Membrane Fission: A Computational Complexity Perspective

Membrane fission is a process by which a biological membrane is split into two new ones in the manner that the content of the initial membrane is separated and distributed between the new membranes. Inspired by this biological phenomenon, membrane separation rules were considered in membrane computing. In this work, we investigate cell-like P systems with symport/antiport rules and membrane separation rules from a computational complexity perspective. Specifically, we establish a limit on the efficiency of such P systems which use communication rules of length at most two, and we prove the computational efficiency of this kind of models when using communication rules of length at most three. Hence, a sharp borderline between tractability and NP–hardness is provided in terms of the length of communication rules.Ministerio de Economía y Competitividad TIN2012-3743

The organizational design of nonprofits for people with disabilities

Utilizando información obtenida de los directivos de 105 pequeñas organizaciones sin fines de lucro españolas que, en el año 2007, se dedicaban a la prestación de servicios a personas con discapacidad, hemos analizado como el diseño organizativo –en concreto, los sistemas de recompensas extrínsecas e intrínsecas- influye sobre la delegación, la motivación y la transferencia de conocimiento a la hora de lograr el objetivo de la organización consistente en mejorar la calidad de vida de las personas que viven con una discapacidad. Los resultados muestran que, debido a la carencia de conocimiento técnico, los directivos de estas entidades no lucrativas (ENL) deben delegar derechos de decisión en empleados cualificados y utilizar en mayor medida recompensas intrínsecas y extrínsecas para motivar a los empleados a que transmitan conocimiento entre ellos eficientemente.We use data obtained from managers of 105 small nonprofit organizations (NPOs) providing services to people with disabilities in Spain in 2007 to examine how organizational design—particularly, extrinsic and intrinsic reward systems—impacts delegation, motivation, and knowledge transfer to achieve the NPO’s goal to improve the lives of persons living with disabilities. We find that, due to lack of technical knowledge, managers of these NPOs must delegate decision rights to qualified employees and that they successfully use a higher degree of intrinsic and extrinsic rewards to motivate employees to transfer knowledge among themselves efficiently

Broken planar Skyrmions — statics and dynamics.

The broken planar Skyrme model is a theory that breaks global O (3) symmetry to the dihedral group D N . It has been shown that the single soliton solution is formed of N constituent parts, named partons, that are topologically confined. The multisoliton solutions have already been computed for N = 3 and were shown to be related to polyiamonds. We extend this for larger N and demonstrate that this polyform structure continues (planar figures formed by regular N -gons joined along their edges, of which polyiamonds are the N = 3 subset). Furthermore, we numerically simulate the dynamics of this model for the first time. It will be demonstrated that the time dependent behaviour of these solutions can be broken down into the interactions of its constituent partons, with certain collisions exhibiting parton exchange. The results are then compared with those of the standard planar Skyrme model

Llama la Antártida - Hanz Helfritz - Editorial “El Buen Libro", Buenos Aires, 1948.

Fil: Pérez, Martín. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

La primera expedición Antártica Argentina con propósitos científicos, se proyectó en el año 1881

Fil: Pérez, Martín. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Balde, provincia de San Luis : una instalación humana en la región árida argentina

Fil: Pérez, Martín. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Antártida Argentina - Publicación del Ministerio de Relacionas Exteriores y Culto - Comisión Nacional del Antártico, Buenos Aires, 1949.

Fil: Pérez, Martín. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Labor geográfica del Perito Moreno : los estudios geográficos en la República Argentina, durante la segunda mitad del siglo pasado

Fil: Pérez, Martín. Universidad Nacional de Cuyo. Facultad de Filosofía y Letras. Instituto de Geografí

Historia de la Antártida - Por Carlos Aramayo Alzerreca, con palabras preliminares de José Gobelo - Buenos Aires, Editorial Hemisferio, 1949.

Fil: Pérez, Martín. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra