Purpose: To evaluate the value of the postprocessing techniques of spiral CT images in the diagnosis of non-metal foreign bodies of trachea and bronchus in children.

Objective To summarize the diagnosis and treatment methods of metallic foreign body in oral and maxillofacial deep regions.

The distributions and characteristics of non-metallic micro-inclusions of GCr15 and SS400 casting slabs in process of BOF-LF-VD-CC were analyzed by metallographic volume ratio method,in virtue of tracer method and electronic microscope.

Study on absorbability of sulfured hydrogen in several nonmetallic minerals;

As clay nonmetallic minerals possess good adsorption and ion-exchange properties,a large amount of work has been done to substitute expensive commercial active carbon with these low cost and locally available materials in water treatment.

The four kinds of nonmetallic minerals, diatomite, white clay, perlite and zeotite, which primary components being oxide of Si and Al, are of the characteristics are porous, little rigidity, bigger BET, better sparkle characteristic and so on.