137results about How to "Substitutable" patented technology

The invention discloses a modular full direct current photovoltaic system and a control method thereof. The system comprises n DC (direct current)-DC converter modules and an MMC (Multi Media Card) centralized inverter, and every DC-DC converter module is connected with an independent control loop and a maximum power tracking control function so as to ensure that a photovoltaic battery pack connected with every DC-DC converter works on the highest point of the output power. According to the modular full direct current photovoltaic system and a control method thereof, a direct current bus is formed by connecting the output ends of a plurality of DC-DC converter modules in series, and the high-power grid-connected power generation function is achieved through the centralized MMC inverter. The direct current bus can effectively reduce the operating loss of the entire system and structurally improve the operating efficiency of the system.

The invention discloses a pedal durability tester and belongs to the field of vehicle accessories. The pedal durability tester comprises a biaxial double-action type cylinder, two pedals, a rod end joint bearing, a pedal support, an experimental tool and a pneumatic system; two panels are fixed on the experimental tool via the pedal support; the biaxial double-action type cylinder is fixed on the experimental tool; two rod ends of the biaxial double-action type cylinder are connected with the rod end joint bearing; and the pneumatic system is connected to the tester via the biaxial double-action type cylinder. The pedal durability tester has the beneficial effects of capability of carrying out the durability test of the two pedals, convenience for maintenance and change and easiness for the acquisition of a gas source and low manufacturing and maintaining costs; and the reciprocating movement velocity of the cylinder can be continuously adjusted from a low speed to a high speed by adjusting the air inflow of the cylinder so as to meet the requirements on the test speed of the pedal under different conditions.

The invention discloses a master batch capable of fully and biologically degrading a plastic film and a preparation method thereof, and belongs to the field of high molecular films. The formula of the master batch comprises the following materials in parts by weight: 100 parts of starch, 2-9 parts of coupling agent, 8-18 parts of dispersing agent, 8-25 parts of polycyclolactone, 1-50 parts of polylactic acid, 8-15 parts of poly (hydroxybutyrate-hydroxyvalerate) (PHBV), 10-25 parts of plasticizer, 0.15-1.0 part of anti-tackiness agent, 0.15-1.2 parts of pro-oxidant and 1-15 parts of chemical precipitation promoter. The preparation method of the master batch comprises the three steps of: thinning the starch; mixing; and forming. The product provided by the invention has the advantages of high starch content, being a fast-growing and renewable resource, rich resource, low unit cost, high substitutability, obvious economic benefit and ecological benefit and capabilities of reducing the content of polycyclolactone, increasing polylactic acid and poly (hydroxybutyrate-hydroxyvalerate) (PHBV), improving product performance and meanwhile reducing cost.

The invention provides an electrified railway through-type traction power supply system, and belongs to the technical field of railway traction power supply systems. The traction power supply system is characterized in that the output end of a connection transformer CT is connected with an alternating current side of a three-phase MMC rectifier through a filter inductance Ls, and a direct currentside DC is connected with a direct current bus; the input end of a single-phase MMC inverter is connected with the direct current bus, the output side is connected with a single-phase step-down transformer SDT primary winding, and single-phase alternating current, with output voltage of 27.5 kV, of the secondary side of the single-phase step-down transformer is connected into a railway traction network to supply power to trains. The alternating current side of a AC-DC transformer of wind power generation WP is connected with the output of a fan, the direct current output side is connected thedirect current bus, one side of a DC-DC converter of photovoltaic power generation PV is connected with the output of a photovoltaic panel, the other side of the DC-DC converter of the photovoltaic power generation PV is connected with the direct current bus; and one side of a DC-DC converter of an energy storage system NS is connected with a hybrid energy storage system formed by a storage battery and a super capacitor, and the other side of the DC-DC converter of the energy storage system NS is connected with the direct current bus.

The invention discloses a spinning method of a variable diameter pipe dieless floating rolling ball and a fixture. In the invention, the designed special fixture is used to carry out multi-pass spinning on pipe blank in a segmented way, the method comprises the following concrete processes of determining the outer diameter of each diameter shrinkage section through spinning in trial, spinning each diameter shrinkage section in a segmented way, reasonably controlling the rotary pressing quantity of each spinning process, and finally obtaining a finished pipe fitting. The invention is used for spinning and forming an austenitic stainless steel pipe and has the advantages of the strong substitutability and high working efficiency and is simple and convenient to operated. Because of weak strength, the austenitic stainless steel pipe has the elongation above 40 percent, has good plasticity to be beneficial to shrinking the diameter and has good effect by applying a rolling ball to carry out spinning. The fixture can efficiently control the diameter of the diameter shrinkage of a thin-wall pipe, thereby solving the technical problem of local diameter shrinkage of a variable diameter pipe; and the fixture has simple principle, reasonably utilizes the functions of an ordinary lathe and has the advantages of easy processing and low manufacture cost.

The invention discloses a high-voltage electrostatic mist spray preparation method for nanometer-leveled cellulose materials, and belongs to the preparation field of organic function nanometer materials. Solve cellulose materials into a cellulose solvent as mass component shares before mixing at the speed of 500 to 2000 rpm; the solving temperature is 80 to 100 celsius degrees, and both the maxing and solving should be done with protection of nitrogen, so as to gain slurry with nanometer-leveled cellulose; add the prepared cellulose slurry into a propulsion pump, and place a receiving board at a distance of 10 to 20cm away from the propulsion pump; put the receiving board into a coagulating bath, and spray the cellulose slurry onto the receiving board with a 15 to 20kV high-voltage electrostatic method, so as to collect nanometer-leveled cellulose materials from the slurry before solvent collection is done. The overall preparation method has advantages of being simple and convenient, high opera operability, belonging to a physical process and having no pollution to environments.

The invention relates to the technical field of bio-imaging, in particular to preparation and application of a same-energy rare earth luminescent probe based on change of luminescence lifetime. The rare earth luminescence lifetime probe comprises a luminescent donor Ln, an energy acceptor Qe and a linking material Link, the general structural formula is Ln-Link-Qe, and the luminescent donor is composed of rare earth nanoparticles, wherein energy absorption and fluorescence emission occur at the same electronic state energy level; the energy acceptor is matched with the luminescence wave band of the rare earth nanoparticles, and the energy transfer process occurs, so that the fluorescence lifetime is changed; and combination of the luminescent donor and the energy acceptor is performed through the linking material in an electrostatic adsorption, covalent coupling or twining mode, so that energy transfer is promoted. The luminescence process of the rare earth luminescent donor of the probe conforms to the first-order reaction kinetics, and the number of the energy acceptor of the probe relative to the luminescent donor is linear to the fluorescence lifetime of the rare earth material, so that the lifetime signal is utilized, and target detection in a complex environment is achieved; and great application prospects in the field of biological detection is achieved.

The invention discloses a mixed light combining-wavelength dividing demultiplexer based on array waveguide grating. The mixed light combining-wavelength dividing demultiplexer comprises a substrate and a wrapping layer and a wave guide layer arranged on the substrate sequentially from bottom to top, wherein the wave guide layer is a graph layer, where input waveguide, an input free transmission area, array waveguide, an output free transmission area and an output waveguide array are etched rightward with same thickness along a horizontal plane. The mixed light combining-wavelength dividing demultiplexer integrates wavelength dividing and light combining functions. During downlink communication, the mixed light combining-wavelength dividing demultiplexer can realize wavelength dividing de-multiplexing function, and during uplink communication, the mixed light combining-wavelength dividing demultiplexer can realize light combining function. The construction cost of a passive optical network (PON) can be lowered at certain level.

The invention discloses a horizontal-array high-power semiconductor laser capable of replacing a chip, which comprises a refrigerator. A liquid passage is arranged in the refrigerator; the upper end face of the refrigerator is a horizontal mounting surface; a plurality of laser chip mounting components, which are parallel to and independent from one another, are arranged on the horizontal mounting surface; each laser chip mounting component consists of the chip, and a lower insulating strip, a positive heat sink, an upper insulating strip, a chip cathode connection piece and an electrode connection piece which are sequentially laminated and fixed from bottom to top; the anode surfaces of the chips are connected with the positive heat sinks, while cathode surfaces are connected with the electrode connection pieces; and fixed plates are arranged at the upper ends of the plurality of laser chip mounting components. In the horizontal-array high-power semiconductor laser capable of replacing the chip, the plurality of independent laser chips (bars) are taken as cores and are arranged into a laser chip mounting component array in a horizontal direction, and the plurality of laser chip mounting components share the refrigerator, so thermal resistance can be reduced, radiation capacity can be improved, the optical output power of the laser is improved, and the quality of laser beams can be greatly improved under the condition of adding an alignment system.

The invention discloses a bio-based methanol gasoline composite auxiliary and a bio-based high-proportion methanol gasoline. The bio-based methanol gasoline composite auxiliary disclosed by the invention comprises the following eight additives with different effects and functions: 25-35% of a solubilizing cold starting agent, 12-20% of an anti-explosion gas resistance-reducing agent, 3-5% of an emulsifying and water-melting agent, 2-3% of an anti-corrosion inhibitor, 4-6% of an anti-swelling and degumming agent, 5-6% of a detergent dispersant, 16-25% of an oil product stabilizer and 10-20% of a power reinforcer, so that the respective advantages of all the functional additives are fully realized and the deficiencies in the functions are further overcome. The invention also relates to the bio-based high-proportion methanol gasoline which comprises 85-95% of bio-methanol or anhydrous industrial methanol, 4.2-14.5% of bio-based methanol gasoline component oil and 0.5-0.8% of the bio-based methanol gasoline composite auxiliary. The bio-based high-proportion methanol gasoline disclosed by the invention solves 24 technical difficult problems in eight major types in using process of methanol gasoline and improves the various performances of the high-proportion methanol gasoline.

The invention discloses an aerogenic composition of a pretensioner of an automobile safety belt, which is prepared from flammable agent, mixed oxidants and adhesive, wherein the mass percent of the flammable agent, the mixed oxidants and the adhesive are respectively 40-85%, 10-55% and 2-10%. A preparation method of the aerogenic composition comprises the following steps of: kneading and mixing, extrusion moulding or squeezing, and cutting; then drying for 4h-12h under the condition that the room temperature is 60 DEG C; and then after drying for at least 6h under the temperature of 102-120 DEG C, carrying out screening treatment, obtaining medicine granula with the given size, and thermal packing by using a plastic bag. The aerogenic composition has good heat-resistant quality, good compatibility, wide sources and cost-effective raw materials, particularly has good thermal stability, and can replace nitrocellulose.

The invention discloses a car door lock coupler device. By arranging a rocker, the car door lock coupler device utilizes the interaction between a driving belt of a door machine motor and a rocker restoring spring to control the swing of the rocker and then controls the opening and closing of a car door in combination with the action of a left door ball and a right door ball at the landing door side. The invention integrates a car door lock function into car door couplers, a shaft ramp does not need to be arranged at each storey, installation accuracy is not required as well, and installation and debugging man-hours are reduced. The car door lock coupler device is an invented device which is convenient to mount and use and can bring high economic benefit, and the car door lock coupler device is not affected by the opening width and the opening height, is highly universal and has a wide application range.

The invention provides a low-temperature leakage detecting liquid used for air tightness detection of a liquid propellant storage and transportation device. The raw constituents of the low-temperature leakage detection liquid are water, a low-temperature solvent, a surfactant, SDS (Sodium Dodecyl Sulfate) and disodium hydrogen phosphate; the raw constituents are mixed uniformly according to a proportion to form the low-temperature leakage detecting liquid. The low-temperature solvent is ethanol or ethylene glycol; the surfactant is any one of octyl alkylphenol polyoxyethylene ether, nonyl phenol polyethenoxy ether and phenethyl phenol polyoxyethylene ether; the SDS serves as an additive agent for improving stability of bubbles, and the disodium hydrogen phosphate serves as a corrosion inhibitor. The low-temperature leakage detecting liquid can be used for air tightness detection of the liquid propellant storage and transportation device in an environment at 0 to -50 DEG C, is strong in bubbling capability, good in air bubble stability and strong in anti-freezing capability, can efficiently solve the problem that a common leakage detecting liquid when being used in a low-temperature environment is frozen, and improves leakage detection reliability and operation safety of the liquid propellant.

The invention discloses flame-retardant furan epoxy resin and a preparation method thereof, and belongs to the technical field of polymer compounds. The flame-retardant furan epoxy resin is prepared from furan epoxy resin monomers which are prepared through derivation of hydroxymethylfurfural. The preparation method comprises the specific steps: performing melting and uniform mixing on the furan epoxy resin monomers of different structures and curing agents of different types, and then performing injection molding, heating and solidification so as to obtain the flame-retardant furan epoxy resin with superior performance. A bulk solidification method is adopted directly, the operation flow is simple, the curing time is short, and the obtained bio-based epoxy resin polymer material has excellent performance.

The invention relates to an injection nozzle for sprinkling irrigation and fertilization of a circular sprinkling irrigation machine, which is characterized by comprising a strip-shaped nozzle body; a contraction type flow passage which is gradually narrowed down is formed inside the nozzle body; one wider end of the flow passage of the nozzle body is connected with a nozzle cap, the other end of the nozzle body is inserted into a water inlet pipe of the circular sprinkling irrigation machine, and a nozzle head is integrally arranged at the end part of the nozzle body; a nozzle flow passage communicated with the contraction type flow passage is formed inside the nozzle head, and the other end of the nozzle head is connected with a blockage; a blocking plug and a spring are arranged in the nozzle head flow passage; a plurality of nozzle outlets are formed in the circumferential direction of the nozzle head; one end of the nozzle cap is connected with the nozzle body, and an exhaust device is arranged at the other end of the nozzle cap; and an inside flow passage is formed in the nozzle cap and is communicated with the contraction type flow passage in the nozzle body, a fertilizer inlet pipeline is vertically arranged on the outer wall of the nozzle cap, one end of the fertilizer inlet pipeline is communicated with the inside flow passage of the nozzle cap, and the other end of the fertilizer inlet pipeline is connected with a water outlet pipeline of a fertilizer liquid pressing device. The injection nozzle has good mechanical performance and hydraulic performance, has the function of preventing the backflow of water and is suitable for the sprinkling irrigation and the fertilization of the circular sprinkling irrigation machine.

The invention relates to the resistance furnace temperature control method technology field and particularly relates to an automatic resistance furnace temperature control method based on a queue model. The method comprises steps that (1), even group division is carried out, all heaters in a single resistance furnace are evenly divided into N groups according to heating power, any group of heaters is connected with a power source through a switch device, and all switch devices are controlled by a controller to realize on and off; (2), the setting temperature inputted from the controller is defined to be Tset, and the actually-measured temperature acquired at the controller is defined to be Tact; (3), the group quantity of heaters needing being switched on or switched off is calculated, when the Tact is smaller than the Tset, the group quantity of heaters needing being switched on is defined to be B, when the Tact is greater than the Tset, the group quantity of heaters needing being switched off is defined to be E; and (4), the heaters are switched on or switched off. Through the method, the temperature of the resistance furnace can be more excellently controlled.

To realize stable supply and measurement of micro flow, the invention provides a micro flow supply measuring device. The device comprises a constant pressure unit, a supply unit and a measuring unit;the constant pressure unit comprises an automatic pressure regulating device and a constant pressure balancing container; the inlet of the constant pressure balance container is connected with an airsource through the automatic pressure regulating device, and the outlet of the constant pressure balance container is connected with the supply unit; the supply unit comprises a propellant supply container, an electronic scale, a first vibration damping assembly and a supply pipeline, wherein the inlet of the propellant supply container is connected with the outlet of the constant pressure balancecontainer, and the outlet of the propellant supply container is connected with the measuring unit through the supply pipeline; the electronic scale is arranged below the propellant supply container,and the first vibration damping assembly is arranged below the electronic scale; the measuring unit comprises a first capillary tube, a mass flow meter, a second capillary tube and a measuring pipeline, the first capillary tube, the mass flow meter, the second capillary tube and the measuring pipeline are connected in sequence, and a second filter, a second pneumatic control valve and a pneumaticdischarge valve are arranged on the measuring pipeline; and the inlet of the first capillary tube is connected to the supply pipeline.

A special-shaped inner tube all-glass vacuum solar-energy collecting tube is characterized in that: the wall of inner tube (2) is a polyhedral cylinder axially extending along the inner tube (2); the inner and outer faces of the wall of inner tube (2) are relative to the cylinder; the radial section of inner tube (2) is relative to the polyhedral cylinder of the wall of inner tube (2); the face of polyhedral cylinder is plane, or the convex arc or the concave arc. The invention has the advantages in the replace function on the general full-glass vacuum solar-energy collecting tube, to improve the inner and outer faces of inner tube (2), to improve heat adsorption, reduce the water volume of inner tube, improve the heat efficiency and improve the strength, while it can resist the inner water pressure, the axial bend and the explosion. The invention has simple production and low cost.