2514 results about "Linear relation" patented technology

The invention provides a brain wave analysis method. The method uses classical time-frequency domain analysis and principal component analysis methods to solve the problem of electroencephalographic feature extraction, successfully extracts time-frequency domain parameters closely related to the tension, fatigue and relaxation of human bodies, maps the time-frequency domain parameters into principal component space, and uses a support vector machine to efficiently analyze non-linear relation in the principal component space so as to improve the accuracy and validity of interpretation.

The invention relates to a health monitoring method used for a cable system in a cable structure which carries out a plurality of mechanical calculations based on the mechanical calculation benchmark model of a structure; the calculation times are equal to the quantities of the cables. In each calculation, one cable is supposed to have unit damage; the result for each calculation forms vector for calculating a current cable force; a cable force change vector is obtained by using the vector for calculating the current cable force to subtract an initial cable force vector; all the cable force change vectors form a cable force change identity matrix. The noninferior solution of the current damage vector of the cable can be fast calculated by utilizing proper arithmetic such as multi-target optimizing arithmetic according to the approximating linear relation of the current cable force vector (formed by all the current cable forces that are actually detected), the cable force change identity matrix, a unit damage scalar and the current cable damage vector (formed by all the current damage quantities), thus being capable of more accurately confirming the position and the damage degree of the damaged cable.

The present invention is a system and method for statistical or probabilistic static timing analysis of digital circuits, taking into account statistical delay variations. The delay of each gate or wire is assumed to consist of a nominal portion, a correlated random portion that is parameterized by each of the sources of variation and an independent random portion. Arrival times and required arrival times are propagated as parameterized random variables while taking correlations into account. Both early mode and late mode timing are included; both combinational and sequential circuits are handled; static CMOS as well as dynamic logic families are accommodated. The timing analysis complexity is linear in the size of the graph and the number of sources of variation. The result is a timing report in which all timing quantities such as arrival times and slacks are reported as probability distributions in a parameterized form.

The invention provides a method for simultaneously determining one hundred pesticide residuals in a traditional Chinese medicine through ultrahigh performance liquid chromatography-tandem quadrupole mass spectrum. The method comprises the following steps: immersing traditional Chinese medicine powder with ultrapure water, extracting with acetonitrile containing 0.1% acetic acid through a homogenate method, carrying out solid phase dispersing purification with N-propylethylenediamine and graphitized carbon, detecting in a timesharing multi-reaction monitoring mode through the ultrahigh performance liquid chromatography-tandem quadrupole mass spectrum, and quantifying with an external standard curve method. 88% of pesticides have good linear relations in a range of 5-500ng / mL, correlation coefficients are above 0.99, and the correlation coefficients of above 98% of the pesticides are above 0.97; the average recovery rate of the pesticides with the low concentration of 10mug / kg, the middle concentration of 50mug / kg and the high concentration of 100mug / kg is 70-130%, and the relative standard deviation is less than 0.15; and the detection limit is equal to or less than 0.01mg / kg, so routine detection requirements can be completely satisfied. The method has the advantages of strong versatility, good selectivity, high sensitivity, and rapidness and simplicity.

The invention relates to a distributed optical fiber Brillouin sensing device for detecting temperature and strain synchronously and a method for detecting the temperature and the strain synchronously by use of the device. The method is based on the linear relation among the frequency shift change of the spontaneous Brillouin scattering in the optical fiber, external temperature change and external strain change, a compound sensing optical fiber is formed by two different types of sensing optical fibers, and the variation of the temperature and the strain can be distinguished at the same time through different responses of the two optical fibers to the external temperature change and the external stress change. According to the device and the method, the temperature change and the strain change in a sensing area can be detected at the same time, and the detection precision of an optical fiber distributed sensor based on spontaneous Brillouin scattering can be improved.

The invention relates to a dynamic blood pressure detection and calibration method of a radial artery. The method comprises the following steps: measuring a blood pressure value BP1 to perform first calibration by using oscillography; measuring a blood pressure value BP2 to perform second calibration by using correlation of an electrocardiosignal, a pulse wave signal and human arterial pressure; finally performing continuous monitoring of blood pressure by using the linear relation between pulse wave transmission time difference PWT of two different parts on a wrist and the human arterial blood pressure which are measured at the same time.

The invention discloses a method for screening traditional Chinese medicine effect related ingredients and a model building method. The method comprises the steps as follows: taking the researched traditional Chinese medicines as objects for preparing multiple sets of sample solutions containing chemical components with different concentrations; selecting part of the chemical components for HPLC (High Performance Liquid Chromatography) analysis, and investigating linear relations between the peak areas and the concentrations; selecting the multiple sets of sample solutions in the linear range, and determining the respective HPLC fingerprint spectrums and the medicine effect indexes of the sample solutions; and obtaining relations between the peak areas and the medicine effect indexes of the ingredients by adopting a linear regression analysis method in the linear relation range, and confirming the actions of the medicine effect related ingredients on the medicine effect indexes according to the positive value and the negative value of the standard regression coefficients and / or the t check results of the ingredients so as to screen out the traditional Chinese medicine effect related ingredients. The method is simple, convenient, easy to implement, reliable and good in commonality, can embody the characteristics of comprehensive actions of the multiple ingredients on the medicine effect indexes, is suitable for screening the traditional Chinese medicine effect related ingredients, and provides a technical data support for discovering and screening traditional Chinese medicine active ingredients.

The invention provides a magneto-acoustic-electric imaging system, mainly comprising an ultrasonic driving excitation source, an ultrasonic probe array, a control system, a magnet system, an electrode pair or a coil, and a signal detection processing system. The ultrasonic probe array is controlled to be at two modes of transmitting or measuring by the control system. An imaging method of the magneto-acoustic-electric imaging system is characterized by adopting acoustic radiation force to generate a focusing region inside a biological tissue and adopting an ultrasonic echo technology to measure the position of the focusing region and a mass point vibration speed. The area of the focusing region is small so that an inner static magnetic field in the focusing region, the mass point vibration speed and a current density of an assumption process are approximate to an average value, so that a linear relation between measured voltage and the current density of the assumption process is established.

The invention discloses wireless intelligent multi-physiological-parameter health supervision wrist type equipment. Electrocardio collecting equipment, a reflecting type photoelectric sensor, a temperature sensor and an inertial sensor are arranged on a wrist watch, so that the heart rate, blood oxygen, the pulse rate, skin temperature, moving speed and blood pressure parameters are displayed. The obtained parameters are sent to intelligent equipment for storing through a wireless module. During blood pressure parameter measuring, the linear relation principle existing in blood pressure and pulse wave transmission time is used, and a traditional sleeve type blood pressure measuring method is not used.

A state-matrix-independent dynamic process estimation method in real-time for weakly observable measurement nodes without PMU is only dependent on real-time measurement dynamic data of measurement nodes with Phasor Mesurement Unit (PMU) and measurement data of Supervisory Control And Data Acquisition (SCADA) system in electric power system or state estimation data. According to the SCADA measurement data or state estimation data at some continuous moments, the method utilizes recursive least squares solution to find a linear combination relationship between variation of measurement parameter to be estimated of nodes without PMU and variation of corresponding measurement parameter of nodes with PMU. Using the linear combination of relationship, the dynamic process of measurement nodes without PMU is estimated in real-time. The method provides high estimation precision and meets error requirements of engineering application.

The invention discloses an establishment method of a concrete compression strength curve. The establishment method of the concrete compression strength curve comprises the following steps: adopting a new standard ultrasonic rebound comprehensive method to detect concrete strength, and establishing a locally dedicated curve of the concrete compression strength detected by the ultrasonic rebound comprehensive method through experiments and statistical analysis of data so as to obtain an ultrasonic rebound detected strength regression formula. The locally dedicated curve for the concrete compression strength which is legally detected by the local ultrasonic rebound comprehensive method is established; the curve is more reliable than the nationally unified strength measurement curve, and significant for increasing the detection level; the curve shows a good linear relation with a sound velocity by a level detection method; furthermore, by the level detection method, in the practical application, only one side is detected to avoid the difficulty that centering is not accurate and the other side cannot be tested, and the establishment is better in operation; the detected flat detection sound velocity is corrected in proportionality coefficient, and then substituted in the locally strength measurement formula to presume the strength value, so that the problem that the strength of the concrete member is detected by the level detection method is effectively solved.

A method and apparatus for raising or lowering a tubular in a well wherein bails are conventionally coupled to elevator ears and locking assemblies secured to the outer sides of the lower bail eyes for remote controlled clamping to nipples integral with and extending from the elevator ears. The locking assemblies contain upper and lower jaws which, by a remotely controlled actuator, move in linear relation to each other and have concave clamping surfaces which join together to form a circular opening for receiving the elevator ear nipples. The nipples have enlarged diameters at their distal ends to prevent removal from the closed jaws. A remotely controlled link spreading mechanism spreads the bails to accommodate an elevator. Elevator ears may contain internal conduits for communication of power and control signals between the suspended elevator and the bails. The passages mate with a remotely actuated connector assembly.

The present disclosure provides an electric cylinder for actuating a door lock which may be easily attached to the existing door lock to prevent picking completely, and an electric cylinder door lock not having a keyhole.An electric cylinder for actuating a door lock comprises a motor wherein the tip of the motor shaft contacts the surface of a rotary dish plate, and the motor shaft is displaced by the operation of the motor to engage the rotary dish plate with a disc; a tailpiece which is connected to said rotary dish plate and is arranged in parallel to the motor, so that cables connected to the motor do not hinder the turning movement of the rotary dish plate; a cylinder case in which the disc, the rotary dish plate, the tailpiece and a stationary can are disposed in a linear relation and all electric cylinder parts are accommodated therein and in which the disc is put displaceably with a spring; wherein an electrode of the motor is changed to extend and contract the motor shaft, and the tailpiece is displaced by extension and contraction of the motor shaft to actuate a deadbolt.

The invention belongs to the technical field of infrared imaging, and specifically relates to a high-precision non-uniformity correction method for dynamic adjustment of integration time. The method of the invention comprises the following steps: determining linear relation between a detector response value and the integration time span under a fixed temperature; performing non-uniformity correction; calculating a non-uniformity correction parameter; performing self-adaptive adjustment of the integration time span according to an radiation temperature, determining the section that the integration time span is in, generating the non-uniformity correction parameter in real time in the current integration time, and completing the non-uniformity correction process. The method of the invention realizes continuous adjustability of the integration time in the working process of an infrared detector, solves the problem of inadaptation between the integration time span and the non-uniformity correction parameter of the infrared detector when the change range of the temperature of the scene is large, reduces influence of switching of the integration time on detector performance and recognition tracking, and can give full play to the detection performance of the detector in the working process.

The invention relates to a method for suppressing the torque ripple of a permanent-magnet motor based on space vector modulation. The method comprises the following steps of: adopting a vector control strategy that a permanent-magnet motor has a zero direct axis current so that electromagnetic torque and a quadrature axis armature current form a linear connection; and solving an additional quadrature axis injection harmonic current according to the linear connection of the electromagnetic torque of the permanent-magnet motor and the quadrature axis armature current so that an additional electromagnetic torque high-harmonic component generated by coupling the quadrature axis injection harmonic current and the direct axis permanent-magnet chain and fundamental and high-harmonic components in the orientation torque of the permanent-magnet motor have identical amplitude and opposite phases and can be mutually counteracted to suppress the torque ripple. The invention adopts the permanent-magnet motor as an implementation object, and the motor of the type can adopt advanced control protocols of vector control, direct torque control, and the like so that the method is simple and practical by editing control software without increasing the hardware cost of a control system and can obviously suppress the torque ripple of the motor and remain the constant motor characteristics of idling magnetic potential, torque output capability, and the like.

The invention relates to a CMOS band gap reference voltage source with a curvature compensation circuit, which comprises a start circuit, a reference core circuit, a curvature compensation circuit and a reference voltage output circuit, The invention uses the PTAT current to form a PTAT voltage on a resistance to check temperature change, wherein the current of ms1 mirror image forms the voltage V(P06) on RC2, while the voltage is in direct proportion with temperature, and the invention uses the exponent relation between the voltage difference VEB of QC2 emitter and base of BJT transistor and the collector current of BJT and the similar linear relation between the collector current and base current to form the dynamic compensation on reference voltage which converts the check voltage varying linearity along with temperature into the compensation current in exponent type.

The invention relates to an incremental health monitoring method in a cable system of a cable structure based on hybrid monitoring, which takes that linear relation between current value vectors of values to be monitored and initial value vectors of the values to be monitored, and the linear relation between unit damage value change arrays of the values to be monitored and current nominal damage vectors are similar into consideration on the premise of taking various parameters as values to be monitored, in particular when damaged cables are more or damage extent is larger, the linear relation characteristic is more obvious. In order to overcome the defect, the invention provides a method for using the linear relations to perform piecewise approximation on nonlinear relations based on the hybrid monitoring, divides a large interval into a plurality of continuous small intervals; in the small intervals, the linear relations are accurate enough and proper algorithms such as multiobjective optimization algorithm are utilized to calculate noninferior solutions of current cable damage vectors, and then positions of the damaged cables and the damage extent of the cables are determined accurately.

A multiple antenna wireless communication system using a DPD power amplifier and a method for controlling an amplitude of an input signal for a plurality of transmission paths of the DPD power amplifier are provided. The system includes a plurality of amplifiers, a plurality of couplers, a switch, a shared feedback path and a plurality of processors. The plurality of amplifiers amplifies an input signal directed to each of the transmission paths. The plurality of couplers couple amplified signals on respective transmission paths. The switch outputs at least one of the amplified signals coupled on the respective transmission paths. The shared feedback path provides the amplified signal output from the switch to a plurality of processors. The plurality of processors compare a feedback signal provided through the shared feedback path with the input signal and pre-distort the input signal such that the input signal and the amplified signal have a linear relation with each other.

The invention discloses a health monitoring system of a cable system in a cable structure on the basis of strain monitoring; a plurality of times of mechanical calculation is carried out on the basis of the reference model of the mechanical calculation of a structure, the times of the calculation is equal to the number of cables. Supposing that only one cable has unit damage during each calculation, the calculation result of each time constitutes a current strain calculation vector; a strain change vector is obtained by that each current strain calculation vector minus an initial strain vector; all the strain change vectors constitute a unit damage strain change matrix. According to the similar linear relation between the current strain vector (constituted by the current measured strain of all the given points) and the initial strain vector, the unit damage strain change matrix, an unit damage scalar and a current cable damage vector (constituted by current damage amount of all cables), the noninferior solution of the current cable damage vector can be figured out fast by utilizing the suitable algorithms of multi-objective optimization algorithm, etc., therefore, the position and the degree of damage of the damaged cable can be determined accurately.

The invention discloses a method for determining uranium lead age of baddeleyite by using secondary ion mass spectroscopy, which belongs to the field of secondary ion mass spectroscopy dating method in geochronology and particularly relates to a method applied to a large secondary ion mass spectrometer having oxygen blowing conditions. In the measurement method described by the invention, the degree of vacuum in a sample cavity of the spectrometer is enabled to reach 1E-8Torr at first, and an oxygen leak valve is then opened to blow the oxygen with the purity of 99.99% to the surface of the sample so that the oxygen partial pressure of the sample cavity reaches 1E-5Torr. The method of the invention can reduce the optical axis effect, which is exhibited by secondary ion mass spectroscopy during the uranium-lead dating of baddeleyite, to be below 2%, thus the accuracy of uranium-lead age when the baddeleyite is subjected to secondary ion mass chromatographic analysis is significantly improved. After uranium-lead measurement ratio is obtained, uranium-lead fractionation correction is performed by adopting a linear relation between ln(Pb+ / U+) and ln(UO2+ / U+) in order to obtain accurate age.

The invention relates to a high-temperature-resistant copolymer oil well cement retarder and a preparation method thereof. The preparation method comprises: respectively weighing four polymerization monomers such as 2-acrylamide-2-methylpropanesulfonic acid, diallyldimethylammonium chloride, maleic anhydride or itaconic acid or fumaric acid, and acrylic acid or methacrylic acid according to the mass ratio of 45-80:5-17:7-18:8-20, dissolving the first three monomers in water, then adding sodium polyphosphate and diphenylcarbazide, then successively adding a chain transfer reagent and an initiator, and finally dropwise adding the forth monomer, performing heating reaction and adjusting the pH value, so as to obtain the copolymer retarder. The invention also provides the high-temperature-resistant copolymer oil well cement retarder prepared by the above preparation method. The retarder is resistant to a high temperature up to 230 DEG C and is weak in dispersibility at a high temperature, the cement paste strength develops fast at a low temperature, the addition amount of the retarder has good linear relation with the cement paste hardening time, and the cement paste comprehensive performance is good.

A tomography reconstruction method of fluorescence molecules based on a linearity relation belongs to the technical field of the image reconstruction in biomedicine. The reconstruction method is characterized in that the method sequentially comprises the following steps: 1. the outside surface outline is obtained by picture processing and numerical fitting based on the map data of a mouse used in experiment; 2. the outside surface outline is led into a finite element software package for meshing; 3. every excitation light source, and finite element grid nodes which are corresponding to corresponding fluorescence monitoring points are found; 4. aiming at one given excitation light source sk, a linear relation matrix Wsk between fluorescence intensity which is detected from surface and unknown fluorescent probe distribution is established; 5. aiming at all excitation light sources, a general linear relation matrix is generated; 6. after the linear relation is obtained, a algebra reconstruction method is used for iterating the fluorescent probe distribution which approaches the reality. The method is characterized in that non-uniform optical parameters can be handled and the precise linear relation between the fluorescence intensity which is detected from surface and the unknown fluorescent probe distribution is rapidly established.

The invention relates to a Beidou signal capturing method in a weak signal environment. The method comprises the following steps: S1, arranging a down-conversion unit and carrying out down conversion processing on a received intermediate-frequency sampling signal; S2, carrying out NH code stripping on the received signal respectively, carrying out transformation into a frequency domain signal, carrying out multiplying with a multiplexing sum of a local code frequency domain value and then carrying out inverse transformation into a time domain; S3, carrying out conjugate multiplication on a coherent accumulation value at current time and a coherent accumulation value at previous time and carrying out summation; and S4, carrying out taylor series expansion on an amplitude difference value of two-side spectral lines of the peak value of the coherent integration result, deriving a quasi-linear relation of a frequency value and the amplitude difference value, and solving a frequency estimation value by using the linear relation. According to the invention, correlation calculation can be carried out on coherent values corresponding all code phases by one time; the signal to noise ratio is improved and the detection efficiency is improved; and the squaring loss of the non-coherent integration can be reduced. A problem of bit flipping caused by navigation data modulation can be solved, thereby improving the detection probability; the code phase and carrier wave frequency-offset estimation precision is enhanced; and the calculating speed and the calculating precision are guaranteed and the good stability and practicability are realized.

The invention provides an adjustment method for steam turbine control valve flows in a thermal power plant. The adjustment method includes the following steps that step1, a control valve optimization experiment is performed, all experimental data are determined, and a load up-and-down experiment needing to be performed for a current valve curve linear relation, a high control valve flow characteristic experiment, and determining on maximum strokes and sequence valve curves of all high control valve equalizing valves, sequence valve curves after on-line inspection and modification and maximum flow point positions of intermediate control valves are sequentially performed; step2, a control valve flow curve optimization scheme is obtained through calculation and analysis performed on control valve flow curve experimental data. The adjustment method can effectively improve the flow characteristic of steam turbine control valves, improve load variation and primary frequency modulation performance of a generator set, effectively improve adjustment quality of the generator set, and improve running safety and service life of high control valves and the intermediate control valves and economy of the set.

The invention discloses a multiplex real-time fluorescent quantitation PCR method capable of detecting porcine circovirus, porcine parvovirus, porcine pseudorabies virus and hog cholera virus at the same time. The method of the invention detects that the four virus are all in good linear relations at the same time, all ten times serial dilution points of constructed normal plasmid are all in one straight line, CT value and copy number are in good linear relation, and regression analysis shows that the related coefficient of the CT value and the copy number is R<2> more than 0.99.The multiplex real-time fluorescent quantitation PCR method has the advantages of excellent specificity, sensibility and stability, which can rapidly, sensitively and differentially detect the four virus with serious harm to the economy and can be used for early diagnosis of virus infection.

A spring-biased pivoting squeegee 10 provides a head 12 pivotally attached to a handle 16. The head 12 is movable between a rest position, in which the head 12 is angularly displaced from the handle 16, and a biased position in which the head 12, handle 16, and wiping blade 14 are in linear relation. In the biased position, the wiping blade is maintained at an optimum angle for cleaning a glass surface even with the handle 16 held generally perpendicular to the glass. A spring 60 is fully contained in the head 12 and biases the head toward the rest position. A tension adjustment knob 80 in the head 12 permits adjustment of the spring 60 to a tension level according to the ergonomic requirements of a user.

The invention belongs to the technical field of detection, and particularly relates to a method for detecting heavy metal ions in aqueous solution by using a fluorescent probe. The method, by providing bovine serum albumin functionalized gold nano-particles serving as the fluorescent probe and using the fluorescent probe for detecting mercury ions in a water body, obtains high sensitivity and selectivity. The method utilizes bovine serum albumin modified gold nano-particles as the fluorescent probe; during the detection, various amino and carboxyl groups on the surface of the probe can be coordinated with the heavy metal ions so as to ensure that the fluorescent probe quenches; the initial concentration of the mercury ions and the strength of fluorescence have good linear relation; and the existence of the heavy metal ions, namely mercury in the aqueous solution can be indicated through the fluorescent detection method. The method does not need large-scale instruments, can realize in-situ quick detection, has low detection limit, can be applied to more conditions and ranges, and has simple operation and low cost; and a used reagent and the operation process have no toxic or side effect.

The invention discloses a pointer instrument positioning and identifying method based on machine vision. The position of an instrument panel in an instrument cabinet image is accurately positioned andan instrument reading is automatically recognized. The method comprises the steps of (1) acquiring the instrument cabinet image; (2) carrying out segmentation processing on the instrument cabinet image to obtain an instrument panel image; (3) preprocessing the instrument panel image; (4) acquiring all edge contours in the instrument panel image by using a Canny edge detection method; (5) findingall linear contours in the obtained edge contours by using Hough transform; (6) screening out the linear contours where a pointer in the instrument panel is located through length characteristics of the linear contours; (7) calculating an average value theta of an inclination angle between the two linear contours where the pointer is located; and (8) calculating out a pointer reading according toa linear relation between the linear inclination angle and an instrument scale. By the adoption of a positioning and detecting technology, the method has the characteristics of accurate positioning and reading, good anti-noise performance and efficient and rapid image processing.