8results about How to "Low cost advantage" patented technology

The invention provides a biodegradable ammonium persulfate coating gel breaker for fracturing operation and a preparation method of the biodegradable ammonium persulfate coating gel breaker. The preparation method comprises the following steps: determining a mass ratio R of rosin glyceride to ethyl cellulose according to a target reservoir temperature T, and calculating a coating weight gain ratio coefficient K and the total mass of a coating material according to target delayed gel breaking time t; preparing a core material ammonium persulfate into a water phase, and emulsifying in an oil phase to form a reversed-phase microemulsion; a gradient interface deposition method is adopted, a coating solution A prepared from rosin glyceride and part of ethyl cellulose and a coating solution B prepared from the remaining ethyl cellulose are dropwise added in sequence, and a coating material is sequentially deposited on a core material liquid drop interface through pressure reduction to form a compact bottom layer and a slow-release main body layer; according to the invention, the coating layer is biodegradable, chlorine-free and corrosion-free, through the cooperation of the material ratio and the process, the accurate and controllable delay of the gel breaking time at high temperature is realized, the reservoir is effectively protected, and the fracturing effect is improved.

The present application relates to a kind of based on the shape modulation coding of sub-field of view aliasing image target recognition and positioning algorithm, it is related to aliasing image target recognition, field of view determination and positioning technical field, solve the technical problem that the scale of detector and field of view cannot be considered under the condition of limited detector in prior art when realizing large field of view, high-resolution imaging;The algorithm includes the following steps: foreground target recognition;Target rotation state tracking;Target motion trajectory and spot shape change trend correlation discrimination and actual spatial position inverse solution.The present application is based on the shape modulation coding of sub-field of view aliasing image target recognition and positioning algorithm, with the advantage of small target surface detector low power consumption, low cost, realize space-based early warning large width detection, break through the bottleneck that the large field of view imaging of infrared optical system is limited to the manufacturing process of infrared detector.The present application is realized by the extraction of continuous frame spot shape feature and trajectory-shape dual-domain correlation modeling, the unique determination of the field of view of target space and high-precision positioning.

The application relates to the technical field of motor servo control, in particular to a motor driving method, a steering engine driving chip and a robot joint module, which comprises the following steps: receiving a serial digital instruction through a single-wire digital bus interface; performing serial-parallel conversion on the serial digital instruction to obtain parallel binary data representing a target angle; inputting the parallel binary data representing the target angle into a digital-analog conversion circuit to obtain an analog target voltage; collecting a position feedback voltage output by a position sensor; obtaining an error voltage according to the position feedback voltage and the analog target voltage; and driving and controlling a motor based on the error voltage. Thus, high-precision analog servo control is realized through angle digital instruction input, and angle and force dual-channel analog output is realized without increasing the number of DACs under the condition that the chip area is limited.

The utility model belongs to the technical field of water treatment relates to a kind of domestic ceramic membrane purifier, including filter element, filter drum and two end caps, and the end cap of two ends is respectively provided with water inlet and water outlet and is connected with the porous channel in filter element, water outlet connected with the water purification channel outside filter element is provided on the filter drum, the both ends of the filter drum are fixed with connecting ring, the inner wall end portion of the connecting ring away from filter drum is provided with first taper surface, the inner wall end portion of the end cap close to filter drum is provided with second taper surface, the first taper surface, second taper surface and filter element outer wall form sealed cavity, O-ring is provided in the sealed cavity, the contact surface of O-ring and first taper surface, second taper surface and filter element outer wall all form sealing structure.The domestic ceramic membrane purifier provided by the utility model has the advantages of simple structure, small pollution, high flux, long service life and low use cost.

The invention relates to a self-adaptive quantum random number generation method based on real-time entropy estimation, and belongs to the technical field of quantum random number generation. According to an existing integrated quantum random number generator, due to the non-stationary characteristic of a physical entropy source, the entropy rate dynamically drifts, and after-processing parameters are fixed, randomness safety and generation efficiency are difficult to guarantee at the same time. According to the method, the state transition probability of the original random bit stream is counted in real time, the confidence interval correction is introduced to calculate the minimum entropy, the input bit width is dynamically adjusted accordingly, the Toeplitz matrix is reconstructed for random extraction, and self-adaptive adjustment of the compression ratio is achieved. According to the method, the compression ratio is increased to ensure the security of the output random number when the entropy source quality is reduced, and the compression ratio is reduced to improve the generation efficiency when the entropy source quality is improved, so that the dynamic balance between the randomness security and the generation efficiency is realized on the premise of keeping integration and low cost.

The invention belongs to the technical field of durability of concrete materials, and particularly relates to marine microorganism self-healing coral aggregate concrete and a preparation method thereof. The coral aggregate concrete is prepared from coral particles, a composite cementing material, a bacillus inoculant, a composite calcium source, a water reducing agent, a microbial nutrient matrix, a defoaming agent and deionized water according to the proportion of (800 g to 1000 g): (440 g to 460 g): (100 mL to 200 mL): 10 g: 2 g: 30 g: 2 g: (270 mL to 290 mL). The bacillus inoculant is prepared from bacterial spores with the salinity tolerance of 3%-6% and the mineralization deposition rate of 1 g / L-6 g / L. The concrete aims at micro cracks with the width of 0.1-0.5 mm, the repair rate of the crack area reaches 95% or above, the cracks are completely closed after 28 days, and calcium carbonate precipitates are tightly combined with a concrete matrix; based on a crack water permeation resistance test, the relative water permeability coefficient is reduced by 90% or above compared with common coral aggregate concrete.

The invention discloses a semiconductor structure and a corresponding chip and product. The structure comprises a silicon-based integrated circuit and a bump structure arranged on the silicon-based integrated circuit. The bump structure sequentially comprises a UBM layer, a copper conductor layer, a nickel conductor layer and a gold conductor layer. The exposed side walls of the UBM layer, the copper conductor layer and the nickel conductor layer are coated with a metal protection layer composed of palladium, palladium alloy, platinum or platinum alloy, and the protection layer does not cover the gold conductor layer. According to the preparation method, the step-shaped side wall is formed through etching steps in a specific sequence, selective self-growth of the protective layer on the titanium / copper / nickel side wall is achieved through chemical plating based on metal equilibrium potential difference, and the protective layer is not deposited on the gold surface. The problems of poor welding and short circuit caused by oxide generated by side wall oxidation and copper diffusion of the copper-nickel-gold bump are effectively solved, the long-term reliability is remarkably improved, meanwhile, the using amount of precious metal is small, the technology is ingenious, and the method is particularly suitable for the high-end display field of liquid crystal driving chips and the like.

The back locking device comprises a middle frame, a handle seat assembly, a ball lock shell, a clutch assembly and a rotary knob assembly, the middle frame is provided with an installation hole and two first inserting grooves formed in the inner wall of the installation hole, the handle seat assembly is rotationally installed on the installation hole and provided with two second inserting grooves, and the ball lock shell and the clutch assembly are connected through the second inserting grooves. One part of the second slot and the first slot can be enclosed to form a clamping cavity; the ball lock shell is fixed to the handle base assembly, the ball lock shell and the handle base assembly define a containing space, the ball lock shell is provided with an embedding hole communicating with the containing space and two third inserting grooves, and the other part of each second inserting groove and the corresponding third inserting groove define a guide channel; the clutch assembly comprises an elastic piece and a clutch piece, the clutch piece comprises a clutch body and two supporting arms which are both arranged on the clutch body in a protruding mode, the elastic piece is arranged between the clutch body and the handle base assembly in a clamped mode, and the two supporting arms are inserted into the two guide channels respectively; one end of the knob assembly is connected with the clutch piece, and the other end of the knob assembly penetrates through the embedding hole and then protrudes out of the ball lock shell.