Orientador: Maurício Dutra Zanotto / Banca: Sérgio Gonçalves Dutra / Banca: Tiago Zoz / Banca: Marcelo de Almeida Silva / Banca: João Paulo Teixeira Whitaker / Resumo: O óleo da mamona (Ricinus communis) possuí inúmeras aplicações na área industrial e na produção de biodiesel, demonstrando assim sua importância econômica. O Brasil é o quarto maior produtor mundial de óleo de mamona com grande potencial para ser protagonista na produção de mamona, sendo a utilização de híbridos uma alternativa para tal fim, contudo existe dificuldade da obtenção devido às variações climáticas. Assim, o presente trabalho teve por objetivo a construção de uma câmara de crescimento, para simular diversas condições climáticas para auxiliar na seleção de plantas, além de utilizar essa câmara de crescimento para avaliar o efeito isolado da alta temperatura na reversão sexual da mamona. Para criação da câmara de crescimento foram utilizadas lâmpadas, ar condicionado, aquecedores e sensores; além de um Arduino Mega 2560 R3, que controla todo o sistema. Durante esse experimento, foram feitas avaliações quanto à intensidade luminosa requerida para o total desenvolvimento das plantas de mamona. Nessa mesma câmara de crescimento, foi realizado o experimento do efeito isolado da alta temperatura com relação à taxa de flores masculinas e femininas no híbrido FCA 2007-1 e na reversão sexual sobre as fêmeas MRZ 14. O delineamento experimental utilizado para avaliar a taxa de flores entre masculina e feminina do híbrido FCA 2007-1 foi de blocos ao acaso, em parcelas subdivididas com três repetições. As parcelas foram constituídas pelo número de dias após a emergência em que ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Castor oil (Ricinus communis) is present in many industrial applications and in the production of biodiesel, demonstrating its economic importance. Brazil is the fourth largest castor oil producer in the world with great potential to be a protagonist of castor bean, and the use of hybrids is an alternative for this purpose, however there is difficulty in obtaining it due to climatic variations. So, the aim of the present work was the construction of a growth chamber, in which it simulates various climatic conditions to aid in the selection of plants, besides using this growth chamber to evaluate the isolated effect of high temperature on the castor's sexual reversion. To create the growth chamber were used lamps, air conditioning, heaters and sensors; plus, an Arduino Mega 2560 R3, which controls the entire system. During this experiment, evaluations were made to know how much light intensity is required for the full development of castor bean plants. In this same growth chamber, the isolated high temperature effect experiment was performed in relation to male and female flowers rate in the FCA 2007-1 hybrid and in the sexual reversion on MRZ females 14. The experimental design used to evaluate the flower rate between male and female in the FCA 2007-1 hybrid was a randomized block design with split-plots with three replicates. The plots consisted of the days after the emergence of the plants, when the high temperature stress (14, 21, 28 and 35 days) was started, and the sub-p... (Complete abstract click electronic access below) / Doutor

One of the major causes of structural repairs worldwide is the corrosion of reinforced concrete structures, such as residential buildings and piers, which are exposed to harsh marine environments. This investigation aims to provide experimental evidence of the fire resistance of corroded high strength reinforced concrete. For this, 14 reinforced concrete beams of three different concrete mix designs (different strengths) were prepared along with concrete cylinders for compression strength testing (ASTM C39). After proper moist curing, all beams were corroded, in two phases, with impressed current, then “crack scored ”for corrosion evaluation, after which half were exposed to fire, also in two phases, following the ASTM E-119-12 time-temperature curve, using a gas kiln. The fire damage was evaluated and compared between phases by using Ultrasonic Pulse Velocity technology. Finally, all specimens were tested for flexural strength by using the third-point loading method (ASTM C78) and the effects of fire on the corroded beams were analyzed according to the level of corrosion. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2014. / FAU Electronic Theses and Dissertations Collection

"June 2001." Includes bibliographical references (leaves 217-248). The effects of a sustained period of moderately high temperature on physiological and biochemical aspects of grain development were investigated in wheat cultivars grown under controlled environment conditions. The effect of variation in plant nutrition on the responses of cultivars to high temperature was also studied.

Short periods ( up to 5 days ) of high temperatures have been shown to reduce grain weight in barley although the specific effects on malting quality are still not clearly understood. Controlled environment conditions were used in this study to investigate the physiological and biochemical responses in Schooner barley to 5 days of elevated temperatures during grain filling. Control plants were maintained at 21 / 16 ° C ( 14th day ) from anthesis to harvest ripeness. Plants undergoing heat treatment experienced increasing temperatures for two days ( from 16 days after anthesis ) followed by 3 days at high temperatures (35 ° C day / 25 ° C night ). The period of high temperature reduced individual grain dry weight by 18 %. Schooner barley endosperm ( the grain storage tissue ) exhibited greater sensitivity to high temperatures than the whole grain ( 25 % reduction in dry weight ) in response to high temperatures. Grain development was accelerated by exposure to high temperatures and a reduction of approximately 8 % in the duration of grain filling was observed in heat treated compared with control grain. Changes in endosperm composition provided evidence that exposure to high temperatures altered overall grain metabolism. Reduction in starch, the single most important grain component contributing to final grain weight was the major factor lowering final grain dry weight, b - glucan deposition was also reduced following high temperature exposure. Little change was observed in the absolute amount of nitrogen accumulated per endosperm, although nitrogen concentration was higher in heat - treated grain, due mainly to reduced grain size and lower starch content. The results of this study confirmed other reports that the conversion of sucrose to starch was limiting in grain exposed to a period of high temperature. The amount of substrate, sucrose, within heat treated endosperms was not found to be limiting starch accumulation. The reduction in starch synthesis appeared to result from the combined effects of diminished catalytic activity of several enzymes in the committed pathway of starch synthesis and / or delayed recovery of enzyme activity during the cooler conditions which followed the heating period. Soluble starch synthase ( SSS ) showed an immediate loss of catalytic activity, even at moderate temperatures, while sucrose synthase and uridine 5 ' - diphosphoglucose pyrophosphorylase showed greatest reduction in activity only after plants were returned to cooler conditions. Individual enzymes showed variation in the level of recovery under the cooler temperature conditions which followed the heating period. The high temperature conditions which induced changes in the metabolism of grains following high temperature exposure, were associated with alterations to the appearance of the starchy endosperm cells, including the distribution of starch granules and their growth. Under elevated temperatures the synthesis of endosperm starch did not appear to keep pace with cell division and cell enlargement and peripheral endosperm cells remained relatively empty of starch granules. A reduction in Calcofluor fluorescent cell wall material was observed in both the endosperm and the crushed cell layer of heat treated grains. Microscopic observations revealed that the lower levels of starch observed in heat treated barley grains were not only associated with reduced accumulation of starch, but also localised degradation of the barley endosperm. Increased embryo growth, which was observed to take place in heat treated grains, may have been due to the nutrients thus generated although further investigations are required to elucidate the mechanisms involved. Structural observations of harvest ripe grain developing under control conditions also revealed changes in the grain associated with early germination events, and the possibility of a continuum between development and germination has been put forward. High temperature exposure resulted in an overall decrease in malt extract potential, but there was evidence that the effects of heat on individual malt parameters were both beneficial and detrimental. While DP, beta - amylase deposition, beta - glucan and viscosity were improved, heat treatment was associated with a reduced quantity of starch and increased protein concentration. Grain and malt beta - glucan levels were reduced as a result of high temperature exposure and beta - glucan degradation was enhanced in these grains. The overall reduction in the amount of ' maltable ' grain ( due to reduced grain size ) represented one of the most significant effects of heat treatment. The effects of a period of high temperature on grain growth and subsequent malting quality were examined for barley varieties Schooner and Arapiles and advanced breeding line WI - 2875 * 22. All showed reduced final grain dry weight in heat treated grains but the response to high temperature exposure with respect to starch, protein and ( b - glucan accumulation varied. The continued synthesis of starch by Arapiles and WI - 2875 * 22 under high temperature conditions warrants further investigation. Evidence has also been presented indicating that water loss may not have a decisive role in the termination of grain filling. The effect of high temperatures on the non - endosperm component of the grain showed both genotypic and environmental variation. Changes in the contribution made by the non - endosperm component to final grain weight was observed to lead to alterations in the relative concentration of important grain storage components. This was found to be crucial where potentially important heat stable quality characteristics, such as reduced accumulation of nitrogen, were masked by changes in the contribution to final grain dry weight by the non - endosperm component of the grain. / Meredith Anne Blesing Wallwork / Thesis (Ph.D.)--Department of Plant Science, 1997.

Bibliography: leaves 151-187. / xvii, 187 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Agriculture and Natural Resource Sciences, 1993

"June 2001." / Includes bibliographical references (leaves 217-248). / vi, 248 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The effects of a sustained period of moderately high temperature on physiological and biochemical aspects of grain development were investigated in wheat cultivars grown under controlled environment conditions. The effect of variation in plant nutrition on the responses of cultivars to high temperature was also studied. / Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Science, 2001?

Bibliography: leaves 151-187.

Bibliography: leaves 174-192. This research aims to obtain detailed knowledge on the effects of a period of high temperature on the accumulation of grain dry matter and endosperm starch, protein and B-glucan in the developing grain of the malting barley variety Schooner. Bbarley plants are exposed to high temperatures during mid grain filling for 5 days. Grain growth characteristics are measured prior to, during and following the high temperature period, with the aim of characterising the high temperature response in developing grain. The activities of several enzymes and metabolities of the pathway of starch synthesis are monitored and compared to those in grains maintained at a lower temperature. In addition, grain structure is also compared between control and heat treated grain during development, at maturity and following malting.

Due to the aluminum industry demands, a large effort has recently been devoted to the development of special alloys to be used as inert anodes for a newly designed aluminum reduction cell. The implementation of this new technology aims at the replacement of the graphite anodes that have been used for over 100 years in aluminum smelting, which would reduce fossil carbon consumption, and eliminate the emission of carbon dioxide and of perfluorocarbons. Ternary alloys containing copper, nickel, and iron have been the subject of the research activities. The present research focused on the stability of the Cu-Ni-Fe alloys at high temperatures in oxidizing and fluoridating environments. The experimental methods included thermodynamic calculations of the phase diagram ('Thermocalc'), optical microscopy and microprobe microstructural and chemical investigations (EMIPA-WDS), small-angle neutron scattering (SANS), differential thermal analysis (DTA), and air-oxidation studies. The results have led to the optimization of the Cu-Ni-Fe ternary phase diagram and to an extensive study of the thermodynamics and kinetics of the spinodal decomposition and discontinuous reactions occurring during ageing as a function of alloy composition. The oxidizing reactions occurring in air at high temperatures at the surface of the alloys have been also discussed in terms of thermodynamic and kinetic laws. The phase formation in a fluorine containing environment as encountered in an aluminum electrolytic cell is predicted using principles of physical chemistry. / Graduation date: 2004 / Best scan available. Figures in original document are very dark and have a moray pattern.

Graduation date: 1998