31results about How to "Strong experimental operability" patented technology

The invention relates to a mathematics probability demonstration device, which effectively solves the problems of large workload and bigger artificial error in the existing needle throwing experimentdevice. The mathematics probability demonstration device is characterized in that the mathematics probability demonstration device comprises a simulation needle bar, a guide device and a needle throwing device, wherein the needle throwing device comprises a fixed casing; the outer side of the fixed casing is connected with fan blades; a cavity between every two fan blades forms a needle throwing cavity; both sides of each of the four needle throwing cavities are respectively sealed, and are integrally connected with the fixed casing; a first needle throwing hole is formed in the first needle throwing cavity and vertically faces the center of circle; a second needle throwing hole is formed in the second needle throwing cavity and slantwise faces the center of circle; a fourth needle throwing hole is formed in the fourth needle throwing cavity and slantwise faces the center of circle; the first needle throwing hole, the second needle throwing hole and the fourth needle throwing hole aremutually communicated; a blocking plate is arranged at an opening of the fourth needle throwing cavity, and the fourth needle throwing cavity is not sealed by the blocking plate; the outer wall of thefixed casing is connected with a first drive motor through a first rotary shaft; a floor box is arranged, and the experiment operability is stronger.

The invention discloses a drop test single-degree-of-freedom vehicle model-based vehicle parameter identification method, which comprises the following steps of: setting measurement points on a vehicle; identifying intrinsic frequencies of the vehicle under a no-load condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency by using a plurality of drop tests; adding mass onto a vehicle body, performing the drop tests respectively, and identifying intrinsic frequencies of the vehicle under a loading condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency; calculating the vertical stiffness of the vehicle body, the sprung weight of the vehicle body, pitching stiffness, pitching rotating inertia, side-tipping stiffness and side-tipping rotating inertia; calculating the stiffness Ksf of a front suspension and the stiffness Ksr of a rear suspension; calculating tire stiffness which is consistent with an actual stiffness result; and performing method accuracy verification. In such a way, requirements on test equipment are low, the tests are high in operability, the cost of a single test is lower, the accuracy is high, and a physical parameter calculation method is simpler.

The invention provides nucleic acid containing a photosensitive unit and a preparation method thereof. The preparation method comprises the step of preparing to obtain 2-nitrobenzene methyl-(4,4-dimethoxy triphenyl)ether-5-(2-O-cyanoethyl-N,N-diisopropylphosphoramidite). Phosphoramidite can be used for preparing the nucleic acid containing the photosensitive unit. The phosphoramidite is adopted toprepare the nucleic acid containing the photosensitive unit; experiments show that the phosphoramidite has high reaction acvity, favorable substrate adaptability, sufficient chemical stability and favorable light responsiveness when being used for preparing; a simple and high-efficient option is provided for the functionalization of the nucleic acid; the method for preparing the nucleic acid containing the photosensitive unit is simplified; the sensitivity of photodegradation is improved; the preparation cost is reduced; the market application of preparing the nucleic acid containing the photosensitive unit is enlarged.

The invention relates to an electrochemical preparation method of a fluorinated graphene material. The method comprises the steps that (1) carbon monofluoride is served as electrodes to be assembled as a battery, after the battery discharges, a pole piece containing the carbon monofluoride electrode material is taken out and subjected to ultrasonic exfoliation in an organic solvent, and fluorinated graphene is obtained; or (2) the fluorinated graphene material is obtained by electrolyzing carbon monofluoride, specifically, carbon monofluoride serves as an electrolysis electrode and assembled to be an electrolytic tank, the electrolytic tank is powered on and electrolyzed, and thus fluorinated graphene is obtained. The preparation method does not require high temperature and high vacuum conditions and special reaction instruments. The equipment and technology processes are simple, the operability is high, the used raw materials are cheap, the preparation cost is low, and the preparationmethod has the characteristics of being short in period and green and efficient. In addition, the obtained product is high in purity and less in number of layers.

The invention discloses a method for preparing porous graphite-phase carbon nitride nanosheet powder, which uses carbon-nitrogen precursors, carbonated beverages and water as raw materials, and uses carbonated beverages to assist hydrothermal treatment of conventional carbon-nitrogen precursors to prepare modified precursors; Then the above-mentioned modified precursor is calcined at high temperature to obtain porous g-C 3 N 4 Nanosheet powder. The present invention uses common carbonated beverages to assist hydrothermal modification of carbon-nitrogen precursors, and obtains porous g-C with nanosheet structure 3 N 4 Powder has the advantages of simple process, wide sources of raw materials, low cost, strong experimental operability, and no special requirements for equipment, and is suitable for large-scale industrial production. The resulting porous g‑C 3 N 4 The nanosheet powder has a significantly porous two-dimensional structure with a complete monolayer and uniform pore distribution, while improving the traditional bulk g-C 3 N 4 Non-porous, easy to agglomerate structural disadvantages; and exhibit good photocatalytic performance.

The invention provides an experimental device and experimental method for testing the interlayer bonding performance of a prepreg.The experimental device comprises a body mechanism, a guide mechanism and a stripping mechanism, wherein the body mechanism comprises a base, a control cabinet, a speed control part and a pressure control part, the guide mechanism comprises an upper guide plate, a lower guide plate and a mounting support, the stripping mechanism comprises a tensile testing machine, an upper chuck and a lower chuck, and the upper chuck and the lower chuck are located in the middle hollow-out region of the tensile testing machine.The experimental device and the experimental method for testing the interlayer bonding performance of the prepreg can conform to the actual situations of automatic laying projects of large composite material members and provide a reliable basis for selection of process parameters in the automatic laying process.

The invention provides a preparation method of maleimide, which comprises the following steps: S1, reacting maleic anhydride with p-methoxybenzylamine to generate 3-(4-methoxybenzylamino) acrylic acid; step S2, enabling the 3-(4-methoxybenzyl carbamoyl) acrylic acid to react with acetic anhydride, so as to generate 1-(4-methoxybenzyl) maleimide; and S3, removing the 1-(4-methoxybenzyl) group from the 1-(4-methoxybenzyl) maleimide under the action of an oxidizing agent, so as to generate the maleimide. The preparation method provided by the embodiment of the invention has the advantages of short experimental route, high raw material safety, strong experimental operability and suitability for industrial production.

A method for identifying parameters of a resonant fatigue crack propagation test vibration system based on a soft sensing technology comprises the following steps: 1, establishing a system three-degree-of-freedom vibration mechanical model to obtain a kinetic equation, and deriving to obtain a system frequency equation about a relationship among the system inherent frequency, the spring rigidity and the particle mass; 2, calculating according to a finite element technology to obtain the rigidity of a test piece under different crack lengths, and testing the system resonant frequency when a crack is propagated to different lengths; 3, substituting the system resonant frequency value and the corresponding test piece rigidity under different crack lengths into the system frequency equation in order to obtain overdetermined equations about the mass to be identified and unknown rigidity; 4, solving the overdetermined equations through a least squares technique to obtain nonlinear equations about the mass and rigidity; and 5, solving the nonlinear equations by using a Newton-Raphson formula, and identifying the vibration system parameters comprising the mass and the rigidity. The method has the advantages of good maneuverability, low cost and good accuracy.

The invention relates to a preparation method and application of a Vibro harveyi and Vibrio parahaemolyticus bigeminy DNA vaccine. The Vibro harveyi and Vibrio parahaemolyticus bigeminy DNA vaccine is characterized by being a tdh2-oppA fusion gene protein eukaryotic expression engineering vector vaccine formed by connecting a Vibro harveyi oppA gene with a Vibrio parahaemolyticus tdh2 gene through 6 nucleotides GAATTC. The preparation method comprises the steps of: cloning the tdh2 gene and the oppA gene into a linear vector Pmd19-T Simple; inserting the fusion gene into a eukaryotic expression vector pEGFP-N1 by adopting a double-enzyme cleavage technology to construct a pEGFP-N1-tdh2-oppA fusion gene protein eukaryotic expression engineering vector vaccine; and finally preparing a Vibroharveyi and Vibrio parahaemolyticus bigeminy DNA vaccine suspension by using a conventional method, and immunizing fishes by the dosage of 100 microlitres per fish. The invention has strong operability, high repetition rate, safety, no toxic or side effect, double immune protection for fishes and higher immune effect than an inactivated vaccine, a recombinant protein vaccine and a common DNA vaccine.

The preparation method and application of the bivalent DNA vaccine for preventing prawn white spot syndrome virus of the present invention are carried out in the design of primers. Double enzyme cutting site; when performing double enzyme cutting, the target gene can obtain sticky ends, and then use DNA ligase to serially clone the antigenic genes VP19 and VP28 into the prokaryotic expression vector for prokaryotic expression vector; in the construction of bivalent DNA For vaccines, VP19 gene modification is required, that is, the stop codon of the VP19 gene is removed through primer design; since the restriction site downstream of the VP19 gene is the same as the restriction site upstream of VP28 during primer design, the The VP19 gene and the VP28 gene can be cloned in tandem by enzyme cutting technology.

The invention provides a terahertz semiconductor laser device and a preparation method thereof and an application thereof. The terahertz semiconductor laser device comprises a first metal layer, a pressure welding metal layer serving as the bottom of the semiconductor laser device and a heat dissipation channel, a supporting substrate, a first highly-doped layer which is arranged on the supportingsubstrate and serves as a lower waveguide light limiting layer of the laser device, an active region growing on the first highly doped layer, a second highly-doped layer positioned on the active region, a plurality of electrical isolation trenches, an ohmic contact layer, an electrical isolation layer and a second metal layer. The terahertz semiconductor laser device is advantaged in that a periodic multi-ridge array and rectangular cavity coupling structure is adopted, and the beam divergence angle in the ridge width direction of the device is improved by means of the self-imaging effect caused by in-phase interference, by using a periodic multi-ridge array, the gain volume of the laser device is increased, and the output power is improved.

The invention provides a method for screening imbibition agents of low-permeability reservoir. The screening method comprises performing oil-sand imbibition effect testing on to-be screened low-permeability reservoir imbibition agents, so as to obtain first screening samples; performing adhesion-work reduction value testing on the first screening samples, and selecting the first screening samples with the adhesion-work reduction value larger than zero, so as to obtain second screening samples; performing emulsification stability and viscosity testing on the second screening samples, so as to obtain third screening samples; performing seepage-force testing on the third screening samples, and selecting the third screening samples with the seepage-forge value being 2 times or more larger than the seepage force value of simulated water or low-permeability reservoir produced water, so as to obtain an imbibition agent suitable for low-permeability reservoir; and finally finishing screening on the low-permeability reservoir imbibition agent after the imbibition agent is verified to be qualified through a rock core experiment. Through the above provided screening method, the obtained imbibition agent is applicable to common low-permeability reservoir, extra-low permeability reservoir and ultra-low permeability reservoir.

A high-power low-divergence-angle semiconductor terahertz vertical plane emitting laser comprises a highly-doped receiving substrate, a lower metal waveguide optical confinement layer, a lower contact layer, an active layer, an upper contact layer and an upper metal layer. The lower metal waveguide optical limit layer is formed by metal thermal bonding and located on the receiving substrate. The lower contact layer is located on the lower metal waveguide optical confinement layer. The active layer grows on the lower contact layer. The upper contact layer grows on the active layer and is made into a quasi-periodic geometric progression concentric circle grating structure. The upper metal layer is disposed on the upper contact layer through electron beam evaporation and made into a quasi-periodic geometric progression concentric circle grating structure. The lower metal layer and the lower contact layer form a lower plasma waveguide. The upper metal layer and the upper contact layer form an upper plasma waveguide. The upper plasma waveguide and the lower plasma waveguide form a double-sided metal waveguide structure. The lower contact layer, the active layer, the upper contact layer and the upper metal layer are made into an annular structure, and the annular active layer form an annular resonant cavity.

The invention discloses a preparation method of lamellar porous carbon nitride, which uses carbon and nitrogen precursors, dyes and water as raw materials, and adopts dye-assisted hydrothermal treatment of conventional carbon and nitrogen precursors to prepare modified precursors; then the above modified Precursors are calcined at high temperature to obtain lamellar porous carbon nitride. The obtained carbon nitride has an obvious two-dimensional lamellar porous structure with uniform pore size distribution, which not only effectively increases the specific surface area of ​​the material and thus increases the reactive sites, but also realizes the regulation of the energy band structure of the material and optimizes the optical efficiency. Reaction potentials for reduction and photooxidation, compared with conventional nonporous, agglomerated bulk g‑C 3 N 4 exhibited good photocatalytic performance. In addition, the present invention has the advantages of simple procedures, wide sources of raw materials, low cost, strong experimental operability, and no special requirements for equipment, which fully meets the current industrial-grade requirements of non-toxic, environmentally friendly, simple, and low-cost, and is suitable for large-scale industrialization Production.

The invention discloses a drop test single-degree-of-freedom vehicle model-based vehicle parameter identification method, which comprises the following steps of: setting measurement points on a vehicle; identifying intrinsic frequencies of the vehicle under a no-load condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency by using a plurality of drop tests; adding mass onto a vehicle body, performing the drop tests respectively, and identifying intrinsic frequencies of the vehicle under a loading condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency; calculating the vertical stiffness of the vehicle body, the sprung weight of the vehicle body, pitching stiffness, pitching rotating inertia, side-tipping stiffness and side-tipping rotating inertia; calculating the stiffness Ksf of a front suspension and the stiffness Ksr of a rear suspension; calculating tire stiffness which is consistent with an actual stiffness result; and performing method accuracy verification. In such a way, requirements on test equipment are low, the tests are high in operability, the cost of a single test is lower, the accuracy is high, and a physical parameter calculation method is simpler.

The invention relates to a mathematics probability demonstration device, which effectively solves the problems of large workload and bigger artificial error in the existing needle throwing experimentdevice. The mathematics probability demonstration device is characterized in that the mathematics probability demonstration device comprises a simulation needle bar, a guide device and a needle throwing device, wherein the needle throwing device comprises a fixed casing; the outer side of the fixed casing is connected with fan blades; a cavity between every two fan blades forms a needle throwing cavity; both sides of each of the four needle throwing cavities are respectively sealed, and are integrally connected with the fixed casing; a first needle throwing hole is formed in the first needle throwing cavity and vertically faces the center of circle; a second needle throwing hole is formed in the second needle throwing cavity and slantwise faces the center of circle; a fourth needle throwing hole is formed in the fourth needle throwing cavity and slantwise faces the center of circle; the first needle throwing hole, the second needle throwing hole and the fourth needle throwing hole aremutually communicated; a blocking plate is arranged at an opening of the fourth needle throwing cavity, and the fourth needle throwing cavity is not sealed by the blocking plate; the outer wall of thefixed casing is connected with a first drive motor through a first rotary shaft; a floor box is arranged, and the experiment operability is stronger.

The present invention provides a nucleic acid containing a photosensitive unit and a preparation method thereof, including preparing 2-nitrobenzyl-(4,4'-dimethoxytriphenyl) ether-5-(2-O-cyanide ethyl-N,N-diisopropyl phosphoramidite). Among them, phosphoramidite can be used to prepare nucleic acid containing photosensitive unit. In the present invention, phosphoramidite is used to prepare nucleic acid containing photosensitive units. Experiments show that it has high reactivity, good substrate adaptability, sufficient chemical stability and good light responsiveness during preparation, and is a functional nucleic acid. Chem provides a more concise and efficient option, simplifies the method for preparing nucleic acid containing photosensitive units, improves the sensitivity of photodegradation, reduces its preparation cost, and expands the market application of nucleic acids for preparing photosensitive units.

The invention relates to a method for synthesizing avapritinib. Compared with the existing synthetic route, which has many reaction steps and low yield, and needs to use a chiral column to resolve chiral compounds, the method of the present invention greatly reduces the number of reaction steps, improves the total yield of the reaction, and effectively The cost of the final product is reduced, and at the same time, it has good experimental operability.

The invention provides aminated fluorinated graphene and a preparation method thereof. A synthesis method disclosed by the invention does not require expensive raw materials, a complicated technologyand the like. Equipment and a technological process are relatively simple, the experience operability is strong, the preparation cost is low, and the period is short; in addition, the purity of an obtained product is high, and good synthesis basis is provided for further application of the aminated fluorinated graphene. The aminated fluorinated graphene in dozen-gram scale can be prepared in one time.

The invention relates to a method for preparing an antitumor drug darolutamide. A one-step Suzuki reaction is carried out, and then deprotection, hydroxylamine condensation and amide condensation reactions are carried out to obtain the darolutamide. The method has the advantages of few reaction steps, high reaction yield of each step, and simplicity in operation, so the total yield of the whole route is high, and the method has good experiment operationality.