Dynamics of heterotrophic bacteria and ammonification in biofilms associated with two carriers;

By testing the concentration changes of NH4+N, NO2 N and NO3N in water the performances of the three materials were determined that the biofilms adhering to the three materials had the similar maturation process and maturation time, and the ammonification rates of the biofilms on the three media were 20.

The field and pot experiments were conducted to investigate the change law of ammonification and nitrification intensity of the soil nitrogen in tobacco field at different growth stages under different application amounts and effects of different soil types on change of ammonification and nitrification intensity of the soil nitrogen.

The experimental result show that the diffuse treatment on Si3N4 ceramic and metal in brazing joint has strengthening effect.

The stress rupture properties of four batches of experimental single crystal superalloys containing various levels of Re were tested at 1100℃/140MPa,and the strengthening effects of Re on the stress rupture properties of single crystal superalloys at elevated temperature were investiga-ted.

The strengthening effects of Al-Zr-Cr-La dispersoids to Al-Mg alloys have investigated.