An expansion wave in accelerating flow broadens.
At the end of february, the bract attained approximately their full size, and a pair of anatropous ovules were initiated on the adaxial surface at the base of the fertile ovuliferous scale
This kind of expansion, made without adding heat, is called an adiabatic expansion.
The result of experiment shows that und er the conditions of proper ai r - entraining, concrete with 20 % fly ash has excellent frost - resistance. the frost - resistance of concrete with 55 % fly - ash which is admixed with united expansive agent ( uea ) has been improved greatly. the frost - resistance of sulfate aluminate cement concrete with high volume of fly - ash is dramatically lower than that of silicate cement concrete with the same volume of fly - ash
For thirty years, the institute has been engaged in geological prospecting for alunite, illite, pyrite, bentonite, fluorite, phosphate rock, sericite etc, has completed and submitted more than 70 geological reports