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Process for preparing bio-diesel-oil by using microalgae fat
InactiveCN1699516AQuality improvementGood application and market demandBiofuelsLiquid hydrocarbon mixture productionAlgaeBio engineering
The invention discloses a process for preparing bio-diesel-oil by using microalgae fat, which comprises charging a predetermined amount of methyl alcohol into micro-algae grease, heating to a predetermined temperature, at the presence of acid catalyst, producing biological diesel oil through reaction, which has a density of 0.864kg / l, a viscosity of 5.2X10-4 (40 deg. C), and a caloric value of 41MJ / kg.
Owner:TSINGHUA UNIV
Nano ceramic composite thin polypropylene multifunction fiber and preparing method
ActiveCN101070635AFunctionalImprove economyMonocomponent polyolefin artificial filamentProtective garmentCeramic compositeThermal insulation
The invention discloses nano-ceramic composite fine polypropylene fiber and the processing method. The fiber contains nano-ceramic powder with 12-45 of 300, polypropylene with 250-270 of 300, polyethylene wax with 2-18 of 300 by weight. The denier of the fiber monofilament is 0.5-1.5D, the breaking strength is more than 2.5cN / dtex. We can get the fiber by the step of nano-ceramic powder aqueous dispersion, pre-dispersed precursor, composite masterbatch, composite sections, and high-speed spinning. The nano-ceramic powder is made up of ZrO2, or ZrO2 and ZrC, or TiO2 and Ag+. This type of fiber can be made of various type of textiles, such as sports apparel, underwear, bedding, shirt, socks and so on. The textiles with the function of launch biological waves of energy, anti-UV, anti-bacterial, absorption and barrier the near-infrared. So that to make the textiles have the function of anti-bacterial, energy health, insulation sunscreen, regenerative thermal insulation, dry and comfortable and so on.
Owner:吴进前
High-order sigma-delta closed-loop accelerometer interface circuit capable of self-checking harmonic distortion
ActiveCN103178828AHigh precisionHigh application requirementsAcceleration measurementLogic circuit coupling/interface arrangementsWork statusPhysics
The invention relates to a high-order sigma-delta closed-loop accelerometer interface circuit capable of self-checking harmonic distortion, belongs to the field of MEMS (micro-electro-mechanical systems) inertial devices, and aims to solve the problem that the self-checking function of the existing accelerometer interface circuit mainly allows for self-checking on analog output accelerometer interface circuits and fails in self-checking on harmonic distortion for direct digital output closed-loop high-order sigma-delta accelerometer interface circuits. The high-order sigma-delta closed-loop accelerometer interface circuit capable of self-checking harmonic distortion comprises an accelerometer sensitive structure, a charge voltage converter, a preamplifier, a correlated double sampling and sample holding unit, a phase compensator, a self-checking unit, a primary integrator, a secondary integrator, a summation unit, a tertiary integrator, and a comparator. Operating states are selected through a switch of the self-checking unit. In the self-checking mode, the self-checking unit outputs equivalent acceleration signals to allow for self-checking. When external acceleration signals are checked, a mass block deviates from a balanced position and outputs charge signals to allow for checking on the external acceleration signals.
Owner:HARBIN INST OF TECH
Bioactive multilayer multiphase ceramic microsphere material and its preparation method and use
The invention discloses a bioactive multilayer multiphase ceramic microsphere material and its preparation method and use. The bioactive multilayer multiphase ceramic microsphere material comprises multilayer microspheres obtained by alternate wrapping of beta-tricalcium phosphate and calcium silicate respectively doped with foreign ions. The preparation method comprises the following steps of respectively dispersing the beta-tricalcium phosphate and calcium silicate powder respectively doped with the foreign ions into alginate hydrosol to obtain two types of paste, putting the two types of paste respectively into liquid storage tanks connected to two layers of coaxial tubular nozzles, synchronously injecting the paste in the liquid storage tanks to outlets of the two layers of coaxial tubular nozzles to obtain concentric multilayer paste liquid drops, and receiving the concentric multilayer paste liquid drops by an inorganic calcium salt aqueous solution, and carrying out drying and calcination. The bioactive multilayer multiphase ceramic microsphere material has the fast-slow alternative degradation rate characteristic in the normal liquid, and can release an inorganic ion composition with layer-by-layer degradation. Granularity, each-layer thickness and an inorganic ion release rate of the bioactive multilayer multiphase ceramic microsphere material can be controlled easily. The bioactive multilayer multiphase ceramic microsphere material can be used for bone defect repair and bone regeneration medical science.
Owner:ZHEJIANG UNIV
Method for preparing biology diesel oil by using amylum enzymolysis to cultivate heterotrophy alga
InactiveCN1446882AReduce manufacturing costHigh yieldLiquid hydrocarbon mixture productionBio-feedstockBiodieselLower grade
A process for preparing biologic diesel oil from starch includes enzymolyzing low-grade starch to obtain aqueous solution of glucose, preparing culture madium, heterotrophic transfer to obtain heterotrophic chlorella, and fust pyrolysis to obtain biologic diesel oil. Its advantages are high output rate, quality and heat value, and high flowability.
Owner:TSINGHUA UNIV
Fuel filter integrating automatic water drain valve
InactiveCN103216367AAchieve maintenance-freeLower requirementMachines/enginesLiquid fuel feedersOutfallFuel filter
The invention aims to provide a fuel filter integrating an automatic water drain valve, so as to solve the problem of inconvenient water drainage of an existing fuel filter. The fuel filter integrating the automatic water drain value aiming to achieve the purpose comprises a filter element and a water collection container which is arranged below the filter element, and is characterized by consisting of an electromagnetic valve, a controller and a water sensing unit; the electromagnetic valve is arranged in an outfall at the bottom of the water collection container; the water sensing unit detects a water signal; the water signal is transmitted to the controller; and the controller controls a current signal to the electromagnetic valve according to the water signal, so as to start the electromagnetic valve.
Owner:PARKER HANNIFIN FILTRATION PROD & SYST SHANGHAI CO LTD
Preparation method of fluorocarbon compound liposome
InactiveCN102988294AImprove stabilitySmall particle sizeRespiratory disorderIn-vivo testing preparationsCholesterolOrganosolv
Owner:SHANGHAI NAT ENG RES CENT FORNANOTECH
Method for transmitting IP and CAN services on FC network
ActiveCN107483370AGood application requirementsImprove usabilityTime-division multiplexData switching networksData transmissionComputer hardware
The invention discloses a method for transmitting IP and CAN services on an FC network, and relates to the field of FC network transmission. The method comprises the steps that: (1), a kernel module is constructed on an HBA card; and the kernel module is initialized according to a configuration file and configuration software, so that initialization information is obtained; (2), an FC interface layer encapsulates an Ethernet frame or a CAN frame into an FC-AE-ASM frame according to the initialization information, and sends the FC-AE-ASM frame to the HBA card, so that the HBA card is enabled to send data; and (3), an FC interface layer receiving module decapsulates the FC-AE-ASM frame into the Ethernet frame or the CAN frame by utilizing a data difference frame type, and sends the Ethernet frame or the CAN frame to a corresponding upper protocol stack and CAN protocol software. According to the method disclosed by the invention, the HBA card is used as physical transmission equipment; due to design of the kernel module, the configuration software and the FC interface layer, transmission of IP and CAN services on the FC network can be realized; the usability of an FC-AE network data transmission programming interface is improved; simultaneously, application requirements of the IP services and the CAN services in a high-reliability control network are expanded; a scheduling buffer mechanism is arranged; and thus, zero packet loss in UDP transmission is realized by utilization of an FC-AE underlying flow control mechanism.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
Large-scale MIMO active antenna array applied to 5G millimeter wave communication
ActiveCN109980365AReduce mutual interferenceImprove consistencyParticular array feeding systemsRadiating elements structural formsMultiplexingControl power
The invention discloses a large-scale MIMO active antenna array applied to 5G millimeter wave communication. The large-scale MIMO active antenna array comprises an antenna array, a multifunctional board, a multi-channel TR module and a wave control power supply module, wherein the antenna array is correspondingly arranged on the multifunctional board, and the multi-channel TR module and the wave control power supply module are fixed on the multifunctional board and connected with the antenna array; the invention adopts a large-scale array antenna technology to achieve directional signal transmission, utilizes the directional gain of the phased array antenna to offset the space path loss of the signals, and utilizes the characteristic of dynamically adjustable beam pointing of the phased array antenna to achieve the multiplexing of the space dimensionality of the signals to greatly reduce the mutual interference among users, powerfully improve the capacity of the system and achieve low-power and high-efficiency signal transmission.
Owner:CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
Laser radar system and detection method
ActiveCN111896933AGood application requirementsGood application effectWave based measurement systemsICT adaptationRadar systemsEngineering
The invention relates to a laser radar system and a detection method. In the laser radar system, a transmitting module comprises at least one transmitting unit used for transmitting emergent laser. The detection module at least comprises a first detection unit and a second detection unit. The first detection unit is used for receiving echo laser returned by an object in a first field angle after reflection; and the second detection unit is used for receiving echo laser returned after the object in the second field angle is reflected, and the distance measurement range in the second field angleis greater than the distance measurement range in the first field angle, so that reasonable division of the whole field of view of the detection area can be realized. Therefore, the laser radar system can improve the range finding range in the second field angle while guaranteeing the range finding range in the first field angle, thereby improving the overall detection performance of the laser radar system. And the processing module is used for processing the echo laser received by the detection module so as to realize detection of a target in a detection area.
Owner:SUTENG INNOVATION TECH CO LTD
Semi-conductor surface emitting laser and production method and applications thereof
ActiveCN103208741ALower core layerHigh heat dissipation coefficientLaser detailsSemiconductor lasersBenzeneCapacitance
The invention relates to a semi-conductor surface emitting laser and a production method and applications thereof. An active layer utilizes a strain five quantum well; a lower DBR (Distributed Bragg Reflector) layer utilizes a binary N type AlAs / GaAs pair; an upper DBR layer utilizes a DBR of a general ternary N type Al0.92Ga0.08 As / Al0.12Ga0.88As; a plurality of pairs under the active layer utilize a same structure; the top utilizes a high thermal conductive ALN (Aluminium Nitride) layer; copper layers are arranged and covered on bilateral sides of the platform surface and above the platform; the size of an oxidation hole is 18 micron; and the capacitance of components are reduced through a BCB (p-bis benzene) layer. The production method of the semi-conductor surface emitting laser has the advantages of improving an integral heat dissipation level by improving processes, effectively solving the heat dissipation problem of a large power surface emitting laser, improving an stage of the power of the surface emitting laser, enabling the surface emitting laser to be improved in material character, improving the service life and working reliability of the surface emitting laser and achieving free space communication within 1-3 km.
Owner:WUHAN TELECOMM DEVICES
Method for preparing natural alpha-linolenic acid from crude oil of idesia polycarpa var.vestita diels
InactiveCN102320953AQuality improvementHigh yieldFatty acid chemical modificationPreparation from carboxylic acid esters/lactonesOperabilitySilica gel
The invention discloses a method for preparing natural alpha-linolenic acid from crude oil of idesia polycarpa var.vestita diels and belongs to the fields of medicines, food and feed. The technology mainly comprises the technical processes of preparing mixed fatty acid, preparing fatty acid ethyl ester, performing urea clathration, performing silica gel column chromatography, drying under reduced pressure and the like. The method is characterized in that: enrichment is performed by a urea clathration method, so the improvement on alpha-linolenic acid content is facilitated, impurities are removed, loss is reduced, yield is increased and the burden of the subsequent operation is reduced; the clathration technical process is optimized by substituting ethanol for methanol, so toxic reagents such as methanol and the like are not used; purification is performed by a silica gel column chromatographic technology, so purity and quality of products are improved; the technical process is simple, convenient and economic, and is high in operability; the requirement on equipment is not high; most of the used reagents can be recycled, so cost is obviously reduced and the method is economic and environment-friendly; and the method is suitable for production of enterprises with different scales and has wide application prospect in the production of high-quality alpha-linolenic acid.
Owner:四川省毛叶山桐子科技股份有限公司
Kit for rapid detection of red tide algae in natural water sample
InactiveCN102373271AEasy to carrySimplify operation stepsMicrobiological testing/measurementRed tideAlgae
The invention, relating to a molecular biology technology, particularly discloses a kit for rapid detection of red tide algae in a natural water sample and a usage method thereof. The kit comprises a filter membrane, a reagent and a sample to be detected, wherein, the reagent comprises 0.05-0.2 mL of ddH2O, 0.2-0.4 mL of 95% ethanol, 1.5-2.5 mL of 20*SET buffer, 600-700 mu l of 5*SET buffer, 400-500 mu l of 1* SET buffer and 10-15 mu l of FITC labeled oligonucleotide probe solution. The kit is convenient to carry, and can be carried to the ships for detecting red tide algae in the natural water sample at any time. Simultaneously, the kit has the advantages of simple operation, time saving, and effectiveness, and has good application and market demands.
Owner:INST OF OCEANOLOGY - CHINESE ACAD OF SCI
Parallel operation robot with remote motion center
ActiveCN109009448AIncrease stiffnessImprove stabilitySurgical manipulatorsSurgical robotsSimulationPositioning system
The present invention provides a parallel operation robot with a remote motion center. The robot comprises a robot main body, a robot location system and an operation desk. The robot main body comprises two branch chains, a lead screw, a scalpel and a robot pedestal, the two branch chains are planar connection rod mechanisms and have the same structure to form a parallel mechanism. Each branch chain is driven by two motors, moving platforms at the tail ends of the branch chains are connected with the lead screw through a rotation pair and a screw pair, and the scalpel is installed at the tailend of the lead screw. Through an installation mode of the branch chains, it is ensured that the axis of the scalpel is located on an intersecting line of planes where the two branch chains are located, and the intersecting line passes through the remote center. The robot main body is installed on the operation desk through the robot positioning system. The device has three translation freedom degrees and one rotation freedom degree. The parallel operation robot with a remote motion center employs parallel configuration and is compact in structure, high in precision and good in stability.
Owner:TSINGHUA UNIV
Method for preparing linoleic acid from idesia polycarpa Maxium. Var. vestita Diels oil
InactiveCN101880601AQuality improvementLow costFatty acids production/refiningMixed fatty acidIdesia
The invention discloses a method for preparing linoleic acid from idesia polycarpa Maxium. Var. vestita Diels oil, which belongs to the fields of medicaments, food and feed. A technique comprises degumming of crude oil by an acid method, preparation of mixed fatty acid and extraction of the linoleic acid. The method is characterized in that: degummed oil is obtained by an acidic degumming method, so phospholipid is removed completely; direct soap treatment is adopted to reserve the free linoleic acid and avoid the yield loss and the process is optimized to avoid the utilization of a toxic reagent, so the linoleic acid with high quality and high conversion rate is obtained at last; at the same time, the process has a simple process and low requirement on equipment and the solvent can be effectively reclaimed, so the cost is obviously reduced; and therefore, the method has a wide application prospect in the production of the high-quality linoleic acid.
Owner:四川省毛叶山桐子科技股份有限公司
Preparation method of graphene/carbon dot/magnetic composite material
ActiveCN106653261AStrong magnetismPromote degradationInorganic material magnetismInductances/transformers/magnets manufacturePhotocatalytic degradationXylitol
The invention discloses a preparation method of a graphene / carbon dot / magnetic composite material. The preparation method comprises the following steps of S1, adding xylitol, lysine, serine and hydrogen peroxide into deionized water, performing ultrasound processing and performing microwave heating process; S2, adding a Fe salt and a Ni salt, performing ultrasound, adding a mixed acid, and performing backflow reaction; S3, performing dialysis to obtain a solution A; S4, placing graphene oxide in the deionized water, performing ultrasound dispersion, adding an additive B and hydrazine hydrate, and performing microwave hydrothermal reaction to obtain a reactant C; and S5, performing uniform ultrasound dispersion on the reactant C and the solution A, performing microwave hydrothermal reaction, and performing washing, freezing, drying and heat preservation under 250-300 DEG C, thereby obtaining the graphene / carbon dot / magnetic composite material. The graphene / carbon dot / magnetic composite material prepared according to the method has excellent magnetic performance, photocatalytic degradation and photocatalytic stability, the performances of graphene, carbon dots and a magnetic material are combined, through mutual effects, functions are versatile, and the application demand can be satisfied better.
Owner:SUZHOU FANGSHENG OPTOELECTRONICS CO LTD
Method for preparing high-activity gold/zinc oxide composite nanocluster by room temperature one-pot method
ActiveCN108262041ASimple and fast operationReduce energy consumptionWater/sewage treatment by irradiationWater treatment compoundsOxide compositeHigh activity
The invention relates to a method for preparing a high-activity gold / zinc oxide composite nanocluster by a room temperature one-pot method. The method comprises the preparation steps that under room temperature stirring condition, zinc chloride and sodium hydroxide water solutions are sequentially added into a water and glycol mixed solution; after the reaction is performed for 10 to 60 minutes, agold sodium chloride water solution is slowly added drop by drop; the reaction is continuously performed for 10 to 30 minutes; finally, high-speed centrifugal cleaning is performed to obtain the gold / zinc oxide composite nanocluster. The method has the advantages that the operation is simple and convenient; high speed and high efficiency are realized; the cost is low; the energy consumption is low; the raw materials are cheap and can be easily obtained; the large-scale production is easy, and the like. The obtained gold / zinc oxide composite nanocluster has the characteristics that the yield is high; the particles are uniform; the specific surface area is large; the goal consumption is little; the dispersion is easy; the stability is high, and the like. Excellent photocatalytic degradationcharacteristics are realized; the cyclic utilization for many times can be realized; important application values and wide application prospects are realized in aspects of photocatalytic pollutant degradation, photocatalytic hydrogen generation, environmental governance and the like.
Owner:UNIV OF JINAN
Method for preparing natural vitamin E from crude oil of Maoyeshan tung tree seed
InactiveCN102229593AQuality improvementEasy and economical to makeOrganic chemistryChemical recyclingSolventEthyl acetate
The invention discloses a method for separating, purifying and preparing natural vitamin E from crude oil of Maoyeshan tung tree seed, which belongs to the field of medicines, foods and feeds. The method mainly comprises the steps of preparing through a chromatographic column, eluting and concentrating a solvent, treating active carbon, decompressing, drying and the like, wherein the vitamin E inthe crude oil of the Maoyeshan tung tree seed can be directly eluted, separated and purified by using the chromatographic column and a petroleum ether-ethyl acetate system through a low-pressure chromatography; after being concentrated properly, the vitamin E is treated by the active carbon; and a high-quality natural vitamin E product can be obtained by being dried at low temperature in a vacuumway. The method has the advantages that: the content of the vitamin E in the crude oil can be directly improved from about 0.1% to above 70% through a few operation steps; simultaneously, the processis simple and has a few operation steps and low equipment requirement; a high-temperature heating process is unnecessary; the separation residue can be used in other purposes of the oil of the Maoyeshan tung tree seed; the method is applicable for enterprises of different scales to product; and the method has a wide application prospect.
Owner:四川省毛叶山桐子科技股份有限公司 +1
Capacitor inspecting method
InactiveCN104698305AGuaranteed application effectReduce calibration errorResistance/reactance/impedenceElectrical testingCapacitanceElectrical resistance and conductance
The invention discloses a capacitor inspecting method. The method includes: applying sine alternating currents with the frequency of 50Hz and voltage effective value of U to two ends of a loop formed by a to-be-inspected capacitor and a resistor R with known resistance; detecting the voltage UR at two ends of the resistor R; calculating the voltage UC at two ends of the to-be-inspected capacitor according to UC=U-UR; calculating the current I of a serial loop formed by the to-be-inspected capacitor and the resistor R according to I=UR / R; using the formula C=I / (UC*2 pi f) to obtain the capacitance C of the to-be-inspected capacitor according to the calculated UC and I; performing difference value verification on the capacitance C according the capacitance of a reference capacitor under the sine alternating currents with the frequency of 50Hz. By the method, verification errors can be reduced effectively, accuracy and practicality are achieved, actual application requirements can be satisfied conveniently, capacitor screening can be performed, and the application effect of the to-be-inspected capacitor is guaranteed favorably.
Owner:DALIAN DONGPU MECHANICAL & ELECTRICAL
Preparation method of embedded diamond-based silicon carbide composite substrate
ActiveCN113151898AHigh thermal conductivitySolve heat concentrationPolycrystalline material growthFrom chemically reactive gasesSic substrateComposite substrate
The invention relates to a preparation method of an embedded diamond-based silicon carbide composite substrate, and belongs to the field of semiconductor material preparation. The method comprises the following steps: firstly, adhering a temporary carrier to a silicon carbide (SiC) substrate plated with a Si coating, and then carrying out surface patterning and reactive ion etching on SiC to form a SiC layer with a pattern structure; and then depositing a layer of diamond on the surface to cover SiC, and grinding and polishing the surface of the diamond layer. Then, after the temporary carrier of the SiC substrate is removed, adhering the temporary carrier to the diamond side. After the original Si coating is removed through reactive ion etching, the temporary carrier on the diamond side is removed, and finally the embedded diamond-based SiC composite substrate is obtained. Heat can be quickly dissipated under the conditions of high power and high integration, meanwhile, the excellent performance of SiC and diamond serving as wide bandgap semiconductors can be fully played, and a preparation basis for the structural design of a wide bandgap semiconductor heterogeneous material is provided.
Owner:UNIV OF SCI & TECH BEIJING +1
GH4282 nickel-based high-temperature alloy bar and preparation method thereof
ActiveCN111118423AUniform fine grain structureImprove tissue performance uniformityTemperingIngot casting
The invention discloses a GH4282 nickel-based high-temperature alloy bar and a preparation method thereof, and solves the technical problems of coarse grain size and poor uniformity of an existing GH4282 alloy bar. The preparation method comprises the following steps: S1, heating a GH4282 nickel-based high-temperature alloy ingot casting; S2, carrying out primary upsetting and tempering on the ingot casting in the axial direction to obtain a blank, and carrying out primary hot drawing and tempering on the blank in the direction perpendicular to the axial direction; S3, carrying out secondary upsetting and tempering on the blank in the axial direction, and then carrying out secondary hot drawing and tempering in the direction perpendicular to the axial direction; S4, carrying out three-timeupsetting and tempering on the blank in the axial direction, and then carrying out three-time drawing and tempering in the direction perpendicular to the axial direction to obtain a bar blank; and S5, tempering the bar blank in the step S4, and then performing one-fire-diameter forging forming to obtain the GH4282 nickel-based high-temperature alloy bar. The invention further discloses the GH4282nickel-based high-temperature alloy bar prepared by the method. The GH4282 nickel-based high-temperature alloy bar has the advantage that the structure uniformity of the GH4282 nickel-based high-temperature alloy bar can be effectively improved, so that the performance of the GH4282 nickel-based high-temperature alloy bar is improved.
Owner:BEIJING CISRI GAONA TECH +1
Pulse air explosion-based soil deep loosening method
The invention discloses a pulse air explosion-based soil deep loosening method. The pulse air explosion-based soil deep loosening method achieves soil deep loosening through a continuous type spiral digging device which is powered by a driving motor; with no or little manual force, a digging barrel can automatically dig into soil in a spiral mode and then deep loosen soil through multiple and multi-point air explosion. Therefore, under the conditions of short processing time and low high-pressure air volume, the pulse air explosion-based soil deep loosening method has the advantages of being large in the number of deep loosened soil cracks, long in crack length, large in crack width, low in soil volume weight, large in total porosity, high in broken soil rate and soil loosening rate, uniform in deep loosening, good in permeability and the like.
Owner:CHENGDU ACAD OF AGRI & FORESTRY SCI
Laser reflection expanding cone and method for manufacturing same
InactiveCN101382454ALower energy depositionImprove the ability to resist laser radiation damagePhotometryOptoelectronicsLaser beams
The invention relates to a reflective beam-amplifying element applied to the measurement of intense laser parameters, and a manufacturing method thereof, comprising a cone body 1 which comprises at least two hollow conical surface reflecting sections 2 and at least one hollow cylindrical conical surface connecting section 3 used for connection two adjacent conical surface reflecting sections 2, the conical surface reflecting section 2 comprises one pyramid type conical surface reflecting section 21 and at least one cone type conical surface reflecting section 22, all the include angles between the conical surfaces of all the conical surface reflecting sections 2 and the incidence direction of a laser incident beam 5 are the same; and the outer surface of the conical surface reflecting section 2 is plated with a high reflecting film 4, thus solving the problems of difficult processing, poor reliability and poor expandability of the existing laser reflective amplified beams, and having the advantages of being suitable for different laser beam strength and convenient structural processing and the like.
Owner:NORTHWEST INST OF NUCLEAR TECH
Efficient pedestrian falling detection method based on image enhancement algorithm and human body key point positioning
InactiveCN111783702ASave human effortSave moneyImage enhancementImage analysisHuman bodyPedestrian behavior
The invention discloses an efficient pedestrian falling detection method based on an image enhancement algorithm and human body key point positioning. The efficient pedestrian falling detection methodcomprises the following steps: (1) extracting pedestrian behavior video clips; (2) processing the image in the video; (3) detecting a person in the video segment; (4) capturing a picture of the tracking frame of the same tracked target person as a human body key point and obtaining position coordinates of 18 key points of the human body; (5) analyzing whether the target person falls down or not according to the positions of the key points in the step (4); (6) judging that the user falls down, storing a video segment, and sending alarm information; and (7) hearing the alarm prompt and taking corresponding measures by a user. According to the method, an image enhancement algorithm and human body key point positioning are combined, existing manpower, material resources and financial cost canbe greatly saved, rapid response is made for timely obtaining pedestrian falling information, and the method has high application requirements and market prospects in the field of social public safety.
Owner:HANGZHOU XUJIAN SCI & TECH CO LTD
Phenolic resin based friction material for ultrasonic motors and preparation method thereof
InactiveCN106566471AImprove carrying capacityImprove wear resistanceOther chemical processesAluminum silicateElectric machinery
The invention discloses a phenolic resin based friction material for ultrasonic motors. The phenolic resin based friction material is prepared from the following components by mass percentage: 55-70% of phenolic resin; 10-20% of aramid fiber; 10-20% of aluminum silicate; 0-10% of copper powder; and 0-10% of graphite. The invention also discloses a preparation method of the material. The method includes: subjecting uniformly mixed materials to hot press molding, then slicing the hot press molded material and applying the obtained material to ultrasonic motors. The friction material prepared by the method has good comprehensive performance, can meet the use requirements of ultrasonic motors under the harsh environments of a wide temperature range, ultralong service life requirement, and large load, etc., and broadens the application requirements of ultrasonic motors in aerospace, precise instruments and high-end equipment. Also the method is simple and reliable, and the prepared material has stable properties, therefore the phenolic resin based friction material is an ideal friction material for ultrasonic motors, and the method is a reliable preparation method.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method for preparing Fe-encapsulating metal carbon onions with even particle size through macroscopic quantity
ActiveCN106041126AEasy to synthesizeLow costTransportation and packagingMetal-working apparatusRefluxCentrifugation
The invention discloses a method for preparing Fe-encapsulating metal carbon onions with even particle size through the macroscopic quantity and relates to a method for preparing the Fe-encapsulating metal carbon onions. The problems that an existing method for preparing the Fe-encapsulating metal carbon onions is high in cost, low in yield and purity, rigorous in reaction condition, and large in harm to environment and testers, and the product appearance is difficult to control are solved. The preparation method comprises the steps that 1, prussian blue is heated and split; 2, heating reflux is conducted in diluted hydrochloric acid, and then centrifugation, washing with distilled water and drying are conducted; and 3, annealing is conducted in a muffle furnace. The method has the advantages that the cost is low, the yield is high, the reaction conditions are mild, and harm to environment and testers is small. The method is used for preparation of the Fe-encapsulating metal carbon onions.
Owner:HARBIN INST OF TECH
Method for preparing biology diesel oil by using amylum enzymolysis to cultivate heterotrophy alga
InactiveCN1188491CReduce manufacturing costHigh yieldLiquid hydrocarbon mixture productionBio-feedstockBiodieselLower grade
Owner:TSINGHUA UNIV
Earthquake disaster risk assessment and economic loss prediction method
PendingCN112200399AAccurate assessmentEffective assessmentResourcesEarthquake intensityEarthquake disaster
The invention provides an earthquake disaster risk assessment and economic loss prediction method which comprises the steps of collecting disaster and non-disaster data sets P{i} with earthquake disaster levels greater than 5 in record history, wherein the disaster and non-disaster data sets P{i} include latitude and longitude coordinates (Xi, Yi) of earthquake happening places, earthquake magnitude Mi and earthquake intensity levels Di, the direct economic loss Li of the earthquake and the number Napi of earthquake affected population, and the method comprises other steps. According to the method, analysis modeling is carried out by combining historical seismic data, risk assessment is carried out on seismic information of a target seismic position and historical adjacent positions by adopting a probability statistics method, and direct economic loss prediction is carried out through a macroeconomic model if the target seismic position is judged to be disaster earthquakes. According to the method, the risk and loss of the target earthquake can be evaluated more accurately and effectively, and the method has high application requirements and prospects for research on countermeasures against earthquake disasters and guarantee of social public safety.
Owner:HANGZHOU XUJIAN SCI & TECH CO LTD
Y waveguide chip and device for high-precision modulation of fiber-optic gyroscope and manufacturing method
ActiveCN110082859AGood application requirementsSolve the problem of smaller quantization voltageMeasurement devicesOptical light guidesFiberGyroscope
The invention discloses a Y waveguide chip and a device for high-precision modulation of a fiber-optic gyroscope and a manufacturing method. Different modulation indexes are realized by designing a double-electrode structure, the length of the first electrode is m times of that of the second electrode, the phase change generated by the first electrode is m times of that of the second electrode. When the same phase modulation is realized by the double electrodes, the amplitude of the modulation voltage loaded on the second electrode is m times of that loaded on the first electrode, and therefore an effect of generating small phase modulation by larger modulation voltage can be realized, and a problem that a quantization voltage corresponding to 1 LSB is small due to increase of a digit of aDA converter is solved. By applying a modulation voltage signal to a first bonding pad in the first electrode and a fourth bonding pad in the second electrode, and grounding the second bonding pad inthe first electrode and the third bonding pad in the second electrode, a state of modulating the phase length can be realized. The scheme has universality, and the length proportional relation of thedouble electrodes can be adjusted according to the precision requirement of the fiber-optic gyroscope on a feedback phase
Owner:BEIHANG UNIV
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