This paper describes the main aspects of Project Geosis. It is an ongoing three year project between the Brazilian oil company Petrobras and the Pontifical Catholic University of Rio de Janeiro, Brazil. Its main objective is to extract information from seismic data through the use of geometric and topological modeling, as well as scientific visualization.
The malignancy risk of endometrial polyps in postmenopausal women was correlated with the presence or absence of abnormal uterine bleeding. Of 481 postmenopausal women who presented with endometrial polyps at diagnostic hysteroscopy between 2004 and 2007, 48.9% were asymptomatic and 51.1% had postmenopausal uterine bleeding. Transvaginal ultrasound revealed… (More)
Single-valued tubular surfaces are built from a 3D directrix curve. Given a point on the directrix curve and an angular direction, a point on the surface is obtained by a function that corresponds to the distance between these two points along the given direction. This work presents a new algorithm for intersecting and trimming single-valued tubular… (More)
The influence of temperature (20-40 °C) on the acetaminophen adsorption onto activated carbons with different textures was studied. Different temperature dependences, not explained by kinetic effects, were observed for carbons with different micropore size distribution patterns: adsorption capacity increased for pine gasification residues (Pi-fa) derived… (More)
Vibro-acoustography (VA) is an acoustic image modality based on the response of tissue under exci-tation of two ultrasound beams with different-frequencies. The aim of this paper is to provide a quantitative analysis with experimental measurements of the difference-frequency (DF) pressure generated in VA. This analysis considered the radiation force , the… (More)
Paper prepared for the DIME Workshop " Motivations and Incentives: creating and organizing knowledge in organisational contexts " , Lisboa, March 30-31 Abstract: Work within firms is in a sense always a cooperative venture thus involving a social dilemma. This paper addresses the following related questions: 1. How is the problem of aligning the motivations… (More)