Theoretical and experimental optical holography

The intent of this paper is to present an analysis of optical holography. Both the physical theory behind holography and the experimental techniques used in making holograms will be presented. To accomplish this goal, the paper is divided into two independent sections: the theoretical section followed by the experimental section. Each section is intended to be a complete unit. The Theoretical Section is an exposure to the theory behind holography. This consists of a review of the concepts of interference and diffraction. followed by a brief review of partial coherence. The remaining part of the Theoretical Section is devoted to the mathematical analysis of optical holography. The Experimental Section begins with an introduction to the equipment and facilities currently available for optical holography at Colby College. Holographic procedures is dominated by the description of transmission holography (v.s. reflection. or white-light. holography). After these general holographic procedures a few variations on the basic transmission hologram are presented. The experimental section will end with an introduction to holographic interferometry, a major application of holographic techniques.

Model Configuration And Data Management In The Short-Term Water Information Forecasting Tools

The Short-term Water Information and Forecasting Tools (SWIFT) is a suite of tools for flood and short-term streamflow forecasting, consisting of a collection of hydrologic model components and utilities. Catchments are modeled using conceptual subareas and a node-link structure for channel routing. The tools comprise modules for calibration, model state updating, output error correction, ensemble runs and data assimilation. Given the combinatorial nature of the modelling experiments and the sub-daily time steps typically used for simulations, the volume of model configurations and time series data is substantial and its management is not trivial. SWIFT is currently used mostly for research purposes but has also been used operationally, with intersecting but significantly different requirements. Early versions of SWIFT used mostly ad-hoc text files handled via Fortran code, with limited use of netCDF for time series data. The configuration and data handling modules have since been redesigned. The model configuration now follows a design where the data model is decoupled from the on-disk persistence mechanism. For research purposes the preferred on-disk format is JSON, to leverage numerous software libraries in a variety of languages, while retaining the legacy option of custom tab-separated text formats when it is a preferred access arrangement for the researcher. By decoupling data model and data persistence, it is much easier to interchangeably use for instance relational databases to provide stricter provenance and audit trail capabilities in an operational flood forecasting context. For the time series data, given the volume and required throughput, text based formats are usually inadequate. A schema derived from CF conventions has been designed to efficiently handle time series for SWIFT.

The LDC debt problem: a game-theoretical analisys

We review the LDC debt crisis since 1982, by means of game theory. New insights are obtained into the reasons behind the formation of the creditors' carte1 and the nature of the difficu1ties invo1ved in the formation of the debtors' carte1. The standard view that Rubinstein's barganing mode1s are appropriate for dea1ing with debt re1ief is shown to be faulty, un1ess the debtor buys out the debt.

Relations between regulation, competition policy and consumer protection in telecommunications, electricity and water supply

The purpose of this article is to discuss the relations between regulation, competition policy and consumer protection these relations in three key sectors of Brazil’s infrastructure: telecommunications, electricity and water supply. A study of the literature points to two general principles. First, the need for consumer protection depends on the “degree of sovereignty” enjoyed by consumers, defined in terms of the cost of consumer organization, consumers’ ability to evaluate services, and the level of competition in each sector. Second, the less sovereignty consumers enjoy the more consumer protection institutions are involved with regulation agencies. The evidence for the Brazilian case apparently corroborates these points. In addition, it is important to stress that consumer complaints in regulated sectors seem to have increased more intensely than in others. The article is divided into three sections. Section 1 presents theoretical elements and aspects of the relations between regulation, competition policy and consumer protection evidenced by international experience. Section 2 analyzes the Brazilian experience and in particular the available statistics on consumer complaints about telecommunications, electricity and water supply, submitted to Fundação Procon-SP during the nineties. The last section points to possible configurations of the institutional relations between competition policy, regulation and consumer protection, showing how the existing configuration of these areas in the three infrastructure sectors discussed confirms that the theoretical framework proposed has reasonable predictive power.

A articulação entre regulação, defesa da concorrência e proteção do consumidor nos setores de telecomunicações, energia elétrica e saneamento básico

O objetivo deste relatório é estudar a relação entre proteção ao consumidor, regulação e defesa da concorrência em três setores de infra-estrutura no Brasil: telecomunicações, energia elétrica e saneamento básico. A Seção I deste relatório apresenta uma descrição sintética dos três segmentos selecionados. A Seção II discute aspectos teóricos da relação entre proteção ao consumidor, de um lado, e regulação e defesa da concorrência, de outro, a partir da experiência brasileira e internacional. A Seção III apresenta a experiência brasileira de regulação dos três setores. A Seção IV apresenta algumas estatísticas recentes de reclamações dos consumidores, ainda não suficientemente exploradas pela pesquisa acadêmica. A Seção V discute possíveis configurações institucionais entre proteção ao consumidor, regulação e defesa da concorrência, sugerindo uma explicação para a configuração atual dessas áreas nos três segmentos de infra-estrutura selecionados.

O impacto das práticas ITIL na flexibilidade organizacional - evidências empíricas em uma empresa multinacional de TI

The present work has as main objective the identification and impact analysis for the practice ITIL in the organizational flexibility of a multinational IT company, being this study of quali-quantitative and exploratory nature. To achieve this objective, some theoretical studies on bureaucracy, organization flexibility, control, IT governance and ITIL were done, as a form to better understand the research problem. For analysis effect a set of eleven ITIL process was considered in this research ¿ service desk, incident management, problem management, change management, configuration management, release management, service level management, availability management, capacity management, continuity management and finally IT financial services management ¿ grouped in its two core areas ¿ service support and service delivery. Then a scale was constructed and validated, on the basis of theoretical models developed by Volberda (1997), Tenório (2002) and Golden and Powell (1999), to measure the flexibility related to each process comprising the ITIL core. The dimensions adopted to measure flexibility were: organization design task, managerial task, IT impact on work force, HR management, efficiency impact, sensitivity, versatility and robustness. The instrument used in research was a semi-structured interview, which was divided in two parts. The data collection was performed with ten interviewed people from an IT multinational company, based on convenience, some were managers and there were users, some were ITIL certified and others not. The statistic tests of t student and Wilcoxon non-parametric were adopted. The result of the research indicated that the ITIL service support area, for possessing greater operational focus, presents flexibility trend. The opposite was found for the service delivery area, which has greater tactical focus. The results also suggest that the change management discipline was the one that contributed for the most flexibility inside the company, followed by incident management discipline and the service desk function.