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The present application relates to a kind of composite soil conditioner and its preparation method, suitable for the rapid improvement of desertification, sandy soil.The conditioner is composed of potassium humate, ammonium humate, potassium fulvic acid, polyacrylamide, superabsorbent resin, Tween 20 and carrier filler and slow-release nutrient regulator, etc., which can improve soil water retention, promote the formation of granules, enhance the root absorption capacity, restore soil fertility and improve crop growth conditions.The preparation method includes carrier filler drying, mixing of each component, adding polyacrylamide and superabsorbent resin, low-speed stirring and sieving packaging.Field tests show that the conditioner is superior to traditional conditioner in improving soil water-holding capacity, water-stable aggregate content and crop yield per mu, and can significantly improve the structure of desertification soil and crop growth environment.

A preparation method of an MOFs modified wood-based self-supporting conductive skeleton comprises the following steps: step (1), cutting and stamping a wood block to obtain a thin wafer; carrying out chemical delignification treatment on the thin round sheets to obtain delignified wood sheets; (2) dissolving a metal salt and a surfactant in deionized water to obtain a metal salt solution; a wood chip metal salt solution is obtained; (3) dissolving an organic ligand and an end-capping reagent in deionized water to obtain a ligand solution, adding the ligand solution into the wood chip metal salt solution, stirring and aging to obtain the MOFs modified wood chip; (4) the MOFs modified wood chips are frozen and then dried, carbonization is conducted under the protection of a reducing gas atmosphere, and the MOFs modified wood-based carbon film is obtained; and (5), a DOL / DME mixed solution containing Li2S8 is dropwise added into the MOFs modified wood-based carbon film, and the MOFs modified wood-based self-supporting conductive framework is obtained. The energy density of the lithium-sulfur battery can be improved, the cycle life is prolonged, and the electrochemical reaction kinetic performance is enhanced.

The invention discloses a preparation method and use of an anti-aging product. The preparation method of the product is as follows: (1) preparing a ganoderma lucidum extract: taking a dried ganoderma lucidum fruiting body, crushing, leaching, adding water at 100±5°C according to a material-liquid mass ratio of 1:8-10, and repeatedly extracting at least three times, combining the extract, concentrating, and drying to obtain an extract; (2) preparing a versicolor extract: taking a dried versicolor fruiting body, crushing, leaching, adding water at 100±5°C and repeatedly extracting at least three times, combining the extract, concentrating, and drying to obtain an extract; (3) mixing 35-42 parts of β-nicotinamide mononucleotide, 13-16 parts of ganoderma lucidum extract, 18-21 parts of cordyceps sinensis or its extract, 6-10 parts of coenzyme Q10, 15-22 parts of versicolor extract, and 1.5-2.5 parts of yeast by weight. The preparation method provided by the invention is simple and easy to operate, easy to implement industrially, and the obtained product significantly reduces the cell aging rate, maintains telomerase activity, and has a good anti-aging effect.

The invention provides a grain gradient hard alloy holding-up hammer which comprises a base material and a toughened base material, the base material forms the upper part of the holding-up hammer, and the toughened base material forms the lower part of the holding-up hammer; tungsten carbide in the matrix material is first tungsten carbide, and the grain size of the first tungsten carbide is 0.8-1.2 [mu] m; tungsten carbide in the toughening matrix material is first tungsten carbide and second tungsten carbide, and the grain size of the second tungsten carbide is 2.0-3.2 microns. Medium coarse grain WC is added into a toughening matrix material adopted by the lower part of the hard alloy anvil with the gradient structure, so that the toughness of the lower part of the anvil is improved, the impact resistance of the anvil is improved, and the consumption of the anvil in a diamond synthesis process is effectively reduced. The invention further provides a preparation method and application of the grain gradient hard alloy holding-up hammer.

This invention discloses an automated clamping device for welding cylindrical components of concrete pump trucks, aiming to solve the problems of time-consuming and labor-intensive manual clamping, low positioning accuracy, and inability to achieve automated welding due to improper clamping in existing technologies. The device includes a tooling platform equipped with hydraulic cylinders and multiple telescopic cylinders. The output shafts of the hydraulic cylinders are connected to a tensioning and limiting mechanism. The telescopic shafts of the telescopic cylinders are connected to a rotary clamping mechanism for fixing the medium-sized cylindrical components. A rotary clamping mechanism is also provided around the periphery of the tooling platform. The tooling platform is connected to the slewing bearing of a positioner, which can rotate the tooling platform and the cylindrical components together to facilitate welding operations. Based on the structural characteristics of large-sized and medium-sized cylindrical components, this invention assembles two clamping systems onto a single tooling, employing fully hydraulic automatic clamping for accurate positioning, which is superior to manual tooling.