5results about How to "The experiment process is simple" patented technology

This invention discloses the application of a silver group cluster composite catalyst in the epoxy ring-opening reaction. The silver group cluster composite catalyst of this invention is Ag. 32 / AC, where Ag 32 =Ag 32 (dppp)4(CCR) 22 dppp = 1,3-bis(diphenylphosphine)propane, CCR = 4-tert-butylphenylacetylene, AC = supercapacitor activated carbon. The silver group cluster composite catalyst provided by this invention exhibits excellent catalytic activity in the ring-opening reaction of styrene and methanol. The catalytic system of this invention operates under mild reaction conditions, achieves 100% selectivity, and efficiently and directionally generates the target product 2-methoxy-2-phenylethanol, effectively suppressing side reactions and providing a feasible route for the green and efficient synthesis of this type of product.

The invention discloses a coal bed gas horizontal well drilling fluid plugging performance evaluation method, and relates to the technical field of oil and gas exploitation, coal dust and coal gangue returned by a coal bed gas horizontal well are taken, dried and crushed, a cementing agent is added, a glue-containing mixture is prepared, and curing and cutting are performed to obtain a coal rock plate or a coal rock plate with microcracks; a coal rock plate is used as a filtration medium of the plugging instrument, and the measured plugging filtration loss and the plugging filtration loss reduction rate are used as evaluation indexes for evaluating the coal rock plugging anti-collapse performance of the drilling fluid; a coal rock plate with micro-cracks is used as a filtration medium of the plugging instrument, and the measured plugging filtration loss and the plugging filtration loss reduction rate are used as evaluation indexes for evaluating the plugging anti-collapse performance of the drilling fluid on coal rock with micro-crack development, so that the anti-collapse performance of horizontal well water-based drilling fluid such as coal bed gas and the like can be reflected more reliably, quickly and accurately; the method is used for guiding safe and rapid construction of horizontal wells easy to collapse, such as deep coal bed gas and carbonaceous mudstone.

The invention belongs to the field of structural strength testing, and particularly relates to a honeycomb equivalent parameter simulation method based on probability distribution. At present, the research on honeycomb equivalent parameter simulation does not fully consider the probability distribution problem caused by dispersity. The method comprises the following steps: scanning random N honeycombs, and measuring structural parameters of each honeycomb; performing statistical analysis on each structural parameter measurement value of the honeycomb to obtain a corresponding probability density function; performing Monte Carlo simulation based on the obtained probability density function to generate a random number sequence; in combination with the random number sequence and a cellular equivalent parameter formula, simulating to obtain a cellular equivalent parameter simulation value; and carrying out probability statistical analysis, establishing a frequency distribution histogram of the honeycomb equivalent parameters, obtaining a probability density function of the honeycomb equivalent parameters, and obtaining corresponding honeycomb equivalent parameter values in combination with given reliability. Experiments are simple and cost is low.

The present application relates to the field of fluorescent powder preparation, especially to a red light fluorescent powder coated with quantum dots and a preparation method and application thereof.A red light fluorescent powder with high light-emitting thermal stability and high temperature resistance is excited by blue light, and the general formula of the combination ratio is K 1.9 (MEA) 0.1 TiF6: x Mn 4+ @GQDs y mg / mol ; wherein 0.01<= x <=0.12, 1<= y <=10.The preparation method is ion exchange method and hydrothermal synthesis method, the raw materials are mixed and stirred at room temperature, then KF*2H2O, HF, K 1.9 (MEA) 0.1 TiF6: x Mn 4+ and GQDs are mixed and fully reacted, and the obtained mixture is washed and dried to obtain the final product.The fluorotitanate red light fluorescent powder of the present application can be excited by the blue light emitted by InGaN chip, has excellent high temperature fluorescent performance and heat resistance, and has good market prospect.

This invention provides a method based on β'' A method for preparing Al2O3 and N-doped C composite-coated Na3V2(PO4)2F3 electrode material. First, citric acid, vanadium pentoxide, ammonium dihydrogen phosphate, and sodium fluoride are sequentially dissolved in deionized water and stirred at 60°C until gel formation occurs. After drying, the resulting powder is placed in a tube furnace and subjected to a two-step heat treatment process to obtain Na3V2(PO4)2F3. Then, Na3V2(PO4)2F3 and dopamine hydrochloride are dispersed in an aqueous solution of tris(hydroxymethyl)aminomethane hydrochloride, stirred, and then... β'' -Al2O3, after stirring for another 23 h, was filtered, dried, and then placed in a tube furnace for heat treatment to finally obtain β'' A Na3V2(PO4)2F3 electrode material was developed by coating Al2O3 and N-doped C. This electrode material is simple to prepare, and sodium-ion half-cells assembled using this material as the positive electrode exhibit ideal capacity performance and stable cycle performance, demonstrating potential application value in sodium-ion batteries.