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104results about How to "Strong repeatability" patented technology

Method for simulating biaxial test of braided composite material and determining material performance parameters by using finite element method

The invention discloses a method for simulating a biaxial test of a braided composite material and determining material performance parameters by using a finite element method. The method comprises the following steps: simulating a biaxial test of a material by using finite element software based on size and space distribution conditions of fibers and matrixes obtained by a polarizing microscope technology and performances of known component materials, and determining the damage mechanism and process of the material in the test process. The simulation result of the finite element software is compared with true data acquired by a biaxial testing machine, and when the simulation result is almost completely matched with the real data, the method is effective and feasible, and the material damage process simulated by the method is quite credible. The method is simple in operation and strong in repeatability and is suitable for various complex load conditions of the braided composite material, the mechanical response of the braided composite material under the complex load conditions can be accurately and comprehensively reflected, and particularly the microscopic damage mechanism and process of the material which cannot be observed in the test can be intuitively reflected.
Owner:HARBIN INST OF TECH

Waveform-variable automatic impact device for modal test

The invention provides a waveform-variable automatic impact device for a modal test, and belongs to the field of modal tests. The waveform-variable automatic impact device for the modal test mainly comprises a controller, a digital steering engine, a workbench, a crank-connecting rod mechanism formed by a crank disc and a connecting rod, an impact head device, a sensor, a connecting stud, a linear optical axis guide rail, lubricating components of various motion pairs, corresponding supporting and fixing components and the like, wherein the impact head device comprises an impact hammer cap for damping replacement and a hammer body. According to the invention, the instantaneous rotating speed of the intelligent steering engine is controlled through programming, specific impact waveforms such as triangular waves, pulse waves and the like are outputted, circumferential motions are transformed into reciprocating rectilinear motions by adopting a crank-guide rod mechanism, and the tail end of a guide rod is additionally provided with a hammer to output an exciting force. The contact time between the hammer and an excited portion can also be controlled, and the adjustability of an impact force and the impact time are ensured. A problem that manual knock contact is difficult in excitation time control, poor in repeatability and difficult to excite ideal pulse waves is solved.
Owner:HARBIN ENG UNIV

Coating device and coating method

The invention discloses a coating device and a coating method. The coating device comprises a needle head, a clamp, an imaging device, a height measurement device and a control device, wherein paint is sprayed on the needle head, the clamp is positioned under the needle head, and the clamp and the needle head can relatively move in a transverse direction and a longitudinal direction; the imaging device, the height measurement device and the control device are positioned above the clamp; the needle head can vertically move relative to the clamp; the needle head is connected with a flow control device, and the imaging device, the height measurement device and the flow control device are connected with the control device. During coating, the injection quantity of the paint of the needle head and the opening and closing of a valve are controlled through the flow control device. In the injection process, the control device controls the relative positions of the clamp and the needle head in the transverse direction and the longitudinal direction so as to ensure that the needle head carries out point injection according to a point injection track determined in advance, and controls the needle head to vertically move relative to the clamp so as to ensure that the distance between the needle head and the surface of a product to be coated is constant.
Owner:SWELL MARUI GUANGZHOU AUTOMOBILE PARTS

Calibrating device and method of vehicle profile dimension automatic measuring apparatus

The invention relates to a calibrating device and method of a vehicle profile dimension automatic measuring apparatus, and belongs to the vehicle measuring technical field; the calibration method comprises the following steps: allowing the calibrating device to use an industrial control computer to control a mobile dolly to travel, wherein the mobile dolly is configured with a calibrating plate rotating device; using a laser radar of the vehicle profile dimension automatic measuring apparatus to measure the horizontal distance between the radar and the calibrating plate; using a computer calibrating program to verify the distance measured by the laser radar and the mobile dolly travel displacement; and evaluating the vehicle profile dimension automatic measuring apparatus accuracy. The calibrating device comprises the mobile dolly configured with the calibrating plate rotating device, a customization guide rail, a drive unit, a slave unit, a telescopic scale and the industrial control computer; the calibrating device and method can accurately evaluate the measuring precision of the vehicle profile dimension automatic measuring apparatus measuring the vehicle length, width and height, and can evaluate a laser radar mounting position deviation and angle deviation, thus correcting the whole measuring apparatus. The calibrating method and device are high in detection precision, strong in practicality, and have very well practical values and promotion prospects.
Owner:JILIN UNIV

Insect epidermis cell line as well as construction method and use thereof

The invention provides an insect epidermal cell line and a construction method. The invention successfully overcomes the difficult problem that the epidermal cell tissue has a high differentiation degree, which is difficult to be cultured in vitro. The steps are that the cell culture solution is prepared firstly; then the insect larvae which enter into the molt cycle are selected for the dissection; the dorsal and abdominal epidermis on the body wall of the worm body is taken and rinsed; the dorsal and abdominal epidermis is minced into tiny tissue fragments which are cultured at 25 degree to 29 degree for the adherence to the wall; 1ml to 2ml cell culture solution is added after 1 hour; 1ml to 2ml cell culture solution is added again after 9 days to 11 days; 1:2 to 1:3 dilution subculture is conducted during the passage of generation every 15 days to 20 days; the serum content in culture solution is decreased to 10 percent to 20 percent at the sixth passage and the growth factor content is reduced to half of the original amount; the serum content in culture solution is decreased to 8 percent to 12 percent at the tenth passage and the growth factor content is deprived from the culture solution; the cell line is successfully constructed. The epidermal cell line which is constructed by the method can be passed continuously; the invention provides a large amount of insect epidermal cells for various biological researches.
Owner:SHANDONG UNIV

Specific primer and identification method for microsatellite markers of sea horses in coastal waters of China

The invention discloses a specific primer and an identification method for microsatellite markers of sea horses in coastal waters of China. The identification method comprises the following steps: firstly developing a plurality of sea horse microsatellite markers (SSR); then extracting a sea horse sample DNA; then carrying out PCR amplification on the sea horse microsatellite markers and positive control (a COI gene); carrying out agarose gel electrophoresis on a PCR product; and identifying according to strip type of a plurality of product strips. The identification method disclosed by the invention is not limited by morphological characteristics of the sea horse sample. Regardless of size, freshness or death, deformation and incompleteness of the sample, species identification of sea horses in coastal waters of China can be accomplished by a small amount of DNA, so that the identification method is strong in practicability. The identification method is clear in result, intuitive and clear, strong in repeatability and high in reliability, can be used for detecting a plurality of sea horses or types of sea horses at the same time, and is simple and convenient and efficient and convenient to operate, thereby providing a powerful tool for researches on biological resource survey, germplasm protection, ecoethology and the like on the sea horses in coastal waters of China.
Owner:SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI

Method for preparing thin films in different components and doping ratios through multi-target co-sputtering

The invention discloses a method for preparing thin films in different components and doping ratios through multi-target co-sputtering. Due to a traditional film coating means of a normal temperaturemagnetron sputtering film coating system, with V being a proportion, the manner of multi-target co-sputtering is introduced to prepare V thin films in different doping components and doping ratios; then an oxidizing annealing process is used for achieving preparation of VO2 thin films in different doping components and doping ratios, so that the phase transformation temperature of the VO2 thin films is adjusted, and wide application in the fields of uncooled infrared focal planes, optical switches, intelligent energy-saving glass and the like can be achieved. Doped atoms can be one or a combination of tungsten, molybdenum, titanium, tantalum, fluorine and niobium, and two or more can be selected for the number of target materials for use according to the specific condition. The method forpreparing the doped thin films through multi-target co-sputtering effectively avoids the problem that different doping components and doping ratios of a traditional sputtering method need a pluralityof different target materials, the preparation cost is greatly lowered, meanwhile, the flexibility and diversity of doping are improved, and the characteristic of being matched with a large-scale filmcoating production line is achieved.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI

Preparation method of grapheme-nanometer precious metal composite pipe

The invention discloses a preparation method of a grapheme-nanometer precious metal composite pipe. The preparation method comprises the steps: (1) immersing a metal wire in dilute nitric acid, placing the metal wire into anhydrous ethanol for ultrasound and then drying; (2) placing the dried metal wire into chemical vapor deposition equipment to grow grapheme on the surface of the metal wire, and obtaining a grapheme/metal wire composite structure; (3) depositing a nanometer precious metal particle coating on the grapheme surface of the grapheme/metal wire composite structure; (4) placing the composite structure obtained into etching liquid, removing the metal wire, then cleaning and drying to obtain the grapheme-nanometer precious metal composite pipe. The preparation method disclosed by the invention has the features of easy operation, high repeatability and no environmental pollution. The grapheme-nanometer precious metal composite pipe provided by the invention is high in mobility, mechanical strength, thermal conductivity and corrosion resistance, and is applied to the fields of microelectronics, transparent electrodes, organic photovoltaic devices, energy storage batteries, multifunctional composites, biomedicine, etc.
Owner:LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS

HPLC (High Performance Liquid Chromatography) analysis method for sodium 3,3'-dithiodipropane sulfonate

The invention discloses a HPLC (High Performance Liquid Chromatography) analysis method for sodium 3,3'-dithiodipropane sulfonate and belongs to the technical field of analysis. The HPLC analysis method is characterized in that a high performance liquid chromatograph with an ultraviolet detector is used for determining; octadecyl silane is taken as a filling column, the size of a chromatographic column is 250mm (length)*4.6mm (inner diameter) and the grain size is 5 microns; methyl alcohol and a buffer solution in volume ratio of (0-50):(100-50) is taken as a flowing phase; the detection wavelength is 190-330nm, and the column temperature is at 10-60 DEG C; the speed of the flowing phase is 0.3-1.2mL/min; the feeding size of a sample is 20 micro liter; the buffer solution contains 0.17mol/L acetic acid, 0.142mol/L triethylamine and ultrapure water. The content of sodium 3,3'-dithiodipropane sulfonate in a to-be-detected sample can be quickly and accurately measured according to a standard curve established via a standard solution; the determination result error is small; the repeated operability is strong; the precision is less than 2.8%; the recovery rate is 96.7%-99.3%; the HPLC analysis method can be widely applied to the production process detection and product quality detection for industrial sodium 3,3'-dithiodipropane sulfonate.
Owner:湖北吉和昌化工科技有限公司

Method for preparing CoFe alloy/graphene oxide/carbon nanotube composite material

The invention relates to a method for preparing a CoFe alloy/graphene oxide/carbon nanotube composite material. The method adopts urea to treat Fe and Co bimetals. The preparation method comprises thefollowing steps of: adding ferric salt, cobalt salt and urea into deionized water, and performing oil-bath mixing and stirring until drying; uniformly grinding the obtained powder and graphene oxidepowder; calcining under the condition of Ar2; heating to 550 DEG C at a speed of 3-10 DEG C/min, keeping the temperature for 2 hours, heating a tubular furnace to 600-900 DEG C at a speed of 3-10 DEGC/min, keeping the temperature for 2 hours, and naturally cooling to room temperature, thereby obtaining the oxygen reduction catalyst with the CoFe alloy/porous graphene oxide/carbon nanotube multi-dimensional composite structure. The preparation method is simple in preparation process and low in cost; the material has good structure uniformity, has the advantages of high crystallinity, excellentelectrochemical performance and the like, is used for preparing the oxygen reduction catalyst of a zinc-air cell cathode; and the defect that a noble metal catalyst is high in cost, complex in preparation process and difficult to industrialize is overcome.
Owner:UNIV OF SHANGHAI FOR SCI & TECH

Construction method for fat body cell line of chilo suppressalis larva

The invention discloses a construction method for a fat body cell line of a chilo suppressalis larva. The construction method for the fat body cell line of the chilo suppressalis larva includes the following steps: (1) a cell primary culture solution and a cell subculture solution are prepared; (2) a chilo suppressalis larva is soaked in an ethanol solution, surface sterilization is carried out, and the larva body is cleaned and dried through absorption; (3) the larva body is placed in a wax dissection tray disinfected with ethanol, and the chilo suppressalis larva is dissected; (4) a fat body tissue block is placed in a cell culture bottle filled with an HBSS cleaning solution, the cell culture bottle with the fat body tissue block stands still, and the process of pipetting the HBSS and adding fresh HBSS is repeated for three times after fat body cells become adherent; (5) the cell primary culture solution is added, the cell culture bottle is placed into a non-illuminated cell culture box for culture through the night, and then the cell subculture solution is added; (6) the cell subculture solution is pipetted and replaced every 7 days till the culture bottle is filled with expanded and reproduced cells. The construction method for the fat body cell line of the chilo suppressalis larva provided by the invention facilitates chilo suppressalis researches under an isolated culture condition, so as to provide help for the research and development of chilo suppressalis prevention and control methods.
Owner:CHINA JILIANG UNIV

Rare earth complex based on 2-HNCP and pyridine-3-carboxylic acid as mixed ligands, preparation method, structure and application of rare earth complex

The invention relates to a rare earth complex based on 2-HNCP and pyridine-3-carboxylic acid as mixed ligands, a preparation method, a crystal structure and an application of the rare earth complex. The molecular formula of the rare earth complex is [RE(2-NCP)2(3-pyc)]n. According to the preparation method, trivalent rare-earth salt, 2-HNCP and pyridine-3-carboxylic acid are mixed in the substance ratio being 1:(0.5-1.5):(0.5-1.5), a certain amount of water is added, the mixture is stirred for a period of time, pH of the mixture is regulated to be 5-8 with an NaOH solution, then the mixed solution is transferred to a reactor with a polytetrafluoroethylene liner, subjected to a reaction in a temperature range of 140-180 DEG C for a period of time and then cooled gradually to room temperature, a product is washed with water and aired at room temperature, and obtained bulk crystals are the rare earth complex. The rare earth complex is applied to aspects of catalysis of organic synthesis, selective adsorption and separation of CO2, CH4, H2, N2, O2 and other gas as well as selective adsorption, separation and photocatalytic degradation of organic dyes and phenolic endocrine disruptors. The synthetic method has the characteristics of high repeatability, high yield, stable product performance and the like.
Owner:JILIN NORMAL UNIV

Improved preparation method of kelp chromosome

The invention discloses an improved preparation method of a kelp chromosome. The steps are absorbing surplus moisture after kelp gamobiums are centrifuged, keeping the kelp gamobiums to be deposited, and adding colchicines solution for evenly shaking and stewing; conducting hypotension on the kelp gamobiums by using potassium chloride solution, fixing the kelp gamobiums by sing kano stationary liquid after hypotension, conducting enzymolysis and wall removal through mixed enzyme liquid of cellulose R-10 solution, pectinase solution and liquation enzyme R-10 solution, absorbing supernate by using a liquor relief gun after the kelp gamobiums are centrifuged, adding glacial acetic acid for evenly mixing to form cell suspension, absorbing the cell suspension by using a dropper to an upper dropping sheet of a centrifuging and pre-cooling glass slide, burning the bottom face of the glass slide by using an alcohol burner for one time, and naturally drying or stoving, dying the kelp gamobium chromosome adhered to the glass slide by using giemsa staining fluid, and observing and photographing under a microscope. The chromosomes obtained by using the improved preparation method are good in segregation, differentiable in shape and denumerable in chromosome split pahse, and the improved preparation method is simple and rapid in method, strong in repeatability and capable of opening in a general laboratory.
Owner:SHANDONG ORIENTAL OCEAN SCI TECH
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