12results about How to "Large aspect ratio" patented technology

The present invention relates to a high-entropy hydrotalcite-modified carbon fiber photothermal conversion material and a preparation method thereof. The technical scheme is: in a nitrogen or argon atmosphere, the waste fabric is heat-treated at a temperature of 300 to 700°C for 120 to 300 minutes to obtain a carbon fiber with a porous structure; then the metal salt is mixed in an equimolar ratio and stirred at 100 to 200°C for 10 to 25 minutes to obtain a mixed salt melt; then the carbon fiber with a porous structure is immersed in the mixed salt melt for 10 to 30 minutes, taken out, washed with water, and dried to obtain a high-entropy hydrotalcite-modified carbon fiber photothermal conversion material. The present invention has the characteristics of short production cycle, simple process, low cost, cheap and easy-to-obtain raw materials, and large-scale production. The prepared high-entropy hydrotalcite-modified carbon fiber photothermal conversion material has excellent photothermal conversion efficiency and high water evaporation rate.

The present application relates to a kind of biodegradable dark color mulch and its preparation method, and dark color mulch is made of cellulose, hemicellulose and degradable coating.The manufacturing method includes the preparation of dark color mulch substrate, coating layer coating.It specifically includes slurry compounding, beating, additive addition, is formed by papermaking, dehydration, pre-drying, coating, sizing, drying, calendering, product after drying.The local film has good wet strength, light resistance, weather resistance, heat preservation and entropy increasing effect.The results of farmland degradation experiment show that the mulch can be biodegraded after 50~60 days, and the biodegradation rate is more than 90%.

The invention discloses a four-corner snakelike bridge broadband electromagnetic band gap structure, and belongs to the technical field of circuit microwaves. According to the structure, complementary split-ring resonator shape etching is carried out at the center, and the snake-shaped bridge structures are arranged between the adjacent units, so that the inductance between the electromagnetic band gap units is increased, low-frequency-band SSN is effectively suppressed, the bandwidth is relatively wide, and SSN of a stop band can be effectively suppressed. The four sides of the EBG structure are etched into rectangles, and adjacent elements are connected to form a bridge. Compared with a traditional L-bridge structure, the S-shaped structure is designed, so that the surface current path can be increased, and the equivalent inductance and the equivalent capacitance are increased. The gap between the resonant rings generates a gap current and generates a resonant circuit, so that the cut-off frequency can be effectively reduced and the width of a stop band can be improved. The ultra-wide band gap structure takes the suppression depth of-30dB as a standard, can reach an ultra-wide band gap of 23.8 GHz, is obviously superior to a conventional electromagnetic band gap structure, and can better suppress the noise of a synchronous switch.

This invention discloses a gas diffusion layer with multi-level mass transfer channels, its preparation method, and its application. The gas diffusion layer with multi-level mass transfer channels includes a substrate layer and a microporous layer on the substrate layer; wherein the microporous layer comprises carbon black, hollow porous carbon nanofibers, and optionally a hydrophobic binder. This invention uses hollow porous carbon nanofibers as a novel MPL carbon material to synergistically construct a gas diffusion layer with better water vapor management capabilities in conjunction with carbon black particles. The resulting gas diffusion layer exhibits excellent comprehensive performance; its hollow porous structure provides additional water transport channels, improving water vapor transport capacity, thereby enabling the assembled membrane electrode to have better output performance.

The invention discloses a lithium battery diaphragm coated with aramid nanofibers and a preparation method of the lithium battery diaphragm, and belongs to the technical field of lithium ion battery materials, the aramid nanofibers with a unique nanoscale structure and excellent mechanical properties and thermal stability are used as a functional coating matrix, zirconium oxide with high hardness and high wear resistance is used as a functional filler, and the lithium battery diaphragm coated with the aramid nanofibers is prepared. A coating design is carried out through a plasma etching technology, and the functionalized lithium battery diaphragm with high safety, high mechanical strength and excellent thermal stability is prepared. The preparation method specifically comprises the following steps: carrying out plasma etching on a PP base membrane, preparing aramid nanofiber dispersion liquid, preparing ANF / ZrO2 / DMSO composite slurry, coating the PP base membrane, carrying out post-treatment and the like, so as to obtain the lithium battery diaphragm. According to the lithium battery diaphragm, the inherent defects of a traditional lithium battery diaphragm in the aspects of thermal safety, mechanical strength, electrolyte wettability and the like can be overcome. The preparation process is simple and controllable, and the obtained functional diaphragm has wide application prospects in the high-end fields of power lithium batteries, energy storage batteries and the like.

The utility model relates to a carrier sleeve, a carrier and coating equipment, the carrier sleeve comprises an insulating cylinder, the outer wall portion of the insulating cylinder is provided with a groove structure in the circumferential direction, the axial section of the groove structure comprises at least two groove sections, and the groove sections are arranged side by side in the radial direction of the insulating cylinder and are sequentially communicated end to end. Through the arrangement of the groove structure, the probability that a continuous polycrystalline silicon layer is formed on the surface of the sleeve along a creepage path can be effectively reduced, the situation of short circuit between two adjacent boat pieces is further reduced, the service life of the sleeve and the boat pieces is prolonged, and the product yield of the substrate is improved.

The present invention belongs to the technical field of special materials for PE pipes, and specifically relates to an ultra-large-caliber PE pipe material and its preparation method and application. The present invention first provides a modified whisker carbon nanotube masterbatch, wherein the whisker carbon nanotube is grafted with a phase change microsphere having a phenolic resin as a shell and n-hexadecane as a phase change core material, and the masterbatch is mixed with PE resin and kneaded to form a masterbatch, and then further made into an ultra-large-caliber PE pipe material with PE resin and carbon black masterbatch. The obtained ultra-large-caliber PE pipe material has good tensile fracture rate and anti-aging performance, and other properties also meet the relevant standard requirements of PE pipes.

The present invention discloses a laser radar scanning method and a computer-readable storage medium. The method comprises: a first light deflection device deflects a light beam emitted by a light source by a plurality of first deflection angles along a first direction; the length of the light beam emitted by the light source along the first direction is less than the length along a second direction; a second light deflection device deflects the light beam deflected by the first light deflection device by a plurality of second deflection angles along a first direction and a second direction to project a scanning light beam; the length of the scanning light beam in the first direction is less than its length in the second direction; the second deflection angle of the incident light beam deflected by the second light deflection device is adjusted by controlling the working voltage applied to the second light deflection device, and the corresponding working voltage applied is fine-tuned according to the incident angle of the light beam incident on the second light deflection device; wherein, for the same second deflection angle, different incident angles correspond to different working voltages.

This invention provides a multi-turn silver nanoring and its preparation method, belonging to the field of metal nanomaterial preparation technology. The invention first mixes a polyvinylpyrrolidone (PVP) glycol solution with pyridine to obtain a mixed solution; then, the mixed solution, a sodium halide glycol solution, silver nitrate, and sodium nitrate are mixed, followed by a solvothermal reaction and precipitation separation to obtain multi-turn silver nanorings. The method for preparing multi-turn silver nanorings is simple, easy to implement, has good reproducibility, and high yield. During the preparation process, the addition of the organic solvent pyridine enables the silver nanowires to bend and grow significantly to form multi-turn silver nanorings.

This invention discloses a two-way combined group-mode precision compression process, including the following steps: Step (1): Explosive preparation, optimizing the explosive formula, improving the physicochemical properties of the explosive particles, utilizing reasonable particle gradation and explosive crystal spheroidization technology to reduce the porosity between explosive particles, and secondly, using highly dense spheroidized black oxojin and octogen high-energy explosive particles with smooth surfaces and shapes as close to circles as possible to reduce crystal defects and improve crystal density and compressibility. The process of this invention achieves precise clustering and two-way compression of multiple explosive columns on a conventional upward-moving unidirectional press, which is economical, widely applicable, and highly efficient. The prepared explosive columns have the advantages of large aspect ratio (≥2), high density and uniform distribution (density difference ≤0.5%), high energy, and good quality.

This invention relates to the field of polymer materials and discloses a modified polypropylene material and its application in HPPM double-wall corrugated pipes. The modified polypropylene material comprises: polypropylene resin, modified graphitic carbon nitride, modified multi-walled carbon nanotubes, and additives. The modified graphitic carbon nitride is prepared by grafting a hindered amine-type bromine-substituted intermediate with amino-modified graphitic carbon nitride. The hindered amine-type bromine-substituted intermediate is prepared by reacting ethyl 2-amino-4-methylthiazolium-5-carboxylate with 1,4-dibromobutane and then undergoing transesterification with 2,2,6,6-tetramethyl-4-piperidinol. The modified multi-walled carbon nanotubes are prepared by grafting acyl chloride multi-walled carbon nanotubes with a cyclotriphosphazene derivative. The cyclotriphosphazene derivative is prepared by reacting 4-imidazolium formaldehyde with p-phenylenediamine, then undergoing substitution with hexachlorocyclotriphosphazene and further addition with DOPO. The modified polypropylene material prepared by this invention possesses good mechanical properties, UV aging resistance, flame retardancy, and antibacterial properties.

The present invention relates to a nanofiber cluster-shaped bismuth vanadate gas-sensitive material and a preparation method thereof, which is composed of a nanofiber stacked fiber cluster and independently dispersed nanofibers, wherein the diameter of the independently dispersed nanofibers is 5 to 50 nm, the diameter of the nanofiber stacked fiber cluster is 10 to 500 nm, and the nanofibers contain fiber gap micropores less than 2 nm, and the nanofiber stacked fiber clusters and the independently dispersed nanofibers overlap each other to form macropores of 50 to 150 nm. Preparation method: prepare a dilute nitric acid solution; dissolve bismuth nitrate pentahydrate and ammonium metavanadate in the dilute nitric acid solution respectively; add the ammonium metavanadate mixed solution dropwise to the bismuth nitrate mixed solution; add ammonia water; solvent thermal reaction; centrifuge; pour in anhydrous ethanol and rotate and shake; centrifuge and wash. This patented method does not require roasting, has low energy consumption, and is simple in process. The material of the present invention has high sensitivity to ethylene glycol gas, short response recovery time, and low operating temperature.