128results about How to "Meet mechanical strength requirements" patented technology

The invention discloses an acellular matrix with natural level of glycosaminoglycan and preparation and application thereof. The preparation method comprises the following steps: carrying out acellular disposal on natural biological tissue to obtain an acellular matrix; detecting missing amount of glycosaminoglycan in the acellular matrix; and supplementing glycosaminoglycan by means of natural ingredients in the acellular matrix to obtain the acellular matrix with natural level of glycosaminoglycan. Through the method, a lot of the glycosaminoglycan component in the acellular matrix is recovered. The acellular matrix has good biocompatibility. The natural biological structure is recovered, and the acellular matrix is beneficial to cell growth. glycosaminoglycan is supplemented for the acellular matrix, and a tissue engineering carrier is constructed. According to the invention, a biological carrier which meets cell growth requirement and mechanical strength requirement and has similar structural components as a natural extracellular matrix can be prepared rapidly. The invention is a great breakthrough of the tissue engineering construction technology. Meanwhile, principle of the invention is reliable, the technology is simple and flexible, product reproducibility is good, and industrialization is easy to realize.

The invention discloses a controlled-release carbon source material for repairing polluted underground water organisms and a preparation method thereof and belongs to the field of underground water repairing. The controlled-release carbon source material comprises a core and a shell wrapping the core, wherein the core comprises the following components in percentage by weight: 40 to 86 percent ofcarbon releasing raw material, 1 to 25 percent of nutritional raw material, 5 to 45 percent of plastic bonding raw material, 5 to 20 percent of high-permeability raw material and the balance of water; the shell comprises the following components in percentage by weight: 10 to 40 percent of carbon releasing raw material, 1 to 10 percent of nutritional raw material, 20 to 80 percent of plastic bonding raw material, 0 to 40 percent of high-permeability raw material and the balance of water; and the controlled-release carbon source material is prepared by a compound formula consisting of the carbon releasing raw materials, nutritional elements and multi-component inorganic combined raw materials. The controlled-release carbon source material meets a microbial nutrition demand and requirementsfor long-time stable material supply during underground water repairing, certain mechanism strength and uniform sphericity; furthermore, the defects of high carbon loss, uncontrollable releasing rateand the like in the conventional carbon source compensation method are overcome; and the continuity of the underground water organism repairing effect is realized.

The invention provides a concrete delivery tube, which has at least two bent parts and comprises an inner tube and an outer tube compounded outside the inner tube, wherein the outer tube at least consists of an outer tube first part and an outer tube second part; the shapes of cross sections of the outer tube first part and the outer tube second tube are circular arcs; the outer tube is formed by connecting the outer tube first part and the outer tube second part; and the wear resistance of the inner tube is higher than that of the outer tube, and the roughness of the outer tube is higher than that of the inner tube. Compared with the prior art, a high-priced surfacing welding process is not required to improve the wear resistance of the inner surface of the delivery tube, and with the composite tube having the inner tube with high wear resistance and the outer tube which is compounded outside the inner tube and has high roughness, the concrete delivery tube meet the requirements on wear resistance and mechanical strength.

The invention discloses a calcium phosphate-based bone repair scaffold and a preparation method thereof. Calcium phosphate bone cement is used as a raw material and is combined with a 3D printing technology to obtain a calcium phosphate bone cement scaffold with through macropores; a dopamine solution is used for modifying the surface of the scaffold; dopamine forms a polydopamine layer on the surface of the scaffold through self-oxidation under alkaline conditions; polydopamine has good viscosity and biocompatibility, can be used as an adhering coating layer of BMP-2, improves the content offixed BMP-2, and promotes cell adhesion and proliferation; the BMP-2 loaded on the scaffold can also effectively promote the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells. The prepared calcium phosphate-based bone repair scaffold has through macropores, meets the mechanical strength requirements of cancellous bones, has excellent biocompatibility, can effectively promote bone tissue regeneration, and has potential application value in the field of bone tissue repair.

The invention relates to an artificial quartz stone and a preparation method thereof. The quartz stone is composed of the main raw materials of, by mass: 3-10% of aqueous resin, a curing agent with a mass accounting for 5-200% of that of the aqueous resin, 55-65% of quartz sand, glass sand and mirror glass sand, 25-35% of quartz powder, a coupling agent with a mass accounting for 0.05-0.2% of the total mass of quartz sand, glass san, mirror glass sand, and quartz powder, and 1% of a color paste. The preparation method comprises the steps that: the raw materials are fetched according to mass percentages; the curing agent, the coupling agent, and the color paste are added into aqueous resin, and the mixture is uniformly dispersed; the mixture is mixed with already uniformly mixed quartz sand, glass sand and mirror glass sand; the mixture is well mixed; quartz powder is added; the mixture is well mixed by stirring, such that a half-dry material is obtained; the material is distributed by using a mold; and vacuuming, molding, curing, thickness setting, and polishing are carried out, such that a finished product is obtained. According to the invention, aqueous resin and a water solvent are used for replacing oleiferous resin and an organic solvent, such that the harm to the environment caused by evaporation of the organic solvent is solved, viscosity is reduced, and manufacturability is improved.

The invention discloses a lining pipe joint of a marine oil pipeline to solve the problem of low mechanical strength of the conventional lining pipe joint. The lining pipe joint comprises a flange (1), an inner sleeve (2), an outer sleeve (3) and a plurality of jackscrews (4), wherein the inner sleeve (2) is arranged in the outer sleeve (3) and is coaxial with the outer sleeve (3); the flange (1) is fixed with one end of the inner sleeve (2) and one end of the outer sleeve (3) and is coaxial with the inner sleeve (2) and the outer sleeve (3); the outer surface of the inner sleeve (2) is provided with an annular groove (2-1); a plurality of threaded holes are uniformly formed in the outer sleeve (3) along the circumferential direction; and each jackscrew (4) is screwed in a threaded hole, and the front end of each jackscrew (4) extends into the inner surface of the outer sleeve (3) and jacks the groove (2-1) on the outer surface of the inner sleeve (2). The lining pipe joint can be applied to connection of hoses with various diameters.

The invention relates to a high-voltage bushing and a processing technology thereof. A capacitor electrode of the high-voltage bushing adopts one or more of conductive fabric, a conductive net and conductive yarn. The processing technology of the high-voltage bushing comprises steps as follows: an insulating layer is prepared in a winding manner firstly, and a capacitor electrode layer is prepared in a winding manner; the steps are repeated alternately until a core is formed; finally, vacuum impregnation is performed, and the high-voltage bushing is formed. According to the high-voltage bushing and the processing technology thereof, the conductive fabric, the conductive net or the conductive yarn is adopted as the capacitor electrode, and epoxy resin or insulating oil can smoothly run through the capacitor electrode and is fused with the insulating layer; the dielectric loss of the high-voltage bushing is reduced from 5 permillage to 3 permillage, the magnitude of partial discharge is reduced from the value lower than 10 pC to the value lower than5 pC, the insulating property is improved by higher than 10%, and the qualified rate of production is increased to be higher than 90% from 40%.

The invention discloses a hybrid current collector used for lead storage batteries, which is characterized in that the hybrid current collector comprises at least one conducting framework and a shaping framework, the conducting framework is molded in a hybrid form, the shaping framework is manufactured by lightweight hard materials, and the hybrid current collector is a grid plate with hollow grids or a plate-shaped current collector without grids. The hybrid process of the conducting framework and the shaping framework includes injection molding and joggle fixing molding, wherein the injection molding utilizes thermal plastic and cold extrusion or uses cement concrete, the joggle fixing comprises steps of utilizing the lightweight hard material to manufacture a substrate module which is used as the shaping framework and then joggling and fixing the shaping framework with the conducting framework which is designed as a coupling module. The conducting framework of the current collector can extend to form an integrated lead electrode or is electrically fixedly connected with a split lead electrode. The polar plate manufactured by utilizing the current collector is light in weight, high in specific energy, simple in manufacture and low in material cost.

The invention discloses a sensor mounting base with a cooling function. The sensor mounting base is formed by coaxially assembling a platform, a cylindrical boss and a sealing ring in an integrated manner. The cylindrical boss is hollow, and is provided with at least two vertical air ducts in the wall surface. The sealing ring is connected to the bottom of the cylindrical boss, and forms a horizontal annular groove communicating all the air ducts. The platform is provided with horizontal air outlet holes and air inlet holes externally connected with aviation cold air. The air inlet holes, the air outlet holes and the air ducts are gradually communicated in a crossed manner, and form an air flow channel space inside the sensor mounting base together with the horizontal annular groove. By adopting the technical scheme of the invention, through cooling structure improvement and cooling treatment, the mounting base, even made by common nickel-based alloy, can meet the mechanical strength requirement of application in an about-1600K high-temperature gas environment. The surface temperature can be effectively reduced, measurement precision out-of-tolerance caused by temperature overrun of a compensation wire part of a thermocouple is reduced, and the weight load on and the cost of aero engines are reduced.

The invention discloses a preparation method of a chitosan/hydroxyapatite magnetic bone repair support material, and belongs to the field of chemical and biological engineering materials. The method specifically comprises the steps that chitosan/hydroxyapatite nano-composite powder is prepared; magnetic nano-powder, the chitosan/hydroxyapatite nano-composite powder and pore forming substance particles are evenly mixed; then binder silica sol and water are added to be fully mixed to obtain needed slurry; and extrusion forming, drying, demolding, pore forming substance removal and sintering are carried out on the slurry to obtain a composite support. The method is simple and convenient to operate, and the porosity of the obtained support is high. Mechanical performance is good and is equivalent to cancellous bone performance. The cancellous bone repair need can be met, certain magnetism is achieved, and the proliferation and differentiation of osteoblast can be stimulated. Hydroxyapatite in the composite powder is distributed in a chitosan matrix in a needle shape with nanometer as the scale, biocompatibility can be improved, the toxic reaction of cells can be reduced, and the good application prospect is achieved.

The invention relates to a powder coating for edge sealing of a heat-sensitive base material and an edge-sealing coating and a preparation method thereof. The powder coating is prepared from the following raw materials in parts by weight: 25-70 parts of unsaturated polyester resin or super-esterified polyester resin, 1-20 parts of ultraviolet spectrum initiator in the wavelength range of 0.01-0.04mu m, 1-20 parts of thermal initiator in the thermal initiation temperature range of 60-150 DEG C, 5-35 parts of pigments and fillers and 0-20 parts of aids. A good edge-sealing effect on the heat-sensitive base material is achieved, cracks generated on the side face of the heat-sensitive base material are effectively avoided, electrostatic spraying is adopted, the edge-sealing process is simple and convenient, and the powder coating is suitable for edge sealing of base material workpieces of various shapes.

The invention relates to a medium-density fiberboard, which comprises a medium-density fiberboard body, wherein an edge-sealing coating is arranged on the lateral surface of the board body; a thermosetting coating is arranged on the edge-sealing coating and the surface of the board body; the edge-sealing coating is obtained by electrostatically spray-coating and curing an edge-sealing powder coating on the lateral surface of the board body; the thermosetting coating is obtained by electrostatically spray-coating and curing a low-temperature curing powder coating on the edge-sealing coating and the surface of the board body. According to the medium-density fiberboard, a good edge sealing effect can be achieved, and cracks in the lateral surface of the medium-density fiberboard are effectively avoided; an electrostatic spray-coating mode is adopted, so that an edge-sealing process is simple, convenient and suitable for the edge sealing of substrate workpieces in various shapes.

The invention relates to biomedical composites, particularly to a preparation method for a porous nano-composite support material of bone tissue engineering. The scheme of the invention is that the preparation method comprises the following steps: mixing Nano-HA ((Hydroxy-apatite) and PLLA (Polylactic acid) materials at the temperature of 50-70 DEG C, carrying out ultrasonic oscillation, and then performing electromagnetic stirring until the NAno-HA is uniformly and completely dispersed to obtain gel; transferring the gel to the environment with the temperature of minus 5 DEG C to minus 3 DEG C to be subjected to low-temperature formation, and filling biological materials, so as to obtain the porous nano-composite support material of the bone tissue engineering. According to the method, provided by the invention, a three-dimensional porous Nano-HA/PLLA artificial bone can be prepared through the combination of the Nano-HA and the PLLA; the three-dimensional porous artificial bone support material integrates the advantages of both the Nano-HA and the PLLA, the flexibility, biodegradability and biomechanical property are improved, adhesion growth and vascularization of bone cells can be better facilitated, and the healing speed and effect of bone defect parts with transplanted artificial bones are greatly improved.

The invention discloses a permanent magnetic synchronous generator rotor for wind power generation. The permanent magnetic synchronous generator rotor comprises permanent magnetic steel bars, a rotor core and a rotating shaft. The permanent magnetic synchronous generator rotor further comprises first hole slots and air slots. The permanent magnetic steel, the rotor core and the rotating shaft are successively distributed in a clinging manner from outside to inside in one circumferential axis. The rotating shaft is a solid shaft. Hot interference fit is utilized between the rotating shaft and the circumference which engages with the rotor core. Furthermore one side circumference of the rotor core is provided with a plurality of semicircular air slots. The central circumference between the outer diametric plane and the inner diametric plane of the rotor yoke is provided with a plurality of circular first hole slots. The number of the first hole slots is equal with that of the permanent magnetic steel bars. Furthermore the center of each first hole slot is in the central axis of each magnetic steel bar. The permanent magnetic synchronous generator rotor satisfies technological requirements of small weight, high control flexibility, simple structure, high vibration resistance, high efficiency and high reliability in a power generator in a wind power generation field.

The invention relates to an external column type voltage limiter for an urban rail catenary. The external column type voltage limiter comprises a cross arm of a tower and further comprises a lightning arrester body and a post insulator. A spherical electrode is installed on the lightning arrester body, the lightning arrester body is connected with the post insulator through a conductive metal bar, a run-on plate is further installed between the tower cross arm and the post insulator and is in tight electric connection with the tower cross arm, the lightning arrester body is in tight electric connection with a fitting positioned on the post insulator, and an air gap is formed between the run-on plate and the spherical electrode. The external column type voltage limiter can be installed away from the insulator and provide multiple protections for the insulator and is suitable for being used on an urban rail catenary system.

The invention discloses a modular design method of a novel steel structure, which comprises the following steps of: 1) establishing a steel structure frame model according to the requirements of customer architectural styles and architectural specifications, and analyzing the stress conditions of all parts and connecting pieces of a steel structure frame after a wall body and a floor slab are established by applying finite element analysis software; 2) according to the steel structure frame model, automatically calculating and outputting an installation sequence of each part and each connecting piece of the steel structure frame by computer software, and labeling; 3) according to a stress condition analysis result, selecting materials meeting corresponding mechanical property requirementsfor industrialized production of all components and connecting pieces of the steel structure frame, and correspondingly marking the labels determined in the step (2) on all the components and the connecting pieces; and 4) transporting all components, connecting pieces, wallboards and floors of the steel structure frame which is produced in an industrialized mode to a construction site to constructa house of a steel structure. The method has the beneficial effects that installation is convenient and rapid, and the construction cost is saved.

A high-efficiency and high-power-density permanent magnet synchronous motor for an electric aircraft comprises a stator iron core, a stator winding, a permanent magnet, a rotor iron core, a rotor support, a rotating shaft, a front bearing, a rear bearing, a machine shell and a rear end cover; light weight of the motor is achieved by increasing the inner diameter of a motor stator and reducing the axial length; the motor stator winding adopts a fractional slot and concentrated double-layer winding structure, so that the winding end size is reduced; the stator iron core adopts an ultrathin silicon steel sheet; the rotating shaft adopts a hollow shaft structure to reduce weight; the rotor bracket adopts a spoke-shaped structure, so that the weight of the rotor is reduced; the rotating shaft, the rotor support and the rotor iron core are sequentially connected together in a key groove fit mode from inside to outside. The permanent magnets are axially segmented, so that eddy-current loss is reduced, and motor efficiency is improved; the outer side of the casing adopts a radiating fin structure, so that the weight is effectively reduced while the radiating capability of the motor is ensured; and the end cover and the components are packaged together, so the performance requirements of high power density and high efficiency of the driving motor of the electric aircraft are met.

The invention provides a visual fuel rod. The visual fuel rod is characterized in that the visual fuel rod includes a lower plug (1), a fuel shell (2), a liquid column (3), an upper plug (4) and a positioning winding wire (5). The liquid column (3) is arranged in the fuel shell (2). The refractive index deviation of the liquid column (3) and the fuel shell (2) is within a range of 1%. The lower plug (1) and the upper plug (4) are connected to the two ends of the fuel shell (2) so as to seal the liquid column (3) in the fuel shell (2). The positioning winding wire (5) wraps and is fixed to theouter surface of the fuel shell (2). Through the arrangement of liquid with the same or similar refractive index with the fuel shell (2) in the fuel shell (2), the requirements of optical velocity measuring equipment for refractive index matching and transmittance can be satisfied, and the requirements of mechanical strength can be satisfied. The visual fuel rod can be used for studying a velocityfield, a pressure field and the like inside a fuel assembly.

The invention relates to a method for solidifying edge seals of a thermally sensitive base material. The method includes: A) mounting the thermally sensitive base material with powder coating sprayed on every lateral side on a mounting piece of solidifying equipment; B) turning on the solidifying equipment so that a solidifying source can solidify one or two lateral sides of the thermally sensitive base material; C) rotating the mounting piece to drive the thermally sensitive base material to rotate so that the solidifying source can solidify all the laterals sides of the thermally sensitive base material; D) realizing quick edge sealing of the thermally sensitive base material. The method has the advantages that the problem that edge seal coating solidification may fail due to large impact in an edge seal coating solidification process since water moisture is evaporated from the interior of the thermally sensitive base material to the lateral sides of the thermally sensitive base material massively and quickly is avoided, edge sealing efficiency of the thermally sensitive base material is improved greatly, and the method is suitable for large-scale industrialized application.