Influence of the Deposition Method on the Characteristics of ZnO Films for Photocatalytic Applications S.P. Cotinho, R.T. Bento, D.R. Dos Santos, O.V. Correa, M.F. Pillis Materials Research, 2025 Contaminants of emerging concern have received considerable attention due to their potential adverse effects on aquatic systems, flora, fauna, and human health. Azo dyes represent a significant category of toxic organic contaminants. Heterogeneous photocatalysis offers an effective green alternative for the degradation of organic pollutants, particularly in wastewater treatment. This research aimed to synthesize and characterize nanostructured zinc oxide films to develop a UV-light activated photocatalyst capable of degrading organic compounds. The films were synthesized via the sol-gel method, and deposited on borosilicate glass substrates by spray coating and spray pyrolysis techniques. The samples underwent heat treatment at varying times and temperatures. The photocatalytic efficiency was evaluated by the methyl orange dye discoloration under UVA radiation. Wurtzite structure was observed in all conditions. Differences in surface morphology, band gap energies, and photocatalytic performance were also noted. Both methods enabled the production of UVA-photoactived films.
Structural design and stress analysis of a high-speed turbogenerator assembly supported by hydrodynamic bearings Rodrigo Teixeira Bento, André Ferrus Filho, Marco Antonio Fumagalli International Journal of Manufacturing Materials and Mechanical Engineering, 2020 Turbine and bushing bearing are the most critical components of high-speed machines. This article describes the design of a high-speed turbine supported by hydrodynamic bearings. The mathematical dimensioning and the FEM analysis are presented to validate the mechanical strength of the turbine and the bushing bearing models. Fatigue life and factor of safety were also determined. The simulations showed that the maximum Von Mises stress values obtained are associated to the centrifugal force generated by the system rotational movement. The results variation was mainly due to the properties of the materials proposed. For the turbine, 7075-T6 aluminum alloy and SAE 4340 steel obtained satisfactory behavior under a constant operating speed of 30,000 RPM. For the hydrodynamic bearing, the TM23 bronze alloy exhibited excellent results, without fracture, and low mechanical deformation. The models exhibited a great potential employment in several applications, such as biogas systems to generate electrical energy, and educational test bench for thermodynamic and tribological simulations.
Development of a rules-based fuzzy algorithm for deviation of obstacles 10th International Conference on Integrated Modeling and Analysis in Applied Control and Automation Imaaca 2017 Held at the International Multidisciplinary Modeling and Simulation Multiconference I3m 2017, 2017
Development of a rules-based fuzzy algorithm for deviation of obstacles International Conference on Integrated Modeling and Analysis in Applied Control and Automation, 2017
