57results about How to "Large loss" patented technology

The invention provides a method for preparing dental pulp mesenchymal stem cells and establishing a dental pulp mesenchymal stem cell bank and a cell resuscitation method, relating to a method for preparing a stem cell bank and a cell resuscitation method. The method comprises the following steps: opening the dental pulp cavity, carrying out primary culture on the dental pulp tissue by a pancreatin substitute half-digestion process, carrying out subculture to obtain dental pulp mesenchymal stem cells, carrying out biological nature detection on the prepared dental pulp mesenchymal stem cells, carrying out amplification culture, cryopreserving, and establishing the dental pulp stem cell bank. The pancreatin substitute half-digestion process for digesting the dental pulp tissue is different from the traditional digestion process; the pancreatin substitute is low in price and easy to purchase; and the half-digestion process effectively prevents the cells from loss and enhances the cryopreservation quantity of the cells. By using teeth as the tissue material source for preparing the mesenchymal stem cells, the invention provides opportunities for preserving dental mesenchymal stem cells.

The invention discloses a method for drying rosebuds and belongs to the technical field of rosebud drying through microwave vacuum and heated air circulation. A comprehensive method for drying rosebuds through microwave vacuum and heated air circulation comprises the following steps: (1) feeding the rosebuds to a heated air circulation dryer for drying; (2) feeding the rosebuds obtained in the step (1) to a microwave vacuum drier for drying. According to the comprehensive method, the temperatures are low during the drying processes, the drying time is short, the product quality is high, meanwhile energy consumption is lowered, and the production efficiency is improved. Besides, microwaves can effectively sterilize the rosebuds and kill worms' eggs attached to the rosebuds, and are beneficial for prolonging product shelf lives.

The invention relates to a log structure combination tree-based two-stage combination method. The method comprises the following steps of 1) selecting out a layer with most unreasonable spatial distribution in an open source system according to an imbalance score; 2) selecting out a target file in the layer with the most unreasonable spatial distribution according to a polling rule; 3) segmenting the target file into fragments according to lower layer files covering a same key value range, linking each fragment with the lower layer file of the corresponding key value range, and adding SliceLinks for each lower layer file; 4) checking a SliceLink quantity of each lower layer file, entering the step 2) if the SliceLink quantities of all the lower layer files do not exceed a preset threshold, and entering the step 5) until the SliceLink quantities of the lower layer files exceed the preset threshold; and 5) reading the lower layer files with the SliceLink quantities exceeding the preset threshold, and the target file having the corresponding key value range and linked with the fragments of the lower layer files into a memory of the open source system to perform combination to generate a new file, and writing the new file into a layer where the lower layer files are located. The method can be widely applied to the technical field of information storage.

A polymer ultraviolet-pH response p(AA-co-AAAB) copolymer aqueous gel is prepared by synthesizing molecular chain containing azobenzol group intermediate monomer AAAB and preparing p(AA-co-AAAB) copolymer aqueous gel by it. It has stable deformation and excellent ultraviolet response. It can be used for miniature optical devices, optical switches and sensors.

The invention aims to provide a novel wave-absorbing material and a preparation method thereof. The material is formed by interweaving nanoscale Fe@C and Fe3C@C nanocapsules and carbon nano tubes, and is prepared under working gas in situ by utilizing a plasma arc discharge technology, wherein a graphite electrode serves as a cathode, pure iron serves as an anode target, and the distance of 2-30mm is reserved between the cathode and the anode; the arc discharge current is 10-400A, and the voltage is 8-40V; and the working gases are argon, hydrogen and substance capable of providing the carbon element. Because the carbon nano tube grows on the surfaces of the Fe@C and Fe3C@C nanocapsules in situ in the preparation process, and the Fe@C nanocapsules and the Fe3C@C nanocapsules are connected, so that the nanocapsules are interwoven through a self-assembling mode, and finally the granular films and fibers with the macro scale are formed. The obtained granular films and fibers are in the whole 2-18GHz frequency band and have high dielectric constant and loss factor, so that the material becomes a novel nano wave-absorbing material which can absorb electromagnetic waves in the 2-18GHz frequency band.

The invention relates to the fine chemistry industry synthesis field, and especially relates to an environmentally-friendly synthesis method of vitamin E. The method comprises the following steps: adding 150-200 parts by weight of toluene into a reaction device, sequentially adding 40 parts by weight of 2,3,5-trimethylquinhydrone and 40-80 parts by weight of isophytol under mechanical stirring, slowly adding 1.5-2.5 parts by weight of magnesium chloride and 0.8-1.2 parts by weight of a magnesium oxide supported silica catalyst after the above obtained reaction system is fully dissolved and clear, closing the reaction system, allowing the reaction system to undergo a reaction under a vacuum degree of -0.07 - -0.05MPa at a temperature of 55-65DEG C for 1.5-2.5h, and allowing toluene reflux to be maintained and generated water to be distilled out with the toluene reflux in the reaction to be in favor of the implementation of the reaction; and recovering the catalyst and the above solvent, and carrying out reduced pressure distillation of the solvent-distilled reaction system to obtain a required pale-yellow oily vitamin E product. The method has the advantages of repeated use of the supported catalyst, high yield, low energy consumption and environmental protection.

The invention discloses a water-lubricated ship stern bearing capable of realizing automatic load balancing. The stern bearing comprises an inner rubber layer, a first metal shaft sleeve layer, a second metal shaft sleeve layer, a self-adaptive material layer and a third metal shaft sleeve layer from inside to outside in sequence, wherein the self-adaptive material layer is distributed between the second and third metal shaft sleeve layers; the thickness of the self-adaptive material layer changes in a gradient manner along the axial direction of the stern bearing; the stern bearing is adaptively cured and formed with the oblique degree of a ship stern shaft. The invention further discloses the materials and embodiments of work specifications of the self-adaptive material layer, the metal shaft sleeve layers and the inner rubber layer. According to the water-lubricated ship stern bearing capable of realizing automatic load balancing, the rubber layer at the inner side of the water-lubricated stern bearing is uniformly stressed; the bearing has the characteristics of compact structure, operation convenience and automatic load balancing; the control difficulty of abnormal abrasion noise of an existing ship stern bearing is effectively solved.

The invention discloses a method and a device for cyclically treating breeding wastewater and/or improving soil by utilizing livestock and poultry manure. The method comprises the following steps: adding a conditioner into livestock and poultry manure for mixing and conditioning; then pre-drying and dehydrating at low temperature to reduce the moisture content to be less than 10% to obtain dried livestock and poultry manure, indirectly heating the livestock and poultry manure in a pyrolysis and carbonization device, indirectly cooling the obtained charcoal powder, and adding the obtained cooled charcoal into breeding wastewater; and forming charcoal particles; the invention can be directly used for soil improvement; part of COD, ammonia nitrogen, phosphorus and other effective elements andantibiotics and other micropollutants can be pre-removed, and the biochemical treatment load of the aquaculture wastewater is reduced; or the invention is used for deep adsorption and purification ofaquaculture wastewater before tail water is discharged. According to the method and device, pollution caused by simple composting of livestock and poultry manure is avoided, comprehensive treatment of breeding waste is fully achieved, and good social benefits, economic benefits and environmental benefits are achieved.

The invention relates to a fiber composite material, and particularly relates to a fiber/long-carbon-chain nylon in-situ composite material and a preparation method. The fiber/long-carbon-chain nylon in-situ composite material comprises the components: 1-20wt% of high-performance fiber and 80-99wt% of long-carbon-chain nylon salt, preferably 5-16wt% of high-performance fiber and 84-95wt% of long-carbon-chain nylon salt, wherein the high-performance fiber is selected from at least one of aramid fiber, carbon fiber and fiberglass. The preparing process is simple; and the strength and toughness of the prepared fiber/long-carbon-chain nylon composite material are significantly improved as compared with those of the pure long-carbon-chain nylon prepared by the same process.

The embodiment of the invention discloses a signal processing device in a passive optical network, which comprises a first optical splitter 204, a mode coupling unit 203, an optical signal enhancing module 206 and a second optical splitter 202, wherein the first optical splitter 204 is used for combining multiple paths of uplink optical signals; the mode coupling unit 203 is used for performing low loss convergence on multiple paths of single-mode optical signals or single path of multi-mode optical signals by matching the modes of the uplink optical signals combined by the first optical splitter 204 according to the principle of optical field matching and convergence of multiple single-mode optical fibers; the optical signal enhancing module 206 is used for amplifying the optical signals converged by the mode coupling unit 203; and the second optical splitter 202 is used for combining the optical signals amplified by the optical signal enhancing module 206. The embodiment of the invention also discloses a passive optical network and a signal processing method. Therefore, the uplink optical power consumption can be greatly reduced, and a high optical power budget is obtained in a low-cost mode.

The present invention belongs to the field of wet treating process of nickel sulfide material, and is especially wet process of preparing nickel sulfamate with concentrated nickel sulfide ore. The process includes the following steps: pressure leaching the material with nitric acid; neutralizing and purifying with ammonium carbonate or ammonia water to eliminate Fe, Mn, Zn and other impurities; distilling ammonium nickel carbonate to eliminate ammonia; drying refined nickel carbonate; dissolving refined nickel carbonate in sulfonic acid; depurating nickel sulfamate with black nickel; and regulating nickel sulfamate solution. The present invention has simple technological process, low nickel loss, capacity of recovering Co and other valuable metals, low power consumption, low cost and other advantages.

The invention provides a superfine turbine classifier, which is characterized in that, the housing of a powder outlet chamber is connected on a classifying chamber, the powder outlet chamber is connected with a dust collector. A main shaft extends out from the upper part of the powder outlet chamber to be connected with a power mechanism, and is fixed in the powder outlet chamber via a bearing, abearing seat, and flanges. The main shaft extending into the classifying chamber is provided with a shaft sleeve connecting an upper plate of a classifying turbine assembly, the upper and lower ends of the classifying blades are respectively fixedly connected with an upper plate and a lower plate, each classifying blade is perpendicular to the horizontal and at an oblique angle with a radial plane, and the external shape of the classifying turbine assembly is a conical table. The lower end of the classifying chamber is connected with a powder mill. An inner sealing ring and an outer sealing ring of an annular sealing groove plate at the lower end of the housing of the powder outlet chamber are matched with an inner sealing blade and an outer sealing blade of the upper plate to form a mazesealing. The lower part of the lower plate of the classifying turbine assembly is connected with a flow guiding cover in the shape of an inverted conical surface. The main shaft drives the classifying turbine assembly to rotate, and the wind power of the classifying blades makes the powder spiral upward, fine powder ascends to the powder outlet chamber, and coarse powder descends to return to thepowder mill. The superfine turbine classifier is advantaged by high precision of classifying, no short-connection powder, small loss of system wind power, and no influence upon efficiency of the powder mill.

An electronic semi active control engine mount having a variable air chamber includes a variable air chamber diaphragm that absorbs the exciting force of fluid due to an external force by elastically deforming. An air chamber supports the variable air chamber diaphragm with the atmospheric pressure. A fork is separated from the diaphragm to keep the air chamber into which air flows in idling of an engine, and comes in close contact with the variable air chamber diaphragm to remove the air chamber into which the air flows when a vehicle is driven. An actuator either separates the fork from the variable air chamber diaphragm or allows the fork to be in close contact with the variable air chamber diaphragm.

A method for machining small-bore concave spherical crown or concave ball ring surface parts through a multi-magnet distributed annular magneto-theological polishing tool is characterized in that according to the size of the parts, a plane equivalent polishing tool and a test are prefabricated to determine the main process parameters, and permanent magnets are designed according to the process parameters and the structural shape of the parts and assembled into the annular magneto-theological polishing tool. Track simulation is conducted through the Matlab software to determine the rotation speed series capable of achieving axial and circumferential even removal. The parts and the annular polishing tool are subjected to sphere center positioning mounting, and the inclination angle alpha ofthe part axis and the tool axis is adjusted. According to the main process parameter values, a machine tool workpiece shaft and a tool shaft are started, and magneto-theological polishing liquid is continuously supplied to the machining area to conduct polishing machining on the concave spherical crown (concave ball ring surface) parts. The method can make the surface roughness achieve the nanoscale super-smooth surface, and achieves a better correction function for the surface figure accuracy (sphericity) of the parts.

Disclosed is a polishing unit wherein a main body part (11) and a lid (12) of a barrel tank (10) are respectively interchangeable, and the lid (12) and the barrel tank (10) can be reliably secured to the main body part (11) of the barrel tank (10) and the barrel tank case (20), respectively. The barrel tank (10) has a lid securing member (14) for securing the lid (12) to the main body part (11). The barrel tank case (20) includes a tray (21) for mounting and holding the barrel tank (10) thereon, a barrel tank securing member (22) for securing the barrel tank (10) to the tray (21), and a pair of guide parts (23) capable of moving the barrel tank securing member (22) in a horizontal direction. The barrel tank securing member (22) includes a pressing member (22a) which is placed over a position facing the tray (21) so as to be able to press the barrel tank (10) vertically downward and presses the barrel tank (10), and, as a positioning member which when the barrel tank securing member (22) is mounted, restricts the movement of the barrel tank securing member (22) using the guide parts (23) as a reference, a convex member (22c) and a protruding member (22d).

The invention provides a forming method of an aluminum extrusion. The forming method comprises the steps of: heating, temperature control, extruding through a die and setting, and specifically comprises the following steps of: heating, namely heating a raw material into a molten overheating melt raw material; temperature control, namely controlling the temperature of the molten overheating melt raw material and lowering the temperature until reaching a semi-solid state; extruding through the die, namely applying different pressures and flow rates to the raw material at the semi-solid state according to the thickness of the cross section of an extruded finished product, and passing through a pattern die; setting, namely drawing the extruded product passing through the pattern die, and cooling and setting the extruded product. The forming method of the aluminum extrusion has the advantages that the dimension of the raw material is unlimited, the width-to-thickness ratio of the extruded finished product is unlimited, the length is unlimited and the purpose of saving the energy consumption and minimizing extrusion equipment can be realized.

The invention provides a modified PP-R material for reducing low-temperature brittleness of PP-R and improving rigidity of PP-R material without influencing the toughness. The modified PP-R material comprises PP-R and dicumyl peroxide and is characterized in that the modified PP-R material contains 90 to 97wt percent of PP-R and 3 to 10wt percent of dicumyl peroxide. In the modified PP-R material, micro-cross-linking technology is utilized to influence the sequence structure of random polymer as well as the sequence structure of homo-polymerization section, so that the isotactic structure of PP main chain is reduced to influence the regularity of the chain and enhance the randomness of the main chain, thus enhancing the rigidity of PP-R and improving the mechanical strength of PP-R. Because the dicumyl peroxide belongs to thermoplastic material, the modified PP-R is recoverable and environment-friendly, and causes no pollution to the environment.

The invention discloses a method for synthesizing 2-mercaptosuccinic acid, relates to the technical field of fine chemical engineering, in particular to a method for preparing the 2-mercaptosuccinic acid. The invention provides a method for synthesizing the 2-mercaptosuccinic acid. For fulfilling the aim, the invention has the following technical scheme that: maleic anhydride and thiourea are taken as raw materials, and an intermediate compound, namely 2-amidinothioalkylsuccinic anhydride is synthesized through addition reaction; and under the alkaline condition, the 2-amidinothioalkylsuccinic anhydride is subjected to hydrolysis reaction to generate the 2-mercaptosuccinic acid.

The invention relates to a method for preparing p-xylylene dichloride by ultraviolet-induced catalysis, wherein the method comprises the following steps: step 1, adding p-xylene and a catalyst into areaction kettle, and slowly heating to a certain temperature; turning on an ultraviolet lamp, introducing chlorine gas from the bottom (or inserting a gas guide pipe into the bottom), and controllingthe introduction rate of the chlorine gas until a tail gas absorption liquid is slightly bubbled; when the temperature rises to 100 DEG C, heating is stopped, carrying out heat preservation, and introducing chlorine gas at the constant temperature for reaction; and after 5 hours, monitoring the reaction process by gas chromatography to obtain a high-temperature reaction solution; step 2, pre-adding a large amount of water into another kettle with strong stirring, and rapidly adding the reaction solution obtained in the step 1 into the water under strong stirring to form a large amount of whiteprecipitates; step 3, carrying out suction filtration, and rinsing the obtained white solid with water several times. and step 4, drying to obtain the target product p-xylylene dichloride.

The invention discloses a control system and method of a hybrid cascaded H-bridge rectifier, the output voltage ratio of which being 1: 2. By comparing total modulated wave vr1 and output vcmp of a cascaded unit 1:2 voltage division adjuster, a square wave output signal of a high-voltage unit modulator is obtained to drive a switching tube of a high-voltage unit H bridge; and a low-voltage unit modulated wave vr2 obtained after the total modulated wave vr1 subtracts the output signal of the high-voltage unit modulator 4) intersects with a high-frequency single-polarity triangular wave in positive and negative symmetry to obtain an output signal of a low-voltage unit modulator so as to drive a switching tube of a low-voltage unit H bridge. The method can obtain rectification voltage output,the voltage ratio of which is 1:2, so that the high-voltage unit switching tube having large voltage stress is allowed to work under a low frequency condition, switching loss can be greatly reduced,and meanwhile, the switching loss of a low-voltage unit having low voltage stress is also reduced; and high-frequency work can obviously reduce volume weight of a filtering device, and thus power density is improved.

The invention relates to a thermoplastic vulcanized rubber with high air barrier properties and a preparation method thereof. The thermoplastic vulcanized rubber with the high air barrier properties is mainly composed of raw materials including, halogenated butyl rubber, polyamide or EVOH (ethylene vinyl alcohol copolymer), bulking agent, vulcanizing agent and antioxidant, wherein the bulking agent is a glycidyl methacrylate grafted polyisobutene copolymer prepared from polyisobutene, glycidyl methacrylate, comonomers and initiator. The thermoplastic vulcanized rubber with the high air barrierproperties and containing polyamide or EVOH is prepared from a rubber-plastics premixture of polyamide or EVOH blended and grafted with the bulking agent and the halogenated butyl rubber, has a finemicro phase structure and is excellent in physical and mechanical property, air tightness, hardness and the like.

The present invention relates to a converter system of a switched reluctance generator, which is composed of a storage battery, twenty-two diodes, a three-phase winding, seven switching tubes, twelvecapacitors, two inductors and a bidirectional isolation converter. Under a converting structure comprised of the converter system, the enhanced excitation capability is realized by the automatic parallel excitation of two branch windings of each phase winding; the full-series high step-up output is realized by the automatic series generation of two branch windings of each phase winding in combination with the storage battery and related capacitors. Only one switching tube is needed in the process. An extremely high voltage can be directly output with the least switching tube; the storage battery can be charged automatically and the reverse energy feeding can be also realized in the same set of converting circuit; the level of intelligence is improved; and the demands that the system can still meet the requirement when more electric energy is needed on the load side of the output terminal of the converter system are adapted. The maximum withstand voltage of each switching tube in the whole system is low; the switching loss is low; and the switching tube is suitable for the application in the converter system of the switched reluctance generator under various power inputs and parallel connection or direct loads.

The invention discloses a barnacle glue protein dialysis process. The barnacle glue protein dialysis process comprises the following steps that a barnacle glue protein solution is added in a dialysisbag and dialysed with deionized water as a dialysate; during dialysis, the dialyste is magnetically stirred in the whole process; the dialysate is replaced multiple times during dialysis; during dialysis, colloidal proteins on the inner wall of the dialysis bag are continually collected until dialysis is completed. The invention further correspondingly provides a method for simultaneously collecting two differently types of proteins from a protein solution containing Trx-Balcp19k. According to the barnacle glue protein dialysis process, the replacement frequency and occasion of the dialysate are controlled, the colloidal proteins on the inner wall of the dialysis bag are collected in time so that a larger protein adsorption interface can be provided and more viscous colloidal proteins canbe obtained, and thus the gelatinize rate is higher. In addition, by the adoption of the barnacle glue protein dialysis process, the dialysis time is obviously shortened and can be shortened from original 12 h to 8-10 h under the condition of the same gelatinize rate.