Encontrados 15 documentos, a visualizar página 1 de 2
An embedded formulation with conforming
Areias, Pedro; Dias-da-Costa, D.; Júlio, E.; Sluys, L. J.; Alfaiate, J.Use of strong discontinuities with satisfaction of compatibility
Approach for non-linear predictive control based on the local model ideas
Bravo,Claudio O. Ayala; Normey-Rico,Julio E.This paper presents a new approach for non-linear predictive control based on the local model ideas. The algorithm uses a non-linear (NL) model of the plant for internal simulation. When a change in the operating point is required this NL model is used to identify a linear ARX model of the process. The optimization procedure is then executed using this linear model and a control weighting factor adapted to the ...
Integrated design & control of a buck boost converter
Garcia,Martin J. Pomar; Normey-Rico,Julio E.; Gutierrez,Gloria; Prada,César deThis paper presents the integrated design and control of a buck boost converter (BBC). In the proposed methodology the design tool provides simultaneously the controller tuning and BBC design parameters in such a way that some closed-loop pre-specified static and dynamic behavior is obtained. This approach contrasts with the traditional methodology, where the design of BBC is performed without taking into accou...
A discrete strong discontinuity approach
Dias-da-Costa, D.; Alfaiate, J.; Sluys, L.J.; Júlio, E.http://www.sciencedirect.com/science/article/B6V2R-4VGX7RY-1/2/08a2ca3ad849c1cb32c40baa9e5ca1f9
Arbitrary bi-dimensional finite strain crack propagation
Areias, P.; D. Dias-da-Costa, P; Alfaiate, J.; Júlio, E.In the past two decades numerous numerical procedures for crack propagation have been developed. Lately, enrichment methods (either local, such as SDA or global, such as XFEM) have been applied with success to simple problems, typically involving some intersections. For arbitrary finite strain propagation, numerous difficulties are encountered: modeling of intersection and coalescence, step size dependence and ...
Bacterial handling under the influence of non-uniform electric fields: dielectr...
Fernádez-Morales,Flavio H.; Duarte,Julio E.; Samitier-Martí,JosepThis paper describes the modeling and experimental verification of a castellated microelectrode array intended tohandle biocells, based on common dielectrophoresis. The proposed microsystem was developed employing platinumelectrodes deposited by lift-off, silicon micromachining, and photoresin patterning techniques. Having fabricated the microdevice it was tested employing Escherichia coli as bioparticle model....
Vibration analysis and modal identification of a circular cable-stayed footbridge
Rebelo, C.; Júlio, E.; Varum, H.; Costa, A.Vibration measurements and modal identification were performed on a footbridge as part of the commissioning tests. The deck presents a circular configuration, in plant, and is suspended from eight cables connecting it to the extremity of a steel mast anchored to a concrete bulk situated on the riverside. The dynamic measurements were aimed to control the force installed in the cables during the tension operatio...
Caracterização mecânica de paredes de alvenaria em construções antigas: ensaios...
Vicente, R.; Silva, J.A.R. Mendes da; Varum, H.; Rodrigues, H.; Júlio, E.A reabilitação edifícios antigos, construídos com paredes de alvenaria resistentes, exige a caracterização dos materiais constituintes e das soluções construtivas existentes. A falta de conhecimento das construções antigas conduz, por vezes, a intervenções com recurso a técnicas intrusivas, descaracterizando a autenticidade do património construído. Com este trabalho pretende-se apresentar os resultados de uma ...
Feret coefficients for white self-compacting concrete
Júlio, E.; Dias, N.; Lourenço, J.; Silva, J.Abstract Several tests on white mortar, micro-concrete, concrete and self-compacting concrete, considering different additions and admixtures, were conducted to characterize white cement and determine the corresponding Feret coefficients. It was concluded that: (1) it is possible to make different mixtures of white self-compacting concrete (WSCC) with the materials adopted; (2) the method suggested by the JSC...
Studies of membrane fluidity and heart contractile force in Trypanosoma cruzi i...
Enders,Julio E; Fernández,A Ruth; Rivarola,Héctor W; Paglini,Patricia A; Palma,José AIn Chagas disease serious cardiac dysfunction can appear. We specifically studied the cardiac function by evaluating: ventricle contractile force and norepinephrine response, affinity and density of beta-adrenergic receptors, dynamic properties of myocardial membranes, and electrocardiography. Albino swiss mice (n = 250) were infected with 55 trypomastigotes, Tulahuen strain and studied at 35, 75, and 180 days ...
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