10results about How to "Extend service time" patented technology

The invention relates to the technical field of concrete preparation, in particular to moisturizing anti-cracking high-ductility concrete and a preparation method thereof. The moisturizing anti-cracking high-ductility concrete is prepared from the following components: 350 to 450 parts of ordinary Portland cement, 200 to 300 parts of fly ash, 30 to 50 parts of silica fume, 250 to 350 parts of quartz sand, 0.5 to 1 part of a water reducing agent, 10 to 20 parts of an expanding agent, 0.1 to 0.3 part of a retarder, 0.5 to 1 part of a thixotropic lubricant, 0.2 to 0.7 part of a modified nano material, 0.7 to 3 parts of a modified composite curing agent, 5 to 10 parts of an anti-cracking agent, 5 to 12 parts of polymer fiber and 180 to 220 parts of water. The high-moisture-retention high-water-retention concrete has the characteristics of high moisture retention and high water retention, is beneficial to maintaining the internal humidity balance, reducing cracks generated by drying shrinkage, improving the durability of the concrete, and remarkably reducing the cracking risk of the concrete in the hardening process, so that the concrete structure is more complete, the safety of the structure is improved, and the service life of the structure is prolonged.

The invention discloses a wear online identification and compensation control system and method for a high-pressure distribution plunger and barrel assembly, and the system comprises a data collection module which is used for collecting working condition data and state data; a health state dynamic baseline model obtained through offline training is arranged in the data processing module, and the wear level of the plunger and barrel assembly is recognized by calculating the residual error between actual state data and health state data predicted by the model under the current working condition; and the compensation control module is used for generating a self-adaptive compensation control instruction according to the identified wear grade and the current working condition and sending the self-adaptive compensation control instruction to an execution mechanism. According to the method, the dynamic base line synchronous with the real-time working condition is constructed, early weak wear characteristics can be separated from strong working condition interference, the recognition sensitivity and accuracy are improved, the influence of wear on the system performance is actively counteracted through closed-loop adaptive compensation control, the service life of equipment is expected to be prolonged, and the system performance is improved. And technical support is provided for predictive wear monitoring management.

The invention belongs to the field of protective coatings, and particularly discloses a thermal barrier coating surface modification method which comprises the following steps: sequentially forming an alloy layer and an aluminum layer on the surface of a thermal barrier coating to obtain a thermal barrier coating containing a modified coating; the thermal barrier coating containing the modified coating is subjected to heat treatment; the alloy layer contains aluminum and rare earth elements. According to the surface modification method of the thermal barrier coating, rare earth elements are introduced into the alloy layer, so that the in-situ reaction activity of the alloy layer and the surface of the thermal barrier coating is improved, a large number of Al3Zr intermediates with fine and uniform crystal grains are generated in the alloy layer, the interface energy caused by the in-situ reaction is reduced, complete coating is formed on the surface of the thermal barrier coating, and the surface of the thermal barrier coating is improved. And the CMAS corrosion resistance of the coating is obviously improved. In addition, surface modification is simple and easy to operate, and the method is suitable for large-scale popularization and application.

The invention relates to a power distribution network parallel capacitor bank intelligent switching system for reactive compensation of a power distribution network. The system comprises capacitor banks which are respectively connected in parallel with a trunk feeder line and a branch feeder line in a power distribution network system and are used for reactive compensation, and the capacitor banks connected in parallel with the trunk feeder line and the capacitor banks connected in parallel with the branch feeder line are both provided with circuit breakers used for controlling respective switching. By arranging the capacitor bank for short-line reactive compensation, requirements of key users can be quickly compensated, the line loss is reduced, and the power supply quality and the power supply reliability of the key users are guaranteed. Through monitoring peak-valley power consumption behaviors of key users, the intelligent switching model is utilized to optimize power factors of all levels of the power distribution network, so that the power supply quality of all levels of users is correspondingly adaptively adjusted, and the power supply quality and the power supply reliability are improved.

A kind of small milliwatt level thermoelectric cell based on americium isotope heat source, including battery main body, cooling device and external measuring circuit;Battery main body includes battery heat source component, shell cover, shell body, shell cover is installed on shell body;Battery heat source component is located in shell body, and heat insulation layer is filled between battery heat source component and shell body;Upper end of battery heat source component is connected with upper fixed part, lower end is connected with lower fixed part by thermoelectric power piece, and the upper end of heat conduction column is connected with lower fixed part, and the lower end is fixed with the inside of shell body.Electricity battery heat source component includes americium heat source core block, inner package shell, outer package shell, americium heat source core block is located in inner package shell, inner package shell includes inner package shell end cover, inner package shell body, and spring is filled between inner package shell end cover lower end and americium heat source core block, and helium is filled in inner package shell;Inner package shell is placed in lead shielding layer, lead shielding layer is placed in outer package shell, and outer package shell includes outer package shell body and outer package shell end plug.

The present invention discloses a method for preparing a small-scale non-premixed low-heat dissipation combustion chamber high-entropy ceramic thermal barrier coating, which belongs to the technical field of coatings. The method for preparing a small-scale combustion chamber high-entropy thermal barrier coating comprises: S1, drying the raw materials; S2, ball milling, drying, and sieving the raw materials; S3, sintering the sieved powder, and ball milling, drying, and sieving after sintering; S4, spraying a bonding layer on the inner wall of the combustion chamber; S5, vacuum heat treatment of the combustion chamber sprayed with the bonding layer; S6, spraying a high-entropy ceramic layer on the bonding layer. The chemical formula of the high-entropy ceramic layer is La 2( Z r0.3 Hf 0.2 Ce 0.2 Sn 0.2 Ti 0.1 )2O7. The bonding layer is NiCo 23 Cr 17 Al 12 Y 0.5 The present invention adopts the above-mentioned preparation method of the small-scale non-premixed low heat dissipation combustion chamber high entropy ceramic thermal barrier coating. The high entropy ceramic layer has a higher thermal expansion coefficient and lower thermal conductivity, which is beneficial to alleviate the heat load on the channel combustion chamber, increase the combustion chamber gas boundary contact temperature, adjust the thermal flow field in the cylinder, promote the complete combustion of the fuel, and effectively slow down the flame quenching phenomenon.

The application relates to a communication chain-free motor control system based on physical layer self-adaption and reflection impedance mapping, which comprises a space magnetic flux self-adaption mechanism; a transmitting end coil of the space magnetic flux self-adaption mechanism is fixed on a primary side fixed base; a receiving end coil is arranged at one end of a secondary side sliding block, and the other end of the secondary side sliding block is connected with a secondary side mounting base through an SMA spiral driver and a balance spring respectively; the secondary side sliding block is slidingly mounted on a linear guide rail support and moves along the axial direction of the linear guide rail support; a metamaterial lens flat plate is coaxially arranged between the transmitting end coil and the receiving end coil; the transmitting end coil is connected with a primary side circuit for energy supply; and the receiving end coil is connected with a secondary side circuit for receiving wireless electric energy and driving a motor. The application cancels a secondary side communication module and a position sensor, converts complex algorithm optimization into self-regulation matching of a physical structure, and significantly improves the dynamic response speed, operation robustness and environmental tolerance of the system under severe working conditions such as strong radiation, deep water and high vacuum.

The invention relates to the field of high-temperature protective coatings, in particular to a metal slag corrosion resistant ceramic roller coating which comprises a matrix component and a suspension component in a weight ratio of (10-15): (4-6). Wherein the matrix component comprises the following components in parts by weight: 15-25 parts of zirconium oxide, 40-50 parts of calcined aluminum oxide, 1-5 parts of kaolin, 1-5 parts of silicon oxide, 5-15 parts of yttrium oxide and 5-15 parts of silicon carbide. Correspondingly, the invention further discloses a preparation method of the coating for the metal-erosion-resistant ceramic roller. By implementing the method, the corrosion of the metal slag to the ceramic roller can be effectively reduced, and the service life of the ceramic roller is prolonged.

The invention discloses a magnesium alloy intravascular stent material with a nano water repellent layer and a bioactive coating and a preparation method of the magnesium alloy intravascular stent material, and belongs to the field of surface treatment of intravascular stent materials. Hydrophobic molecules containing sulfydryl are introduced to the surface of a pretreated magnesium alloy intravascular stent material to construct a nano water-repellent middle layer, the problem that an existing magnesium alloy intravascular stent is high in degradation rate is mainly solved, the surface of the nano water-repellent layer is modified with a bioactive coating, and the biological performance of the magnesium alloy intravascular stent is further improved. The method is mild in reaction condition, low in cost and beneficial to post-treatment. The developed nano water-repellent middle layer has better hydrophobicity and can obviously delay penetration of water molecules in a physiological environment, so that the degradation rate of a magnesium alloy intravascular stent material is reduced, the in-vivo service time is prolonged, and the biocompatibility of the magnesium alloy intravascular stent is not reduced; the method is high in operability and remarkable in effect, and a new method is provided for surface modification of the magnesium alloy intravascular stent material.

The utility model belongs to the technical field of contact networks, and particularly relates to a hinge-type connected anti-skid fatigue-resistant positioning stand column which comprises an upper hoop, a lower hoop hinged to the upper hoop and a positioning column fixed to the lower hoop, the upper hoop comprises a first ring body, a first hinge portion and a first limiting portion, and the lower hoop comprises a second ring body, a second hinge portion and a second limiting portion. The lower hoop comprises a second ring body, second hinge parts and second limiting parts connected between every two adjacent second hinge parts, and each second limiting part is provided with a notch allowing the corresponding first limiting part to be embedded and limiting the rotation amplitude of the first limiting part; the stress state in the matching process of the positioning stand column and the positioning pipe is improved, the fatigue performance is improved, the service time of the positioning stand column and the positioning pipe is prolonged, the hinge type connecting structure enables the lower hoop to be thicker and more reliable, damage and breakage of the connecting portion caused by oblique shear stress are avoided, and an attaching contact plane is designed on the enclasping face of the lower hoop and the positioning pipe, so that the service life of the lower hoop is prolonged. The clamping force on the positioning pipe in the holding state is improved, the positioning pipe is prevented from sliding, and the overall reliability is improved.