5,492 research outputs found
Rigidity, natural kind terms and metasemantics
No description supplie
Externalism, internalism and logical truth
The aim of this paper is to show what sorts of logics are required by externalist and internalist accounts of the meanings of natural kind nouns. These logics give us a new perspective from which to evaluate the respective positions in the externalist--internalist debate about the meanings of such nouns. The two main claims of the paper are the following: first, that adequate logics for internalism and externalism about natural kind nouns are second-order logics; second, that an internalist second-order logic is a free logicâa second order logic free of existential commitments for natural kind nouns, while an externalist second-order logic is not free of existential commitments for natural kind nounsâit is existentially committed
Assessment Sensitivity about Future Contingents, Vindication and Self-Refutation
John MacFarlane has recently argued that his brand of truth relativism â
Assessment Sensitivity â provides the best solution to the puzzle of future
contingents: statements about the future that are metaphysically neither
necessary nor impossible. In this paper, we show that even if we grant all of
the metaphysical, semantic and pragmatic assumptions in terms of which
MacFarlane sets and solves the puzzle, Assessment Sensitivity is ultimately
self-refutin
Nanocomposite Fe1xO=Fe3O4, Fe=Fe1xO thin films prepared by RF sputtering and revealed by magnetic coupling effects
Magnetic and semi-conducting nanocomposite iron oxide thin films have been prepared under bias polarization, by radio-frequency sputtering of a magnetite target. The nature of the phases obtained in the thin films depends on the bias power density. The increase in power density, from 0 to 110mW=cm2, allows the preparation of magnetite, magnetite/wustite and wustite/a-iron nanocomposites successively. Magnetic measurements at low temperature show exchange bias for two-phases films even though the minor phase is not detected by grazing angle X-ray diffraction. The exchange bias can reach very high values of about 4300 Oe. Electrical properties at room temperature are interpreted taking into account both the modifications of the film compactness, and the nature of the phases from which they are made
Patterned ferrimagnetic thin films of spinel ferrites obtained directly by laser irradiation
Some spinel ferrites can be oxidized or transformed at moderate temperatures. Such modifications werecarried out on thin films of mixed cobalt copper ferrites and maghemite, by heating small regions with alow-power laser spot applied for about 100 ns. The very simple laser heating process, which can be donedirectly with a conventional photolithographic machine, made it possible to generate two-dimensionalmagnetization heterogeneities in ferrimagnetic films. Such periodic structures could display the specificproperties of magneto-photonic or magnonic crystals
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