A Dynamic Theory of Resource Wars

We develop a dynamic theory of resource wars and study the conditions under which such wars can be prevented. Our focus is on the interaction between the scarcity of resources and the incentives for war in the presence of limited commitment. We show that a key parameter determining the incentives for war is the elasticity of demand. Our first result identifies a novel externality that can precipitate war: price-taking firms fail to internalize the impact of their extraction on military action. In the case of inelastic resource demand, war incentives increase over time and war may become inevitable. Our second result shows that in some situations, regulation of prices and quantities by the resource-rich country can prevent war, and when this is the case, there will also be slower resource extraction than the Hotelling benchmark (with inelastic demand). Our third result is that because of limited commitment and its implications for armament incentives, regulation of prices and quantities might actually precipitate war even in some circumstances where wars would not have arisen under competitive markets

Consórcio temporário de espécies florestais nativas com caupi no planalto do Tapajós - PA.

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Ensaio de espécies florestais no planalto do Tapajós.

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Alternativa agroflorestal para pequenos produtores agrícolas em áreas de terra firme do município de Santarém, Pará.

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Periapical Inflammation Affecting Coronally-inoculated Dog Teeth with Root Fillings Augmented by White MTA Orifice Plugs

Placement of orifice plugs has been suggested to augment the seal of conventional root canal fillings. This study assessed in vivo the efficacy of white mineral trioxide aggregate (MTA) plugs in preventing periapical inflammation subsequent to coronal inoculation of root-filled teeth. The two-rooted mandibular premolars of six beagle dogs were conventionally prepared and filled with gutta-percha and sealer. A white MTA orifice plug was placed into one canal in each tooth. Pulp chambers were inoculated with plaque except for 12 teeth (negative control), and restored. Radiographs were taken at regular intervals. At 10 months, dogs were killed and jaw blocks processed for histology. None of the roots revealed radiographic or histologic evidence of severe inflammation. Mild inflammation was observed in 17% and 39% of the roots with and without an orifice plug, respectively (McNemar, p > 0.05). Without development of severe inflammation, the seal augmentation efficacy of MTA orifice plugs could not be determined.http://www.sciencedirect.com/science/article/B82X7-4HTKDRJ-4/1/e66ff096349fc9e67875bd1796a948b

Augmented Reality for Real-time Navigation Assistance to Wheelchair Users with Obstacles' Management

International audienceDespite a rapid technological evolution in the field of technical assistance for people with motor disabilities, their ability to move independently in a wheelchair is still limited. New information and communication technologies (NICT) such as augmented reality (AR) are a real opportunity to integrate people with disabilities into their everyday life and work. AR can afford real-time information about buildings and locations' accessibility through mobile applications that allow the user to have a clear view of the building details. By interacting with augmented environments that appear in the real world using a smart device, users with disabilities have more control of their environment. In this paper, we propose a decision support system using AR for motor disabled people navigation assistance. We describe a real-time wheelchair navigation system equipped with geological mapping that indicates access path to a desired location, the shortest route towards it and identifies obstacles to avoid. The prototyped wheelchair navigation system was developed for use within the University of Lille campus

Contribuições do projeto Silvicultura Tropical - Cooperação Internacional Brasil/Reino Unido.

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Bases técnicas e referenciais para o programa de restauração florestal do Pará: um bilhão de árvores para a Amazônia.

Bases conceituais e definições; Características do programa; Referencial para a estruturação do programa; Ações estruturantes; Monitoramento e avaliação do programa; Parcerias e articulações intersetoriais e interinstitucionais.bitstream/item/117238/1/Revista-para-Desenvolvimento-No.-2-Bilhao-de-Arvores.pd