Cell count : Characterize different types of foams
Based on the size of the individual cells in the foam matrix
Expressed as either average cell diameter
Number of cells per linear distance.
Test method D3576
Cell count
Core Density : specimen of regular shape without skin
(core : the internal portion of a molded part, free of skin)
2) Section Density : specimen with skins on the top and bottom surface.
cut from a portion free of voids and defects
Density to the nearest 0.1kg/m3 , and Type of specimen, core or section.
Density
Density : M/V ⅹ106
M = mass of specimen, g
V = volume of specimen, mm3
....
[ERS]Embedded Rail System에 대해서 (ERS)Embedded Rail System
1.서론
교통하중 중 열차는 가장 충격적인 진동을 유발하고 도심지, 주택지 역사 등 사람들이 주로 거주하는 지역에서 주된 소음/진동원이다. 철로 변에서 약 60m떨어진 건물에서 측정..
TheFlight 1.원문
The Flight
Look back with longing eyes and know that I will follow,
Lift me up in your love as a light wind lifts a swallow,
Let our flight be far in sun or windy rain--
But what if I heard..