73results about How to "Achieve substitution" patented technology

The invention discloses a bismuth ferrite-based leadless piezoelectric ceramic with high Curie temperature and a preparation method thereof. The general formula for the piezoelectric ceramic is (1-x-y)(BizM1-z)t(FeuM'1-u)O3-xBaTiO3-yBiMnO3, wherein, M is a trivalent metallic element with large ionic radius, M' is a trivalent metallic element with small ionic radius, and x, y, u, t and z represent mole content in a ceramic system and satisfy the following relations: 0<=x<=1.0, 0<=y<=0.1, 0<z<1, 0.85<t<1.2, 0<u<1 and x+y<1. The piezoelectric ceramic is prepared by a conventional ceramic preparation method through selection of proper technological parameters. The piezoelectric constant d33 of the ceramic can reach 140 pC/N, Curie temperature can reach 490 DEG C, and Kt is more than 0.50. The preparation method has the advantages of a simple and stable process, and obtained leadless piezoelectric ceramic has excellent performance and is suitable for being used under high temperature.

The invention discloses a low-density and low-shrinkage-rate silver metal texture polypropylene composite material and a preparation method thereof. The polypropylene composite material comprises high-crystallized polypropylene, high-melt-value polypropylene, low low-shrinkage-rate polypropylene, hollow glass beads, ultra-white and ultra-fine talcum powder, toughening fillers, metal pigments, nano-zinc sulfide, hyperbranched resin, antioxidants and scratch-resistant agents. In the injection molding process of the free-spraying polypropylene composite material, obvious welding marks on the surface of the material are omitted, the appearance of the material approaches to spraying effects, components can be directly used, later spraying treatment is omitted, cost is saved, the material is green and environmentally friendly, the density of the material is much lower than that of common modified polypropylene, lightweight requirements of clients are met, the shrinkage rate of the material is lower than 0.5, the material can directly replace ABS (acrylonitrile butadiene styrene) in the field such as household electric appliance shells, secondary mold opening is omitted, and cost is saved.

The invention provides a chaotic image encryption method based on bit replacement and dynamic DNA coding. The objective of the invention is to solve the problem that security of chaotic encryption is affected by degradation of chaotic dynamics characteristics of an image encryption method based on a chaotic system in the prior art. The chaotic image encryption method comprises steps of firstly using the Keccak algorithm to calculate a hash value of a DNA sequence; based on the hash value, generating an initial state value of the chaotic mapping; by use of a hyperchaotic Chen system, generating a chaotic mapping index to carry out pixel position overall scrambling on an image; combining the Butterfly network to carry out bit position scrambling on each pixel, thereby achieving position grade scrambling; carrying out dynamic DNA coding on the image and combining the given DNA sequence to carry out XOR operation, thereby achieving replacing of the pixels; and finally, through the ciphertext feedback, further enhancing the chaotic and diffusion features. According to the invention, the chaotic image encryption method has big key space and is highly sensitive to a key, and capable of effectively resisting attacking operation of statistical analysis and exhaustion analysis.

The invention relates to a potassium niobate natrium series leadless piezoelectric ceramics and the manufacturing method. It is expressed by the general equation: (1-u)[(1-n)(LitNa1-w-t1Kw-t2)(Nb1-g-fTagSbf)O3+nBiMeO3]+uM. The invention has stable manufacturing technology and has great usefulness.

Embodiments of the invention disclose a virtual storage method, virtual storage equipment and a virtual storage system for terminals. The method comprises the following steps: when a terminal is started and powered on and starts loading an external memory card, the terminal sends a virtual storage request signaling to a cloud storage server through a dedicated channel carried by a high-speed wireless network; the terminal receives authentication success information sent by the cloud storage server through the dedicated channel, and sends an authorization request to the cloud storage server through the dedicated channel according to the authentication success information; after receiving authorization information sent by the cloud storage server through the dedicated channel, the terminal carries out a virtual disk mapping operation on a storage space corresponding to the terminal in the cloud storage server to map the storage space into a local virtual disk of the terminal; and the terminal loads applications and data corresponding to the terminal from the storage space corresponding to the terminal in the cloud storage server according to the mapping relationship between the local virtual disk of the terminal and the storage space corresponding to the terminal in the cloud storage server.

The invention discloses a cigarette formulating maintenance behavior mining system based on association roles and a method thereof. The cigarette formulating maintenance behavior mining system comprises a database server and a data mining client, wherein, the data mining client comprises a visual displaying tool which is connected with a data displaying and processing module and a result displaying module; the data displaying and processing module is connected with a data connecting module which provides connection of data sources with different data type formats, a database generating a mining algorithm and also interfaces through which a data object performs accessing; the result displaying module is connected with a mining and processing module which is respectively connected with a pattern storage module, a pattern evaluating module and a data connecting module; the data connecting module is connected with the data resources in an authentication processing module and the database server, and simultaneously, the authentication processing module is connected with a permission database in the database server, and the authentication processing module verifies the user validity through a user name and a password.

The invention discloses a potassium-bismuth titanate-based solid solution lead-free piezoelectric ceramic and a manufacturing method thereof. The components are represented by the general formula of (1-n){(1-u)(Bi0.5K0.5)TiO3+u[(1-z)Bi(CxDy)O3+zBiEO3]}+nM. The ceramic components of the invention have a morphotropic phase boundary of the rhombic ferroelectric phase and the cubic ferroelectric phase, good piezoelectric performance and higher Curie temperature. The ceramic components have the characteristic of environmental protection, can realize the replacement of a part of the traditional lead-containing piezoelectric ceramics, and can be manufactured by using the manufacturing method of the traditional piezoelectric ceramic and the industrial materials, thereby having practical application.

The invention discloses an energy recycling system and method for a liquid hydrogen fuel cell car. The system comprises a superconducting coil, a superconducting switch, a full-bridge type direct current chopper, a superconducting current lead, a direct current link capacitor, a DC-AC bilateral transducer, a vehicle-mounted motor and a measurement and control system, wherein the superconducting coil is immersed in a liquid hydrogen container, the superconducting switch and the full-bridge type direct current chopper are installed in a low-temperature Duval, and the superconducting current lead, the direct current link capacitor, the DC-AC bilateral transducer, the vehicle-mounted motor and the measurement and control system are arranged in a low-temperature hydrogen pipeline. The superconducting current lead is used for connecting the superconducting coil, the superconducting switch and the full-bridge type direct current chopper. The low-temperature hydrogen pipeline is used for connecting a liquid hydrogen fuel cell, the liquid hydrogen container and the low-temperature Duval. Compared with the prior art, the energy recycling system has the advantages that the superconducting coil is cooled directly through vehicle-mounted liquid hydrogen, the superconducting current lead, the superconducting switch and the full-bridge type direct current chopper are cooled directly through the low-temperature hydrogen produced through gasification of the vehicle-mounted liquid hydrogen, a supermumetal energy storing device is actually used in the liquid hydrogen fuel cell car, the brake energy recycling and reutilizing ratio of the car is improved, and staring time and accelerating time of the car are shortened.

The invention discloses a method for synthesizing p type doped silicon carbide by microwave in situ reaction. The steps include: using a group IIIA elementary substance or a compound containing the group IIIA element as the dopant, taking artificial graphite powder, activated carbon, coke or carbon fiber as the carbon source, and employing silicon powder or mixed powder of silicon powder and silicon oxide powder as the silicon source, under a vacuum condition, performing heat preservation for a period of time in a microwave irradiated electromagnetic field so as to obtain the p type doped silicon carbide. The preparation process has no need for raw material pretreatment, a subsequent annealing process or other processes, also has no need for a catalyst, a template and a substrate, etc., and has the characteristics of rapidity, simplicity, high efficiency and good reproducibility. In addition, because of the fast heating speed, uniform heating, small thermal inertia, short production cycle and other advantages unique to microwave irradiation treatment technology itself, the preparation cost is further reduced.

The invention relates to a semi-organic insulating coating paint for non-oriented silicon steel. The semi-organic insulating coating paint comprises the following components in parts by weight: 100 parts of metal dihydric phosphate, 5-100 parts of water-soluble epoxy resin dispersoid, 0.25-100 parts of amine resin or melamine and dicyandiamide and 100-2000 parts of pure water. The semi-organic insulating coating paint does not contain chromium, can be used for preparing a non-oriented silicon steel surface coating with good corrosion resistance, adhesiveness and heat resistance and can meet the requirements to the insulating performance of the coating in the fields of generators, transformers, compressors and the like.

The invention discloses a DC resistance selection method and system for a complex power distribution network comprehensive optimization device. The DC resistance selection method comprises the following steps: 1) constructing positive-sequence, negative-sequence and zero-sequence three-sequence fundamental frequency equivalent circuits and equivalent circuits at a sampling frequency for the complex power distribution network comprehensive optimization device; 2) constructing positive-sequence, negative-sequence and zero-sequence three-sequence equivalent circuits at a fundamental frequency anda sampling frequency of a power distribution system at a fault point; 3) calculating to obtain a relationship between fault current and DC resistance; 4) determining a lower limit value of the DC resistance; 5) calculating to obtain a relationship between the current of the sampling frequency at the fault point and the DC resistance; 6) determining an upper limit value of the DC resistance; and 7) obtaining the DC resistance according to the lower limit value and the upper limit value as well as a relationship between the lower limit value and the upper limit value. The DC resistance selection method and system disclosed by the invention have the benefits that a selected DC resistance value can take into account effective arc suppression and accurate line selection of the power distribution system, effectively improve the control performance of the comprehensive optimization device and realize the substitution effect on an arc suppression coil.

The invention provides a preparation method of a porous ceramic particle. The preparation method comprises the following steps of adopting pulverized fuel ash, construction waste, mine mud, clay and feldspar as main raw materials, adopting pulverized coal and the like as foaming agents, pretreating, mixing, pelleting, drying, and firing to obtain the porous ceramic particle. The porous ceramic particle prepared through the invention has the characteristics of high strength, long service life, low density, good liquidity, high water absorption, good nutrient preserving capability, high water-retaining property, good air permeability, easiness in controlling particle size, high in reusability, excellent in anti-hardening performance and the like; without the need of other soil, a matrix canbe directly applied to plant cultivation, can be widely applied to greening an outer wall, a roof, a square, a park, a desert and the like, and can be further widely applied to a soil conditioner, a fertilizer efficiency conditioner, an anti-hardening agent and the like. The preparation method of the porous ceramic particle provided by the invention is simple in process, high in production efficiency, low in cost, and suitable for large-scale industrial production.

The invention discloses a sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and a preparation method thereof. The general formula of the material is (1-x)(Na0.5Bi0.5)TiO3-xSrTiO3-0.01KNbO3-ySm2O3-zY2O3, wherein x=0.45-0.60, y=0.01-0.02, and z=0.01-0.04. The preparation technique adopts a solid-phase process and comprises the following steps: respectively presintering and synthesizing (Na0.5Bi0.5)TiO3, SrTiO3 and KNbO3 powders, carrying out ball milling in an ethanol medium according to the stoichiometric proportion by using rare-earth Sm2O3 and Y2O3 as dopants to obtain a slurry, drying, grinding, carrying out extrusion forming, and sintering to obtain the ceramic. The ceramic material prepared by the method has favorable dispersivity when the dielectric peak is 20-50 DEG C, and the dispersion coefficient gamma is greater than 1.9. The ceramic material has favorable electrostrictive properties, and the maximum electrostriction value in a 40kv/cm electric field is 0.3%. The dielectric constant at room temperature under the condition of 1kHz is greater than 3500, and the dielectric loss is lower than 0.02. The material has the advantages of simple preparation technique and low price, is free of the harmful element Pb, satisfies the requirements for the environment-friendly material, and has favorable application prospects in the fields of ultrasonic transducers, micro shifters and the like.

The invention discloses a method for strengthening carbonation resistance of alkali-activated concrete, and belongs to a method for improving carbonation resistance of alkali-activated concrete. According to the method, when the alkali-activated concrete is prepared, 5% to 30% (a mass ratio of a binding material) of P.O42.5-level ordinary Portland cement is doped, a hydration reaction occurs on the cement, and a great deal of Ca(OH)2 is generated inside the alkali-activated concrete, so that the content of a carbonation resistance substance is promoted obviously, the carbonation resistance isimproved obviously, and the durability of the alkali-activated concrete is strengthened. Moreover, the promotion of carbonation resistance can prevent carbonization reaction-caused compressive strength sudden drop of the alkali-activated concrete, so as to guarantee that the alkali-activated concrete still has the advantage of high strength. Therefore, a Ca(OH)2 internal-generation method eliminates the influence that the carbonization resistance of the alkali-activated concrete is deficient, the application of the alkali-activated concrete in the engineering is realized, the alkali-activatedconcrete is used for replacing cement concrete, the problem of environmental pollution caused by bulk deposition of industrial solid wastes can be eliminated, excessive dependence on the Portland cement also can be relieved, excessive consumption for non-renewable resources is reduced, and the method is significant for our country which lacks energy sources and is relatively serious in environmental pollution.

The invention discloses a waterborne polyurethane acidic polymer indicator and a preparation method thereof. The preparation method comprises the following steps: reacting polypolyols and excessive isocyanate, reacting with an indicator Congo red (CAS: 573-58-0), accessing the indicator Congo red onto a polyurethane molecular chain, introducing hydrophilic groups through a chain extension reaction, and finally preparing the waterborne polyurethane acidic polymer indicator by virtue of emulsification and solvent removal methods. The prepared waterborne polyurethane acidic polymer indicator hasthe characteristics of being excellent in storage stability, green, environmentally friendly, antibacterial, capable of preventing from pollution of samples under test and the like, and has the advantages of being convenient to use, capable of being repeatedly used, wide in application field and the like.

The invention relates to a cross shaft type electric transmission track-laying vehicle differential traveling device driven by two motors and belongs to the technical field of engineering machinery. The device comprises a driving motor, a steering motor, a two-way clutch, a one-way clutch, a main transmission mechanism, a differential mechanism and two power coupling mechanisms. Bevel gears of themain transmission mechanism and the differential mechanism are all double-curved-surface bevel gears, driving bevel gears are identical in offset direction and concentric, the driving motor is connected with a main transmission shaft through the one-way clutch, and the steering motor is connected with the main transmission shaft and the driving bevel gear of the differential mechanism through thetwo-way clutch. The steering motor and the driving motor are controlled by the two-way clutch to drive a track-laying vehicle at the same time for linear traveling, pivot steering or steering traveling. Both the driving motor and the steering motor adopt frequency-variable control technology, so that turning radius and power distribution of the track-laying vehicle are controlled accurately. Thedevice is simple in structure, reasonable in arrangement, few in parts, stable in transmission, high in transmission efficiency and simple to control.

The invention provides a cooperative control device and system for distributed energy sources. The cooperative control device comprises a first monitoring module, a first assessing module, a second monitoring module, a second assessing module and an output control module, wherein the first monitoring module is used for monitoring an energy conversion control parameter of distributed energy conversion control equipment in real time; the first assessing module is used for assessing an energy supply state of the distributed energy conversion control equipment according to the energy conversion control parameter; the second monitoring module is used for monitoring an energy supply parameter and a demand parameter of a power grid; the second assessing module is used for assessing a supply and demand balance relationship between an energy demand of the power grid and energy supply capacity of the distributed energy conversion control equipment; the output control module is used for outputting corresponding control signals to the distributed energy conversion control equipment and the power grid respectively according to the energy supply state and the supply and demand balance relationship. By adopting the cooperative control device and system, substitution and conversion among a plurality of energy sources can be realized, comprehensive utilization advantages of the energy sources are brought into play, the supply and consumption of the distributed energy sources are optimized integrally, and a low-carbon, energy-saving and environment-friendly energy source optimizing system framework is realized.

The invention discloses a motorcycle aluminum alloy surface passivating solution which comprises the following components: 21-23g / L of chromium sulfate, 4-6g / L of zirconium nitrate, 2-4g / L of titanium dioxide, 35-45ml / L of 70% sulfuric acid, 5-7g / L of nickel sulfate, 3-5g / L of ammonium sulfate, 0.5-1.5g / L of cerium chloride, 0.3-0.5g / L of lanthanum nitrate, 8-10g / L of water-soluble acrylic resin, 2-4 g / L of trisodium citrate and the balance of deionized water.

The invention provides a Huttinger power control system, which comprises a Robicon power control device, an interface control box and a Huttinger power supply. The Robicon power control device is electrically connected with the interface control box; the interface control box is electrically connected with the Huttinger power supply; a current/voltage analog quantity transition module, a relay module and a terminal block are arranged in the interface control box; the power supply transition control system changes a transition parameter of the current/voltage analog quantity transition module, the quantity of the current/voltage analog quantity transition module and the quantity of the relay module to convert different power control signals. Through adoption of the Huttinger power control system, the Robicon power supply is replaced; after isolating signals, a control signal is stable and an abnormal fault is reduced; the investment cost is reduced; the Robicon power supply can be replaced normally; the problems of aging Robicon power supply circuits and frequent faults are solved; faults time of the power supply is reduced; and normal production is guaranteed.

The invention belongs to the field of biomedical instruments, and particularly relates to a full-slice digital imaging self-adaptive automatic focusing method based on transfer learning. The transferlearning method based on a neural network mainly comprises an automatic focusing network, wherein the designed automatic focusing network can calculate the focusing distance according to the out-of-focus image; gradually adding the data under the new data set in an iterative mode to carry out transfer learning training; by adopting a transfer learning training mode, the automatic focusing networkcan have generalization and adaptivity capable of meeting requirements, data acquisition of different biological cell samples can be realized, and software virtualization is carried out on traditionalfull-slice digital pathological imaging hardware.