a | fiber radius dimensionless |

b | cell radius dimensionless |

b | bias of i-th neuron in the j-th layer |

D | Brownian diffusion coefficient |

e | error between the desired and the obtained output |

F | activation function of i-th neuron in the j-th layer |

n | particle concentration |

n | particle concentration at location D |

n | particle concentration at location R |

n | particle concentration at location U |

Pe | Peclet number (= 2aU/D) |

R | polar coordinate dimensionless |

R | correlation coefficient |

s | output of i-th neuron in the j-1-th layer |

s | output of i-th neuron in the j-1-th layer |

U | flow velocity scale |

u | radial gas velocity |

u | angular gas velocity |

v | advection velocity |

v | activation potential |

w | weights of i-th neuron in the j-th layer (the second subscript k indicates the neuron in the (j − 1)-th layer from which the connection is being established) |

w | weights of i-th neuron in the k-th layer (the second subscript j indicates the neuron in the k-th layer from which the connection is being established) |