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Nonlinear dynamics of a tightly moored point-absorber wave energy converter
Vicente, Pedro C.; Falcão, António F. de O.; Justino, Paulo AlexandreTightly moored single-body floating devices are an important class of offshore wave energy converters. Examples are the devices under development at the University of Uppsala, Sweden, and Oregon State University, USA, prototypes of which were recently tested. These devices are equipped with a linear electrical generator. The mooring system consists of a cable that is kept tight by a spring or equivalent device....
Introducing Mobile Money in Rural Mozambique: Evidence from a Field Experiment*
Batista, Cátia; Vicente, Pedro C.The limitations of access to finance in Africa, together with the recent boom in cell phone use in that continent, created high expectations regarding the introduction of mobile money in many African countries. The success story of M-PESA in Kenya raised the bar further. We designed and conducted a field experiment to assess the impact of randomized mobile money dissemination in rural Mozambique. For this purpo...
Voting and Peer Effects: Experimental Evidence from Mozambique*
Fafchamps, Marcel; Vaz, Ana; Vicente, Pedro C.Voter education campaigns often aim to increase voter particpation and political accountability. We follow randomized interventions implemented nationwide during the 2009 Mozambican elections using a free newspaper, leaflets, and text messaging. We investigate whether treatment effects were transmitted through social networks (kinship and chatting) and geographical proximity. For individuals personally targeted...
Is Information Power? Using Mobile Phones and Free Newspapers during an Electio...
Aker, Jenny C.; Collier, Paul; Vicente, Pedro C.African elections often reveal low levels of political accountability. We assess different forms of voter education during an election in Mozambique. Three interventions providing information to voters and calling for their electoral participation were randomized; an SMS-based information campaign, an SMS hotline for electoral misconduct, and the distribution of a free newspaper. To measure impact, we look at o...
Vitamin A Deficiency and Training to Farmers: Evidence from a Field Experiment ...
Caeiro, Rute; Vicente, Pedro C.Vitamin A deficiency is a widespread public health problem in Sub-Saharan Africa. This paper analyzes the impact of a food-based intervention to fight vitamin A deficiency using orange-fleshed sweet potato (OFSP). We conducted a randomized evaluation of OFSP-related training to female farmers in Mozambique, in which the treatment group was taught basic concepts of nutrition, and OFSP-planting and cooking skills...
Non-linear Slack-Mooring Modelling of a Floating Two-Body Wave Energy Converter
Vicente, Pedro C.; Falcão, António de O.; Justino, Paulo AlexandreMost floating oscillating-body wave energy converters that have been proposed and developed so far are two-body systems where the power is extracted from the relative translational motion between the two bodies. As any floating device, floating point absorbers are subject to drift forces due to waves, currents and wind, and therefore need to be kept in place by a proper mooring system. The mooring cables can be...
Optimization of mooring configuration parameters of floating wave energy converts
Vicente, Pedro C.; Falcão, António de O.; Justino, Paulo AlexandreFloating point absorbers devices are a large class of wave energy converters for deployment offshore, typically in water depths between 40 and 100m. As floating oil and gas platforms,the devices are subject to drift forces due to waves, currents and wind, and therefore have to be kept in place by a proper mooring system. Although similarities can be found between the energy converting systems and floating platf...
A time domain analysis of arrays of floating point-absorber wave energy convert...
Vicente, Pedro C.; Falcão, António de O.; Justino, Paulo AlexandreThe extensive exploitation of the offshore wave energy resource may require the deployment of dense arrays of point absorbers, the distance between elements being possibly tens of meters. In such cases, it may be more convenient and economical that only elements in the periphery of the array are directly slack-moored to the sea bottom,while the other elements are prevented from drifting and colliding by connect...
Hydrodynamics of triangular-grid arrays of floating point-absorber wave energy ...
Vicente, Pedro C.; Falcão, António de O.; Gato, L.M.C.; Justino, Paulo AlexandreIt may be convenient that dense arrays of floating point absorbers are spread-moored to the sea bottom through only some of their elements (possibly located in the periphery), while the other array elements are prevented from drifting and colliding with each other by connections to adjacent elements. An array of identical floating point absorbers located at the grid points of an equilateral triangular grid is c...
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