Role of hexagonal boron nitride in protecting ferromagnetic nanostructures from oxidation

Ferromagnetic contacts are widely used to inject spin polarized currents into non-magnetic materials such as semiconductors or 2-dimensional materials like graphene. In these systems, oxidation of the ferromagnetic materials poses an intrinsic limitation on device performance. Here we investigate the role of ex-situ transferred chemical vapour deposited hexagonal boron nitride (hBN) as an oxidation barrier for nanostructured cobalt and permalloy electrodes. The chemical state of the ferromagnets was investigated using X-ray photoemission electron microscopy owing to its high sensitivity and lateral resolution. We have compared the oxide thickness formed on ferromagnetic nanostructures covered by hBN to uncovered reference structures. Our results show that hBN reduces the oxidation rate of ferromagnetic nanostructures suggesting that it could be used as an ultra-thin protection layer in future spintronic devices.Comment: 7 pages, 6 figure

Potential of a New Technique for Remote Sensing of Hydrocarbon Accumulations and Blind Uranium Deposits: Buried Lif Thermoluminescence Dosimeters

Buried thermoluminescence dosimeters may be useful in remote sensing of petroleum and natural gas accumulations and blind uranium deposits. They act as integrating detectors that smooth out the effects of environmental variations that affect other measuring systems and result in irregularities and poor repeatability in measurements made during gas and radiometric surveys

Utilização de energia solar e cercas eletrificadas no manejo das pastagens no Acre.

Este documento apresenta informações que visam orientar técnicos e produtores rurais do Acre para o uso eficiente da energia solar e das cercas eletrificadas no manejo de suas propriedades.bitstream/item/116523/1/7296.pd

Fairy-tale enchantments

More than two decades ago the folklorist Isabel Cardigos remarked that the hinge of fairy tales is the cyclical movement in and out of enchantment. I feel that this insight is important, and I propose to briefly explain my understanding of it. First, I mention the importance of using allomotifs to bring out the folk metaphors in fairy tales. Then, I discuss a basic symbolic pa﬒ern of enchantments at the core of fairy tales. Overall, I add to Vladimir Propp’s statement that the most complete fairy tale is a heroic quest the proposition that the irreducible core of fairy tales hinges on feminine maturation. Along the way, I discuss some metaphors suggestive of the lunar template at the core of fairy tales.info:eu-repo/semantics/publishedVersio

Fairy-Tale exchanges

Fairy tales are very old—their themes are found in legends and myths from Antiquity, and even those early texts likely borrowed from oral traditions humming in the background. Given the respectable age of this genre and its formal complexity, one can assume that all fairy tales are genetically related. At least, as an eminent specialist pointed out, the entire store of fairy tales can be examined as a chain of variants on a basic theme. This amounts to saying that fairy tales partake of a shared conceptual universe—a notion that raises interesting questions, such as: what are fairy tales about? What sorts of intertextual conversations do they accommodate? And how can we apprehend fairy-tale exchanges?info:eu-repo/semantics/acceptedVersio

Folklore into theory: Freud and Lévi-Strauss on incest and marriage

This article suggests that two major modern theories on incest and its prohibition, successively proposed by Freud and by Lévi-Strauss, are essentially transformations on a folklore leitmotiv tottering with age. The discussion examines Freud's weaving of traditional themes into psychoanalytic theory, and then engages Lévi-Strauss' meta-Freud-ian elaboration. This inquiry leads to asking whether penetration into the products of the mind by the mind necessarily involves reenacting fundamental patterns of thought. This question raises the issue of the status of theorization in academic realms, such as folklore and mythology, where discipline and object fuse into a single denomination

Metaphor in comparative studies, or, the folklore of anthropology: Frazer, Malinowski, Trobriand, and us

This article looks at the nineteenth-century preconception that ‘primitives’ ignore fatherhood—how it crept into ethnographic reports, made its way into anthropological theory, and sparked debates for the best part of a century. The discussion looks at the influential work of James Frazer and Sidney Hartland—at how these authors relied on folk metaphors to reason about the ignorance of ‘primitives’—and exposes Bronislaw Malinowski’s place in that tradition. Beyond revisiting Trobriand ethnography, this article argues that knowledge in anthropology and folkloristics is inherently metaphorical. The article makes a case for heeding metaphors across cultures, including in scholarly models, as a tool for understanding the varieties of human thinking.info:eu-repo/semantics/acceptedVersio

Hybridity

This chapter suggests that the core of fairy tales is enchantment, which is ruled by cyclic time. The discussion examines a transmedial string of variants of “The Maiden in the Tower” (ATU 310) and “Sleeping Beauty” (ATU 410)—stories about the fate of girls in tower enclosures, suspended between heaven and earth—and shows ambivalent fairies in the business of helping girls come of age. As cloistered maidens spin a spindle, they cycle along with the moon; as girls prick a finger, they mark with blood the thread of their lives. Cyclic time, which straddles opposites, breeds hybridity.info:eu-repo/semantics/acceptedVersio