P systems with communication based on concentration

We consider a variant of P systems where the communication of objects is controlled by the "concentration" of these objects: after each evolution step, the objects are redistributed among the regions of the system in such a way that each region contains the same number of copies of each object (plus/minus one, when the number of objects is not divisible by the number of regions). We show that P systems of this form, with only one flip-flop catalyst but without using other control ingredients, can generate the Parikh images of all matrix languages. When an unbounded number of catalysts is available, a characterization of recursively enumerable sets of vectors of natural numbers is obtained (by systems with only one membrane)

Membrane Computing and Economics: A General View

Three are the points we briefly discuss here: using membrane computing tools for efficient computing/optimization, the possibilities of using “general" membrane computing (P systems using multisets of symbol objects processed by biochemical-like evolution rules) as a framework for modeling economic processes, and the numerical P systems, a class of computing devices explicitly defined with a motivation related to economics. The discussion is rather informal, only pointing out research directions and providing bibliographical information

ENERGY PLANTS ALTERNATIVE TO FUTURE BIOFUEL PRODUCTION

Replacing fossil fuels with alternative renewable energy sources is a very current issue worldwide. The development of energy plant (lingo-cellulosic) crops represents the promising solution, for the future production of biofuels in order to produce renewable energy and replace fossil fuels. For the implementation of energy crops were elaborated a series of technologies and technical equipment that respond to the requirements of these crops. The paper addresses these technologies, technical equipment and technologies for valorizing energy crops