19 research outputs found
Embarcações motorizadas: uma ameaça aos peixes-boi marinhos (Trichechus manatus) no Brasil
External Debt and Foreign Investment
Trade in saving and investment, like trade in commodities, can confer considerable benefits on both borrowing and lending countries. As current account balances are the measure of this international capital transfer, it is not clear why the Australian current account deficit is viewed with such concern. It is suggested that the pegged exchange rate concept of external imbalance has been incorrectly associated with current account imbalance. The paper then explores reasons why current account deficits may be a symptom of problems elsewhere in the economy, concluding that in all cases the problem, not the symptom, should be the focus of policy action.
Variability in the mechanical properties of bone, and its evolutionary consequences
The relative variabilities (coefficient of variation (CV)) of 10 different mechanical properties of compact bone were determined from 2166 measurements. All measures of variability were made on a minimum of four specimens from any bone. Three pre-yield properties had a CV of about 12%. Six post-yield properties had CVs varying from 24 to 46%. Pre-yield properties increase as a function of mineral content, whereas post-yield properties decrease. These differences give insight into mechanical phenomena occurring at different stages during loading. Furthermore, the fact that some properties are more tightly determined than others has implications for the optimum values set by natural selection. This assertion is made more rigorous using a simple mathematical model for the evolutionarily optimal allocation in a trade-off where one property is imprecisely determined. It is argued that in general the optimum will be biased in favour of the more tightly determined properties than would be the case if all properties had the same CV