Direct instantons, topological charge screening, and QCD glueball sum rules

Nonperturbative Wilson coefficients of the operator product expansion (OPE) for the spin-0 glueball correlators are derived and analyzed. A systematic treatment of the direct instanton contributions is given, based on a realistic instanton size distribution and renormalization at the operator scale. In the pseudoscalar channel, topological charge screening is identified as an additional source of (semi-) hard nonperturbative physics. The screening contributions are shown to be vital for consistency with the anomalous axial Ward identity, and previously encountered pathologies (positivity violations and the disappearance of the 0(-+) glueball signal) are traced to their neglect. on the basis of the extended OPE, a comprehensive quantitative analysis of eight Borel-moment sum rules in both spin-0 glueball channels is then performed. The nonperturbative OPE coefficients turn out to be indispensable for consistent sum rules and for their reconciliation with the underlying low-energy theorems. The topological short-distance physics strongly affects the sum rule results and reveals a rather diverse pattern of glueball properties. New predictions for the spin-0 glueball masses and decay constants and an estimate of the scalar glueball width are given, and several implications for glueball structure and experimental glueball searches are discussed.

Evaluation of economic impact of external eauivalent models used in reactive OPF studies for interconnected systems

Reactive-optimisation procedures are responsible for the minimisation of online power losses in interconnected systems. These procedures are performed separately at each control centre and involve external network representations. If total losses can be minimised by the implementation of calculated local control actions, the entire system benefits economically, but such control actions generally result in a certain degree of inaccuracy, owing to errors in the modelling of the external system. Since these errors are inevitable, they must at least be maintained within tolerable limits by external-modelling approaches. Care must be taken to avoid unrealistic loss minimisation, as the local-control actions adopted can lead the system to points of operation which will be less economical for the interconnected system as a whole. The evaluation of the economic impact of the external modelling during reactive-optimisation procedures in interconnected systems, in terms of both the amount of losses and constraint violations, becomes important in this context. In the paper, an analytical approach is proposed for such an evaluation. Case studies using data from the Brazilian South-Southeast system (810 buses) have been carried out to compare two different external-modelling approaches, both derived from the equivalent-optimal-power-flow (EOPF) model. Results obtained show that, depending on the external-model representation adopted, the loss representation can be flawed. Results also suggest some modelling features that should be adopted in the EOPF model to enhance the economy of the overall system.

Some implications of the cosmological constant to fundamental physics

In the presence of a cosmological constant, ordinary Poincaré special relativity is no longer valid and must be replaced by a de Sitter special relativity, in which Minkowski space is replaced by a de Sitter spacetime. In consequence, the ordinary notions of energy and momentum change, and will satisfy a different kinematic relation. Such a theory is a different kind of a doubly special relativity. Since the only difference between the Poincaré and the de Sitter groups is the replacement of translations by certain linear combinations of translations and proper conformal transformations, the net result of this change is ultimately the breakdown of ordinary translational invariance. From the experimental point of view, therefore, a de Sitter special relativity might be probed by looking for possible violations of translational invariance. If we assume the existence of a connection between the energy scale of an experiment and the local value of the cosmological constant, there would be changes in the kinematics of massive particles which could hopefully be detected in high-energy experiments. Furthermore, due to the presence of a horizon, the usual causal structure of spacetime would be significantly modified at the Planck scale. © 2007 American Institute of Physics.

Análise das propagandas dos medicamentos isentos de prescrição veiculadas em revistas para prescritores na área médica

This article presents an analysis of the quality of advertisements for over-the-counter (OTC) drugs addressed to the medical profession, based on the new Anvisa resolution RDC 96 (17/12/2008). For this analysis, 16 volumes of the Brazilian Journal of Medicine (RBM) were collected, from August 2009 to December 2010. To investigate the quality of the adverts, we prepared a questionnaire divided into three parts. In total, 160 advertisements were found, of which 27 were related to drugs exempt from prescription, from 9 laboratories. It was observed that none of the advertisements complied fully with the new rules, as required by legislation (RDC 96/08), with violations ranging from identification of the advert to prohibitions of human figures and subjective messages. Therefore, it was concluded that there is a need to implement more effective monitoring, so as to improve the quality of the adverts, so they can be used as a reliable source of information and update by prescribers.

Polinômios fracionários em modelos de regressão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Sob a vigência da Ancine (2001-2011): trajetória, mecanismos e a ingerência da economia da cultura na cinematografia

Pós-graduação em Ciências Sociais - FCLAR

A atuação de agentes públicos junto a meninas vítimas de abuso e exploração sexual em Ribeirão Preto

Pós-graduação em Ciências Sociais - FCLAR

Fluxos e densidades de energia negativa em teoria quântica de campos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Concepções e práticas de profissionais de educação sobre os maus-tratos contra crianças

Pós-graduação em Educação - FCT

Avaliação de impacto ambiental do cemitério Jardim dos Lírios do município de Bauru - SP

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise da fragilidade ambiental em área urbana: o caso da bacia hidrográfica do Córrego do Castelo, Bauru (SP)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

O conceito de segurança da Organização do Tratado do Atlântico Norte (OTAN) e a intervenção dos Balcãs (1999)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

As normas multilaterais para o combate ao terrorismo: uma análise das políticas dos EUA no pós 11 de setembro e sua recepção nos espaços decisórios da ONU

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A luta por direitos étnicos e coletivos frete à expansão do agronegócio: a experiência das comunidades tradicionais faxinalenses

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A corte interamericana de Direitos Humanos e a implementação de políticas públicas brasileiras

Pós-graduação em Direito - FCHS