effective normal stress， σ‘

General normal-normal model

Head Normal Form

normal effective stress

normal head

skew normal-normal distribution

weak head normal form

effective normal stress

effective head

normal temperature normal pressure easy-to-dye

effective lowest particle size of effective separation

the equal effective method (2nd equal effective conver-sion)

hammer head [= hammer head shark]

head to head

head to head configuration

head to head structure

head wind [= head sea]

head-to-head

head-to-head polymer