8results about How to "Uneven distribution" patented technology

The utility model discloses a powder spraying device capable of uniformly spraying powder, which comprises a bearing plate, a supporting box body is fixedly arranged above the bearing plate through a bolt fastener, a control box body is stably and fixedly arranged at the top of the supporting box body, an oil-water separator is arranged on one side of the supporting box body, and a water outlet is formed in the other side of the supporting box body. A main air inlet seat is specially arranged on the rear side of the control box body, an air inlet pipe is connected to the upper portion of the main air inlet seat, a vulcanizing powder barrel device is further placed on the upper portion of the bearing plate, a powder suction rod stretches into the vulcanizing powder barrel device to suck powder, the powder is conveyed to a spray gun through a wheel cylinder body and a powder conveying pipe, it is guaranteed that the powder is conveyed stably and continuously, and a foundation is laid for uniform powder spraying. The fluidizer enables powder to uniformly enter a gun and avoid caking, the adjusting static knob on the box body is controlled to accurately adjust static parameters, the powder is uniformly attached to a workpiece, the atomization adjusting valve accurately adjusts atomization parameters, the powder is atomized well and diffused uniformly, uniform distribution in the whole powder spraying process is achieved, and the powder spraying quality is improved.

The application discloses a supported catalyst and a preparation method and application thereof, and the raw material of the supported catalyst comprises a ruthenium carbene complex, alkyl aluminum and / or alkyl aluminum oxide, a phosphine-based siloxane compound and a silicon-aluminum type mesoporous molecular sieve; wherein the silicon-aluminum type mesoporous molecular sieve has a silicon-aluminum molar ratio of 25-30, a specific surface area of 550-850 m 2 / g, a relative crystallinity of 90-95%, a pore size of 2.5-3.5 nm and a pore volume of 0.80-1.0 cm 3 / g. The active sites of the supported catalyst are fully exposed, the loading amount of the ruthenium carbene complex is high, the metal ruthenium is not easy to fall off, and the preparation process is simple, so that the supported catalyst can effectively initiate a 1-hexene metathesis reaction.

The invention belongs to the technical field of optical communication, and particularly discloses a preparation method of an ultra-low attenuation optical fiber and the ultra-low attenuation optical fiber, and the preparation method comprises the steps: S1, preparing a fluorine-doped sleeve with non-uniform fluorine distribution through employing an external vapor deposition technology; s2, stretching and corroding the fluorine-doped sleeve to obtain an inner cladding with a predetermined aperture; s3, SiO2 is deposited in the inner cladding layer by using an in-tube vapor deposition process, alkali metal doping is performed to form a core layer, the inner cladding layer with the core layer is melted and shrunk into a rod shape, and a rod-shaped structure is obtained; s4, preparing an outer cladding layer outside the rod-shaped structure through an external vapor deposition process, drying the rod-shaped structure with the outer cladding layer, and solidifying in a fluorine-containing atmosphere to obtain an optical fiber preform; and S5, drawing the optical fiber preform to form the optical fiber. According to the preparation method, external chemical vapor deposition and in-tube vapor deposition are utilized to achieve better optical fiber profile matching and viscosity matching.

This invention discloses a method for preparing a composite polyanionic sodium-ion battery cathode material, relating to the field of sodium-ion battery cathode material technology, including the following steps: S1, preparing in-situ doped ferrous sulfate; S2, preparing a graphene-based dispersion; S3, preparing a modified ferrous sulfate solution; S4, preparing an NFPP precursor; S5, preparing an NFPP cathode material. This invention uses stainless steel pickling waste liquid as raw material, first reducing it by adding elemental iron, then dispersing it in a graphene-based dispersion containing tannic acid to obtain carbon-coated modified ferrous sulfate; preparing the NFPP precursor by co-precipitation; and finally sintering to obtain a composite polyanionic sodium-ion battery cathode material with high compaction density and better electrochemical performance, thus improving the problems of poor conductivity, low compaction, low capacity, low rate capability, and high cost of existing NFPP cathode materials.

The utility model discloses a portable sedimentary bacteria plate support capable of timing, which relates to the technical field of experimental equipment and comprises a telescopic cylinder, a triangular support is arranged at the bottom end of the telescopic cylinder, a U-shaped frame is arranged at the top end of the telescopic cylinder, a fixing block is arranged inside the U-shaped frame, a frame body for placing a sedimentary bacteria plate is arranged above the fixing block, and the bottom end of the frame body is provided with a timer. A display screen used for displaying time is arranged in the frame body, in the equipment, moving airflow cannot cause uneven distribution of microorganism particles in air, and then the actual cleanliness of the clean room can be reflected more accurately.

This invention discloses a graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres and its preparation method. First, a reduced graphene oxide aerogel is prepared using graphene oxide as a raw material. Then, hollow Fe3O4 magnetic nanoparticles are prepared via a hydrothermal method using FeCl3·6H2O and ammonium acetate as raw materials. Finally, Fe3O4 / PPy / reduced graphene oxide aerogel is prepared by in-situ polymerization, and the graphene aerogel supported on Fe / N co-doped hollow carbon nanospheres is obtained through high-temperature heat treatment. The graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres of this invention exhibits excellent dielectric and magnetic losses. Simultaneously, the magnetic Fe nanoparticles in the material can effectively convert electromagnetic wave energy, achieving excellent microwave absorption performance, and showing great potential in next-generation cutting-edge advanced nanocomposite materials.

The utility model discloses a temperature control mechanism for chip detection equipment, which is arranged on an outer shell, a control structure is arranged on the outer shell, the inner part of the outer shell is divided into a plurality of cavities, the front ends of the plurality of cavities are sealed by door plates, the rear ends of the plurality of cavities are sealed by heat dissipation plates, and drawers are arranged in the cavities in a sliding manner; a plurality of diathermanous grooves are formed in the side direction of the drawer, the fixed-point temperature control structure comprises a penetrating structure arranged on the side face of the cavity, fixing structures corresponding to the diathermanous grooves are arranged on the penetrating structure, and when the drawer is in place, heat generated by the penetrating structure directly enters the diathermanous grooves, and the fixing structures are fixed to the diathermanous grooves. According to the utility model, the uniform temperature or humidity effect on the to-be-tested equipment can be ensured, so that the accuracy of test data is improved.

The invention provides a selenium monatomic coupling PtNiMoPdRh alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of metal nano catalysts. The preparation method comprises the following steps: performing constant-temperature heat treatment on carbon-selenium mixed powder at 680-700 DEG C to obtain a carbon-selenium compound, uniformly mixing a metal source, a surfactant, a reducing agent and the carbon-selenium compound in a solvent, and reacting at 200-240 DEG C to obtain the selenium monatomic coupled PtNiMoPdRh alloy catalyst. The selenium monatomic coupled PtNiMoPdRh alloy catalyst has the advantages of high conductivity, strong metal-carrier interaction, sufficient active sites, high structural stability, high catalytic activity and the like, and can be used for catalyzing water electrolysis for hydrogen production; in addition, the method is simple, easy to operate, short in reaction time and low in cost, and has good popularization and application prospects.