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

The invention provides a constant volume combustion bomb. The constant volume combustion bomb comprises a bomb body which is internally provided with a cavity serving as a combustion cavity and is in the shape of a cube. The bomb body has six working surfaces serving as main mounting surfaces and auxiliary mounting surfaces formed at eight corners. The main mounting surfaces and the auxiliary mounting surfaces are provided with main mounting holes and auxiliary mounting holes. The constant volume combustion bomb further comprises a main mounting base accommodated in two opposite main mounting holes, a glass mounting base accommodated in another two opposite main mounting holes, a magnetic coupling fan accommodated in the last two opposite main mounting holes and used for driving mixed gas in the combustion cavity of the bomb body rotationally to make the mixed gas form a vortex, and auxiliary mounting bases accommodated in the auxiliary mounting holes to measure the pressure and temperature in the combustion cavity of the bomb body. The invention also provides the corresponding combustion system. The device has a structure adaptive to the combustion conditions of an internal combustion engine, allows comprehensive observation of a combustion process and thus is suitable for premixed combustion heating type constant volume bomb spray combustion diagnosis experiments with various research requirements.

The invention belongs to the technical field of nano material preparation and metal ion detection, and particularly relates to a nitrogen doped fluorescent carbon quantum dot and a preparation methodthereof. The preparation method for the nitrogen doped fluorescent carbon quantum dot comprises the following steps: preparing a mixed solution of carboxymethyl cellulose and ethanediamine; putting the mixed solution in a high-pressure reaction kettle to perform hydrothermal reaction to obtain a reaction solution; performing ultrasonic treatment on the reaction solution, centrifuging, and filtering to obtain filtrate; using super-pure water to perform dialysis treatment on filtrate, and freezing and drying a solid product obtained by dialysis to obtain powder, thereby obtaining the nitrogen doped fluorescent carbon quantum dot. The method is simple in preparation process, is green and environmentally friendly, is low in cost, is simple in equipment and is suitable for large-scale production; and the prepared carbon quantum dot has excellent performances of being good in water solubility, stable in fluorescence property, uniform in grain size, non-toxic and harmless, biocompatible and the like, so that the application field of the carbon quantum dot is expanded.

The invention provides a quantum dot light diffusing agent and a preparation method thereof. The preparation method includes the steps: performing pretreatment on polymethyl methacrylate to obtain a polymethyl methacrylate dispersion liquid; dissolving quantum dots and an additive in a cosolvent to obtain a mixed solution A; mixing the mixed solution A and the polymethyl methacrylate dispersion liquid to obtain a mixed solution B, adjusting the temperature and pH value of the mixed solution B under the protection of an inert gas, performing full stirring, and performing purification treatmentto obtain a microsphere structure containing the quantum dots; and drying the microsphere structure, and performing grinding to obtain the quantum dot light diffusing agent. According to the method, the polymer material is used to wrap the quantum dots and the additive, so that the stability of the quantum dots during the processing and aging of an optical function board can be improved, and the application range of the quantum dot light diffusing agent can be improved; and the method has a simple preparation process, low equipment costs and high experimental repeatability, and facilitates industrial large-scale production and promotion.

The invention discloses a fractal intersection fracture seepage flow experimental system and an experimental method and belongs to the field of geotechnical engineering. The experimental system comprises a water storage tank, a water guide pipe and a water head tank, wherein a water inlet is formed in the water head tank; water flow passes through the water inlet and then enters an experimental main body; the experimental main body comprises an intersectional hollow flow channel slot and a cover plate thereon; a fractal intersection fracture parallel-plate physical model for 3D printing is arranged in the hollow flow channel slot; the model is made by constructing a rough fractal curve based on a fractal function, establishing a three-dimensional stereoscopic model according to the curve by virtue of software and printing by virtue of 3D printing equipment; the model comprises rough fractures and smooth fractures intersecting with one another; the rough fractures and smooth fractures have the same seepage path length; the water outlet is connected with the water collection tank; a water level monitor is arranged above the water collection tank; the water collection tank is connected with the water storage tank by virtue of a communicating pipe; the experimental system further comprises an intelligent regulation device; a pressure sensor and the water level monitor are respectively connected with the intelligent regulation device. The experimental system is applicable to study on the fractal intersection fracture seepage flow 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 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 discloses an apparatus to prepare methane hydrates under normal pressure. The apparatus comprises: a foaming unit for generating foam; a liquid supply unit for providing a low-temperature methane liquid; a reactor unit having the upper end communicated with the foaming unit and the lower end communicated with the liquid supply unit, and used for generating methane hydrates; a data acquisition unit for acquiring interior temperature and resistivity of the reactor unit. The apparatus herein has the advantages that the low-temperature methane liquid is introduced into a storage tankunder the normal pressure and low temperature, high-ratio foam liquid is generated via the foaming device, and methane hydrates are generated during the process where the low-temperature methane vapor moves up and gains contact with the foam to give rise to heat and mass transfer; the whole experimental process is simple to perform, has low experimental environment requirements, is suitable for quick preparation of methane hydrates under normal pressure, and has the advantages of low time consumption, low cost, and high experimental repeatability.

The invention, which belongs to the field of environmental detection by a biological method, discloses a method for detecting the comprehensive content of heavy metal in soil by luminous bacteria andapplication thereof. The method comprises the following steps: removing impurities from a collected soil sample, carrying out air drying, grinding and sieving, adding water to prepare a soil suspension, and carrying out oscillation, standing, filtration and centrifugation to obtain a to-be-detected sample; and determining a relation between the relative luminous intensity of the vibrio fischeri and the concentration of the heavy metal ions by using the vibrio fischeri with low cost in luminous bacteria and establishing a mathematical model to enable each relative luminous intensity to have a heavy metal ion toxicity interval corresponding to the relative luminous intensity, thereby conveniently and quickly detecting the heavy metal pollution of the soil. The method is simple to operate, single in equipment, low in cost and wide in applicability, and has important significance in soil pollution detection.

The invention discloses an under-pressure LNG flash experimental method. The experimental method based on an under-pressure LNG flash experimental platform can be used for processes such as LNG pressure adjustment, LNG jet control and LNG liquid bath measurement and can be further used for conducting a research on a liquid bath scale by under-pressure LNG under free jet or hindered jet under the conditions of different jet apertures, different angles, different heights, different jet distances and the like by adjusting the jet apertures of the LNG nozzles, the bracket angles and heights, and the distances of barriers and the like according to the experimental objective. The experimental method disclosed by the invention can be used for realizing experimental remote operation and data automatic acquisition and has the characteristics of being safe and reliable and high in experimental repeatability. In addition, the method is based on an under-pressure LNG flash experimental platform, and an insulating liquid receiving disc is adopted, so that the gasifying loss of the LNG in the process of forming the liquid bath can be reduced, and therefore, the measurement result is relatively accurate.

The invention provides a carbon@SiOx/C@carbon nanotube composite material and a preparation method thereof. The preparation method comprises the specific steps: S1, dispersing a silicon source and carbon nanotubes in a mixed solvent, adding ammonia water, and obtaining an organic silicon@carbon nanotube composite material after centrifugal drying; and S2, putting the organic silicon@carbon nanotube composite material into a tubular furnace, carrying out primary carbonization in a protective atmosphere, then introducing organic gas for secondary carbonization, and finally cooling to room temperature, so as to obtain the carbon@SiOx/C@carbon nanotube composite material. Organic silicon grows on the carbon nanotubes in situ by a sol-gel method, the prepared carbon@SiOx/C@carbon nanotube composite material comprises internal carbon nanotubes, an external carbon shell and a small-particle SiOx/C layer clamped between the carbon shell and the carbon nanotubes after two times of high-temperature carbonization, the three layers of structures have a synergistic effect, the volume expansion of the composite material is reduced, and the electronic conductivity is improved.

The present invention discloses a washed fabric twisted flatness testing device and method. An existing washed fabric twisted flatness detection method does not consider the flatness detection of wring after handwash. The stick of the device goes through a second baffle plate to be threadingly connected to a moving cylinder. The moving cylinder is provided with a positioning ring and two symmetrical positioning pins. A static cylinder is fixed at the inner side of the first baffle plate and is provided with a positioning ring and two vertically symmetrical positioning pins. According to the washed fabric twisted flatness testing method, a fabric is ironed and then is cut and soaked in a mixture of water and detergent, then the fabric is taken out and fixed to a fabric twisted simulation device to be twisted, the fabric is expanded and suspended to be dry, a most serious protruding area in a fabric wrinkle image is collected and a pixel point is subjected to filtering transformation and the total entropy of the images of each sample in six filtering directions is obtained, and the sum of the total entropy of the fabric in warp, weft and oblique directions is obtained to be a washed fabric flatness index. According to the device and method, the simulated washed and twisted fabric is subjected to flatness testing, and a fabric flatness evaluation index is obtained.

The invention relates to the technical field of biology and particularly relates to a full-automatic sample slide treatment instrument and a sample slide treatment method. The invention provides a full-automatic sample slide treatment instrument. The full-automatic sample slide treatment instrument comprises a workbench, a slide frame for loading a sample slide, a control module and a mechanical arm electrically connected with the control module, wherein the workbench comprises a reaction area, a plurality of reaction tanks are arranged in the reaction area, and one reaction tank is used for containing one reaction liquid; the mechanical arm is arranged on the workbench, and the control module controls the mechanical arm to sequentially feed the slide rack into each reaction tank, so pre-hybridization pretreatment and/or post-hybridization elution of the sample slide are/is automatically completed. During use, reaction liquid is injected into each reaction tank, a sample slide is placed on the slide rack, the slide rack is fixed on the mechanical arm, and then the mechanical arm is controlled by the control module to sequentially feed the slide rack into each reaction tank, so pre-hybridization pretreatment and/or post-hybridization elution of the sample slide are/is automatically completed.

The invention discloses a nanocrystalline TaNbTi medium-entropy alloy coating and a preparation method thereof. The composition elements Ta, Nb and Ti of the nanocrystalline TaNbTi medium-entropy alloy coating are equal in atomic ratio. A TaNbTi refractory medium-entropy alloy coating is prepared on a single-face polished monocrystalline silicon substrate through a direct-current magnetron sputtering method, a TaNbTi single alloy target serves as a target material, a direct-current power source is adopted, the power is 200 W, the working air pressure set value is 0.3 Pa, the deposition temperature is the room temperature, and the rotating speed of a base disc is 15 r/min. The TaNbTi refractory medium-entropy alloy coating prepared through the direct-current magnetron sputtering technology is compact and uniform in microstructure, few in defect and uniform in internal alloy element distribution, and section crystal grains are columnar nanocrystalline. The TaNbTi refractory medium-entropy alloy coating disclosed by the invention has excellent mechanical property and oxidation resistance.

The invention discloses a compliant hinge stress measuring device comprising a base, a spiral micrometer head support, a spiral micrometer head, a strip plate, and a plurality of strain gauges. A plurality of screw holes that are connected with fixed ends of to-be-measured compliant hinges by bolts are formed in the edge of the base in a length direction. The spiral micrometer head support is fixedly arranged at one end of the base. The spiral micrometer head is in threaded connection with the spiral micrometer head support. One end of the strip plate is abutted against the spiral micrometer head; and a long circular slot or a plurality of through holes that is or are connected with free ends of all to-be-measured compliant hinges by bolts is or are formed in the middle part of the strip plate in a length direction. The plurality of strain gauges are pasted on the deformed surfaces of all to-be-measured compliant hinges respectively and are used for collecting deformation signals of all to-be-measured compliant hinges and sending the signals to a static strain analysis device. According to the invention, the same rotation angles are given between different hinges and thus the hinges deform, so that the stress differences between different hinges are measured by the strain gauges. Moreover, the measuring device having a simple structure is operated conveniently.

The invention discloses a method for constructing an oral implant high-occlusion animal model, and relates to the field of oral implant restoration. The method includes the following steps: 1) extracting bilateral maxillary first molars; 2) 21 days after heal of an alveolar socket, implanting an oral implant at the healing site, wherein the implant penetrates the gum and is lower than the occlusalplane; 3) 21 days after bone combination, placing a composite resin crown at the top of the implant to restore occlusal contact with the opposite jaw; and 4) extracting second and third maxillary molars. The model has high molding reproducibility, can generate higher bite force compared with a control, and cause greater strain in surrounding bones.