63results about How to "The method is simple and economical" patented technology

The invention provides a preparing method for a high-activity and high-stability composite catalyst for fuel cells and belongs to the technical field of fuel cells. The preparing method includes the steps that firstly, the surface of a Pt / C catalyst is wrapped by a layer of dopamine, and the dopamine is used for adsorbing a metal precursor through the good adsorbing performance on metal cations; secondly, silicon dioxide is used for packaging a polymer, the pyrolysis losses and heat treatment morphology conversion of a polymer precursor are controlled through morphology fixing and range limiting functions of the silicon dioxide, alloy nano particles and an N-doped carbon modified layer are further synthesized through high-temperature pyrolysis under the surface segregation effect of platinum and transition metal, and the low-platinum-nonmetal composite structure catalyst with the hollow alloy nano particles wrapped by N-doped carbon is constructed. According to the preparing method for the high-activity and high-stability composite catalyst for the fuel cells, migration agglomerating and growing in the sintering process of the catalyst are overcome, the size of the particles is effectively controlled, the catalyst has high high-activity surface area, operation is simple, industrial production is easy, and the catalyst can be widely applied to the fuel cells with proton exchange membranes serving as electrolytes.

The present invention provides a catalyst comprising a composite of a heteropolyacid impregnated on a support for the synthesis of 2- and 4-picolines and a process for the preparation thereof and use thereof for the synthesis of 2- and 4-picolines.

The invention discloses a multi-scale helical structure fiber bundle and a preparation method thereof. Through an electrospinning technique and a twisting and multistrand overtwist method, the preparation method of the multi-scale helical structure fiber bundle succeeds in preparing a series of multi-scale helical structure fiber bundles. The multi-scale helical structure fiber bundles can compound varied materials and integrate varied functions and have excellent intensity, flexibility, stretchability and resilience. Moreover, the diameter and length of the fiber bundles can be controlled, and the fiber bundles can be randomly bent and weaved and have broad application.

The invention relates to a method for producing a micromechanical component (300) that comprises providing a first substrate (100), forming a microstructure (150) on the first substrate (100), wherein the microstructure (150) comprises a moving function element (151), providing a second substrate (200), and forming in the second substrate (200) an electrode (251) for capacitively measuring a deflection of the function element (151). The method further comprises connecting the first and the second substrates (100; 200), wherein a closed cavity which encloses the function element (151) is formed, and wherein the electrode (251) adjoins the cavity in an area of the function element (151).

The invention discloses a lachnum exopolysaccharides carboxymethylation derivative and an application thereof in preparation of chronic renal failure-resistant medicines. The lachnum exopolysaccharides carboxymethylation derivative is characterized in that lachnum exopolysaccharides with the strain collection number of CCTCC No: M 2011196 are subjected to chloroacetic acid carboxymethylation modification to obtain the lachnum exopolysaccharides carboxymethylation derivative, and the lachnum exopolysaccharides carboxymethylation derivative in an effective dose and medical auxiliary materials are prepared into tablets and capsules for clinical use according to a conventional preparation method in pharmaceutics due to the effect of obviously resisting chronic renal failure. The pharmacodynamic experiment proves that the exopolysaccharides and carboxymethylation derivative has an obvious effect of resisting chronic renal failure and does not have a toxic or side effect, and the preparation method is simple and economic.

The invention discloses a water-soluble lachnum melanin and an application thereof in preparation of lead-removing promoting medicines. The water-soluble lachnum melanin is characterized by being prepared by modifying the intracellular melanin produced by the lachnum with the strain preservation number of CCTCC No:M2011054 via chloroacetic acid. According to the pharmacological action experiment for promotion of lead removal from a rat infected with the lead, the result shows that the water-soluble lachnum melanin has an obvious lead-removing promoting function and cannot generate toxic and side effects, so that the side effect defects that certain essential elements such as Zn, Cu, Fe and the like in vivo are lost and certain organs are damaged, which are caused by the existing western medicine during the lead removing, are overcome. Thus, the lead-removing promoting function of the water-soluble lachnum melanin is ensured. The method disclosed by the invention is simple and economical. The water-soluble lachnum melanin can be applied to the preparation of the tablet-type or capsule-type lead-removing promoting medicines for oral administration.

The invention provides a method for determining rare earth elements in a super-based rock by ICP-MS. The method comprises the following steps: accurately weighing a powder sample and putting the powder sample into a sample dissolving bomb; adding high-purity nitric acid and high-purity hydrofluoric acid in sequence; putting the sample dissolving bomb into a steel sleeve, screwing and putting the sample dissolving bomb into a drying oven for heating; after the sample dissolving bomb is cooled and the cover is opened, putting the sample dissolving bomb on an electric heating plate and evaporating to dryness; adding nitric acid and evaporating to dryness again; adding high-purity nitric acid and ultrapure water; putting the sample dissolving bomb into the steel sleeve, screwing and putting the sample dissolving bomb into the drying oven for heating; putting the sample dissolving bomb on the electric heating plate and evaporating to dryness; adding hydrochloric acid and evaporating to dryness again; adding hydrochloric acid and dissolving; centrifuging the sample by utilizing a centrifugal machine; taking supernatant and putting the supernatant on a column; adding hydrochloric acid towash the column and adding hydrochloric acid to connect the sample; after evaporating the sample to dryness, adding nitric acid; after evaporating to dryness again, adding nitric acid and fixing the volume; finally, determining the content of the rare earth elements in the sample by ICP-MS. According to the method provided by the invention, the ultralow-low-content rare earth elements in the super-based rock can be effectively detected; an obtained rare earth partition curve is smooth in distribution and a detection result is accurate and reliable.

The invention relates to a method for the production of L-carnitine, wherein a [beta] -lactone, which is a 4-(halomethyl)oxetane-2-one, is converted into carnitine with trimethylamine (TMA), wherein the [beta] -lactone is not subjected to a basic hydrolysis step before being contacted with the trimethylamine. The invention also relates to a carnitine having a unique impurity profile.

The invention relates to a preparation method and application of hypoglycemic Chinese hickory leaf total flavonoids; the Chinese hickory leaf total flavonoids exhibit good hypoglycemic effect at all doses, have significant effect for diabetes mellitus, and are applicable to the preparation of drugs, health foods and the like for preventing or treating diabetes mellitus.

The invention relates to the technical field of organic synthesis, in particular to a synthetic method for thioetherification and thiocarbonylation of halogenated alkane. According to the method, a 3-methylthiopropionic acid methyl ester derivative is used as a vulcanizing reagent to realize thioetherification and thiocarbonylation of halogenated alkane; IPrCuCl is used as a catalyst to realize thioetherification; in the presence of carbon monoxide, IPrCuCl and bis-salicylamide ethyl cobalt are used for co-catalysis to obtain thioester; and the vulcanizing reagent is easy to synthesize, mild in reaction condition and high in practicability. According to the invention, thiol with strong smell, high toxicity and environmental pollution is not used, good functional group tolerance and excellent yield and purity are achieved, harsh reaction conditions are not needed, and the method is suitable for industrial production.

The invention discloses a preparation method of environment-friendly CI disperse orange 29, which belongs to the technical field of disperse dyes. The preparation method comprises: stirring and dispersing the dye filter cake of untreated CI disperse orange 29 in water into a slurry; At ‑100°C, use sodium hydroxide and / or sodium carbonate to adjust the pH to greater than 9, and then use sulfuric acid and / or hydrochloric acid to adjust the pH to 7‑9; then filter and separate, and wash the filter cake with water until the pH is neutral; the separated environmental protection Type CI Disperse Orange 29 filter cake, through sanding, coloring, drying commercial processing of disperse dyes, the finished dye product of CI Disperse Orange 29 which is environmentally friendly can be obtained. The method of the present invention is simple and economical, and can limit the detectable anthranilic ether in the dye product of CI Disperse Orange 29 to below 150ppm, which meets the national standard; thus the dyed textile meets the EU standard.

The invention discloses a two-line sterile line propagating method for rice in a high mountain region. The two-line sterile line propagating method for the rice in the high mountain region comprises the following steps: a, performing field transforming; b, performing seed treatment; c, sowing; d, transplanting in the same field; e, performing fertilizer management; f, performing water management;and g, performing disease and insect prevention and control. The method is simple and economic; the propagating of dual purpose genic male sterile lines of the rice is performed successfully in the mode of regulating and controlling the development of a sterile line during growth duration through cold spring serially irrigating and cultivating technologies; and the two-line sterile line propagating method for the rice in the high mountain region has the advantages of low economical cost, simple technology and high operability.

The invention discloses a multi-scale helical structure fiber bundle and a preparation method thereof. Through an electrospinning technique and a twisting and multistrand overtwist method, the preparation method of the multi-scale helical structure fiber bundle succeeds in preparing a series of multi-scale helical structure fiber bundles. The multi-scale helical structure fiber bundles can compound varied materials and integrate varied functions and have excellent intensity, flexibility, stretchability and resilience. Moreover, the diameter and length of the fiber bundles can be controlled, and the fiber bundles can be randomly bent and weaved and have broad application.

The invention provides a method for producing a ceramic die core. The method comprises the following steps of (1) producing a ceramic die core blank; (2) pre-treating a filler for the shaping of the ceramic die core, specifically adding the filler to be treated into a nonmetal material hopper with de-ionized water, continuously stirring slurry obtained by mixing powder and de-ionized water, continuously dropwise adding analytically pure hydrochloric acid to adjust the pH value of the slurry to 4 to 6, stopping adding analytically pure hydrochloric acid when the pH value is changed by less than or equal to 0.2 within 5 minutes, continuing stirring the slurry for 10 to 60 minutes, standing and settling the slurry for 4 to 12 hours, pouring an upper-layer solution, washing settled powder for 1 to 3 times by using de-ionized water until the pH value of an obtained solution is 6 to 8, drying the powder finally sinking to the bottom at 100 to 140 DEG C, calcining the powder for 4 to 6 hours at 1200 to 1500 DEG C, and crushing and sieving the powder; (3) performing shaping calcination; (4) performing reinforcement reconditioning. The method is simple, economical and low in time consumption, manpower is saved, energy consumption is eliminated, the production efficiency of the ceramic die core is greatly improved, and the quality of the ceramic die core is improved.

The invention relates to a construction method for a large-span cast-in-situ beam slab support system of a plant, which is characterized in that a middle part and an upper part of a shear wall are respectively buried with I-shaped steel to stretch over a room, and a pull ring 9 is welded on the one-third, a cross part, of the middle I-shaped steel 1 for obliquely drawing a steel wire rope 7 between wall bodies, a roof full scaffold is supported on two layers of the I-shaped steel 1 to unload the I-shaped steel 1 through obliquely drawing the I-shaped steel 1 and the steel wire rope 7 between the shear walls with a turnbuckle 8, and the forced deformation of the support system is measured and controlled by measuring the deformation of the I-shaped steel 1 in the concrete casting and loading process. The embodiment scheme of the construction method is that the settlement deformation of the I-shaped steel 1 in different loading stages can be measured through a leveling instrument in the process of the concrete casting and loading process, if the deformation exceeds a preset limit value, the I-shaped steel is unloaded through fastening the turnbuckle 8 to strain the steel wire rope 7,so as to prevent the deformation from exceeding the preset limit value, and the loading deformation value of the support system can be continuously kept in the limit value range through circulating operation, thereby achieving the effective measureable and controllable effect.

The invention discloses a lachnum exopolysaccharides carboxymethylation derivative and an application thereof in preparation of chronic renal failure-resistant medicines. The lachnum exopolysaccharides carboxymethylation derivative is characterized in that lachnum exopolysaccharides with the strain collection number of CCTCC No: M 2011196 are subjected to chloroacetic acid carboxymethylation modification to obtain the lachnum exopolysaccharides carboxymethylation derivative, and the lachnum exopolysaccharides carboxymethylation derivative in an effective dose and medical auxiliary materials are prepared into tablets and capsules for clinical use according to a conventional preparation method in pharmaceutics due to the effect of obviously resisting chronic renal failure. The pharmacodynamic experiment proves that the exopolysaccharides and carboxymethylation derivative has an obvious effect of resisting chronic renal failure and does not have a toxic or side effect, and the preparation method is simple and economic.

The present invention relates to the technical field of organic synthesis, in particular to a synthetic method for thioetherification and thiocarbonylation of halogenated alkanes; using methyl 3-methylthiopropionate derivatives as vulcanizing agents to realize the thioetherification and thiocarbonylation of halogenated alkanes Thiocarbonylation: Use IPrCuCl as a catalyst to realize thioetherification; in the presence of carbon monoxide, use IPrCuCl and bis-salicylamide ethyl cobalt to co-catalyze to obtain thioesters. The vulcanization reagent is easy to synthesize, the reaction conditions are relatively mild, and the practicability is strong. The invention avoids the use of mercaptans with strong odor, high toxicity and environmental pollution, has good functional group tolerance, excellent yield and purity, does not require harsh reaction conditions, and is suitable for industrial production.

The invention provides a heteropolyacid complex impregnated on a support, a catalyst for synthesizing 2-picoline and 4-picoline, a preparation method thereof, and a catalyst for synthesizing 2-picoline and 4-methylpyridine The use of pyridine.