■周期的三重らせん構造(その49)
球の充填率は周期性らせんのみならず、非周期的らせんでも、同じ式で表されることが分かった。
ρ=r^3/h(r+1)^2・4/3
====================================
[1]正四面体の1辺を伸縮させて、正三角形面2枚と二等辺三角形面2枚からなる四面体の場合
[1] [2] [3]
arcos(-2/3)=131.8° 0.506965 0.506962 0.506961

====================================
11π/15=132° 0.504388 - -

====================================
3π/4=135° 0.471585 - -

====================================
16π/21=137.1° 0.454757 - -

====================================
2π/Φ^2=137.5° 0.452287 - -

====================================
10π/13=138.5° 0.446281 - -

====================================
4π/5=144° 0.420975

====================================
160° 0.39077

====================================
175° 0.383337

====================================