44results about How to "Small degree of dispersion" patented technology

The invention, which belongs to the digital control technology and flight control field, relates to a triplex redundancy-based realization method for a fly-by-light fight control system. According to the invention, three-level voting/monitoring modules are arranged, wherein the three-level voting/monitoring modules includes monitors and voters; optical signals of the sensors are converted into electrical signals that then enter voting/monitoring modules at the input terminals of computers; after flight control law calculation, the processed signals pass through the voting/monitoring modules at output terminals of the computers and then enter servers; and when the electrical signals pass through the voting/monitoring modules, the monitors remove fault channels and the voters select output from residual signals. Beneficial effects of the realization method are as follows: monitoring and fault positioning can be carried out conveniently, faults can be shielded effectively, and a dispersion degree of an inputted signal can be reduced; besides, the realization method with strong flexibility and less hardware enables the computers to work synchronously.

The invention discloses a medical ultrasound image speckle removing method through quantum inspiration. The method comprises the steps that a medical ultrasound image containing speckle noise is input; logarithm transformation is carried out to convert the multiplicative noise image into the additive noise image; complex wavelet transformation is carried out to convert a grey value of the image into a wavelet coefficient; noise variance, and variance and smoothing parameters of a probability density function of an ideal image signal are estimated to obtain a noise statistic model and a statistic model of the ideal image signal; an adaptive adjustment threshold value is calculated according to the theory of quantum inspiration, and soft threshold processing is carried out on the wavelet coefficient to obtain a wavelet coefficient estimation value of the ideal image signal; the wavelet coefficient estimation value of the ideal image signal is used for wavelet reconstruction to obtain the image; exponential transformation is carried out on the image to compensate the logarithm transformation in the first step, and the image with speckles removed is obtained. The method can keep organization details in the image well on the basis of effectively removing the speckle noise of the medical ultrasound image, and play a good role in assisting in medical treatment.

The invention relates to a method for obtaining the reliability sensitivity of an anti-icing air bleeding system under a temperature fault. Input parameters of the system and the random uncertainty of the system parameters are processed through a system parameter probability model, a function expression between system output responses and the system parameters is fitted with a response surface method, and influences of the uncertainty of the system parameters on the system reliability are reduced; according to a subset simulation reliability analysis method, the accuracy requirement can be met with the small sampling time number, the dispersion degree is small, and the convergence speed is high; the influence degree of the system parameters on the overall reliability of the system is calculated and obtained with a reliability sensitivity analysis method, and the direction is provided for determining the optimal solution of system reliability optimization design.

The present belongs to the new energy power generation technical field and relates to a probability distribution-based wind farm cluster output power smoothing effect analysis method. The method includes the following steps that: the wind power data of a wind farm are acquired and are adopted as wind electricity output power sample data; normalization processing is performed on the sample data, so that processing-post new data can be obtained; wind farm cluster output power smoothing effect indexes are obtained through calculation according to the new data; and the result of a wind farm cluster output power smoothing effect is determined according to the probability distribution of the indexes. According to the probability distribution-based wind farm cluster output power smoothing effect analysis method of the present, the three smoothing effect indexes, namely, wind electricity output power weighted probability, maximum output power simultaneity rate and average absolute fluctuation coefficient, are provided from the perspective of probability distribution; and influence on the wind farm cluster output power smoothing effect caused by different space scales can be obtained through comparison and analysis.

The invention discloses a multi-stage thermal control logic switch based on near-field thermal radiation. The invention belongs to the field of thermal regulators. The invention aims to solve the technical problem that the existing logic thermal switch can only support the thermal Boolean operation of one signal. The multistage thermal control logic switch based on near-field thermal radiation iscomposed of a receiving end composite structure, a transmitting end composite structure and a spacer arranged between the receiving end composite structure and the transmitting end composite structure. A vacuum gap is formed between the receiving end composite structure and the transmitting end composite structure through the spacer. The receiving end composite structure and the transmitting end composite structure are completely the same and are symmetrically arranged relative to the spacer, and the receiving end composite structure sequentially comprises a receiving end substrate, a receiving end inner layer film and a receiving end outer layer film from top to bottom; and the transmitting end composite structure sequentially comprises a transmitting end outer layer film, a transmittingend inner layer film and a transmitting end substrate from top to bottom. By controlling near-field radiant heat exchange between devices, the possibility of carrying out on-off logic operation on a micro-scale is realized.

The invention provides a bounded wave intensity electromagnetic pulse simulation system. The system comprises a high-voltage pulse assembly and a waveguide type antenna connected with the high-voltagepulse assembly, wherein the tail end of the waveguide type antenna is connected with a load; the high-voltage pulse assembly comprises a direct-current high-voltage module, a charging resistor, an energy storage capacitor and an air switch which are connected in sequence, the capacitance value of the energy storage capacitor is adjustable, the air switch comprises a shell, and a first electrode and a second electrode with variable discharge gaps are arranged in the shell and filled with working gas with variable pressure intensity; the direct-current high-voltage module is used for outputtingdirect-current high voltage and compressing the direct-current high voltage into the energy storage capacitor through the charging resistor, the energy storage capacitor is used for triggering the air switch to be broken down to form corresponding voltage pulses, and the voltage pulses are transmitted to a load through the waveguide type antenna. Strong electromagnetic pulse amplitude, leading edge and pulse width output by the system are large in variation amplitude and small in dispersion degree, and the stability of the system is high.

A combined steel wire straightening apparatus comprises a drawing die box, a horizontal straightener, a conjoined straightener and a reel; and the drawing die box is arranged in front of the reel, and the side edge of the reel is provided with the horizontal straightener and the conjoined straightener. The horizontal straightener is a three-roll horizontal straightener, an angle between the horizontal straightener and the conjoined straightener is 60-90DEG C, and the horizontal straightener is arranged in a position having a distance of 200-500mm to the reel. A steel wire from the die box goes through the reel, and is straightened by the conjoined straightener, the straightened steel wire is wound to the reel and is re-straightened by the horizontal straightener, the re-straightened steel wire is recovered to the reel. The combined straightening apparatus can improve the stability and the qualified rate of products.

The invention discloses a metal pad forming method and a semiconductor structure. The method comprises the step that a first isolation layer TaN, a second isolation layer Ti and a third isolation layer TiN are formed on a substrate, wherein metal interconnection lines are covered with the first isolation layer TaN, the second isolation layer Ti and the third isolation layer TiN. The potential of one end and the potential of the other end of a metal pad of a whole wafer tend to be consistent and are even very small in difference, the degrees of dispersion is low when reliability is tested, and the yield can be improved easily. Moreover, because the isolation layers are added, gap fill becomes easier when the metal pad is formed, and the performance of devices can be improved easily.

The invention relates to a compression test method for a honeycomb SCR catalyst. According to the method, a pressure test machine is used for extruding a catalyst test block at a constant speed; a pressure sensor on the pressure test machine measures a pressure value of the catalyst test block; a pressure curve is drawn by taking the time as horizontal coordinates and the pressure value as vertical coordinates; the curve is composed of a continuous elastic deformation curve S1 and a brittle deformation curve S2; pressure application is stopped after a peak value appears on the brittle deformation curve S2 in the pressure curve; and then a tangent line L1 and a tangent line L2 of the curves S1 and S2 are drawn, the tangent line L1 and the tangent line L2 are intersected, an intersection point is a threshold point of the catalyst test block, and the threshold point of the catalyst test block is defined as a compressive strength value of the catalyst.

The invention provides a multi-constraint-condition-oriented complex mobile crowdsourcing task decomposition method, which comprises the following steps: after a mobile crowdsourcing platform issues atask demand, performing task theoretical analysis on a task, and analyzing the reseparability of the task from top to bottom; decomposing the task into a hierarchical structure tree based on a complex crowdsourcing task execution process and structure; and using the leaf nodes in the hierarchical structure tree and the corresponding relationship of the leaf nodes in the hierarchical structure tree for expressing task decomposition based on a DAG mapper. According to the method, various influence factors of complex task decomposition are more comprehensively considered; the method comprises the steps of firstly performing theoretical analysis in task decomposition, and then rationalizing task decomposition and visualizing a decomposition result, so as to realize rationality, feasibility, scientificity and interpretability of task decomposition, and realize most rationalized task decomposition and quantification of a dependency relationship between sub-tasks.

The invention relates to an atomizing sprayer and particularly relates to a pneumatic atomizing sprayer. The pneumatic atomizing sprayer comprises a sprayer main body and an air knife unit, wherein aliquid outlet pipeline used for spraying liquid drops is arranged on the sprayer main body; the air knife unit comprises an end cover which is mounted on the sprayer main body and an air knife assembly, an air chamber is formed between the sprayer main body and the end cover, and the air knife assembly is used for spraying gas to the end part of the liquid outlet pipeline so as to cut the sprayedliquid drops; and a nozzle used for guiding the spraying of the liquid drops and the gas is arranged at a position corresponding to the liquid outlet pipeline on the end cover. The pneumatic atomizingsprayer which does not need high working pressure can provide mists with stable particle sizes, and the system cost is low.

The invention relates to a multifilament tensile test sample preparation apparatus, an accessory mainly comprises a reinforcing part and a heating part, and the reinforcing part comprises a melt adhesive cavity, a cavity top cover and a reinforcing support, and the heating part comprises an electrical heating layer and a temperature controller outside an integral support. The sample preparation apparatus can overcome the partial disadvantage of intensity measurement by fiber bundle, problems of easy pinch-off if fiber while testing and difficult control of clamping force can be solved, difficulty of easy bending of the fiber bundle when the fiber bundle is clamped can be simultaneously solved, discrete degree of the test result is reduced, experiment credibility and experiment data accuracy can be increased, a filament stretching experiment can be carried out through the experiment equipment, result accuracy is increased, the hot melt adhesive can be used in the cavity, cycle usage of the accessory is realized, and cost is saved.

The invention discloses a preparation method of a UV resistant nonwoven cloth for a surgery hole drape. The preparation method comprises following steps: step one, mixing TiO2:(Al, Ce) powder, N,N-dimethyl acetamide, and zirconium beads, and grinding the mixture to prepare TiO2:(Al, Ce) dispersion liquid; step two, mixing polyamide and N,N-dimethyl acetamide, stirring, adding the TiO2:(Al, Ce) dispersion liquid, maintaining the temperature, and keeping on stirring to obtain a spinning solution; and step three, using the spinning solution to carry out electrostatic spinning to obtain TiO2:(Al,Ce)/polyamide nonwoven cloth, namely the UV resistant nonwoven cloth for a surgery hole drape. The prepared nonwoven cloth has a very good antibacterial and UV resistant performance.

The invention discloses a modification method of a porous membrane, a modified porous membrane and an application of the modified porous membrane. The modification method comprises the following steps: S1, placing a porous membrane in a pre-polymerization solution containing a monomer, and initiating a polymerization reaction through free radicals to pre-polymerize the monomer in the pre-polymerization solution on the porous membrane; and S2, removing the pre-polymerized solution, and continuing free radical-initiated polymerization reaction. According to the two-step method, firstly, the porous membrane is placed in the pre-polymerization solution to be directly prepolymerized, so that monomers in the porous membrane can be at least partially polymerized, and in the process, the provided surrounding environment of the prepolymerization liquid can enable the content of the prepolymerization liquid at different positions in porous channels of the porous membrane to be in a more full-load state; therefore, the local structure of the pore channel is more uniform; and then the porous membrane is separated from the prepolymerization solution, and the prepolymerization components in the porous membrane are further polymerized, so that the dispersion degree of the adjusted pore sizes at different positions in the porous membrane is effectively ensured to be reduced to the minimum.

The invention discloses a method for determining a cavitation bubble separation point of a runner blade through an external characteristic index. According to the characteristics that an energy fluctuation signal at a tail water taper pipe of a hydraulic mechanical model is basically not changed along with the change of a cavitation coefficient before cavitation bubble separation of a hydraulic mechanical runner blade occurs, and the energy fluctuation signal at the tail water taper pipe of the hydraulic mechanical model is suddenly increased along with the reduction of the cavitation coefficient after the cavitation bubble separation occurs, mathematical statistical analysis on the energy fluctuation signal is carried out at the tail water taper pipe of the hydraulic mechanical model, the dispersion change of the energy fluctuation signal sequence at the tail water taper pipe of the hydraulic mechanical model under different cavitation coefficients is evaluated by a method for calculating the random uncertainty of the energy fluctuation signal at the tail water taper pipe of the hydraulic mechanical model, and the monotonicity change of the energy fluctuation at the tail water taper pipe of the hydraulic mechanical model is added, the corresponding criterion provided by the invention can be used for judging whether the cavitation bubble separation phenomenon of the hydraulic mechanical runner blade occurs or not, so that a basis is provided for predicting the service life of the runner blade.

The invention belongs to the technical field of road engineering, and discloses a temperature correlation characterization method for fatigue characteristics of an asphalt mixture. A mix proportion isdesigned for the asphalt mixture, an asphalt-aggregate ratio is determined, and a low frequency fatigue test under a different temperature is developed for the asphalt mixture under the asphalt-aggregate ratio; and a different fatigue life corresponding to the asphalt mixture under a different temperature in a simple stress state is obtained through origin fitting software, and the traditional fatigue life equation is then modified. The applicability of different fatigue test methods is analyzed from multiple angles, and a minitype beam four-point bending fatigue test is finally adopted for low-temperature and low-frequency fatigue performance. The fatigue life of the asphalt mixture is greatly influenced by a load control mode, and based on whether a load condition changes, the load is divided to simple load and composite load.

The invention discloses a path optimization method for a metal droplet multilayer deposition process, which reduces the problem of non-uniform thermal stress distribution caused by discrete solidification time distribution and avoids deformation or failure of a sample piece after production. The method comprises the following steps: firstly, establishing a numerical model of a metal droplet multilayer spreading process by adopting a life-death unit method and a lattice Boltzmann equation; and simulating the phase change process of the metal unit in the sample piece according to the geometric structure of the sample piece and the thermophysical parameters of the material, and carrying out post-processing on the data to obtain the solidification time of each unit, and calculating the solidification time standard deviation under the deposition path scheme, and adjusting the original deposition path according to the geometric structure of the sample piece and the obtained solidification time distribution condition, repeating simulation and post-processing steps, and comparing the obtained solidification time standard deviation with the original scheme, and repeatedly adjusting the deposition path scheme to obtain an optimized path scheme according to actual production requirements.

The invention belongs to the technical field of surface strengthening, and particularly relates to a blade composite surface strengthening method. The method comprises the steps of first-time vibration finishing, blade body liquid shot blasting, blade cleaning, tenon dry shot blasting, blade body dry shot blasting, second-time vibration finishing and the like. The problems that in the prior art, after surface strengthening, the surface roughness is not good enough, the blade surface residual stress dispersion degree is large, and the fatigue life of the blade is not good enough are solved. After the method is adopted for strengthening, the dispersion degree of residual stress on the surface of the blade is smaller, the residual stress layer depth is larger, the surface residual compressive stress and roughness are better, the fatigue life of the blade is longer, combination of multiple blade surface strengthening means is achieved, the quality stability of the blade is better improved, and the service life of the blade is prolonged. And the service life of the blades and the whole unit can be prolonged.

The invention relates to the technical field of network monitoring, and discloses a multi-stage variable-frequency network monitoring data acquisition method. The method comprises the following steps that S1, a timed scheduling module loads acquisition task information from a database to generate timed scheduling tasks with high, medium and low frequencies for each acquisition task, and generates different frequencies to facilitate scheduling. The invention further provides a multi-stage variable-frequency network monitoring data acquisition device, and the device comprises a system module assembly; the system module assembly comprises a timing scheduling module, a parallel data acquisition module, a parallel data processing module, a frequency conversion boundary calculation module and a frequency conversion control module. According to the method, the data acquisition frequency is temporarily improved when the dispersion degree of data acquired by equipment is increased or an alarm is given, and the self-adaptive capability of the acquisition frequency is reduced after a fault is eliminated or the dispersion degree of the data is reduced, so that the data acquisition efficiency, the resource utilization efficiency and the overall monitoring sensitivity of the system are effectively improved.