The way was inrtoduced to determining diameter series with the diameter variation coefficient.

Experimental study on relationship among runoff coefficients of different underlying surfaces,rainfall intensity and duration;

Development of runoff coefficient forecast model under simulated rainfall;

Effect of topographic form and vegetation type on the runoff coefficient in the Xiangshuihe Watershed of Liupan Mountains

To obtain the calculating formula of theoretical diameter of ramie yarn, the author tests the diameter by using the microscope projecter, determines the metric number by surveying its length and weighing it, and gets the diameter coefficient ( k =0.

Analyzing the relationship between ion concentration and pH value in acid rain in China with path coefficient;

In order to assess the relative contribution of alfalfa dry parameters choosing to the protein, the author apply path coefficient to analyze the influences of alfalfa dry parameters to the protein.

The result of path analysis indicated directly path coefficient of fertile length, ear diameter, plant height, produced grain percentage, 100 grain weight, ear length, rows per ear and grain was positive.