Monte Carlo Simulations of Ultrathin Magnetic Dots

In this work we study the thermodynamic properties of ultrathin ferromagnetic dots using Monte Carlo simulations. We investigate the vortex density as a function of the temperature and the vortex structure in monolayer dots with perpendicular anisotropy and long-range dipole interaction. The interplay between these two terms in the hamiltonian leads to an interesting behavior of the thermodynamic quantities as well as the vortex density.Comment: 10 figure

Sistemas financeiros e o financiamento à inovação: algumas reflexões para o Brasil

Technological change and innovation is now playing an important role in economic growth. In this framework, investigations towards financial system role in financing technological change and innovation are important contributions to comprehend sources of economic growth. Financing innovation activities is still a gap to be treated specially in National Innovation System literature. This paper is a contribution in this direction being a reflection about financial system and innovation, showing the Brazilian case.Technological change, financial systems, Brazil

Inovação e seu financiamento: as contribuições da nova economia institucional

This working paper is an initial effort to analyze theoretical contributions from New Institutional Economics (NEI), specially the Transaction Costs framework, for understanding financial mechanisms to innovation. Transaction Costs economy is one hand from firm’s contractual theories that allows investigating how resources are allocated inside the firms. For the purpose of the paper, it will be analyze resource’s allocation for innovative activities that embraces uncertainly, asymmetric information and high risk.

INTERAÇÃO UNIVERSIDADE-EMPRESA NO BRASIL EM 2002 E 2004: UMA APROXIMAÇÃO A PARTIR DOS GRUPOS DE PESQUISA DO CNPq

The present work investigates university-industry interactions in Brazil using CNPq's research groups as a proxy. The data were collected in CNPq's Research Groups Directory collected in Census 2002 and 2004. Although limitations intrinsic to information collected, the database supplies some evidence from recent university-industry interactions in Brazil. The results point that in 2002 relationship reflected low sophisticated academic inputs, towards adaptations, and in 2004 a closer relationship between universities and firms are observed, showed in relationships based in scientific research and technology transference. This result were in accordance with Brazilian's National System of Innovation, but also suggests that much more can be done fostering academic knowledge transference to firms in the country.

A changing role for universities in the periphery

An international research on interactions between universities and firms is an opportunity to investigate this subject beyond the developed countries. This project involves 12 countries from three continents: Africa (South Africa, Nigeria and Uganda), Asia (South Korea, China, India, Thailand and Malaysia) and Latin America (Mexico, Costa Rica, Argentina and Brazil). This paper introduces a theoretical framework to deal with this broad set of countries, their different levels of NSI formation and their different levels of development. This framework may help public policies to understand the role of universities for a country search for an “active insertion in the international division of labor”.interactions between firms and universities, National Innovation Systems, catch up processes.

Phase transition in ultrathin magnetic films with long-range interactions: Monte Carlo simulation of the anisotropic Heisenberg model

Ultrathin magnetic films can be modeled as an anisotropic Heisenberg model with long-range dipolar interactions. It is believed that the phase diagram presents three phases: An ordered ferromagnetic phase I, a phase characterized by a change from out-of-plane to in-plane in the magnetization II, and a high-temperature paramagnetic phase III. It is claimed that the border lines from phase I to III and II to III are of second order and from I to II is first order. In the present work we have performed a very careful Monte Carlo simulation of the model. Our results strongly support that the line separating phases II and III is of the BKT type.Comment: 7 page

Escape configuration lattice near the nematic-isotropic transition: Tilt analogue of blue phases

We predict the possible existence of a new phase of liquid crystals near the nematic-isotropic ($NI$) transition. This phase is an achiral, tilt-analogue of the blue phase and is composed of a lattice of {\em double-tilt}, escape-configuration cylinders. We discuss the structure and the stability of this phase and provide an estimate of the lattice parameter.Comment: 5 pages, 6 figures (major revision, typos corrected, references added