Many proposed applications of graphene require the ability to tune its electronic structure at the nanoscale. Although charge transfer and field-effect doping can be applied to manipulate charge carrier concentrations, using them to achieve nanoscale control remains a challenge. An alternative approach is 'self-doping', in which extended defects are introduced into the graphene lattice. The con...

Self-assembly in natural and synthetic molecular systems can create complex aggregates or materials whose properties functionalities rise from their internal structure arrangement. The key microscopic features that control such assemblies remain poorly understood, nevertheless. Using classical density functional theory, we demonstrate how the intrinsic length scales interplay terms of interspec...

In Portuguese, different strategies for dealing with tune-text accommodation have been reported. However, no systematic research has been conducted exploring crucial cases of complex nuclear melodies realized in nuclear words with final stress, as in yes-no questions. Based on reading and semispontaneous data from ten regions in Brazil and eleven regions in Portugal, this study reveals that Bra...

This paper presents the development of a Genetic Algorithm Supervisory Loop (GASL) to enhance the performance of Adaptive Controllers in the Self Tuning Regulator (STR) framework. The GASL is designed to tune the identification model and control parameters to achieve an optimum performance of the process. The STR controller used to demonstrate the technique effectiveness is a real time Proporti...

Control A. Carlevarino, R. Martinotti, G. Metta and G. Sandini Lira Lab – DIST – University of Genova Via Opera Pia, 13 – 16145 Genova, Italy E-mail: [email protected] Abstract This paper describes a novel network model, which is able to control its growth on the basis of the approximation requests. Two classes of self-tuning neural models are considered; namely Growing Neural Gas (GNG) a...

54 www.aiche.org/cep June 2008 CEP Because most processes are self-regulating, it can sometimes be challenging to tune a controller for an integrating process. The principal characteristic of a self-regulating process is that it naturally seeks a steadystate operating level if the controller output and disturbance variables are held constant for a sufficient period of time. For example, a car’s...

The high-level control of dynamic systems, such as aircraft, airports, air tra c, or spacecraft, consists in deciding at each control step on which action(s) to be performed as a function of current observations and objectives. Successive decisions must entail that the dynamics of the controlled system satis es user objectives as best as possible. To do so, a usual approach, inspired from the M...