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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Analytical approach to feature based process analysis and design

Lee, Jae-Woo. January 1996 (has links)
Thesis (M.S.)--Ohio University, August, 1996. / Title from PDF t.p.
2

Termorregulação em abelhas sem ferrão (Hymenoptera, Apidae, Meliponini): produção ativa de calor e metabolismo energético / Thermoregulation in stingless bees (Hymenoptera, Apidae, Meliponini): active production of heat and energy metabolism

Sbordoni, Yara Sbrolin Roldão 08 June 2015 (has links)
As abelhas sociais são classificadas como animais heterotérmicos, ou seja, podem ser endotérmicas ectotérmicas de acordo com a necessidade do ninho ou do indivíduo. As abelhas sem ferrão eram conhecidas por apresentarem uma termorregulação passiva, onde o invólucro, seria o responsável pela manutenção da temperatura na área de cria. Entretanto, acreditava-se em uma produção de calor ativo como apresentado em abelhas Apis mellifera, embora nunca tenha sido estudado. O objetivo principal do presente trabalho foi verificar a produção de calor ativo por meio das operárias adultas e da cria e relacionar essa produção de calor com a termorregulação passiva e o consumo de oxigênio. Foram utilizadas colônias de abelhas sem ferrão Melipona scutellaris, Frieseomelitta varia e Plebeia droryana mantidas em laboratório. Os resultados obtidos mostraram que a temperatura na área de cria foi sempre maior que na periferia do ninho. Foi verificado que os imaturos produzem calor metabólico e que o invólucro é o responsável pelo isolamento do calor produzido. Além disso, as operárias presentes nas áreas de cria apresentaram temperaturas superficiais torácicas elevadas, sugerindo um incremento na produção de calor na área de cria. Foi observado que as abelhas consomem menos oxigênio quando estão em grupo do que individualmente, sugerindo uma cooperação entre as abelhas ou uma redução de stress em grupo entre as abelhas que pode estar relacionada com a termorregulação colonial. Este trabalho traz novas possibilidades para os estudos de termorregulação, pois confirma a produção de calor ativo em abelhas sem ferrão, até no momento desconhecido / Social bees are classified as heterothermic animals, may be both endothermic and ectothermic according to the necessity of the colony or the individual. The stingless bees are known because the passive thermoregulation, which the involucrum would be responsible for maintenance of the brood area temperature. However, it has been believed in an active heat production as shown in honeybees, although it not studied so far. The aim of the present study was to verify the active heat production through adult workers and brood, and to correlate the heat production with the passive thermoregulation and the oxygen consumption. We used colonies of stingless bees Melipona scutellaris, Frieseomelitta varia and Plebeia droryana maintained in laboratory. Our results showed that the brood area temperature was higher than the nest periphery temperature. We also verified that the immature produces metabolic heat, and that the involucrum is responsible by the isolation of the produced heat. Furthermore, the workers engaged on the brood area had their thoracic surface temperatures higher than other workers, which suggest the increasing of the heat production in the brood area. Bees consumed less oxygen in group than when they are individually tested. This study brings new possibilities to the thermoregulation studies, because it confirms the active heat production in stingless bees
3

A low temperature differential stirling engine for power generation : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering in the University of Canterbury /

Lloyd, Caleb C. January 2009 (has links)
Thesis (M.E.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (leaves 106-109). Also available via the World Wide Web.
4

Termorregulação em abelhas sem ferrão (Hymenoptera, Apidae, Meliponini): produção ativa de calor e metabolismo energético / Thermoregulation in stingless bees (Hymenoptera, Apidae, Meliponini): active production of heat and energy metabolism

Yara Sbrolin Roldão Sbordoni 08 June 2015 (has links)
As abelhas sociais são classificadas como animais heterotérmicos, ou seja, podem ser endotérmicas ectotérmicas de acordo com a necessidade do ninho ou do indivíduo. As abelhas sem ferrão eram conhecidas por apresentarem uma termorregulação passiva, onde o invólucro, seria o responsável pela manutenção da temperatura na área de cria. Entretanto, acreditava-se em uma produção de calor ativo como apresentado em abelhas Apis mellifera, embora nunca tenha sido estudado. O objetivo principal do presente trabalho foi verificar a produção de calor ativo por meio das operárias adultas e da cria e relacionar essa produção de calor com a termorregulação passiva e o consumo de oxigênio. Foram utilizadas colônias de abelhas sem ferrão Melipona scutellaris, Frieseomelitta varia e Plebeia droryana mantidas em laboratório. Os resultados obtidos mostraram que a temperatura na área de cria foi sempre maior que na periferia do ninho. Foi verificado que os imaturos produzem calor metabólico e que o invólucro é o responsável pelo isolamento do calor produzido. Além disso, as operárias presentes nas áreas de cria apresentaram temperaturas superficiais torácicas elevadas, sugerindo um incremento na produção de calor na área de cria. Foi observado que as abelhas consomem menos oxigênio quando estão em grupo do que individualmente, sugerindo uma cooperação entre as abelhas ou uma redução de stress em grupo entre as abelhas que pode estar relacionada com a termorregulação colonial. Este trabalho traz novas possibilidades para os estudos de termorregulação, pois confirma a produção de calor ativo em abelhas sem ferrão, até no momento desconhecido / Social bees are classified as heterothermic animals, may be both endothermic and ectothermic according to the necessity of the colony or the individual. The stingless bees are known because the passive thermoregulation, which the involucrum would be responsible for maintenance of the brood area temperature. However, it has been believed in an active heat production as shown in honeybees, although it not studied so far. The aim of the present study was to verify the active heat production through adult workers and brood, and to correlate the heat production with the passive thermoregulation and the oxygen consumption. We used colonies of stingless bees Melipona scutellaris, Frieseomelitta varia and Plebeia droryana maintained in laboratory. Our results showed that the brood area temperature was higher than the nest periphery temperature. We also verified that the immature produces metabolic heat, and that the involucrum is responsible by the isolation of the produced heat. Furthermore, the workers engaged on the brood area had their thoracic surface temperatures higher than other workers, which suggest the increasing of the heat production in the brood area. Bees consumed less oxygen in group than when they are individually tested. This study brings new possibilities to the thermoregulation studies, because it confirms the active heat production in stingless bees
5

Microarray Analysis Of The Effects Of Heat And Cold Stress On Hydrogen Production Metabolism Of Rhodobacter Capsulatus

Gurgan Dogan, Muazzez 01 September 2011 (has links) (PDF)
Rhodobacter capsulatus DSM1710 is a purple non-sulfur bacterium capable of hydrogen production via photofermentation. Biohydrogen is a clean and renewable way of hydrogen production, which can be achieved by PNS bacteria in outdoor large scale photobioreactors using sun light. In outdoor conditions bacteria can be exposed to heat and cold stress. In this study in order to understand the effects of heat and cold stress on photofermentative hydrogen production and gene expression profile of R.capsulatus on acetate as the carbon source, microarray analysis was carried out. Since there is no commercially available microarray chip for R.capsulatus, an Affymetrix GeneChip&reg / was designed and it was manufactured by Affymetrix.The experiments were conducted at 30
6

Kombinovaná výroba tepla a elektrické energie / The combined production of heat and electricity

Talač, Michal January 2014 (has links)
This thesis describes the design of a cogeneration unit, its design and operational optimization. The theoretical part explains the principles of cogeneration and the associated advantages and disadvantages, also describes the different types of units and their main components and their suitability for use in various types of buildings. The second part of this thesis deals with a design of cogeneration unit in selected building. Design of cogeneration unit consists of evaluation of the object itself, through the selection of suitable units, optimalization of a selected range of cogeneration units, to the final financial analysis. The part of the thesis are also project drawings, which shows the current status of the heating system and subsequently scheme with the possible involvement of cogeneration units in the existing system.
7

Разработка технологии производства теплоизоляционных материалов для металлургической промышленности на основе сырья Уральского региона : магистерская диссертация / Development of technology of production of thermal insulation materials on the basis of raw materials of the Ural region for the metallurgical industry

Глызина, А. Э., Glyzina, A. E. January 2018 (has links)
The dissertation is devoted to the study of the properties of diatomite of the Ilyinsky Deposit for the purpose use it in the production of heat-insulating mixtures (HIM). These mixtures are used to reduce heat losses from the metal surface during casting. The technology of production of a heat-insulating mixture on the basis of Ilyinsky diatomite is developed. Efficiency of its application is shown. / Исследование посвящено изучению свойств диатомита Ильинского месторождения с целью применения его в производстве теплоизолирующих смесей. Эти смеси применяют для снижение тепловых потерь с поверхности металла при его разливке. Разработана технология производства теплоизолирующей смеси на основе ильинского диатомита и показана эффективность его применения.

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