33results about How to "Low technical difficulty" patented technology

The invention discloses a flame surface/progress variable model-based supersonic turbulent combustion flow calculation method, and belongs to the field of computational fluid dynamics (CFD). The method comprises the steps of establishing a flame surface database; performing RANS solving by using the flame surface database; and building a compressible scale model of a progress variable source item. In view of a flame surface/progress variable turbulent combustion model with self-ignition and flameout phenomena, a novel compressible scale model with a definite physical meaning is built for the progress variable source item, so that a corrected flame surface/progress variable model can accurately describe self-ignition and flameout processes; and the high Mach number effect of flow is effectively considered, so that the simulation precision of supersonic turbulent combustion flow is greatly improved. The technology is low in realization difficulty, can be used as compressible correction, and only needs to be added as a sub-program; and an original program is slightly modified during CFD program coupling calculation.

A rectifier transformer with self-couple compensation and shielding harmonic is disclosed. The self-couple tap is led out from the secondary winding in the supply transformer, this tap divides the secondary winding into two stages: the analogous auto-transformer common winding and series winding. Both of them are coupled closely, the secondary windings of the two stages and primary winding are arranged with one center on the iron core cylinder, specially the common winding is arranged between the primary winding and series winding, its equivalence impedance value is zero. The both ends of common winding connect to the bypass of external filter capacitor inductance. The invention can take reactive compensation for inductive current at user's power frequency. Utilize the Ampere-turn balancing action of two windings divided by tap at relevant harmonic frequency to neutralize the harmonic current, thereby leads the harmonic current to return to load nearby through series winding and prevents the harmonic current from crossing the air gap into primary power network. It also prevents the harmonic magnetic flux from damaging to the transformer.

The invention discloses a compressible wall function calculation method considering a boundary layer combustion heat release effect, and belongs to the field of computational fluid mechanics. A velocity wall law and a temperature wall law under a combustion chemical reaction condition are proposed through theoretical derivation; based on this, a unified wall function calculation method capable of being compatible with compressible turbulent boundary layers with/without a chemical reaction simultaneously is established; and a detailed process coupled with a CFD program for solving is designed. The calculation method is low in technical realization difficulty and is suitable for the condition with or without the boundary layer combustion heat release effect. The numerical simulation efficiency of frictional resistance/heat flow of a flow passage in a scramjet engine can be greatly improved, so that the calculation cycle is greatly shortened.

The invention relates to a plate-fin type heat exchanger with fluid being flowing back and forth in a channel. Cold channels and hot channels inside the plate-fin type heat exchanger are arranged in a layered and crossed manner and are separated by channel clapboards, and heat transfer fins are arranged in the channels; one or more horizontal adjusting battens which are horizontally arranged are arranged in each channel of the heat exchanger to separate the channel into a plurality of horizontal flow passes in the height direction; the horizontal flow passes are connected in series end to end by vertical flow passes in each channel; fluid participating in heat exchanger flows through each horizontal flow pass and each vertical flow pass in sequence to form repeated back-and-forth flow in each channel; through setting the widths of each horizontal flow pass and each vertical flow pass in each channel, the plate-fin type heat exchanger is easy to enable the fluid in each channel to keep in a reasonable range; and even if the fluid is subjected to phase change in the heat exchanger to cause that the volume and the flow rate of an inlet are very remarkably different from those of an outlet, and the reasonable flow rate distribution can be achieved by using the plate-fin type heat exchanger. The plate-fin type heat exchanger has the advantages of easily realizing flow rate regulation and distribution of the fluid, improving the efficiency of the heat changer, saving the occupied space and remarkably lowering the manufacturing cost.

The invention relates to an extreme ultraviolet-ray space remote communication system. The extreme ultraviolet-ray space remote communication system comprises an extreme ultraviolet pulse generation modulator, an extreme ultraviolet collimator, an extreme ultraviolet focuser and an extreme ultraviolet detection demodulator; the extreme ultraviolet pulse generation modulator is arranged on the focal point of the extreme collimator and used for modulating a to-be-transmitted digital signal, and the signal is output in an extreme pulse signal form; the modulated extreme pulse signal is transmitted in an orientation manner after being collimated by the extreme ultraviolet collimator; the extreme ultraviolet focuser is used for receiving the extreme ultraviolet pulse signal and focusing the extreme ultraviolet pulse signal, and the extreme ultraviolet detection demodulator which is arranged on the focal point of the extreme ultraviolet focuser is used for demodulating the extreme ultraviolet pulse signal to obtain the to-be-transmitted digital signal.

The present disclosure relates to an eyedrop applicable to limbal stem cell deficiency and a preparation method, wherein each liter of the eyedrop includes the following components: 1 to 40 mg of human adipose-derived stem cell exosomes, excipients: 0.5 to 2 g of sodium hyaluronate, 0.5 to 3 g of vitamin B6 and 0.05 to 0.3 g of benzalkonium chloride, and the balance of medical normal saline, a pH of the eyedrop is 6.5 to 7.5; and the eyedrop of the present disclosure is effective in treating limbal stem cell deficiency.

The invention aims to provide a method and equipment for determining an evaluation score of an audio and video call. The method comprises the following steps: acquiring numerical information corresponding to one or more predetermined call parameter types of a first user in a target audio and video call; for each predetermined call parameter type, according to an interval distribution model corresponding to the predetermined call parameter type, determining a distribution interval corresponding to the numerical information corresponding to the predetermined call parameter type in the interval distribution model, determining the score information corresponding to the distribution interval as the score information corresponding to the predetermined call parameter type in the target audio and video call; and determining evaluation score information of the first user in the target audio and video call according to the score information corresponding to each predetermined call parameter type in the target audio and video call. Hardware investment and manpower investment required by the method are extremely low, the technical implementation difficulty is low, and the method has high operability in industrial practice.

The invention discloses a synonym mining method and device, a storage medium and computer equipment, and relates to the field of big data analysis. The method comprises the steps of obtaining a targetstatement, searching the target statement for through a full-text search engine, obtaining a first similar statement of the target statement, and the target statement and the first similar statementcomprise at least one same word; creating a similar sentence pair according to the target sentence and the first similar sentence; performing similarity scoring on the similar sentence pairs, obtaining synonym sentence pairs according to the similarity scores, and performing word alignment extraction on the synonym sentence pairs to obtain synonym pairs; and inputting the synonym pairs and the target statement into the full-text search engine for iterative search and iterative extraction to obtain a plurality of synonym sentence pairs and a plurality of synonym pairs. According to the method,the mining quantity and mining quality of synonyms and synonym sentences can be remarkably improved, and the synonym mining limitation and technical implementation difficulty are reduced.

The invention relates to a universal-type centralized management platform with high fault tolerance, and the management platform comprises centralized control platform hardware equipment and a built-in centralized control platform operating system. The management platform is characterized in that the centralized control platform operating system is provided with virtual software; the virtual software is used for virtual configuration of a plurality of virtual machines, and each virtual machine is provided with a virtual machine operating system to form a multi-virtual-machine structure; each virtual machine is corresponding to one type of PLC SCADA software, and a PLC SCADA project is imported through the PLC SCADA software, thereby forming independent virtual machine management structures; each virtual machine management structure is nested in the centralized control platform operating system, and independently exists and works in the centralized control platform hardware equipment and the built-in centralized control platform operating system; each virtual machine management structure is compatible with various types of advanced operating systems, thereby forming the universal-type centralized management platform with high fault tolerance. The platform is simple in structure, is convenient to set, use and maintain, and is low in cost.

The invention discloses millimeter wave cell radiation experimental apparatus assembled with a planar choke ring. The millimeter wave cell radiation experimental apparatus comprises a radiator, a plane bracket and a cell sample; the radiator consists of a solid-state source and an aperture antenna and is located below the plane bracket; the cell sample is placed on the plane bracket and is coaxially arranged with the radiator in the vertical direction; the millimeter wave cell radiation experimental apparatus further comprises the planar choke ring, a lifting sliding saddle, a high-precision three-dimensional sliding table and an industrial microscope; the planar choke ring is fixed to the lower surface of the plane bracket and is located between the radiator and the cell sample; the plane bracket is installed on the lifting saddle; the high-precision three-dimensional sliding table bears the radiator; the industrial microscope is arranged on the uppermost portion of the apparatus; the planar choke ring includes two layers of metal plates; and an upper elliptical hole and a lower elliptical hole are formed in the center of the upper metal plate and the center of the lower metal plate respectively to form a stepped structure. The planar choke ring of the millimeter wave cell radiation experimental apparatus can effectively reduce radiation nonuniformity of a cell experiment and improve radiation efficiency, and has good adaptability to mechanical manufacturing tolerance, installation deviation, frequency drift and electromagnetic parameters of the cell sample.