Active control 2 Anodes 2 Array processing 2 Biogas 2 Carbon dioxide 2 Carbonaceous compounds 2 Catalyst activity 2 Catalysts 2 Catalytic behavior 2 Catalytic performance 2 Ceria based materials 2 Ceria-based materials 2 Compact devices 2 Demodulation 2 Digital storage 2 Electrodes 2 Embedded device 2 Feed compositions 2 Field programmable gate arrays (FPGA) 2 Fuel cells 2 Graphical user interfaces 2 Greenhouse gases 2 Laser spectroscopy 2 Lock-in amplifier 2 Locks (fasteners) 2 Methane 2 Optical variables measurement 2 Pound-Drever-Hall 2 Programmed operations 2 Proportional control systems 2