15results about How to "Change mechanical properties" patented technology

The invention belongs to the technical field of cross culture of biological materials and organoids, and particularly relates to an ECM protein for three-dimensional culture of vascular organoids. HA-; the invention relates to a preparation method and application of Gel composite hydrogel. In order to solve the problems that in the 3D culture process of existing cell spheres or organoid spheres, matrigel derived from mouse sarcoma seriously depends on, components are undefined, the price is high, and immunogenicity exists, the composite gel with the definite components is provided and used for replacing Matrigel to conduct 3D culture of vascular organoids. The composite hydrogel prepared by the invention has the characteristics of short gelation time, good biocompatibility, adjustable gel components and the like under the synergistic effect of all the raw materials, can solve the problem of matrigel used for 3D culture of organoids, can replace the potential of matrigel in the future, reduces the price of 3D culture cell scaffold materials, and has broad application prospects. Meanwhile, the method can also be used in the regenerative medicine field of other two-dimensional or three-dimensional cell and organoid culture.

The invention discloses a reinforced flame-retardant regenerated polyester fiber and a preparation method thereof, and relates to the technical field of regenerated polyester fibers, the preparation method comprises the following steps: step S1, preparing a flame-retardant polymer by using bis (4-carboxyl phenyl) phenylphosphine oxide, 4, 8-tricyclo [5.2. 1. O2, 7] decane dimethyl carbinol and N-(4H-1, 2, 4-triazole-4-yl) diphenylamine-4, 4 '-dicarboxylic acid as monomers; step S2, preparation of flame-retardant master batch; step S3, spinning; and S4, (perfluoropropane-2, 2-diyl) bis (4, 1-phenylene) diacrylate and 3-[N, N-dimethyl-[2-(2-methylpropane-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt are adopted for surface modification. The reinforced flame-retardant regenerated polyester fiber has the advantages of favorable mechanical properties, favorable flame retardancy, favorable heat aging resistance and favorable environmental friendliness.

The invention belongs to the field of intelligent high polymer materials, and provides a rhodamine force-induced color-changing luminescent material as well as a preparation method and application thereof. The molecular formula of the rhodamine mechanochromic luminescent material is any one of the following # imgabs0 #, and the rhodamine mechanochromic luminescent material has the characteristics of various evolution forms, various luminescent colors and strong sensitivity control on external force response, and the mechanochromic high polymer material prepared from the rhodamine mechanochromic luminescent material has strong processing adaptability, and can adopt the current mature commercial processing preparation means. In addition, according to the preparation method of the rhodamine force-induced color-changing luminescent material, a commercialized polymer material can be adopted as a matrix, the processing and preparation process is simple, practicability is high, and large-scale preparation can be achieved.

The invention relates to the field of metal material surface modification, in particular to a method for improving the laser shock peening effect of nickel-based alloy through a pulsed magnetic field. Comprising the following steps: S1, carrying out multivariate analysis on a pulsed magnetic field process by adopting a support vector regression algorithm, establishing a relation model between magnetic field process parameters and the strength and plasticity of a nickel-based alloy sample, and carrying out key parameter identification on a regression fitting model of the support vector regression algorithm by utilizing a physical information neural network, the optimal pulsed magnetic field process parameters are obtained; s2, testing the elastic modulus and Poisson's ratio of the nickel-based alloy sample treated by the optimal pulsed magnetic field process parameters by using a static test method, and calculating laser shock parameters; and S3, the nickel-based alloy sample to be treated is subjected to pulsed magnetic field pretreatment under the optimal pulsed magnetic field technological parameters, and then laser shock peening treatment is conducted through the laser shock parameters at the same time. The uniformity and the influence depth of the surface strengthening effect of the metal material can be improved.

The invention discloses an implementation method for parallel execution of robot actions, and relates to the technical field of robot programming, the method comprises a programming stage, a compiling stage and an execution stage, the programming stage mainly comprises the following steps: framing a parallel statement execution area by adding a parallel start indication statement and a parallel end indication statement; the compiling stage mainly comprises the following steps of: adding grammar compiling of a parallel start indication statement, a parallel end indication statement and a parallel exit indication statement during compiling; and the execution stage mainly comprises the following steps: sequentially performing serial execution on the statement content of the serial statement execution area, and simultaneously performing parallel execution on the statement content of the parallel statement execution area. According to the method, during robot programming, robot parallel action programming can be effectively simplified, serial and parallel action programming layers are clear, and program management and maintenance are easy; and meanwhile, the operation complexity of the management and debugging robot is reduced, and the action execution flexibility is improved.

The invention discloses a structure for preventing a heat dissipation material from overflowing based on power semiconductor application. The structure comprises a power semiconductor module; the radiator is attached to the power semiconductor module and is used for radiating heat of the power semiconductor module; the heat dissipation material is arranged between the power semiconductor module and the heat sink and is used for conducting heat energy generated in the power semiconductor module to the heat sink; and the elastic sealing part is arranged between the power semiconductor module and the radiator by surrounding the periphery of the heat dissipation material so as to seal the heat dissipation material in a vacuum sealing cavity defined by the power semiconductor module, the radiator and the elastic sealing part and prevent the heat dissipation material from overflowing. The closed and vacuum structure of the invention can ensure that the heat dissipation material stably exists between the power device and the radiator and does not overflow, thereby ensuring that the external thermal resistance of the device is stable and reliable in the whole life cycle, and ensuring the service life and safety of the device.

The invention discloses a polyimide / polyacid-based composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method of the polyimide / polyacid-based composite photocatalyst comprises the following steps: (1) mixing and reacting an amine compound, a polyacid compound and a solvent to obtain a solid product; and (2) mixing the solid product with an anhydride compound, and carrying out thermal polymerization to obtain the polyimide / polyacid-based composite photocatalyst. The POM-pi interaction of polyimide and polyacid in the photocatalyst can improve the visible light absorption range and solubility of polyacid, improve the photon-generated carrier separation and transmission efficiency and recoverability of the photocatalyst, and in addition, the photocatalyst has the advantages of long service life, high stability and low cost. The method can play a continuous and efficient decomposition role in the field of hydrogen production by decomposing water.

The embodiment of the invention provides a preparation method of a high-entropy metal ceramic material and the high-entropy metal ceramic material, and relates to the technical field of ceramic, the method comprises the steps that CuzFeNiCryX high-entropy alloy powder is prepared, metal ceramic composite powder is prepared according to the CuzFeNiCryX high-entropy alloy powder and MC carbide, the metal ceramic composite powder is subjected to ball milling and mixing, and the high-entropy metal ceramic material is obtained. And the MC-CuzFeNiCryX metal ceramic powder with carbide particles distributed in a dispersed mode is obtained. And the MC-CuzFeNiCryX metal ceramic powder is prepared into a metal ceramic block body by adopting a powder thermal forming technology, so that the high-entropy metal ceramic material is obtained. The corrosion resistance of the high-entropy metal ceramic material is improved, the service life of a reactor is prolonged, and the stability of the reactor is improved.

The invention relates to a stress detection device and method for a rhodamine force-induced color-changing polymer material, belongs to the technical field of intelligent high polymer materials, and solves the problems of low test precision and incapability of repeated use in the prior art. The stress detection device for the rhodamine force-induced color-changing polymer material comprises a sample table, a clamp, the rhodamine force-induced color-changing polymer material, a camera device, a light source and a bracket. When the stress detection device is used for detecting the occlusal force of teeth, the occlusal force detection precision and portability in tooth oral treatment are effectively improved, and the real-time dynamic test of the occlusal force can be realized; the device assists in occlusal relationship evaluation, orthodontic treatment monitoring, restoration design, temporomandibular joint disease diagnosis, maxillofacial surgical operation evaluation and the like in oral clinical diagnosis and treatment.

The present invention belongs to the field of oral care materials, and specifically discloses a plant glycoside microcapsule and a preparation method and application thereof. The microcapsule is a core-shell structure, and the shell of the microcapsule is natural wax; the mass ratio of the core of the microcapsule to the shell of the microcapsule is 1: (0.3-0.7); the natural wax comprises a mixture of beeswax and carnauba wax in a mass ratio of 1: (0-0.2). The present invention uses natural wax as a coating material to encapsulate the plant glycoside extract to form a microcapsule, the microcapsule has a smooth surface, and the encapsulation is dense, which improves the stability of the glycoside substance, avoids the instability phenomenon such as oxidation and decomposition of its active ingredients, improves the stability of the plant glycoside extract in toothpaste, and makes the toothpaste containing the microcapsule have a longer storage stability.

The application discloses a kind of polylactic acid-based polyurethane and its preparation method and application, the polyurethane is with polyester polyol and L-lactide ring-opening polymerization to obtain diblock prepolymer, again with dicyclohexyl methane diisocyanate reaction and be prepared multi-block polyurethane;Wherein, the polyester polyol is PriplastTM 3238.The polyurethane body of the application has superior mechanical properties and excellent hydrophobic capacity, has excellent bonding performance after being used as adhesive and can be maintained bonding ability underwater.Solve the contradiction that existing polyurethane adhesive pollutes environment, the mechanical properties and adhesion of body cannot be taken into account, effectively prolong the service period of adhesive, make it show great application potential in many fields.

The invention provides a contact pressure type metal coating manufacturing device and application thereof. And the metal coating powder is sprayed on the surface of the coating matrix through the powder controller, and meanwhile, a roller is used for carrying out pressurization, ultrasonic vibration and continuous electric pulse treatment, so that the metal coating powder directly forms a metal coating on the surface of the coating matrix. In the forming process of the metal coating, the powder can be efficiently filled into pore positions through the pressure and ultrasonic vibration of the roller on the metal coating powder, formation of pores is reduced to a great extent, and therefore the coating can be formed on the surface of a coating base body in a highly-densified mode. The phenomena that in a traditional metal coating manufacturing technology, the bottom of a coating is exposed, the surface of the coating is cracked, shrinkage cavities are caused by coating bridging, sagging is caused by metal coating melting, the binding force between the metal coating and a base body is not firm or a coating base body loses efficacy due to a coating preparation technology can be overcome, and therefore the durability of the coating is improved, and the method is suitable for industrial production.

The invention discloses a pouring method for high-aluminum nickel-based alloy castings, and relates to the field of casting technology. The technical scheme is as follows: comprising the following steps: shell baking, melting, refining and pouring; wherein, after the refining is completed, the temperature is reduced to the surface of the high-aluminum nickel-based alloy, and the film is solidified, and then the temperature is kept for 1 to 2 minutes, and then the temperature is raised to the pouring temperature, and the heating process is divided into two stages, the heating power of the first heating stage is 35 to 45 kW, the heating time is 12 to 15 seconds, and the heating power of the second heating stage is 20 to 25 kW, and the heating time is 40 to 80 seconds; the high-aluminum nickel-based alloy is K424 alloy. The invention controls the power and time of the power transmission in the pouring heating process without changing the overall scheme of the pouring process, thereby achieving the purpose of changing the mechanical properties of the casting, and improving the mechanical properties of the casting such as the elongation after fracture and the section shrinkage rate.

The invention discloses a copper alloy strip and a production process thereof. The production process comprises the following steps of S1, burdening, S2, raw material pretreatment, S3, powder mixing, S4, compression molding, S5, sintering, S6, hot rolling machining, S7, cold rolling machining and S8, annealing treatment. The invention further discloses the copper alloy strip prepared by the production process of the copper alloy strip. According to the copper alloy strip, the Zr-Ti alloy powder, the Y-Al compound and the modified graphite micro powder are added into the copper alloy, so that the mechanical property of a copper matrix can be effectively changed, structure grains are refined, and the mechanical properties such as the tensile strength, the hardness, the toughness and the wear rate of the copper alloy strip are further improved; in the preparation process of the Y-Al compound, stirring is carried out under the ultrasonic oscillation condition, the modification preparation effect of the Y-Al compound is further improved, and the tensile strength, hardness, toughness, wear rate and other mechanical properties of the copper alloy strip are further balanced.