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Thermal Shock of Al2O3-SiC Ceramic Material Obtained by Replication Method

材料科学与工程（中英文版） 2010年第4期4卷 66-70页

作者： Wilson Acchar Wagner Lopes Torquato Antonio Carlos Costa femando barcelos souza Eduardo Galvao Ramalho Pos-graduation Program of Science and Materials Engineering-UFRN NataI-RN CEP：59072-970 Brazil Pos-graduation Program of Mechanical Engineering-UFRN Natal-RN CEP： 59072-970 Brazil

Polymeric sponge replication technique is the most used process to obtain ceramic foams with a cellular structure for filtration applications. The most used route to produce a closed-cell structure for filter applications is the replication of polymer foam by application of ceramic slurry [1-3]. This method consists in the impregnation of polymeric foam with ceramic slurry followed by a heating treatment that will burn out the organic elements and sintering the material, resulting of a replication of the original foam. Morphology, size of the cell and the degree of interconnectedness, permeability and mechanical properties at room and high temperatures are important parameters that influence significantly the application of these materials. In this work X-ray diffraction, scanning electron microscopy and thermal shock have been investigated for a cellular ceramic material with 10, 15 and 20 ppi (pores per linear inch). The results obtained in this work indicated that the mechanical properties show a significant dependence on the cell size and thermal shock temperature.

关键词：陶瓷材料 Al2O3 热冲击复制法 SiC 高温力学性能材料应用陶瓷浆料

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Performance of a Nonwoven Geotextile Reinforced Wall with Unsaturated Fine Backfill Soil

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Journal of Civil Engineering and Architecture 2013年第10期7卷 1253-1259页

作者： femando Henrique Martins Portelinha Benedito de souza Bueno Jorge Gabriel Zomberg Department of Civil Engineering Federal University of Sao Carlos Sao Carlos/SP 13564-350 Brazil Sao Carlos Engineering School University of Sao Paulo Sao Carlos/SP 13566-536 Brazil Civil Engineering Department University of Texas at Austin Austin/TX 78712-0280 USA

The use of marginal backfills in GSE （geosynthetic stabilized earth） walls has not been recommended by different standards specifications. Restrictions are motivated by the poor hydraulic conductivity of fine soils that are capable of developing of water pressures. However, the use of granular materials can expend the cost of the construction. As a result, local soils, granular or not, have been increasingly used. Unsaturated conditions of fine soils may result in convenient performance even using extensible reinforcements. This paper evaluates the performance of a full scale model of a nonwoven geotextile reinforced wall constructed with fine grained soil backfill. The unsaturated condition was maintained and matric suctions, displacements and reinforcement strains were monitored during the test. Results have shown that the unsaturated condition of the backfill allowed maximum reinforcement peak strain of 0.4 %. For the case of a wrap faced wall on a firm foundation the performance and good agreement between measured strains and factors of safety from limit equilibrium analyses have shown the maintenance of unsaturated conditions as an economical alternative to the use of high quality fill.

关键词： Reinforced soil wall nonwoven geotextile fine soil unsaturated soil.

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Electrochemical Remediation of 17α-Ethinylestradiol

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Journal of Chemistry and Chemical Engineering 2013年第4期7卷 344-350页

作者： femando Miguel de Amorim Lino Diogo Cordeiro Dias Renata Crispim Batista Eric de souza Gil Iranaldo Santos da Silva Lucio Angnes Faculty of Pharmacy Federal University of Goias Goiania 74605-220 Brazil Postgraduate Program in Environmental Engineering Federal University of Goias Goiania 74603-150 Brazil Institute of Chemistry University of Sao Paulo Sao Paulo 5509 Brazil

Technological development has led to the emergence of new substances with many different purposes generating a new profile of pollutants in waterways. Among these, endocrine disruptors, such as 17EE （17ct-ethinylestradiol）, are of great importance due to their wide application and harmful consequences to the environment, human health and animals. The inefficiency of most water treatment processes in withdrawing such substances poses a global concern for the development of effective and environmentally clean methods. The electrochemical remediation processes appear as a powerful and ＂green＂ alternative for waste removal of organic or inorganic pollutants from complex environments, such as geosphere and hydrosphere. The research focus in this field is mostly related to the optimization of electronic devices with higher （photo） catalytic efficiency, whereas the starting material remains based on metal and carbon conventional electrodes. In the present study, the anodic removal process of 17ct-ethinylestradiol at carbon cardboards was investigated in stationary and hydrodynamic conditions. The influence of pH and applied potential were evaluated, always taking into account the transposition of scale and environmental aspects. Thus, the principle of hormone removal showed to be strictly related to such parameters. It was observed that mild alkaline medium favors the anodic oxidation, whereas neutral and mild acid ones lead to higher adsorption at carbon surface. Also, when the applied potential was higher than 1.25 V, the electrochemical oxidation rate increased, and the adsorption was decreased. Furthermore, the removal efficiency of ! 7EE showed to be lower, the flow rate was higher.

关键词： Endocrine disruptors ethinylestradiol electrochemical remediation carbon electrodes.

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Development of a Genetic Algorithm for Evaluating the Performance of Overhead Power Distribution Lines and Proposing Solutions to Improve Distribution Line Safety

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Journal of Energy and Power Engineering 2015年第1期9卷 78-82页

作者： Fabio Romero Alden U. Antunes Dario Takahata Andre Meffe Carlos C. B. Oliveira femando L. Lange Hamilton souza Department of Engineering Research and Development Daimon Engineering & Systems Sao Paulo 01310200 Brazil Department of Engineering AES Eletropaulo Distribution Utility Sao Paulo 06460040 Brazil

This paper aims to present and discuss the use of a power flow methodology based on Gauss elimination method to evaluate the performance of distribution network taking into account the neutral conductor absence at specific sections, and a development of a methodology based on GA （genetic algorithm） capable of evaluating alternative solutions in different bars of the feeder, in order to propose appropriate solutions to improve the distribution network safety. Besides the technical aspects, the proposed GA methodology takes into account the economic feasibility analysis. The results of power flow simulations have shown that the presence of single-phase transformers along with the absence of the neutral conductor at specific sections of the MV （medium voltage） network may increase the Vng （neutral-to-ground voltage） levels of the feeders involved, jeopardizing the system＇s safety. On the other hand, the solutions proposed by the GA methodology may reduce the network Vng levels and improve the safety conditions, providing values close to the ones found before the neutral conductor theft.

关键词： Genetic algorithm power flow distribution line safety power flow simulation

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