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Thesis (Ph. D.)--University of Hawaii at Manoa, 1996. / Includes bibliographical references (leaves 103-117). / Microfiche. / xiv, 117 leaves, bound ill. 29 cm

[Typescript] Includes bibliography.

Made available in DSpace on 2014-06-11T19:30:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-08Bitstream added on 2014-06-13T21:00:25Z : No. of bitstreams: 1 almeida_r_me_guara.pdf: 1434970 bytes, checksum: a45e1def677af7ba7d2da134164d54f6 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este trabalho aborda o problema de identificação dos efeitos causados por eventuais falhas no abastecimento de certos materiais ou equipamentos na linha de montagem de aeronaves. Tal problema consiste em avaliar se o atraso na disponibilidade de um determinado material pode ser absorvido pela flexibilidade existente na rede de atividades da produção. Dessa forma, foi desenvolvido um sistema de apoio à decisão para o planejamento e controle da produção, utilizando simulação de eventos discretos para avaliar se o sincronismo entre os elos da cadeia produtiva está se comportando a contento e, em caso negativo, disponibilizar informações para as correções necessárias. A grande dificuldade na modelagem do sistema está na necessidade de integração de uma complexa cadeia de suprimentos a uma grande rede de atividades necessárias à manufatura das aeronaves. Apesar da complexidade, o sistema criado é capaz de identificar antecipadamente o impacto causado na montagem pelos insumos atrasados, além de prover uma visão de quais materiais, e respectivos fornecedores, apresentam um atraso que não pode ser absorvido pelo sistema, o que facilitaria o trabalho dos gestores da cadeia de suprimentos para aumentar a robustez do sistema. / This work approaches the effects identification of problems caused by eventual fails in the provisioning of material or equipments in one assembly line of aircrafts. Such problem consists in evaluating if a delay in the availability of a material can be absorbed by the flexibility in the activities network of the production. This way, a decision support system was developed to support the planning and control of the production, using systems simulation, to evaluate if the synchronism among the links of the productive chain is behaving as necessary; in negative case, the system must to provide information for manager’s action. The great difficulty to produce a model of this system is about the necessary integration of a complex supply chain to a big activities network associate to aircrafts manufacture. In spite of that complexity, the system developed is able to identify the impact caused in the assembly line by each late input, providing a vision of which materials, and respective suppliers, have a delay that cannot be absorbed by the production line. So, this research looks for facilitate the manager works in to increase the system robustness.

This investigation, concerning the effects of electricity on nematodes, was conducted in order to find a method of controlling the root-knot nematode in the tobacco field by the use of electricity. The output of a simple induction coil (p. 13 and 37), a 220 Volt 60 cycle current (p. 44), and a 27.12 megacycle transmitter (p. 55) were used to treat the nematodes. Since the nematodes are microscopic, they were treated in the mediums of soil, tap water, distilled water, and distilled water filtered through tobacco soil. The width of the treated area varied trom ½ inch to 12 inches, and the time of treatment varied from 10 seconds to 120 seconds. Two methods were used to determine whether or not the nematodes were killed by the treatments. In the first method (p. 13), the treated soil was planted with okra and tomato seeds which would quickly develop a root system large enough to determine whether or not root-knot infections were present. In the second method (p. 34), the nematode was separated from the and observed in water under a microscope. Results of the treatments were determined more readily by the second method. However, this method required much patience by the operator, and an adequate technique to carry out the second method has not as yet been completely developed. By exposing the nematodes to heat (p. 47) and by comparing the effect of heat alone on the nematodes with the effects of other electrical treatments, it was shown that the heat generated by the electrical treatment provided the lethal effect on the nematodes. An analysis was made of an induction coil showing its output to be AC. An investigation was made to find the conductivity of Granville sandy loam tobacco soil at different moisture levels. The equation Y: 47 x 10⁴ X^-1.29 (10) Y: resistance in ohms X: % of moisture content of the soil shoving the relationship between conductivity and per cent moisture was determined from this test. Because of the scope of this problem of controlling nematodes by electrical means, the author had to conduct only preliminary investigations. However, it is the author's belief that the only way to control nematodes by electricity, and not heat the soil appreciably, is to ionize the chemical in the living cells of the eelworm. To ionize chemicals in the living cells of the nematode would necessitate the application of electrical energy with a frequency high enough to produce x-rays or gamma rays. / M.S.