40 research outputs found
Light and tree size influence belowground development in yellow birch and sugar maple
The effects of light and tree size on the root architecture and mycorrhiza of yellow birch (Betula alleghaniensis Britton) and sugar maple (Acer saccharum Marsh) growing in the understory of deciduous forests in southern Qu
Maximising the benefits of hydropower by developing the North-West England hydro resource model
The function cost of low power three-phase squirrel-cage induction motors.
This short paper looks at the function costing of low-power, three-phase squirrel-cage induction motors. Function costing is the estimation of the costs of engineering systems from the quantified functions performed by their elements. For the motors considered, the cost is largely proportional to the full-load output torque, with only a small variation attributable to the pole number. However, two-pole motors are an exception; they cost up to 70% more per unit torque. An explanation of this result is proposed. At the date of the prices used ( February 1992), the approximate price of the sampled motors with four or more poles is 61 + 5.30 per newton metre of output torque, and that of the two-pole motors is 49 + 9.60 per newton metre
A comparative study of wave energy technologies, public workshop: ‘making waves: the economic and social impacts of marine renewables.
The impact of elevated ozone and carbon dioxide on Acer saccharum seedlings
International audienc