Performance Evaluation of Different PV-Array Configurations under Weak Light Conditions and Partial Shadings

The paper analyses empirical performance data of five commercial PV-plants in Germany. The purpose was on one side to investigate the weak light performance of the different PV-modules used. On the other hand it was to quantify and compare the shading losses of different PV-array configurations. The importance of this study relies on the fact that even if the behavior under weak light conditions or the shading losses might seem to be a relatively small percentage of the total yearly output; in projects where a performance guarantee is given, these variation can make the difference between meeting or not the conditions.When analyzing the data, a high dispersion was found. To reduce the optical losses and spectral effects, a series of data filters were applied based on the angle of incidence and absolute Air Mass. To compensate for the temperature effects and translate the values to STC (25°C), five different methods were assessed. At the end, the Procedure 2 of IEC 60891 was selected due to its relative simplicity, usage of mostly standard parameters found in datasheets, good accuracy even with missing values, and its potential to improve the results when the complete set of inputs is available.After analyzing the data, the weak light performance of the modules did not show a clear superiority of a certain technology or technology group over the others. Moreover, the uncertainties in the measurements restrictive the conclusiveness of the results.In the partial shading analysis, the landscape mounting of mc-Si PV-modules in free-field showed a significantly better performance than the portrait one. The cross-table string using CIGS modules did not proved the benefits expected and performed actually poorer than a regular one-string-per-table layout. Parallel substrings with CdTe showed a proper functioning and relatively low losses. Among the two product generations of CdTe analyzed, none showed a significantly better performance under partial shadings.

Outdoor performance of forest seedlings pre-cultivated under artificial lights : effects of the light spectra used for pre-cultivation on the future establishment and development

Forest nurseries are essential for producing good quality seedlings, thus being a key element in the reforestation process. With increasing climate change awareness, nursery managers are looking for new tools that can help reduce the effects of their operations on the environment. The ZEPHYR project, funded by the European Commission under the Seventh Framework Programme (FP7), has the objective of finding new alternatives for nurseries by developing innovative zero-impact technologies for forest plant production. Due to their direct relationship to the energy consumption of the nurseries, one of the main elements addressed are the grow lights used for the pre-cultivation. New LED luminaires with a light spectrum tailored to the seedlings’ needs are being studied and compared against the traditional fluorescent lamps. Seedlings of Picea abies and Pinus sylvestris were grown under five different light spectra (one fluorescent and 4 LED) during 5 weeks with a photoperiod of 16 hours at 100 μmol∙m-2∙s-1 and 60% humidity. In order to evaluate if these seedlings were able cope with real field stress conditions, a forest field trial was also designed. The terrain chosen was a typical planting site in mid-Sweden after clear-cutting. Two vegetation periods after the outplanting, the seedlings that were pre-cultivated under the LED lamps have performed at least as well as those that were grown under fluorescent lights. These results show that there is a good  potential for lightning substitution in forestry nurseries.

Upside Down World -- the Opposition Between Light and Dark in Bulgakov's Master and Margarita

A look at the role that symbolism plays in the novel. In this case, as it is in many other great novels, we see that symbolism is used to enhance the mood and the atmosphere of the novel rather than adding anything of importance to the plot.

LIGHT COVERAGE ON COLBY COLLEGE CAMPUS

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Bleeding: A Collection of Poetry and Short Fiction

Poetry Short Stories

Light Coverage on Colby College Campus

Outdoor lighting is an essential component for nighttime safety on college campuses. Outdoor lighting on Colby College campus is not uniform, leaving some areas with minimal light. The purpose of this project is to analytically evaluate if and where major walkways on Colby College have inadequate lighting. While we were unable to define inadequate lighting, we found that most paths on campus do appear to be well lit, while in general open spaces on campus have the lowest light levels.

March 2001: A Gossamer of Light

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Renegociação de dívidas com múltiplos credores: um estudos de caso da experiência da Light - Serviços de Eletricidade

Esta dissertação analisa o caso prático do processo de renegociação da dívida da Light, durante o período de abril de 2003 até julho de 2005, estabelecendo um paralelo entre essa experiência e alguns modelos teóricos selecionados que discorrem acerca desse tema. Ao final propõe-se um modelo, baseado naqueles existentes, que visa explicar o processo decisório dos credores frente ao menu de contratos de dívidas renegociadas.

A Light, investimento estrangeiro no Brasil: uma luz sobre o ciclo privado-público-privado em 80 anos pela análise de taxa de retorno

A Brazilian Traction, Light and Power Company ("Light"), formada por empreendedores canadenses em 1899, operou por 80 anos praticamente toda a infraestrutura (bondes, luz, telefones, gás) do eixo Rio-São Paulo. A empresa passou por vários ciclos políticos, desde sua fundação até sua estatização em 1979. Durante este período de 80 anos, a infra-estrutura nacional, inicialmente privada, foi gradativamente passando para as mãos do Estado. O setor voltaria a ser privado a partir dos anos 90, configurando o ciclo privado-público-privado, similar ao ocorrido nos países mais desenvolvidos. A Light, símbolo maior do capital estrangeiro até os anos 50, foi inicialmente bem recebida no país, posto que seu desenvolvimento era simbiótico, causa e conseqüência, ao desenvolvimento industrial. Dos anos 20 em diante, crescem os debates econômicos ou ideológicos quanto ao papel do capital privado estrangeiro no desenvolvimento nacional, vis-a-vis a opção do setor público como ator principal. Sempre permaneceu sob névoa quais teriam sido os lucros da Light no Brasil, e se esses seriam excessivos, acima do razoável. Outra questão recorrente se refere até que ponto os congelamentos de tarifas teriam contribuido para a crise de oferta de infra-estrutura. Através de um trabalho de pesquisa em fontes primárias, esta dissertação procura reconstituir a história da Light, sob um foco de Taxa de Retorno sob o capital investido. Foi reconstruída a história financeira da Light no Brasil, a partir da qual calculou-se, para vários períodos e para os seus 80 anos de vida, os retornos obtidos pelos acionistas da empresa. A partir dos resultados obtidos, e utilizando-se de benchmarks comparativos, foi possível mostrar que: i) ao contrário da crença vigente à época, o retorno obtido pelo maior investidor estrangeiro no setor de infra-estrutura do Brasil do Séc. XX, se mostrou bem abaixo do mínimo aceitável, e ii) o represamento de tarifas, por várias décadas, foi de fato determinante para o subdesenvolvimento do setor de infra-estrutura no Brasil.

Uma Análise dos impactos da privatização da Light sob o enfoque da agência reguladora e do consumidor

The objective of this work is identify the impacts of the Light privatization under the consumer point of view, with special focus to the service's quality, verifying the channels introduced by Light to measure the consumer satifaction and evaluate how the consumers interests have influence on the company's decisions. This study also objective to identify the main challenges faced by the Regulatory Agency and the Brazilian State on the new relationship model implementation STATE - CONSUMER - CONCESSIONARY, propoused to the energy sector after the privatization. A descriptive methodology is used to identify the most significant changes on the Light's trasition process to the private administration, followed by an explicative investigation to find how the consumer has passed throught this change, based on bibliographical research and interviews. The obtained conclusions shows that the impacts of the Light privatization under the consumer point of view are positive and highlights that the Regulatory Agency has to have the power and autonomy to control and advice the conncessionaries, building consulte and evaluation mechanisms to activate the consumer participation.

Responsabilidade social da Light e suas contribuições para comunidade: um estudo de caso sobre desenvolvimento humano sustentável, inclusão social e cidadania

Esta dissertação apresenta a responsabilidade social das organizações, mais especificamente as contribuições para a comunidade na qual está inserida, tomando-se como estudo de caso a LIGHT. Elementos concernentes à referida responsabilidade social e ao 'programa de normalização de áreas informais' são analisados por meio da metodologia grounded theory. Desta forma, o objetivo maior do estudo é aumentar o entendimento acerca dos valores substantivos gerados no processo estabelecido entre a organização e a comunidade, na busca pelas dimensões da responsabilidade social e seu relacionamento com desenvolvimento humano sustentável, inclusão social e cidadania