Spectral Lines
Mostrando 25-36 de 93 artigos, teses e dissertações.
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25. Ensino de física solar em um espaço não formal de educação / Teaching solar physics in an informal educational space
Observatories and planetariums offer the possibility of developing contextualized astronomy teaching by fostering educational activities that provide access to a more authentic school science. Thus, this research consisted in developing, applying and evaluating courses about the Sun for middle, junior high school students and solar physics for high school st
Publicado em: 2009
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26. Simulação de espectros do radical C2* para estudos de combustão / Simulation of C2* radical spectra for combustion studies
The diagnostics of particular species in combustion processes is the key for the development of combustion devices, such as burners, chambers, etc. and also to the understanding of these processes through the study of chemical reaction mechanisms with the aid of mathematical models. One of the diagnostic techniques employed with great success is the emission
Publicado em: 2009
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27. Mapeamento de areas de cafe no municipio de Guaxupe/MG por meio de processamento digital de imagens Landsat / Coffee crop areas mapping in mountain relief through Principals Components Analysis
The economic importance of Brazilian coffee growing in the world market is notorious and makes up significant portion of the country s foreign trade exports. Minas Gerais stands out as the core of Brazilian coffee growing, with most of the planting areas (Coffea arabica) concentrated in the south, where it is grown in small plots widely spread throughout the
Publicado em: 2009
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28. Atividade antiproliferativa de Sloanea garckeana K. Schum.
The crude methanol extract and hexane, ethyl acetate, chloroform and methanol fractions from leaves of S. garckeana were examined in vitro for their antiproliferative activity on MCF-7, NCI-ADR, NCI-460, UACC-62, 786-0, OVCAR-03, PCO-3 and HT-29 human cancer cell lines. Among the assayed fractions, the ethyl acetate fraction showed to be cytotoxic against 78
Química Nova. Publicado em: 2008
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29. Medida da temperatura de íons em um propulsor a plasma do tipo hall via espectroscopia óptica
Spectroscopy is one of the most used techniques concerning the study of plasma, owning particulary to the fact that it is a non-intrusive method. Others plasma diagnostic techniques with emissive probe and energy analyzers perform the desired measurement but interfere in the field configuration as well as in plasma itself provoking plasma cooling and ions re
Publicado em: 2008
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30. Chemical constituents from Tabernaemontana catharinensis root bark: a brief NMR review of indole alkaloids and in vitro cytotoxicity
This work describes the isolation and structural determination of pharmacological compounds present in the bark of roots of Tabernaemontana catharinensis (Apocynaceae). Among the 27 substances detected 12 were identified as terpenoid-indole alkaloids, 2 steroids and 13 pentacyclic triterpenes. Structures were outlined based on HMQC, COSY, DEPT, 13C, and ¹H
Química Nova. Publicado em: 2008
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31. Dímeros flavônicos bioativos de Ouratea multiflora (Ochnaceae)
Chromatographic fractionation of the organic extract from leaves of Ouratea multiflora afforded the flavone dimers heveaflavone, amentoflavone-7¢¢,4¢¢¢-dimethyl eter, podocarpusflavone-A and amentoflavone. Their structures were elucidated from spectral data, including 2D-NMR experiments of the natural su
Revista Brasileira de Farmacognosia. Publicado em: 2007-09
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32. In vitro evaluation of the cytotoxic and trypanocidal activities of Ampelozizyphus amazonicus (Rhamnaceae)
Ampelozizyphus amazonicus Ducke is a tree commonly found in the Amazon region and an extract of its stem bark is popularly used as an antimalarial and anti-inflammatory agent and as an antidote to snake venom. Ursolic acid; five lupane type triterpenes: betulin, betulinic acid, lupenone, 3ß-hydroxylup-20(29)-ene-27,28-dioic acid, and 2a,3ß-dihydroxylup-20(
Brazilian Journal of Medical and Biological Research. Publicado em: 2007-05
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33. Road detection over informal settlements in a suburban area of Sao Paulo city by using high resolution satellite image and a object-based classification approach. / Detecção da malha viária na periferia urbana de São Paulo utilizando imagens de alta resolução espacial e classificação orientada a objetos.
Uncontrolled sprawl occurring in large cities of developing countries requires intensive mapping efforts to update geodatabases. The intense urbanization process experienced since the 70s in Sao Paulo city illustrates very well the reported scenario. Despite aerial data and, more recent, high spatial resolution satellite data which have been employed as basi
Publicado em: 2007
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34. Construction and evaluation of a laser induced breakdown spectroscopy instrument: application in alloy samples / Construção e avaliação de um instrumento para espectroscopia de emissão em plasma induzido por laser (LIBS) : aplicação em ligas metalicas
In this work a time resolved LIBS instrument (TRELIBS) was built and its performance evaluated in qualitative and quantitative analysis. Additionally, exploratory studies are presented on the influence of parameters that affect the LIBS analysis. The instrument was built employing optical systems and devices of modern technology: an ICCD device, an echelle p
Publicado em: 2007
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35. Constituintes químicos de Galianthe brasiliensis (RUBIACEAE)
This paper describes the chemical constituents isolated from aerial parts of the plant Galianthe brasiliensis. From a methanol extract, the iridoid glycosides asperuloside, deacetylasperuloside, mixture of Z- and E-6-O-p-coumaroylscandoside methyl ester, the triterpene ursolic acid and the steroids stigmasterol, campesterol, beta-sitosterol and 3-O-beta-glyc
Química Nova. Publicado em: 2006-06
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36. Experimental study of the bistable flow in tube arrays
Flow through circular cylinder arrays are commonly found in several engineering application as offshore structures, heat exchangers, transmission lines and chimneys, therefore the understanding of the several phenomena that occur due the interaction between flowing fluid and these structures is very important. This work analyzes experimentally the presence o
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-06