Energy complementarity can be a tool for managers to prioritize investments in new power generation ventures. An index for complementarity assessment should allow comparison of complementarities at different sites. This article proposes a new method for the calculation of complementarity index, allowing the comparison two energy resources and also allowing the comparison of more than two energy resources. In addition, the proposed index still allows the use of hourly or daily series and not only maximum or minimum values. Finally, this article also presents a map for the state of Rio Grande do Sul, the southernmost state of Brazil, indicating the energetic complementarity in time between hydropower, wind energy and PV solar energy.

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Abstract-In this work, a spherical shape portable data acquisition system capable of sensing compression and impact forces along the three Cartesian axes is presented. The developed instrument was validated in several different experiments of fruit packinghouses during the post harvest process in order to check the mechanical damages they suffer. It is a microcontroller embedded system that acquires data from four sensors (accelerometers, load cells, temperature and humidity). A Flash memory is used for data storage and a radio frequency transceiver and a universal serial bus (USB) communication port are provided to allow interface with external computers for dataprocessing and visualization. The case studies indicated strong compression and impact forces suggesting a need for changes in the mechanical and manual selection, packing and transportation of fruits. The developed device was proven to be useful, working as expected and its modular design allows future modifications. The preliminary results obtained with the instrumented sphere point to the need to more concern on damages fruits and vegetables endure along the post harvest handling chain.

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RESUMOA fim de quantificar-se e analisar-se corretamente a relação máquina agrícola-solo faz-se necessário a aquisição de dados que sejam ao mesmo tempo precisos, confiáveis, de fácil e rápida obtenção. Tal tarefa vem a ser facilitada por meio da utilização de equipamentos eletrônicos, os quais devem basear-se em três princípios básicos: precisão adequada, custo acessível e boa robustez. Devido, principalmente, ao fato das instrumentações disponíveis para a aquisição de dados com máquinas agrícolas serem de custo e manutenção bastante elevados,