Self Heating
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. "Obtenção de vidros fosfatados contendo Ferro por meio do aquecimento em fornos de microondas" / CHARACTERIZATION OF IRON PHOSPHATE GLASSES PREPARED BY MICROWAVE HEATING
Phosphate glasses have been investigated since the fifties, because they are relatively easy to prepare, have low melting temperatures (1000°C 1200°C), and low glass transition. However, these glasses were very sensitive to humidity, showing a very low chemical durability. Iron phosphate glasses have been prepared by melting inorganic precursors in conv
Publicado em: 2006
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14. Determinação da relação água/cimento utilizando microondas
The relation between water and cement present in the fresh concrete is determinant for the concrete to reach the desired requirements of development: a concrete that would uphold its characteristics, especially mechanical ones during its useful life. Research work indicates that a suitable method for determining this relation is through the heating produced
Publicado em: 2005
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15. "Estudo das resinas acrílicas para bases de próteses totais com relação à resistência flexural, e à quantidade de monômero residual superficial" / Study of acrylic resin for complete denture considering flexural strength and quantity of superficial residual mono mer
The purpose of this work was the evaluation of flexural strength and quantity of superficial residual monomer in acrylic resin for complete denture. To perform both analyses it was developed specimens with a dimension of 2.5mm x 10mm x 65mm. The inclusion process was standardized by the use of plastic flasks reinforced with fiberglass. Seven groups were cons
Publicado em: 2005
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16. Localização de corrente e efeito Joule em manganitas com ordenamento de carga / Current localization and Joule self-heating effects in manganites with charge ordered
Este trabalho contempla um estudo sistemático das propriedades elétricas de óxidos cerâmicos a base de manganês. Ênfase foi dada a sistemas onde uma correlação forte entre os graus de liberdade de carga, spin e rede com ordenamento orbital resultam em um estado fundamental heterogêneo, devido a uma separação de fases. Com esse objetivo, foram prep
Publicado em: 2005
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17. Arc fusion of self-fluxed nickel alloys
Self-fluxed nickel alloys are usually flame fused after thermal spraying. However, due to the practical aspects of high temperatures reached during flame fusing, large structures such as the hydraulic turbines for power generation, can not be efficiently coated. An alternative is to fuse the sprayed coating with a gas tungsten electric arc. In this case, hea
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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18. Projeto de fabricação de HBTs
A process was established for the fabrication in laboratory of Heterojunction Bipolar Transistors (HBTs) with the AIGaAs/GaAs system. The work consisted basically of the study of elementary processing steps. A mask set was designed including devices in different sizes and test structures. With this mask set, the processing steps for HBT fabrication were stud
Publicado em: 1999
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19. Dinamica e reatividade de superficie de poli (dimetilsiloxano)s
Crosslinked polydimethylsiloxane (PDMS) heated at temperatures between 200 and 280°C for short periods (one-half to two hours), reveals a partially thermoplastic behavior. Earlier studies on silicone describe the phenomena occurring under heating as due to chemical reactions leading to the formation of oligomers and oxidation products, which cause degradati
Publicado em: 1994
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20. Modelo termodinamico para o aquecimento não-linear, a laser, e suas aplicações ao processamento de materiais
The subject of the computer modeling of the laser processing of materials continues to be highly topical in Materials Science. Basic to such an achievement was to have an well posed proposition to determine the time evolution of the temperature anywhere in the laser heated sample. Though models of such a kind abound in the literature, they are either rather
Publicado em: 1994
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21. Use of Phospholipid Fatty Acids To Detect Previous Self-Heating Events in Stored Peat
The use of the phospholipid fatty acid (PLFA) composition of microorganisms to detect previous self-heating events was studied in naturally self-heated peat and in peat incubated under temperature-controlled conditions. An increased content of total PLFAs was found in self-heated peat compared to that in unheated peat. Two PLFAs, denoted T1 and T2, were dete
American Society for Microbiology.
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22. Scientists consider meat pie mammography and self heating bathtubs
BMJ Publishing Group Ltd..
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23. A continuous topological change during phase transitions in amphiphile/water systems
Amphiphiles are molecules such as surfactants or lipids that have a polar head group (hydrophilic) attached to nonpolar hydrophobic alkyl chains. Because of this characteristic they self-assemble in water and give rise to a wide range of phases with different structures and properties. Aqueous dispersions of amphiphiles are present in every aspect of day-to-
The National Academy of Sciences.
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24. Planning Hospital Library Quarters: References to Help the Librarian
When a hospital planned an addition that would allow library expansion, the librarian looked into relevant literature for information on what improvements she should request for the new library. Shortly she was reading not for self-instruction alone but also to strengthen her credentials for membership on the planning team. The bibliography which resulted ha