In order to improve biosurfactant production by Yarrowia lipolytica IMUFRJ 50682, a factorial design was carried out. A 2(4) full factorial design was used to investigate the effects of nitrogen sources (urea, ammonium sulfate, yeast extract, and peptone) on maximum variation of surface tension (Delta ST) and emulsification index (EI). The best results (67.7% of EI and 20.9 mN m(-1) of Delta ST...

this paper focuses upon the development of an efficient method for conceptual design optimization of a satellite. there are many option for a satellite subsystems that could be choice, as acceptable solution to implement of a space system mission. every option should be assessment based on the different criteria such as cost, mass, reliability and technology contraint (complexity). in this rese...

Abstract Evolutionary Algorithms (EAs) based on structured coding have been proposed for aerodynamic optimization of wing design. Fractional factorial design is used to investigate interactions of the design variables to determine the appropriate coding structure for EAs in advance. The present EAs is applied to wing design problems where the wing shape is modeled using the parameter set for th...

This paper discusses an experimental design approach to optimize injection molding process parameter settings according quality targets. The method used is general factorial design, so that it can investigate the effect of each predictor variable (factor) and its interaction effect. In this study, front barrel temperature, pressure, holding time were selected as control factors. Before testing ...

Quercetin is a flavonoid from group of polyphenolic compounds. can be used as an alternative to acne treatment, predominantly triggered by Propionibacterium acnes. This study aimed determine the effect and proportion carbopol 940, propylene glycol, glycerin on physical quality quercetin gel, ability optimum formula in antibacterial test, its diffusion using Franz diffusion. uses factorial desig...