The autotrophic nitrobacteria was cultured with NaNO_2 and K_2HPO_4 as nitrogen and phosphor source respectively in the condition:pH=7.5~7.8,temperature 28 ℃,DO≥3 mg/L . Steady biofilm was formed on the surface of carbon foam, a new type material for packing.
The selection of resin materials used in glass fiber reinforced plastic lining is discussed, the properties of epoxy got from market are analyzed. Combined with the development of resin anticorrosion technology, the application of vinyl resin is discussed and a new type material, i.e. glass resin flake mortar, is recommended.
Carbon/carbon-silicon carbide(C/C-SiC) composite is a novel material developed in the new material field and has great prospect in brake fields due to excellent mechanical properties, especially outstanding friction-wear behavior.
As a new material, the researches on CaO-Al_2O_3-SiO_2 system glass-ceramics mainly focus on the crystalline process, heating treatment and properties of product.
These represent novel material for gene/ marker mapping, maize chromosome manipulation, the study of maize gene expression in oat, and the transfer of maize DNA, genes, or active transposons to oat.
This paper deals with the blending process and exceptional properties the special cable material of the polyurethane and their factors of effect. It clarifies that the new type of material is a ideal material which is used at the protective covering of the special cable and optical cable.
This paper deals with the blending process and exceptional properties of the cable material of the polyurethane and their factors of effect. It clarifies that the new type of material is a ideal material which is used at the protective covering of the special cable and optical cable.
A new spacicl wear resisting cast iron used for grindig bearing-ball was investigated. Through the orthogonal experiment, studies and analyseshave been made of the influences of Si/C, Cr%, Cu% and B% on structurs,sectional sensitivity, microhardlness of pearlite and carbide, as well as Brinell-hardness.Wear test shows that the wear resistance of the new material is 3~6 timeshigher than that of the old material.