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A photo of the scintillator vessel and shroud inside Borexino Solar Neutrino Detector at Gran Sasso in Italy. The detector consists of nested nylon vessels fabricated at Princeton that hold liquid scintillator.
A comparison of the ignition front dynamics for co-current and counter-current flow of hydrogen and oxygen in a Parallel Flow Channel PEM fuel cell. The color scale is for the local current density as a function of the axial position from the hydrogen inlet.
A comparison of the local current density for co-current and counter-current flow of hydrogen and oxygen in a segmented anode PEM fuel cell. Current ignition is indicated by a jump in the current from near zero to ~ 100mA.The top two are the experimental currents for co-current flows (left) and counter-current flows (right). The bottom two are reaction-diffusion model simulations.
When Princeton University engineers want to increase the power output of their new fuel cell, they just give it a little more gas -- hydrogen gas, to be exact. This simple control mechanism, which varies the flow of hydrogen fuel to control the power generated, was previously thought impossible and is a potentially major development in fuel cell technology.