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RISS 인기검색어
- 검색키워드
- 저자 : Gilberto Torres (검색결과 2 건)
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Ignacio Cuauhtémoc,Gilberto Torres,Juan Navarrete,Carlos Angeles-Chavez,Juan Manuel Padilla,Gloria Del Angel 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
Rhodium supported catalysts were prepared by impregnating γ-Al2O-Ce supports, which were prepared from boehmite and cerium nitrate with different cerium contents (1, 5, 10 and 20 Ce wt%). High specific surface areas, which diminish with the cerium content, were obtained. At high cerium contents the X-ray Diffraction (XRD) patterns showed the characteristic peaks of cerium oxide. X-ray photoelectron Spectroscopy (XPS) identified the presence of Rho and Rhδ+ on the catalysts. The analysis of the Ce 3d region showed the presence of Ce3+ and Ce4+ where their relative abundance depends on the cerium content. Small rhodium particle sizes were determined by High Angle Annular Dark Field (HAADF) Scanning Transmission Electron Microscopy (STEM). It has been found that the conversion for the wet oxidation of methyl tert-butyl ether (MTBE) depends on the cerium content; conversion ranging from 73 to 96% were reached. A correlation between the total mineralization of MTBE and the relative abundance of the Ce4+/Ce3+ ratio was observed. A total mineralization, as high as 87%, was obtained in the catalyst with the highest Ce4+/Ce3+ ratio. Rhodium supported catalysts were prepared by impregnating γ-Al2O-Ce supports, which were prepared from boehmite and cerium nitrate with different cerium contents (1, 5, 10 and 20 Ce wt%). High specific surface areas, which diminish with the cerium content, were obtained. At high cerium contents the X-ray Diffraction (XRD) patterns showed the characteristic peaks of cerium oxide. X-ray photoelectron Spectroscopy (XPS) identified the presence of Rho and Rhδ+ on the catalysts. The analysis of the Ce 3d region showed the presence of Ce3+ and Ce4+ where their relative abundance depends on the cerium content. Small rhodium particle sizes were determined by High Angle Annular Dark Field (HAADF) Scanning Transmission Electron Microscopy (STEM). It has been found that the conversion for the wet oxidation of methyl tert-butyl ether (MTBE) depends on the cerium content; conversion ranging from 73 to 96% were reached. A correlation between the total mineralization of MTBE and the relative abundance of the Ce4+/Ce3+ ratio was observed. A total mineralization, as high as 87%, was obtained in the catalyst with the highest Ce4+/Ce3+ ratio.
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Influence of laser peening on fatigue crack initiation of notched aluminum plates
Vignaud Granados-Alejo,Carlos Rubio-Gonzalez,Yazmin Parra-Torres,J. Antonio Banderas,Gilberto Gómez-Rosas 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.6
Notches such as slots are typical geometric features on mechanical components that promote fatigue crack initiation. Unlike for components with open hole type notches, there are no conventional treatments to enhance fatigue behavior of components with slots. In this work we evaluate the viability of applying laser shock peening (LSP) to extend the fatigue life of 6061-T6 aluminum components with slots. The feasibility of using LSP is evaluated not only on damage free notched specimens, but also on samples with previous fatigue damage. For the LSP treatment a convergent lens was used to deliver 0.85 J and 6 ns laser pulses 1.5 mm in diameter by a Q-switch Nd: YAG laser, operating at 10 Hz with 1064 nm of wavelength. Residual stress distribution was assessed by the hole drilling method. A fatigue analysis of the notched specimens was conducted using the commercial code FE-Safe and different multiaxial fatigue criteria to predict fatigue lives of samples with and without LSP. The residual stress field produced by the LSP process was estimated by a finite element simulation of the process. A good comparison of the predicted and experimental fatigue lives was observed. The beneficial effect of LSP in extending fatigue life of notched components with and without previous damage is demonstrated.
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