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Publicações

2017

Radio-cephalic fistula recovered with drainage to forearm basilic vein

Autores
Norton De Matos, A; Sousa, CN; Almeida, P; Teles, P; Loureiro, L; Teixeira, G; Rego, D; Teixeira, S;

Publicação
HEMODIALYSIS INTERNATIONAL

Abstract
Dysfunction problems with vascular access are a concern to patients and dialysis units. The vascular surgeon should analyse such dysfunction and perform a careful assessment of the vascular network in order to find new fistula layouts. We introduce and discuss the case of creation of a radiocephalic fistula with outflow into the forearm basilic vein through rotation of the forearm basilic vein toward the cephalic vein in the forearm of an 88-year-old hemodialysis male patient. This technique enables extending fistula patency and improves cost efficiency.

2017

Optimal control of kite power systems: mesh-refinement strategies

Autores
Paiva, LT; Fontes, FACC;

Publicação
4TH INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT RESEARCH, ICEER 2017

Abstract
In this work we address the problem of generating electricity through Kite Power Systems. We solve an optimal control problem which devises the trajectories and controls for the kite that maximize the total energy produced in a given interval. This is a highly nonlinear problem for which the optimization is challenging. We use a continuous time model of the kite and implement time mesh refinement strategies to solve the problem. We report results that show that with an adaptive mesh refinement strategy the problem can be solved with a high level of accuracy and (in simplified versions) much faster. (C) 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the scientific committee of the 4th International Conference on Energy and Environment Research.

2017

Certified Password Quality

Autores
Ferreira, JF; Johnson, SA; Mendes, A; Brooke, PJ;

Publicação
Lecture Notes in Computer Science - Integrated Formal Methods

Abstract

2017

INFLUENCE OF SENSORY STIMULI ON BRAND EXPERIENCE, BRAND EQUITY AND PURCHASE INTENTION

Autores
Moreira, AC; Fortes, N; Santiago, R;

Publicação
JOURNAL OF BUSINESS ECONOMICS AND MANAGEMENT

Abstract
Sensory stimulation is used by various brands to induce desired behaviours among their customers. Although its effectiveness is recognised in business contexts, little research has been conducted on sensory marketing. In order to contribute to filling this gap, this study sought to build a model that explains how sensory stimulation influences intentions to purchase a brand. Brand experience and brand equity were expected to mediate this relationship. The empirical validation of the model was conducted by carrying out an online survey with a convenience sample of 302 customers of a brand of the catering industry. The data collected were processed using PLS-SEM methodology. The results reveal that sensory stimulation positively influences brand experience and brand equity, which, in turn, have a positive impact on intentions to purchase the brand in question. The relevant contributions that emerged from this study include not only bridging the aforementioned gap in the literature but also offering significant managerial implications.

2017

Advantages and disadvantages of using software for qualitative data analysis [Vantagens e desvantagens do uso de software na análise de dados qualitativos]

Autores
Costa, AP; Reis, LP;

Publicação
RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao

Abstract

2017

Development of an optimal and fuzzy semi-active control system for vehicle suspension

Autores
Oliveira, KF; Braz César, MT; Gonçalves, J;

Publicação
COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering

Abstract
This paper aims to evaluate the performance of a semi-active controlled suspension system using a magneto-rheological (MR) damper to provide better ride comfort and safety to vehicle passengers than an uncontrolled or passive suspension system. Passive systems represent a conventional solution for vibration control of suspension systems. Although this system is a proven, reliable and economic technology, their parameters cannot be modified according to the road conditions. On the other hand, active systems allow a continuous control of the suspension motion, but require a complex and energy demanding actuator. The proposed suspension system has the adaptability of active systems with lower energy consumption, which constitute an economic and efficient option for vibration control in vehicle suspensions. The analysis was carried out with a set of numerical simulations in Matlab/Simulink using a 1/4 vehicle suspension model with two degrees of freedom for a passive system and two semiactive control modes based on fuzzy and optimal controllers.

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