New approach for robust multi-objective optimization of turning parameters using probabilistic genetic algorithm

In this paper, a contribution to the determination of reliable cutting parameters is presented, which is minimizing the expected machining cost and maximizing the expected production rate, with taking into account the uncertainties of uncontrollable factors. The concept of failure probability of stochastic production limitations is integrated into constrained and unconstrained formulations of multi-objective optimiza- tion problems. New probabilistic version of the nondominated sorting genetic algorithm P-NSGA-II, which incorporates the Monte Carlo simulations for accurate assessment of cumula- tive distribution functions, was developed and applied in two numerical examples based on similar and anterior work. In the first case, it is a question of the search space that is completely ‘ closed ’ by high natural variability related to the multi-pass roughing operation: in this case, the failure risk of technolog- ical limitations are considered as objectives to minimize with economic objectives. The second case is related to deformed search space due to the uncertainties specific to finishing op- eration; therefore, the economic objectives are minimized un- der imposed maximum probabilities of failure. In both situa- tions, the efficiency and robustness of optimal solution

Assessment of the availability of phosphate to corn (Zea mays L) using 32P isotope dilution technique

This study investigate the effectiveness of two phosphate rocks (PRs), an unreactive phosphate rock from China (CPR) and a reactive phosphate rock from North Carolina, USA (NCPR) compared to triple superphosphate (TPR), a highly water-soluble phosphate fertilizer. These fertilizers were tested using three crops of corn (Zea mays L) grown consecutively on a Serdang series soil (Typic Paleudult). 32P isotope dilution technique was used to access their P availability. The rate of P used was 100 kg P ha-1, applied once at the beginning of the experiment. NCPR was as efficient as TSP in providing P to the first crop, while CPR showed the lowest percentage of utilization. In the second crop, NCPR was the superior source of P. However, in the third crop all three sources showed very poor percentages of utilization. The total amount of P taken up by the three crops of corn was 13.65, 18.04 and 8.56 kg ha-1 from TSP, NCPR and CPR respectively. Thus this study suggests that NCPR is an effective source of P for corn and can be used as a substitute for the water-soluble phosphate fertilizers. CPR is not a suitable phosphate source

Optimisation robuste de la qualité de surface usinée et de la productivité sous la limitation des vibrations

Dans cette contribution, nous présentons une optimisation robuste des paramètres de coupe, avec la prise en compte des incertitudes inhérentes à l'usure et à la déflexion de l'outil pour une opération de chariotage d'un acier 100C6. Dans une première étape, nous procédons à la construction des modèles de substitution qui relient les paramètres de coupe aux variables d'intérêt basée sur l'utilisation de plan d'expériences. Nos deux objectifs sont le meilleur état de surface et le maximum de productivité sous limitations liées aux vibrations et aux niveaux des trois paramètres de coupe. Ensuite, à l'aide de l'algorithme génétique développé et basé sur un mécanisme d'évaluation robuste de chromosomes par les simulations de Monte-Carlo, l'influence et l'intérêt de l'intégration des incertitudes dans l'optimisation en usinage sont mis en évidence. Après comparaison des fronts de Pareto classique et robuste, des qualités de surfaces moins efficaces mais robustes peut être obtenue avec la prise en compte des facteurs incontrôlables ou des incertitudes contrairement à ce que prévoit l'optimisation déterministe et classique pour les mêmes valeurs de la productivit

Antimicrobial properties from different parts of Ficus Deltoidea / Norintan Sahali

Antimicrobial agents from natural sources gained attention as antimicrobial resistance has become a growing issue. Ficus deltoidea is a traditional medicine plant that clinically proven has antimicrobial properties. However, determination of antimicrobial properties from different parts ofFicus deltoidea is needed, as it able to identify the part of the plant that possessed antibacterial properties against Staphylococcus aureus (ATCC 43300), Bacillus cereus (ATCC 14579), Escherichia coli (ATCC 25922), and Pseudomonas aeruginosa (ATCC 27853). Screening of antimicrobial activity of methamlic extract of the lea~ stem, fig, and root ofFicus deltoidea was made using disc diffusion method, followed by minimum inhibition concentration (MIC) and minimum bactericidal concentration (MBC) for sensitive organisms. The preliminary screening showed inhibition activity of all Ficus deltoidea parts against Staphylococcus aureus and Bacillus cereus, but negative results for Escherichia coli and Pseudomonas aerugin0 sa. The MIC ofthe leafwas considered as good against Staphylococcus aureus and Bacillus cereus, same as the fig and stem against Staphylococcus aureus. While the remaining plant parts were considered as rmderate. The MBC test confirming bactericidal effects of all parts of Ficus deltoidea against both Staphylococcus aureus and Bacillus cereus. The leaf, stem, fig and root ofFicus deltoidea against Staphylococcus aureus has MBC value of62.5mg/ml, 125mglml, 125mg/ml and 250mg/ml. While against Bacillus cereus have a value of62.5mg/ml, 250mg/ml, 500mg/ml and 500mg/ml. This study reveals that Ficus deltoidea leaf, fig, stem and root extract have antibacterial activities against Staphylococcus aureus and Bacillus cereus, and could potentially be used as a natural antibacterial agent to treat bacterial infections

Some properties of the generalized p-adic gamma function

In this paper, we define a q-adic factorial and we demonstrate some properties of a generalized p-adic gamma function. Also, some numerical examples have been give

Analyse du discours des personnages dans A l'ombre de soi de Karim Sarroub

Analyse du discours des personnages dans A l'ombre de soi de Karim SarroubNotre recherche s’intitule « Analyse du discours des personnages dans ‘À l’ombre de soi’ de Karim Sarroub ». Le roman a été publié pour la première fois à Paris en 1998, aux éditions Gallimard (Mercure de France), puis réédité à Alger en novembre 2001 par les éditions Marsa, avec le soutien du Commissariat général de l’Année de l’Algérie en France. À l’ombre de soi raconte l'histoire de Zoheir, un ancien détenu de la prison de Maubeuge. Pendant les quatre jours qui constituent le cadre temporel du récit, Zoheir erre sans but dans Paris, passant d'un café à un autre et d'un bar à un autre, jetant un regard indifférent et désintéressé sur un monde qu'il trouve « méconnaissable » et même « absurde »

Comparative analysis of the impacts on the environmental sustainability in Hass Avocado cultivation in Colombia, Mexico, and Perú

El Aguacate Hass (AH) actualmente se encuentra en gran auge dado su alto consumo a nivel mundial, por lo cual Colombia juega un papel importante como exportador. El presente trabajo consistió en realizar una revisión bibliográfica de los impactos sobre la sostenibilidad ambiental por la expansión del cultivo de AH en el país, teniendo en cuenta otros países productores y exportadores (México y Perú). Se encontró que la sostenibilidad ambiental se ve afectada en el recurso hídrico, el suelo, la biodiversidad y además contribuye con el aumento de la deforestación, lo que conlleva a cambios en el uso del suelo. Por último se presentan algunas iniciativas en materia de gestión ambiental en México y Colombia encontradas durante la revisión bibliográfica, así como propuestas para el manejo ambiental del cultivo de AH, destacando el ordenamiento del territorio como pilar fundamental para su sostenibilidad.Hass Avocado (AH) is currently experiencing a great boom due to it’s high global consumption,in which Colombia plays an important role as an exporter. This study consisted of perform a narrative bibliographic review on the environmental sustainability impacts about the expansión of AH cultivation in the country, taking into account other producing countries such as Mexico and Peru. It was found that environmental sustainability is affected in terms of water resources, soil, biodiversity, and also contributes to an increase in deforestation, leading to changes in the land use. Finally, some environmental management initiatives found in Mexico and Colombia during the literature review are presented, as well as proposals for environmental management of AH cultivation, highlighting land planning as a fundamental pillar for its sustainability.Especializació