32 research outputs found
Sugawara-type constraints in hyperbolic coset models
In the conjectured correspondence between supergravity and geodesic models on
infinite-dimensional hyperbolic coset spaces, and E10/K(E10) in particular, the
constraints play a central role. We present a Sugawara-type construction in
terms of the E10 Noether charges that extends these constraints infinitely into
the hyperbolic algebra, in contrast to the truncated expressions obtained in
arXiv:0709.2691 that involved only finitely many generators. Our extended
constraints are associated to an infinite set of roots which are all imaginary,
and in fact fill the closed past light-cone of the Lorentzian root lattice. The
construction makes crucial use of the E10 Weyl group and of the fact that the
E10 model contains both D=11 supergravity and D=10 IIB supergravity. Our
extended constraints appear to unite in a remarkable manner the different
canonical constraints of these two theories. This construction may also shed
new light on the issue of `open constraint algebras' in traditional canonical
approaches to gravity.Comment: 49 page
Search for Gravitational Waves from Intermediate Mass Binary Black Holes
We present the results of a weakly modeled burst search for gravitational
waves from mergers of non-spinning intermediate mass black holes (IMBH) in the
total mass range 100--450 solar masses and with the component mass ratios
between 1:1 and 4:1. The search was conducted on data collected by the LIGO and
Virgo detectors between November of 2005 and October of 2007. No plausible
signals were observed by the search which constrains the astrophysical rates of
the IMBH mergers as a function of the component masses. In the most efficiently
detected bin centered on 88+88 solar masses, for non-spinning sources, the rate
density upper limit is 0.13 per Mpc^3 per Myr at the 90% confidence level.Comment: 13 pages, 4 figures: data for plots and archived public version at
https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=62326, see also the
public announcement at http://www.ligo.org/science/Publication-S5IMBH
Plasma lipid profiles discriminate bacterial from viral infection in febrile children
Fever is the most common reason that children present to Emergency Departments. Clinical signs and symptoms suggestive of bacterial infection ar
Monteagudo : revista de literatura española, hispanoamericana y teoría da la literatura ; revista de Departamento de Literatura Española y Teoría de la Literatura
Abstract. The paper outlines the rationale for using Fuzzy Logic, and Granular Computing, to emulate compositional decision making processes. Significant features of this Fuzzy Logic framework are that ambiguity in the music is maintained, while allowing the evolution of unfolding processes which reflects the temporal nature of music as performed. Granular Computing and Fuzzy Logic have been designed for physical and IT engineering applications to automate complex tasks. Fuzzy Logic is not only useful as an analytical concept, but also, can be generally applied to the production of music itself through a Fuzzy Logic control system. As artificial intelligence design and computing power both improve, it may well become possible to perform this work by digital means. My present research will contribute to this development through the identification of the significant compositional elements and their connective grammar. Once, these have been determined, then automated ways to compose music can be developed. Keywords: Fuzzy Logic, Granular Computing, Music Composition, Algorithmic Music
Carcinoma adenóide cístico de traquéia: tratamento pela laringotráqueo-esofagectomia e traqueostomia mediastinal Adenoid cystic carcinoma of the trachea: treatment by removing the larynx, trachea, and esophagus, and mediastinal tracheostomy
Os autores descrevem o caso de uma paciente de 54 anos de idade com carcinoma adenóide cístico de traquéia ao nível da cricóide, na qual foi realizada ressecção extensa, incluindo a laringe, parte da traquéia e esôfago. A reconstrução do trato digestivo foi através do tubo gástrico e a via aérea pela construção de uma traqueostomia mediastinal. Cinco anos mais tarde foi removida uma recorrência tumoral cutânea no pescoço. Sete anos depois do procedimento original, foi notada nova recorrência no mediastino, que respondeu à irradiação. A paciente encontra-se muito bem atualmente, oito anos e cinco meses após o procedimento.<br>The authors describe the case of a 54 year-old female with adenoid cystic carcinoma of the trachea at the cricoid level upon whom extensive surgical resection was performed, including the larynx, part of the trachea and esophagus. Reconstruction of the digestive tract was done by means of a gastric tube and the airway with a mediastinal tracheostomy. Five years after the original procedure there was a local cutaneous recurrence which was removed. Seven years later the disease recurred in the mediastinum, which responded to irradiation. The patient is alive and well eight years and five months after the operation