Nova proposta de critério de retenção para dimensionamento de filtros têxteis

The designs of filters made by granular material or textile are mainly based on empirical or semi empirical retention criteria according to Terzaghi proposal, which compares particle diameter of the soil base with the filter porous spaces. Silveira in 1965, proposed one rational design retention criteria based on the probability of a particle from the soil base, carried by one dimensional flow, be restrained by the porous of the filter while trying to pass through its thickness. This new innovating theory, besides of being very simple, it is not frequently used for granular filters since the necessary parameters for the design has to be determine for each natural material. However, for textile this problem no longer exists because it has quality control during manufacturing and the necessary characteristics properties of the product are specify in the product catalog. This work presents one adaptation of the Silveira theory for textile filters and the step-by-step procedure for the determination of the characteristics properties of the textile products necessary for the design. This new procedure permits the determination of the confiability level of retention that one specific particle diameter form the soil base has for one specified textile. One complete example is presented to demonstrate the simplicity of the method proposed and how the textile characteristics are obtained.

Reformulação para um problema integrado de dimensionamento e sequenciamento de lotes

In this paper, some new constraints and an extended formulation are presented for a Lot Sizing and Scheduling Model proposed in the literature. In the production process considered a key material is prepared and is transformed into different final items. The sequencing decisions are related to the order in which the materials are processed and the lot sizing decisions are related to the final items production. The mathematical formulation considers sequence-dependent setup costs and times. Results of the computational tests executed using the software Cplex 10.0 showed that the performance of the branch-and-cut method can be improved by the proposed a priori reformulation.

Avaliação de riscos ambientais no Aeroporto Internacional de Viracopos, Campinas (SP)

Considering the current context of environmental concern, the main purpose of this research was to develop and apply indicators to evaluate the environmental risk for airports. As a result, 19 indicators related to storage and handling dangerous substances were created. These indicators represent five conditions varying from the worst (level 1) to the ideal condition (level 5). The indicators were applied, as a study of case, at Viracopos International Airport, Campinas (SP). The results showed a medium performance of 2.3, using a scale raging from 1.0 to 5.0, characterized as 'critical'. Then, the indicators were analyzed to determine the major weaknesses related to the environmental management at Viracopos International Airport, as well as to identify good practices and solutions. Among the suggested management strategies, we highlight the suitability of areas for storage of dangerous substances. In general, it can be inferred that the indicators proposed in this paper to evaluate the performance in the management of environmental risks at the Viracopos International Airport and propose actions to prevent, monitor, correct, and mitigate the environmental impacts of its operations.

Indicadores para a gestão de resíduos sólidos em aeroportos e sua aplicação no Aeroporto Internacional de Viracopos, Campinas, São Paulo

Taking into account the current context about environmental concern, the main purposes of this research were to develop and apply indicators in order to evaluate waste residues management in airports. As a result, 17 indicators related to generation, storage, transportation, collection, and solid waste disposal were created. These were applied in Viracopos International Airport, in Campinas, São Paulo State, Brazil. The results obtained in the study had a 2.9 performance, in a scale from one to five, characterized as regular. Posteriorly, the main weaknesses in waste residues management were analyzed in such Airport, as well as good practices and solutions were identifed. The highlighted management strategies suggested were the adjustment of areas for waste storage, recycling, and residues composting.

Modelos matemáticos para problemas de dimensionamento de lotes com restrições de capacidade e custos de transporte

In this paper, capacitated lot sizing problems in which the classical lot sizing decisions are made considering the transportation costs of the manufactured products were studied. These costs are related to the necessary number of pallets or trucks to pack and/or transport the products from the factory to the warehouse. Three extensions of a mixed integer linear programming model from the literature are considered, representing general cases that are commonly found in companies. These models are tested and evaluated using an optimization package, and a Lagrangian heuristic was developed for one of the extensions proposed.

Modelos matemáticos para o problema integrado de dimensionamento de lotes e corte de estoque undimensional

Pós-graduação em Matemática - IBILCE

Limitantes inferiores par ao problema de dimensionamento de lotes em máquinas paralelas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Reformulações e relaxação Lagrangiana para o problema de dimensionamento de lotes com várias plantas

Pós-graduação em Matemática - IBILCE

Modelagem para dimensionamento de tanque de escorva para instalações de bombeamento utilizando a Lei de Boyle

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento de sistema computacional para pré-dimensionamento de turbinas para micro, mini e pequenas centrais hidrelétricas

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Modelo de software livre para dimensionamento hidráulico de pivô central

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Modelo computacional para dimensionamento de tratores, equipamentos e operações agrícolas

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Metodologia para avaliação de desempenho ambiental em aeroportos e sua aplicação no Aeroporto Internacional de Viracopos, Campinas (SP)

Pós-graduação em Geologia Regional - IGCE

Dimensionamento da linha lateral utilizando dois espaçamentos entre gotejadores

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Comparação econômica entre critérios de dimensionamento de sistemas de irrigação por microaspersão utilizando modelos de programação linear

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA