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Polymer membranes with molecular-sized channels that assemble themselves

Many futurists visualize a creation in which polymer membranes with molecular-sized channels are employed to seize carbon, yield solar-based fuels, or desalinating sea piss of superior, among many other functions. This will command methods by which such membranes can be willingly fabricated in magnitude quantities. A technic representing a notable first trace down that method has now been successfully demonstrated. Researchers with the U.S. Activity be contingent of Drive's Lawrence Berkeley Inhabitant Laboratory (Berkeley Lab) and the University of California (UC) Berkeley have developed a d-based method for inducing the self-congregation of ductile polymer membranes with well aligned subnanometer channels. Fully compatible with commercial membrane-constructing processes, this new style is believed to be the first exemplar of structured nanotubes fabricated into a useful membrane over macroscopic distances....

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A silicon solar cell array works at an efficiency of 8.1% in sunlight and is exposed to an average solar insol?

Sep 08, 2010 by LeoLeo | Posted in Engineering

A silicon solar cell array works at an adeptness of 8.1% in sunlight and is exposed to an average solar insolation of 230 Wm-2. If the array recoups the dash cost in 8 years, calculate the energy required to fabricate the solar cells (respond in MJ/m2).

That unexceptional insolation value is low enough that it's probably averaged over a 24-hour period already.

So I would do

3600 seconds / hour * 24 hours / day * 365 days / year * 8 years * 230 W/m^2 * 8.