14,199 research outputs found
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
Recommended from our members
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
A Curriculum Data Base for Continuing Education for Ministers in the Colombia-Venezuela Union Mission of the Seventh-day Adventist Church
Background and Purpose of the Study. The Seventh-day Adventist Church is seeking research data on which to base the planning and development of efficient continuing education for ministry programs geographically and culturally adapted to the territories where the ministers are serving. As a needs assessment, the study sought data regarding the societies in which the program functions, the ministers\u27 attitudes toward their ministerial training, their needs and aspirations on subject matter, learning-situation preferences, motivations, and obstacles for continuing education. The study also surveyed the opinions of administrators, departmental directors, and lay leaders at the Union, Conference, and Mission levels.
Methodology. Societal factors of the countries of the Colombia-Venezuela Union Mission were collected and organized from existing sources. Information concerning the ministers was obtained by a questionnaire with two five-point scales. Data were analyzed and rankings were developed for: level of ministers\u27 preparation, needs, scores indicating the difference between need and preparation, motivators, deterrents, and learning situations.The Chi-square test of independence was selected to determine significance using the .05 alpha level.
Findings. The societal factors considered significant for a continuing education curriculum were: (1) religious freedom and degree of preoccupation with spiritual matters; (2) education as a way of economic development and social change; (3) expansion of educational services and number of professionals; (4) importance of family kinship; (5) growth patterns of the population; (6) health hazards; and (7) growth patterns of the Seventh-day Adventist Church.
The return rate for administrators and departmental directors was 83 percent; for ministers, 81 percent, and lay leaders, 77 percent. The survey revealed that ministers need a wide range of improvement in pastoral skills and theological-biblical-historical subjects. The ranking of general subject-matter areas by groups of respondents was: (1) evangelistic skills, (2) church leadership, (3) pastors\u27 personal/professional development, (4) theology and Biblical studies, (5) preaching/worship skills, (6) pastoral care, and (7) church history.
Recommendations. Based on the findings of the study, the recommendations fell in three categories: (1) curricular recommendations, (2) general recommendations for the planning of continuing education, and (3) recommendations for further study. (Abstract shortened with permission of author.
- …