En el presente trabajo se utiliza la t‚cnica del An lisis Factorial M£ltiple (AFM) sobre una muestra de 592 empresas manufactureras de Estados Unidos que llevan a cabo actividades de investigaci¢n y desarrollo (I+D) para el per¡odo 1999ª2003, con el objetivo de analizar las posibles...

El objetivo del presente trabajo es evidenciar la existencia de diferencias en las estructuras econ¢micas y financieras de empresas Colombianas que cesaron su actividad en el per¡odo 1993-2005, por cuestiones asociadas a procesos de liquidaci¢n, frente a aquellas que se mantuvieron en el...

Three hypotheses on services, the Gershuny effect, the externalization of producers services, and the macroeconomic equation for the services share in employment, are tested with Brazilian data. The first two show trends similar to those in the developed economies but, in the last one, findings...

Much has been written about the socioeconomic distribution of nutritional status, both in more economically developed, and in developing nations. In general, persons of lower socioeconomic status suffer adverse consequences of poor nutritional status, although these consequences can vary...

Efficient management of the natural gas business chain - based on pipeline transmission networks and taking into consideration the interaction among the main players (e.g., shippers, suppliers, transmission companies and local distribution companies) - requires the use of decision-making support...

In this paper we use exact numeration techniques and multispin coding to study the dynamics of a bit-string model proposed to describe the time evolution of B-cell repertoire. Each clone of B-cells and antibodies is characterized by its molecular receptor, associated to a bit-string, and the...

Modifying the Redfield model of sexual reproduction and the Penna model of biological aging, we compare reproduction with and without recombination in age-structured populations. In constrast to Redfield and in agreement with Bernardes we find sexual reproduction to be preferred to asexual one....

Consider two species that diffuse through space. Consider further that they differ only in initial densities and, possibly, in diffusion constants. Otherwise they are identical. What happens if they compete with each other in the same environment? What is the influence of the discrete nature of...

This paper presents a study based on the Systems Thinking and Scenario Planning (STSP) method, focusing the biodiesel production chain of Rio Grande do Sul State. The aim of the study was to identify key elements to comprehend the systemic structure of interaction among the ties of this chain....