75results about How to "The process is simple and flexible" patented technology

The invention discloses a foam magnesium alloy preparing method, belonging to the field of the production of an alloy with open or closed pores. The method is particularly a method for preparing a magnesium alloy by means of foaming a powder entity and comprises the following steps: firstly, mixing 150-270-mesh pure magnesium powder and 250-400-mesh pure aluminum powder according to a mass ratio (pure magnesium powder : pure aluminum powder) ranging from 4:1 to 9:1 so as to obtain a metal powder mixture, uniformly mixing the metal powder mixture with 200-325-mesh TiH2 powder vesicant which accounts for 1.0-2.5 percent of the mass of the metal powder mixture, carrying out cold pressing and hot pressing on the mixture obtained from the previous step, and then obtaining a magnesium alloy foaming precast block; and then, under the protection of argon, preparing the foam magnesium alloy with an average aperture ranging from 1 mm to 5 mm by means of heating the foaming precast block in a mould. The method has the advantages of simple and flexible process, short period, high productive rate and no impurity; and the foam magnesium alloy prepared according to the method has a closed-pore structure and the advantages of high porosity, uniform pore structure distribution, regular pore shapes, wide application scope and good comprehensive performance.

Embodiments of the present invention provide a mobile station paging method and a mobile call center device, The method includes: receiving a service call request, and selecting a corresponding posterior probability table according to an identifier of a target mobile station included in the service call request, where the posterior probability table includes a distribution probability of the target mobile station in each cell of a location area where the target mobile station is located in a service state; and selecting a cell to page the target mobile station according to the distribution probability. The paging is performed based on the distribution probability of a user in the each cell in the service state; the paging process is simple; and the application scenario is wide, thereby saving air interface resources while ensuring a paging efficiency.

The invention provides a process method for separating and purifying rare earth elements by solvent extraction. The method takes a mixed rare earth sulfate solution obtained from a rare earth ore treated by sulphuric acid as a raw material, directly adopts a nonsaponifiable P507 extraction agent or a synergistic extraction agent containing the P507 to completely extract rare earth in a material liquid into an organic phase, and then takes the organic phase as a rare earth material liquid to extract, separate and purify the rare earth or directly backextract to produce mixed chlorinated rare earth or rare earth nitrate. The process method is simple and flexible, does not saponify the organic phase during the extraction and separation process, does not produce ammonia nitrogen waste water, is easy to backextract middle and heavy rare earths, and has less consumption of acid and base and low production cost.

The invention belongs to the technical field of material modification and particularly relates to a method for enhancing lipophilicity of a PP (polypropylene) fiber in two steps. Firstly, surface pretreatment is performed on the PP fiber with an acid solution, a lot of micropores are distributed in the surface of the fiber, the specific surface area is increased, the oil storage capability of the fiber is improved, then in combination with the chemical grafting copolymerization technology, one-component or multi-component alkyl (meth) acrylate is used as a monomer and matched with an initiator and a sweller, and grafting modification treatment is performed on the fiber; a lipophilic group is introduced onto the fiber, and the effect of enhancing adsorption separation is realized under the affinity effect of the lipophilic group and an organic liquid, and the lipophilic adsorption performance of the fiber is obviously improved. Meanwhile, the modified PP fiber is endowed with backwashing regeneration performance, and the method has the broad applicability.