On the grain size proportionality constants calculated in M.I. Mendelson's “Average Grain Size in Polycrystalline Ceramics”

In 1969, M.I. Mendelson published a paper in the Journal of the American Ceramic Society that introduced a proportionality constant of 1.558 for estimating the average 3D grain size from the mean 2D lineal intercept under the assumption of lognormally distributed grains. Recent simulations by the authors revealed that the lognormal parameterization in the original work actually calculates the median grain size instead of the mean. The relationship between the mean caliper diameter and mean lineal intercept was found to be 1.60 when using common parameterizations. In addition, it is demonstrated through simulations that the correct proportionality constant can range from 1.776 to below unity depending on a material's grain size dispersion, such that 1.60 should only be used as a crude approximation.     

“M.S.Q”与“改良A.D.A”对比中试小结

我厂是以煤为原料的中型氨厂。半水煤气中H_2S的脱除,曾经使用“氨水液相催化法”。由于该法适应不了本厂扩大再生产的需要,83年12月大修后采用“M.S.Q.”法。运行两年多来,尚能满足年产7万吨合成氨生产的要求.但亦存在净化度不稳定的现象.为探明原因,于85年7月在中试设备上