And to fulfill the high-load production after capacity expansion,it was necessary to properly increase the bulk density of the bed,ensure the residence time of the catalyst in the reactor,reduce the frequency of discharging and decrease unit consumption,so increasing the bulk density of the bed and stabilizing catal.

Effect of rod milling technique on apparent density of atomized iron powder;

Optimization of particle size distribution for improving apparent density of iron powders used for warm compaction;

Influence of pH value and surfactant on apparent density of nano-scale nickel hydroxide;

The effect of inoculating crystal and additive on particle size and bulk density of CeO2 was studied.

Commercial BeO applicable for Be and Cu master alloy production is produced by control of operation and technical conditions of precipitation,alkali washing,and calcination and also by testing of technical data such as specific surface area,bulk density,and ignition loss,etc.

The preparation of cerium carbonate product by cerium chloride and ammonium bicarbonate coprecipitation is studied,high bulk density cerium oxide has been obtained through cerium carbonate high temperature roasting.

Effect of loose dry density on process of quality control of lime-soil;

pitysophila damage to the pine forest could be controlled through adjusting the pine forest density;meanwhile,this paper found that the population density of the pine forest on the endroit was bigger than th.

To maintain a good spread of solution in the population, the Loosing- density is defined and used in this algorithm,the fitness of the individual through Pareto strength and Loosing- density is also defined .