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| Tarfaoui, Mostapha; Gning, P.b.; Davies, Peter; Collombet, F. |
| The impact behavior of composite materials has been extensively studied but interest has been centered on flat plates. For underwater applications, thick composite cylinders are employed and several questions must be addressed concerning the influence of accidental impact. The aim of this work is to study the dynamic response of tubular structures. Such structures find many applications but the damage upon impact is not taken into account during their dimensioning. However, at the time of their handling or in service the damage introduced by accidental impact can compromise their capacity to fulfill their function. The cylinders are thick and consist of epoxy matrix and glass fiber reinforcement. After having observed the nature of the damage related to... |
| Tipo: Text |
Palavras-chave: Size effect; Scale effect; Damage; Impact; Filament winding. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2458.pdf |
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| Santos, Fernando Antonio Agra; Faria, Roberto Araujo de; Teixeira, Erly Cardoso. |
| This work analyzes the changes in area under cultivation that occurred between 1985 and 1995/1996 in the meso-regions Triângulo Mineiro/Alto Paranaíba and Zona da Mata in the state of Minas Gerais, Brazil. The analysis was conducted in two methodological stages. First, variation in the area under cultivation for a particular crop was disaggregated into variation due to change in regional agricultural scale and variation due to the substitution effect. Second, an econometric model of the crop that had the greatest growth in cultivated area and highest substitution effect index was developed to identify the main factors responsible for these high figures. It is observed that the area under rice cultivation was reduced in all regions, a fact related to the... |
| Tipo: Journal Article |
Palavras-chave: Agricultural composition; Scale effect; Substitution effect.; Agribusiness. |
| Ano: 2008 |
URL: http://purl.umn.edu/61226 |
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