Compressive strength contribution analyses of silica fume and crush quartz in RPC;

The strength contribution to the cement-fly ash cementitious system can be acquired by comparing the compressive strength of pure cement paste in which the inert powder material is added and that in which the inert powder material is not added.

The author report the indoor and outdoor concentration of?(~(222)Rn) and it's decay products in tens of houses in a community of Changsha city,and gave the relative contribution of different ?(~(222)Rn) source in different kinds of houses.

A micro plot experiment and a root barrier technique were employed to investigate the intercropping advantage and the relative contribution of aboveground and under-ground interactions to the yield and nutrient uptaking in the wheat-maize intercropping system with or without plastic sheet mulching.

Analysis on the Cultural Contribution and Academic Value of Hui Antithetical Couplet;

The cultural contribution of the etching industry is that it popularizes culture and knowledge,meets the cultural and practical demand of the mass people.

Grain phosphorus is active,and quantitative indexes,such as pozzolanic effect specific strength,strength contribution rate,activity index and pozzolanic effect form,can be used to judge and analyze phosphorus' pozzolanic effect,influence factors and the pattern in hardened phosphorus paste.