64results about How to "Excellent process parameters" patented technology

The invention discloses a cordyceps militaris culture medium polysaccharide, and a separation and purification method and application thereof. The polysaccharide comprises the following monosaccharides by molar percentage: 0.11% of ribose, 0.11% of rhamnoside, 0.45% of arabinose, 0.13% of xylose, 14.50% of mannose, 83.96% of glucose and 0.73% of galactose. Through the adoption of the extraction method provided by the invention, the biological activity of the cordyceps militaris culture medium polysaccharide P1 is not influenced, the obtained polysaccharide pure product P1 has high purity and stable property, has obvious effects in the aspects of anti-oxidation, uric acid reduction and bacteriostasis, and is beneficial to human metabolism. The cost is low, and the polysaccharide P1 pure product can be further used for the development of health products, medicines and cosmetics.

The invention discloses mono-disperse gallium oxide powder and a method for preparing high-density ceramic targets from the mono-disperse gallium oxide powder. The method includes dissolving metal gallium materials with the purity higher than 99.99% in acid and preparing clear gallium salt solution; adding precipitants into the clear gallium salt solution to generate precipitates; washing, filtering, drying and calcining the obtained precipitates to obtain the mono-disperse ultrafine gallium oxide powder; carrying out compression molding and cold isostatic pressing strengthening on the synthesized mono-disperse gallium oxide powder to obtain gallium oxide green bodies; sintering the green bodies in high-temperature furnaces to obtain the high-density gallium oxide ceramic targets with uniform microscopic structures. The mono-disperse gallium oxide powder and the method have the advantages of simple process, convenience in operation, high yield, applicability to industrial production and the like.

The invention provides a reduction control device and method for N2O produced in the denitrification dephosphorization process and belongs to the technical fields of automatic control of an activated sludge process treatment system and wastewater biological denitrification dephosphorization by means of a sequencing batch reactor (SBR) process. Aiming at solving the technical problem that sodium nitrite adopted to serve as an electron acceptor produces N2O in the denitrification dephosphorization process in the existing SBR process, the device uses an SBR as a main body and comprises a water distribution tank, a peristaltic pump, a magnetic stirring apparatus, an acid adding system, an alkali adding system, an on-line control system connected with a computer and a N2O on-line detecting system. The on-line control system is connected with a water inlet peristaltic pump, a mud discharging system, the acid adding system, the alkali adding system, a temperature control device, the stirring apparatus, a drain valve, a relay on a magnetic valve of a nitrogen aerating system, an oxidation reduction potential (ORP) sensor, a pH sensor and a dissolved oxygen sensor. The N2O on-line detecting system is connected with a N2O microelectrode. The whole process is automatically finished through a programmable logic controller (PLC) of the computer, and the N2O on-line detecting system performs quantitative analysis to the nitrogen conversion condition to confirm dominant mechanism and influencing factors for the N2O production in the denitrification dephosphorization process.

The present invention relates to a method for determining the optimal parameters of the thermal oil spraying and heating process of the oil storage tank, which includes: determining the decision variable according to the factors that affect the thermal oil spraying and heating effect of the oil storage tank in the actual production process; obtaining different The measured data of the thermal oil spraying heating process in the experimental storage tank under the parameters, the field synergy angle, uniformity, heating efficiency and average heating rate are used as indicators to evaluate the heating effect, the weights of each indicator are determined, and the objective function is calculated; through Decision variable and objective function establish a support vector machine model; based on the support vector machine model, an initial population of size M is generated, and a genetic algorithm is used to optimize the objective function; the optimized variables are used as experimental parameters for indoor simulation experiments to obtain the corresponding objective function , the error with the result of the support vector machine exceeds a certain range, then repeat the iteration until the error is less than a certain range. The invention can find the optimal process parameters, which ensures the calculation accuracy to a great extent.

The invention discloses a method for producing metallurgy-grade alumina by taking pulverized fuel ash and recycled ammonium salt as raw materials. The method comprises the following steps: (1) preparing materials; (2) roasting; (3) dissolving; (4) crystallizing; (5) carrying out a liquid-solid ammonolysis reaction; (6) grinding and removing sulfur; and (7) performing low-temperature Bayer aluminum production. The method disclosed by the invention has the advantages that an aluminum salt ammonolysis method suitable for strong acid and weak base is adopted, namely liquid-solid or gas-solid ammonolysis is performed, the production efficiency is improved by over 60 percent compared with that a liquid-liquid ammonolysis method, the process conditions of the ammonolysis method are optimized, optimal process parameters are determined, the obtained product, namely crude aluminum hydroxide, is easy to filter and wash, the model selection of equipment is simple, and industrial mass production can be realized.

The invention discloses a method for preparing a SERS substrate of a silver nanometer / copper foam material. Firstly, immerse the cleaned and dried small pieces of foam copper with appropriate specifications in dilute hydrochloric acid solution for a period of time, and then successively wash them with absolute ethanol, deionized Rinse the foamed copper sheet with water, then immerse the processed foamed copper sheet in the mixed solution of silver nitrate solution and PVP solution prepared in advance to shake, rinse the foamed copper sheet with absolute ethanol and deionized water again, and put it in a vacuum It is fully dried in a drying oven, and the silver nano / copper foam substrate can be obtained after drying. The SERS substrate of the silver nanometer / copper foam material prepared by the invention has the advantages of cheap materials, simple preparation method, strong stability, storage resistance, and high sensitivity in Raman detection.

The invention belongs to the technical field related to laser welding, and discloses a process parameter optimization method and system for suppressing pores in laser stir welding. The method includes: S1, obtaining the backward chord length, forward chord length, forward step length and average The relationship between energy density and welding process parameters, the distance between the laser motion trajectory and the two adjacent intersection points of the weld center in the laser stir welding process is the chord length; S2, establish the backward chord length, forward chord length, forward step length and average The optimization constraints of energy density; S3, obtaining the preset range of process parameters; S4, substituting the process parameter values ​​within the preset range into the optimization constraints of backward chord length, forward chord length, forward step length and average energy density , then the process parameter combination that satisfies the optimization constraints of backward chord length, forward chord length, forward step length and average energy density at the same time is the optimized process parameter. This application optimizes the welding process parameters to achieve welding with large melting depth and few pores.