192results about How to "Small range of variation" patented technology

The invention relates to a preparation method for phase-change asphalt pavement material and is characterized in that the method comprises the following steps: (1), the preparation of phase-change asphalt modifier: firstly, selecting the materials based on the mass ratio among phase change material, coagulant, support material and coupling agent which is equal to 100:1-5:10-50:1-5; secondly, adding the phase change material into the silica sol, and then adding the coagulant dropwise to form gel; drying the gel, cooling the gel to room temperature and then taking out and mashing the gel to get powder through mixing; vacuuming the powder at 30-50 DEG C for 2-4 hours, then adding the support material under the protection of shielding gas; at 80-100 DEG C, adding the coupling agent for hydrophobic modification; then granulating to get the phase-change asphalt modifier; (2), the preparation of phase-change asphalt pavement material: firstly, selecting the materials based on the mass ratio among coarse aggregate: fine aggregate: filler, asphalt, fiber and phase change asphalt modifier which is equal to 100:10-20:1-8:2-6:0.2-0.5:2-10; then stirring the materials to get the phase-change asphalt pavement material. The phase-change asphalt pavement material prepared through the invention can improve the high temperature stability of pavement surface.

A distributed power system, wherein a backup boost transformer is connected between a PFC transformer and a FE DC transformer. The backup boost transformer is also parallel connected with a diode. The backup boost transformer only operates in the sustaining time, if the first DC voltage drops gradually, the backup boost transformer will increase this first DC voltage and stabilize it at a preset voltage of the FE DC transformer. Therefore, the capacity of the storage capacitor of the PFC transformer can be fully utilized to have a longer sustaining time and decrease the variation range of the second DC voltage so as to enhance the efficiency and power density thereof.

The invention relates to the technical field of offshore wave power generation, in particular to a floating type wave energy convertor. The floating type wave energy convertor comprises a buoyancy pontoon, a hydraulic cylinder, a flow calibration valve set, a high-pressure accumulator, a low-pressure accumulator, a hydraulic motor, an electric generator and a stabilization device, wherein a piston rod is arranged at one end of the hydraulic cylinder, and the extending end of the piston rod is fixedly connected with the buoyancy pontoon; an upper end port and a lower end port of the hydraulic cylinder are connected with the flow calibration valve set through pipelines; the high-pressure accumulator is connected with a hydraulic inlet of the hydraulic motor through a pipeline; the low-pressure accumulator is connected with a hydraulic outlet of the hydraulic motor through a pipeline; the hydraulic motor is connected with the electric generator through a shaft; and the stabilization device is fixedly connected with the bottom of the hydraulic cylinder. The stability of power output of the electric generator of the wave energy convertor can be improved, the energy conversion efficiency is improved, the change range of output voltage of the generator is narrowed, and design and development of a power convertor are facilitated.

The invention discloses a process control method of copper chemical mechanical polishing (CMP). A detection region consisting of a plurality of parallel copper metal wires is arranged in a sample wafer; the thickness of the copper metal wire in a monitor region of sample wafer in the current batch of wafers is measured before and after the CMP; the average material removal rate of the sample wafer is calculated according to the difference value of the two thickness values; the material removal rate obtained by calculation is compared with a target material removal rate so as to determine a time compensation value; and the time length of the CMP is adjusted according to the time compensation value and the CMP processing is performed on the next batch of wafers by using the adjusted time length. The invention also discloses a process control system of the copper chemical mechanical polishing. Through the scheme of the invention, the accuracy of thickness measurement is greatly improved, so that the time length is more accurately adjusted.

The embodiment of the present invention provides a multi-connection adjustment method and system, wherein the method includes: obtaining the temperature value set by the user and the air inlet temperature value of the indoor unit; Generate first control information based on the size relationship between wind temperature values; adjust the opening degree of the first electronic expansion valve of the indoor unit according to the first control information. The multi-connection adjustment method and system provided by the embodiments of the present invention can realize the flexible regulation of the multi-connection indoor unit according to the change of the indoor temperature, reduce the variation range of the indoor temperature, improve the comfort, and enhance the control stability and reliability of the multi-connection system sex.

The invention discloses a quadruped robot gait control method based on reinforcement learning and a CPG controller. The quadruped robot gait control method comprises the steps that S1, building a single-leg model and an overall model of a quadruped robot; S2, constructing an actor neural network and a reviewer neural network to train the single-leg model; S3, determining a relative sequential relationship between legs of the quadruped robot and constructing a controller model according to leg movement characteristics; and S4, constructing a foot end motion trail model of the quadruped robot from an output signal of the controller model through mapping transformation, and taking the output of the foot end motion trail model as a gait control signal of the quadruped robot to drive the quadruped robot. According to the method, it is guaranteed that legs of the quadruped robot move strictly according to the time sequence, the gait characteristic of mammals is achieved, meanwhile, it is guaranteed that the trunk of the robot is stable in the moving process, the pitch angle and the lateral angle change range is small, and overturning is effectively prevented; the leg movement has self-adaptability, and a complex control and planning algorithm does not need to be artificially designed.

The invention discloses a frostless refrigerator capable of defrosting through coupling of ultrasonic waves and super-hydrophobic materials, and a control method of the frostless refrigerator. The frostless refrigerator comprises a master controller, an evaporation chamber, a refrigerating chamber, a cold storage chamber, a compressor, a drainage device, an environmental temperature sensor and a magnetic sensitive control air valve, wherein the master controller is separately connected with a ultrasonic wave oscillation system, the compressor, an electric heater, the magnetic sensitive control air valve, a fan, the environmental temperature sensor, a refrigerating chamber temperature sensor, an evaporator temperature sensor and a cold storage chamber temperature sensor, and the ultrasonic wave oscillation system and the electric heater are defrosting devices; the surface of an evaporator, the surface of a refrigerating chamber air channel, the surface of a refrigerating chamber air-return vent, the surface of a cold storage chamber air channel, and the surface of a cold storage chamber air-return channel are made from super-hydrophobic materials. According to the frostless refrigerator and the control method thereof disclosed by the invention, frosting surfaces are treated by using the super-hydrophobic materials, ultrasonic waves and electric heating are coupled, on-line defrosting is performed in a manner that the frostless refrigerator does not stop, the stable running environment of the refrigerator is guaranteed, and the service life of the refrigerator is prolonged.

The invention relates to an assessment method for GNSS interoperability, and belongs to the field of satellite navigation systems. The assessment method includes the steps that the position of a GNSS satellite is calculated according to an orbital element, the geometric dilution of precision (GDOP) of the GNSS satellite is calculated, geometric positioning of precision (GNSSP) of a GNSS is calculated, the integrity output parameter horizontal protection level (HPL) is calculated, usability of GNSS performance assessment parameters and continuity of the GNSS performance assessment parameters are calculated, weighted GNSS performance assessment indexes are calculated, single-point assessment interoperability is selected, and global-point assessment interoperability is selected. Along with the increase of the number of systems, the value of GNSSP probability density distribution central point is smaller, and distribution is more centralized.

The invention provides an implementation structure of a fractional delay digital filter. By factorizing odd term and even term of independent variable z in the frequency response function of the fractional delay digital filter, a high-level fractional delay digital filter operation can be factorized into two low-level fractional delay digital filter operations and one complex multiplication operation, thus the variation range of the target fitting curve which takes the delay parameter as the independent variable can be narrowed, the curve fitting orders can be lowered, the number of taps of the filter can be decreased, and hardware resources required for realizing the fractional delay digital filter can be reduced on the premise of not reducing the delay precision.

Optical systems, device, and methods including signal varying devices, such as optical amplifiers, attenuators, and filters that have controllable gain, loss and transparent intensity profiles, and which can include and be responsive to one or more local and remote controllers.

The invention provides a display panel, a drive method of the display panel and a liquid crystal display device, relates to the technical field of liquid crystal displaying and aims to reduce power consumption of the display panel. The display panel comprises a source driver, a plurality of pixel units and a common voltage output driver; the pixel units are confined by a plurality of grid lines and a plurality of data lines; the common voltage output driver is used for, on an N-th frame, inputting negative common voltage to the first one of the pixel units, and, on an adjacent frame of the N-th frame, inputting positive common voltage to the first pixel unit; the source driver is used for inputting data voltage, greater than or equal to negative common voltage, to the first pixel unit when the common voltage output driver input the negative common voltage to the first pixel unit, and inputting data voltage, less than or equal to the positive common voltage, to the first pixel unit when the common voltage output driver inputs the positive common voltage to the first pixel unit.

The production process of extra low-viscosity refined cotton includes the following steps: (1) selecting material; (2) cooking; (3) washing pulp; (4) pretreatment for bleaching; (5) bleaching; and (6) rolling, dewatering and drying to obtain finished product. It uses cotton linters whose maturity is greater than or equal to 80%, appearance does not impurity or other fibre and fibre longth is 8-10mm as raw material, its cooking step adopts sectional cooking, and the bleaching step adopts sectional bleaching.

The present invention relates to Coix seed oil extracted from Semen Coicis, pharmaceutical preparations thereof, and the use thereof in the treatment of tumors and inflammation. Specifically, the Coix seed oil contains 8 triglyceride ingredients in the following mass percentages: trilinolein 4.87-6.99%, 1-olein-2,3-dilinolein 13.00-18.69%, 1-palmitin-2,3-dilinolein 5.25-7.54%, 1,3-diolein-2-linolein 13.23-19.02%, 1-palmitin-2-linolein-3-olein 10.26-14.75%, 1,3-dipalmitin-2-linolein 2.28-3.28%, triolein 14.44-20.76%, and 1-palmitin-2,3-diolein 8.06-11.58%.

The invention relates to a technological method for producing a composite probiotic two-layer microcapsule by virtue of a double-emulsification method-spray drying which is suitable for various activeprobiotic composite micro-ecological preparations, which belongs to the technical field of food microorganisms. The two-layer microcapsule prepared by adopting the double-emulsificaiton-spray dryingmethod is high in probiotic embedding efficiency, good variable bacteria stability, complete in surface and is in an approximate spherical shape; and moreover, the embedded component is released afterpassing by two interfaces, so that the burst release phenomenon can be overcome, the release time can be prolonged, and the controlled-release performance is good. The production device is simple, the operation is convenient, the labor protection is facilitated, the process period is short, the productivity is high, the finished product has good acid tolerance and cholate resisting capability, the source of raw materials is wide, the price is low, the industrialized continuous mass production can be realized, and a foundation can be laid for the industrialized production of the probiotic products.

The invention discloses a soft starting circuit for a voltage regulator, and the soft starting circuit comprises a first bias current source, a first capacitance, a switch device, a second bias current source, a first resistance and a first operational amplifier, wherein the second bias current source is arranged between an external power supply and a first terminator of the first resistance, the first terminator of the first resistance is used as an output end of the soft starting circuit, and a second terminator of the first resistance is respectively connected with a negative input end of the first operational amplifier and the output end of the first operational amplifier. The soft starting circuit not only can prevent inductance current surge and overshoot pulse of the output voltage in the starting process, but also can reduce the variation range of the system on-off frequency in the soft starting process and reduce the processing difficulty of the system electromagnetic interference, so that the output voltage is smoothly increased to a stable working value, and the stability problem in the starting process can be avoided.

An automatic elastic tension compensator for the contactor of electric collector is composed of left and right external suporting pads, left pull hook passing through left external supporting pad and fixed to right one, right pull hook passing through right external supporting pad and fixed to left one, at least two serial springs on said left and right pull hooks, and internal supporting pad between said springs. Its advantage is high tension-compensating precision.

The design and production of tunable dispersive compensator belongs to the fiber communications technological field. The hard core of this invention is a hit-the-toe sampling fiber raster with a twice time lag curve. The fiber raster adopts a linear chatter phasic templet production, and uses the chatter sampling period (CSP) to compensate the chatter grating period (CGP) from the templet to make the change bound of the raster sampling period narrow and then to make the producing process more simply and more steady. Otherwise in the design and producing process of the fiber raster, compensate the average refractive index change from the toe-hit by introducing the CSP. Therefore the production and toe-hit can be complete at a time in which just once exposal is needed. Finally fix the fiber raster on the exact mechanical tuning device, to extend the fiber raster under the control of microcomputer and then control the dispersive compensatory quantity.

The invention provides a speed loss and variable pitch mixed control method for a permanent magnetic direct drive wind generating set and belongs to the technical field of generator control. The speedloss and variable pitch mixed control method for the permanent magnetic direct drive wind generating set comprises the steps that the value of the current wind speed and the values of the real-time power, the rotating speed and the pitch angle of the permanent magnetic direct drive wind generating set are detected; according to the values of the current wind speed, the real-time power, the rotating speed and the pitch angle, an equivalent wind speed method is used for carrying out calculation to obtain the wind speed, namely the equivalent average wind speed received by the front face of thecenter of a hub; and according to the relation between the equivalent average wind speed and the rated wind speed of the permanent magnetic direct drive wind generating set, the power output of the permanent magnetic direct drive wind generating set is controlled. The specific control method comprises three situations that 1, when the current wind speed is smaller than the rated wind speed, maximum power tracing control is adopted; 2, when the current wind speed exceeds the rated wind speed, constant-rotating speed control is adopted; and 3, when the current wind speed exceeds the rated wind speed, constant-power control is adopted. By means of the method, the problem that according to a permanent magnetic direct drive wind generating set variable pitch system, pitch angles are frequentlychanged, and consequently the failure rate is high is solved, and power output is more stable.