137results about How to "Reduce the difficulty of research and development" patented technology

The invention discloses Beidou-communication-system-based Beidou broadcast short message receiving equipment and a Beidou-communication-system-based Beidou broadcast short message receiving method. The Beidou broadcast short message receiving equipment comprises a receiving device, a storage device, a Beidou communication processing device and a control device, wherein the receiving device is used for receiving a short message broadcast and received from a Beidou communication satellite; the storage device is used for storing an identification number of an information broadcast lead aircraft to determine the lead aircraft to which the broadcast short message receiving equipment belongs; the Beidou communication processing device is used for processing the received short message when the control device confirms that the short message received by the receiving device belongs to the short message receiving equipment; and the control device is used for controlling identification over an identifier of the received short message and the identification number in the storage device, and controlling the Beidou communication processing device to process the received short message. By the Beidou broadcast short message receiving equipment and the Beidou broadcast short message receiving method, the product research and development difficulties and cost of the Beidou broadcast short message receiving equipment are greatly reduced relative to Beidou universal subscriber machine, and simultaneously, the number of the Beidou broadcast short message receiving devices may not be limited.

The invention discloses an integrated governance device for electric energy quality. The integrated governance device comprises a static var generator and a static var compensator; the static var compensator comprises a fixed compensator and a thyristor control electric reactor; the static var generator, the fixed compensator and the thyristor control electric reactor are connected on a power grid between an electric network source and a load in parallel; each static var generator comprises one or more than two H-bridge units connected in series; direct current support capacitors are connected to two ends of the H-bridge units in parallel; each fixed compensator comprises a capacitor and an electric reactor which are connected in series; each phase of thyristor control electric reactor comprises a phase-control reactor and a controllable valve body composed of one or more than two reverse parallel thyristors connected in series, and the controllable valve body is connected with the phase-control reactor in series. The device not only can compensate as to idle work, but also can achieve the compensation of a harmonic wave and a negative sequence. Meanwhile, the idle work and harmonic wave are continuously and adjustably compensated at the high-voltage side, and no transformer is led, so that the compensation speed is fast.

The invention discloses a frequency stability measurement method and system based on high-precision phase-frequency analysis. The measurement method adopts an all-digital implementation scheme, uses amulti-channel high-speed ADC to directly perform sampling and digitization processing on analog frequency signals of a frequency source to be measured and a reference signal source, and then uses thedigital quadrature down-conversion technology to achieve dual-mixing measurement, and then obtains high-precision frequency difference measurement sequences through high-precision phase-frequency analysis, phase difference calculation and frequency difference calculation, and calculates the overlapping Alan variance to achieve frequency stability measurement of the frequency source to be measured. The measurement method avoids the disadvantages of difficult design and long development period of analog and semi-digital implementation schemes; the high-precision phase-frequency analysis algorithm lowers the demand for the quantify resolution of the measurement system ADC device compared with the current digital phase detector measurement method; and the hardware cost is reduced, and the ability to use higher rate ADC devices to increase the system's measurable frequency range is provided.

The invention relates to an automatic bank account arrival record processing method and system, equipment and a storage medium, belongs to the technical field of process automation, and automaticallyrealizes account arrival record claiming, sorting and entering operation. The method specifically comprises the steps that RPA robot login information is configured; an automatic processing script andan execution process of the RPA robot are configured; the RPA robot automatically logs in the online banking system, claims and stores collection record information from transaction flow or receipt data of the online banking system according to the configured automatic claim script and execution flow; the RPA robot automatically logs in the financial system, imports the collection record information into the financial system, sorts and inputs the collection record information according to a configured automatic sorting and account entry script and an execution process to generate a bank account arrival notice list, and automatically transmits and generates an accounting voucher. The operation of the method does not need manual intervention, the processing is accurate and error-free, the work processing efficiency and value are greatly improved, and the research and development difficulty and cost are low.

The invention provides a geostationary satellite imaging navigation and registered orbital motion compensation method. The method includes the following steps: a first step, writing an expression of adesired target point coordinate on an earth ellipsoid corresponding to a preset scanning mirror rotation angle according to a scanning reflective mechanical optical path model of a remote sensing instrument while a satellite is at a nominal fixed point; a second step, calculating a desired scanning mirror rotation angle while the satellite is at an orbital position after drifting and points to aground desired target point; and a third step, using the desired scanning mirror rotation angle to subtract the preset scanning mirror rotation angle to acquire an orbital motion compensation amount.The acquired image and an earth nominal grid image generated by the satellite at the nominal fixed point are consistent, errors are controlled in an indication range, and the research and developmentdifficulty of a system can be lowered, and the realizability of engineering can be improved.

The invention discloses an MEMS (Micro electro mechanical system) gravimeter, which comprises oscillator units, a displacement sensing structure, a displacement detection circuit, a cavity body and a horizontal adjusting base, wherein the oscillator units are arranged inside the cavity body; each oscillator unit comprises a negative-stiffness spring, a positive-stiffness spring, a detection mass and an outer frame; the detection mass is connected with the outer frame through the positive-stiffness spring and the negative-stiffness spring; the positive-stiffness spring and the negative-stiffness spring are symmetrically arranged about the detection mass; the outer frame is fixedly connected with the cavity body; the displacement sensing structure is arranged on the surface of the detection mass; the displacement detection circuit is used for detecting displacement signals of the displacement sensing structure; the oscillator unit realizes reduction of eigenfrequency through match between the positive-stiffness spring and the negative-stiffness spring; and through detecting the displacement of the detection mass, changes of a gravitational acceleration are further detected. The MEMS gravimeter has the advantages that the stability is high; the size is small; the weight is light; the production cost can be effectively reduced; and the research and development difficulty of a signal detection unit and a stable platform can be effectively reduced.

The invention discloses a logistics system and method, which relate to the field of express logistics. The logistics system includes a delivery terminal connected to a server, a client terminal, a transfer station, an express terminal, and an express cabinet terminal; The unique identification code corresponding to the express is put into the delivery terminal together with the express; the transfer station collects the express in the delivery terminal and completes the security check and destination classification at the end of delivery when the sender searches through the client terminal, and runs The courier terminal at the destination of the courier completes the delivery of the courier. This logistics system and method eliminates the need to fill in the form by hand, and does not require the courier to pick up the package one by one and scan the information, fast and automatic classification, low error rate, and high efficiency.

The invention discloses photocuring flexible resin for 3D (three dimensional) printing and a preparation method thereof. The photocuring flexible resin for the 3D printing is characterized by being prepared from the following raw material components in parts by weight: 20 to 80 parts of a monomer raw material, 30 to 70 parts of a resin raw material, 0.3 to 3 parts of an initiator, 0.02 to 0.08 part of a defoaming agent, 0.03 to 1 part of a leveling agent and 0.05 to 5 parts of a pigment. The photocuring flexible resin is obtained by mixing of the raw material components, low-speed stirring, high-speed stirring and screening. A resin product has high elongation at break and is proper in strength and hardness; the hardness is 45 to 55 A, and the elongation at break is 100 to 160 percent; the resin product has the advantages of bending resistance, high forming rate and high precision and can meet the requirements for production and manufacturing of products such as shoe materials, seal models, spacers and gaskets; meanwhile, the preparation method has simple and efficient steps and is extremely high in promotion space and market value.

The invention provides a device and a method for multi-mode broadcast short message receiving. The device for multi-mode broadcast short message receiving comprises a mobile communication broadcast short message receiving device, a beidou broadcast short message receiving device, and a control device, wherein the mobile communication broadcast short message receiving device is connected with the control device and is used for receiving broadcast short messages through a public mobile communication system under the control of the control device in a configured mode, the beidou broadcast short message receiving device is connected with the control device and used for receiving broadcast short messages through a beidou positioning and navigation communication system under the control of the control device in a configured mode, and the control device is used for confirming whether the broadcast short messages received by the mobile communication broadcast short message receiving device is processed or the broadcast short messages received by the beidou broadcast short message receiving device is processed. The device and the method for multi-mode broadcast short message receiving only have a broadcast message receiving function, can achieve a broadcast short message receiving terminal with a low size and low cost, and can be widely used for vehicles, ships and personnel handheld terminals.

The invention discloses an integrated governance device for electric energy quality. A static var generator, a fixed compensator and a thyristor control electric reactor are connected on a power grid between an electric network source and a load in parallel; the fixed compensator and the thyristor control electric reactor form a static var compensator; the thyristor control electric reactor takes idle work and negative sequence current between the static var generator and the fixed compensator as a compensation object; the static var generator takes reactive power between the electric network source and the static var generator as the compensation object to compensate the shortage after the static var compensator compensates; the static var generator takes a harmonic wave between the fixed compensator and the thyristor control electric reactor as a control object to filter the load and harmonic wave generated by the thyristor control electric reactor and compensate the other harmonic waves after the harmonic waves are absorbed by the fixed compensator. The integrated governance device can achieve compensation of the idle work, the harmonic waves and the negative sequence, is fast in compensation speed and good in effect; the capacity of the device is reduced, and the cost is saved at the same time.

The present invention provides a stationary satellite imaging navigation and registered attitude motion compensation method. The method comprises the steps of 1, analyzing the light path of the scanning reflection mechanism of a remote-sensing instrument, and writing an expression from the line of sight of an instrument imaging system to the emergent line of sight of the instrument; 2, adding a compensation amount to the corner of the scanning reflection mechanism of the remote-sensing instrument, and establishing a compensated emergent implementing expression of the instrument; 3, establishing an equation according to the fact the emergent line of sight of the instrument of the remote-sensing instrument with a non-compensated satellite zero-attitude instrument is equal to the emergent line of sight of the instrument having the attitude motion and with the compensation amount added to the scanning reflection mechanism, and then solving the expression of the compensation amount; 4, subjecting the expression of the compensation amount to simulation verification to ensure the derivation correctness. According to the invention, the influence of the satellite attitude motion on the sight pointing, imaging navigation and registration effects of the instrument can be avoided. Meanwhile, based on the method, the attitude problem can be solved in the more targeted manner. Therefore, the system development difficulty is reduced and the engineering realizability is improved.

The invention relates to a dilatational wave firearm. The technical scheme mainly includes that: a reaction gas discharge structure is composed of a flame vent hole which is on the firearm tube wall and connected with a bore, and a thrust jet connected with the flame vent hole, in the process from the begin of the internal trajectory to the end, the reaction gas, which goes from the bore and flame vent hole to the thrust jet connected with the flame vent hole, jets to form the counterforce which counteracts the recoil. The invention has the advantages that: 1. The invention not only can use whole combustible cartridge cases ammunition, but also can use the most common metallic cartridge case gun propellant fixed-loading charge at present. 2. The invention can use the single ignition, semi-automatic, automatic and other automatic modes, the problems of unlock, case-drawing and ejecting, prime, block and due out and so on can be solved the same as those in the common firearm, the invention can work in cartridge clip, ammunition drum, ammunition belt and other common prime again running fire types. 3. The invention can be applied for traditional self-propelled gun and tank whose gun breech is in the enclosed turret.

The invention discloses a primer group for detecting respiratory tract microorganisms based on a nanopore sequencing method. The nucleotide sequences of the primer group are as shown in SEQ ID NO:1-20. The microorganisms are streptococcus pneumoniae, staphylococcus aureus (resisting to methicillin), klebsiella pneumoniae, pseudomonas aeruginosa, acinetobacter baumannii, stenotrophomonas maltophilia, candida albicans, haemophilus influenzae, legionella pneumophila, enterococcus faecium, chlamydia psittaci, cryptococcus gattii, aspergillus fumigatus and pneumocystis jiroveci. According to the invention, sequencing optimization is carried out on different types of samples of the respiratory tract microorganisms, so that the detection method, the kit and the like are suitable for various typesof respiratory tract samples; and a targeted amplification method is adopted, so that the detection requirements of sputum, alveolar lavage and other sample types can be met. In addition, parallel sequencing can be performed, so that the flux of the detected samples is increased, the sequencing time is shortened, and the contradiction between the flux of detected pathogenic species and the cost and time is further relieved.

The invention discloses an invoice automatic grabbing and voucher inputting method and system and a storage medium. The method comprises the steps that login information, grabbing demand information and scripts of an RPA robot for logging in an electronic bookkeeping system are configured; the RPA robot automatically logs in the electronic bookkeeping system and obtains a general customer list; on the basis of an invoice capturing process, the customer list general table is traversed, and thus automatically searching and capturing invoice information belonging to the customer list general table from a third-party tax system; the RPA robot carries out sorting and posting on the invoice information of the clients according to different clients according to the voucher recording process, and bookkeeping vouchers corresponding to the clients are generated; and the plurality of accounting vouchers of each customer are used to form an electronic account set of each customer according to a preset format. Manual intervention is not needed, the RPA robot is adopted to automatically simulate manual operation to complete invoice grabbing and voucher inputting, processing is accurate and does not make mistakes, the work processing efficiency and value are greatly improved, and meanwhile the research and development difficulty and cost are low.

The invention discloses an adjustable convergence and diffusion tail spraying pipe. The adjustable convergence and diffusion tail spraying pipe comprises a subsonic speed spraying pipe, a supersonic speed spraying pipe and outer adjusting sheets with elasticity. Subsonic speed adjusting sheets and sealing sheets in the subsonic speed spraying pipe are hinged to the front ends of supersonic speed adjusting sheets and sealing sheets in the supersonic speed spraying pipe. The outer adjusting sheets with elasticity are an extension part of a machine body, an air pressure action cylinder is fixed to the middle portion of each outer adjusting sheet with elasticity, the rear ends of the outer adjusting sheets with elasticity are placed in grooves in the outer sides of the tail ends of the supersonic speed adjusting sheets through protruding lugs in a lapping manner, the protruding lugs on the outer adjusting sheets move in the grooves, and the section area of a spraying pipe outlet is limited. The convergence subsonic speed spraying pipe serves as a fixing convergence section. A multi-adjusting-sheet type spraying port is expanded in a stress application state, and a diffusion section isformed. The tail section of the spraying pipe is adjusted through a hydraulic method, the adjusting-sheet type spraying port is expanded in the stress application state, and the diffusion-section-shaped tail spraying pipe is formed. According to the adjustable convergence and diffusion tail spraying pipe, the structure is simplified, and the weight is reduced. It is guaranteed that gas can be sufficiently expanded so that thrust losses can be reduced, and the thrust utilization rate of an engine is increased.

The invention discloses a terrace flatly-buried type underground nuclear power station which comprises a nuclear island and a conventional island. Nuclear-related buildings of the nuclear island are arranged in a nuclear island cavern group of a mountain, the conventional island is arranged on a first conventional island area and a second conventional island area, the first conventional island area is located on a terrace platform on the upper portion of a side slope of the mountain, the second conventional island area is located on a ground platform on the outer side of the side slope, and the nuclear island cavern group is flatly buried in the side slope of the mountain relative to the second conventional island area. The terrace flatly-buried type underground nuclear power station is suitable for the terrain environment with the large platforms on the outer side and the upper portion of the side slope of the mountain or the terrain environment with the large platforms easily formed on the outer side and the upper portion of the side slope of the mountain in a hand excavation mode, and feasible general arrangement is provided for the underground nuclear power station. Compared with a ground nuclear power station, a main process system does not need to be greatly adjusted, and the technical development difficulty of the underground nuclear power station is lowered. Nuclear island plants are arranged in different underground caverns, and it can be guaranteed that the existing underground engineering technology meets the requirement that the nuclear-related buildings of the nuclear power station are arranged underground.

The invention provides a program design system, which comprises a registration unit, an identifier setting unit and a function call unit; the registration unit is used for registering existing functional modules to generate an identifier corresponding to each functional module; the identifier setting unit is used for parsing the business logic of a program to be designed, searching the identifiers corresponding to the business logic and setting the execution sequence and call relation between a plurality of functional modules corresponding to the identifiers according to the business logic; and the function call unit is used for calling the functional modules corresponding to the identifiers according to a setting result to realize the function of the program to be designed. The invention also puts forward a program design method. By means of the technical scheme of the invention, existing functions can be dynamically combined according to business requirements in order to satisfy the constantly changing execution flow of a customer.

The invention provides a very-high-pressure intercooling cycle turbofan engine. The engine comprises fans, a high-pressure air compressor, an intercooler, a very-high-pressure air compressor, a combustion chamber, a circular rotating fan transition section, a very-high-pressure turbine, a high-pressure turbine, a low-pressure turbine, a low-pressure shaft, a high-pressure shaft and a very-high-pressure shaft. The fans, the high-pressure air compressor, the intercooler, the very-high-pressure air compressor, the combustion chamber, the circular rotating fan transition section, the very-high-pressure turbine, the high-pressure turbine and the low-pressure turbine are connected in sequence. The very-high-pressure turbine drives the very-high-pressure air compressor to operate through the very-high-pressure shaft. The high-pressure turbine drives the high-pressure air compressor to operate through the high-pressure shaft. The low-pressure turbine drives the fans to operate through the low-pressure shaft. The rotation central axis of the very-high-pressure air compressor, and the axis of the combustion chamber are both parallel to the axis of the engine but not coincide with the axis ofthe engine. The high-pressure air compressor is composed of a multi-stage high-load axial flow air compressor and a single-stage high-through-flow centrifugal / oblique flow air compressor.

The invention discloses a cathode profile design and digital correction method for blade precision electrolysis. A cathode structure used for precision electrolysis forming of a compressor blade is very complex and comprises a pair of three-dimensional curved surface working cathodes, a sealing flow stabilizing structure, an electrolyte inlet / outlet, and an insulation protected special HSK hydraulic chuck; the formed cathode profile, namely the pair of three-dimensional curved surface working cathodes, is designed into initial profiles with different shapes through gap calculation, and the forming precision of the initial machining of the blade profile is guaranteed; and digital correction and repeated iteration are carried out by utilizing the reverse engineering principle, so that the requirement of non-allowance forming of the blade profile is finally met. The cathode profile design and digital correction method for blade precision electrolysis has the advantages that precise designand effective correction of the cathode of non-allowance precision electrolysis machining of the compressor blade are achieved, and the non-allowance machining of the blade profile is ensured; and the development difficulty and development period of the electrolysis process are both reduced, and the precision and controllability of iteration of the precision electrolysis process of the compressorblade are guaranteed.

The invention discloses a slope type horizontally-buried underground nuclear power station which comprises a nuclear island and a conventional island. A nuclear-related building of the nuclear island is arranged in a nuclear island cavity group of a mountain. The conventional island is arranged on a ground platform on the outer side of the mountain. The nuclear island cavity group is horizontally buried in a slope of the mountain relative to the conventional island. The slope type horizontally-buried underground nuclear power station is suitable for a terrain environment where a large ground platform is arranged on the outer side of the slope of the mountain or a terrain environment where a large platform can be formed easily by hand excavation on the outer side of the slope of the mountain; a feasible overall layout is provided for construction of the underground nuclear power station, the engineering economy is good, and the platform on the outer side of the slope is beneficial to construction and arrangement; a main process system does not need large adjustment relative to a ground nuclear power station, so that the technical research and development difficulty of the underground nuclear power station is lowered; since nuclear island plants are arranged in different underground cavities, it can be ensured that the existing underground engineering technology meets the requirement that the nuclear-related building of the nuclear power station is arranged underground.

The invention discloses a premix auxiliary material. The premix auxiliary material comprises polyvinylpyrrolidone, glyceryl behenate, and a pharmaceutical adjuvant filler and a pharmaceutical adjuvant disintegrant, wherein the weight ratio of the filler, the disintegrant, the polyvinylpyrrolidone and the glyceryl behenate is (80-98.5):(10-0.5):(5-0.5):(5-0.5). The premix auxiliary material comprising the polyvinylpyrrolidone and the glyceryl behenate is good in fluidity, strong in compressibility and good in lubricating effect. The mixing uniformity, the medicine content, the tablet hardness, and the like would not change with prolongation of the total mixing time. The premix auxiliary material is prone to enlargement. Indexes comprising fluidity, the Carr's index, compressibility, friability, etc. of the premix auxiliary material provided by the invention are superior to corresponding indexes of auxiliary materials mixed physically. Uncontrollable factors of the technology are reduced, thus facilitating large-scale production. The premix auxiliary material can be used for direct compression of tablets or encapsulation of capsules.

The invention discloses a speed increasing device for a wind generating set. The speed increasing device comprises a speed increasing gear mechanism and at least one hydraulic speed increasing unit; the input shaft of the speed increasing gear mechanism is connected with the input shaft of a wind wheel of the wind generating set; the hydraulic speed increasing unit comprises a hydraulic pump (1) and a hydraulic motor (2); the input shaft of the hydraulic pump (1) is connected with the output shaft of the wind wheel of the wind generating set; the oil inlet of the hydraulic pump (1) is communicated with an oil tank, and the oil outlet of the hydraulic pump (1) is communicated with the oil inlet of the hydraulic motor (2); the oil outlet of the hydraulic motor (2) is communicated with the oil tank; the output shaft of the hydraulic motor (2) is connected with the input shaft of a generator which is matched with the hydraulic motor (2); and the speed increasing device is high in generality, simple in structural design, low in failure rate and high in working efficiency and easy to manufacture and assemble. Moreover, the invention also provides the wind generating set comprising the speed increasing device.

The invention discloses a frequency selecting filter for configurable bandwidths and configurable frequency points. The frequency selecting filter comprises an operational transconductance amplifier OTA at a signal amplification and conversion front end, an adjustable input resistor Rin and an adjustable output resistor Rout, an adjustable transconductance operational amplifier array, an adjustable capacitor array and a control voltage output module, wherein the OTA realizes transconductance adjustability and the filter can be in cascade connection with the rear of arbitrary circuit without considering impedance matching; the adjustable input resistor Rin and the adjustable output resistor Rout are used for meeting the requirement of the interior of the filter for the impedance matching; the adjustable transconductance operational amplifier array realizes configurable frequency points of the filter; the adjustable capacitor array realizes configurable bandwidths of the filter; the control voltage output module is used for providing a control voltage required by the OTA; the adjustable transconductance operational amplifier array, the switch tube and the capacitor array are matched with one another. The frequency selection of a wireless communication system does not depend on a frequency mixer any longer, the defect that a specific chip is only used for a specific system is overcome, the filtering and frequency selecting functions are integrated, and a majority of frequency points and bandwidths applied to a wireless communication private network are covered.

The invention provides a loop design method for a double-closed-loop BUCK converter based on frequency domain analysis, and the method comprises the steps: taking an average current mode BUCK converter as a model, and carrying out the system analysis of the model; deducing the transfer function of the system through a model analysis result, and performing frequency domain analysis on the basis ofthe obtained transfer function; carrying out current loop compensation design according to a frequency domain analysis result; on the basis of current loop compensation, performing voltage loop compensation design; and according to the current loop compensation and the voltage loop compensation, obtaining the double-closed-loop BUCK converter added with the double-loop compensation. Meanwhile, theinvention provides the double-closed-loop BUCK converter based on frequency domain analysis, which is designed by adopting the loop design method. The average current type double-closed-loop BUCK converter is designed by selecting proper current loop compensation and voltage loop compensation, correctness and feasibility of the average current type double-closed-loop BUCK converter are verified through simulation, and research and development difficulty and research and development period of a switching power supply are greatly reduced.

The invention discloses a method for designing a quasi-gliding trajectory based on landing angular velocity constraint, which comprises the following steps of: constructing a simulation model to forma quasi-gliding trajectory with a climbing stage, a maneuvering guidance stage and an aiming stage; initializing design parameters of the aircraft model; after the aircraft model simulates flight on the quasi-gliding trajectory according to the initialized design parameters and preset control conditions, the actual landing speed, obtaining the actual firing range and the trajectory of the quasi-gliding trajectory of the aircraft model; judging whether the actual falling speed, the actual firing range and the form of the trajectory formed in the maneuvering guidance stage meet preset conditionsor not, and if so, determining that the corresponding design parameters meet expectation; if not, correspondingly updating the design parameters, and enabling the aircraft model to simulate flight again on the simulated gliding trajectory according to the updated design parameters until all the design parameters meet the expectation; and outputting the design parameters updated last time to finish the design of the simulated gliding trajectory.

The invention provides a three-dimensional display device. The three-dimensional display device comprises a first transparent conductive layer, a fresnel lens complementation layer and a second transparent conductive layer in an overlapped mode, the surface, facing the first transparent conductive layer, of the fresnel lens complementation layer is a concaved surface, the three-dimensional display device further comprises a liquid crystal layer, the space between the concaved surface and the first transparent conductive layer is filled with the liquid crystal layer, and the liquid crystal layer is a perpendicular orientation type liquid crystal layer. Through the arranged fresnel lens complementation layer, the arch height of a lens is reduced, response time of liquid crystal molecules in the liquid crystal layer is shortened, and the problem that the response time of the liquid crystal molecules is too long is effectively solved; by making the fresnel lens into the fresnel lens complementation layer in a reverse form, it is not needed to increase the refractive index of the fresnel lens complementation layer; a common fresnel lens material is adopted, the perpendicular orientation type liquid crystal layer is combined, in this way, the three-dimensional display device achieves switching between 2D and 3D, and then the research difficulty and cost of the fresnel lens material are lowered.

The invention discloses a SLA elastic photosensitive resin for 3D printing. The SLA elastic photosensitive resin for 3D printing is prepared from the following raw materials in parts by weight: 30-80parts of a monomer raw material, 10-70 parts of a resin raw material, 5-30 parts of toughening rubber, 2-20 parts of toughening microspheres, 0.5-5 parts of an initiator, 0.01-0.1 part of a defoamer,0.03-1 part of a flatting agent and 0.02-5 part of a pigment. The SLA elastic photosensitive resin is prepared by mixing the raw material components and stirring, defoaming and screening the mixture.The resin product is excellent in resilience and flexure resistance and has a silica gel-like texture. The elongation at break is 200-250%, the hardness is 35-45A, the resin is free of shrinkage distortion, high in printing success rate and high in surface precision, can be used for rollover manufacturing by replacing silica gel and can meet the production and manufacturing demands of products such as shoe materials and spacers and washers.

The invention provides a method for measuring pretension of a tensioned membrane structure, which comprises the following steps of: 1. shooting a particle globule into a tension membrane surface with a fixed border and rebounding the globule; 2. meanwhile, measuring the shooting speed v0 and the back-shooting speed vt of the globule in the tension membrane surface with a fixed border; 3. measuring the shooting speed v0 and the back-shooting speed vt of the globule in the tension membrane surface with the same fixed border; shooting the same point of the membrane surface at different shooting speed and measuring the other group on shooting speed v'0 and back-shooting speed v't; 4. substituting the two groups of shooting speed and back-shooting speed (v0, vt) and (v'0, v''t) into the formula vt = k'v0+c=f(sigma0x, sigma0y) v0+g (sigma0x, sigma0y) and solving to obtain k' and c; and 5. obtaining the pretensions sigma0x and sigma0y of a membrane material by searching the regression coefficient table of vt=k'v0+c under the membrane material pretension grade. By means of the method in the invention, based on numerical analysis and theoretical demonstration, the direct relation among shooting speed, back-shooting speed and membrane surface pretension is found out, a specific method is provided for obtaining the pretension of the membrane material just by measuring shooting speed and back-shooting speed, and the feasibility of the method is verified by calculation instances.

The present invention provides an MMC sub-module capable of clearing obstacles and a converter having the sub-module. The MMC sub-module capable of clearing obstacles of the present invention mainly includes: 3 switch units, 1 diode and 1 capacitor, wherein The structure of the switch unit is the same, which is composed of a fully-controlled power electronic device and a diode in antiparallel connection; the structure of the converter with the ability to clear obstacles is a symmetrical three-phase structure, and the upper and lower bridges of each phase The arms are composed of more than two MMC sub-modules with obstacle-clearing capabilities connected in series with inductors. The MMC sub-module with the ability to remove obstacles and the converter device with the sub-module of the present invention have a small number and simple control, and can quickly clear the fault current when a unipolar short-circuit fault or a bipolar short-circuit fault occurs on the DC side, and It can realize fast restart under instantaneous fault, effectively guaranteeing the stable operation of the system.