Gamma-ray emitters bounce atomic particles off rock formations to see the size, density and flow of oil reservoirs.

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United Technologies is a fuel cell leader, and David Parekh, director of the United Technologies Research Center, says that expertise has allowed the company to improve the energy density of a standard flow battery by 10 times, albeit on a small scale.

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Power density refers to the energy flow that can be harnessed from a given unit of volume, area or mass.

FORBES: Magazine Article

He is creating computer simulations to model the liver, so optimum channel size, flow rate and density of cells can be calculated as accurately as possible, before the artificial liver is constructed in the laboratory.

BBC: NEWS | Health | Glass liver may aid disease fight