material CNT metal
stress  linear
  modulus  0.00025
  possions_ratio 0.25
end
electric_field linear
permittivity 1.0
end
##electron_density identity
##end
mass_density
#electron_density exponential
# intrinsic_concentration 0.0001
# intrinsic_energy 1.0
# reference_temperature 300
#end
body_force
end