A new hybrid technique for optimization of a multivariable function is proposed. This method is applied to the problem of complex time Green’s function of multilayer media. This technique combines Particle Swarm search algorithm with the gradient based quasi-Newton method. Superiority of the method is demonstrated by comparing its results with other optimization techniques.

this article is devoted to the simultaneous optimization of shape and topology of shell structures. the optimum shape is obtained together with the optimum layout for the reinforcement layers at the both sides of the shell surface. to solve this problem the finite element method is employed. it is assumed that each element is comprised of a porous media with microscopic rectangular voids where ...

In the cell growth and metabolite production, the selection of nutrients and determination of its concentrations in the cultivation media is very important step for commercially viable products. Formulation of media requires lot of experiments and so time consuming and tedious. The conventional methods also involves errors. To eliminate the error involved and to reduce the number of experiments...

This paper describes the development of a micro media actuator (MMA) for probe-based mass data storage. The process is based on dry etching and incorporates a thinned silicon media sled to increase the frequency response of the system. The suspended micro-mechanical media sled moves in x-y (±50 μm) using electrostatic actuation. The system design specification requires actuation of an 8x8 mm ma...

level: intermediAte Most biopharmaceutical production platforms are based on fed-batch cell culture protocols, which can support high volumetric productivity while maintaining low operational complexity (1). The industry is interested in developing or refining high-titer cell culture processes to meet increasing market demands and reduce manufacturing costs (2). Although advancements in cell en...

level: intermediAte Most biopharmaceutical production platforms are based on fed-batch cell culture protocols, which can support high volumetric productivity while maintaining low operational complexity (1). The industry is interested in developing or refining high-titer cell culture processes to meet increasing market demands and reduce manufacturing costs (2). Although advancements in cell en...

The paper deals with a topology optimization formulation that uses mixed-finite elements. The discretization scheme adopts not only displacements (as usual) but also stresses as primary variables. Two dual variational formulations based on the HellingerReissner variational principle are presented in continuous and discrete form. The use of this technique and the choice of nodal densities as opt...

Corresponding Author: Rony Baskoro Lukito School of Computer Science, Bina Nusantara University, Jakarta, Indonesia Email: [email protected] Abstract: The number of internet users around the world continue to grow and will continue to grow along with advances in communications technology. Communication technology which is now headed to the fourth generation (better known as 4G), allowing acces...