61results about How to "Extensive research" patented technology

The invention provides a three-level half-bridge single-stage inverter and a control method thereof, belonging to the inverter field. One passage of voltage output circuit of the inverter consists of a power (V in ), two capacitors (C11 and C12), six power switch tubes (S1-S4, S9 and S10), two clamping diodes (D1 and D2), a transformer (T1), a filter inductor (L f1 ) and a filter capacitor (C f1 ), and another passage of voltage output circuit of the inverter consists of a power (V in ), two capacitors (C21 and C22), six power switch tubes (S5-S8, S11 and S12), two clamping diodes (D3 and D4), a transformer (T2), a filter inductor (L f2 ) and a filter capacitor (C f2 ). The inverter is formed by the differential combination of two three-level half-bridge DC converters with bidirectional power currents; the switch tube has low voltage stress and is suitable for high-voltage input sites; the load adaptability is strong and the dynamical performance is excellent. The three-level half-bridge single-stage inverter has two control methods as follows: a no-bias voltage semi-period working mode with two passages of inverters work in a half period respectively and a bias voltage full-period working mode with two passages of inverters work at the same time.

The invention discloses a cantilever-beam electromagnetic-frictional-piezoelectric composite vibration energy harvester, and the energy harvester comprises a structural substrate fixed with an external excitation source, wherein the top of the structural substrate is connected with one end of a support beam elastic substrate. The top of one end of the support beam elastic substrate is movably connected with a cantilever beam elastic substrate, and the top of the other end of the support beam elastic substrate is sequentially provided with a frictional buffering layer and an electrode layer. The bottom of the other end of the support beam elastic substrate is provided with an electromagnetic induction coil, and the top of the other end of the cantilever beam elastic substrate is provided with a magnet. The bottom of the other end of the cantilever beam elastic substrate is provided with a frictional buffering layer, an electrode layer and a silica gel film layer, and the top of the cantilever beam elastic substrate is provided with a piezoelectric component. The energy harvester solves a problem that a conventional vibration energy harvesting device has a specific inherent frequency, and is low in energy utilization rate when the external excitation deflects from the specific inherent frequency.

The present invention relates to one kind of elastic conductive alloy and its preparation process. The alloy consists of Cu, Ni, Sn and rare earth element Y in certain proportion, and its preparation process includes smelting mother alloy, spraying deposited blank, rolling to deform, ageing and other steps. The alloy of the present invention has not only high strength, high hardness, high elasticity, good weldability, good platability and other advantages, but also excellent heat stress relaxation resistance, good conducting stability and excellent technological performance. It may be used in electronic industry to replace beryllium bronze in making various precise instrument elements.

The present invention discloses a feeder-layer-free human pluripotency stem cell culture medium, which contains L-ascorbate-2 magnesium phosphate, sodium selenite, recombinant human insulin, human apotransferrin, basic fibroblast growth factor, transforming growth factor beta 1, heparin lithium and/or heparin sodium, a DMEM/F-12 base culture medium and an osmotic pressure regulator. According to the present invention, with the culture medium, when the hiPSC culture is performed in low density and normal density, the proliferation rate is high, and the cell morphology and the pluripotency are well maintained; the use of the expensive heparitin sulfate is not required so as to substantially reduce the cost; and almost all of the hiPSCs maintaining cultures at the current stage can be met, and various small molecule compounds are added to perform induction reprogramming culture (removal of TGFB1 and DM), such the culture medium is suitable for extensive researches of various basic scientific researches and clinical scientific research experiments.

The invention relates to a method for preparing a zirconia heat insulation material by using eiderdown as a template, and belongs to the field of material science; natural eiderdown is used as a preparation template, and a zirconium nitrate solution is used as a soaking agent; and a zirconia heat insulation material with a maintained eiderdown dendritic structure is prepared; the method comprisesthe following steps: preparing a Zr(NO3)4 solution with a concentration of 5-10%; soaking eiderdown in the Zr(NO3)4 solution for 5 minutes-48 hours by using a soaking method; drying the eiderdown soaked with the Zr(NO3)4 solution in an oven at a temperature range of 50-100 DEG C for 3-48 hours; sintering the dried eiderdown in a sintering furnace at a temperature range of 600-1000 DEG C so as to prepare the zirconia (ZrO2) heat insulation material with the original eiderdown dendritic structure form. The invention has a simple process, and the obtained ZrO2 has the original eiderdown dendritic structure, and has excellent heat insulation effect and wide application prospects.

The invention discloses a circulating pipe network water quality integrative simulation test system with multichannel flow switching and calibrating devices. The system comprises a water supply subsystem and an independent circulating pipe network subsystem, wherein the water supply subsystem comprises a first water supply water tank and a second water supply water tank; the first water supply water tank is provided with a water inlet, a water outlet and a chemical filling hole; the second water supply water tank is communicated with the first water supply water tank by a pipeline with a second valve and is provided with a water inlet, a water outlet and a chemical filling hole; the independent circulating pipe network subsystem is a loop comprising a main circulating pump, a multichannelflow switching and calibrating device and a high-level water replenishing and exhausting water tank which are connected in series by virtue of pipelines; the loop is connected with a first pipeline branch for realizing closed circulation, a water replenishing system, an emptying branch, a water quality online monitoring system and a temperature control system; and meanwhile, chemical filling systems are also connected on the pipeline of the independent circulating pipe network subsystem. All the components of the system cooperate with each other and the system has the advantages of high simulation degree and capability of simulating various working conditions of municipal water supply pipe network systems.

The invention provides an organic luminous material and a preparation method thereof, and relates to an organic silicon polymer. Raw materials of the organic luminous material comprise metallic organic substance and polycarbosilane. The preparation method comprises the following steps of: putting polydimethylsiloxane into a reaction kettle, heating the polydimethylsiloxane under the protection ofargon, inflating the argon to the reaction kettle, adding n-hexane into the reaction kettle to dissolve the product after the temperature in the reaction kettle is naturally cooled to room temperature, filtering the product, removing the n-hexane in vacuum to obtain the polycarbosilane, soaking the ground polycarbosilane into ethanol, flushing the insoluble substances by using the ethanol and then drying the insoluble substances in vacuum; and pouring the polycarbosilane powder and the metallic organic substance powder into a three-necked bottle, heating the mixed powder to between 150 and 160 DEG C under the protective atmosphere of argon, preserving the heat for 1 to 1.5 hours, heating the mixed powder to between 260 and 270 DEG C, preserving the heat for 1 to 1.5 hours, dissolving the product by using the dry n-hexane after the reaction is finished and the product is cooled, filtering the product to remove the insoluble substances, and finally distilling the product with reduced pressure to obtain the powdery solid organic luminous material.

The invention belongs to the technical field of veterinary biology, and particularly relates to a colon bacillus outer membrane protein monoclonal antibody and a preparation method and an application thereof. The antibody is prepared by taking cloned, expressed and purified taking avian pathogenic escherichia coli 78 (APECO78) outer membrane protein as an antigen immune BALB/c mouse with a hybrid tumor technology. The antibody has high specificity and high sensitivity, and an experimental basis is laid for future rapid and specific detection of colon bacillus infection with an immunology method. Meanwhile, as proved by an experiment, the monoclonal antibody disclosed by the invention has high neutralizing activity and protecting efficiency on colon bacillus infection of the same type, and can be used for preventing colibacillosis.

The invention discloses a circulating pipe network water quantity integrated simulation test system with a temperature control system. The system comprises a water supply subsystem and an independent circulating pipe network subsystem; the water supply subsystem comprises a first water supply tank and a second water supply tank, wherein the first water supply tank is provided with a water inlet, a water outlet and an agent injection port, and the second water supply tank is communicated with the first water supply tank by using a pipeline with a second valve and provided with a water inlet, awater outlet and an agent injection port; the independent circulating pipe network subsystem is a loop comprising a main circulating pump, an electromagnetic flow meter and a high-level water supply and exhaust water tank connected in series through a pipeline; and the loop is connected with a first pipeline branch for realizing closed circulation, a water supply system, an emptying branch, a water quality monitoring system and the temperature control system. The pipeline of the independent circulating pipe network subsystem is connected with an agent injection system. The circulating pipe network water quantity integrated simulation test system with the temperature control system has the advantages of high simulation degree and capability of simulating multiple actual municipal water supply pipe network system working conditions by cooperation of the components.

The invention discloses a water quality comprehensive simulation test system with replacement pipe sections for a circulating pipe network. The system comprises a water supply subsystem and independent circulating pipe network subsystems. The water supply subsystem includes a first water supply tank and a second water supply tank communicated with the first water supply tank through a pipeline with a second valve. Each independent circulating pipe network subsystem includes a main circulating pump, a multichannel flow switch calibration device, a visible pipe section and a loop of a high water supplement and exhaust tank that are connected in series by a pipeline. The loop is in connection with a first pipeline branch for realizing closed circulation, a water supplement system, a blowdownbranch, a water quality on-line monitoring system, a temperature control system and replacement pipe section branches. Meanwhile, the pipeline of the independent circulating pipe network subsystem isalso connected to a reagent filling system. Making use of the interaction among all parts, the water quality comprehensive simulation test system for a circulating pipe network has the advantages of high simulation degree and ability to simulate the working conditions of a plurality of municipal water supply pipe networks.

The invention provides a portable far-infrared limb vascular puncture auxiliary system. The portable far-infrared limb vascular puncture auxiliary system comprises an infrared emitter, an image pickup system and a monitor; the infrared emitter comprises a plurality of infrared LEDs, an aluminum substrate, a condenser lens, an LED constant current control circuit drive board and two direct current power supplies. More than one infrared LED is welded at the front side of the aluminum substrate; the condenser lens is arranged at the front side of the aluminum substrate; the LED constant current control circuit drive board and female contacts of two direct current power supplies are arranged at the back of the aluminum substrate; the image pickup system is an infrared sensitive video camera provided with an infrared low-light lens; and the image pickup system is electrically connected with the monitor. By using the infrared sensitive video camera provided with the infrared low-light lens, even at severe environment, the invisible infrared radiation light can be sensed and converted into a measurable signal to assist the puncture.

The invention discloses a preparation method for preparing a microelectrode array based on a photoetching technology and preparing an electrochemical nonenzymatic biosensor by modifying the microelectrode array with a conductive element and an inorganic sensing coating layer, and relates to the field of macromolecular material science, photoetching technologies, electrochemical sensors and the like. Photoresist adopted in the preparation method can realize preparation of the microelectrode array with ultrahigh length-diameter ratio; a three-dimensional structure is developed on the basis of atwo-dimensional planar structure, so that the specific surface area of the coating layer is greatly enlarged, and a foundation is laid for the preparation of a high-sensitivity electrochemical sensor;meanwhile, the three-dimensional microarray structure improves the coarseness of the surface of the coating layer, and the effective load of a sensing coating layer is facilitated. A method for in-situ electrochemical reduction of inorganic transitional metal nano particles in the invention realizes preparation of an inorganic sensing coating layer having an electrochemical response, and has a synergistic effect together with a conductive microelectrode array. The technology disclosed by the invention is easy and convenient to operate; the constructed sensor has the advantages of high sensitivity to an object to be analyzed, high stability and the like.

The invention discloses a novel system for transferring a biocatalytic substrate based on high-molecular materials, wherein the system is composed of the following components by weight: 9-66.7% of the substrate and 33.7-91% of the high-molecular material. The system can effectively store high density substrate, can control the substrate to be slowly released in a water solution in a long time, and alleviates substrate inhibition. The invention further relates to several method for preparing the system for transferring the biocatalytic substrate, and an application of the transferring system for L-homophenylalanine synthesis reaction, wherein the substrate concentration reaches to 500mM, a 33h conversion rate reaches 79.1%. The system can effectively alleviate substrate inhibition, enables the substrate concentration raises 3 times, and has an important application value.

The invention provides a preparation method of a phosphonitrile polymeric flame retardant. According to the method, from a molecule design angle, two specific substituent groups are introduced on phosphonitrilic chloride trimer, a ring phosphonitrile derivative with polyhydroxyl is obtained, and through a polyaddition reaction of the derivative and isocyanate, the polymeric flame retardant with aphosphonitrile ring is synthesized. The phosphonitrile polymeric flame retardant is used for flame-retardant modification on materials such as polyurethane and is efficient and environmentally friendly, and the compatibility of the flame retardant and the materials is good. According to the technical scheme, aryloxy or alkoxy and ethylene glycol single sodium with different molar ratios are used as nucleophilic agents, two or more hydroxyl functional groups are introduced to the phosphonitrilic chloride trimer and further react with diisocyanate, and phosphonitrile polyurethane is synthesized.The phosphonitrile polyurethane is used as the polymeric flame retardant for modifying thermoplastic polyurethane (TPU), the LOI value of modified TPU reaches 27.7%, and the flame-retardant level reaches UL94V-0.

The invention discloses a method for returning straws to a field. According to the method, straws are collected, naturally dried and crushed; the crushed straw is soaked in a treatment solution; filtering is carried out, and the soaking solution is removed; the straw is steamed; the steamed straw is buried in field ditches; an organic fertilizer is applied, and soil is used for covering and is compacted. According to the invention, the straw is crushed, soaked in the treatment solution and is steamed; a composite synergist (o-nitro phenol sodium, polyaspartic acid, potentilla anserine, gibberellin, hydroxyacetamide, and sodium tripolyphosphate) is added to the organic fertilizer; with microbes in the soil, lignin in the straw can be fully degraded, and straw decomposition efficiency is greatly improved. Therefore, straw returning time is shortened, and the occurrence of wheat root diseases under a corn straw returning condition is reduced.

The invention discloses an angiogenesis inhibitant, which has an amino acid sequence selected from SEQ ID NO.1 and SEQ ID NO.2 and a molecular weight of 25000-35000 Dalton measured by a non-reducing SDS-PAGE (sodium dodecyl sulfate polyacrylamide gel electrophoresis) method. The purification method comprises the steps of: first dissolving agkistrodon acutus venom in a buffer solution, conducting centrifugation so as to take supernate; subjecting the obtained supernate to anion exchange chromatography so as to obtain an angiogenesis inhibitant crude solution; then coupling a monoclonal antibody secreted by a hybridoma cell strain 1B9 (CCTCC C200970) with an affinity chromatography vector so as to prepare an immune affinity chromatography column; finally purifying the crude solution with the obtained immune affinity chromatography column, thus obtaining the angiogenesis inhibitant. The angiogenesis inhibitant of the invention can be prepared into powder injections for injection, and has an anti-angiogenesis activity, especially angiogenesis related to tumor growth, and also has an obvious effect in tumor resistance and tumor metastasis resistance.

The invention discloses a high-temperature-resistant fiber filtering material for purifying industrial flue gas, and belongs to the technical field of air purification. The fiber filtering material contains a dust facing surface fiber layer, a base cloth layer and a gas purifying surface fiber layer, wherein the dust facing surface fiber layer is made from composite fiber filtering materials which are prepared through the step of performing mixing, extruding and granulation on modified nano sepiolite, polyphenylene sulfide slices and a high-temperature antioxidant P-EPQ through a twin screw extruder, and PTFE emulsion coats the surfaces of the composite fiber filtering materials by a foam coating method, so that the diameters of filtering holes can be effectively reduced; the base cloth layer is made from fine polyphenylene sulfide fibers; and the gas purifying surface fiber layer is made from coarse polyphenylene sulfide fibers, so that the filtering resistance is not influenced, and the product abrasion resistance improved. According to the high-temperature-resistant fiber filtering material disclosed by the invention, the fact that sepiolite which is low in price is used for the flue gas filtering materials is a new breakthrough, besides, the purifying efficiency of industrial glue gas is improved, the dust removing times is reduced, the use temperature of the filtering materials is increased, and the service life is prolonged.

The invention discloses a Fe/PIL/MWCNTs fuel cell catalyst and a preparation method thereof, and belongs to the technical field of a fuel cell catalyst. A certain amount of poly(brominated 1-vinyl imidazole) ion liquid prepared through polymerization is dissolved into ethyl alcohol, and then acidized multi-wall carbon nanotubes are added to be stirred and dispersed, and next, a prepared ferric nitrate ethanol solution is dropwise added to the dispersion liquid to be stirred at a certain temperature for a certain time, and then, centrifuging, washing and drying are performed to prepare a Fe/PIL/MWCNTs catalyst precursor; and the precursor is sent to a tubular furnace to be subjected to high-temperature pyrolysis for a certain time at certain nitrogen flowing speed, and the obtained productis subjected to acid washing treatment in a dilute nitric acid solution, and then filtering, washing and drying are performed to obtain the Fe/PIL/MWCNTs catalyst. The preparation method is simple, and the prepared catalyst has relatively high catalytic activity and stability and has wide application prospect in the field of the fuel cell.

The invention discloses nanoparticles prepared by applying a microfluidic technology, a preparation method and device and application of the nanoparticles. The particle size of the nanoparticles is 175nm-225nm, the particle size dispersity is 15%-30%, and the electric potential is -25MV to -5MV. The method comprises the following steps: completely dissolving shellac in a polar solvent, and then, dissolving a medicine CAPE in the polar solvent to prepare an internal phase solution; dissolving Arabic gum in deionized water to prepare an external water phase solution; wrapping the internal phase solution in the external water phase solution, and preparing a nanoparticle solution by adopting a one-step method device; and carrying out rotary evaporation on the nanoparticle solution to remove the solvent from the solution, and carrying out drying, thereby obtaining the product. The nanoparticles prepared by the invention are loaded with the medicine CAPE and have good dispersibility and stability, the structure and activity of the encapsulated CAPE are protected in a stomach, and the encapsulated CAPE is specifically released in an intestinal tract region.

The invention discloses an application of indole-3-carboxaldehyde and its derivatives in the control of plant diseases caused by phytopathogenic fungi, and provides an application of the indole-3-carboxaldehyde or its derivative or pharmaceutically acceptable salts in the control of plant diseases caused by phytopathogenic fungi, or in the preparation of a pesticide for a biocontrol agent for controlling the plant diseases caused by phytopathogenic fungi. A result of antibacterial activity detection proves that the indole-3-carboxaldehyde and its derivatives have good inhibitory activity against the phytopathogenic fungi, have a good inhibitory effect on the growth and sexual cooperation of plant pathogenic fungi, and can block the formation of double-nuclear mycelia to prevent the phytopathogenic fungi from infecting plants, so the occurrence of plant fungal diseases is effectively inhibited, a reference is provided for the green control of the plant diseases caused by the phytopathogenic fungi, and the indole-3-carboxaldehyde and its derivatives have a wide application prospect.

The invention relates to a chemical method for preparing a halogenation methylamine lead photoelectric thin film in a large-area manner. The method comprises the steps that a substrate deposited with a simple substance lead thin film and halogenation methylamine are heated under the vacuum or negative pressure condition, a reaction vessel is filled with halogenation methylamine, under the condition at the temperature of 200 DEG C to 300 DED C, the reaction is carried out, the reaction time is smaller than or equal to 50 min, and the halogenation methylamine lead semiconductor thin film material CH3NH3PbX3 with the large grain, good crystallinity and the uniform surface is prepared on the surface of the substrate material in an original manner, X is equal to Cl, Br, I or combination of one or two. According to the method, the halogenation methylamine lead thin film can be rapidly prepared in the large-area manner, the prepared halogenation methylamine lead thin film is good in thickness uniformity, halogenation methylamine lead is good in crystal and large in crystal size, the diameter can reach 0.5 to 2 micrometers, preferably, the diameter can reach one to three micrometers, the problem that in the traditional method, the film formation grain is small is solved, and the method has the wide experiment device research and industrial application prospect.

The invention discloses a method of preparing a high-efficiency photocatalytic composite material, belonging to the technical field of composite materials. Bacterial cellulose and melt-blown polypropylene fiber nonwoven fabric are compounded to serve as a carrier of nanometer TiO2, so that the aggregation and inactivation of nanometer TiO2 particles are prevented, and the falling of a large amountof nanometer TiO2 particles is avoided; the advantages of the bacterial cellulose, the melt-blown nonwoven fabric and the nanometer TiO2 are combined, so that the utilization rate of light is increased; and at the same time, by virtue of the action of a large amount of hydroxyl groups on the surface of BC, the adsorption performance of the material can be improved, so that the material can be applied to the field of photocatalysis very well.

Packet forwarding apparatus comprising an input for receiving packets; a packet classifier arranged in operation to read a class indication in received packets and in dependence thereon to pass packets to a class-based policer associated with the class indicated; a plurality of class-based policers, each operable to assign a provisional indication to packets of said associated class in response to a measure of the load presented by packets of said class exceeding a predetermined class-based threshold; a multi-class policer operable to receive provisionally-indicated packets processed by said class-based policers, and to assign a congestion indication to packets having said provisional indication in response to congestion arising at said packet forwarding apparatus; and an output for presenting packets processed by said multi-class policer for onward transmission from said apparatus.

The invention relates to a compound recipe kidney-strengthening tablet for enlivening the spleen and strengthening kidney in the traditional technique field. The preparing method comprises the following steps: disintegrating rhubarb horsetails into the powder; collating after immersing; collecting the collation liquid; disintegrating radix salvia miltiorrhiza, astragalus root, extractum glycyrrhizae liquidum and hirudo into the powder; extracting with alcohol reflux; filtering; merging the filtering liquid and the collation liquid; mixing uniformly; concentrating into the dense plaster; getting the extract of five tastes medicine; adding fermenting Cordyceps sinensis bacterial powder, crystalline cellulose, sodium carboxymethylstarch, starch and dolomol; mixing uniformly; getting the product by pelleting. The invention can reduce BUN and SCr level, which improves plasma protein content, improves the nutrient state, accelerates the renovation and the reactivation of nephric tubule epithelial cell, corrects the metabolic disorder of amino acid, protein and lipid, adjusts the cell immunity, improves the immunity, protects and recovers the kidney function, and prevents secondary infection.