Time resolved pattern evolution in a large aperture laser

We have measured quasi-instantaneous transverse patterns in a broad aperture laser. Non-ordered patterns yielding to boundary determined regular structures in progressive time-integrated recording are observed. The linear analysis and numerical integration of the full Maxwell-Bloch equations allow us to interpret the features of the experiment. We show that this system being far from threshold cannot be fully understood with a perturbative model.Comment: 7 pages, 5 GIF figures . To be published in Phys. Rev. Let

χάριζ χάριν ψάρ έστιν ή τίκτονσ' άεί. Una lectura de Sófocles, Áyax 522

La χάριζ y la ética de la reciprocidad que este concepto implica son imprescindibles para comprender Áyax, la primera tragedia conservada de Sófocles. En concreto, nosotros proponemos una reflexión sobre la utilización de este término en el v. 522 y una nueva lectura, que implica una revaloración de la escena y una mejor comprensión de la fuerza retórica que subyace en el pasaje y, en general, en todo el discurso de Tecmesa del que este verso forma parte.χάριζ and the ethics of reciprocity that this concept involves are essential to understand Ajax, the first Sophoclean tragedy which is still extant. In particular, we propose a reflexion about the use of this term in v. 522 and a new reading, which involves a revaluation of the scene and a better comprehension of the rhetorical effect that underlies in the passage and, in general, along Tecmessa's speech, to which this verse belongs

The Role of Intuition in Metaphysics

In this paper I consider the possibility of a kind of a priori cognition that serves the purposes of metaphysics, given that metaphysics involves the search for modal knowledge. Necessary or, better, modal knowledge is a priori; so metaphysical knowledge is likewise a priori. Here I argue that intuition is the route to modal knowledge in metaphysics, and I insist that conceivability or knowledge of conceptual truths does not lead towards the modal realm of metaphysics

Magnetic force microscopy investigation of arrays of nickel nanowires and nanotubes

The magnetic properties of arrays of nanowires (NWs) and nanotubes (NTs), 150 nm in diameter, electrodeposited inside nanoporous polycarbonate membranes are investigated. The comparison of the nanoscopic magnetic force microscopy (MFM) imaging and the macroscopic behavior as measured by alternating gradient force magnetometry (AGFM) is made. It is shown that MFM is a complementary technique that provides an understanding of the magnetization reversal characteristics at the microscopic scale of individual nanostructures. The local hysteresis loops have been extracted by MFM measurements. The influence of the shape of such elongated nanostructures on the dipolar coupling and consequently on the squareness of the hysteresis curves is demonstrated. It is shown that the nanowires exhibit stronger magnetic interactions than nanotubes. The non-uniformity of the magnetization states is also revealed by combining the MFM and AGFM measurements.Comment: 7 pages, 5 figure

Inventario espeleológico de Mallorca

Abstract not availabl