34results about How to "Effective control of uniformity" patented technology

The invention provides a fluorescent layer structure comprising a first fluorescent layer and a second fluorescent layer which are stacked, wherein the first fluorescent layer comprises a plurality of first phosphor powder strips which are spaced from one another, the second fluorescent layer comprises a plurality of second phosphor powder strips which are spaced from one another, and the maximum distance between two adjacent first phosphor powder strips and the maximum distance between two adjacent second phosphor powder strips are both less than 1 mm. Compared with the prior art, in the fluorescent layer structure provided by the invention, the phosphor powder strips are spaced to achieve the purpose of controlling the uniformity of phosphor powders in the fluorescent layer structure, so as to ensure more uniform mixing of light from a light emitting diode and better light output efficiency. The invention also provides a forming method of the fluorescent layer structure and a light emitting diode package structure having the fluorescent layer structure.

Provided is a sectionalized hole sealing method for bedding gas extraction drilled holes. After gas extraction drilling construction is completed, sponge wraps the front ends of hole sealing tubes with the lengths not less than 20m in a winding mode and then polyurethane materials coat the sponge, elastic partition plates are arranged on the tube sections of each hole sealing tube in a sectionalized mode, then, the hole sealing tubes are sent into gas extraction drilled holes, quick-drying cement plugs are adopted to seal the hole openings of the gas extraction drilled holes, and the grouted cement materials are injected in hole sealing spaces through grouting tubes. Under the action of grouting pressure, each section of relatively independent hole sealing space is filled with the grouted cement materials, and the grouted cement materials enter gaps of media around the drilled holes to the maximum extent so that the drilled holes can be sealed. Due to the fact that the method is characterized in that each sealed hole is long and the partition plates are used for dividing grouted sections into a plurality of hole sealing spaces, sedimentation and uneven solidification of the grouted cement materials in the hole sealing spaces can be effectively controlled, sealing of the gaps of the media around the drilled holes is facilitated, the hole sealing effect is good, concentration of gas extracted after the hole drilling can be kept in a high level for a long time, and the coal bed gas extraction effect can be obviously improved.

The invention relates to the technical field of functional materials, in particular to a method for synthesizing a soft-hard exchange coupling magnet by a chemical co-precipitation molten salt method; comprising the following steps: according to xCoFe 2 o 4 CoFe in / yBaM 2 o 4 According to the stoichiometric ratio of the BaM component, the raw materials were weighed to prepare a mixed metal salt solution; to prepare a precipitant, the mixed metal salt solution was added to the precipitant, stirred and reacted for a period of time, and separated by suction filtration to obtain a filter cake; the filter cake was baked Dry to constant weight, crush and grind to obtain precursor powder, mix with salt, and ball mill to obtain mixed product; heat treat the mixed product, filter the product after cleaning, and dry the filtered product to obtain ferrite powder; The invention combines the uniform mixing of chemical co-precipitation metal ions and the crystal growth control of molten salt heat treatment, and realizes the two-component compounding of soft-hard exchange coupling magnets through technical means such as component adjustment, optimization of composite precipitant, and molten salt heat treatment instead of traditional heat treatment. Precise synthesis of ferrite and control of particle structure.

The invention relates to a method for manufacturing a coaxial silicon carbide / silicon dioxide nanocable with a chemical vapor deposition method. The method comprises the following steps of: putting a soaked carbon / carbon compound material into a deposition furnace; vacuumizing and introducing argon till the normal pressure is reached; introducing hydrogen gas serving as carrier gas into a bubbling bottle loaded with methyl trichlorosilane; introducing methyl trichlorosilane serving as a reaction gas resource into a hearth; and meanwhile, introducing diluted argon and diluted hydrogen for reacting. The method has a simple synthesizing process, and a pre-synthesizing process is not required; the silicon carbide / silicon dioxide (inner core / outer layer) coaxial nanocable is manufactured under the normal pressure, and the requirement on equipment is low; the deposition temperature is low, and the manufacturing cost is lowered; and moreover, the method has another outstanding characteristic that the purity and uniformity of the silicon carbide / silicon dioxide (inner core / outer layer) coaxial nanocable can be effectively controlled by adjusting deposition process parameters. According to the advantages, large-scale industrial production of the silicon carbide / silicon dioxide (inner core / outer layer) coaxial nanocable becomes possible.

The invention discloses a multi-point pressurization device for controlling the density and uniformity of fabric layers stitched on complex curved surfaces, which includes a male mold, a female mold and a multi-point pressurization tooling assembly; the multi-point pressurization assembly includes: an arched bracket and a pressurization Components; the arched bracket is erected on the periphery of the female mold; the pressurized assembly includes a screw, a rotating handle and a rubber pad, the screw is threaded on the arched bracket, and one end of the screw extends through the arched bracket to the outer surface of the female mold, and the other end stay outside the arched support; the rotary handle is connected to the end of the screw rod left outside the arched support; The multi-point pressurizing device for controlling the layer density and uniformity of complex curved surface stitched fabrics in the present invention is simple in structure, easy to process, easy to assemble, convenient to use, and can effectively control the layer density and uniformity of complex curved surface three-dimensional fabrics, thereby improving complex curved surface stitching The quality of the fabric.