59results about How to "Good repeatability" patented technology

The invention provides a pretreatment method of a failure lithium ion battery positive electrode. The pretreatment method comprises the following steps: S1, weighing a lithium salt, and adding water to prepare a lithium salt solution with a concentration of greater than or equal to 0.1 mol/L, wherein the lithium salt is an inorganic lithium salt; S2, testing the lithium deficiency ratio x of a failure positive electrode material, and mixing the lithium salt solution obtained in the S1 and the failure positive electrode material to obtain a mixture, wherein the molar ratio of the lithium in thelithium salt solution to the positive electrode material is greater than or equal to the lithium deficiency ratio x of the failure positive electrode material; S3, carrying out a hydrothermal reaction on the mixture obtained in the S2 in a high-pressure hydrothermal kettle, and monitoring the Li<+> concentration of the mixture in the kettle until the concentration is not continuously reduced so as to complete the reaction, wherein the hydrothermal reaction temperature is greater than or equal to 100 DEG C; and S4, cooling, filtering to remove the solvent, washing with water to remove the residual lithium salt, and drying to obtain the lithium-supplementing positive electrode material. The method provided by the invention can improve the regeneration efficiency and performance index of therecycled material, has good repeatability, high resource utilization rate and simple and efficient process, and has high social and economic values.

The invention discloses a method for mouse spermatogonial stem cell reprogramming and application. According to the method, gene expression of mouse spermatogonial stem cells Tet3 is knocked down through an RNA interference technology, and the result shows that expression of pleuripotent factors is promoted; and then, when reprogramming induction is conducted, the result shows that the number of the obtained pleuripotent stem cells is remarkably increased. A set of mouse spermatogonial stem cell efficient reprogramming feasible scheme is established, through the scheme, mouse spermatogonial stem cell efficient reprogramming can be achieved, the needed time is short, operation is easy, repeatability is good, the success rate is high, the effect can be achieved without specialized conditions, the time and test materials are saved greatly, and compared with mouse spermatogonial stem cell reprogramming induction schemes in the past, the obvious advantages are achieved.

The invention discloses a conversion rate detection method for generating magnesium hydroxide from magnesium oxide. The method comprises the following steps: (1) preparing a standard sample, mixing raw material magnesium oxide and standard magnesium hydroxide by adopting absolute ethyl alcohol as a solvent, stirring, filtering and drying in vacuum to obtain a batch of mixed standard sample with different magnesium hydroxide contents, and calculating a conversion rate of the mixed standard samples; (2) carrying out color difference detection on the mixed standard sample by adopting a colorimeter to obtain a group of L, a and b; (3) obtaining whiteness of the data according to a whiteness calculation formula; (4) performing linear fitting on the whiteness and the conversion rate of the mixedstandard sample to obtain a linear fitting equation; and (5) during detection, carrying out random sampling on site, testing and calculating the whiteness by adopting the colorimeter, and substituting the whiteness into the linear fitting equation to obtain the conversion rate. In the invention, test cost, operation difficulty and test time are greatly reduced, and on-site large-batch real-time rapid detection is facilitated.

The invention discloses a heat storage material for a process for preparing propylene through catalytic dehydrogenation of propane and a preparation method of the heat storage material.The heat storage material is a supported composite metal oxide xMaOb/carrier, M is one or more of Ba, Mg, Mn, Zr, Ca, Ce, Bi, Cu, Co, Mo, Fe, Ni, Na, Nb and Sb, a is equal to 1-3, b is equal to 1-3, x is the loading amount of the composite metal oxide, and the value of x is 10-30 wt%. The synthesized heat storage material is mixed with a catalyst to be used in a reaction process for preparing propylene through the catalytic dehydrogenation of the propane, and thus, the selectivity can be improved under the condition that the conversion rate of the catalyst is not changed, heat is released in a reduction stage and an air regeneration stage, and bed temperature distribution is more uniform; and the heat storage material is expected to prolong the service life of the catalyst in industrial application reduce regenerated air inlet temperature or regenerated air flow and reduce energy consumption of a device.

An impact response hammer of high acceleration in piston type for impact testing table consists of a rigid hard impact hammer with the first impact surface , a rigid hard response head with the second impact surface , piston structure formed by placing response head in erection hole seat , an elastic support structure to float response head relatively up from hole seat and a buffer structure for rebounding up response head . The opposite direction clash impact of response head and impact hammer can produce peak acceleration of 70000 g.

The invention relates to equipment for performing modified treatment on medium and large particle seeds by using cold plasma. The equipment comprises a charging barrel, a discharging barrel, and a vacuum cavity connected with the charging barrel and the discharging barrel, wherein an air exhaust is formed in the vacuum cavity and is connected with a mechanical pump; a discharge treatment device and a transfer device are arranged in the vacuum cavity; the discharge treatment device comprises two polar plates arranged in parallel and a discharge treatment radio-frequency power supply connected with the two polar plates; the distance between the two polar plates is 30-40mm; a preionization device is arranged in the vacuum cavity and comprises an electrode and a preionization radio-frequency power supply connected with the electrode; and the vacuum cavity is connected with an earth phase. According to the equipment disclosed by the invention, the preionization device is arranged in the vacuum cavity, so that the working power supply can instantaneously build up luminance, and the time needed by processing is accurately controlled; with the adoption of ionization dust removal, the working space is clean; and moreover, large-scale treatment of medium and large particle seeds with the particle size of more than 15mm can be realized under the condition that the mature process parameters are guaranteed.

The invention discloses an establishment method of an HPLC fingerprint for disinfection powder oral liquid. The method comprises the steps of preparing a test solution, determining HPLC chromatographic conditions and preparing the HPLC fingerprint. The chromatographic conditions are that a chromatographic column is elit C18 chromatographic column (4.6*250nm, 5mu m); a mobile phase is methanol-acetonitrile-0.05 percent of phosphoric acid solution; gradient elution is performed; detection wavelengths are 250nm and 280nm; the flow velocity is 1.0mL.min<-1>; the column temperature is 30DEG C. Thefingerprint detection method for the disinfection powder oral liquid, established in the invention, has the advantages of good reproducibility, high stability, more obtained characteristic peaks and capability of carrying out comprehensive evaluation and quality control on the quality of the disinfection powder oral liquid.

The invention discloses a method for accurately determining thickness of tobacco leaf sample, which is characterized by measuring thickness of tobacco leaf by means of determining volume of a certain area of tobacco leaf. The method comprises the following specific steps of: A, punching hole on a tobacco leaf sample for sampling, and calculating the punched acreage; B, processing the sample; C, determining volume of the sample by drainage; D, calculating thickness of the tobacco leaf. The method provided by the invention overcomes error interference on determination of single sample caused by manual operation; compared with the existing determination method, the method has the following advantages: (1) sampling range is wide, and representativeness is strong; (2) the obtained sample is processed integrally, volume of the sample is determined, error caused by single determination is reduced, and accuracy is higher; (3) operation process of the method is easy to control, result stability is high, and repeatability is excellent.

The invention discloses a siloxane-based dynamic cross-linking agent and application thereof. The structural formula is as shown in the specification. The siloxane-based dynamic cross-linking agent disclosed by the invention can generate hydrogen-bond interaction through phenylboronic acid of the dynamic cross-linking agent and reactive hydrogen of parahelium in an amide group, and a dynamic cross-linking process of a polymer material can be effectively realized.

The invention discloses a method for measuring the content of sodium pyrophosphate in a food additive through adopting a potentiometric titration method. The method comprises the specific steps as follows: (1) sample processing: measuring about 1.2 g of a sodium pyrophosphate primary standard substance and a sample respectively, dissolving in a 100 ml beaker under room temperature, transferring the dissolved solution into a 500 ml volumetric flask, diluting and uniformly shaking; (2) sodium pyrophosphate measuring: transferring 50.0 ml of the solution obtained from step (1) into a 100 ml beaker by a transfer pipet, stirring and titrating a 0.1 mol/L silver nitrate standard solution, drawing a titration curve, ceasing the titration when the first derivative of the titration curve reaches a peak value, recoding the consumed volume of the silver nitrate standard solution at the peak value of the titration curve, calculating the content of the sodium pyrophosphate in the food additive. According to the potentiometric titration method, an indicator electrode refers to an Ag electrode, the terminal point is determined according to the peak value of the first derivative of the titration curve, the accuracy of testing data is improved and the personal errors of the titration experiment are reduced; the method has the advantages of simple steps, short analysis time and good repeatability, and no complicated pre-treatment to the sample is required.

The invention relates to the field of organic luminescent materials, and concretely relates to an organic luminescent compound, a preparation method thereof, and an organic electroluminescent device containing the compound. Introduction of arylamine makes the organic luminescent compound have hole injection ability/transport ability, a high power efficiency and a long life; and a suitable glass transition temperature is obtained by introducing a heterocycle in order to obtain the high-quality organic electroluminescent material. The organic electroluminescent device produced from the organic luminescent compound has an excellent current efficiency, an excellent power efficiency and a long life. The preparation method of the organic luminescent compound has the advantages of good repeatability and high yield.

The invention belongs to the technical field of veterinary drug residue detection, and particularly relates to a method for monitoring whether florfenicol residue in pre-slaughter pork pig tissue exceeds the standard or not. According to the method, the method comprises the steps of: detecting the content of florfenicol residual markers in the in-vivo tissues (muscles, livers, kidneys and lungs) and urine of pork pigs mixed and fed with florfenicol powder by adopting a liquid chromatography-tandem mass spectrometry method; analyzing the residue elimination condition of the florfenicol residue marker in pig body tissues and urine and the correlation between the florfenicol residue marker in body fluid and the residual quantity of each tissue, predicting the content range of the florfenicol residue marker in the urine when the withdrawal period is reached, and when the content of the florfenicol residue marker in the urine is lower than 45 [mu]g.L <-1>, enabling the residual quantity of the florfenicol residual marker in 99% of the in-vivo tissue of the pork pig to be lower than the maximum residual limit, and therefore, a simple and economical pre-slaughter monitoring method is provided for the florfenicol residual in the pork pig.

The invention discloses an on-line rapid detection method of stevioside, comprising the following steps of: preparing an ammonium ceric sulfate solution (Ce(IV)), a Na2SO3 solution, a stevioside standard solution and a sample stevioside solution; respectively mixing the above Na2SO3 solution and the stevioside standard solution in a three-way valve by a driving pump via a corresponding pipeline at the flow speed of 30-60 r/min, and inputting the mixed solution into a chemical luminescence analytical device of flow injection; letting the ammonium ceric sulfate solution flow through a sixteen-way valve at the flow speed of 50-80 r/min by an auxiliary pump for the injection detection time of 5-15 seconds after a baseline becomes stable, letting each solution mix and flow into a flow-through cell to detect the chemiluminescence intensity of the mixed solution, recording data, and making a standard curvilinear equation; repeating the above operation, testing the chemiluminescence intensity of the sample stevioside, substituting into the standard curvilinear equation, and calculating the content of the sample stevioside. The detection method provided by the invention is simple, requires low detection cost, can be used for on-line routine detection, and is applicable to industrial or agricultural production.

The invention relates to a method for preparing mesoporous silicon dioxide nano-particles with novel bell structures. The method includes dissolving anionic block copolymers polystyrene-b-polyacrylic acid in tetrahydrofuran; dissolving hexadecyl trimethyl ammonium bromide in water and then adding ammonia water into the water; dissolving tetraethyl orthosilicate in ethyl alcohol; pouring tetrahydrofuran solution with block copolymers into ammonia water solution with surfactants under stirring conditions to form mixed solution; pouring the mixed solution into alcoholic solution with inorganic silicon sources and carrying out separation to obtain organic-inorganic hybrid silicon dioxide nano-particle precursors; dispersing the organic-inorganic hybrid silicon dioxide nano-particle precursors in mixed solution with ethyl alcohol and concentrated hydrochloric acid, carrying out extraction and then carrying out separation to obtain the organic-inorganic hybrid mesoporous silicon dioxide nano-particles with the bell structures. The method has the advantages that hydrophilic medicine molecules and hydrophobic medicine molecules can be simultaneously supported by the mesoporous silicon dioxide nano-particles with the novel bell structures; procedures for preparing the mesoporous silicon dioxide nano-particles are simple and are high in efficiency and good in repeatability.

The invention discloses a method for determining the content of impurities contained in etamsylate medicine and the content of main medicine thereof. a chromatographic column taking octadecylsilane chemically bonded silica as a filler is adopted, a tetrabutylammonium hydroxide aqueous solution as a mobile phase A and methanol as a mobile phase B to carry out gradient elution. All impurities of etamsylate can be rapidly and effectively separated, an effective detection method is provided for monitoring etamsylate and medicines thereof, and the product quality and the medication safety of etamsylate are ensured; a self-control method is adopted for quantitative determination of impurities, an external standard method is adopted for determination of genotoxic impurities and the main medicinecontent, operation is easy and convenient, the detection cost is low, good sensitivity, linearity, specificity, precision, accuracy, stability and durability are achieved, and the method is an effective detection method for controlling etamsylate and the medicine of etamsylate.

The invention discloses a construction method and device for a depression-induced breast cancer animal model and application. The construction method comprises the following steps that a mouse is placed in a constraining device not to act, the mouse is constrained for 4 hours every day, light-dark circulation is maintained for 12 hours for 3 weeks or more, and constructing is carried out to obtain the spontaneous breast cancer transgenic mouse depressive disorder animal model with depressive disorder related phenotypes. The invention further discloses a constraint device of the animal model. The animal model is used for simulating the human breast cancer and depression process and screening diagnosis and treatment drugs or therapies. The animal model has the advantages of good repeatability, small individual difference, short modeling time, low animal death rate and the like, and can be widely applied to simulation of human depression-induced breast cancer and related disease pathology and screening and curative effect verification of diagnosis and treatment substances.

The invention discloses primers for detecting bovine ephemeral fever virus and a kit which is composed of the primers and is used for detecting the bovine ephemeral fever virus. The primers for detecting bovine ephemeral fever virus disclosed by the invention are as shown in SEQ ID No. 1, SEQ ID No. 2, SEQ ID No. 3 and SEQ ID No. 4. The kit for detecting the bovine ephemeral fever virus disclosed by the invention comprises the four primers. The primers disclosed by the invention can be effectively matched with the reported bovine ephemeral fever virus G gene. The detection kit disclosed by the invention is more beneficial to the detection for the bovine ephemeral fever virus.