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Ferreira, D.S. (author), Mirkovic, J. (author), Wolffenbuttel, R.F. (author), Correia, J.H. (author), Feld, M.S. (author), Minas, G. (author)A strategy for spectroscopy tissue diagnosis using a small number of wavelengths is reported. The feasibility to accurately quantify tissue information using only 16 wavelengths is demonstrated with several wavelength reduction simulations of the existing esophageal data set. These results are an important step for the development of a...journal article 2011
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Bijlsma, D. (author), Ferreira, M.A. (author), Luijten, B. (author), Visser, J. (author)We performed an empirical study of the relation between technical quality of software products and the issue resolution performance of their maintainers. In particular, we tested the hypothesis that ratings for source code maintainability, as employed by the Software Improvement Group (SIG) quality model, are correlated with ratings for issue...journal article 2011
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Akay, B. (author), Micallef, D. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author)This paper sets out to describe the measurements and computations to construct three components of velocity field around the blade. The primary aim of the measurements was to gain insight into the physics of the flow field produced by a horizontal axis wind turbine-HAWT blade. Stereo Particle Image Velocimetry experiments were performed on a two...conference paper 2011
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Van der Pijl, F.F.A. (author), Ferreira, J.A. (author), Bauer, P. (author), Castilla, M. (author)The invention relates to an adaptive controlling method for controlling energy- supplied by an electrical source (14) to a resonance tank (Cr, Lr) that is connectable to an electric load (13a, 13b). The method comprises the step of determining an energy amount to be supplied to the tank (Cr, Lr), based on information of energy in the resonance...patent 2011
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Micallef, D. (author), Kloosterman, M. (author), Ferreira, C.S. (author), Sant, T. (author), Van Bussel, G.J.W. (author)The primary objective of the MEXICO (Model Experiments in Controlled Conditions) project was to generate experimental data for validation of models for wind turbines. Kulite©pressure sensors were used for pressure measurements while Particle Image Velocimetry was used with the aim of tracking the tip vortex trajectory. The pressure measurements...conference paper 2010
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Akay, B. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author)Several methods from experimental to analytical are used to investigate the aerodynamics of a horizontal axis wind turbine. To understand 3D and rotational effects at the root region of a wind turbine blade, correct modeling of the flow field is essential. Aerodynamic models need to be validated by accurate experimental data. In this paper, the...conference paper 2010
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Ferreira, C. (author), Hofemann, C. (author), Dixon, K. (author), Van Kuik, G.A.M. (author), Van Bussel, G.J.W. (author)The Vertical Axis Wind Turbine, in its 2D form, is characterized by a complex unsteady aerodynamic flow, including dynamic stall and blade vortex interaction. Adding to this complexity, the 3D flow causes spanwise effects and the presence of trailing vorticity and tip vortices. The objective of the current paper is to bring insight into the 3D...conference paper 2010
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Ani, S.O. (author), Polinder, H. (author), Ferreira, J.A. (author), Ockels, W.J. (author)This paper discusses the possibilities of applying high temperature superconducting (HTS) synchronous motor to Superbus, an alternative and sustainable type of public transportation developed at TU Delft. Two important factors within the Superbus drive that influence the operating range are weight and efficiency: increasing the weight results in...conference paper 2009
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Baalbergen, F. (author), Bauer, P. (author), Ferreira, J.A. (author)Diesel generators in small electricity grids are mostly not used in a very efficient way. The reason for this is twofold. First of all, the efficiency of a diesel generator is dependent on the ratio determined by the average power divided by the peak power of the generator. The smaller this ratio is, the lower the efficiency. Furthermore, some...journal article 2009
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- Bang, D. (author), Polinder, H. (author), Shrestha, G. (author), Ferreira, J.A. (author) conference paper 2009
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Shrestha, G. (author), Polinder, H. (author), Bang, D. (author), Jassal, A.K. (author), Ferreira, J.A. (author)A direct drive generator used in wind turbine has high energy yield compared to other drivetrain topologies and low maintenance is expected as the technology matures. On the other hand direct drive generator weight and size increases rapidly when scaled up to larger units. This paper will investigate the possibility of weight reduction of large...conference paper 2009
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Zhou, Y. (author), Bauer, P. (author), Ferreira, J.A. (author), Pierik, J. (author)Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent...journal article 2009
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Zhao, D. (author), Ferreira, J.A. (author), Roc'h, A. (author), Leferink, F. (author)Filters used in electromagnetic interference suppression are often described in literature on drive systems and have become a standard solution in industry. The effect of the commercial off-the-shelf filter depends significantly on how it is installed. A model that includes the installation parameters is made first and then the parameters of the...journal article 2009
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Ferreira, J.A. (author), Yuan, Z. (author), De Haan, S.W.H. (author)The invention relates to a power flow controller, comprising at least one first converter coupled with a power transmission line, and at least one second converter coupled with a power source, wherein said power source operates at a predeter-mined first frequency and connects to the power transmission line, said controller further comprising...patent 2008
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De Jong, E.C.W. (author), Ferreira, B.J.A. (author), Bauer, P. (author)A means for power electronics to exploit the level of 3-D packaging already being implemented in compact consumer products, such as digital cameras, is investigated in order to increase its power density. The increase in functionality and usage of printed circuit board (PCB) in power electronic converters is highlighted and improvements proposed...journal article 2008
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Sousa Santos, B. (author), Dias, P. (author), Pimentel, A. (author), Baggerman, J.W. (author), Ferreira, C. (author), Silva, S. (author), Madeira, J. (author)Virtual Reality (VR) has been constantly evolving since its early days, and is now a fundamental technology in different application areas. User evaluation is a crucial step in the design and development of VR systems that do respond to users’ needs, as well as for identifying applications that indeed gain from the use of such technology. Yet,...journal article 2008
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Kruit, P. (author), Ferreira, J.A. (author)The invention relates to compensation device for a magnetic field generated through electric traction in a tram or train transport system that comprises an overhead line and rails, the overhead line and rails during operation being live, wherein a predetermined section of the overhead line and rails is provided with adjacent circuits, each of...patent 2007
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Dias, P. (author), Pimentel, A. (author), Ferreira, C. (author), Van Huussen, F. (author), Baggerman, J.W. (author), Van der Horst, P. (author), Madeira, J. (author), Bidarra, R. (author), Sousa Santos, B. (author)Virtual and Augmented Reality are developing rapidly: there is a multitude of environments and experiments in several laboratories using from simple HMD (Head-Mounted Display) visualization to more complex and expensive 6-wall projection CAVEs, and other systems. Still, there is not yet a clear emerging technology in this area, nor commercial...conference paper 2007
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- Van der Pijl, F.F.A. (author), Bauer, P. (author), Ferreira, J.A. (author), Polinder, H. (author) conference paper 2007
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- Ferreira, C.J.S. (author), Bijl, H. (author), Van Bussel, G. (author), Van Kuik, G. (author) journal article 2007