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- 저자 : Fernando Mendes (검색결과 2 건)
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Unbalanced wind buffeting effects on bridges during double cantilever erection stages
Mendes, Pedro A.,Branco, Fernando A. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.1
This paper is focused on the torsional effects that are induced on bridge piers by unbalanced wind buffeting on the deck during double cantilever erection stages. The case of decks with variable cross section is considered in particular as this characteristic is typical of most frame bridges that are built by the cantilever method. The procedure outlined in the paper is basically an application of the method that Dyrbye and Hansen (1996) have illustrated for decks with constant cross section. This format was chosen because it is suitable for design purposes and may easily be implemented in structural codes. As a complement, the correspondence with the format that is adopted in the Canadian code (NBCC 1990) for the gust factor is established, which might be useful to bridge designers used to the North-American approach to the gust effects on structures. Only alongwind turbulence and horizontal movements of the deck are considered. The combination of torsional and bending effects is also discussed and it is illustrated with an example of application.
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Commercial catalysts screening for the direct amination of cyclohexanol
Rui Churro,Fernando Mendes,Paulo Araújo,Luís M. Madeira,Filipa Ribeiro 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
Two groups of commercially available Ni- and Pd-based catalysts were used for the direct amination ofcyclohexanol (CHOL) with NH3 as aminating agent and in the presence of H2, aiming the selectiveproduction of cyclohexylamine (CHA) and aniline. The fresh catalysts were characterized in terms ofmetal loading, support composition (prevailing SiO2 and Al2O3) and metallic dispersion. Ni-basedcatalysts revealed to be highly active while Pd-based were more selective towards aniline, howeverrequiring higher temperatures and catalyst loading to reach significant CHOL conversions (from 17 up to67 %). The activity of the catalysts is intrinsically related to their metallic dispersion regardless the metalloading. The Ni-based catalyst with 46 wt. % of Ni is the most promising once it presents higher turnoverfrequency (TOF) values, as 10 fold high, particularly related to the ratio of desired to undesired by-products. Moreover, operating conditions considerably affect catalysts’ performance.
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