How the Cosmological Constant Affects the Gravastar Formation (2009)
Here we generalized a previous model of gravastar consisted of an internal de Sitter spacetime, a dynamical infinitely thin shell with an equation of state, but now we consider an external de...
Stable Gravastars of Anisotropic Dark Energy (2008)
Chan, R., Rocha, P., Wang, Anzhong
Dynamical models of prototype gravastars made of phantom energy are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state $p = (1-\gamma)\sigma$...
Teleoperating a Mobile Robot A Solution Based on JAVA Language (2008)
F. Monteiro, P. Rocha, P. Menezes, A. Silva, J. Dias
Abstract- This article describes a computational framework, which can run almost on every computer connected to a IP based network, to study teleoperation techniques. The paper discusses the...
Stable and "bounded excursion" gravastars, and black holes in Einstein's theory of gravity (2008)
Rocha, P., Chan, R., Wang, Anzhong
Dynamical models of prototype gravastars are constructed and studied. The models are the Visser-Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of a perfect fluid with...
Bounded excursion stable gravastars and black holes (2008)
Rocha, P., Miguelote, A. Y., Chan, R., Da Silva, M. F., Santos, N. O., Wang, Anzhong
Dynamical models of prototype gravastars were constructed in order to study their stability. The models are the Visser-Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of...
Teleoperating a Mobile Robot - A Solution Based on JAVA Language (2008)
F. Monteiro, P. Rocha, P. Menezes, A. Silva, J. Dias
This article describes a computational framework, which can run almost on every computer connected to a IP based network, to study teleoperation techniques. The paper discusses the teleoperation of a...
Challenges to evaluation of multilingual geographic information retrieval in GeoCLEF (2007)
Gey, F., Larson, R., Sanderson, M., Bischoff, K., Mandl, T., Womser-Hacker, C., ...
This is the third year of the evaluation of geographic information retrieval (GeoCLEF) within the Cross-Language Evaluation Forum (CLEF). GeoCLEF 2006 presented topics and documents in four languages...
Representations and structural properties of periodic systems (2007)
Aleixo, J.C., Polderman, J.W., Rocha, P.
We consider periodic behavioral systems as introduced in [Kuijper, M., & Willems, J. C. (1997). A behavioral framework for periodically time-varying systems. In Proceedings of the 36th conference on...
A contribution to the study of periodic systems in the behavioral approach (2007)
Aleixo, J.C., Polderman, J.W., Rocha, P.
In this paper we obtain new results on periodic kernel representations and propose a definition of “image" representation for periodic behaviors. Further, we characterize controllability and...
GeoCLEF 2006: the CLEF 2006 Ccross-language geographic information retrieval track overview (2006)
Gey, F., Larson, R., Sanderson, M., Bischoff, K., Mandl, T., Womser-Hacker, C., ...
After being a pilot track in 2005, GeoCLEF advanced to be a regular track within CLEF 2006. The purpose of GeoCLEF is to test and evaluate cross-language geographic information retrieval (GIR):...
Controllability, autonomicity and free variables in periodic behaviors (2006)
Aleixo, J.C., Polderman, J.W., Rocha, P.
In this paper we propose a new type of “image” representation for periodic behaviors and analyze the relationship between image representability and controllability, showing that the...
Autonomicity and the absence of free variables for behaviors over finite rings (2006)
Kuijper, M., Pinto, R., Polderman, J.W., Rocha, P.
The equivalence between autonomicity and the absence of free variables is a well-known result for linear, shift-invariant and complete behaviors over a field. However, this no longer holds for a...
Overview of the CLEF 2004 Multilingual Question Answering Track (2005)
Magnini, B., Vallin, A., Ayache, C., Erbach, G., Penas, A., Rijke, M. De, ...
Following the pilot Question Answering Track at CLEF 2003, a new evaluation exercise for multilingual QA systems took place in 2004. This paper reports on the novelties introduced in the new campaign...
Félix, A.P., Rocha, P., Brazao, C.I., Franquinho Aguiar, A. M.
Em 2002, o predador Hyperaspis pantherina Fürsch, foi importado do Quénia, através do Kenya Forestry Research Institute, para a Ilha da Madeira, com o objectivo de combater através de luta...
Félix, A.P., Vasconcelos, J., Brazao, C.I., Franquinho Aguiar, A. M., Rocha, P.
El coccinélido Hyperaspis pantherina Fürsch, depredador específico de la cochinilla Orthezia insignis Browne, ha sido importado de Kenia y está siendo reproducido en laboratorio desde Julio de...
On the Markov property for continuous multidimensional behaviors (2004)
\emph{Proc. of the16-th symposium on the Mathematical Theory of Networks and Systems (MTNS'04)}, Leuven, Belgium, Jul. 2004
Trung-Nghia, P., Bassie, L., Safwat, G., Thu-Hang, P., Lepri, O., Rocha, P., ...
We investigated whether down-regulation of arginine decarboxylase (ADC) activity and concomitant changes in polyamine levels result in changes in the expression of downstream genes in the polyamine...
MÍDIA E RELIGIÃO: CANAL SÉCULO 21 E REDE FAMÍLIA (2002)
Trabalho apresentado no NP13 - Comunicação e Cultura das Minorias , evento componente do XXV Congresso Brasileiro de Ciências da Comunicação, Salvador, BA, 2002
Rocha, P., Stenzel, O., Parr, A., Walton, N., Christou, P., Dräger, B., ...
The cDNAs from Hyoscyamus niger, encoding two enzymes of tropane-alkaloid biosynthesis, tropinone reductase I (TR-I) and hyoscyamine-6beta-hydroxylase (H6H), have been simultaneously introduced into...
Trajectory control and interconnection of 1D and nD systems (2001)
In this paper we examine the relationship between control viewed as concatenation of trajectories, and control viewed as interconnection of systems. We show that, for 1D linear time-invariant...
Trajectory control and interconnection of 1D and nD systems (2001)
In this paper we examine the relationship between control viewed as concatenation of trajectories, and control viewed as interconnection of systems. We show that, for 1D linear time-invariant...
Trajectory control and interconnection of 1D and nD systems (2001)
In this paper we examine the relationship between control viewed as concatenation of trajectories, and control viewed as interconnection of systems. We show that, for 1D linear time-invariant...
Structure indices for multidimensional systems (2000)
Wood, J., Rocha, P., Rogers, E., Owens, D.H.
The structure indices of a one-dimensional system are an important set of invariants. In this paper we examine a generalization of this concept to multidimensional linear systems, which corresponds...
Interconnection and control of multidimensional systems using latent variables (2000)
In the nD case, a relationship between control viewed as system interconnection and trajectory control can be obtained in terms of the notion of extended interconnection. Such an interconnection...
Structure indices for multidimensional systems (2000)
Wood, J., Rocha, P., Rogers, E., Owens, D.H.
The structure indices of a one-dimensional system are an important set of invariants. In this paper we examine a generalization of this concept to multidimensional linear systems, which corresponds...
Interconnection and control of multidimensional systems using latent variables (2000)
In the nD case, a relationship between control viewed as system interconnection and trajectory control can be obtained in terms of the notion of extended interconnection. Such an interconnection...
Structure indices for multidimensional systems (2000)
Wood, J., Rocha, P., Rogers, E., Owens, D.H.
The structure indices of a one-dimensional system are an important set of invariants. In this paper we examine a generalization of this concept to multidimensional linear systems, which corresponds...
Interconnection and control of multidimensional systems using latent variables (2000)
In the nD case, a relationship between control viewed as system interconnection and trajectory control can be obtained in terms of the notion of extended interconnection. Such an interconnection...
A foundation for the control theory of nD behaviours (1998)
In this paper we introduce the concept of B'-controllability, which is a natural formalism for the control of nD systems in the behavioural framework. We show that this concept is equivalent to...
A foundation for the control theory of nD behaviours (1998)
In this paper we introduce the concept of B'-controllability, which is a natural formalism for the control of nD systems in the behavioural framework. We show that this concept is equivalent to...
A foundation for the control theory of nD behaviours (1998)
In this paper we introduce the concept of B'-controllability, which is a natural formalism for the control of nD systems in the behavioural framework. We show that this concept is equivalent to...
A New Perspective on Controllability Properties for Dynamical Systems (1997)
In this paper we study the properties of weak and strong controllability as newly defined in (Rocha, 1995) for delay-differential systems in a behavioural setting, now for the multidimensional case....
A New Perspective on Controllability Properties for Dynamical Systems (1997)
In this paper we study the properties of weak and strong controllability as newly defined in (Rocha, 1995) for delay-differential systems in a behavioural setting, now for the multidimensional case....
A New Perspective on Controllability Properties for Dynamical Systems (1997)
In this paper we study the properties of weak and strong controllability as newly defined in (Rocha, 1995) for delay-differential systems in a behavioural setting, now for the multidimensional case....
Benit, E, Vrolix, M C, Rocha, P, De Geest, H
Since its introduction in 1984, percutaneous transvenous mitral balloon valvuloplasty (PTMV) has emerged as an effective technique in the treatment of selected patients with severe mitral stenosis....
Percutaneous transvenous mitral valvuloplasty (PTMV) was performed with two cylindric pigtail balloon catheters in a 52-year-old woman with symptomatic mitral stenosis. The subvalvular apparatus was...
Left ventricular compliance in acute myocardial infarction in man (1977)
BARDET, J., ROCHA, P., RIGAUD, M., BOURDARIAS, J. P., MATHIVAT, A.
Left ventricular end-diastolic pressure (P) and volume (V) were measured in 12 patients with acute myocardial infarction. It was assumed that the diastolic P-V relationship was exponential and...