This paper is a theoretical contribution to the Fuzzy Mathematics, from the definition of new concepts, a new operation with fuzzy sets and a theorem, first appear the following elements: harmonic fuzzy set, related fuzzy sets, fuzzy sets which transmutes, transmutation of a fuzzy set, transmuted fuzzy set, synthetic value of the elements of the fuzzy set E with respect to the fuzzy set which transmutes O and a preposition or theorem that shows the dimension of this synthetic value. All contributions have a direct application in practice and its treatment in this paper facilitates its use.

In fuzzy mathematic, one concept which multiple applications appear in the scientific literature, is the concept of adaptation coefficient. However, theoretically their definition is insufficient to guarantee the models of the reality, because in the reality manifesting processes that not are included in this concept. The author, through this work contributes three new concepts (over weights in the adaptation, brakes coefficient for equals adaptation coefficients and adjusted brakes coefficient for equals adaptation coefficients) that help to prosper a theory of the adaptation, supplementing the theoretical inadequacies and guaranteeing a better practical approach to the real world.

Grounded Theory, developed by Barney G. Glaser and Anselm L. Strauss, has had in the last years an important impact on the qualitative research field, mainly applied to clinical and educational research. We consider that its methodology is perfectly applicable to business research, with a scientific rigor hardly achievable with the qualitative methodologies that are usually used.

Resumen es: Los hongos P. ostreatus, presentan pardeamiento enzimatico en el periodo de poscosecha, para minimizarlo se incorpora acido ascorbico como inhibidor de l...

This paper presents a methodology to solve the distribution system planning problem. In its solution a three-phase model is taking into account with different design and operational costs, including relocation and upgrading of existing elements and location and dimensioning of the new ones. The operational costs consider energy losses in conductors. To solve this model the genetic algorithm of Chu-Beasley is used. The methodology is tested using a system with 54 points to link new users, and analyzed under different operative conditions. Results obtained present good quality, due to low losses as a result to adequate transformers location, appropriate selection of conductors and a good load balancing.

This article shows the programming paradigms in a simple way and inside a conceptual timeline looking for them as a needing of the human knowledge evolution. We present a brief description of the paradigms and their applications and we establish some considerations about the relation between the evolution of the human thinking and the new problems of the world. In the same way, we present a prospection of the programming languages in the time and what we can wait in the world of the computers programming in the next future.