7results about How to "Simple technical solution" patented technology

The invention provides a method for preparing ammonium phosphomolybdate from a sulfuric acid system phosphorus-containing molybdenum-vanadium mixed solution, and relates to the technical field of ammonium phosphomolybdate production. S2, adjusting pH and supplementing an ammonium source; step S3, precipitating ammonium phosphomolybdate; and S4, recovering and reusing the molybdenum and vanadium-containing solution resin. The process flow is short, the whole process is simple and easy to industrialize, three wastes are basically avoided, and the method is an efficient, green, environment-friendly and low-carbon process route.

The application relates to a preparation method of an entropy-based oxide catalyst with high metallic property and application of the entropy-based oxide catalyst in hydrogen production by acidic electrolytic water, and belongs to the field of catalysis. A water-soluble salt containing at least Ru, Ir and A is uniformly mixed, hydrolyzed and reduced under water bath stirring condition by taking zinc oxide as a carrier and a sodium borohydride solution as a reducing agent, then the black powder of the medium-entropy alloy is formed through filtration, washing and drying, and finally the black powder is subjected to rapid incomplete oxidation under the condition of 300-500 DEG C and air atmosphere, and then is subjected to acid pickling, filtration, washing and drying to prepare the entropy-based oxide catalyst with high metallic property. The catalyst contains a large amount of Ir-Ir metal bonds and / or Ir-Ru metal bonds, and the proportion can reach 30%-40%. The mismatch between the metal atom fingerprint structure and the metal-oxygen atom coordination structure causes serious lattice distortion, induces unbalanced distribution of stress and strain, and promotes the kinetics of the acidic oxygen evolution reaction.

The invention provides a seawater-corrosion-resistant cement adhesive for an extra-high voltage porcelain insulator and a preparation method of the seawater-corrosion-resistant cement adhesive. The cement adhesive comprises the following components in percentage by weight: 40-60wt% of aluminoferrite cement, 30-50wt% of artificial porcelain sand, 3-5wt% of a cement expanding agent, 0.5-5wt% of silica powder and 0.5-5wt% of silicon carbide whiskers, the sum of the components is 100%, and the cement adhesive further comprises an externally doped anti-cracking agent, a water reducing agent and a defoaming agent, the external mixing amounts of the anti-cracking agent, the water reducing agent and the defoaming agent are respectively 0.1 to 0.3 weight percent, 0.1 to 0.3 weight percent and 0.1 to 0.5 weight percent. The cement adhesive is reasonable in material selection, high in early strength and continuously increased in later strength, the prepared porcelain insulator has excellent seawater erosion resistance, and the cement adhesive has a good application prospect when being applied to the porcelain insulator with high requirements on seawater erosion resistance and seawater erosion resistance.

The portable pipeline positioning device and pipeline positioning method of the present invention, wherein the positioning device includes a main body and a circular arc steel pipe, the upper end surface of the main body is provided with a marking point and a compass, and the front end surface of the main body is provided with a bubble level. The pipeline positioning method of the present invention comprises: rotating the selected circular arc steel pipe and fitting it with the pipeline, moving the main body along the circumferential direction of the pipeline, so that the bubble of the bubble level is located directly below the marking point, and the position of the main body on the pipeline is the reference 0 point of the pipeline at this time; measuring the reference 0 point of the vertical pipeline, fitting the main body of the device with the drum front barrel, recording the direction indicated by the compass, and then rotating the selected circular arc steel pipe and fitting it with the pipeline to be inspected, moving the main body along the circumferential direction of the pipeline, so that the compass indicates the previously recorded position, and setting this position as the reference 0 point of the pipeline. The technical solution of the present invention is simple, and can quickly and accurately confirm the reference 0 point of the horizontally arranged and vertically arranged pipelines.

A three-axle bogie for a track engineering tractor is provided, wherein the frame is composed of two side beams, two middle beams and end beams, and multiple groups of spring slider type support devices for supporting the vehicle body are symmetrically arranged on the two side beams, and the spring slider type support device and the side block and traction rod device arranged at the bottom of the side beam form a suspension elastic support structure for the vehicle body; the axle gearboxes on the axles in the two adjacent wheel set assemblies are connected through a transmission shaft to realize the synchronous rotation of the three axle gearboxes driven by the power drive system. The present invention improves the support structure for supporting the vehicle body, and has the characteristics of high power, large adhesion weight, and large traction capacity while ensuring the low cost and safety performance of the engineering tractor. The spring slider type support device is simply and effectively combined with the side block and traction rod device, so that the tractor has good running stability and is easy to manufacture, and can be used for a liquid-transmitted rail vehicle tractor or a traction electric body suspended electric rail vehicle.

The invention provides a large-length-diameter-ratio main road type sintered wick high-temperature heat pipe and a preparation method thereof, and belongs to the technical field of high-temperature heat pipes. The high-temperature heat pipe comprises a pipe shell, an end cover, a porous wick, a wire mesh trunk and a liquid metal working medium, and the porous wick, the tube shell and the wire mesh trunk are integrally sintered and molded. According to the high-temperature heat pipe, the porous wick, the pipe shell and the silk screen main road are integrally sintered and formed, the contact thermal resistance can be reduced, the porous wick has high capillary force and large heat exchange area, the silk screen main road has high permeability, the heat transfer efficiency of the high-temperature heat pipe can be remarkably improved, and the heat transfer distance of the high-temperature heat pipe can be remarkably increased. When the preparation method is adopted to prepare the large-length-diameter-ratio trunk line type sintered wick high-temperature heat pipe, the middle core rod is easy to draft, impurities such as a release agent which pollutes the wick are not introduced, the problem that the high-temperature heat pipe is difficult to draft is solved, and the preparation method can be used for standardized and batch production of the large-length-diameter-ratio trunk line type wick high-temperature heat pipe.

The invention discloses a preparation method of a resveratrol-pectin compound with high stability and bioaccessibility, which comprises the following steps: step 1, dissolving high-ester pectin in water, adjusting the pH value to 11, reacting at 25 DEG C for 20-30 minutes, maintaining the pH value constant in the reaction process, adjusting the pH value to 2 after degreasing, adding absolute ethyl alcohol to generate precipitate, filtering, washing and drying to obtain a resveratrol-pectin solution; the esterification degree of the low-ester pectin is lower than 30%; 2, respectively dissolving the low-methoxyl pectin and resveratrol in a solvent, and stirring the low-methoxyl pectin solution and the resveratrol solution for 20-40 minutes at the temperature of 30 DEG C according to the volume ratio of 2: 1 to obtain a resveratrol-pectin mixed solution; and step 3, separating and purifying the resveratrol-pectin mixed solution by using a ceramic composite membrane, and freeze-drying to obtain the resveratrol-pectin compound. According to the invention, the stability and bio-accessibility of resveratrol can be effectively improved.