273results about How to "Structural damage is small" patented technology

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminum alloy composite material. The method comprises the following steps: pre-preparing micro-nano flake powder of an alloying component, subsequently ball-milling the powder with a carbon nanotube and spherical pure aluminum powder to prepare flake composite powder, and further performing densifying, sintering, thermal deformation processing and thermal treatment to achieve alloying so as to finally obtain the carbon nanotube reinforced aluminum alloy composite material. Uniform compounding of the matrix aluminum powder, the carbon nanotube and the alloying component can be achieved through limited ball-milling, and meanwhile dangerous elements or uneasy grinding elements such as magnesium and silicon which are high in activity and likely to combust and explode are avoided by adopting the stable and easily ground pre-alloying aluminum powder, so that the security and the reliability are improved; in addition, because of large interlayer boundary and small layer thickness distance, the flake structure is beneficial for uniformly dispersing the alloying component and forming refined dispersed separated phase. The method is beneficial for bringing the effects of composite reinforcement of carbon nanotubes and alloy reinforcement into play to the maximum extent, is energy-saving and time-saving, and is safe and feasible.

A preparation method of graphene oxide/ silicon dioxide hybrid aerogel comprises the following steps: A, adding 0.05-0.1 mol of a precursor into 9-18 ml of distilled water and dropwise adding a hydrolyst with its concentration of 0.2-0.6 mol/L into the precursor aqueous solution, wherein molar ratio of the hydrolyst to the precursor is 1:20-1:100; stirring at 20-30 DEG C for 5-8 h; adjusting pH value to 6-7 and stirring for 5-45 min so as to obtain a dispersion containing silicon dioxide microspheres; B, adding water to dilute the silicon dioxide microsphere dispersion by 5-50 times, carrying out iso-volume mixing on the diluted silicon dioxide microsphere dispersion and a graphene oxide dispersion with its concentration being 0.6-2 mg/ml, stirring for 10-30 min, carrying out ultrasonic treatment for 10-30 min so as to obtain graphene oxide/silicon dioxide hybrid aerogel; and C, freezing the hybrid aerogel under liquid nitrogen for 5-10 min, freeze-drying and dewatering to obtain the graphene oxide/silicon dioxide hybrid aerogel. The method is environmentally friendly, and the technology is simple. The prepared hybrid aerogel has advantages of complete gel network structure, high porosity, good adsorptivity, high strength, low density and the like.

The invention discloses a method for preparing a polyamide-amine in-situ intercalation graphene composite material. The method comprises the following steps of: (1) dispersing graphite in an imidazole-compound-containing organic solvent with ultrasonic, and centrifuging to obtain multi-layer graphene suspension; and (2) polymerizing to generate polyamide-amine in the multilayer graphene by adopting an in-situ polymerization method to prepare the polyamide-amine in-situ intercalation graphene composite material. According to the method, natural graphite is directly subjected to ultrasonic exfoliation in the organic solvent to obtain single-layer or multi-layer graphene suspension, the original sp2 structure of the graphene is slightly damaged because an oxidation step is not carried out, the polyamide-amine in-situ intercalation graphene composite material is prepared by using an in-situ polymerization method, so that graphene laminas are spread, interlamellar spacings are enlarged, the polyamide-amine on the surface of the graphene functionally prevents agglomeration of the graphene laminas, the graphene laminas are uniformly dispersed, and the product has good stability and is hardly precipitated.

The invention relates to a bamboo carbon fiber underwear fabric and a manufacture method thereof, belonging to the technical field of textiles. The bamboo carbon fiber underwear fabric consists of a lining layer and an external layer, and is characterized in that the lining layer consists of bamboo carbon fibers and cotton fibers according to the weight ratio of 15-30:70-85; the external layer consists of cotton fibers, Newdal fibers and polyurethane elastic fibers according to the weight ratio of 43-54:40-54:3-6. The manufacture method comprises that: the bamboo carbon fibers and the cotton fibers, the cotton fibers and the Newdal fibers are respectively spun into Sirospun blended yarns; the Sirospun blended yarns are interwoven with polyurethane elastic fibers to form a knitted underwear fabric; and the knitted underwear fabric forms a final finished product, namely the bamboo carbon fiber underwear fabric through dyeing, drying, sanding and shaping treatment. The fabric and the manufacture method have the advantages that the bamboo carbon fiber underwear fabric not only has good skin-friendly property, low pilling tendency and comfortable elasticity, and has functions of good odor decomposition, smell elimination and the like.

This invention relates to a sealing and stitching method for heat conducting pipes including: providing a die with a first and a second moulds and at least a surface of one is processed with die stamping to form multiple convexes and concaves, putting the open-end of a heat conduction pipe between the two moulds to apply pressure onto the open-end to close it simultaneously when passing through the concaves and convexes and let the extruded metal of the pipe extend to the multiple concaves and convexes to form an embossing closing part at the open-end, the embossing part is set on the special die and the sealing structure.

The invention provides a preparation method of a constant-hydrophilic graft-modified chlorinated polymer micro/nano fiber film, and relates to electric-spinning preparation and surface modification of the chlorinated polymer micro/nano fiber film. According to the method for preparing the chlorinated polymer micro/nano fiber film through electrospinning and surface graft polymerization hydrophilic modification, the problems that pressure drop is large, flux is small and the film is prone to contamination during a water system is treated through hydrophobic film material can be solved on the basis of less damages to the film structure. The method includes performing mild dehydrochlorination on chlorinated polymer resin during reflux under the condition of alkaline catalysis, preparing spinning solution, utilizing a self-made electrospinning device, adjusting spinning process parameters, obtaining the micro/nano fiber film with uniform fiber morphology and good mechanical property, then performing surface modification by the method of hydrophilic monomer surface grafting polymerization initiated by azodiisobutyronitrile, and obtaining the chlorinated polymer micro/nano fiber film with high hydrophilicity. The film can be applied to efficient frame-type filtering films.

The invention relates to preparation of an aluminium nitride and copper mixed nanometer lubricating grease additive and an application thereof, and belongs to the technical field of lubrication. The nanometer lubricating grease additive disclosed by the invention is prepared from nanometer AIN and nanometer Cu in a mixing manner, wherein the particle size ranges of the AIN powder and the Cu powder are 50-200nm. The obtained additive is added to base lubricating grease, so that not only can the anti-wear antifriction performance of the base lubricating grease be improved, but also the base lubricating grease can act on the surface of a friction pair, the roughness of the surface of the friction pair is improved, and a polishing scratch on the surface is repaired, so that the abrasion loss of the friction pair is reduced, the friction pair and the accuracy are effectively ensured, meanwhile, accumulation of heat on the friction surface is reduced, and the service life of the friction pair is prolonged. The test data show that compared with the lubricating grease to which the additive disclosed by the invention is not added, the friction coefficient of the lubricating grease to which the additive disclosed by the invention is added is reduced by 23.6-15.8%, and the friction durability is prolonged by 6-7 times.

The invention discloses a peeling method of a layered material and a high-quality peeling material obtained by peeling. The method comprises the following steps: 1) mixing the layered material and anintercalating agent to achieve infiltration of the layered material by the intercalating agent; 2) adding an activating agent to allow the activating agent reacted with the intercalating agent, so that the physical impact of a generated gas flow on the layered material causes the sheet layers of the layered material to peel, thereby resulting in a dispersion solution of a peeling material precursor; and 3) mixing the obtained dispersion solution of the peeling material precursor with a dispersion medium, and performing physical disintegration on the obtained dispersion system so as to obtain adispersion solution of the peeling material. According to the peeling method, the gas flow compact generated by the violent reaction of the intercalating agent and the activating agent which are intercalated on the sheet layer surfaces and at the interlaminations is used to overcome a force between the sheet layers to realize expansion peeling, so that the peeling material with less layer and high quality is obtained; and the process is simple, the production cycle is short, and high efficiency mass production of the peeling material can be realized.

The invention discloses a preparation method of low-molecular-weight sea cucumber fucosan sulfate. In the preparation method, a sea cucumber polysaccharide prepared by performing enzymolysis on pulverized sea cucumbers is used as a raw material. The preparation method comprises the following steps: 1) dissolving the sea cucumber polysaccharide in a sodium chloride solution, then adding ethanol, and centrifuging to remove the precipitate, thus obtaining the supernatant; and adding ethanol into the supernatant, centrifuging, dialyzing the obtained precipitate, and performing freeze-drying to obtain sea cucumber fucosan sulfate; 2) dissolving the sea cucumber fucosan sulfate in solvent, and performing ultrasonic treatment at 0-45 DEG C, wherein the treatment time is 10-180 minutes, and the ultrasonic sound field strength is 60-800 W/cm<2>; and 3) dialyzing the treated solution obtained in the step 2), and performing vacuum freeze-drying to obtain the low-molecular-weight sea cucumber fucosan sulfate. According to the invention, an ultrasonic degradation technology is adopted, high-molecular-weight sea cucumber fucosan sulfate can be quickly degraded, the reaction conditions are mild, and the preparation method is green and environment-friendly.

The invention discloses an evolutionary computation-based method for diagnosing compressor fault. The method comprises the following steps: data about the working condition of a compressor is collected and acquired; an observation point is taken as a node, and the correlation between observation points produced by the actual compressor physics; a weighting undirected graph G(V,A) is set up for measured data; the distance between fault data points is gauged by means of a relational graph instead of the traditional Euclidean distance method; the data about the fault of the compressor is converted into a problem with the partitioning of the weighting undirected graph G; the Pareto Principle structural map is adopted for partitioning cost function; an evolutionary calculation chart partitioning computation based on the improvement on the complexity system theory is designed to partitioning the relational graph; and the clustering/classification of the compressor fault data is realized through the optimal computation of the cost function, so that the purpose of fault diagnosis can be achieved.

The invention discloses a method for extracting peanut polysaccharide from cold pressed peanut cake. The method comprises the following steps of: (1) adding water into cold pressed peanut cake powder to obtain a peanut cake suspension; (2) adding a neutral protease into the peanut cake suspension to carry out an enzymatic hydrolysis reaction; (3) after the enzymatic hydrolysis reaction is ended, carrying out enzyme inactivation treatment on a reaction liquid obtained by the enzymatic hydrolysis reaction, and then, separating the reaction liquid to obtain protein-removed peanut cake residues; (4) extracting the peanut polysaccharide from the protein-removed peanut cake residues by using hot water to obtain a peanut cake polysaccharide extracting solution, wherein the hot water extraction temperature ranges from 50 DEG C to 90 DEG C; and (5) adding ethanol into the supernatant liquid of the peanut cake polysaccharide extracting solution to carry out sedimentation treatment to obtain a precipitate, i.e., the peanut polysaccharide. The peanut cake is subjected to enzymatic hydrolysis by using an efficient and nontoxic biological enzyme to remove proteins in the peanut cake effectively, so that the purity of the peanut polysaccharide is increased and is as high as 92.87%, and the extracting rate of the peanut polysaccharide is up to 27.04%.

The invention belongs to the technical field of graphene and provides a device for preparing the graphene by dry grinding and stripping. The device is characterized by comprising a driving unit, a disc rolling unit, a serial disc extruder, a cyclone disperser and a product collector, the disc rolling unit is provided with a grinding disc and a grinding roller, and the serial disc extruder is provided with a fixed disc and a moving disc which are combined dynamically and statically. The primary graphene is prepared by gradual shearing and striping with the disc rolling unit, and the graphene product is obtained by further shearing and stripping with the serial disc extruder. The graphene is prepared by continuous and stable stripping under the dry condition, production efficiency is high, and large-scale production of the graphene is easily realized.

The invention discloses a high-selectivity fuel adsorption and desulfurization agent of a bamboo source porous biomass carbon. The high-selectivity fuel adsorption and desulfurization agent is prepared through chemical activation and carbonization and concentrated nitric acid oxidation; and the high-selectivity fuel adsorption and desulfurization agent comprises the steps of carrying out wet impregnation on 20-40mesh bamboo powder by using chemical activator deionized water clear solutions of zinc chloride, phosphoric acid or potassium hydroxide at a room temperature for 12-24 h, putting a product into a vacuum oven of 40-80 DEG C for baking for 6-12 h, treating the product in a quartz glass tube in a tube furnace in a nitrogen atmosphere at 500-700 DEG C for 2-4 h, naturally cooling to a room temperature, washing and pickling by using deionized water, washing until filtrate is neutral and drying in the oven of 110 DEG C for 8-12 h to obtain the bamboo source porous biomass carbon; and treating the bamboo source porous biomass carbon by using 65% nitric acid at 80-120 DEG C for 3-8 h, washing to be neutral by using distilled water and drying in the oven of 110 DEG C for 8-12 h to prepare the material. The high-selectivity fuel adsorption and desulfurization agent is low in cost and small in structure damage after being oxidized by the nitric acid, and is suitable for being used as the high-selectivity fuel adsorption and desulfurization agent; and surface acidic groups are greatly improved.

The present invention provides a bone screw including a tubular body (1) with a bone thread (5) in at least a portion of its outer wall, the tubular body having an open first end (2) and an open second end (3); wherein at the open first end (2) a plurality of cutting teeth (4) is provided and wherein at the second end (3) a structure (31, 310) for engagement with a screwing-in tool (100) is provided. The invention also provides a tool used for being inserted into the bone screw, wherein the tool includes a structure (102, 103) for engagement that join with the structure (31, 310) for engagement of the bone screw to form a guide thread.

The invention relates to an identification method for a urine metabolism marker based on alzheimer disease. The identification method aims at solving the problem that a urine metabolism marker of existing alzheimer disease has not been clarified. The identification method for the urine metabolism marker based on alzheimer disease includes the specific steps that 1, alzheimer rat model is built and evaluated; 2, the intervention effect of Kaixin powder on building different-stage AD fat models is evaluated through the biomarker. The identification method is used for the field of metabolism marker identification.

The present invention discloses a wash-resisting polyamide fabric dyeing process comprising the following steps: a) base material dosing; b) cold heaping; c) heating; d) fiber treatment, to be more specific, 30 to 36 parts of a desizing refining agent, 13 to 18 parts of a fiber bulking agent, 15 to 20 parts of a dye leveling agent, 5 to 7 parts of a penetrating agent and 23 to 26 parts of glacial acetic acid are added into a dye vat, the PH value is adjusted, the PH value is maintained at 5.3 to 5.5, and the time is 2-5 hours; e) pretreatment; f) staining, to be more specific, baking soda is added, the PH value is adjusted to 9.5, dye tianlong yellow, tianlong blue and tianlong turquoise blue are added, water and the dyes are mixed into a dye liquid, and the weight ratio of dye tianlong yellow and cloth is 0.05: 1, the weight ratio of dye tianlong blue and cloth is 0.05: 1, and the weight ratio of dye tianlong turquoise blue and cloth is 0.5: 1; and g) color fixing, to be more specific, 5 to 9 parts of a color fixing agent and 3 to 7 parts of glacial acetic acid are added. Through the process, dyes are high in tendency in entering into the fabric, dye adhesion is large, the dyes are low in tendency to fall off by lighting and water washing, and damage to the internal structure of the fabric is small.

The invention relates to a friction type self-resetting cast-in-place beam column joint. The friction type self-resetting cast-in-place beam column joint comprises a weakened reinforced concrete beam, a reinforced concrete column and self-resetting friction type connecting pieces; and the weakened reinforced concrete beam and the reinforced concrete column are connected through cast-in-place, and the self-resetting friction type connecting pieces are additionally arranged in two weakened areas on the upper side and the lower side of the end of the weakened reinforced concrete beam. The friction type self-resetting cast-in-place beam column joint has the following beneficial effects that the damage mode of strong column and weak beam is realized by weakening the beam end, the damage is mainly concentrated on the replaceable self-resetting friction type connecting pieces at the beam end, and the internal force requirement of adjacent beam components is reduced; and energy consumption design, resetting design and replaceable design are integrated, the structural energy consumption can be increased through variable friction force, the structural damage can be reduced, self-resetting can be realized by utilizing the elasticity of a disc spring, residual deformation is reduced, periodic replacement of vulnerable components can be realized through full-bolt connection, and post-earthquake repair is facilitated.

The invention discloses a fluorine-carbon ratio control method for fluorinated carbon nanotubes. The method includes warming a mixture to perform reaction after uniformly mixing a fluorinated carbon nanotube and a polar solvent; and using the polar solvent to perform replacement on the fluorine in the carbon nanotube so as to make fluorine atoms detached from the carbon tube, or to weaken the acting force between fluorine and carbon so that defluoridation effects can be achieved. Through the selection of different polar solvents, hydrothermal temperatures and hydrothermal time, the method canwell control the defluorination amount of the carbon tube, and therefore, the fluorine-carbon ratio of the fluorinated carbon nanotube can be controlled; the method is simple in operation and high incontrollability; and compared with high temperature annealing treatments, the method can reduce damages to carbon tube structures and keep the excellent performance of the carbon tubes.

The invention provides a prefabricated segmental assembling pier in the form of component combination for the bottom segments. The prefabricated segmental assembling pier includes a bearing cap, a small-diameter pier column, hollow segmental pier bodies, a prestressed steel bars and a plurality of solid pier bodies. The bearing cap is fixed. The lower end of the small-diameter pier column is fixedwith the bearing cap, the hollow segmental pier bodies are arranged along the circumference of the small-diameter pier column and are fixed with the small diameter pier column. The solid pier bodiesat the lowest end are arranged on the small diameter pier column, and the hollow segment pier bodies, the upper solid pier body is arrange on the lower solid pier body, the prestressed steel bars respectively pass through the solid pier bodies, the hollow segment pier bodies and are fixed on the bearing cap or respectively pass through the solid pier bodies, and the small diameter pier column andare fixed on the bearing cap.