Expectativa e satisfação dos alunos de ciências contábeis com relação às competências docentes

O tema de competências docentes vem sendo muito discutido no meio acadêmico. Especificamente na área contábil seu aprimoramento se acentua com as recentes alterações na legislação societária brasileira de 2007 e a convergência com as normas internacionais. Também é vivenciada nos últimos anos a expansão do ensino superior brasileiro refletindo mudanças nas IES. Neste cenário, é preocupante a qualidade do ensino oferecido aos futuros profissionais que vem sendo mais exigidos pelo mercado. Neste contexto a presente pesquisa tem o objetivo de avaliar o grau de satisfação e expectativa dos estudantes do curso de Ciências Contábeis com relação às competências docentes. Foi aplicado um questionário nos alunos das instituições: UFPR, UTFPR e UFMG. Foram obtidas 202 respostas validadas por meio da AFE e Alfa de Cronbach. As respostas indicam alunos regularmente satisfeitos (4,76) com seus docentes, porém suas expectativas são superiores as vivenciadas no curso (7,20). As competências do trabalho em equipe entre docentes e a criatividade são os pontos pior avaliados na ótica satisfação, enquanto a ética é a melhor avaliada. Com relação às expectativas, é mais esperado pelos discentes o pleno domínio do conteúdo. A amostra é maçicamente jovem e são do gênero feminino. As mulheres estão mais satisfeitas e esperam mais de seus docentes. Com relação às IES, as expectativas são similares e a satisfação possui diferença estatística significativa, com os alunos da UTFPR mais satisfeitos e os da UFMG e UFPR meno

Classical analogy for the deflection of flux avalanches by a metallic layer

Sudden avalanches of magnetic flux bursting into a superconducting sample undergo deflections of their trajectories when encountering a conductive layer deposited on top of the superconductor. Remarkably, in some cases flux is totally excluded from the area covered by the conductive layer. We present a simple classical model that accounts for this behaviour and considers a magnetic monopole approaching a semi-infinite conductive plane. This model suggests that magnetic braking is an important mechanism responsible for avalanche deflection.Comment: 14 pages, 5 figure

Measurement of critical current flow and connectivity in systems of joined square superconducting plates

A method to measure the electrical connectivity between square superconducting plates joined by weak link interfaces is presented. It is based on observation of lines where the flow of critical current abruptly changes direction due to the presence of weak links, and the confinement created by the shape of the sample. The method is demonstrated using magneto-optical imaging (MOI) of systems consisting of up to 2 X 2 plates joined to form a larger square. Common features are found in the current flow patterns, which allow to measure the electrical connectivity between the plates by observing an angle between pairs of lines indicating where the current abruptly changes flow direction, so-called discontinuity, or d-lines. The samples used in this study are Nb films with weak links created by focused ion beam machining

Genomic variability of Pantoea ananatis in maize white spot lesions assessed by AFLP markers.

Measures to control maize white spot (MWS) caused by Pantoea ananatis are preferentially based on resistant cultivars. A lack of knowledge on the genetic variability of pathogens could interfere with the development and utilization of controlling strategies in this pathosystem. The main goals of this study were to investigate the genetic variability of 90 P. ananatis isolates from three different eco-geographical regions of Brazil by amplified fragment length polymorphism (AFLP), and to determine the presence of a universal P. ananatis plasmid in isolates from tropical Brazil. Analysis of genetic similarity by AFLP allowed us to categorize the 90 isolates into two groups. However, no correlation between the collecting sites and genetic groupings was observed. The polymorphism percentage found in P. ananatis ranged between 24.64 and 92.46%, and genetic diversity was calculated to be 0.07-0.09. The analysis of molecular variance showed that 99.18% of genetic variability was within the populations, providing evidence that evolutionary forces were acting on these populations. All P. ananatis isolates showed the P. ananatis universal plasmid (280 or 352 kb). This is the first report on the presence of a universal P. ananatis plasmid from MWS lesions in the tropical area

Spin texture on top of vortex avalanches in Nb/Al_2O_3/Co thin film heterostructures

We report on magneto-optical imaging, magnetization, Hall effect and magneto-resistance experiments in Nb/Al_2O_3/Co thin film heterostructures. The magnetic field is applied perpendicularly to the plane of the film and gives rise to abrupt flux penetration of dendritic form. A magnetization texture is imprinted in the Co layer in perfect coincidence with these ramifications. The spin domains that mimic the vortex dendrites are stable upon the field removal. Moreover, the imprinted spin structure remains visible up to room temperature. Complementary magnetization, Hall effect and magneto-resistance experiments were performed in a similar sample where electrical contacts were placed on the Co layer. In the region of the field - temperature diagram where flux instabilities are known to occur in Nb films, irregular jumps are observed in the magnetic hysteresis and large amplitude noise is detected in the magneto-resistance and Hall resistivity data when measured as a function of the field.Comment: 13 pages, 8 figure

Magnetic field-induced weak-to-strong-link transformation in patterned superconducting films

Ubiquitous in most superconducting materials and a common result of nanofabrication processes, weak-links are known for their limiting effects on the transport of electric currents. Still, they are at the root of key features of superconducting technology. By performing quantitative magneto-optical imaging experiments and thermomagnetic model simulations, we correlate the existence of local maxima in the magnetization loops of FIB-patterned Nb films to a magnetic field-induced weak-to-strong-link transformation increasing their critical current. This phenomenon arises from the nanoscale interaction between quantized magnetic flux lines and FIB-induced modifications of the device microstructure. Under an ac drive field, this leads to a rectified vortex motion along the weak-link. The reported tunable effect can be exploited in the development of new superconducting electronic devices, such as flux pumps and valves, to attenuate or amplify the supercurrent through a circuit element, and as a strategy to enhance the critical current in weak-link-bearing devices.Comment: 12 pages and 5 figure