Macroturbulent Instability of the Flux Line Lattice in Anisotropic Superconductors

A theory of the macroturbulent instability in the system containing vortices of opposite directions (vortices and antivortices) in hard superconductors is proposed. The origin of the instability is connected with the anisotropy of the current capability in the sample plane. The anisotropy results in the appearance of tangential discontinuity of the hydrodynamic velocity of vortex and antivortex motion near the front of magnetization reversal. As is known from the classical hydrodynamics of viscous fluids, this leads to the turbulization of flow. The examination is performed on the basis of the anisotropic power-law current-voltage characteristics. The dispersion equation for the dependence of the instability increment on the wave number of perturbation is obtained, solved, and analyzed analytically and numerically. It is shown that the instability can be observed even at relatively weak anisotropy.Comment: 10 pages, 5 figures, submitted to Physical Review

Avaliação da biodessulfurização do carvão mineral de Santa Catarina por intemperismo natural, lixiviação com água ácida de mina e inoculação microbiana /

Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico

Romaerne på fælleden: Om at krydse globale fortællinger

Birgitta Frello's article The Roma Squatters on Amager Common deals with two narratives used to understand the situation of Roma people. On the one hand they cannot live up to the deep ingrained understanding that tells us that it is natural for all people to live and die in the country they were born in, the national narrative. On the other they cannot fit into liberalism's (and we could add postmodernism's) story about the positive possibilities inherent in the freedom to move through national borders, enjoying cultural hybridity, multiple identities, etc. Those are reserved for transnationalism from the top, but the Roma are placed among those who practice transnationalism from below: poor immigrants, refugees and others. Birgitta Frello uses the expulsion of some Roma people from Denmark in 2010 as a case study to shed light on the two narratives, their limitations and consequences.&nbsp

SLAVERNES SLÆGT: Slægtshistorie som personlig fortælling og kritisk diskurs

The empirical focus of the article is on the serial, Slaves in the Family, which the Danish TV channel, DR2, launched in January 2005. It is a serial of four programs on Scandinavian descendants of slaves primarily from the former Danish colony of the West Indies: St. John, St. Thomas and St. Croix. This serial is analysed with special reference to the ways in which kinship is represented and the implications of these forms of representation. The first part of the analysis focuses on three specific narratives of kinship, which are presented during the serial. The question is how the participants individually make sense of their consanguinity with slaves. The second part of the analysis focuses on the serial’s overall narrative and the consequences, which the choice of ‘kinship’ as a narrative device has for the construction of the story. It is argued that the serial, by telling this story through the lens of kinship, partly undermines its own proclaimed critical perspective. Rather than being a story of re-viewing history and claiming responsibility for the atrocities, which were committed by the Danish state and by other Danish agencies during colonial time, it becomes a story of re-uniting family bonds which have been unrightfully torn apart. By this move, the categorical distinction between white and black, Scandinavian and African, master and slave, is denied, rather than transgressed and the potentially subversive story of the hybrid descent of the Danes is displaced by a sentimental quest for a ‘true’ personal identity. &nbsp

Avaliação da toxicidade aguda do agrotóxico carbofuran utilizando reativos biológicos :: poecilia reticulata e daphnia magna /

Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico