type is derived for an underlying $su(2)$ algebra. As an example, we bosonize a pairing hamiltonian in a two level space, for which an exact treatment is possible. Comparisons are then made between the exact result, our q- deformed boson expansion and the usual non - deformed expansion.Comment: 8 pages plus 2 figures (available upon request

Geometrodynamical Formulation of Two-Dimensional Dilaton Gravity

Two-dimensional matterless dilaton gravity with arbitrary dilatonic potential can be discussed in a unitary way, both in the Lagrangian and canonical frameworks, by introducing suitable field redefinitions. The new fields are directly related to the original spacetime geometry and in the canonical picture they generalize the well-known geometrodynamical variables used in the discussion of the Schwarzschild black hole. So the model can be quantized using the techniques developed for the latter case. The resulting quantum theory exhibits the Birkhoff theorem at the quantum level.Comment: 15 pages, LATE