Fractal Geometry / Organic Chemistry / Magnetohydrodynamics / Astrophysical Plasma / Active Galactic Nuclei / Black Hole / Density gradient / Spectrum / Seyfert galaxies / High Density Concrete / Scaling Law / Broad Line Region / X ray Absorption / Duty Cycle / Black Hole / Density gradient / Spectrum / Seyfert galaxies / High Density Concrete / Scaling Law / Broad Line Region / X ray Absorption / Duty Cycle