From the result,the land use of watershed becomes more reasonable,the ecology balance tends to harmonious,the proportion of agriculture-forestry-stock is adjusted from 23.32∶74.20∶2.48 to 24.23∶67.67∶8.1,the soil erosion modulus in a year falls from the original 1823t/km~2 to 1628.4t/km~2.
erosion modulus on forest land, with slope of 35 degree and vegetation cover of 70%, also adopting engineering preparation of land, was 2000~ 5000 t/km~(2), erosion was reduced by 85% ~ 95% .
Preliminary Research for Measuring the Displacement and Elastic Modulus by Using the Laser Speckle Method in Structural Model Test of Brittle Materials
With modulus m → 1 or m → 0, these solutions degenerate into corresponding solitary wave solutions, shock wave solutions and trigonometric function solutions.
This study investigated the dynamic modulus of elasticity (DMOE) of wood panels of Fraxinus mandshurica, Pinus koraiensis, and Juglans mandshurica using the natural frequency measurement system of fast Fourier transform (FFT).
Fineness modulus (F. M.) has served as an index of fineness of aggregates since it was first introduced by Prof. Duff A. Abrams in 1918. In the concrete mix design, the F. M. of sand governs the sand content and hence the proportions of other ingredients. But there are undesirable features in F. M.: it does not represent the grading of sand and manifests no significant physical concept.Prof. suggested an "average diameter" (d_(cp)) in 1943 as a measure of fineness of sand. In 1944, d_(cp) was adopted ...
The softening point and Young's modulus of polymethylmethacrylate at low temperature with various contents of dibutyl phthalate have been measured by using a consistometer and a dilatometer respectively. The relationship between the molar con- centration of dibutyl phthalate, N, and the softening point, T, can be expressed by the equation T=112-947N. An explanation for the difference between the coefficient 947 and the value 228-232, previously obtained by Zhurkov, is suggested. The addition of 1% or...
An investigation of the rheological relationships between shear stress shear rate apparent bulk viscosity temperature was carried out by examining the viscous flow of slightly milled native Hevea rubber (i) The Eisenschitz's equation for non-Newtonian flow has been verified by the experiments on the dependence of shear rate on shear stress. By this equation, the apparent viscosity can be referred to the Newtonian viscosity η_0 (at σ=0). The parameter (G_i=3.30×10~5 dynes/cm~2), interpreted as an internal...