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Bregolin F.L.,Federal University of Rio Grande do Sul | Behar M.,Federal University of Rio Grande do Sul | Sias U.S.,Federal University of Rio Grande do Sul | Sias U.S.,Instituto Federal Of Educacao Ciencia E Tecnologia Sul Rio Grandense | Moreira E.C.,Federal University of Pampa
Journal of Luminescence | Year: 2011

In the present paper we report structural and photoluminescence (PL) results from samples obtained by Si implantation into stoichiometric silicon nitride (Si 3N 4) films. The Si excess was introduced in the matrix by 170 keV Si implantation performed at different temperatures with a fluence of Φ=1×10 17 Si/cm 2. The annealing temperature was varied between 350 and 900 °C in order to form the Si precipitates. PL measurements, with a 488 nm Ar laser as an excitation source, show two superimposed broad PL bands centered around 760 and 900 nm. The maximum PL yield is achieved for the samples annealed at 475 °C. Transmission electron microscopy (TEM) measurements show the formation of amorphous nanoclusters and their evolution with the annealing temperature. © 2011 Elsevier B.V. All rights reserved. Source

Neitzke R.S.,Prefeitura Municipal de Arroio do Padre | Fischer S.Z.,Instituto Federal Of Educacao Ciencia E Tecnologia Sul Rio Grandense | Vasconcelos C.S.,Federal University of Pelotas | Barbieri R.L.,Embrapa Clima Temperado | Treptow R.O.,Embrapa Clima Temperado
Horticultura Brasileira | Year: 2016

The market for ornamental peppers in Brazil has good growth prospects. However, although the wide genetic variability available in germplasm banks in the country for the development of new cultivars, few commercial cultivars are available. Knowing the needs and preferences of consumers increases the chances of success for new cultivars. The objective of this study was to evaluate the acceptability and preferences by consumers regarding the ornamental peppers from the Capsicum Active Germplasm Bank of Embrapa Temperate Agriculture. Seventeen accessions of ornamental peppers grown in pots were subjected to evaluation by consumers to check their acceptance and preference. Semi-structured interviews were applied individually to 200 people, to determine the perceptions regarding the ornamental peppers, the order of preference and the reason for the choice. Wide diversity for color of immature and mature fruits, fruits shape, size and color of foliage were observed among the accessions with the highest ornamental value. The highest ornamental value was assigned to the plants P28, P119, P180, P254 and P259, genotypes highly promising for development of new ornamental peppers. P28, P119, P180 and P254 produce red ripe fruits and only the accession P259 produces yellow ripe fruits. Shape and size of the fruit were not decisive in the choice of the most ornamental plants by respondents. No difference in the perception of consumers was observed regarding the types of ornamental pepper when considered the stratification by age, education and sex of respondents. The ornamental peppers grown in pots have excellent acceptance by consumers. The greatest preference is for plants showing coloring fruits contrasting to the foliage. © 2016, Sociedade de Olericultura do Brasil. All rights reserved. Source

Fischer S.Z.,Instituto Federal Of Educacao Ciencia E Tecnologia Sul Rio Grandense | Barbieri R.L.,Embrapa Clima Temperado | Peil R.M.N.,Federal University of Pelotas | Stumpf E.R.T.,Instituto Federal Of Educacao Ciencia E Tecnologia Sul Rio Grandense | And 3 more authors.
Horticultura Brasileira | Year: 2015

Family farmers in Rio Grande do Sul State grow landraces of pumpkins that have potential for ornamental use due their wide genetic variability for morphological characteristics. Some of these landraces are conserved in the Cucurbitaceae Active Germplasm Bank of Embrapa Temperate Agriculture. To use this germplasm it is important to characterize it morphologically. Preferences and acceptance of the consumer market can be other useful information. So, this study aimed to verify the acceptance of ornamental pumpkins by the consumer market (consumers and floral designers) and their perception related to ornamental attributes. Therefore, consumers and floral designers were interviewed. They indicated which ornamental traits were preferred and the grade of satisfaction, using an hedonic scale. The morphological fruit traits selected were fruit shape, predominant skin color, skin texture and design formed by the secondary color in the skin. The scale action (Food Action Rating Scale, FACT) is used to verify the acceptance of the fruits. The results were presented as percentages and histograms. A total of 150 consumers and 30 floral designers were interviewed. No significant difference was observed between consumers and floral designers in the perception of aesthetic traits of ornamental pumpkins. The fruits of ornamental pumpkins have great potential for ornamental use and value, with excellent acceptance by consumers with hedonic value around eight. © 2015, Sociedade de Olericultura do Brasil. All rights reserved. Source

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