Q. Ra is the arithmetical mean roughness of a surface. Does Ra have units associated with it (i.e., inches, microns, etc.), or is it a unitless number?David ArnoldPlastic Mfg. - Minden, Nebraska2000publicly reply to David ArnoldA. David: Surface roughness values, including Ra need a ...
The spatial distribution of geological units in the surface layer was used to represent the spatial heterogeneity of parameters, such as the Manning roughness coefficients and the infiltration fractions. The calibrated model simulates adequately the measured heads, as well as the spatially variable flow...
SCREEN FOR IMAGE LIGHT PROJECTION AND DISPLAY SYSTEM An image light projection screen has a plurality of aperiodic lens array units on a main surface. The aperiodic lens array units are arrayed two-dimensiona... A Koyanagi,T Nomura,K Miyasaka 被引量: 0发表: 2017年 加载更多研究...