69results about How to "Low preparation cost" patented technology

The invention provides a method for preparing a titanium dioxide nano tip array film for field emission, mainly comprising the following steps of: firstly, performing primary anodic oxidation on a swing-cleaned titanium sheet, and then removing the titanium dioxide nano-tube film attached to the titanium sheet through ultrasound; and next, loading the titanium sheet into the electrode again and performing secondary anodic oxidation, and then taking out the titanium sheet for cleaning through swinging to finally obtain the titanium dioxide nano tip array film. The method provided by the invention realizes the preparation of the titanium dioxide nano tip array film suitable for field emission. Compared with the traditional microelectronic field emission tip array, the method provided by the invention is simple, and preparation parameters are easy to control; and the tip of the array is sharp, which is advantageous for gaining field emission. Furthermore, the titanium dioxide nano tip array film annealed at high temperature previously has lower opening and threshold field intensity; and particularly, the sample annealed at 450 DEG C has the minimum opening and threshold field intensity and is obviously improved in field emission performance.

The present invention provides a process for producing a tea extract, which comprises adding a protease, a tannase and an enzyme preparation having a polygalacturonase activity of 20000 U/g or more to a tea raw material and extracting the desired tea extract from the mixture. According to this process, a tea-leaf-derived cell wall component that cannot be decomposed or extracted by conventional enzymatic tea leaf extraction techniques can be extracted, and a protein of which the extraction becomes possible through the success of the decomposition of the cell wall component can be further decomposed into an amino acid. As a result, it becomes possible to produce a tea extract which contains an amino acid in abundance and is rich in sweet flavor, robust flavor and "umami" (tasty) flavor in high yield.

The present invention relates to a method for preparing a polyimide using water as a dispersion medium for reaction and, more particularly, to a method for preparing a polyimide by dispersing a dianhydride compound and a diamine compound in water and reacting the compounds in a pressurized state within a sealed pressure vessel under temperature conditions of 5 degrees or above. The present invention also provides a method for recovering water by discharging vapor generated during the preparation of the polyamide and cooling and condensing the vapor. By using water as a dispersion medium, the method according the present invention does not generate organic-based waste fluid and is thus environmentally-friendly, reduces production costs, minimizes residual solvents after drying and thus does not have a problem that physical properties are degraded due to the residual solvents, and is advantageous in that the reaction temperature is lower, reaction steps are reduced, and the reaction time is shortened compared to conventional methods. Since water can be recovered after the reaction is completed, the method also allows recycling of water and is thus economical and very environmentally-friendly. In addition, the polyimide prepared by the method according to the present invention has the advantage of increasing thermal stability and molecular weight compared to polyimides prepared by conventional synthesis methods.

The invention relates to a nanowire semiconductor gas sensitive material based on a GaN-Ga2O3 core-shell structure, belonging to the technical field of electron gas sensitive devices. The nanowire semiconductor gas sensitive material is characterized in that the surface layer of a GaN nanowire with diameter of 50-500nm is oxidized at high temperature into a layer of Ga2O3 with the thickness of 5-20nm, so that a nanowire semiconductor gas sensitive material with the GaN-Ga2O3 core-shell structure is obtained, and the nanowire semiconductor gas sensitive material with the GaN-Ga2O3 core-shell structure can be used for detecting gases with harmful neuron, such as oxygen, heavy hydrogen, hydrogen sulfurous gas, nitric oxide, various hydrocarbon gases and ammonia. The nanowire semiconductor gas sensitive material has the beneficial effects that the size of a carrier nanowire is easy to manufacture, the thickness of the Ga2O3 sensitive material obtained through oxidation is 5-20nm, which approximates to the size of a debye depletion layer, so that response of high sensitivity to the gas is obtained, the problem of direction preparation of Ga2O3 nanowire with diameter of 5-20nm is solved, the preparation cost is further lowered, and the cost is saved.

The invention relates to the field of medical appliances, particularly a collecting device for collecting the body fluid. The fluid extractor for closed body fluid retention devices comprises an annular side wall and a channel assembly, wherein the annular side wall forms a channel; the channel assembly is arranged in the channel and positioned on the lower part of the channel; the channel assembly and annular side wall form a split fit; the channel assembly is provided with a through hole; the upper part of the channel is used for collecting the fluid; and the lower part of the channel is matched and connected with the channel assembly. The fluid extractor is capable of lowering the cost and enhancing the production efficiency; and when the excess fluid is poured out of the fluid extractor, the fluid in the test tube can be prevented from being poured out from the diversion channel or exhaust channel.

The invention relates to a preparation method of a sewage purification treatment material and a device thereof. The method comprises the steps of feeding powdered coke with small particle size into the device, and heating. The device comprises a roller positioned inside a heating chamber; one end of the roller is connected with a discharge pipe via a conical end; the other end of the roller is connected with a feed pipe; a plurality of rows of material turning over plates and material guide plates are fixed on the inner wall of the roller, each row of the material turning over plates and material guide plates are composed of a plurality of material turning over plates and a plurality of material guide plates that are alternately installed, and expansion gaps are arranged among the material turning over plates and material guide plates in the same row; spaces are left between every two rows of the turning over plates and material guide plates; each material guide plate is a triangular component composed of a flat surface and an inclined surface, the flat surface is arranged flush with the material turning over plates, and the tip ends of the material guide plates face the discharge pipe; a space is left between the middle part of the each material turning over plate and the inner wall of the roller; the discharge pipe is hermetically connected with a discharge chamber, and a vapor inlet port is arranged on the discharge chamber; the feed pipe is hermetically connected with a gas collection chamber; and a driving device is connected with the external part of the discharge pipe to drive the roller to rotate.

A vessel cap comprises a body mounted at a vessel inlet through which a liquid material stored in a vessel is discharged outwardly and having a certain space therein, a pressing plate disposed in the body to be movable in upperand lower directions, a cutter formed at an edge of a lower surface of the pressing plate in a circumferential direction for penetrating a sealing member when the pressing plate is pressed and cutting the sealing member when the body is rotated, a hooking member downwardly protruding at the lower surface of the pressing plate for storing the sealing member cut by the cutter in the body, and a connection portion formed between an outer circumferential surface of the pressing plate and an inner circumferential surface of the body for guiding the pressing plate to be moved in upper and lower directions. When the vessel cap is opened, the sealing member is automatically removed by a sealing member removing unit integrally formed at the vessel cap. Accordingly, a user's convenience is enhanced without additionally removing the sealing member. Furthermore, the vessel cap is manufactured by a single molding thereby to reduce a production cost.

The invention relates to a medical device, and especially relates to a device used for collecting a body fluid. The device is a fluid sampling member for a closed body fluid storage device, and comprises an annular sidewall A and an annular sidewall B; a flow guiding channel is formed by the annular sidewall A, and an air discharge channel is formed by the annular sidewall B; the upper portion of the annular sidewall B is not connected with the annular sidewall A, the minimum sectional area of the flow guiding channel is more than or equal to 3 mm<2> and less than or equal to 15 mm<2>; and the minimum sectional area of the air discharge channel is more than or equal to 3 mm<2> and less than or equal to 15 mm<2>. The device has the advantages of simplicity in processing, production cost reduction, high production efficiency, and prevention of backflow.

The invention relates to a traditional Chinese medicine composition for treating chronic gastritis and gastric precancerous lesions. The traditional Chinese medicine composition is prepared from the raw materials: cablin potchouli herb, coptidis rhizoma, bran-stir-fried macrocephalae rhizoma, fructus amomi rotundus, scutellariae barbatae herba, herba hedyotidis, angelicae sinensis radix, chuanxiong rhizoma, notoginseng radix et rhizoma, poria, stir-fried radix paeoniae alba, bulbus oculi, bran-stir-fried aurantii fructus immaturus, prepared cyperus rotundus, aucklandiae radix, fructus amomi, scorpio and prepared corydalis rhizoma. The composition is prepared into pharmaceutically acceptable dosage forms by being added with pharmaceutically conventional auxiliary materials according to a pharmaceutically conventional process. The traditional Chinese medicine composition has a definite curative effect on chronic gastritis, chronic atrophic gastritis and gastric precancerous lesions (suchas intestinal metaplasia and intraepithelial neoplasia) in clinical symptoms, histopathology and molecular level, and is convenient to take, carry and store and low in cost.