36results about How to "Experimental repeatability is high" patented technology

The invention relates to a sensing mechanism of a two-dimensional airfoil model. The sensing mechanism comprises a pressure sensor group, a plurality of first conduits, a second conduit and a cavity,wherein the pressure sensor group is vertically fixed in a mounting hole in a surface of the two-dimensional airfoil model, and a pressure measuring surface of each pressure sensor in the pressure sensor group is vertical to the surface of the two-dimensional airfoil model; a plurality of mounting holes perpendicular to the surface of the two-dimensional airfoil model are formed in the surface ofthe two-dimensional airfoil model; the cavity is fixed in the two-dimensional airfoil model; reference pressure ends of the pressure sensors in the pressure sensor group are connected to the cavity through the first conduits, and the plurality of pressure sensors in the pressure sensor group are in one-to-one correspondence with the plurality of first conduits; the cavity is connected with the first end of the second conduit, and the second end of the second conduit is arranged in the atmosphere outside the two-dimensional airfoil model. According to the mechanism disclosed in the invention, measurement precision of the two-dimensional airfoil surface pressure distribution can be improved.

The invention relates to a liquefied natural gas (LNG) drain diffusion and pool fire combustion simulated experimental platform and an LNG drain diffusion and pool fire combustion simulated experimental method. The platform comprises an experimental system, a testing system and a control system, wherein the experimental system consists of an LNG storage tank, heat-insulation pipes, experimental devices and an anti-explosion isolating wall; the testing system consists of an electronic balance, an ignition system, a methane concentration detector, a thermocouple tree, a data acquirer and a camera; and the control system consists of a programmable logic controller (PLC) system, various display instruments and a control valve. By designing an angle-adjustable LNG surface spreading experimental device with a changeable surface material, spreading and gasification diffusion experimental simulation of LNG on surfaces of different substances and at different flowing speeds can be carried out; and by matching the ignition system and the methane concentration detector, LNG gas cloud concentration change monitoring and gas cloud ignition can be realized, and data and images are acquired automatically. The platform has the advantages of short experimental time, low cost, high experimental efficiency and the like. By the design, experimental steps are less, experimental safety is guaranteed under the condition of severe monitoring and control, the platform is easy and convenient to operate, and experimental repeatability is high.

The invention belongs to the technical field of nanometer material preparation and metal ion detection, and in particular relates to a nitrogen-doped fluorescent carbon quantum dot and a preparation method thereof. A method for preparing nitrogen-doped fluorescent carbon quantum dots, comprising configuring a mixed solution of carboxymethyl cellulose and ethylenediamine; placing the mixed solution in a high-pressure reactor for hydrothermal reaction to obtain a reaction solution; Ultrasound, centrifugation, and filtration treatment to obtain a filtrate; dialysis treatment is performed on the filtrate with ultrapure water, and the solid product obtained by dialysis is freeze-dried to powder to obtain the obtained product. The method has simple preparation process, green environmental protection, low cost, simple equipment and is suitable for large-scale production, and the prepared carbon quantum dots have good water solubility, stable fluorescence performance, uniform particle size, non-toxic and harmless, biocompatibility, etc. Excellent performance to expand the application field of carbon quantum dots.

The invention discloses a method for testing the twisted flatness of fabrics after washing. The existing method for detecting the flatness of fabrics after washing does not consider the detection of flatness of hand washing and wringing. The stick body of the device of the present invention passes through the second baffle and is threadedly connected with the moving cylinder; the moving cylinder is provided with a positioning ring and two symmetrical positioning pins; the inner side of the first baffle is fixed to the static cylinder; the static cylinder is provided with a positioning ring and two positioning pins that are symmetrical up and down. The method for testing the flatness of fabric twisting in the present invention: after the fabric is ironed, it is cut and soaked in a mixture of water and detergent, and after taking it out, it is fixed in a fabric twisting simulation device and twisted; it is unfolded and hung to dry; the fabric wrinkle image is collected In the most serious area of ​​arching, the pixel points are filtered and transformed, and the total entropy of the image in the six filtering directions of each sample is obtained; flatness index. In the invention, the flatness test is carried out on the simulated twisted fabric after washing to obtain the evaluation index of the flatness of the fabric.

The invention relates to an LNG leakage water curtain restraint experiment device. The LNG leakage water curtain restraint experiment device mainly solves the problem that an LNG leakage water curtain restraint experiment device is not available yet in the prior art. The LNG leakage water curtain restraint experiment device comprises a discharging system, a water curtain system, a data acquisition system and a control system, wherein the discharging system comprises an LNG storage tank, an LNG discharging tank, an inert gas cylinder and a discharging spray head, the water curtain system comprises a water inlet pipeline and a water curtain nozzle, and the data acquisition system comprises a signal processor, a thermocouple, a methane concentration detector, an anemometer, a hygrometer and a high-speed camera. By the adoption of the LNG leakage water curtain restraint experiment device, the problem that LNG leakage water curtain restraint experiment device is not available yet in the prior art is well solved. The LNG leakage water curtain restraint experiment device can be applied to an LNG leakage water curtain restraint experiment.

The invention discloses a bioreactor for simulating intraocular pressure, which is used for constructing tissue engineering cornea. The reactor provides corneal stromal cells and corneal endothelial cells with mechanical pressure similar to intraocular pressure through continuous circulation of culture fluid, better maintains the characteristics of corneal stromal cells and endothelial cells, promotes the production of extracellular matrix, and improves tissue engineering The transparency and mechanical toughness of the cornea make the tissue-engineered cornea more consistent with the biological characteristics of the cornea in vivo.

The invention provides a quantum dot light diffusing agent and a preparation method thereof. The preparation method comprises the steps of: pretreating polymethyl methacrylate to obtain a polymethyl methacrylate dispersion; dissolving quantum dots and additives in a co- In a solvent, a mixed solution A is obtained; the mixed solution A is mixed with the polymethyl methacrylate dispersion to obtain a mixed solution B, and under the protection of an inert gas, the temperature and pH value of the mixed solution B are adjusted, Purify after fully stirring to obtain the microsphere structure containing the quantum dots; dry and grind the microsphere structure to obtain the quantum dot light diffusing agent. The present invention wraps quantum dots and additives with polymer materials, which can improve the stability of quantum dots in the processing and aging process of optical function boards, and improve the application range of quantum dot light diffusing agents; the preparation process is simple and the equipment cost is low. Low, high experimental repeatability, conducive to large-scale industrial production and promotion.

The invention relates to an LNG leakage water curtain inhibition experiment method which aims at mainly solving the problem of the blank of the LNG leakage water curtain inhibition experiment method in the prior art. According to the technical scheme adopted by the invention for well solving the problem, due to the adoption of the LNG leakage water curtain inhibition experiment method, LNG leakage water curtain inhibition experiment is implemented by virtue of an LNG leakage water curtain inhibition experiment device; the experiment method comprises the following steps: (1) guiding LNG in an LNG storage tank into a leakage tank; (2) opening a leakage nozzle and spraying the LNG out of the leakage nozzle; (3) starting a data acquisition system, carrying out data acquisition and recording image; (4) starting a water curtain system, spraying water out of a water curtain nozzle to form a water curtain, and carrying out data acquisition by virtue of the data acquisition system and recording the image; and (5) sequentially closing the leakage system, the water curtain system and the data acquisition system after the data collected by a monitoring point array is stable so as to end the experiment. The method can be applied to the LNG leakage water curtain inhibition experiment.

The invention relates to a method for manufacturing an optical micro-nano pattern on the surface of a lithium niobate film, which belongs to the technical field of micro-nano processing. The method comprises the following steps: manufacturing a layout required by electron beam exposure; cleaning and drying a lithium niobate substrate; sputtering a metal conductive layer on the lithium niobate substrate; spin-coating the lithium niobate substrate with electron beam glue; carrying out first electron beam exposure on the lithium niobate substrate to manufacture a mark; carrying out developing andfixing; carrying out magnetron sputtering of metal on the lithium niobate substrate to manufacture a metal mark; removing the photoresist and stripping a metal-masked pattern to prepare a lithium niobate sheet with a metal bulge mark; spin-coating the lithium niobate sheet with electron beam glue; carrying out second electron beam exposure on the lithium niobate sheet to manufacture a pattern; carrying out developing and fixing; and carrying out pattern transfer to form a micro-nano structure. By means of the method, a pattern with a steep side wall can be manufactured on a non-conductive lithium niobate material, a micro-nano pattern with the size smaller than 900nm can be manufactured, the manufactured optical waveguide is large in refractive index contrast ratio, the size of an opticaldevice can be reduced, and the performance of the optical device can be improved.

The invention discloses a preparation method of a clean composite photo-thermal agent with excellent photo-thermal effect; the preparation method includes the following steps: taking dopamine hydrochloride (DA) as a reaction monomer, taking water-soluble alcohol and deionized water as a mixed solvent, adding a proper amount of stronger ammonia water to adjust the pH of the solution, and then carrying out oxidation self polymerization full reaction to prepare polydopamine (PDA) nanoparticles having uniform particle size; dispersing the obtained PDA nanoparticles in a proper amount of deionized water to obtain a dispersion liquid, then mixing with a bivalent copper salt solution, and undergoing a complex reaction, to prepare a PDA-Cu<2+> complex; taking the obtained solution as a seed liquid, adding sulfide as a sulfur source, carrying out a full reaction under certain conditions, preparing composite microspheres with CuS loaded on PDA, then dialyzing to filter out unreacted small molecules, and thus obtaining a dispersion liquid of composite microspheres. The photo-thermal effect of the synthesized material is improved, moreover, the synthetic method is green, and the product is clean; meanwhile, the preparation method has high repeatability of experiments and is easy for subsequent promotion and application.