O CONTEXTO DO PÚBLICO-ALVO COMO BASE PARA O PLANEJAMENTO DE MATERIAIS DIDÁTICOS E AULAS NA EDUCAÇÃO A DISTÂNCIA

Este estudo trata de questões relacionadas ao contexto do estudante como parte integrante do planejamento de aulas e elaboração ou escolha de materiais didáticos na Educação a Distância. Nesse sentido foi levantada a importância acerca do público-alvo e seus aspectos sociais, culturais, econômicos e educacionais para a definição dos conteúdos propostos. Além disso, frisou-se a relevância da revisão dos planejamentos ao longo do curso, considerando a evolução dos estudantes. Para tanto, foi realizada uma pesquisa com professores atuantes no ensino a distância buscando verificar como esses pontos são tratados por eles em seus planejamentos. A análise dos dados possibilita visualizar como a prática docente na modalidade EAD estuda os perfis de seus alunos e como tratam esses aspectos para contribuir com o processo de ensino-aprendizagem desses estudantes. Foi possível inferir também na análise alguns desafios que ainda existem, especialmente no que diz respeito à coerência entre a pesquisa de perfil e o planejamento

Mode transformations and entanglement relativity in bipartite gaussian states

A proper choice of subsystems for a system of identical particles e.g., bosons, is provided by second-quantized modes i.e.,creation/annihilation operators. Here we investigate how the entanglement properties of bipartite gaussian states of bosons change when modes are changed by means of unitary, number conserving, Bogolioubov transformations. This set of "virtual" bi-partitions is then finite-dimensionally parametrized and one can quantitatively address relevant questions such as the determination of the minimal and maximal available entanglement. In particular, we show that in the class of bipartite gaussian states there are states which remain separable for every possible modes redefinition, while do not exist states which remain entangled for every possible modes redefinitionComment: LaTeX 7 pages, 7 figures. Many typos (sorry) fixe

Brane orbits

We complete the classification of half-supersymmetric branes in toroidally compactified IIA/IIB string theory in terms of representations of the T-duality group. As a by-product we derive a last wrapping rule for the space-filling branes. We find examples of T-duality representations of branes in lower dimensions, suggested by supergravity, of which none of the component branes follow from the reduction of any brane in ten-dimensional IIA/IIB string theory. We discuss the constraints on the charges of half-supersymmetric branes, determining the corresponding T-duality and U-duality orbits.Comment: 34 pages, 3 figure

Black Holes, Qubits and Octonions

We review the recently established relationships between black hole entropy in string theory and the quantum entanglement of qubits and qutrits in quantum information theory. The first example is provided by the measure of the tripartite entanglement of three qubits, known as the 3-tangle, and the entropy of the 8-charge STU black hole of N=2 supergravity, both of which are given by the [SL(2)]^3 invariant hyperdeterminant, a quantity first introduced by Cayley in 1845. There are further relationships between the attractor mechanism and local distillation protocols. At the microscopic level, the black holes are described by intersecting D3-branes whose wrapping around the six compact dimensions T^6 provides the string-theoretic interpretation of the charges and we associate the three-qubit basis vectors, |ABC> (A,B,C=0 or 1), with the corresponding 8 wrapping cycles. The black hole/qubit correspondence extends to the 56 charge N=8 black holes and the tripartite entanglement of seven qubits where the measure is provided by Cartan's E_7 supset [SL(2)]^7 invariant. The qubits are naturally described by the seven vertices ABCDEFG of the Fano plane, which provides the multiplication table of the seven imaginary octonions, reflecting the fact that E_7 has a natural structure of an O-graded algebra. This in turn provides a novel imaginary octonionic interpretation of the 56=7 x 8 charges of N=8: the 24=3 x 8 NS-NS charges correspond to the three imaginary quaternions and the 32=4 x 8 R-R to the four complementary imaginary octonions. N=8 black holes (or black strings) in five dimensions are also related to the bipartite entanglement of three qutrits (3-state systems), where the analogous measure is Cartan's E_6 supset [SL(3)]^3 invariant.Comment: Version to appear in Physics Reports, including previously omitted new results on small STU black hole charge orbits and expanded bibliography. 145 pages, 15 figures, 41 table

WFPC2 Observations of the Hubble Deep Field-South

The Hubble Deep Field-South observations targeted a high-galactic-latitude field near QSO J2233-606. We present WFPC2 observations of the field in four wide bandpasses centered at roughly 300, 450, 606, and 814 nm. Observations, data reduction procedures, and noise properties of the final images are discussed in detail. A catalog of sources is presented, and the number counts and color distributions of the galaxies are compared to a new catalog of the HDF-N that has been constructed in an identical manner. The two fields are qualitatively similar, with the galaxy number counts for the two fields agreeing to within 20%. The HDF-S has more candidate Lyman-break galaxies at z > 2 than the HDF-N. The star-formation rate per unit volume computed from the HDF-S, based on the UV luminosity of high-redshift candidates, is a factor of 1.9 higher than from the HDF-N at z ~ 2.7, and a factor of 1.3 higher at z ~ 4.Comment: 93 pages, 25 figures; contains very long table

Radiological chest manifestations in diffuse infiltrative lymphocytosis syndrome (DILS)

This report focuses on the radiological manifestations of diffuse interstitial lymphocytosis syndrome (DILS) in the chest. Awareness of this entity and early diagnosis by radiologists will enable timeous intervention by clinicians.http://www.journals.co.za/sama/m_sajr.htm

Stationary D=4D=4 Black Holes in Supergravity: The Issue of Real Nilpotent Orbits

The complete classification of the nilpotent orbits of ${\rm SO}(2,2)^2$ in the representation ${\bf (2,2,2,2)}$, achieved in \cite{Dietrich:2016ojx}, is applied to the study of multi-center, asymptotically flat, extremal black hole solutions to the STU model. These real orbits provide an intrinsic characterization of regular single-center solutions, which is invariant with respect to the action of the global symmetry group ${\rm SO}(4,4)$, underlying the stationary solutions of the model, and provide stringent regularity constraints on multi-centered solutions. The known \emph{almost-BPS} and \emph{composite non-BPS} solutions are revisited in this setting. We systematically provide, for the relevant ${\rm SO}(2,2)^2$-nilpotent orbits of the global Noether charge matrix, regular representatives thereof. This analysis unveils a composition law of the orbits according to which those containing regular multi-centered solutions can be obtained as combinations of specific single-center orbits defining the constituent black holes. Some of the ${\rm SO}(2,2)^2$-orbits of the total Noether charge matrix are characterized as "intrinsically singular" in that they cannot contain any regular solution.Comment: 104 pages, LaTeX source and 29 figure