2013
Autores
Nunes, LJR; Matias, JCO; Catalao, JPS;
Publicação
2013 INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY RESEARCH AND APPLICATIONS (ICRERA)
Abstract
The use of biomass as energy source becomes considered again as a possibility, after a period in which practically felt in disuse, especially in industrial environments. Nowadays is becoming again an alternative, mainly due to the increasing prices of fossil fuels, especially oil and natural gas, as well as by the growing environmental and sustainability concerns, since the biomass fuel is considered neutral in terms of CO2 emissions. The use of biomass as solid fuel presents logistic difficulties, which do not allow their straightforward dissemination in all industrial units that intend to change its fuel. However, counterbalanced by excellent results from the economical point of view, achieved due to the stability of biomass prices in Portugal, the application of biomass is envisaged in this paper as a sustainable alternative to fossil fuels for the Portuguese textile industry. Hence, a real case study is provided to discuss advances and developments in the field of biomass applications.
2013
Autores
Pandey, SK; Mohanty, SR; Kishor, N; Catalao, JPS;
Publicação
TECHNOLOGICAL INNOVATION FOR THE INTERNET OF THINGS
Abstract
This paper proposes a load frequency control scheme for an autonomous hybrid generation system consisting of wind turbine generator (WTG), diesel engine generator (DEG), fuel cell (FC), aquaelectrolyzer (AE) and battery energy storage system (BESS). In wind power generation systems, operating conditions are changing continually due to wind speed and load changes, having an effect on system frequency. Therefore, a robust controller is required for load frequency control. The control scheme is based on Linear Matrix Inequality (LMI)-Linear Quadratic Regulator (LQR). The control optimization problem is obtained in terms of a system of LMI constraints and matrix equations that are simultaneously solved. The proposed load frequency control scheme with the advanced LMI-based-LQR (ALQR) design is applied for the autonomous hybrid generation system. The effectiveness and robustness of the proposed controller is demonstrated for different load and wind power perturbations. The results suggest superior performance of the proposed ALQR controller against an optimal output state feedback controller. The integrated control could be realized though the web by applying Internet of Things technologies within the future smart grid.
2013
Autores
Pereira, P; Leitao, S; Solteiro Pires, EJS;
Publicação
2013 1ST BRICS COUNTRIES CONGRESS ON COMPUTATIONAL INTELLIGENCE AND 11TH BRAZILIAN CONGRESS ON COMPUTATIONAL INTELLIGENCE (BRICS-CCI & CBIC)
Abstract
This paper makes a study about optimal supply of the energy service, using simulations of network operation scenarios, in order to optimize resources and minimize the variables: operation cost, energy losses, generation cost and consumers shedding. These simulations create optimal operation models of the network, allowing the system operator obtain knowledge to take pre-established procedures that must be performed in situations of contingency in order to forecast and minimize drawbacks. The simulations were performed using a multiobjective particle swarm optimization algorithm. The algorithm was applied to the IEEE 14 Bus network where the optimal power flow was evaluated by MATPOWER tool to establish an optimal electrical working model to minimize the associated costs.
2013
Autores
Carneiro, LM; Soares, AL; Patrício, R; Azevedo, AL; de Sousa, JP;
Publicação
INTERNATIONAL JOURNAL OF COMPUTER INTEGRATED MANUFACTURING
Abstract
This paper presents part of the findings of a research project aiming at characterising high-performance collaborative business networks and at defining the conditions required for their creation and management. The project adopted a multiple case study research strategy and three different business networks are presented in this paper. Empirical studies have been performed in Northern Portugal. The results of the study include operational definitions based on a comprehensive literature review, a conceptual reference framework for the analysis of high-performance collaborative networks and recommendations for the creation and management of such networks.
2013
Autores
Martins, DA; Goncalves, R; Branco, F;
Publicação
PROCEEDINGS OF THE 2013 8TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI 2013)
Abstract
Organizations are increasingly concerned with process optimization, thus aiming on gaining competitive advantages in the market. Inherent to any business, company or institution there is a constant document creation, manipulation and treatment flow. In many cases a real bureaucratic chaos. These processes involve great efforts in terms of human resources and are highly susceptible to errors. Sousacamp is a group of companies in the agrifood area that are geographically distributed throughout the Iberian Peninsula. Given that the group companies buy and sell from each other, the paper volume inherent to documenting these transactions is significantly high. This paper presents a documental integration strategy supported on the development of an application using ASP, .NET and C#
2013
Autores
Ribeiro, RSR; Jorge, PAS; Guerreiro, A;
Publicação
8TH IBEROAMERICAN OPTICS MEETING AND 11TH LATIN AMERICAN MEETING ON OPTICS, LASERS, AND APPLICATIONS
Abstract
The intensity profile of a focused beam of light can exert small drift forces on particles with a few microns and even smaller, which can be used to confine or manipulate them. Optical trapping has several applications, in particular it has been adopted as a powerful tool in biology, allowing, for instance to manipulate in vivo single cells. A wide variety of optical setups have been implemented to optically trap microscopic bodies, however, the single beam trap using a tightly focused Gaussian beam continues to be the most used. Recent developments introduced an alternative to bulk optical trapping systems based on lensed optical fibers. This work presents simulations showing new designs of fiber optic and 2D waveguide tweezers based on studies of the forces acting on dielectric particles immersed in media with a distinct refractive index, which take into account the refractive index and structure of the particles.
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