173results about How to "Controllable ratio" patented technology

The invention relates to a method for design advanced materials with nano-scaled structure and techniques for preparing same. In particular, the invention relates to a carbon material capable of controllable laminated combination with the nano-holes of variable sizes and preparation and application thereof. The method comprises the steps of: preparing metal oxide sol in the alkali solution system, which is then mixed with an alcohol solution of an alcohol-soluble resin; the oxide sol being used as the template and water being the resin precipitation agent during the process to directly prepare resin / oxide sol composite system. After solvent removal, carbonization, activation and template removal processes, the carbon material with laminated nano-holes combination is prepared which is of controllable micro-holes proportion, controllable medium-holes aperture and proportion, controllable big-holes aperture and propotion and concentrated distribution of medium-holes and big-holes apertures. The carbon material capable of controllable laminated combination with the nano-holes of variable sizes prepared in the invention is characterized in laminated holes structure, excellent ion transfer performances and high electrochemical active specific surface area and the material is expected to be used as high energy density high power density electrochemical capacitor used electrode material.

The invention relates to the means of active biological film, especially the titanium radicel porous nanometer Strontium hydroxyapatite active biological film and the Process for the manufacture. The differential arc oxidation technology is used in the method, the film is generated in the surface of titanium and titanium alloy, a electrolyte solution with phosphate radical ion, calcium ion and Strontium ion is supplied; the titanium and titanium alloy is the anode and the rustless steel or the titanium is the cathode, the direct current power supply or the direct current impulsing power source is applied to differential arc oxygenize the titanium and titanium alloy; the oxidate time is 3-60min; the temperature of electrolyte is not above 50DEG C. There is no interface between the porous hydroxyapatite containing Strontium film produced by the invention and the basal body, the modulus of elasticity is approximate with the sclerotin, the porous hydroxyapatite containing Strontium film produced by the invention which has perfect bioactivity can be the alternate material of several parts with heavy load, such as femur, hip joint and teeth root.

The invention relates to a method for preparing a neutral mixed crystal nano TiO2 hydrosol with high stability, belonging to the photocatalytic active nano titanium dioxide material preparation process technical field. The method comprises the main steps that: 1. a titanium compound is hydrolyzed by aqueous slkali and deposited, filtered and washed; 2. products obtained are added in an acid solution and peptized at the temperature of between 60 and 100 DEG C, and added with a certain amount of SiO2 sols used as a stabilizer and metal salt used as a doping agent to be continuously reacted for a period of time; 3. the mixture is added with alkaline liquor for adjusting the pH value to between 7 and 8; 4. the mixture is filtered and washed, and filter cakes are dissolved in a certain amount of water and redispersed, and finally the neutral mixed crystal nano TiO2 sol with high stability is obtained. The TiO2 compound hydrosol prepared by the invention is neutral and has good transparency and stability, and the crystal form ratio of anatase and rutile is controllable, and the spectral response range is wide; the TiO2 hydrosol prepared by the invention is convenient in coating operation; moreover, the hydrosol can utilize the solar energy to complete sewage disposal, air purification, antibiotic treatment and glass film coating treatment, etc.

The invention provides crosslinking sodium hyaluronate gel and a preparation method thereof. The preparation method comprises the following steps: dropwise adding a crosslinking agent in an aqueous alkaline solution of sodium hyaluronate and carrying out crosslinking reaction; after reaction is finished, adjusting pH value of a system to be 7.1-7.5 with acid; stirring for 1-2 hours; and then precipitating with anhydrous ethanol to obtain the crosslinking sodium hyaluronate gel. The shortcoming that the proportion of crosslinking modification degree in a traditional crosslinking technology is lower (about 10%) is overcome effectively, and the proportion of the crosslinking modification degree is increased to be about 60% and is controllable. An ultrasonic crosslinking technology is introduced, the proportion of the crosslinking modification degree in crosslinking hyaluronic acid can be increased effectively, the proportion of suspension modification degree is reduced, and degradation time of a material is prolonged.

The invention discloses a preparation method of a magnetic nanometer molecular imprinting composite material related to estrogen, comprising the following steps: dissolving bivalent iron salt and trivalent iron salt into water, performing ultrasonic dispersion, heating and regulating the system till being alkali, stirring the system, performing magnetic separation, washing the system till that pH is 6-8, and drying the system; adding ethanol solution, performing heating, stirring and dropping oleic acid, performing magnetic separation, washing the system till that pH is 7.0, and drying the system; adding a dispersant, a polymerization monomer, a functional monomer and a cross linker, and performing ultrasonic dispersion; adding an initiator, performing heating, stirring and magnetic separation, washing the system till that pH is 6-8, and drying the system; adding a composite reaction liquid of a template molecule and amino functional reagent, performing heating, stirring and magnetic separation, washing the system till that pH is 6-8, and drying the system to obtain a target product. The preparation method has the advantages of simple preparation process, controllable magnetic content, controllable functional group proportion and so on, and can arrive at a high enrichment factor when being applied in residual trace phenol environmental estrogens in enrichment drinking water.

The embodiment of the invention discloses a wafer test classification method and system, belongs to the technical field of chips, and the method comprises the steps: obtaining the online multi-wafer test data of a target wafer before a packaging step, wherein the test data comprises specified parameter test result data of the target wafer under different temperature and voltage test conditions; performing performance power consumption classification on each chip of the target wafer through a preset chip classification model according to the acquired specified parameter test result data; and generating a packaging graph including product specification information corresponding to each chip according to a preset corresponding relationship between the performance power consumption classification and the product specification. According to the invention, offline chip performance analysis and classification can be carried out according to wafer test parameters, thereby achieving the purposes of improving the performance level of a final device, meeting the requirements of product specifications with different performance and power consumption, and improving the productivity of actual products.

The invention provides a copper-based Cu-Cu2O-CuO catalyst for an organic silicon monomer synthesis reaction as well as a preparation method and an application of the copper-based Cu-Cu2O-CuO catalyst. The catalyst comprises components in percentage by mass as follows: 0-40% of elementary Cu, 40%-90% of Cu2O and 0-40% of CuO, and the sum of mass percentages of all the components is 100%. The method comprises steps as follows: a copper salt is dissolved to form a copper salt solution; an alkaline solution is dropwise added to the copper salt solution, and copper hydroxide precipitate is obtained and then converted into CuO precipitate; then a certain quantity of reducing agent is dropwise added to a CuO suspension for a controllable reduction reaction; obtained reaction products are filtered, washed and subjected to vacuum drying, and then the multicomponent copper-based catalyst is obtained. The experimental process route is simple, the controllability is high, and the prepared multicomponent copper-based catalyst is smaller in particle size and evener in particle size distribution, contains controllable components and shows the higher M2 selectivity and the higher silicon powder raw material conversion ratio.

This invention relates a (substituting) styrene polymer type quaternary ammonium salt anti-static agent or germicide and preparation method. ( substituting)styrene homopolymerization or copolymerization with comonomer form straight chain polymer, take fu-ke reaction with oxirane in fine solvent, introduce ethoxyl to benzene ring of straight chain polymer, then use proper halogenating agent for halogenation, form Alpha - halogenation ethyl, then takes reaction with tertiary amine, thereby form quaternary ammonium salt that molecular weight about 400 to 200000. This macromolecule quaternary ammonium salt could form macromolecule permanent type anti-static agent or germicide, used in antistatic as well as sterilization of PVC, PP, PE, ABS and such on molecule stuff.

The invention relates to multi-element composite metal oxide hollow nanospheres and a preparation method thereof. The method comprises the following steps of dispersing carbon spheres in a hydrotalcite colloidal solution, allowing hydrotalcite flakes to be adsorbed on the surface of the carbon spheres by the action of electrostatic attraction, removing the supernatant containing non-adsorbed hydrotalcite flakes by centrifugal separation to obtain a pure hydrotalcite-coated carbon sphere material, and then calcining to obtain multi-element composite metal oxide hollow nanospheres which have uniform size and controllable metal element proportions. The general formula of the hollow nanospheres is MIIO / MIII2O3, wherein MII represents bivalent metal cations, MIII represent trivalent metal cations; and the specific surface area of the hollow nanospheres is 140 to 240 m<2> / g. The multi-element composite metal oxide hollow nanospheres have good application prospects in the fields of catalysis, adsorption and sustained release drug delivery.

The invention discloses a preparation method for stannic oxide / carbon composite hollow balls. Solder balls are added into an aqueous solution of glucose for ultrasonic dispersion, and then is transferred to a hydro-thermal reaction kettle; then the temperature is raised to 160-200 DEG C, and preserved for 30-720 minutes; after the reaction, centrifugal separation and drying are implemented; and then thermal treatment is implemented under nitrogen atmosphere to obtain a final product. In the preparation method, the solder balls are served as sacrificial templates, which do not need to be removed after the reaction; therefore, mass production can be realized; stannic oxide / carbon composite hollow balls are synthesized through simple one-step hydro-thermal reaction, which further simplifies processing steps, and reduces the cost; moreover, the proportions of stannic oxide to carbon are controllable, which is beneficial for subsequently intensive study on the performances of lithium ion batteries manufactured by stannic oxide / carbon composite hollow balls.

The invention discloses a method for preparing thiolated nano ferroferric oxide magnetic polymer composite material. The method comprises the following steps of: dissolving Fe2<+> and Fe3<+> in water, wherein a dropwise adding system is alkaline, heating, stirring to react, washing until the pH value is 7, and drying the reaction product; adding an ethane solution into the reaction product, heating, and adding an oleic acid with stirring; adding a dispersing agent, adding a monomer for polymerization, an epoxy functional monomer and a cross-linking agent, and performing ultrasonic dispersion;adding an initiator, heating, stirring to react, washing until the pH value is 7, performing magnetic separation and drying the reaction product; performing ultrasonic dispersion, adding an epoxy vulcanizing reagent, heating, stirring to react, washing until the pH value is 7, performing magnetic separation and drying the reaction product; and performing ultrasonic dispersion, dropwise adding NaHS solution, stirring to react, washing until the pH value is 7, performing magnetic separation and drying the reaction product to obtain the target product. The invention has the advantages of simple preparation method, low cost, uniform particle size distribution, stable performance and capability of absorbing and removing superstandard heavy metal Hg from water, of the obtained target product, innocent treatment, water resource protection and the like.

The invention discloses a method for producing pepper oil with stable quality and a high spicy degree. The method includes the steps that (1) dry pepper raw materials are crushed, steam distillation is carried out, and pepper aromatic oil is obtained after oil-water separation; (2) pepper powder obtained after steam distillation is extracted through ethyl acetate, solvents with pepper resin are obtained through filtering, 5% sodium hydroxides are added into the solvents, heating and stirring are carried out for two hours, then the solvents are cooled to be at the room temperature, ethyl acetate solvents are obtained after separation, activated carbon is added for adsorption, the solvents are obtained after filtering, reduced pressure distillation is carried out for concentration, and pepper oil resin with the high spicy degree and good fluidity is obtained; (3) pepper aromatic oil obtained in the step (1) and the pepper resin obtained in the step (2) are mixed, and a pepper oil product with stable quality is obtained. The proportion of pepper spicy substances and pepper aromatic substances is controllable, the content of pectin and polysaccharide is little, foreign flavor does not exist, the smell and flavor are pure, the fluidity is good, meanwhile, the oil solubility is good, emulsifier does not need to be added during dissolving, suspended matter and sediments do not exist, and transparency is high.

The invention discloses a preparation method of an iron trioxide / carbon yolk-eggshell nano-composite structure. The preparation method includes taking iron trioxide nano-particles as centers, controlling thickness of coated silica through controlling quantity of ethyl orthosilicate, coating a layer of carbon outside silica through a thermal decomposition method, and obtaining the iron trioxide / carbon yolk-eggshell nano-composite structure by removing the silica in the middle layer. With the preparation method, the iron trioxide / carbon yolk-eggshell nano-composite structure is composited through simple coating processes, production cost is reduced and mass production can be realized; and besides, the hollow iron trioxide / carbon yolk-eggshell nano-composite structure is beneficial for improving performance of lithium ion battery negative electrode materials.

The invention discloses a one-dimensional rod-shaped sulfur-copper compound as well as a preparation method and an application thereof and relates to a sulfur-copper compound. The one-dimensional rod-shaped sulfur-copper compound is one-dimensional rod-shaped CuxS, wherein x is greater than or equal to 0 and less than or equal to 2. The preparation method of the sulfur-copper compound comprises the following steps: dissolving inorganic salt of copper in a dimethyl sulfoxide solvent, magnetically stirring to prepare a light green solution, then adding the light green solution into a reaction kettle, subsequently putting the reaction kettle into an air-blowing drying oven for heating and reacting, then centrifugally washing and drying to obtain a black one-dimensional rod-shaped sulfur-copper compound. The one-dimensional rod-shaped sulfur-copper compound can be used for preparing a negative electrode of a lithium ion battery. The one-dimensional rod-shaped sulfur-copper compound is prepared by a solvent thermal synthesis method; the synthesis method is simple and quick; specific surfactants and relevant templates are not required to be added. The prepared material has specific one-dimensional structures; the one-dimensional linear structures can be used for forming a good three-dimensional network structure by cross linking and stacking; the transmission of lithium ion electrons and infiltration of electrolyte are facilitated, so that the one-dimensional rod-shaped sulfur-copper compound has good electro-chemical properties.

The invention discloses a preparing method of tubular TiO2 / reduced graphene oxide composite. The preparing method includes: with TiOSO4 as a titanium source and Pluronic block copolymer (P123) as a soft template, synthesizing tubular TiO2 in mixed solution of ethyl alcohol, ethylene glycol and diethyl ether; synthesizing graphene oxide by means of the modified Hummers method; at high temperature, from the tubular TiO2 AND THE graphene oxide, assembling and preparing the tubular TiO2 / reduced graphene oxide composite by a hydrothermal method. During the preparation of the tubular TiO2 / reduced graphene oxide composite, no reducing agent is added; the graphene oxide is subjected to high-temperature hydrothermal reduction, which is green; the addition of the graphene oxide has no evident effect on the TiO2 shape; the TiO2 helps effectively maintain the tubular shape; the tubular TiO2 / reduced graphene oxide composites different in proportion can be made by adjusting the ratio of the TiO2 to the graphene oxide.

The invention discloses preparation methods for an arrayed nickel silicon nanowire and a nickel silicon-silicon core-shell nanowire. The preparation method for the nickel silicon-silicon core-shell nanowire comprises the following steps of: washing a metal substrate for a lithium ion battery anode basal body by using a hydrochloric acid and ethanol, and drying the washed metal substrate for lateruse; growing the arrayed nickel silicon nanowire on the surface of the washed metal substrate by using a hot wire chemical vapor deposition device; and further depositing a layer of thickness-controllable silicon on the surface of the obtained arrayed nickel silicon nanowire by using a radio frequency sputtering method to obtain the arrayed nickel silicon-silicon core-shell nanowire. The metal substrate and the arrayed nickel silicon nanowire grown on the metal substrate form a lithium ion battery anode. The preparation methods provided by the invention are simple and controllable; and the prepared nanowire materials can be used for the lithium ion battery anode and high performance can be obtained.

The invention provides a method for preparing a cadmium telluride thin-film solar cell. The method is an improvement aiming at factors which have never been concerned or thought about by technicians in the field, the electron transport capacity of a p-type CdTe layer is improved in an energy excitation mode, the electron concentration of the p-type CdTe layer is increased in the energy excitation mode, and the purpose that a Te-enriched layer is effectively electrodeposited on the CdTe layer subjected to thermal treatment is achieved. Meanwhile, according to the method for preparing the cadmium telluride thin-film solar cell, the purpose that the proportion of Te / Cd in the Te-enriched layer is controllable is achieved with a cathode potential gradual change method, and the concentration of Te atoms increases in a gradient mode in the direction of being away from a substrate of the cadmium telluride thin-film solar cell.

The invention relates to a preparation method of a carbon-based composite material for a cathode of a lead-carbon battery, which can prepare a carbon-based lead compound composite material with a controllable proportion, wherein the lead compound uniformly distributes on the surface of carbon material and maintains the original structure character of the carbon material. The preparation method isas follows: the carbon material and a lead ion solution are uniformly mixed in a reaction vessel, a precipitant is slowly dropped, the lead ions are completely deposited on the surface of the carbon material, then filtered, washed and dried to obtain a precursor, and the composite material is obtained through high temperature treatment, and mass ratio of lead compounds is between 1% to 90%. The composite material and the active substances of cathode of lead-acid battery can be better combined by the lead oxide particles on the surface, while the cathode capacity of the cathode of the battery prepared by using the composite material additive is obviously increased, the hydrogen evolution of the cathode is reduced, cathode active material utilization rate is also greatly improved, and the cycle life of high-rate charge-discharge of partial charge state of the cathode is significantly prolonged.

The invention provides a preparation method of an anatase TiO2 monocrystal having a high-activity (110) face. The method comprises the following steps: 1, sequentially adding water, hydrofluoric acid and hydrogen peroxide to titanium powder, and stirring to obtain a titanium-containing solution; 2, reacting the titanium-containing solution in an autoclave at 120-220DEG C for 1-40h; 3, washing a reaction product obtained in step 2 with water and an organic solvent until the pH value is 6.5-7.5, and drying to obtain a solid; and 4, grinding the solid obtained in step 3, and calcining the ground solid at 120-900DEG C for 1-6h to obtain the anatase TiO2 monocrystal having a high-activity face. The preparation method has the advantages of low cost, simplicity, mild reaction, full utilization of above reaction raw materials, no generation of harmful gasses, and strong process repeatability.

The invention relates to a preparation method of copper and magnesium master alloy, comprising the following steps of: (1), firstly weighing raw materials (in percent by weight): 10% to 50% of magnesium and 50% to 90% of copper; (2) melting the weighed magnesium in a vacuum melting furnace; raising the temperature to 800 DEG C; regulating the vacuum degree to 0.1 to 0.3 Pa; adding the copper; quickly raising the temperature to 1150 DEG C to 1280 DEG C; uniformly stirring by a stone grinding stick until completely melting the copper and thoroughly reacting; and (3) directly pouring reactants by a water cooling copper mould to form a cast ingot to prepare the copper and magnesium master alloy. The preparation method of the copper and magnesium master alloy is used for largely reducing the burn of the magnesium; the proportion of the alloy is easily controlled; the oxidation degree of the copper is reduced; only the outer surface of a cast is black; after being ground, the alloy is bright copper; the inner part of the alloy does not have any defect; and the preparation method is especially suitable for scale production and application.

The invention discloses a magnetic field-induced preparation method of a molecularly-imprinted magnetic enrichment material of trace quantity of chlorophenol pollutant molecules in seawater. The preparation method comprises that under magnetic field induction, an epoxy group-functionalized magnetic polymer is prepared by suspension polymerization and in-situ oxidation, a chlorophenol environmental pollutant polyamine template molecule is obtained by an intermolecular hydrogen bonding self-assembling technology, an amino-functionalized magnetic molecularly-imprinted composite material bonding with the template molecule is prepared under magnetic field induction, and in the presence of an acid / alcohol extractant, through pH adjustment, the template molecule is eluted and the chlorophenol molecule-imprinted magnetic composite material is obtained. The preparation method has simple processes and a low cost and realizes uniform particle size distribution and stable properties of the desired product. The molecularly-imprinted magnetic enrichment material can realize high-efficiency and high-selectivity adsorption and removal of trace quantity of chlorophenol pollutants in seawater and can be used for base dispersion-magnetic solid phase extraction detection of trace quantity of chlorophenol pollutants in seawater.

The invention relates to a preparation method of a hierarchically-structured composite material with nano-ceramic particle reinforced metal matrix and belongs to the technical field of metal matrix composite materials. The method comprises the following steps: carrying out high-energy ball mill mixing of nanoscale ceramic particles with metal powder; then melting to obtain molten metal, keeping the temperature at 30-80 DEG C below a liquid phase line and forming part of spherical grains in the molten metal; adding ceramic-metal mixed powder into the molten metal, stirring and enabling nano-ceramic powder to be uniformly dispersed in the molten metal among the spherical grains; preparing cast ingots; processing the cast ingots by rolling, extruding and drawing, enabling the spherical grainsin the cast ingots to be changed into lamellar or fibrous grains so as to obtain the hierarchically-structured composite material composed of the nano-ceramic particle reinforced metal matrix and thelamellar or fibrous grains. The method is capable of preparing a metal matrix composite material with excellent strength, plasticity and comprehensive performance.

In the invention, polymer dielectric instead of liquid electrolyte is applied to lithium cell to produce cell in different shapes with performances of safety, lightweight and high energy density. In contrast, in prior art, there are disadvantages such as unstable liquid and bad mechanical properties in existed technique. Gel state inorganic-organic hybrid polymer dielectric is prepared through ultraviolet light radiation to trigger off polymerization. The polymer dielectric is amorphous in room temperature possessing features of high conductivity, stable thermal and mechanical properties. Advantages of ultraviolet light solidifying method are one-step molding, simple technique, high efficiency, no pollution. Performed polymer of inorganic-organic hybrid polymer is prepared by reconstructing end group after sol-gel reaction of alkoxyl silicon compound. In room temperature, ionic conductivity is reached to 8.4x10 to the power -3 Scm being close to conductivity of liquid electrolyte.

The invention discloses a preparation method of a magnetic molecularly imprinted composite material of chiral rodenticide bromadiolone. The preparation method comprises the following steps of: adding magnetic nanometer ferroferric oxide particle modified via oleic acid to a dispersing agent; adding polymerizing monomer, functional monomer and cross-linking agent; ultrasonically dispersing; adding an initiator; heating; agitating to react to obtain single dispersive polymer composite microsphere rich in epoxy groups; washing until pH (Potential Of Hydrogen) reaches 6 to 8; then drying; adding composite reacting liquid of bromadiolone and an amino functional agent; heating; agitating to react; magnetically separate; washing until the pH reaches 6 to 8; adding organic solvent; ultrasonically eluting to remove template molecule bromadiolone until no bromadiolone an be detected in the eluant through superfast efficient liquid chromatography-tandem mass spectrum; and then drying to obtain a target product. The preparation method disclosed by the invention has the characteristics of being simple in preparation technology, controllable in magnet content, and controllable in ratio of functional group and the like; a product is applicable to enriching, purifying, analyzing and detecting of bromadiolone residual in a biological sample; and the preparation method has a wide application prospect.

The invention discloses an anti-tumor nano-drug. The anti-tumor active ingredient of the nano-drug exists mainly in the form of a lipoic acid polymer. The invention further discloses a preparation method and application of the nano-drug. The anti-tumor nano-drug solves the problem of large toxic and side effects of the traditional chemotherapeutic drug. Meanwhile, the anti-tumor active ingredientis also used in combination with other substances having the anti-tumor activity, and enters the cell at the predetermined ratio, the synergistic anti-tumor effect that one plus one is more than 2 isachieved, and the anti-tumor nano-drug has a broad application prospect.

The invention provides a preparation method of a white light OLED, which comprises the following steps: firstly, cleaning and drying ITO glass, and then, carrying out plasma bombardment pretreatment; then, transferring the ITO glass after treatment into a film plating machine; and simultaneously, sequentially transferring materials for an electronic blocking layer, materials for a hole transport layer, materials for a light-emitting layer, materials for an electron transfer layer and materials for a cathode layer into the film plating machine for evaporating. The evaporating process of the light-emitting layer comprises the following steps: firstly, carrying out double-source co-evaporation on a main material and a blue doping agent, wherein the ratio of the blue doping agent is 2%; and finally, carrying out three-source co-evaporation on the main material, the blue doping agent and a red doping agent, wherein the ratio of the blue doping agent is 2%, and the ratio of the red doping agent is 6%. In the invention, only red and blue doping materials are doped in the main material of the light-emitting layer, thus the doping ratio can be controlled easily, and the white light emitted a the prepared device is uniform; and the invention has the advantages of simple process and low cost.

The invention provides a new technique for synthesized civil (DNT) with good quality, which regards toluene and nitric acid as raw materials, concentrated sulfuric acid as catalyst, and carbon tetrachloride with low boiling point as solvents; in certain conditions, the DNT is produced directly, the yield of the products can reach 96.4 percent, the purity is above 98 percent, and the quality of the products satisfies the first-rate standards, 2,4-DNT / 2,6-DNT is equal to 80 plus or minus 1 / 20 plus or minus 1, as organic solvent is introduced, little influence of temperature is caused towards the isomer ratio of products in reaction, and the conditions of nitration reaction are mild, the ratio of isomer produced is easy to be controlled, the density of waste liquid is high, and nitrate containing amount is low, which is beneficial for the concentration of waste liquid and the reduce of emission of waste water, primary nitrification and secondary nitrification are both carried on in the same reaction kettle, the technique is simple, the production cost is low, the requirement of environmental protection is satisfied, so the new technique for synthesized civil DNT with good quality has rather great implementary value and social economic benefits.

The invention discloses a construction method of a recombinant bacterium for producing short-and-medium-chain-length PHA and functional derivatives thereof. The method comprises the following steps of: introducing a coding gene of specific PHA polymerase, a coding gene of a key protein of a PHA synthesis pathway, a promoter or a mutated promoter, related genes capable of enhancing carbon source utilization capacity of medium-chain and long-chain fatty acids, the ribosome binding site RCJ and the ribosome binding site RD into a starting strain from which an endogenous PHA polymerase gene is knocked out; and adjusting the proportions of all monomers in the short-and-medium-chain-length PHA and the functional derivatives thereof in the recombinant bacteria so as to realize controllable production of the short-and-medium-chain-length PHA and the functional derivatives thereof.

The invention relates to the technical field of preparation of traditional Chinese medicine decoction pieces, and particularly relates to a preparation method of a traditional Chinese medicine decoction piece of bile arisaema. The preparation method comprises the following steps: preparation of prepared arisaema micropowder; weighing and mixing; preparation of soft particles; and preparation of hard particles. The preparation method solves problems of long processing period of a fermentation method, as well as high toxicity, unstable product and difficult quality control of a mixing method, reduces the toxicity of medicine powder by treatment of the prepared arisaema to reduce irritation of a traditional Chinese medicine of bile arisaema, realizes a fixed product formulation ratio throughbile powder obtained by processing to achieve the purpose of controlling the quality, and has the advantages of simple process operation, convenient product use and short processing period. The invention also provides tablets or granules of the traditional Chinese medicine decoction piece of bile arisaema prepared by the preparation method, and has the advantages of good stability and conveniencein use.

The invention discloses silver-palladium alloy powder for a conductive composition and a preparation method of the silver-palladium alloy powder. After silver powder and palladium powder are evenly mixed physically, a solid phase alloy reaction is carried out in low-temperature and high-pressure environments, and therefore the silver-palladium alloy powder is obtained. The silver-palladium alloy powder can be directly applied to the conductive composition, and the reliability indexes such as the welding resistance and the aging tension of the conductive composition can be effectively improved.Compared with the prior art, the silver-palladium alloy powder for the conductive composition and the preparation method of the silver-palladium alloy powder have the beneficial effects that the operation is easy, environmental pollution is low, the silver-palladium ratio is accurate, convenience is achieved, and the granularity of the powder is controllable, and the prepared silver-palladium alloy powder can be directly applied to thick film electronic paste.