Teste de espécies/procedências de pinus no planalto do Tapajós, Pará.

bitstream/item/42018/1/Boletim-Pesquisa-105-CPATU.pd

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

A evolução do conhecimento sobre o paricá para reflorestamento no Estado do Pará.

bitstream/item/18806/1/com.tec.158.pd

A Study Focus on Concrete Replacing LD Slag as Fine Aggregate

Concrete is a composite material composed of fine and coarse granular aggregate (which acts as a filler material) embedded in a hard matrix of cement (which acts as binder) that fills the space among the aggregate particles and glue them together. The main constituents being cement, fine aggregate (river sand), coarse aggregate and water. The increase in cement production and its USAge and also its impact on the environment is addressed widely throughout the world in recent years, which gave light to researches to use alternative materials to cement such as fly ash, silica fume, ggbs etc. But now the focus is also on the increase in demand of the other constituent materials of concrete such as fine and coarse aggregate. Following the same lines of research and in a verge to find a new alternative material for river sand which is available in sufficient quantity in India and other countries also as a potential to be use as sand in concrete as resulted in using LD slag ( granulated blast furnace slag) as a fine aggregate in concrete

Espécies florestais nativas e exóticas: comportamento silvicultural no planalto do Tapajós - Pará.

bitstream/item/58704/1/CPATU-Doc49.pd

Conservação de recursos fitogenéticos em quintais agroflorestais em Mazagão, Amapá.

O objetivo do trabalho foi estudar quintais agroflorestais quanto à conservação de recursos genéticos vegetais em Mazagão. Foi realizado o levantamento da composição botânica de quatro quintais, sendo três em área de terra firme e um em várzea. O número de famílias variou de 13 a 31, com intervalo de 26 a 63 espécies. As espécies frutíferas foram as mais frequentes em todos os quintais estudados e quando somadas às madeiráveis e medicinais totalizavam cerca de 90% de toda a composição botânica encontrada