54results about How to "Raise the average" patented technology

The invention relates to a denitration ammonia spraying control method based on multi-variable correction, belongs to the technical field of ammonia spraying control of a denitration system of a thermal power generating set, and solves the problem that NOx fluctuation in an outlet of an SCR system in the prior art is severe. The method comprises the steps of acquiring measurement data and workingcondition information of a denitration system instrument in real time; constructing a NOx content prediction model at the inlet of the SCR denitration system, and predicting the NOx content at the inlet of the SCR system at the current moment; and carrying out ammonia spraying amount feedforward control and prediction correction on the basis of the predicted NOx content at the inlet of the SCR system and the measured data, generating an ammonia spraying amount control instruction at the current moment, controlling an ammonia spraying adjusting valve and adjusting the ammonia spraying amount. According to the method, the NOx content precision prediction model of the SCR inlet denitration system and the intelligent feedforward control method are adopted, so that NOx fluctuation at the outletof the SCR denitration system and space deviation are greatly reduced under the premise that smoke NOx emission satisfies the environmental protection index, the average value of the outlet NOx is increased, the ammonia spraying amount is reduced, the ammonia escape level is reduced, and the denitration cost is lowered.

The invention relates to a method for utilizing terahertz band infrared spectrum technology to detect the content of pesticides in foodstuffs. Foodstuff samples to be tested are grinded and pressed to obtain to-be-tested foodstuff sample sheets; the to-be-tested foodstuff sample sheets are tested by directly adopting a terahertz frequency band FTIR system, and a terahertz regional spectrum is obtained and used as a sample spectrum; under the same condition, the terahertz regional spectrum in a vacuum state is used as a reference spectrum, further an absorption coefficient spectrum of the foodstuff sample sheets to be tested is obtained, and the characteristic wave band of a target pesticide is acquired; finally, the absorption coefficient spectrum of the to-be-tested foodstuff sheets is divided into a calibration set sample absorption spectrum and a verification set sample absorption spectrum, a quantitative analysis model is constructed by using a support vector machine (SVM) regression method, and the quantitative detection values of various to-be-tested foodstuff samples are obtained. The method can really and effectively perform quick and accurate quantitative detection of residual pesticide in the foodstuffs, and the average value of the prediction correlation coefficient (Rv) of the quantitative analysis mode is up to 0.9796.

A method for a multi-mode terminal to select target networks with guaranteed quality of service on the basis of ant colony optimization is used for selecting optimized target networks for each multi-mode terminal by specifics that a base station acquires value of quality of service of each multi-mode terminal in each target network according to feedback of the multi-mode terminal and then simulates the ant colony optimization for searching advancing paths during foraging of ants, and includes steps of firstly, sequencing and numbering steps of ant advancing paths and selectable paths with natural numbers respectively and setting the total number of iterative algorithm; secondly, simulating the multi-mode terminals to select the target networks according to value of quality of service of different networks by the method selecting paths on the basis of different pheromone concentration and visibility in the ant advancing paths; calculating fitness of each path in the iterative algorithm after each section of advancing paths, updating the pheromone concentration of the paths according to the fitness, judging whether reaching the set times of the iterative algorithm or not so as to stop the ant colony iterative algorithm to output the optimal target networks selected by different multi-mode terminals.

The invention provides an offshore large direct-drive switch reluctance wind driven generator power converter and a system of the converter. The converter is composed of a switch reluctance wind turbine, a power converter body, a DC / DC converter body and a system controller. The switch reluctance wind turbine is connected with the power converter body. The power converter body is connected with the DC / DC converter body. Output of the DC / DC converter body is connected with output of a DC / DC converter body of the other switch reluctance wind driven generator power converter system in series or parallel and then outputs electric energy to the shore through a direct-current submarine cable. The system controller is connected with the power converter body and connected with the DC / DC converter body. The switch reluctance wind turbine is connected with the system controller. According to the system, two-phase windings of a four-phase switch reluctance generator can work at the same time, exciting voltage is adjustable, the function of outputting direct-current voltage and adjusting boost can be achieved, the power density and the controllable flexibility are improved, and the power converter is suitable for the field of offshore large wind power plants.

The invention discloses a low-power four-phase switched reluctance generator power converter. A main circuit of the converter consists of a separately excited asymmetric half-bridge four-phase winding power converter main circuit and a Zeta chopper circuit which are in end-to-end connection in parallel; a generation output side of the separately excited asymmetric half-bridge four-phase winding power converter main circuit is in parallel connection with an input side of the Zeta chopper circuit; and an output side of the Zeta chopper circuit is in parallel connection with an excitation input side of the separately excited asymmetric half-bridge four-phase winding power converter main circuit. The converter has a simple structure, two windings can work at the same time, so that power density is increased, the voltage and current pulsation is reduced, the wide adjustable range of the exciting voltage is beneficial to the control of the maximum power output, and the converter can be used in the fields of small-scale wind power generation and direct current power supply.

The invention discloses a multiple symmetrical winding magnetic flux switching motor and a winding design method thereof. The method is based on exertion of complementarity of windings of the magnetic flux switching motor with maximization of induced electric potential of each phase as the principle, and coil compositions of a phase winding, coil compositions of a set of symmetrical windings and coil connection types of all phase windings are obtained in sequence through optimizing the phase difference between two sets of adjacent symmetrical windings. The winding design method is clear in thinking and easy to operate. The multiple symmetrical winding magnetic flux switching motor has the advantages of being high in no-load induced electric potential sine degree and winding utilization rate, large in torque output and small in electromagnetic torque pulsation, and superior motor performance is embodied.

This invention relates to an active and passive single-phase power factor correction circuit composed of a reactor circuit, a magnetic energy resuming switch, a triple resonance circuit and a commutation filter circuit, in which, the reactor circuit carries out sensitive filter to circuit current, the magnetic energy resuming switch carries out capacitive compensation to the circuit current, the triple harmonic magnetic field generated by the secondary of the triple resonance circuit cancels out the primary triple harmonic current, and an AC voltage approximate to square waves and a circuit current approaching to synchronous and sine waveform are generated under the common action of the above three parts of circuits to be rectified and filtered by the commutation and filter circuit to get the DC output voltage with high mean value and low ripple voltage again.

The invention discloses a resonance circuit, which comprises a switch unit, a resonant unit, a transformer and a secondary rectifier unit, wherein the resonant unit comprises a resonant capacitor and a resonant inductor; the resonance circuit further comprises a current acquisition unit, a signal processing unit, a drive control unit, a first clamping unit and a second clamping unit; a first end and a first reference voltage end of the first clamping unit are connected; a first end and a second reference voltage end of the second clamping unit are connected; a second end of the first clamping unit and a second end of the second clamping unit are both connected to a public end of the resonant capacitor and a primary winding of the transformer; an input end of the current acquisition unit is connected to the resonant inductor; an output end of the current acquisition unit is connected to an input end of the signal processing unit; and an output end of the signal processing unit is connected to an input end of the drive control unit. When the cost of the resonance circuit is smaller, the working frequency of the resonance circuit is increased along with the increase of the output power, so that the working frequency of the resonance circuit is further improved.

The invention provides a video de-interlacing method. The video de-interlacing method comprises the following steps: a regional division step: dividing a video image into a motion area and a stationary area by utilizing a five-motion detector; a stationary area interpolation step: combining two adjacent fields into one frame in the stationary area, and performing interpolation by adopting a time interpolation method; and a motion area interpolation step: performing interpolation in the motion area by adopting an enhanced edge line average method. According to the video de-interlacing method disclosed by the invention, edge-based line averaging is improved through precise motion detection; and thus, the de-interlacing effect is improved.

The invention discloses a flow field optimization system for a denitration and ammonia injection device in a coal-fired power plant. The flow field optimization system comprises a boiler tail flue andan economizer outlet guide plate, wherein the economizer outlet guide plate comprises a plurality of economizer outlet guide plate units; the economizer outlet guide plate units are arranged at intervals in the boiler tail flue. According to the arrangement of the economizer outlet guide plate and the flue reducing guide plate, the flue gas can be subjected to effective flow field optimization inside the boiler tail flue, so that the flue gas circulation stability is improved, and the flue gas turbulence problem in the traditional technology is solved. Because the flue gas flow field is stable, the mean velocity of flue gas entering the reactor is relatively consistent, and the relative standard deviation of speed distribution is small. The ammonia injection grid comprises a plurality ofammonia injection grid units, and each ammonia injection grid unit is independently controlled for ammonia injection, so that the average value of the molar ratio of NH3 to NOx can be improved. Because the ammonia injection accuracy is improved, the problem in the traditional technology that the reducing agent is wasted can be solved, and the problem of ammonia pollution can be avoided.

The invention discloses a building coating production waste treatment system and method in the field of building coating production waste treatment. The system comprises a counterweight base, a production mixing assembly, a recovery and storage assembly and a sampling detection assembly, wherein the production mixing assembly comprises a mixing barrel, a feeding pipe, a backflow connecting pipe, L-shaped supporting legs, a stirring mechanism, a power mechanism, a water injection mechanism and a supporting mechanism; and the recovery and storage assembly comprises a finished product storage barrel, a waste treatment barrel, a conveying mechanism and a backflow mechanism. A water-based paint detector is used for detecting paint samples at different heights, which is helpful to judge whetherthe mixed paint is qualified; the cleaning mechanism is used for continuously cleaning the inner wall of the mixing barrel and also can be used for carrying out jet cleaning on a cleaning scraping plate, so that raw materials are prevented from staining the inner wall of the mixing barrel and the side wall of the cleaning scraping plate to a certain extent, and the effect of stirring work is improved in a turning manner.

The invention discloses a three-dimensional curved wall mixed phase regular quadrilateral chiral honeycomb, and belongs to the technical field of safety protection. The chiral honeycomb is composed of a straight-wall honeycomb framework and curved surfaces, wherein the straight-wall honeycomb framework is composed of honeycomb cell elements, and the curved surfaces abut against the adjacent curved surfaces when being impacted; and the curved surfaces are spliced on the honeycomb cell elements to form the three-dimensional curved wall mixed phase chiral honeycomb. Compared with the prior art, the three-dimensional curved wall mixed phase chiral honeycomb has the beneficial effects that the adjacent curved surfaces of the three-dimensional curved-wall mixed-phase chiral honeycomb abut against each other to dissipate energy, a novel energy absorption mechanism is formed, an advantage that a force-displacement curve of a traditional straight wall honeycomb structure is stable is kept, and the total energy absorption amount and specific energy absorption are greatly improved on the premise of not wasting extra space. In addition, axial rigidity of the curved surfaces with wide upper parts and narrow lower parts is also greatly improved, and an average value of force-displacement curves can be greatly improved.

The invention relates to an electrostrictive effect based fiber bragg grating magnetic field sensor and an application method thereof, and belongs to the technical field of optoelectronic measurement. The electrostrictive effect based fiber bragg grating magnetic field sensor comprises a DC asynchronous motor, a motor rotating shaft, a commutator, a brush, a rectangular coil, a bridge rectifier diode, a filtering capacitor, a protective resistor, a fiber bragg grating, piezoelectric ceramic, bonding points and an external extraction optical fiber, wherein the DC asynchronous motor, the motor rotating shaft, the commutator and the rectangular coil are fixed together, the brush is contacted with the commutator, a contact of the brush is connected with the bridge rectifier diode through a wire, a leading-out end of the bridge rectifier diode is connected with the filtering capacitor and the protective resistor, the fiber bragg grating is bonded to the piezoelectric ceramic through the two bonding points and connected with the external extraction optical fiber. The electrostrictive effect based fiber bragg grating magnetic field sensor improves the deformation quantity of the piezoelectric ceramic, expands the measurement range of a magnetic field, and is high in anti-interference capacity, simple in structure and convenient to use.

The invention discloses a device for measuring an axial angle of an implant in a dental implant operation. A first rod comprises a firsthead rod and first tail rod which are connected with each other,a second rod comprises a second head rod and second tail rod which are connected with each other, a third rod comprises a thirdhead rod third tail rod which are connected with each other, and a fourth rod comprises a fourth head rod and fourthtail rod which are connected with each other, the first tail rod of the first rod is connected with third tail rod of the third rod,the first rod is at an angle alpha with the third rod, the second tail rod of the second rod is connected with the fourth tail rod of the fourth rod, the second rod is at an angle alpha with the fourth rod, the third rod ishinged with the fourth rod through a joint, the joint is slidably arranged along the tail end of third tail rod and the fourth tail rod, the first rod (second rod) is linked with the third rod (fourthrod), the axial lengths of the first rod and second rod are both smaller than the axial lengths of the third rod and fourth rod. The analysis and measurement device can be used for checking the axialangle of a cavity when an implant operation is carried out, measuring the angle of a mouth when implanting and repairing are carried out and measuring the angle of a model when the implanting and repairing are carried out. The operation is simple, fast, and low in cost and the measurement results are accurate and reliable.

A thick steel sheet according to the present invention has a specified chemical composition and contains oxides, wherein constituent elements for the oxides excluding oxygen fulfil the formulae: 2% < Ti < 40%, 5% < Al < 30%, 5% < Ca < 40%, 5% < REM < 50%, 2% < Zr < 30% and 1.0 ≤ REM / Zr in mass%, and wherein, among the particles of the oxides, the number of particles each having an equivalent circle diameter of less than 2 μm is 300 particles / mm2 or more and the number of particles each having an equivalent circle diameter of 2 μm or more is 100 particles / mm2 or less, and wherein, among particles of a Ti nitride, the number of particles each having an equivalent circle diameter of 1 μm or more is 7 particles / mm2 or less and the number of particles each having an equivalent circle diameter of 20 nm or more is 1.0 × 106 particles / mm2 or more, and wherein the relational formula: |da-df| / da ≤ 0.35 is fulfilled.

The invention discloses a high-yield, stable-yield and rice-blast-resistant breeding method of rice. The characteristic that distances between six vertexes and center of a regular hexagon are uniform is utilized, and a regular hexagon planting method is adopted to plant and breed experimental populations different in generation, so that single-plant selecting field experimental errors are reduced; a single plant of a highly-competitive strain at the center of the regular hexagon uniformly generates environmental resource stress, so that genotypes low in resource utilization rate are inhibited greatly, and selection of single plants high in resource utilization rate is facilitated. The highly-competitive strain has the advantage of high sensitivity to neck blast, so that prevailing and infection of physiological races of rice blast are facilitated, and inspection of an anti-infection mechanism of F2 separation single plants is increased. The breeding method organically combines stable yield, high yield and resistance and is high in suitable range, and rice varieties bred by the method have the advantages of high and stable yield and good comprehensive agronomic character and are suitable for various planting modes.

The invention discloses a parameter determining method and a parameter determining device in link self-adaptive technology. A problem of large error of acquired SINR caused by conventional LTE system link self-adaptive technology used in PDMA technology is solved. The parameter determining method comprises steps that network equipment is used to acquire a first SINR of user equipment, and the first SINR is the SINR acquired based on reference signal measurement; the channel capacity of the user equipment is determined according to the first SINR of the user equipment; a second SINR after the matching of the user equipment is determined according to the channel capacity of the user equipment. According to the channel capacity of the user equipment, the second SINR after the matching of the user equipment is determined, and then an MCS level corresponding to the user equipment after the matching is further determined, and therefore scheduling efficiency and transmission efficiency are improved, retransmission is prevented, detected BLER is kept at a low level, and therefore cell average and edge user frequency spectrum efficiency is improved, and cell access user number is increased.

The invention discloses a header-system connecting system for improving the efficiency of a deep peak regulation low-pressure cylinder and an operation method. The header-system connecting system comprises steam-water systems of steam turbine units and an additional system. The additional system communicates main steam, reheat cold section and hot section steam, low-pressure cylinder extracted steam and final supplied water to corresponding headers. When boilers in parts of units are shut down, are in hot standby or run in daily start-stop, steam turbines of the units in which the boilers are shut down can obtain main steam and reheat steam by controlling a connecting valve bank between each header and the corresponding unit, cold reheat steam of the units in which the boilers are shut down is recycled, and the effect that the units do not stop while the boilers are shut down is achieved. In addition, condensate pumps and water supply pumps of the units in which the boilers are shut down do not work, and more energy is saved. By the method, under the operation condition of less boilers and more units, further decoupling of the units and the boilers can be realized, and under the normal operation condition of the boilers put into operation, the output electric power rate of steam turbine generator units under the deep peak regulation operation condition is further reduced.

The invention discloses a Venturi type mixer. The Venturi type mixer comprises a shrinking section, a throat pipe and an expansion section, wherein the throat pipe comprises an outer tube and an innertube which are arranged coaxially; two annular plates are separately arranged at two ends of a cavity formed by the outer tube and the inner tube in a surrounding manner; at least one inlet tube is arranged on the outer tube; a flow guiding device is arranged in the inner tube and comprises a mandrel; N fins are arranged on the outer wall of the mandrel in a peripheral direction at equal angles;N lines of through holes are formed in the wall of the inner tube in a peripheral direction at equal angles; every line of through holes point to a space between the two adjacent corresponding fins; and N is an integer greater than or equal to 3. By the provided Venturi type mixer, first fluid is averagely distributed into N parts after reaching the inner tube; and second fluid enters the inner tube through the through hole of the inner tube and is correspondingly divided into N lines, and the two fluids can be uniformly mixed immediately after being gathered in the inner tube.

The invention relates to the technical field of temperature control of a heating furnace, and provides a flow matching optimization control device and method for a main pipe and branch pipes of a gasheating furnace. The device and method carry out parameter setting through a parameter setting module, realize information acquisition of the heating furnace through an information acquisition module,calculate the actual opening degrees of a main valve and each branch valve through a different control period-matched double closed loop control module of the temperatures of the main valve and the branch valves, and set corresponding dynamic limiting degree value through a main valve and branch valve opening degree dynamic limiting degree setting module to obtain the final control amount of themain valve and the final control amount of each branch valve of a different control period-matched double closed loop control outer loop; a pressure stabilizing control module after the main valve obtains the next inner loop control period compensation control signal amount of the opening degree of the main valve; and the final control amount of the main valve, the final control amount of each branch valve and the next inner loop control period compensation control signal amount of the opening degree of the main valve are distributed to the valves according to the corresponding periods througha control amount distribution module, so that the period control is carried out.

The invention discloses an automobile generator system. The automobile generator system comprises a generator, a battery, a rectifier circuit, a filter circuit and a regulator for controlling an excitation current in the generator; the generator comprises a stator coil fixed on an engine, and a rotor coil connected to an engine crankshaft; an input end of the rectifier circuit is connected to thestator coil, and an output end of the rectifier circuit is connected to two poles of the battery; the filter circuit and the rectifier circuit are connected in parallel; one end of the rotor coil is connected to an F end of the regulator, and at the other end of the rotor coil is connected to a cathode of the battery. The invention also discloses a starting method of an automobile generator system. The invention can effectively prevent the generator from consuming the starting torque of the starter when the engine is started, and can improve the stability of the output voltage of the generator.

This invention relates to a single phase power factor correction circuit of serial compensation boosting composed of a reactor circuit, a magnetic energy resuming switch and a commutation and filter circuit, in which, the reactor circuit filters its current to get lag and almost sine wave input current, the magnetic energy resuming switch is composed of four power switches, two power diodes, electrolysis capacitors and a driver, the almost sine wave current synchronized to the supply voltage is got by executing capacitive compensation to the circuit current and making up the voltage drop induced by the reactor, the commutation and filter circuit commutates and filters the almost square wave alternative voltage to get a high mean value and DC output voltage of low ripple voltage.

The invention belongs to the technical field of sealing structures and particularly relates to a non-rotating sealing lip rotary sealing structure. The non-rotating sealing lip rotary sealing structure comprises two adjacent parts; a sealing ring is disposed between the contact surfaces of the two parts; at least one part rotates oppositely to the other part around the rotation axis of the formerpart; and the contour shape of the sealing ring is non-rotating relative to the rotating axes of the two parts. The sealing structure is long in service life, higher in running speed, higher in allowed average pressure intensity and allowed peak value pressure intensity and lower in resisting moment and heating amount.

The invention provides a diaphragm spraying production line. The diaphragm spraying production line comprises an unwinding mechanism, a coating mechanism, a drying oven and a winding mechanism; the coating mechanism comprises a roller coating mechanism and a spraying mechanism which are used for coating the same side of a diaphragm with slurry, the unwinding mechanism and the winding mechanism arearranged on the same side of the drying oven, the roller coating mechanism and the spraying mechanism are arranged on the two sides of the drying oven correspondingly, and the roller coating mechanism is arranged between the unwinding mechanism and the drying oven; the spraying mechanism comprises a spraying device and spraying guide rollers used for unfolding the diaphragm, the spraying guide rollers comprise the upper guide roller and the lower guide roller, and a material receiving groove used for recycling vaporous slurry is formed below the spraying device; and the diaphragm is unwound from the unwinding mechanism and sequentially passes through the roller coating mechanism, the drying oven, the side, facing the spraying device, of the upper guide roller, the side, facing the spraying device, of the lower guide roller and the drying oven to reach the winding mechanism. According to the diaphragm spraying production line, the vaporific slurry can be prevented from condensing and dropping onto the surface of the diaphragm, the vaporific slurry can be recycled, and the same surface of the diaphragm can be coated without additionally arranging an overturning frame.

The invention relates to the field of planting, in particular to a rejuvenation culture method for aged and endangered ancient tea trees. The rejuvenation culture method for the aged and endangered ancient tea trees comprises the following steps: the rejuvenated ancient tea trees are prepared and can bear tea seeds, tea seeds of related tea tree varieties are selected, the tea seeds are cultivated in a container, the to-be-rejuvenated ancient tea trees are classified into a bud mutation variety and a whole variant variety, classification treatment is conducted, firstly, the ancient tea trees belong to the bud mutation variety, only part of the tea tree branches are subjected to bud mutation, the bud mutation branches are marked, and then non-bud mutation branches are classified and marked; the ancient tea trees belong to the whole variant variety, and all branches are classified and marked according to vulnerable branches, moderately strong branches and strong branches; and therefore, the aged and endangered tea trees can improve the nutrition supply while the tree vigor capacity is gradually recovered, and the overall vitality of the trees can be increased on the premise that the tree vigor capacity is enhanced.