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Search Results: 1 - 10 of 194841 matches for " Douglas G "
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Unjustified Restrictions on Letters to the Editor
Douglas G Altman
PLOS Medicine , 2005, DOI: 10.1371/journal.pmed.0020126
Abstract:
Tourism planning in small tropical islands: methodological considerations and development issues in Samoa
Douglas G. Pearce
études Caribeénnes , 2010, DOI: 10.4000/etudescaribeennes.1393
Abstract: En présentant la méthodologie utilisée dans la présentation du Plan d’Aménagement Touristique de Samoa 2002-2006, ce chapitre cherche à éclaircir certains aspects de l’aménagement touristique dans les petites les tropicales, ainsi que ceux de la planification touristique en ces lieux. Plus spécifiquement, cette étude présente une approche basée sur la formulation de questions destinées aux diverses parties intéressées afin d’identifier et puis d’adresser les points-clés de l’aménagement touristique dans le pays. Quatre questions principales résultent de ce processus, à savoir : Combien de tourisme veut le pays et à quel rythme doit-il se développer pendant les cinq années à venir ? De quels facteurs dépend la croissance du tourisme pendant la période 2002-2006 ? Quelles formes de tourisme faut-il développer et à quels endroits ? Quels sont les processus d’aménagement touristique les plus appropriés pour Samoa? On présente ensuite les stratégies formulées dans le plan. Pour conclure, il semble que la participation locale, bien qu’inappréciable, soit insuffisante par elle-même pour préparer un plan d’aménagement touristique efficace. This chapter seeks to contribute to a greater understanding of tourism on small tropical islands and to tourism planning in this context by outlining aspects of the methodology used in the preparation of the Samoa Tourism Development Plan 2002-2006 and by discussing some of the issues that arose from this process. In particular, the chapter presents a ‘question-asking’ approach that involves wide-ranging stakeholder consultation to identify and then address key issues, namely: - How much tourism does Samoa want and at what rate should it be developed over the next five years? - What will the growth of tourism in Samoa over the period 2002-2006 depend on? - What forms of tourism should be developed and where? - What are the most appropriate processes of tourism development for Samoa? The strategies formulated in the plan are then outlined. The paper concludes that local participation, while invaluable, is by itself insufficient for the preparation of an effective tourism development plan. Este capítulo presenta la metodología utilizada en la preparación del Plan de Desarrollo Turístico de Samoa 2002-2006 y traza sus líneas generales. De esta manera, el plan pone de manifiesto los puntos claves del desarrollo turístico en las peque as islas tropicales y los aspectos metodológicos de la planificación turística en ese contexto. En particular, el trabajo presenta un enfoque basado en la formulación de preguntas destinadas
The Isgur Wise function from the Lattice
UKQCD Collaboration,G. Douglas
Physics , 1999,
Abstract: We derive the form factors relevant for decays of pseudo-scalar mesons corresponding to the semi-leptonic decay B->D l nu. The simulations are performed in the quenched approximation at beta=6.0 and beta=6.2 using a non-perturbatively improved clover action. The slope of the Isgur Wise function and |Vcb| are extracted from the form factors.
Classical entanglement
Douglas G. Danforth
Physics , 2001,
Abstract: Classical systems can be entangled. Entanglement is defined by coincidence correlations. Quantum entanglement experiments can be mimicked by a mechanical system with a single conserved variable and 77.8% conditional efficiency. Experiments are replicated for four particle entanglement swapping and GHZ entanglement.
Operator Theory and Complex Geometry
Ronald G. Douglas
Mathematics , 2007,
Abstract: One approach to multivariate operator theory involves concepts and techniques from algebraic and complex geometry and is formulated in terms of Hilbert modules. In these notes we provide an introduction to this approach including many proofs. We are particularly interested in examples related to hermitian holomorphic vector bundles and we study submodules and reducing submodules in such cases. We go into some detail concerning a problem of Zhu on the reducing subspaces of powers of the Bergman shift as well as more recent work of the author and J. Sarkar on proper submodules which are unitarily equivalent to the orginal. Although the basic results are not new, there is some novelty in the details and the organization of the material.
Variations on a theme of Beurling
Ronald G. Douglas
Mathematics , 2010,
Abstract: Interpretations of the Beurling-Lax-Halmos Theorem on invariant subspaces of the unilateral shift are explored using the language of Hilbert modules. Extensions and consequences are considered in both the one and multivariate cases with an emphasis on the classical Hardy, Bergman and Drury-Arveson spaces.
Connections of the Corona Problem with Operator Theory and Complex Geometry
Ronald G. Douglas
Mathematics , 2012,
Abstract: The corona problem was motivated by the question of the density of the open unit disk D in the maximal ideal space of the algebra, H1(D), of bounded holomorphic functions on D. In this note we study relationships of the problem with questions in operator theory and complex geometry. We use the framework of Hilbert modules focusing on reproducing kernel Hilbert spaces of holomorphic functions on a domain, in Cm. We interpret several of the approaches to the corona problem from this point of view. A few new observations are made along the way. 2012 MSC: 46515, 32A36, 32A70, 30H80, 30H10, 32A65, 32A35, 32A38 Keywords: corona problem, Hilbert modules, reproducing kernel Hilbert space, commutant lifting theorem 1
A new kind of index theorem
Ronald G. Douglas
Mathematics , 2005,
Abstract: Index theory has had profound impact on many branches of mathematics. In this note we discuss the context for a new kind of index theorem. We begin, however, with some operator theoretic results. In [11] Berger and Shaw established that finitely cyclic hyponormal operators have trace-class self-commutators. In [9], [31] Berger and Voiculescu extended this result to operators whose self-commutators can be expressed as the sum of a positive and a trace-class operator. In this note we show this result can't be extended to operators whose self-commutator can be expressed as the sum of a positive and a S_p-class operator. Then we discuss a conjecture of Arveson [4] on homogeneous submodules of the m-shift Hilbert space H^2_m and propose some refinements of it. Further, we show how a positive solution would enable one to define K-homology elements for subvarieties in a strongly pseudo-convex domain with smooth boundary using submodules of the corresponding Bergman module. Finally, we discuss how the Chern character of these classes in cyclic cohomology could be defined and indicate what we believe the index to be.
Ideals in Toeplitz Algebras
Ronald G. Douglas
Mathematics , 2003,
Abstract: We determine the ideal structure of the Toeplitz C*-algebra on the bidisk.
Essentially Reductive Hilbert Modules II
Ronald G. Douglas
Mathematics , 2006,
Abstract: Many Hilbert modules over the polynomial ring in m variables are essentially reductive, that is, have commutators which are compact. Arveson has raised the question of whether the closure of homogeneous ideals inherit this property and provided motivation to seek an affirmative answer. Positive results have been obtained by Arveson, Guo, Wang and the author. More recently, Guo and Wang extended the results to quasi-homogeneous ideals in two variables. Building on their techniques, in this note the author extends this result to Hilbert modules over certain Reinhardt domains such as ellipsoids in two variables and analyzes extending the result to the closure of quasi-homogeneous ideals in m variables when the zero variety has dimension one.
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