Searched for:
(1 - 20 of 89)

Pages

document
Moors, Gunther (author), Kassapoglou, C. (author), de Almeida, Sergio Frascino Müller (author), Ferreira, Clovis Augusto Eça (author)
A process to efficiently design composite wing boxes is presented. It uses analytical and semi-empirical equations for failure modes such as material strength, plate buckling, stiffener column buckling and stiffener flange or web crippling. Laminate layups for the different components are selected in accordance with basic engineering rules...
journal article 2019
document
Hou, F. (author), Wang, W. (author), Lin, Tingyu (author), Cao, Liqiang (author), Zhang, G.Q. (author), Ferreira, J.A. (author)
In this paper, a novel fan-out panel-level printed circuit board (PCB) embedded package technology for silicon carbide (SiC) MOSFET power module is presented to address parasitic inductances, heat dissipation, and reliability issues that are inherent with aluminum wires used in conventional packaging scheme. To withstand high temperature...
journal article 2019
document
Ferreira, Débora (author), Silva, Ana P. (author), Luzia De Nóbrega, F. (author), Martins, Ivone M. (author), Barbosa-Matos, Catarina (author), Granja, Sara (author), Martins, Sandra F. (author), Baltazar, Fátima (author), Rodrigues, Ligia R. (author)
Colorectal cancer is frequently diagnosed at an advanced stage due to the absence of early clinical indicators. Hence, the identification of new targeting molecules is crucial for an early detection and development of targeted therapies. This study aimed to identify and characterize novel peptides specific for the colorectal cancer cell line...
journal article 2019
document
Shen, Y. (author), Lindenbergh, R.C. (author), Wang, Jinguo (author), Ferreira, Vagner G. (author)
Bricks are the vital component of most masonry structures. Their maintenance is critical to the protection of masonry buildings. Terrestrial Light Detection and Ranging (TLidar) systems provide massive point cloud data in an accurate and fast way. TLidar enables us to sample and store the state of a brick surface in a practical way. This...
journal article 2018
document
Shen, Y. (author), Wang, Jinguo (author), Lindenbergh, R.C. (author), Hofland, B. (author), Ferreira, Vagner G. (author)
The use of a terrestrial laser scanner is examined to measure the changes of rock slopes subject to a wave attack test. Real scenarios are simulated in a water flume facility using a wave attack experiment representing a storm of 3000 waves. The stability of two rock slopes of different steepness was evaluated under the set conditions. For...
journal article 2018
document
Ferreira, Guilherme (author), Lin, Dong Qiang (author), Ottens, M. (author)
Expanded bed adsorption (EBA) emerged in the early 1990s in an attempt to integrate the clarification, capture and initial product concentration/purification process. Several mathematical models have been put forward to describe its operation. However, none of the models developed specifically for EBA allows simultaneous prediction of bed...
journal article 2018
document
Manoj Mandru, Prabu Sai (author), Leuthold, Rachel (author), Schmehl, Roland (author), Ferreira, Carlos (author)
conference paper 2017
document
Hailu, T.G. (author), Mackay, L.J. (author), Ramirez Elizondo, L.M. (author), Ferreira, J.A. (author)
This paper describes the behavior of voltage weak DC distribution systems. These systems have relatively small system capacitance. The size of system capacitance, which stores energy, has a considerable effect on the value of fault currents, control complexity, and system reliability. A number of potential definitions of voltage weak DC...
journal article 2017
document
Liu, D. (author), Polinder, H. (author), Abrahamsen, Asger Bech (author), Ferreira, J.A. (author)
This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies....
journal article 2017
document
Prasanth, V. (author), Bandyopadhyay, S. (author), Bauer, P. (author), Ferreira, J.A. (author)
This paper deals with a generic methodology to evaluate the magnetic parameters of contactless power transfer systems. Neumann's integral has been used to create a matrix method that can model the magnetics of single coils (circle, square, rectangle). The principle of superposition has been utilized to extend the theory to multi-coil...
journal article 2017
document
Wang, X. (author), Liu, D. (author), Lahaye, D.J.P. (author), Polinder, H. (author), Ferreira, J.A. (author)
The brushless doubly-fed induction machine (DFIM) has great potential as a variable-speed generator for wind turbine applications. This special machine has a richer space-harmonic spectrum due to its special nested-loop rotor construction compared with conventional induction machines. It may result in higher iron losses, higher torque ripple and...
conference paper 2017
document
Matias, Ana (author), Carrasco, Ana Rita (author), Loureiro, Carlos (author), Andriolo, Umberto (author), Masselink, Gerd (author), Guerreiro, Martha (author), Pacheco, A (author), McCall, R.T. (author), Ferreira, Óscar (author), Plomaritis, Theocharis A. (author)
Overwash hydrodynamics datasets are mixed in quality and scope, being hard to obtain due to fieldwork experimental difficulties. Aiming to overcome such limitations, this work presents accurate fieldwork data on overwash
hydrodynamics, further exploring it to model overwash on a low-lying barrier island. Fieldwork was performed on Barreta...
conference paper 2017
document
Wang, X. (author), Liu, D. (author), Lahaye, D.J.P. (author), Polinder, H. (author), Ferreira, J.A. (author)
Permanent-magnet machines with fractional slot concentrated windings are easy to manufacture. Their popularity therefore is steadily increasing. Without a proper design, however, the induced eddy-current losses in the solid rotor get rather high. The modeling and the prediction of eddy-current losses for these machines are thus very important...
conference paper 2016
document
Strous, T.D. (author), Shipurkar, U. (author), Polinder, H. (author), Ferreira, J.A. (author)
In this paper, the brushless DFIM based wind turbine drive-train topology is compared to the DFIG based and PM generator based drive-train topologies, that are most commonly applied in modern wind turbines. The comparison will be based on a 3:2MW case study wind turbine. By using FE based multi-objective optimization, optimized generator designs...
journal article 2016
document
Shipurkar, U. (author), Polinder, H. (author), Ferreira, J.A. (author)
Availability is an important factor to be considered when designing wind turbine generator systems. The quest for increasing availability is based on the following five design approaches - design for component reliability, active control for reliability, design for fault tolerance, prognostics, and design for maintainability. This paper reviews...
journal article 2016
document
Ferreira, J.P. (author), De Breuker, R. (author)
This study describes the development of a morphing wing concept for a Portuguese Air Force Unmanned Air Vehicle (UAV), the UAS-30. Nowadays, optimized fuel efficiency is a primary requirement in the aerospace industry, and it can be significantly improved by designing adaptive wings which can change their shape in flight to achieve better...
conference paper 2016
document
Ferreira, D. (author), Kikstra, W.P. (author)
Fiber models for beam and shell elements allow for relatively rapid finite element analysis of concrete structures and structural elements. This project aims at the development of the formulation of such elements and a pilot implementation. The reduction of calculation time and degrees of freedom and the few required input variables are...
report 2015
document
Katsigiannis, G. (author), Schweiger, H.F. (author), Ferreira, P. (author), Fuentes, R. (author)
This paper focuses on the derivation of design prop loads for supported excavations in stiff clay with increasing excavation depth and number of prop levels. For multi-propped walls there are a number of empirical graphs to obtain the design prop forces. CIRIA C517 (Twine & Roscoe, 1999) enhancing Terzaghi & Peck's work (Terzaghi & Peck (1967)...
conference paper 2015
document
Ferreira, D. (author)
Fiber models for beam and shell elements allow for relatively rapid finite element analysis of concrete structures and structural elements. This project aims at the development of the formulation of such elements and a pilot implementation. Standard nonlinear fiber beam formulations do not account for shear effects and cannot capture all failure...
report 2015
document
Mackay, L.J. (author), Hailu, T.G. (author), Chandra Mouli, G.R. (author), Ramirez Elizondo, L.M. (author), Ferreira, J.A. (author), Bauer, P. (author)
The traditional ac power system is challenged by the increased amount of distributed energy resources. Enormous changes and investments are necessary in order to achieve an ac smart grid capable of coping with the challenges introduced. In dc, solutions seem to be more straightforward since most of the distributed energy sources and most of the...
conference paper 2015
Searched for:
(1 - 20 of 89)

Pages