Localized Dispersive States in Nonlinear Coupled Mode Equations for Light Propagation in Fiber Bragg Gratings.

Dispersion effects induce new instabilities and dynamics in the weakly nonlinear description of light propagation in fiber Bragg gratings. A new family of dispersive localized pulses that propagate with the group velocity is numerically found, and its stability is also analyzed. The unavoidable different asymptotic order of transport and dispersion effects plays a crucial role in the determination of these localized states. These results are also interesting from the point of view of general pattern formation since this asymptotic imbalance is a generic situation in any transport-dominated (i.e., nonzero group velocity) spatially extended system

K-orbit closures and Barbasch-Evens-Magyar varieties

We define the Barbasch-Evens-Magyar variety. We show it is isomorphic to the smooth variety defined in [D. Barbasch-S. Evens '94] that maps finite-to-one to a symmetric orbit closure, thereby giving a resolution of singularities in certain cases. Our definition parallels [P. Magyar '98]'s construction of the Bott-Samelson variety [H. C. Hansen '73, M. Demazure '74]. From this alternative viewpoint, one deduces a graphical description in type A, stratification into closed subvarieties of the same kind, and determination of the torus-fixed points. Moreover, we explain how these manifolds inherit a natural symplectic structure with Hamiltonian torus action. We then prove that the moment polytope is expressed in terms of the moment polytope of a Bott-Samelson variety.Comment: 26 pages, 4 figure

Toda joia, toda beleza! Finding what is left in the margins or regime collisions: A pluralist take on managerialism

This paper has two authors, two titles and is written in the form of a dialogue,rather than conveying a unitary voice, as one would instead expect of a coauthored paper. The reason for this is that the articulation of the authors' disagreement, despite the identification of each of them with “the left”, is precisely the object of inquiry. After briefly introducing the problem on which the authors’ discussion takes place, namely regime collisions, and the clash of approaches that are available to (decide whether to) deal with them, a dialogue follows, in which the authors’ voices are clearly separated as they discuss the specific issue of the measurement of quality as a (managerialist) proposal to “solve” regime collisions, and contrast that to more openly politicised views of approaching regime collisions. In the end, the main features of such discussion are examined in such a way as to bring forth the peculiar self-consciousness that pluralist spaces give rise to, weakening and downsizing every point of view that appoints itself as the “higher” vantage point from which to describe the world and enumerate problems, and stimulating a constant oscillation between perspectives. This commitment to a pluralistic confrontation and the ensuing hybridization of perspectives is, we argue, at the heart of the idea of “the left” which we both identify with

Leaf reflectance-nitrogen-chlorophyll relations among three south Texas woody rangeland plant species

Annual variations in the nitrogen-chlorophyll leaf reflectance of hackberry, honey mesquite and live oak in south Texas, were compared. In spring, leaf reflectance at the 0.55 m wavelength and nitrogen (N) concentration was high but leaf chlorophyll (chl) concentrations were low. In summer, leaf reflectance and N-concentration were low but lead chl concentrations were high. Linear correlations for both spring and summer of leaf reflectance with N and chl concentration or deviations from linear regression were not statistically significant

Juan de la Cueva, artifex exclusus: un poeta en los “márgenes” del Parnaso sevillano, a propósito del Viage de Sannio

Recordaba Cervantes, en el “Canto de Calíope” de La Galatea (IV, 57), la necesidad de librar del “eterno olvido” la obra de Juan de la Cueva (1543-1612)1. De tales versos –que insisten en una palmaria reivindicación canónica–, se deduce que ya, por esos años, un lector tan avisado como el autor del Quijote consideraba que Cueva no había gozado del lugar merecido. Las razones que hicieron posible esta rémora son, según veremos, variadas. Pero a ello debió contribuir, de entrada, el complejo carácter de Cueva2 y su obsesión a la hora de reclamar un puesto en el Parnaso sevillano así como en los círculos académicos de la ciudad. Sorprende, por otra parte, el hecho de que Cueva no rece en los proyectos más notorios de este círculo elitista, como el Recibimiento de Mal Lara o las Anotaciones de Herrera. De esta suerte, da la impresión de que nuestro poeta sufrió un “desplazamiento” canónico quedando relegado a los márgenes del Parnaso

Allowing Undocumented Immigrants to Obtain Driver\u27s Licenses in New Mexico: Revising, Not Abandoning, the System

Although Gov. Martinez has yet to successfully repeal the 2003 Amendments, the question of whether or not to allow undocumented immigrants to obtain driver\u27s licenses has dominated New Mexico state politics since the passage of HB 173, and it has entered the national spotlight as immigration has become a hot-button issue in recent years. The national attention given to the debate over whether to repeal HB 173 led to the composition of this Note. The outcome of this debate, as well as the successes and failures of HB 173, could influence immigration policy in New Mexico and other states for years to come. If HB 173 is deemed a success, and the 2003 Amendments are not revoked, more states might adopt similar policies. In contrast, if issues of fraud are not appropriately addressed, other states might be less likely to follow New Mexico\u27s lead. Part II of this Note begins with the history of HB 173 and the policies supporting its passage. This is followed by an overview of the arguments made by both supporters and opponents of HB 173 on the bill\u27s effect on New Mexico. These arguments include concerns about fraud, Gov. Martinez\u27s attempts to have the 2003 Amendments repealed, New Mexico\u27s temporary residency verification program, and Arizona\u27s passage of Senate Bill 1070 (SB 1070), as well as the effect of SB 1070 on the number of driver\u27s licenses issued to undocumented immigrants in New Mexico. This overview transitions into a discussion of the current status of the debate over HB 173 in New Mexico. Following the historical examination, Part III critically analyzes the effect of HB 173. This analysis is followed by Part IV, in which several proposals are set forth for resolving the issue in a manner that balances the interests of all parties involved