2281results about How to "Simple preparation steps" patented technology

The invention relates to a carbon supported catalyst for ozone oxidation, and a preparation method and a use thereof. The carbon supported catalyst is composed of an active carbon supported Fe, Cu, Ni or Mg transition metal active component and a Ce, La or K cocatalyst. The catalyst has a very high catalysis activity against non-degradable organic wastewater, allows the COD removal rate to reach above 55% and the biodegradability of the wastewater to be improved to above 0.30, has the advantages of long service life, simple preparation, no secondary pollution, containing of no precious metals, and low production cost, and is very suitable for the use in the industrialized production.

The invention relates to a tungsten oxide nano-wire ammonia-sensitive sensor and a preparation method thereof, belonging to the gas sensor technical field. The method comprises the following steps that: sodium tungstate is dissolved in deionized water to prepare a sodium tungstate solution; a hydrochloric acid and an oxalic acid are dripped slowly and stirred; a flaxen micellar solution is transferred into a reaction kettle, added with 25 to 30 grams of potassium sulfate and uniformly stirred, and the mixture undergoes hydrothermal treatment for 12 to 144 hours at a temperature of 180 DEG C; hydrothermal products are washed and fully dried in the presence of air with a temperature of 65 DEG C, and then a tungsten oxide nano-wire is prepared; adhesives and frit are added according to the tungsten oxide nano-wire prepared to prepare gas-sensitive materials slurry; and then the tungsten oxide nano-wire ammonia-sensitive sensor is prepared after element sintering and ageing. The method has simple steps, easily controlled parameters, and low energy consumption during the whole preparation process; the tungsten oxide nano-wire prepared has a large specific surface area; and the tungsten oxide nano-wire ammonia-sensitive sensor prepared has high sensitivity on low-concentration ammonia (between 1 and 100 pars per million), good repeatability and high stability.

The invention discloses electrocatalyst of MOFs (Metal-organic Frameworks) / graphene composite carrier and a preparation method of the electrocatalyst. The electrocatalyst is composed of the MOFs / graphene composite carrier and an active component. The preparation method of the MOFs / graphene composite carrier comprises the following steps of: preparing MOFs / graphene composite carrier through a hydrothermal reaction method; and loading the active component on the composite carrier by adopting a microwave synthesis method. The preparation method disclosed by the invention is simple in preparation steps, short in time and small in product loss; and the prepared catalyst is small in grain size, unlikely to cluster, uniformly distributed and high in electrochemical catalytic activity.

The invention discloses a dynamic polymer material. The dynamic polymer material comprises a product obtained through reaction of the following components: at least one polyol compound containing two or more 1,2-diol motifs or 1,3-diol motifs as well as at least one phenylboronic acid compound containing two or more phenylboronic acid motifs provided with aminomethyl groups in ortho-positions. Dynamic reversible phenylborate bonds are formed through the reaction of the components and then constitute a dynamic cross-linked polymer. The polymer material has reusability and recoverability because of the dynamic reversibility of the special phenylborate bonds; besides, when the polymer material adopting a specific formula receives external force, dynamic bonds break preferentially to have energy dissipation and stress elimination functions, so that the material has good toughness. The material has broad application prospect in the fields of military space equipment, functional paint and coatings, biomimetic materials, biomedical materials and the like.

The present invention discloses a preparation method of a simple, low-cost, multi-channel microfluidic chemiluminescent paper chip and an on-site detection method by using the same. By using a full print mode, a plurality of multi-channel microfluidic chemiluminescent paper chips are printed out on a common A4-size filter paper in batch. The printing process includes: printing hydrophobic wax patterns in batch; melting wax for molding; printing chemiluminescent reagent ink patterns in batch; printing oxidase ink pattern in batch; cutting the microfluidic chemiluminescent paper chips into certain shape; and performing plastic package to the prepared microfluidic chemiluminescent paper chips. An on-site detection method by using the microfluidic chemiluminescent paper chip comprises the steps of: placing the plastic packaged microfluidic chemiluminescent paper chip into the cartridge of a handheld luminescent detector; dropwise adding a sample solution into the sample region; then covering the cartridge with a lid, and starting the test. The existence and contents of glucose, polyphenols, xanthine, cholesterol, uric acid, and hemoglobin are sequentially determined via the size of six chemiluminescence peaks sequentially appearing.

The invention relates to a preparation method of ozone catalytic oxidation catalyst used for treating oil refining waste water. Amorphous aluminium oxide powder and ferric hydroxide powder are mixed by dry basis weight ratio of 100: 1-30, and rolling pelleting, maintaining, drying and roasting are carried out, thus obtaining the finished product catalyst. The method includes the following steps: (a) amorphous aluminium oxide and ferric hydroxide powder are mixed to be uniform; (b) the mixture is placed into a rotary pelleting machine, binder is sprayed, and rolling pelleting is carried out, the binder is sprayed in solution or colloid form in an atomizing way, and the amount of binder sprayed into the pelleting machine is 2-50% of total mass of amorphous aluminium oxide; and diameter of pelleting is controlled to be 1-8mm; (c) particle matter is maintained for 3-24 hours under the condition that temperature of water vapour is 100-110 DEG C; (d) catalyst is dried, drying temperature is 50-180 DEG C, drying time is 2-10 hours, and then roasting is carried out; and roasting temperature of catalyst is 400-600 DEG C, roasting time is 2-8 hours, and finished product catalyst is obtained.

The invention discloses a waterborne plastic-absorbing glue and a preparing method thereof. The waterborne plastic-absorbing glue is prepared from, by weight, 40-60 parts of aromatic aqueous polyurethane dispersion, 40-60 parts of ethylene-vinyl acetate emulsion, 0-10 parts of tackifying resin, 0.05-0.5 part of antifoaming agent, 0.1-1 part of wetting agent, and 0.1-1 part of thickening agent. The plastic-absorbing glue has excellent heat-resistant performance, pickup rate, bordure performance, low-temperature viscosity stability, and low activation temperature. The preparing method comprises the steps of adding aqueous polyurethane dispersion and ethylene-vinyl acetate emulsion into a high-speed dispersing kettle, then adding the tackifying resin, wetting agent, and antifoaming agent in sequence under a stirring condition, and finally adding the thickening agent to adjust the mixture into suitable viscosity to obtain the waterborne vacuum plastic-absorbing glue. According to the waterborne plastic-absorbing glue and the preparing method thereof, it is not necessary to adjust the pH of the ethylene-vinyl acetate emulsion in advance, and thus preparation procedures of traditional plastic-absorbing glue are simplified, and deslagging risks in the preparing process are lowered.

The invention relates to a method for preparing a tungsten oxide nano-wire and a tungsten oxide nano-wire ammonia-sensitive sensor, belonging to the one dimensional nano oxide material preparation and gas-sensitive technical field. The method comprises the following steps that: sodium tungstate is dissolved in deionized water to prepare a sodium tungstate solution; a hydrochloric acid is dripped slowly to prepare a flaxen micellar solution which is then centrifugally separated; products are uniformly dispersed in a potassium sulfate solution which is then transferred into a reaction kettle for hydrothermal reaction, and then the tungsten oxide nano-wire is prepared; adhesives and frit are added into the tungsten oxide nano-wire, and then the tungsten oxide nano-wire ammonia-sensitive sensor is prepared after element sintering and ageing. The method has simple steps, easily controlled technological parameters during the preparation process, and very low energy consumption during the whole preparation process; the tungsten oxide nano-wire prepared has a large specific surface area and high thermal stability; and the tungsten oxide nano-wire ammonia-sensitive sensor prepared has high sensitivity on low-concentration (between 1 and 100 pars per million) H2, CO and NH3, good repeatability and high stability.

Provided are an MXene-polydopamine composite material and a preparation method thereof. The composite material is formed by a two-dimensional transition metal carbide (nitride) MXene nanosheet obtained by stripping treatment and polydopamine coated on the surface of the MXene nanosheet. The mass ratio of the two-dimensional transition metal carbide (nitride) MXene nanosheet and the polydopamine is1:0.05-1:1. By means of reduction and encapsulation effects of the polydopamine, the polydopamine is coated on the surface of the two-dimensional transition metal carbide (nitride) MXene nanosheet obtained by the stripping treatment to improve the stability of the MXene nanosheet. At the same time, the support effect of the polydopamine is utilized to increase the interlayer spacing of the MXenenanosheet, and the MXene-polydopamine composite material with high stability and excellent ion and gas storage characteristic is obtained. The preparation steps are simple, and the material is suitable for mass production.

The invention relates to a catalyst for the preparation of isobutene by isobutene dehydrogenation as well as a preparation process and a dehydrogenation process thereof. In the catalyst, a heat-resistant oxide is used as a carrier, a platinum group metal element is used as a main catalyst, an IVA group metal element is used as a first assistant, an alkali metal element is used as a second assistant, and a halogen element is used as a modifier. The catalyst is prepared by loading a solution containing the active components onto the heat-resistant oxide carrier in one step by adopting an isopyknic immersion method, has higher isobutene conversion rate, better isobutene selectivity and favorable stability by using a mixture of hydrogen and water vapor as a diluent, and is suitable for the application in industrialized production.

The invention relates to a pyrro-quinoline quinine (PQQ) sodium salt derivative and a preparation method thereof, belonging to the field of pharmacy. In the preparation method, PQQ is used as a raw material, and an acid-base neutralization reaction with PQQ is carried out in a basic solvent of sodium hydroxide to prepare the PQQ sodium salt derivative represented in the structural formula (I), wherein R1, R2 and R3 can be identical or different and respectively represents H, ammonium ion (NH3), potassium ion, sodium ion, magnesium ion, calcium ion or zinc ion, and at least one of R1, R2 and R3 is sodium ion. The invention has mild reaction conditions, easy product refining and purification, simple preparation steps and high yield more than 80%. The PQQ sodium salt derivative has the functions of inhibiting GSK-3 activity, reducing senile pigment formation in a transgenic mouse brain, reducing tau protein phosphorylation and the like. Thus, the PQQ sodium salt derivative can be medically used for treating senile dementia and other diseases.

The present invention discloses a compressed wood preparation method and compressed wood prepared through the method. The method comprises: (1) carrying out first high-frequency heating on wood with a water content of 12-30 wt%, such that the wood material core temperature achieves 80-120 DEG C; (2) carrying out hot pressing on the wood obtained in the step (1); and (3) carrying out second high-frequency heating on the wood obtained in the step (2), such that the wood material core temperature achieves 180-220 DEG C. The compressed wood prepared by using the preparation method has characteristics of resilience resistance, simple steps, short required time, substantially-increased density, substantially-increased surface hardness, substantially-increased wear resistance, low water absorption recovery rate, and low moisture absorption recovery rate.

A Lundell type rotor core with a pair of side cores and a magnetic-pole cylindrical portion has a structure in which the magnetic-pole cylindrical portion is mated between both the side cores (also referred to as “pole cores”) in a radial direction at an outside of a field coil wound on a boss portion in the side cores. The magnetic-pole cylindrical portion is made of plural magnetic steel sheets laminated in the axis direction, and is easily deformed rather than both the side cores. The easy deformation characteristic of the magnetic-pole cylindrical portion prevents generation of a gap during the assembling process of the magnetic-pole cylindrical portion and the side cores. Without paying strict dimension control of the components for the rotor core, it is easily possible to prevent any generation of a gap between the side cores and the magnetic-pole cylindrical portion while assembling. It is thereby possible to prevent a deterioration of a magnetic flux flowing in the rotor core.

The invention provides a preparation method of a porous membrane, comprising the following steps: mixing and dispersing a polymer and solvent to prepare slurry; enabling the slurry to flow out of a narrow break joint to form a membrane in a gel tank; introducing the membrane to an extraction tank to carry out solvent replacement to form the porous membrane; and drying the porous membrane. The preparation method is simple in process, precise in control, low in cost and high process safety. The porous membrane prepared by using the preparation method can be widely applied to primary batteries, secondary batteries, electrochemical containers and the like.

The invention relates to a linear water-based polyurethane thickener containing hydrophobic side bases and a preparation method of the linear water-based polyurethane thickener. The preparation method is characterized in that 40 weight percent to 60 weight percent of dibasic alcohol polymers, 10 weight percent to 30 weight percent of diisocyanate and 0 weight percent to 5 weight percent of catalysts are mixed, under the condition of N2 gas existence and the temperature being 50 DEG C to 100 DEG C, the stirring is carried out for 1 to 6 hours, then, 10 weight percent to 30 weight percent of end-capping agents are added, under the condition of the temperature being 50 DEG C to 100 DEG C, the stirring is carried out for 1 to 6 hours, polyurethane prepolymers are prepared, then, 5 weight percent to 20 weight percent of chain extenders are added into the prepared polyurethane prepolymers, the stirring is carried out for 1 to 6 hours under the condition of the temperature being 50 DEG C to 100 DEG C, and the linear water-based polyurethane thickener containing hydrophobic side bases is prepared. The linear water-based polyurethane thickener and the preparation method have the characteristics that no solvent exists, the toxicity is low, the environment is protected, the preparation process is simple, and the like. The prepared linear water-based polyurethane thickener containing hydrophobic side bases is applicable to the thickening of water-based paint, and the obvious thickening effect is realized.

The invention discloses an additive capable for enhancing energy-conservation and emission-reduction of coals. The product is produced by mixing matrix material, active material and soda lime according to a proper ratio (calculated by weight percent) of 20-30 percent : 30-60 percent : 20-40 percent. The matrix material refers to one of or a mixture of several materials of zeolite molecular sieve, kaolin, bentonite and flyash. The active material consists of oxidant and catalyst. The soda lime is produced by adding industrial solution to limestone, mainly used for swelling and sulfur solidifying. The additive has eminent effect in improving energy conservation and energy efficiency, and capable to reduce emission of flue gas and other harmful gases. The additive is also characterized by simple production process, low cost, small dosage and user-friendly features.

The invention belongs to the technical field of the catalytic purification of environments, and provides a nanoflower spinel CoMn2O4 catalyst for the catalytic oxidation of VOCs (Volatile Organic Compounds), a preparation method and application thereof. Oxalic acid is used as a precipitator; the pinel CoMn2O4 catalyst is obtained by washing, drying and calcination. The CoMn2O4 catalyst prepared bythe preparation method exhibits that nanosheets form a nanoflower-shaped structure through self-assembly. Compared with oxides Co3O4 and MnOx, a mixed phase Co3O4 / MnOx and a spinel CoMn2O4 catalyst reported by current literature, the spinel CoMn2O4 catalyst prepared by the preparation method shows better activity and stability in removal of the VOCs, can reach 99 percent of the toluene removal rate at 220 DEG C, is used for realizing 100 percent conversion of formaldehyde at 90 DEG C, meanwhile, can have the acetone removal rate reaching 100 percent at 170 DEG C, and has a better industrial application prospect.

The invention provides a method for constructing a high-flux simplified genome sequencing library. The method comprises the following steps: digesting genome DNA of different samples by using restriction enzymes, thereby obtaining blunt-end DNA fragments with phosphorylation modification at the 5' end; adding the base A at the 3' end, connecting the DNA fragments of different samples with 5' phosphorylation and 3' cohesive ends A with joints containing different bar code sequences, connecting the products PCR, purifying and mixing the amplification products, performing low-cycle PCR amplification, thereby obtaining a target fragment amplification product of which the ratio of the joints to joint dimers is greatly reduced; and separating, purifying, and forming the high-flux simplified genome sequencing library from the purified products. The method disclosed by the invention has the advantages that the flux is high, the cost is low, and the generated library is high in sequencing quality and has very wide application prospects in researches such as high-flux SNP detection and marker development, genetic map drawing and functional gene location.

A high-effective catalyst used for removing indoor formaldehyde at normal temperature includes a carrier, a noble active component, and an additive. The carrier is a mesoporous oxide including at least one of Al2O3, TiO2, SiO2, cerium oxide, cobalt oxide and manganese oxide; the active component includes a less amount of at least one of noble metals Pd, Pt, Au and Ag; the additive is at least one of Na, K, Fe, Co, Ce and Ni. The catalyst can completely convert the formaldehyde into CO2 and H2O at normal temperature under relative humidity of 50-90%. The catalyst has high catalytic-oxidizing activity and strong anti-moisture capability and is suitable for removal of the formaldehyde in a sealed or a semi-sealed space.

The invention belongs to the technical field of preparation of one-dimensional metal oxide nano-materials and semiconductor gas sensors therefrom, in particular relates to orderly arranged In2O3 nanofibers and application of same in preparation of an ultra-fast response alcohol semiconductor sensor. The process for preparing the orderly arranged In2O3 nanofibers comprises the following steps of: preparing a precursor solution from soluble nitrate, high polymer materials and a solvent; preparing orderly arranged composite nanofibers with a magnetic-field-induced electrostatic spinning technology; and performing high-temperature sintering to remove an organic high polymer template and further obtain the orderly arranged In(NO3)3 nanofibers. The alcohol gas sensor prepared from the orderly arranged In(NO3)3 nanofibers and a planar alumina substrate structure has the advantages that: the response time of the alcohol gas sensor to alcohol gas at the working temperature of 275 DEG C is 0.4 s, and the recovery time is 3 s; and the reversibility and repeatability of the sensor are good and far superior to the traditional alcohol sensor made of nano-powder materials of the same type. In the invention, the advantages of simple process, low cost and high yield are achieved.

The invention discloses a method for producing an immediate complete or half denture based on a 3D printing technique. The method comprises the steps of preparing an impression with a remaining tooth jaw or a tooth-free jaw, transferring a jaw position relation, acquiring digital models of the remaining tooth jaw or the tooth-free jaw and the jaw position relation, setting the arrangement and the denture border of artificial teeth of the immediate complete or half denture corresponding to the form of the remaining tooth jaw or the tooth-free jaw and the jaw position relation, invoking data in a preset database, designing the artificial teeth and polishing surfaces of the artificial teeth, regulating the occlusion of the teeth to enable alveolar ridge supporting tissues to bear proper pressure distribution, and manufacturing a three-dimensional model of the immediate complete or half denture by virtue of a photo-healing three-dimensional printing technique in the 3D printing technique. The method has the advantages that the production steps are simple, the production time is short, the precision is high, the denture can be conformably worn by a patient, and meanwhile, the production cost is lowered.

The invention relates to a preparation method of nanometer silica hollow microspheres. The method is characterized in that alkylphenol polyoxyethylene ether is taken as emulsifier, a water / oil liquor system is formed firstly, then a silica precursor which can be dissolved in oil phase is added, hydrolysis-condensation reaction is conducted on the precursor at the water-oil interface under aqua ammonia catalysis, and the nanometer silica hollow microspheres with uniform shell thickness and sufficient intensity are prepared after reaction for certain time and treatment.

The invention discloses a photo-cured medical catheter hydrophilic lubrication coating and a preparation method thereof. The hydrophilic lubrication coating comprises a bottom coating and a lubrication coating, wherein the bottom coating is attached to the surface of an instrument, and the lubrication coating is attached to the bottom coating. The bottom coating comprises 1-10 parts of polyester acrylate, 50-90 parts of solvents, 0.5-5 parts of photoinitiators, 0.5-2 parts of wetting agents and 0.5-5 parts of reactive diluents; the lubrication coating comprises 1-10 parts of water soluble macromolecules, 1-5 parts of crosslinking macromolecules, 0-1 part of photoinitiators, 0.1-1 part of surfactants and 50-98 parts of mixed solvents. The preparation method of the hydrophilic lubrication coating is simple and easy in operation, substance residues caused by complicated high-temperature chemical reaction are avoided, the cured coating forms a crosslinking structure, has good adhesion on the surface of a medical catheter and has excellent and lasting lubricity in an aqueous medium, the friction coefficient of the surface of the medical catheter is reduced, and harm to human tissues andadhesion of macromolecules in blood are decreased.

The invention relates to a microtube device and a using method thereof. The microtube device is characterized by comprising an upper layer of top cap layer and a lower layer of substrate layer, wherein the top cap layer is tightly connected with the surface of the substrate layer; the top cap layer and / or the substrate layer are / is provided with a branch microtube; the branch microtube consists of at least one activity screening tube, a buffer cavity and at least two branch tubes which are symmetrically distributed to the center of the buffer cavity; the buffer cavity is connected with the activity screening tube and the branch tube; meanwhile, the top cap layers corresponding to all the end positions of the branch microtube are provided with a hole respectively to form a sample inlet pool and a sample outlet pool; the sample inlet pools are communicated with the corresponding activity screening tube respectively; and the sample outlet pools are communicated with the corresponding branch tubes respectively. Cells can be cultured in situ in the sample outlet pool and can continuously generate a chemotactic matter by selectively adding cells capable of releasing the chemotactic matter into one or more sample outlet pools, so that uniform and stable chemical gradient fields are generated in the buffer cavity and the branch tubes. The microtube device has the advantages of simple manufacturing steps, low cost, quick and effective screening process, and easy popularization and use in ordinary laboratories.

The invention discloses a dimethyl carbonate supported catalyst directly synthesized by methanol and carbon dioxide and a preparation method and a use method. The catalyst adopts diatomite as carrier, transition metal copper and nickel as main components of active components and zinc, iron, cobalt and the like as additives, wherein, the weight percent of diatomite in the catalyst is 60-95%, the weight percent of the transition metals is 5-30% and the weight percent of the additives is 0-15%. The preparation method comprises the following steps: soaking the carrier in a mixed solution of soluble transition metal salt and the additives, dispersing with ultrasound, evaporating and drying, calcining and reducting with hydrogen to obtain the supported catalyst. The use method comprises the following steps: placing the catalyst in a reaction device, adjusting the molar ratio of gas phase methanol to carbon dioxide to 2:1-3:1, and performing a reaction at 110-140 DEG C under the pressure of 0.6-3.0 MPa. The catalyst has the advantage of simple preparation steps, good stability and high catalytic efficiency and overcomes the defect that the carrier used by the existing catalyst needs be processed through complicated steps for pretreatment and has high price and instable catalytic performance.

The invention relates to a medical hydrophilic lubrication coating of a water system. The coating is characterized by comprising a bottom coating adhered to the surface of an instrument, and a lubricating coating adhered to the bottom coating, wherein the bottom coating comprises the components as shown in the specification in parts by weight: 20-50 parts of aqueous binder, 0.05-0.3 part of aqueous surfactant, 1-5 parts of aqueous thickener; and 10-50 parts of deion water; and the lubricating coating comprises the components as shown in the specification in parts by weight: 5-10 parts of aqueous macromolecule; 0.05-0.3 part of the aqueous surfactant; 1-5 parts of the aqueous binder and 40-80 parts of the deion water. Compared with the prior art, the medical hydrophilic lubrication coating does not need volatile solvents, and can be used for effectively reducing the surface friction resistance.

The invention relates to a micro-fluidic apparatus integrated with a polydimethyl siloxane (PDMS) film, which is structurally characterized in that a flat glass sheet is pasted with a PDMS sheet, the pasting face of the PDMS sheet and the glass is provided with a groove to form a micro-fluidic pipeline, the surface of the PDMS sheet on the upper part of the central position of the micro-fluidic pipeline is a concave spherical surface, the thickness of the PDMS sheet between the lowest point of the concave spherical surface and the micro-fluidic pipeline is less than or equal to 10 microns, the PDMS sheet at two ends of the micro-fluidic pipeline is respectively provided with pores, and the pores are communicated with the micro-fluidic pipeline so as to form a fluid storage tank. The micro-fluidic apparatus can be applied to experiments such as film evaporation and crystallization or biological molecule concentration and the like in a micro-fluidic system. Special equipment is not needed to manufacture the micro-fluidic apparatus, the manufacturing step is simple, the cost is low, and the micro-fluidic apparatus is easily popularized and used in common laboratories. The invention also discloses a method for manufacturing the micro-fluidic apparatus.

The invention discloses a preparation method of a nitrogen-doped orderly-graded mesoporous carbon catalyst and application of the nitrogen-doped orderly-graded mesoporous carbon catalyst to proton exchange membrane fuel cells. The catalyst is prepared though a binary mixing template method; a triblock copolymer is used as a soft template agent and one or more of a Y-type molecular sieve, an MCM-41 molecular sieve and a ZSM-5 molecular sieve are used as a hard template agent; soluble resin is used as a carbon source; in a preparation process, a transition metal salt is added and a transition metal element is introduced in situ; meanwhile, a nitrogen element is introduced through roasting in an ammonia atmosphere. The nitrogen-doped orderly-graded mesoporous carbon material provided by the invention has an ordered mesoporous structure (with the size of 3nm to 5nm) generated by soft template induction and a three-dimensional through mesoporous structure (with the size of 10nm to 50nm) generated by hard template etching, has a high-activity specific surface and good mass-transferring performance and has excellent oxygen reduction catalysis performance and good electrochemical stability. By adopting the carbon material provided by the invention, application of the binary mixing template method to preparation of an oxygen reduction carbon-based catalyst is realized for the first time; meanwhile, the carbon material has the advantages of good process repeatability, low cost, good environmental friendliness and the like.

A driving device for an active matrix OLED display is disclosed, wherein a pixel electrode is directly contact the substrate, and the pixel electrode is connected electrically to the drain of the thin-film transistor through a drain electrode. Such a device decreases a leakage current and increases emission efficiency. A method of manufacturing the driving device is also disclosed.

The invention relates to 7-alkone lithocholic acid preparing method. It includes the following steps: dissolving the compound into the organic solvent to form electrolyte, electrolyzing the electrolyte by constant current at oxidizing medium condition to gain the object. The electrolyzing current density is 47.6A / m2-190.4A / m2. The invention has the advantages of moderate operation condition, green, simplifying ursodesoxycholic acid preparing steps.