Excellent filtering ceramic media with controllable volume density was made in the experiment,α-Al2O3 and diatomite were used as the main materials,pore-forming agent and flux were added, water was used as the cementing agent and the plastic body was kneaded into ball by hands,after drying and firing.

Influence of bulk density and graphitization degree on hardness of C/C composites;

The results show that both magnesia and spinel are good additives to improve sintering of alumina,and bulk density of the sample can also be increased by properly extending sintering holding time.

The influence of hydroxyethyl methyl cellulose and vinyl co-polymer on the bulk density and capillary water absorption of hardened cement mortars was studied.

Aiming at the unsatisfactory apparent density of green anode,this thesis figured out the disfigurement of dry aggregate recipe in a certain company,and took some effective steps to gain a higher apparent density,thus improved the quality of pre-baked anode.

A test is done on pre-baked anode made from calcined coke in aspects of apparent density,real density,porosity,resistivity of powder,compressive strength,which shows compressed petroleum coke improves its chemical and physical performances.

The investigations were conducted experimentally on not only its petrogrphic structure but alsothe properties of its compressive strength, apparent porosity,apparent density and moisture content.

Estimation and application of volume density of discontinuities in sampling window;

Through adjusting the grain size gradation of fused silica mud,deducting the add of water when making mod via the special grind-promoted reagent,processing the mod by vacuum mixing and exhausting gas and optimizing the burning course,thus the volume density of developed fused silica product attained to above 1.

According to the formulation of (1-x)NBT-xBaTiO3, we select the different composition point, adopt different calcined temperature, and determine the best calcined temperature by measuring the samples' volume density and piezoelectric properties.

The renovated extruder has been successfully put into practical use, and the results show that the properties and quality of the electrodes produced by the renovated extruder have been greatly improved, including that the volume expansion of the green electrodes after extrusion is reduced, the density and strength of the products are increased, and the porosity of the pr.

At present study, excellent, proper pore size and controllable density lightweight ceramic filtration balls which can be applied to sewage disposal were made from diatomite in which pore-forming agent, flux .

Total amount of combustibles,volume density of combustible density, porosity of combustible bed,spatial arrangement of comstibles bed and slop had some effect on fire behavior in grassland .