76results about How to "Reduce size effect" patented technology

The invention discloses a large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests. The machine comprises a measuring and controlling unit (1), a hydraulic servo unit (2), a loading unit (3) and a soil sample preparing unit (4). The loading unit (3) comprises a Z-direction vertical loading frame, an X-direction horizontal loading frame and a Y-direction horizontal loading frame, the three frames are perpendicular to each other, and the three frames all have independent loading ability. The hydraulic servo unit (2) comprises an X-direction horizontal loading actuator (311), a Y-direction horizontal loading actuator (312) and a Z-direction vertical loading actuator (31). The measuring and controlling unit (1) is in separate communication connections with three electro-hydraulic servo loading cylinders of the hydraulic servo unit (2). The large bidirectional dynamic/static direct-shearing machine is used in coarse-grained soil shearing performance tests, coarse-grained soil shearing performance tests on reinforced contact interface and coarse-grained soil shearing performance tests on concrete interface under the dynamic/static loading effects of simulation traffic loading.

The invention relates to a temperature control pile-soil interface direct shear test device which comprises a portal frame, a lateral constant stiffness loading system, a pile-soil interface simulation system, a water circulation temperature control system, a normal loading system and a data collection system. The portal frame mainly provides a counter-force supporting point for the other systems. The lateral constant stiffness loading system comprises a counter-force frame, a spring fixing plate, a spring, a spring guide rod and a loading plate; the pile-soil interface simulation system comprises a pile lateral soil body box and a pile body box; the water circulation temperature control system comprises a constant temperature water tank, a heater, a refrigerator, a circulating water pump, a water guiding pipe, a valve, a flow meter and a temperature sensor; the normal loading system mainly refers to server hydraulic loading. According to the device, pile-soil interface addition temperature stress monitoring testing, hot and cold cycle after-construction pile-soil interface shear-resistance change rule testing and other testing during temperature field changing can be performed, and then energy pile load-carrying performance impact factors are analyzed.

The present invention provides a carbon nano-tube/heat conduction silicone grease composite material and a preparation method thereof. The carbon nano-tube/heat conduction silicone grease composite material comprises carbon nano-tubes and a heat conduction silicone grease, wherein the heat conduction silicone grease comprises 10-15 wt% of methyl silicone oil, 35-60 wt% of aluminum nitride, 20-40 wt% of silicon carbide, 5-9 wt% of nanometer silver wire, and 20-30 wt% of a dispersant, and a mass ratio of the carbon nano-tubes to the heat conduction silicone grease is 0.01-0.1:1. The concrete preparation method comprises: adding the heat conduction silicone grease into the mixed solution of chloroform and ethanol, stirring until uniformly mixing, adding the carbon nano-tubes being subjected to acidification and esterification modification treatment, uniformly mixing to obtain a mixed slurry, carrying out low-temperature and low-speed ultrasonic treatment on the mixed slurry, taking out, drying in a blasting drying oven until the solvent is completely evaporated, and cooling to a room temperature to obtain the product. According to the present invention, the preparation method has advantages of simpleness, strong operability, high performance price ratio and good practicability, and is suitable for large-scale industrial production, and the prepared composite material has advantages of good heat dissipation, good heat resistance, good sealing property and good mechanical performance, and can be used for power transmission and transformation lines.

The invention discloses a reinforced poly-ether-ether-ketone composite material with nano SiO2 chemically grafted to the surfaces of carbon fibers and a preparation method of material. The composite material is prepared from, by weight, 65-100 parts of poly-ether-ether-ketone, 5-30 parts of the carbon fibers, 0-10 parts of the nano SiO2, 0.5-3 parts of gamma-aminopropyl triethoxysilane and 0.5-3 parts of gamma-glycidyl ether oxypropyl trimethoxysilane. According to the composite material, modified carbon fibers are obtained by chemically grafting the nano SiO2 to the surfaces of the carbon fibers, so that the interface bonding performance between the carbon fibers and matrix resin is improved. Meanwhile, the modified carbon fibers are added into PEEK matrix as a reinforcing filler to improve the mechanical performance and wear resistance of PEEK and reduce the friction coefficient and wear rate of the material so that the modified-carbon-fiber-reinforced PEEK-based composite material can be applicable to extreme working conditions such as high speed, heavy loads and oil-free lubrication.

The invention provides a preparation method of a novel high-efficiency haze filtration silver nanowire net and MOFs (metal-organic frameworks) composite porous fiber film material. The preparation method is characterized by comprising the following steps of preparation of silver nanowires, preparation of MOFs, preparation of a spinning precursor solution, preparation of a spinning solution, electrostatic spinning, preparation of suction filtration dispersing liquid and suction filtration and filming. The preparation method has the benefits that the preparation method of the novel high-efficiency haze filtration silver nanowire net and MOFs composite porous fiber film material prepares a composite fiber film by using the silver nanowires in certain diameters and the MOFs in certain particlesizes for doping; pore sizes of the fiber film formed by the spinning are used for filtration; at the same time, lower voltage is applied; particulates are collected by a remote electrostatic force of the silver nanowire; an filtration effect is improved; and since the silver nanowires have a sterilization function, the composite porous fiber film material can achieve a multifunctional haze filtration effect.

The invention provides a fatigue test device for an equal-thickness pavement structure on the basis of MTS. The fatigue test device comprises a subgrade and pavement model and an MTS loading device, and is characterized in that a loading head is fixed at the lower end of an MTS acting head; the lower surface of the loading head is arc-shaped; a rubber layer which is consistent to a tire of an automobile is fixed on the loading head; the MTS acting head applies an acting force with corresponding frequency and load to the subgrade and pavement model; and a sensor is arranged in the subgrade and pavement model. A fatigue test method comprises the following steps of (a) constructing the subgrade and pavement model; (b) hoisting a model case; (c) mounting the MTS acting head; (d) connecting the loading head; (e) setting a loading model; (f) acquiring data; (g) stopping loading; (h) continuing testing; and (i) analyzing data. Compared with special accelerating and loading equipment, the fatigue testing device and the fatigue testing method have the advantages of low cost, short loading period, reasonable test data and low test cost, have obvious beneficial effects, and are convenient to popularize and use.

The invention relates to a method for preparing antistaling agent of vegetable and fruit, wherein the invention uses soluble macromolecule material as film carrier to be dissolved in deionized water to obtain filming solution; with agent, disperses nanometer material into said filming solution. And the invention also provides relative application, while the antistaling agent has long antistaling time.

The invention discloses a direct current cable insulating material added with rare earth nanoparticles and a preparation method for the direct current cable insulating material. The direct current cable insulating material comprises a polyolefin material, modified rare earth nanoparticles, a peroxide cross-linking agent and a phenolic antioxidant, wherein the modified rare earth nanoparticles are obtained by modifying the rare earth nanoparticles by using a silane coupling agent. The direct current cable insulating material added with the rare earth nanoparticles is obtained by mixing the modified rare earth nanoparticles, the polyolefin material and the phenolic antioxidant by adopting a closed mixing mill and performing cross-linking by using the peroxide cross-linking agent. According to the direct current cable insulating material added with the rare earth nanoparticles and the preparation method for the direct current cable insulating material, the modified rare earth nanoparticles are added, so that spatial charge accumulation characteristics of insulation of a nano composite material are improved, spatial charge accumulation is suppressed, and the influence of field intensity enhancement caused by direct current and temperature gradient is weakened.

The invention claims an electromagnetic type dynamic plate load test detecting device and a method. The device disclosed by the invention is characterized in that an electromagnet assembly, an impacting rod and an impact seat plate assembly are respectively arranged above an external sleeve, in the external sleeve and under the external sleeve; a plurality of levels of electromagnet accelerating coils are arranged on the inner side wall of the external sleeve; the levels of electromagnet accelerating coils are respectively in external connection with a circuit control system; the impact seat plate assembly comprises an impact seat and a bearing flat plate; the bearing flat plate is fixed at the bottom of the impact seat; the impact seat plate assembly is statically arranged; the external sleeve is sleeved into the impact seat; and the method disclosed by the invention is characterized by realizing acceleration of the impacting rod by discharging via the plurality of levels of electromagnet accelerating coils in the process of impacting the impact seat via the impacting rod in order to improve the impact energy and speed. By adopting an electromagnetic type graded accelerating impact rod in the device disclosed by the invention, the impact energy and the speed of the impacting rod can be effectively improved; the realized impact force is more than 1000 times to the weight of the impacting rod; and electric supply is taken as a dynamic source, so that the device disclosed by the invention can be better applied to vertical and horizontal foundation plate load test detection.

The invention provides a preparation method of a fiber reinforced polymer sheet, and relates to a manufacturing method of the fiber reinforced polymer sheet used for enhancing and reinforcing an engineering structure. The preparation method comprises the following steps of: preparing a mixed fiber cloth; performing local reinforcement on two ends; and obtaining a finished product by a process of folding the mixed fiber cloth and prefabricating the two ends into waveform. The fiber reinforced polymer (FRP) sheet prepared by the method is small in width, is easy to be clamped and anchored by a wave-shaped-gear grip anchor, can bring the ultimate strength into full play, can significantly improve the reinforcement effect of the engineering structure, and is simple in manufacturing process, convenient in construction and low in cost. The method provided by the invention has the characteristics of flexible preparation mode, simple process, less production equipment, low cost and the like. The FRP sheet prepared by the method is widely used for enhancing and reinforcing newly-built or built engineering structures, and is particularly suitable to be used as a prestressed material to reinforce bridges or building constructions, and used as a stay cable, a suspension rod and the like for manufacturing bridges.

The invention discloses a graphene oxide-modified polyurethane-cellulose battery separator and a preparation method thereof, and belongs to the field of a lithium battery material. The composite cellulose separator is a wet-state graphene oxide-modified polyurethane-cellulose film material which is prepared by dissolving cellulose in an ionic liquid [Amin]Cl, performing crosslinking reaction with6-methylene diisocyanate and then mixing with graphene oxide, the separator is prepared by solvent replacement and drying, and the composite separator can be used for a non-aqueous lithium battery separator material. The separator prepared by the method has relatively good thermal resistance, chemical solvent resistance and mechanical property; and moreover, the regenerative cellulose is used as araw material, and the separator has the advantages of low cost and biological degradability.

The invention discloses a lignin-based biodegradable polymer composite film which is prepared from the following raw materials in parts by weight: 100 parts of a biodegradable polymer material, 5-30 parts of lignin and 0.2-6 part of caprolactone. The invention also provides a preparation method of the lignin-based biodegradable polymer composite film. The preparation method has the advantages thatthe prepared lignin-based biodegradable polymer composite film is high in tensile strength and tear strength, resistant to ultraviolet radiation, flame-retardant, simple in preparation process, low-carbon, environment-friendly, high in production efficiency and easy to industrialize.

The invention relates to a pressure sensor which is applicable to grain pressure testing and belongs to the field of sensors. The pressure sensor comprises a bottom plate, side plates, sleeves, springs, a sliding resistor, pin shafts, a guiding rod and a top plate, wherein the bottom plate and the side plates are welded into a whole and form a cube which is provided with an opening formed in the upper surface, the sleeves are fixed on the upper surface of the bottom plate, each spring is installed outside one sleeve, the pin shafts and the guiding rod are fixed on the lower surface of the top plate, the pin shafts are matched with the sleeves, the top plate can move upwards and downwards, and the sliding resistor is fixed between the bottom plate and the top plate. The springs are deformed after the pressure of grain acts on the top plate of the sensor, the top plate moves downward to drive the guiding rod to move downward, the resistance value of the sliding resistor is changed, a voltage signal is changed, and therefore pressure sensing can be achieved. According to the pressure sensor, the theory of large deformation of the springs is utilized, the bearing area is large, and the grain granular mixtures can uniformly and effectively act on the bearing surface of the sensor. The pressure sensor has the advantages of being simple in structure, good in stability, high in reliability, good in durability and low in cost.

The invention discloses a method for preparing a paramagnetic polyphosphazene nanotube magnetic resonance imaging contrast agent. The method is characterized by firstly taking hexachlorocyclotriphosphazenes and 4,4'-dihydroxydiphenylsulfone as comonomers and triethylamine as an acid binding agent to carry out polymerization under room temperature to prepare the polyphosphazene nanotube and obtaining a polyphosphazene nanotube ligand after purifying the polyphosphazene nanotube; and then reacting the ligand with paramagnetic metal inorganic salt, finally centrifuging the reactant, washing the product three times respectively with water and absolute ethyl alcohol, thus obtaining the solid powder of the magnetic resonance imaging contrast agent after drying. The method is strong in operability, wide in application range, simple in equipment requirement, low in cost and high in yield and can be used for mass production in industry application. The magnetic resonance imaging contrast agent of the invention is a novel polymer nanotube magnetic resonance imaging contrast agent. The relaxation rate of the magnetic resonance imaging contrast agent is as high as 42.88-237.83mmol/L*s and is 12-65 times that of the commercial magnetic resonance imaging contrast agents Gd-DTPA (with relaxation rate of 3.64mmol/ L*s).

The invention discloses thick-film resistor paste with a low size effect. The thick-film resistor paste comprises a functional material, glass powder, light-burned mullite, dolomite, an organic carrier and an optional additive. According to the invention, the light-burned mullite and the dolomite are introduced to optimize the graphic effect after the resistor is sintered, so that the resistor has the advantage that the graphic effect is not obvious, and the use requirements of thick film integrated circuits with different graphic sizes and chip resistor products with different specifications can be met.

The application discloses functional nanometer material-antigen composite nanoparticles and a preparation method and application thereof. The composite nanoparticles comprise a functional nanometer material and an antigen. The preparation method is simple, the defect that a free antigen is weak in immunogenicity to cause that ideal tumor immune efficacy cannot be achieved, is overcome, and the problem that at current, imaging and tumor immunotherapy are separate, can be solved. The dual purposes of fluorescent imaging or magnetic resonance imaging and tumor immunotherapy can be achieved.

The invention discloses an anti-aging flame-retardant PVC material and a preparation method and application of the anti-aging flame-retardant PVC material in a wire or a cable. The anti-aging flame-retardant PVC material comprises the following raw materials: PVC, a calcium-zinc stabilizer 5-10, octyl phthalate, calcium carbonate, zinc stearate, an antioxidant, acidic lignin, zinc stannate, dimer acid diisocyanate and ALLCHEM360. According to the preparation method of the wire or the cable, the preparation comprises the following steps: preparing by using the materials, mixing the acidic lignin, the zinc stearate, the zinc stannate, the dimer acid diisocyanate and the ALLCHEM360 for 10-30 minutes, and then carrying out ball milling on the mixture for 2-8 hours to obtain a ball-milled mixture; and mixing the ball-milled mixture with other raw materials to obtain a precursor, and carrying out melt blending extrusion and granulation on the precursor to obtain the material. According to the application of the wire or the cable, the material is used for preparing the wire or the cable. The prepared green, environment-friendly, anti-aging and flame-retardant PVC wire and cable material is high in tensile strength, strong in anti-aging capability, good in flame retardance, simple in preparation process, low-carbon, environment-friendly and easy to industrialize.

The invention discloses a method for measuring bending moment strength of concrete. The method includes bending moment strength test equipment, a bending limit moment calculation formula, bending moment strength calculation formula, bending moment failure standards and teat result analysis method. A measured bending moment strength index eliminates size effect caused by the test method, is closerto real bending strength of the concrete, and has good consistency with tensile strength of the concrete. The invention provides the method for accurately measuring the bending capacity of the concrete which uses the bending moment strength as a design parameter and has the beneficial effects on improving the reliability and safety of the structure design of beams and plates.

The invention discloses a processing method of a high-precision printed connector PCB, wherein the processing method comprises performing a drill slot forming step on key areas at two sides of the printed connector, wherein a 1.0 mm stiffened slotting cutter in the drill slot forming step, the holes are intersected, and one hole is drilled every 0.15mm for forming a smooth profile area. A photosensitive dry film for pattern transfer is a Hitachi H-640 thick metal dry film with relatively high hole sealing performance and relatively high electroplating resistance, and in production, a pressure is applied on the product line for keeping a washing pressure to 1kg/cm<2>. The processing method of the high-precision printed connector PCB has advantages of high processing precision, high product reliability, high process capability and low cost.

The invention discloses a test system for simulating the multi-field coupling effect of an offshore wind power rock-socketed pile. The test system comprises a water tank body, the offshore wind powerrock-socketed pile is arranged in the water tank body, the offshore wind power rock-socketed pile is arranged in a rock-soil test box, and the rock-soil test box is arranged on an earthquake simulation system; a turning wind field simulation system is arranged on one side of the offshore wind power rock-socketed pile and can provide a wind field with 180 DEG spatial change; and a wave generation system is mounted in the water tank body, a water supply and drainage system is installed on the side face of the water tank body, and a flow generation system is arranged at the bottom of the water tank body. Simulation of all loads can be realized, 180 DEG real-time conversion simulation of the typhoon wind direction can be realized, and cooperative work among the water tank, the vibration tableand the rock-soil test box can be realized.

The invention discloses a manufacture method of a large-scale geomechanical model. The method comprises the following steps of: (1) pressing prefabricated standard modules; (2) numbering the pressed prefabricated standard modules respectively and making a design drawing with standard modules being assembled into a model; (3) according to the design drawing, employing a caking agent in order to build the standard modules into a shape; (4) introducing a measuring line on a measuring element out of a model body and to connected with measurement equipment. According to a geomechanical model prefabricated standard module building forming method, the production process of a large-scale true three-dimensional mechanical model is improved, serious stratification of enclosing rocks and a deviation phenomenon of pre-buried measurement element caused by stratification molding in a present geomechanical model manufacture process are overcome, and the manufacture quality of the model is improved. The method has the advantages of high efficiency, being fast and economic, simple operation of equipment, uniform model entity, capability of scaled standardized production and the like, and the high quality operation of a three-dimensional mechanical model experiment is effectively ensured.