Accelerated Testing
Mostrando 25-36 de 55 artigos, teses e dissertações.
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25. Mobile linear traffic simulator method to forecast behavior and performance of asphalt pavements. / Método de uso de simuladores de tráfego linear móvel de pista para a determinação de comportamento e previsão de desempenho de pavimentos asfálticos.
Full-scale accelerated pavement testing is defined as the controlled application of a wheel load in a pavement structure to determine the pavement system response and its performance under accelerated conditions of accumulated damage in a compressed time period (METCALF, 1996). Loads at or above the legal maximum allowed by highway agencies can be applied at
Publicado em: 2008
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26. STUDY OF HMS-PP (HIGH MELT STRENGTH POLYPROPYLENE) BEHAVIOUR UNDER CONDITIONS OF ENVIRONMENTAL AND ACCELERATED DEGRADATION / Estudo do comportamento de HMS-PP (polipropileno com alta resistência do fundido) sob condições de degradação ambiental e acelerada
The behaviour study of polymeric materials concerning the weathering (heat, uv light, moisture, high-energy radiation, chemical attack and pollutants) is of fundamental importance to assess the stability of the material. The thermoplastics evaluated were the stabilized and not stabilized HMS-PP synthetized by gamma (g) irradiation under acetylene atmosphere.
Publicado em: 2008
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27. Fadigue reliability analusis : case study automotive suspension control arm / Analise de confiabilidade em fadiga : estudo de caso : braço de controle de suspensão automotiva
This dissertation aims at describing a procedure for approval of a suspension control arm subjected to high-cycle fatigue and, simultaneously, at proposing a validation alternative method based on reliability concepts and statistical theories. In that manner, the research provides not only an assessment of the procedure followed by the manufacturer, but also
Publicado em: 2008
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28. Concreto projetado elaborado com cimentos especiais: análise segundo parâmetros de durabilidade. / Shotcrete elaborated with especial cements: analisys according to durability parameters.
The present work involves an experimental study with dry-mix shotcrete aiming at the behavior analysis, through indicative testing of the main durability parameters of national and international specifications. The research involves the use of four cement types especially formulated for use in shotcrete use in comparison with two other cements that are tradi
Publicado em: 2007
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29. Ensaios acelerados de pavimentos para avaliação de desempenho de recapeamentos asfálticos / Accelerated pavement testing to evaluate the performance of asphalt overlays
Esta dissertação apresenta uma avaliação da eficiência de um recapeamento constituído por mistura de asfalto-borracha (processo via-úmida), no retardamento de reflexão de trincas, através da técnica de ensaios acelerados. Para a realização do estudo foi construído um pavimento experimental com camada final de terraplenagem de argila arenosa de c
Publicado em: 2007
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30. RESISTÊNCIA NATURAL DE SEIS ESPÉCIES DE MADEIRAS DA REGIÃO AMAZÔNICA A FUNGOS APODRECEDORES, EM ENSAIOS DE LABORATÓRIO
RESUMO O presente trabalho avaliou a resistência natural das madeiras de Aspidosperma desmanthum (Araracanga), Parinari excelsa (Parinari), Mouriri callocarpa (Miraúba), Marmaroxylon racemosum (Angelim-rajado), Peltogyne paniculata (Roxinho) e Astronium sp. (Muiracatiara) aos fungos causadores de podridão-branca Pycnoporus sanguineus e podridão-parda Glo
Ciênc. Florest.. Publicado em: 2006-03
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31. Desenvolvimento de formas lipossomais contendo levana
The present study proposes the manufacture of liposomes containing levan as an antitumor and immunomodulator for the cancer therapy. Levan-loaded liposomes (Lev-LIPO) were prepared according to the thin film formed method. Physicochemical characterization was performed immediately after their preparation. Additionally, both accelerated and long-term stabilit
Publicado em: 2006
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32. Estimativa da confiabilidade dos sensores Ãpticos de pressÃo e temperatura nas condiÃÃes de uso a partir de testes acelerados de vida
Because of the competitor market on oil exploration the companies of the sector have researched big assaulting on new technologies which the aim is obtain a more stimulate activities and a better management of the oilâs production. To have a more accurate notion of the productionâs potential, these companies have invested in the development and in the util
Publicado em: 2005
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33. ObtenÃÃo, caracterizaÃÃo e avaliaÃÃo microbiolÃgica de uma nova forma farmacÃutica contendo hidroquinona
Hydroquinone (HQ) is a drug reported to possess manifold biological activities, such as depigmenting, antimicrobial and antitumour properties. The PluronicLecithin Organogel (PLOme) is a phospholipidic microemulsion particularly implied when a high cutaneous permeability and systemic absorption of a drug is suitable. Once that HQ is highly unstable i
Publicado em: 2003
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34. Ensaios acelerados : uma nova metodologia
This work proposes a new methodology for Accelerated Testing based on the Weibull distribution. The development of a general Accelerating Function that has more accurancy then the procedures actually in use. Particular cases of this Accelerating Function give us the theorical model of some methods. A generation of a computer program, called ATP, calculate th
Publicado em: 1994
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35. Evaluation of an Accelerated Protocol for Detection of Extended-Spectrum β-Lactamase-Producing Gram-Negative Bacilli from Positive Blood Cultures
We evaluated a protocol for the accelerated detection of extended-spectrum β-lactamases (ESBLs) in gram-negative bloodstream pathogens. Two hundred eighty-three blood culture bottles were subjected to direct ESBL testing by inoculating samples directly from blood culture bottles onto agar plates containing cefotaxime and ceftazidime disks, with and without
American Society for Microbiology.
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36. Quantitative Limulus lysate assay for endotoxin and the effect of plasma.
The effects of plasma and chromogenic substrate on the kinetics of the endotoxin-activated Limulus amoebocyte lysate (LAL) assay were determined. A linear correlation was observed between the rate of development of turbidity (optical density 405) with the LAL reagent and the concentration of endotoxin over a four log ten-fold range. Like chromogenic substrat