Fractures are widely distributed in coal, and studying the seepage characteristics of fluids in fractures is of great significance for unconventional natural gas extraction and prevention of gas disasters.In this work, based on the W-M fractal function, a Y-shaped fracture model with different roughness is established.The seepage characteristics of

In this paper the influence of factors affecting gynogenic response of red beet ovules is discussed.The ovule response frequencies were the highest in the following conditions: N6 (Chu 1975) mineral salts, 0.5 mg/l IAA, stc26 0.2 mg/l BA, 27 or 32oC.The influence of genotype of donor plants was confirmed and it was found that the ovules excised fro