99results about How to "Achieve hold" patented technology

The invention relates to a polypropylene foaming material for opening aperture and a preparation method thereof, which pertains to the polymeric material field and aims at solving the disadvantages of the existing foaming material for opening aperture of high technological cost, difficulty in recovery, environmental pollution and complicated operation. The foaming material of the invention consists essentially of polypropylene resin composition, and the composition consists of polypropylene A with a melt flow velocity of 0.01 to 10g/10min, polyethylene B with an Mw of 600,000 to 5,000,000, a compatilizer C and a normal additive; the additive accounts for no more than 10 weight percent, and B accounts for 1 to 40 weight percent while C accounts for 0 to 5 weight percent in the mixture of A, B and C. The composition is heated over the molten temperature thereof in the invention, a physical foaming agent with 1 to 20 percent of the melt in weight is injected under the pressure larger than the pressure of the melt, then the mixture is exposed under the environment with a pressure lower than the pressure of the composition melt, thus the polypropylene foaming material for opening aperture is prepared. The invention has the advantages of low cost, simple operation, no pollution, uniform and unblocked foam pores, and the opening percentage of at least 50 percent.

The invention relates to an inversion projection transformation based lane keeping method. The inversion projection transformation based lane keeping method mainly comprises the following steps of performing inversion projection transformation on shot perspective drawings according to intrinsic parameters of a camera and converting into vertical views; detecting lane lines and extracting lane central lines based on the vertical views and computing and setting distance between corresponding endpoints of area central lines; judging whether an automobile has lane departure or not due to compare between the distance and threshold values. The inversion projection transformation based lane keeping method has the advantages of overcoming a traditional lane keeping system disadvantage that the lane lines are not benefited to judge due to direct extraction of the vertical views, accurately judging whether the automobile has lane departure or not and achieving lane keeping.

The invention provides an image local structure self-adaption recovery method based on a non-continuity indicator. The image local structure self-adaption recovery method based on the non-continuity indicator comprises the first step that a read image is initialized and an input RGB image is converted to a YCbCr color space; the second step that a trilateral scatter matrix is built and robustness to noise is improved; the third step that the non-continuity indicator is built to represent image local structure characteristics dynamically; the fourth step that an image degradation model is built; the fifth step that an image recovery optimization model is built according to the built non-continuity indicator, and the built model depends on the image local structure characteristics continuously; the sixth step that the recovery optimization model is resolved through a variational method, a gradient descent flow corresponding to the optimization model is obtained and is discretized through the half-point format, and an optimal recovery image is obtained. According to the image local structure self-adaption recovery method based on the non-continuity indicator, the recovery process can be controlled in a self-adaption mode according to the image local structure characteristics, more detailed structures of the image can be recovered, and the quality of the image is improved remarkably.

The invention discloses a position maintaining method and system under a fault mode of an electric thruster of a full-electric propulsion satellite. The method comprises the following steps that whencertain electric thruster of the full-electric propulsion satellite has a fault, a branch including the electric thruster is not used any longer, and two electric thrusters in the other branch are used to carry out position maintenance control by that 1) controlled variables needed by essential track factors are calculated according to orbit measurement data; 2) a controlled variable of the totaleccentricity vector is calculated according to a controlled variable of an inclination angle and north-south and east-west position maintaining coupling relation; 3) a drift angle of an electric thruster ignition position is calculated; 4) the ignition speed increment and the middle-point right ascension of an ignition arc are calculated; and 5) ignition time and time length of the electric thruster are calculated. The method and system are suitable for autonomous calculation on the satellite, the problem in maintaining the position in the fault mode of the electric thruster is solved, and thepropellant utilization efficiency is higher.

The invention discloses a relative formation flying and position transfer controlling method based on a relative orbit element. The method comprises long-term formation flying control near a given formation flying point and position transfer control among different formation flying points. Compared with the prior art, the relative formation flying and position transfer controlling method based on the relative orbit element has the advantages of being capable of achieving the control of formation flying, approaching and retreating based on the relative orbit element, achieving the establishment and maintenance of a relative formation flying state between two spacecrafts, and providing conditions for the close space missions.

The invention provides a mouth opener allowing opening degree to be adjusted. The mouth opener comprises an upper jaw supporting plate, a lower jaw supporting plate, an upper retainer, a lower retainer, a rotating bar, a connecting box, a motor and a handle. The front end of the upper retainer is detachably connected with the upper jaw supporting plate; the rear end of the upper retainer is connected with the connecting box; the front end of the lower retainer is telescopically connected with the lower jaw supporting plate; the rear end of the lower retainer is hinged to one end of the rotating bar; a worm gear and worm matching with each other are disposed inside the connecting box; the rotating bar is connected with the worm gear through a driven shaft arranged in the axis of the worm gear; the rotating bar is perpendicular to the driven shaft; the worm is connected with a motor which provides power; the handle is arranged under the connecting box. The mouth opener has the advantages that the opening degree of the mouth can be automatically controlled and retained, ensuring opening precision and opening convenience; the components are easy to replace, ensuring usage for various types of patients in the rehabilitation period and ensuring high efficiency and low cost; the mouth opener is convenient for the patient to hold by hand for use.

The present invention provides a split prevention method of stitches and a split preventor of the same. According to the invention, a wire hook is configured at the back side of a needle dropping position. The wire hook swings at a state that a curved needle enters after sewing. A hook part at the front end of the wire hook is next to the back side of the curved needle for keeping a needle wire ring in a plurality of needle wire rings, which is captured by the curved needle and is provided at an inlet side. According to the invention, the sewing of at least one needle amount is performed at this state so the needle which descends to the needle wire ring that is kept by the needle hook passes through. The needle wire which is kept by the needle is used for performing self-connection for the needle wire rings, and breaking-off of the bending needle wire is prevented through pressing the bending needle wire by a self-connection part. The split which is specific in the stitches of the double-wire whipstitch can be effectively prevented.

The invention discloses a reciprocating progressive self-adaptive feed control method for an electrical spark machine tool. A tool electrode in the electrical spark machine tool is controlled to perform a reciprocating progressive feed motion with a workpiece in an integral manner of reciprocating motion and progressive motion or in a separated manner of reciprocating motion and progressive motion so as to realize high-efficiency and high-quality electrical spark machining of a difficult-to machine material, particularly a semiconductor material, with a metal material. An appropriate discharge gap is automatically formed between the workpiece and the tool electrode, so that normal electrical spark discharge is promoted, continuous machining is ensured, and the method has the beneficial effects of quick chip removal and cooling, preventing the electrode from burning, improving the quality of machining surface, improving the machining efficiency, being wide in application range and the like.

The invention relates to a multi-intelligent-body reconfigurable assembly and a multi-degree-of-freedom attitude adjusting system, and aims at the transfer and attitude adjustment requirements of large-size, large-load and heterogeneous high-end equipment in a large-range complex environment through different numbers of AGVs in a combined splicing layout cooperative motion mode of Chinese character lv, Chinese character delta, Chinese character tian and other special shapes. Meanwhile, an automatic leveling two-shaft overturning scheme based on a high-damping shock absorption system is carried, and the influence of displacement caused by climbing and uneven road surfaces on equipment is eliminated; mechanical splicing devices, wireless communication devices and laser range finders are arranged among the AGVs to realize a high-precision synchronous working scene of dynamic detection and real-time correction, so the flexibility degree of intelligent equipment is improved, manual labor in the product transfer and butt joint process is reduced, resource waste caused by a traditional transfer mode is avoided, and efficient application of collaborative operation of the intelligent equipment in a precise transfer link is realized.

The invention discloses an unmanned aerial vehicle wing changing mechanism with two wings capable of changing sweepback angles synchronously and coaxially in the same plane and belongs to the technical field of unmanned aerial vehicle structural design. The unmanned aerial vehicle wing changing mechanism comprises an upper supporting board, a lower supporting board, a rotary haft, a right wing support, a left wing support, a spring, a protruding block, a limiting hook, a rack A and a rack B. The rotary shaft is connected with the lower supporting board, the left wing support, the right wing support and the upper supporting board from bottom to top. The spring is arranged between the left wing support and the lower supporting board. The rotary shaft is sleeved with the spring. By the adoption of the unmanned aerial vehicle wing changing mechanism, wings of an unmanned aerial vehicle can be folded to be stored, the storage space is reduced, and the wings can be barreled; the wings can be rapidly unfolded in the launching stage of the unmanned aerial vehicle, lift force can be established rapidly, and the situation that the height of the unmanned aerial vehicle is reduced, and even the unmanned aerial vehicle crashes can be effectively prevented; the two wings of the unmanned aerial vehicle are changed synchronously and coaxially all the time, the two wings are located on the same plane rapidly after the unmanned aerial vehicle is launched, the interference yawing moment in the transverse lateral direction can be reduced as much as possible, and control is convenient.

The invention discloses a water-soluble electrolyte system and application of a water-soluble electrolyte system in an electrochemical oxygen sensor, relates to electrolyte and application thereof and aims to solve the problem of sensor failure caused by easy water volatilization in the existing electrolyte system. The water-soluble electrolyte system consists of an electrolyte material and a support material, wherein the electrolyte material is water; the support material is hydrophilic ionic liquid; the hydrophilic ionic liquid is placed in the environment with a certain humidity and the water is naturally absorbed until the hydrophilic ionic liquid is constant in weight so as to obtain the water-soluble electrolyte system. The invention also discloses application of the water-soluble electrolyte system which is used as electrolyte in the electrochemical oxygen sensor. The water-soluble electrolyte system has the advantages that the water electrolyte material is absorbed and maintained by using the relatively strong water absorption property of the hydrophilic ionic liquid, so that the problems of poor performance and short service life of the sensor caused by volatilization of the water electrolyte can be avoided.

The invention discloses a drainage basin water ecological restoration system based on water conservancy allocation. The drainage basin water ecological restoration system comprises a sewage purification filter pond and flood storage irrigation and drainage wetlands, the sewage purification filter pond is arranged at a sewage outlet of a river, an aerobic treatment chamber, an anoxic treatment chamber and a baffling anaerobic chamber are sequentially arranged in the sewage purification filter pond from left to right, and a baffling plate is arranged in the baffling anaerobic chamber; a water pump and an ejector are arranged, so that anoxic-anaerobic-aerobic continuous circulation is realized in a space sequence; the flood storage irrigation and drainage wetlands are arranged on the two sides of a river embankment, each flood storage irrigation and drainage wetland comprises a second pond body, a filter tank and a water collecting pond, a water distribution chamber, a surface flow wetland chamber, a subsurface flow wetland chamber and a water outlet chamber are arranged in each second pond body, and pollution factors in the water body are removed under the action of matrix filler and plants. Source control and sewage interception are achieved through the sewage purification filter tank, water conservancy allocation and ecological restoration are achieved through the flood storage irrigation and drainage wetlands, and development and allocation of water resources are promoted through water quality purification and maintenance.

The invention relates to an orbit keeping method of a double-satellite system, in particular to a method for adopting a linear quadratic type regulator for tracking control and achieving double-satellite system orbit keeping, and belongs to the technical field of aerospace. The implementation method comprises the steps of using a simplified two-body kinetic model to design a nominal orbit, then obtaining an actual orbit with an initial value of the nominal orbit under a precise two-body kinetic equation, calculating the deviation of the actual orbit and the nominal orbit, designing an optimalcontrol law based on the linear quadratic type regulator to obtain optimal accelerated speed, and applying continuous control to make the actual orbit converged around the nominal orbit, so that orbittracking and keeping under the double-satellite system is achieved. The method for adopting the linear quadratic type regulator for tracking control and achieving double-satellite system orbit keeping is applicable to double-satellite system orbit keeping under the condition of the presence of initial errors and model errors, and has the advantages of being high in convergence, high in keeping precision and the like.

The invention provides a measurement system and method for dynamic sliding friction coefficients. The system comprises a parameter loading system, a power supply device connected with the input terminal of the parameter loading system, a sensor signal reading system connected with the output terminal of the parameter loading system, and a data processing system connected with the sensor signal reading system 3. The system and the method solve the technical problems of strict experiment requirements, less measured coefficients and narrow sliding velocity load range in the existing measurement system and method for sliding friction coefficients. The system and the method have the advantages that the change rule of sliding friction coefficients along with load, sliding velocity, rough pavement, rubber property and temperature can be tested, and the continuous loading and keeping of vertical load, sliding velocity and temperature are realized.

The invention discloses a live bacterium cultivation and examination box for medical examination. The live bacterium cultivation and examination box comprises a box body, a cultivation box body is arranged in the box body, an aeration pipe is arranged in the cultivation box body, heat dissipation water pipes are arranged in the cultivation box body, heat dissipation fins are arranged on the heat dissipation water pipes, a culture medium mixing box body is arranged on one side of the cultivation box body, a fixed liquid pumping pipe is arranged in the cultivation box body, the upper end of thefixed liquid pumping pipe is connected to an electric push rod through a fixing frame, the upper end of the fixed liquid pumping pipe is connected to an examination box body through a rubber pipe, anexamination box water pump is arranged in the examination box body and is connected to the rubber pipe, and a display screen and a control keyboard are arranged on the surface of the examination box body. The live bacterium cultivation and examination box has the advantages that the live bacterium cultivation and examination functions can be achieved, different environmental conditions for the live bacterium can be maintained and adjusted, the environment requirements of different live bacterium can be met, on-line real-time detection can be realized, the control is convenient, and the use isconvenient and rapid.

The invention discloses an aircraft guidance and control integrated design method based on a preset time sliding mode, and belongs to the technical field of aircraft guidance and control. The method comprises the following steps: establishing a guidance and control integration-oriented nonlinear mathematical model of an aircraft; designing an extended state observer, and observing the total disturbance within a preset time; and designing a sliding mode controller, and realizing compensation of observation disturbance and convergence of a control quantity within a preset time. According to the invention, the expansion state observer is designed by applying a preset time theory, so that the observer completes disturbance observation within a preset time; the state tracking and keeping in the preset time are realized; according to the method, convergence is controlled in the preset time, the system state convergence time is not affected by the initial state of the system, the parameters can be preset, and the time delay problem between a guidance loop and a control loop is eliminated on the basis that coupling between aircraft channels is fully considered by using a full-state coupling guidance control integrated architecture.

The invention relates to a single-drive omnidirectional AGV car body device, which includes a driving wheel, a driving motor, a first speed reducer, a first transmission gear assembly and an overrunning clutch. The driving wheel is installed on the first speed reducer, and the first speed reducer is connected to the The drive motor drives the first reducer and the drive wheel to rotate, and drives the overrunning clutch to rotate through the transmission of the first transmission gear assembly; it also includes a servo motor, a second reducer, a second transmission gear assembly, T-shaped nuts and lifting gears. For the lifting plate, the servo motor is connected to the second reducer and drives the second reducer to rotate, and the T-nut and the lifting plate are driven and controlled through the second transmission gear assembly to perform lifting motion. The AGV trolley of the present invention can run in any direction under a single driving condition, and can choose to keep the attitude of the material rack unchanged during operation according to requirements.

The invention discloses a preparation method of a silicon-carbon composite material, the silicon-carbon composite material and application thereof, and the preparation method comprises the following steps: mixing a carbon source and a silicon source according to a certain proportion, and coating the silicon source with the carbon source to obtain a carbon-layer-coated SiO2/C composite material; putting the obtained SiO2/C composite material and a reducing agent into a reaction kettle for reaction, and naturally cooling to obtain a product SiOx/C; and carrying out acid pickling, etching, washing and drying on the obtained product to obtain the SiOx/C composite material. According to the method, the SiOx material can be simply and conveniently prepared, the expansion effect of the SiOx material can be relieved, and the conductive effect is improved. In addition, the SiOx/C composite material prepared by the method can keep the morphology of a precursor silicon source, and has certain advantages for preparing the SiOx/C material with special morphology. The SiOx/C composite material with different morphologies prepared by the method is used as a lithium ion negative electrode material, and the cycle performance of a lithium ion battery can be remarkably improved.

The invention discloses a nursing device for an anesthesia recovery period. The nursing device comprises a bed plate; an adjusting assembly and a jacking assembly are arranged on the bed plate; the adjusting assembly is provided with an adjusting plate; an arc-shaped guide plate is fixed to the lower end face of the adjusting plate; a vertical plate is arranged at the end of the bed plate; a rotating shaft is arranged on the end face of the vertical plate and is connected with the guide plate through an L-shaped connecting handle; the adjusting plate, the guide plate and a connecting plate can rotate along with the rotating shaft; the center line of the rotating shaft and the upper end face of the bed plate are coplanar; a guide groove is formed in the guide plate and is of an opening structure at the edge of the guide plate; the jacking assembly is arranged on the portion, located on the inner side of the adjusting assembly, of the bed plate and comprises a jacking block; the upper end of the jacking block is provided with an arc-shaped structure; a transverse rod is arranged on the end face, facing the adjusting plate, of the jacking block; and when the adjusting plate is in a horizontal state, the jacking block moves up and down to enable the transverse rod to be clamped into a guide groove from the lower portion. According to the invention, the nursing effect can be effectively improved, and the labor amount is reduced.