88results about How to "Preparation fit" patented technology

The invention relates to a water-soluble drug sustained-release tablet and a preparation method thereof, the technology is characterized in that: the components and the weight percentages are as follows: 1 to 20 percent of water-soluble drug, 20 to 70 percent of hydrophilic gel, 30 to 50 of percent waxy material and the rest of filler, lubricant and other excipients that are commonly used for ordinary tablets. The method takes the hydrophilic gel sustained-release material and the waxy sustained-release material as a mixed matrix, the water-soluble drug is added to change the features of fast dissolution and short half life of the drug release, thus achieving the purpose of slow and smooth release. The drug of the invention has good stability, the needed equipment is simple, the manufacturing process is simple and easy, the operatability is strong, the in vitro dissolution test shows that the release rate is 25 to 35 percent in 2 hours, 55 to 65 percent in 5 hours and more than 80 percent in 10 hours, thus having good sustained-release effect. In addition, the sustained-release tablet is less affected by the gastrointestinal tract environment, the absorption is stable, and the individual difference is small, thus being the ideal sustained-release tablet.

The invention provides a freeze drying preparation method for ultra-fine tungsten-doped yttrium oxide composite powder. According to the freeze drying preparation method, a surface-active agent polyethylene glycol (PEG), polyvinylpyrrolidone (PVP) or polyoxyethylene lauryl ether are added on the basis of freeze drying for in-situ preparing of about 10 nm of ultra-fine nanometer W-Y2O3 composite powder. The freeze drying preparation method comprises the steps that ammonium meta-tungstate, yttrium nitrate hexahydrate and a surface-active agent are dissolved into water and are fully dispersed anddissolved through ultrasonic treatment; then a mixture is placed in a refrigerator to be pre-frozen for a period of time; after being pre-frozen, the mixture is put into a freeze dryer to be subjected to freeze drying; a freeze-dried loose structure is ground and calcined in air so as to remove the surface-active agent, and thus WO3-Y2O3 composite powder is obtained; and finally, two-step reduction is conducted through hydrogen, and thus the ultra-fine tungsten-doped yttrium oxide composite powder is obtained. The powder, with the surface-active agent being added, prepared through the freezedrying method is small in particle aggregation, the average grain size reaches about 10 nm, granularity distribution of grains is extremely narrow, and second-phase Y2O3 is distributed quite evenly.

The invention relates to an auxiliary alloy of neodymium iron boron permanent magnetic material and relative one-way control heat flow preparation method. The invention is characterized in that: said auxiliary alloy comprises one or several rare-earth elements, whose total amount is between 30-60wt%, and the other is transition group and one or several kinds of other metallic elements. The producing method comprises: melting raw material to cast the rotational water cooling disc; the rotational water cooling disc forces the water cooling to control the one-way hot flow direction to form the auxiliary alloy with fine cylinder crystal solidified organism. Compared to traditional neodymium iron boron auxiliary alloy producing method, the invention has high producing efficiency, non-component error analysis, uniform solidified organism, easy breakage and high magnetic property without uniform heating process.

The invention discloses a heterojunction solar cell taking a silicon nanorod array as a substrate and a fabrication method of the heterojunction solar cell. The solar cell uses a silicon nanorod array with a large depth-width ratio as the substrate, and other thin film materials are wrapped by a magnetron sputtering method to form a heterojunction structure. The fabrication method comprises the following steps of fabricating the silicon nanorod array with the large depth-width ratio on a surface of a P-type silicon wafer by a self-assembly method of a cesium chloride nanometer island; fabricating an aluminum back filed on a back surface; wrapping a surface of the silicon nanorod array with an N-type material layer such as zinc oxide and cadmium sulfide by the magnetron sputtering method; covering a surface of the N-type material layer with an ITO transparent conductive layer; and fabricating a titanium-silver electrode on an upper surface. The solar cell taking the silicon nanorod array with the large depth-width ratio as the substrate has the advantages that 1, the surface ratio of the substrate can be effectively increased, the effective area of a heterojunction is expanded, and absorption to incident light is improved; and 2, by means of a favorable light trapping effect, reflection can be reduced, and the performance of the heterojunction cell is improved.

The invention discloses a preparation method of a ligustrum lucidum ait total triterpene acid extract. The method comprises the following steps: (1) performing ultrasonic extraction on an ethyl alcohol solution of NaOH; (2) performing heat reflux extraction on ethyl alcohol; (3) performing adsorption by using macroporous resin; (4) performing elution by using a mixed solution of the ethyl alcohol, acetone and water; (5) performing extraction by using petroleum ether and the ethyl alcohol. The prepared ligustrum lucidum ait total triterpene acid extract has high total triterpene acid content (based on oleanolic acid and ursolic acid), namely the purity is high and is up to 70 percent or above; furthermore, the prepared ligustrum lucidum ait total triterpene acid extract contains definite chemical components; a blood fat-reducing medicine prepared from the ligustrum lucidum ait total triterpene acid extract is good in blood fat reducing effect and little in side effect. The preparation method disclosed by the invention is stable, controllable and suitable for large-scale industrial production.

The invention belongs to the technical field of chemical synthesis, and relates to a preparation method of Dolastatin 10 having anticancer activity and represented by the following formula. Accordingto the present invention, in the technical route for preparing the dolastatin 10, the used reagents are all commonly used reagents; the method has advantages of simple operation, high yield, low cost,convenient enlargement production and the like; and the experiment results confirm that the cost of the Dolastatin 10 preparation technical route is significantly reduced, the preparation of the 1-10g Dolastatin 10 can be conveniently achieved in the laboratory, and the method is suitable for large-scale preparation. The formula is defined in the specification.

The invention provides a nano tungsten powder preparing method through adding of a surface active agent via freezing drying. According to the method, on the basis of freezing drying, one of surface active agents including polyethylene glycol PEG, fatty alcohol-polyoxyethylene ether AE and polyvinylpyrrolidone PVP is added for in-situ preparing of ultra-fine nano tungsten powder. The surface activeagent and ammonium metatungstate are dissolved in water, and ultrasonic treatment is conducted for sufficient dispersing and dissolving; then pre-freezing is conducted in a refrigerator and other low-temperature environments; after pre-freezing, the mixture is placed in a freezing drying machine to be frozen dry; after freezing dry, grinding is conducted, the surface active agent is removed through roasting in air, and the ultrafine WO3 powder is obtained; and finally, hydrogen is subjected to two-step reduction, and the ultrafine nano tungsten powder is obtained. The powder prepared throughthe freezing drying method after the surface active agent which is PEG, or AE or PVP is small in particle aggregation, the average grain size reaches 10-30 nm, and grain granularity distribution is extremely narrow. The ultrafine nano tungsten powder prepared through the method has obvious advantages.

The invention provides a preparation method for rotary roasting and reduction of yttrium oxide doped tungsten composite powder. Precursor powder obtained through various chemical methods is put in a rotary furnace, and the rotating speed of a furnace pipe is adjusted; the precursor powder is roasted in the furnace; and then two-step reduction is carried out in the reducing atmosphere, cooling is carried out in the reducing atmosphere to room temperature, and finally the ultrafine yttrium oxide doped tungsten composite powder is obtained. The preparation method for rotary roasting and reductionis suitable for precursor powder prepared by all chemical methods; and meanwhile, compared with traditional roasting and reduction of precursor powder, the reduction efficiency of the preparation method for rotary roasting and reduction can be improved by 10 times or above. Meanwhile, resources are saved, cost is reduced, and time is saved.

The invention discloses a graphite-graphene-metal composite material preparation method which comprises the steps of (1) depositing graphene on a coper foil, superimposing multiple layers of copper foils deposited with graphene layers together, and forming a copper-graphene composite layer, wherein the thickness of the copper-graphene composite layer ranges from 1mm to 8mm; (2) preparing a copper-graphite composite layer: uniformly mixing a copper-plated graphite sheet and copper powder, and spreading out to form the copper-graphite composite layer, wherein the thickness ranges from 1mm to 10mm; and (3) alternately stacking the copper-graphene composite layer and the copper-graphite composite layer, and hot-pressed sintering to form a graphite-graphene-metal composite material provided bythe invention. According to the graphite-graphene-metal composite material preparation method provided by the invention, through superimposing and compounding the structure layers with excellent heat-conducting property and electricity-conducting property, a structured anisotropic material with a heat-conducting channel and an electricity-conducting channel which do not influence each other is formed; and meanwhile, due to the same metal matrix, the structure layers are combined tightly, the overall mechanical property and the processability are favorable, and the composite material as a whole shows excellent heat-conducting property and electricity-conducting property and can meet the demand of modern electronic industrialization.

The invention discloses a preparation method of a PbMo6S8 superconducting wire. The method comprises the steps that: precursor powder is prepared through adoption of a high-energy ball milling method;then, the PbMo6S8 precursor powder is put into a Mo pipe; the Mo pipe is processed into a PMS single-core wire / bar; and then a plurality of PMS single-core wires / rods and a central copper wire / rod are loaded into a stainless steel pipe or a Monel 400 jacketed pipe for secondary assembly, a multi-core PMS precursor wire rod is manufactured through stretching, and the wire rod is subjected to high-temperature melting quenching treatment and phase-forming heat treatment to obtain the PMS superconducting wire rod. MRHQ and phase-forming heat treatment are adopted to replace traditional diffusionphase-forming heat treatment, intergranular impurities in the superconductor are remarkably reduced, grain connectivity is improved, and therefore the critical current density of the wire is remarkably improved. The method is simple, is suitable for preparing the superconducting long wire, is beneficial to large-scale popularization and application, and has huge commercial value.

The invention belongs to the technical field of nanometer material synthesis, and particularly relates to a nanometer silver particle and a synthetic method thereof. The nanometer silver particle is in a spherical shape or a similar spherical shape, the surface of the nanometer silver particle is provided with a biomolecule wrapping layer, and biomolecules contain carboxyl groups with negative charge oxygen atoms. The nanometer silver particle is of a cubic crystal structure, and the particle diameter of the nanometer silver particle is 50 to 150nm. The nanometer silver particle is prepared by a biological material reduction method, orange juice and Ag<+> solution are uniformly mixed, the stirring is carried out at 26 to 34 DEG C, the centrifugal separation is carried out after the reaction completion, precipitates are washed and dried, and the nanometer silver particle is obtained. The biomolecules in the orange juice are used as templates, AgNO3 solution is utilized for providing silver ions, and the nanometer silver particle with the spherical appearance is synthesized through regulation and control. In fruit and vegetable juice such as orange juice, oxygen atoms on the groups such as carboxyl contained in biomolecules such as amino acid and vitamin mostly carry residual negative charges, the residual negative charges generate mutual effects with Ag<+>, nucleation sites are provided, and the generation of the nanometer silver particle is induced, regulated and controlled.

The invention belongs to the field of flexible FSS radar wave-absorbing structures, and more particularly to a flexible resistive film frequency selective surface, a preparation method and application thereof. The method comprises the steps of: printing a set frequency selective surface pattern on a photosensitive film, and attaching the photosensitive film to the surface of a flexible dielectric substrate; successively exposing and developing the photosensitive film on which the frequency selective surface pattern is printed in order to expose the frequency selective surface pattern on the surface of the flexible dielectric substrate; coating the surface of the developed flexible dielectric substrate with resistive conductive carbon paste, and sintering and curing the flexible dielectric substrate coated with the conductive carbon paste, wherein the cured conductive carbon paste is a resistive film; demolding the cured flexible dielectric substrate, removing the photosensitive film and the resistive film on the surface of the flexible dielectric substrate to obtain the flexible resistive film frequency selective surface. The FSS surface preparation method of the invention is simple, and can produce a large-area flexible passive resistive film frequency selective surface applied to a curved surface.