Comparison of oscillatory behavior on InP electrodes in KOH solutions

The observation of current oscillations under potential sweep conditions when an n-InP electrode is anodized in a KOH electrolyte is reported and compared to the oscillatory behavior noted during anodization in an (NH4)2S electrolyte. In both cases oscillations are observed above 1.7 V (SCE). The charge per cycle was found to increase linearly with potential for the InP/KOH system but was observed to be independent of potential for the InP/(NH4)2S system. The period of the oscillations in the InP/KOH was found to increase with applied potential. In this case the oscillations are asymmetrical and the rising and falling segments have a different dependence on potential. Although the exact mechanism is not yet know for either system, transmission electron microscopy studies show that in both cases, the electrode is covered by a thick porous film in the oscillatory region.

Mockumentary as postnationalism: national identity in 'A Day Without a Mexican' by Sergio Arau

The turn to neoliberalism in the 1990s proved decisive for Mexico, as the NAFTA project embraced by the Salinas administration entailed a re-definition of national identity, defined since the revolution as mestizo, Catholic and especially as the Other to the United States. And just as cinema was in those days a crucial discourse for this particular construction of the identity, it was in the 1990s equally instrumental to its redefinition, which largely focused on the role of migrants to the US, presented even as supplementary in the Derridean sense. In 1992, as part of these efforts, Sergio Arau directed a mockumentary which in 2004 became a feature film, ‘A Day Without a Mexican’. As would befit more the seriousness of a documentary than the excess and parody of mockumentary, the stated aim in both was to advance a social agenda, arguing the case for immigrant labour and for Mexican presence in the US more generally. The film charts what would happen in California were all Latino immigrants to suddenly disappear, arguing chaos would ensue. Given the link between cinema and modernity and the relevance of cinema for the nation as an alternative public sphere, this chapter looks at the implications of choosing mockumentary, taken by many to be a paradigmatic postmodern and hybrid form, to discuss the hybridisation of national identity in a transnational film, in the present age of globalisation.

Ordered magnetic dipoles: controlling anisotropy in nanomodulated continuous ferromagnetic films

In this paper, the research focus is how to entangle magnetic dipoles to control/engineer magnetic properties of different devices at a submicron/nano scale. Here, we report the generation of synthetic arrays of tunable magnetic dipoles in a nanomodulated continuous ferromagnetic film. In-plane magnetic field rotations in modulated Ni 45Fe 55 revealed various rotational symmetries of magnetic anisotropy due to dipolar interaction with a crossover from lower to higher fold as a function of modulation geometry. Additionally, the effect of aspect ratio on symmetry shows a novel phase shift of anisotropy, which could be critical to manipulate the overall magnetic properties of the patterned film. The tendency to form vortex is in fact found to be very small, which highlights that the strong coupling between metastable dipoles is more favorable than vortex formation to minimize energy in this nanomodulated structure. This has further been corroborated by the observation of step hysteresis, magnetic force microscopy images of tunable magnetic dipoles, and quantitative micromagnetic simulations. An analytical expression has been derived to estimate the overall anisotropy accurately for nanomodulated film having low magnetocrystaline anisotropy. Derived mathematical expressions based on magnetic dipolar interaction are found to be in good agreement with our results.

The demise of the Beothuk as a past still present

This article aims to investigate contemporary cultural representations of the Beothuk Indians in art, literature and museum displays in Newfoundland, Canada, focussing on ways these reimagine the past for the present, offering perspectives on contested histories, such as the circumstances leading to the demise of the Beothuk. Wiped out through the impact of colonialism, the Beothuk are the ‘absent other’ who continue to be remembered and made present through the creative arts, largely at the expense of other indigenous groups on the island. Rather than focussing on the ‘non-absent past, according to Polish scholar Ewa Domańska, ‘instead we turn to a past that is somehow still present, that will not go away or, rather, that of which we cannot rid ourselves’ (2006, 346). Depictions of the last Beothuk are part of a cultural remembering where guilt and reconciliation are played out through media of the imagination