Polishing powder based on CeO2 is synthesized by a neutral precipitation method under the action of an additive, with Ce2(CO3)3 as starting material and NH4HCO3 as the precipitant. The size distribution of CeO2 particles is narrow-ranged and their morphology show a shape of polyhedral globules. They have a satisfied dispersion in water. The optimum characteristics are obtained under the conditions of followings: the mass ratio of F (in H2SiF6 ) to CeO2 7%, the molar concentration of additive A4 0.85mol/L, calcined at 850°C for 2 hours.

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The employment of different carbon supports during the fabrication of electrocatalysts has a considerable impact on the properties of loaded metal particles and even the stability of catalysts. Here, we...

In this paper, the design of Jujube Plantlet Uprising Machine adopts plantlet uprising shovel fixed to the frame on the right side, using the three-point hitch of the tractor to adjust plantlet uprising depth, through a deep round dig depth stability limit, to take over operation, improve the efficiency of the plantlet uprising. Equipment is designed to provide technical support for a large number of high quality standardized jujube nursery, to laid the foundation calculation for large-scale jujube cultivation.