150results about How to "Reduce accidental error" patented technology

The invention relates to the field of traffic rails and specifically relates to a method and a system for testing dynamic stiffness. The method for testing the dynamic stiffness includes that a force in a preset frequency range is applied to a rail in preset time to enable the rail to produce vibration; force signals and vibratory acceleration signals are real-timely acquired according to a preset sampling frequency; data of the force F, time corresponding to the force F, data of an acceleration a and time corresponding to the acceleration a are recorded according to preset time intervals, the acquired force signals and the acquired acceleration signals; a corresponding relation of a displacement X and the frequency f is obtained according to the corresponding relation of the data of the acceleration a and the time corresponding to the acceleration a; the corresponding relation of the displacement X and the time t is obtained; and the corresponding relation of the dynamic stiffness Z and the frequency f is obtained according to the corresponding relations and the corresponding relation of the dynamic stiffness, the displacement and the force, and namely, wide frequency dynamic stiffness is obtained. By means of the method and the system for testing the dynamic stiffness, the wide frequency dynamic stiffness of the rail can be tested.

The invention provides a test device and method for simulating natural gas leakage in soil. The test device comprises a compressed gas steel cylinder, a pressure reducing valve, a gas flow meter, a PC computer, a pressure-tolerant hose, a rigid pipe, a gas buffer cylinder, a combustible gas probe, a multichannel combustible gas probe controller, a waterproof shield cable, a rigid hose and the like. The gas buffer cylinder and the combustible gas probe are embedded in outdoor soil. Through the rigid hose, zero calibration can be carried out on the combustible gas probe buried in the ground. The test method comprises the steps that the pressure reducing valve of the compressed gas steel cylinder of natural gas is opened; the gas buffer cylinder is filled with the natural gas successively through the gas flow meter, the pressure-tolerant hose and the rigid pipe; the combustible gas probe buried in the ground is used to collect the concentration of the gas leaking out from the gas buffer cylinder; the diffusion law of the natural gas in soil after natural gas pipe leakage is researched; and a technical support is provided for the prevention and the disposition of a natural gas pipe leakage accident.

The invention provides a laser targeted integral calibration method by aiming at large-size 6D laser target, which relates to the field of large-size space six-degree-of-freedom attitude measurement,and fully uses the advantages of high precision and programmable control of a precious triaxial rotary table. Artificial participation part is not contained during a process, the calibration reliability is increased, and the calibration efficiency is greatly increased. The integral calibration method uses an external frame and a middle frame of the precious triaxial rotary table to drive the 6D laser target to rotate at front of emitting light of a total station to construct a measured control field, the projection position of a light vector under a camera coordinate system is calculated, thereal projection position of the camera is obtained through detection, an attitude relation equation of a clinometer coordinate system and a rotary table coordinate system is established to obtain an attitude relation of the clinometer coordinate system and the camera coordinate system, and the unknown relation parameters in a 6D laser target resolving model can be calibrated. The method can be mainly used for six-degree-of-freedom attitude measurement.

The invention relates to an existing railway survey method based on a total station. In the method, the total station and an electromagnetic wave reflection device are adopted to survey an existing railway. The survey method comprises the following steps: firstly arranging the electromagnetic wave reflection device at the center of the existing railway line to be surveyed by virtue of a traditional measuring square ruler; determining position of the total station, and surveying the line center by the electromagnetic wave reflection device to obtain distance (slant distance), horizontal angle and vertical angle of the surveyed line and 3D coordinates of survey points (X, Y and H) of the measured line (slope distance); and then analyzing and calculating the survey data by a PDA, and performing survey on line mileage, center line, traverse, elevation and other railway equipment. The existing railway survey method based on a total station reduces on-track operation times of operators, guarantees safety of surveyors, instruments and equipment, accuracy and reliability of the surveyed data, improves production efficiency of the existing railways, and alleviates labor intensity of the operators.

The invention discloses a train wheel hub inner hole diameter laser measurement system and a measurement method thereof, and belongs to the technical field of measurement.The measurement system comprises a bottom frame, a worktable, limiting mechanisms, a high-precision laser distance measuring sensor assembly, a lifting mechanism, an oil cylinder head, an oil cylinder, connecting screws, a hydraulic station, a hydraulic valve station, a data acquisition card, a controller, a displayer, a relay, a cable power source, a signal communication module, a driving control module and a data acquisition and processing module.According to the train wheel hub inner hole diameter laser measurement system and the measurement method thereof, a laser ray is perpendicular to the surface of an inner hole when used for measuring the wheel inner hole, a laser device measures one piece of data at one part of the wheel inner hole every time rotating by 90 degrees to obtain four pieces of data, the diameter of the inner hole at the part is obtained through geometrical relationship calculation, and the distance between a laser emitting point and the rotating center of an indexing table is calibrated through the known diameter of the wheel inner hole.The train wheel hub inner hole diameter laser measurement system and the measurement method thereof have the advantages of being high in speed, precision and stability and the like, and can be applied to and popularized in detection of shapes of hole parts.

The invention relates to based on laser backscattering type atmospheric visibility measuring method and apparatus. It includes the following steps: respectively transmitting and receiving laser backscattering signal for five times as middle gain and high gain, sampling 400 points in each the received signal; respectively computing each fault extinction coefficient while sampling, computing its average extinction coefficient for five sets after removing the point with big error; computing whole relative extinction coefficient by data fusion algorithm; deducing the atmospheric visibility by relative extinction coefficient inversion. The invention has the advantages of high measuring precision, little volume, light weight, wide application range, and no collaboration object.

The invention relates to a verification device for the Newton second law. The verification device is characterized in that: a photoelectric door A (5) is taken as a switch for timing start of a digital millisecond meter A (1) and a digital millisecond meter B (2); the photoelectric door A (5), a photoelectric door B (6) and a photoelectric door C (7) are fixed on a steel plate (3) in sequence, and are taken as timing switches of the digital millisecond meter A (1) and the digital millisecond meter B (2) for recording the acceleration motion time of a trolley (4) on the steel plate (3) and computing the acceleration of the trolley (4); the position of a base plate (8) is changed, and the mass of the trolley (4) is kept constant, so that direct proportion between the acceleration and resultant force can be verified when the mass is constant; and meanwhile, the position of the base plate (8) and the mass of the trolley (4) are changed, and the resultant force is kept constant, so that inverse proportion between the acceleration and the mass can be verified when the resultant force is constant. The verification device can be applied to a verification experiment of the Newton second law in physics.

The invention discloses a method for measuring contents of ferrous ions and iron ions in glass, comprising the following steps: measuring the absorption spectrum of a provided glass sheet within the waveband range of 350-1100nm by using an ultraviolet and visible spectrophotometer; dividing the absorbency data in the absorption spectrum by the thickness of the glass sheet to obtain the absorbency of glass sheet with unit thickness, thereby further obtaining the spectrum curve of relationship between the wavelength in the absorption spectrum and the absorbency of the thickness of the glass sheet; carrying out smoothing treatment and basic line correction on the spectrum curve successively; and carrying out area integration on the spectrum curve after line correction respectively within the waveband range of 370-400nm and within the waveband range of 520-1100nm, and calculating the contents of iron ions and ferrous ions according to corresponding integrated areas. By using the method, the contents of iron ions and ferrous ions can be measured simultaneously, the operation is simple and fast, data processing is simple and convenient, and the reliability and the repeatability are good, therefore, the method can meet on-line monitoring requirement of glass and is applicable to industrial popularization.

A kind of two-way multifunctional laser vertical collimator is made of bracket, zenith telescope module and nadir external laser telescope module, sphere vertical axis module and the triangular base. It is characterized in that: the zenith telescope module and nadir external laser telescope module are set on the A and B plane of main bracket top respectively, which are installed at the bracket or vertical axis center by the socket bolt and the column head bolt respectively. A phi 108 base hole is set below the main bracket, while, the outer of main bracket is set with a V-shape axile bush which is fixed the main bracket on the vertical axis module by a hole adjusting bolt to form a combination shafting which can rotate with the vertical axis; otherwise, a long level tube is installed on the side of main bracket which is used to adjust level and plumb.

The invention discloses an intelligent programmable-control microcurrent measurement display system, which is characterized by comprising a computer control module, a display module, a communication module, an A/D (analog/digital) conversion module, a microcurrent measurement system programmable control module, a programmable-control current signal amplifying module and a programmable-control filter module. Microcurrent signals to be measured are input to the programmable-control current signal amplifying module, are amplified and then converted into voltage signals, the voltage signals are input to the programmable-control filter module so as to be filtered, the filtered signals are input to the display module through the A/D conversion module and the communication module so as to be displayed, the programmable-control current signal amplifying module, the programmable-control filter module and the A/D conversion module are controlled by the microcurrent measurement system programmable control module, and the computer control module controls the microcurrent measurement system programmable control module through the communication module. The intelligent programmable microcurrent measurement display system is low in manufacturing cost, higher in adaptability and lowered in price resistance to scientific research.

The invention discloses a hand/arm vein fusion identification method based on cumulative matching and an equal error rate curve, belonging to the field of information perception and recognition technology. The method proposes two levels of weights according to the recognition performance of the two biological features: firstly, the global weights of fractional fusion are calculated according to the area above the CMC curve by utilizing the characteristics of the CMC curve; then the optimal classification threshold is obtained by ERR curves, and the adaptive weights are calculated, which are multiplied as the total weights and fused with fractional weighting. This method is beneficial to highlighting the advantages of biometrics, and multi-biometrics fusion can make use of the independenceand complementarity of features, which can make up for the shortcomings of single-mode biometrics recognition.

The invention provides a method and a device for fast obtaining a course angle of a trackless vehicle in an underground roadway environment. The method comprises the steps that in a self coordinate system of the trackless vehicle, a plurality of corresponding distances between a coordinate origin and a plurality of points on the peripheral roadway wall in different angle directions are measured; the course angle of the trackless vehicle is calculated according to measurement results. The device comprises a distance detecting module and a course angle calculating module, wherein the distance detecting module is used for measuring the corresponding distances between the coordinate origin and the points on the peripheral roadway wall in different angle directions in the self coordinate system of the trackless vehicle, and the course angle calculating module is used for calculating the course angle of the trackless vehicle according to the measurement results. The method and the device can realize the self obtaining of the course angle of the trackless vehicle in the underground roadway environment, and are particularly applicable to unmanned autonomous running vehicles.

This invention discloses a lithium ion battery hydrofluoric content test method in the electrolyte, which uses alcoholate and alkali metals as standard solution and is characterized by the following: to choose certain electrolyte with HF to be measured to test its electrolyte potential; to join the above quantity of the known concentration to the electrolyte to be measured to test the electrolyte potential after the joining; to compute the density of the HF in the electrolyte according to the relative data.

The invention discloses a thermocouple arrangement method for measuring the axial temperature distribution of an intermediate joint of a high-voltage cable. In view of the axial difference of temperature distribution at different positions of a contact interface between a cable body and the intermediate joint, a fixed point thermocouple arrangement method for studying the axial temperature variation law is provided. From the selection and determination of specific thermocouple positions, the determination of the number of temperature measuring points, lead arrangement, the determination of hole depth, and the specific arrangement of the thermocouple, the method comprehensively measure the temperature distribution at positions of the intermediate joint of the cable, reduces the accidental error and the inherent error by repeating experiments to take an average, and lays an important experimental foundation for studying the relationship between the temperature distribution of the intermediate joint and the current carrying capacity and interface pressure.

Provided is an object identification method based on high-resolution one-dimensional image information fusion. The purpose of the invention is to solve how to perform information fusion on the observations of different radars in a network in order to increase resolution. The method comprises a step 1: detecting two aircrafts by using two kinds of radars with different waveforms generated by BSS so as to obtain echo data of the two different radars; a step 2 of performing pulse compression on the echo data to obtain two groups of high-resolution one-dimensional images of an object; a step 3 of performing data fusion on the two groups of high-resolution one-dimensional images by using a weighted average method to obtain a new group of one-dimensional images, wherein a fusion weight is randomly selected between 0 to 1; a step 4 of subjecting the two groups of high-resolution one-dimensional images to a set threshold to acquire the number of sampling points; a step 5 of multiplying the number of sampling points of the new high-resolution one-dimensional images by a preset distance resolution (actual distance between the two sampling points) to obtain the length of the object; and a step 6 of performing object identification by using Bayesian classification.

The invention discloses a culture medium to detect Bifidobacterium and a quick detection and counting method, and relates to the technical field of Bifidobacterium detection. The culture medium hereincomprises a basic medium, and rendering substrate 5-bromo-4-chloro-3-indol-alpha-D-galactoside and/or 5-bromo-4-chloro-3-indol-beta-D-galactoside; alpha-galactosidase generated by metabolism in the Bifidobacterium culture process reacts with the rendering substrate to release indole, so that a blue Bifidobacterium colony is present on the culture medium, or blue halo is present around the Bifidobacterium colony; interfering bacteria cannot display blue color without alpha-galactosidase; the rendering substrate can inhibit other interfering bacteria; the colony can grow quickly after a surfactant is added; the growth of other interfering bacteria can be inhibited by adding antibiotics to the culture medium herein. The culture medium, when used to detect and count Bifidobacterium, allows the Bifidobacterium colonies to be counted conveniently and quickly; the results are significant, detection cost is low, and accuracy is high.

The embodiment of the invention provides a wafer data detection method and system, a storage medium and a test parameter adjustment method. The wafer data detection method comprises the steps of obtaining to-be-detected first wafer test data and to-be-detected second wafer test data in a database, and partitioning the first wafer test data and the second wafer test data according to wafer position information of each chip in the first wafer test data and the second wafer test data, generating a plurality of first wafer partition test data and a plurality of second wafer partition test data; and detecting the correlation between the first wafer partition test data and the second wafer partition test data belonging to the same partition. According to the invention, the test area of the wafer is partitioned, and the correlation between the first wafer test data and the second wafer test data of the partition is detected, so that the correlation of the whole wafer test data is evaluated, and the accuracy of the correlation detection result of the wafer test data can be improved.

The invention relates to an indirect method for using a monoclonal antibody SPA red cell rosette to detect lymphocyte subsets. The method firstly prepares a primary antibody sensitized red blood cell preservation solution and a secondary antibody sensitized red blood cell preservation solution; secondly, the peripheral blood lymphocytes are separated, and then a secondary antibody sensitized red blood cell application solution and a primary antibody sensitized lymphocyte suspension are prepared by a calcium-free and magnesium-free Hanks balanced salt solution which contains 20 percent newborn calf serum; then the primary antibody sensitized lymphocyte suspension and the secondary antibody sensitized red blood cell application solution are mixed by the volume ratio of 1: 1 to form a mixed suspension; a centrifugation is carried out after the mixed suspension is statically settled under 18 - 28 DEG C, and then the mixed suspension is statically settled for 15 - 45 minutes at the temperature of 4 DEG C; finally, a pipette which is provided with a suction head is used for blowing and sucking the mixed suspension for 8 - 15 times, then cell smears are prepared and calculated by a high-power lens after natural drying and dyeing. Compared with the original McAb-A-E indirect method, the invention is characterized by simplified inspection process, short period, quantized control and satisfying the requirements of clinical inspection.

The invention discloses a method for detecting the content of gypsum particles in smoke of a desulphuration outlet. The method comprises the following steps: taking smoke from a measuring hole at the desulphuration outlet by using a smoke sampling gun with a built-in glass fiber filter membrane; taking down the glass fiber filter membrane in the smoke sampling gun, and acquiring the total crystal water content m<2> in a gypsum sample; acquiring the molar weight of total CaSO4 by a 'sulfur trioxide determining-barium sulphate gravimetric method' in section 11 in GB/T5485-2012 and a formula; acquiring the mass X1 of CaSO4.2H20 in the gypsum sample by a linear equation in two unknowns; calculating the content of the gypsum particles in the smoke; and verifying whether the data are qualified or not. The method has the advantage that the method for detecting the content of the gypsum particles in the smoke of the desulphuration outlet is simple, practical, rapid and accurate.

The invention provides a radio wave tunnel scenograph which comprises a radio wave receiver and a radio wave transmitter, wherein a plurality of receiving coils with antenna modules are arranged between the receiver and the transmitter; the antenna modules comprise singlechips, A/D (analog to digital) conversion modules and 2.4G radio communication modules; the A/D conversion modules and the 2.4G radio communication modules are connected with pins of the singlechips; the receiver comprises a singlechip, a data storage module and a 2.4G radio communication module; and the data storage module and the 2.4G radio communication module are connected with pins of the singlechip. According to the radio wave tunnel scenograph, the data collection quantity of an identical receiving point is increased greatly; the accidental error of single data is reduced; the interpretation accuracy is improved; the background interference can be eliminated effectively due to the fact that the data is measured before the transmitter transmits; the working strength of an operator of the receiver is reduced greatly; and the radio wave tunnel scenograph is high in interference resistance and is applicable to popularization and application.

The invention discloses NB-IOT-based high-voltage cable low-power-consumption online monitoring equipment. The NB-IOT-based low-power-consumption online monitoring equipment comprises a current sensor, an AD conversion module, a main control chip, a PC terminal, an upper computer, an NB-IOT wireless communication module, a sensor group and a power management module. According to the invention, the main control chip carries out priority classification on various required data through equipment working modes, sheath current data and fault recording data are set as a first priority, and the data of the level need to be transmitted in all working modes. Data such as temperature, vibration and equipment information are set as a second priority, and the data of the level can be transmitted only in a normal working mode. In the data transmission process, through the limitation of the sizes of the data packets, the data packets with the too large data size are removed, uploading of invalid data is reduced, in different working modes, the frequency of data communication and the transmission amount of data communication can also be correspondingly changed, communication power consumption is reduced, and normal operation of equipment is also guaranteed.

The invention discloses a method for an imaging geometric model based on a Pluecker straight line, and belongs to the field of surveying and mapping. The method comprises the following steps that a homonymous straight line is extracted from image space and object space; the image space is linearly and spirally moved to be linearly coplanar with the object space, and a coplanar condition equation is obtained; a Pluecker straight line imaging geometric model of a strong geometric condition can be built through the coplanar condition equation; an outer orientation element is calculated through the least square adjustment theory. The spiral movement of a space vector can be visually and clearly represented through the Pluecker straight line, the model is simple, and the geometric meaning is clear. Compared with a traditional method, the imaging geometric model based on the Pluecker straight line is higher in geometric locating precision and more stable in result.