61results about How to "Stability analysis" patented technology

The invention discloses an accurate measurement and calculation method for parameters of a power transmission line. In the method, the parameters of the power transmission line are accurately calculated according to short-circuit impedance ZS and open-circuit impedance ZO of the power transmission line. The method comprises the following steps of: measuring the short-circuit impedance ZS and the open-circuit impedance ZO of the power transmission line with length of D; acculate calculating characteristic impedance zc and propagation coefficient gamma of the power transmission line according to a calculation formula provided by the invention; further, calculating impedance z and admittance y under the condition of unit length of the line through the formulas of z=zc gamma and y=gamma / zc; and accurately calculating impedance Z' and admittance Y' of an equivalent pi circuit of the power transmission line according to the calculation formula provided by the invention. By adopting the measurement and calculation method provided by the invention, the accuracy for the parameters of the power transmission line can be greatly improved, manpower and material resources are saved, tide current of a power system is stably analyzed; protection setting is performed; and fault positioning is more accurate.

An optical test device for the tissue of living body is composed of light emitter unit, optical fiber probe, optical spectrum analyzing and data processing unit, emitting optical fibers, receiving optical fibers, and optical switch. Its detecting method is also disclosed.

The invention discloses a method and a device for the characteristic analysis of a human body based on shoes wearing footprint images, and belongs to the technical field of criminal investigation. The method comprises the following steps: S1, preprocessing the shoes wearing footprint images: removing the interference on shoe sole patterns in the shoes wearing footprint images through an image filter operation, wherein the dimension of the filter is determined according to the size of the pattern adaptively; S2, carrying out multi-layer pressure surface extraction on the shoes wearing footprint images; S3, obtaining the morphological characters of the footprints; and S4, building mathematic models between the morphological characters and stature, age, posture and posture; and obtaining the characteristics of the human body. According to the method provided by the invention, the characteristic analysis of the human body can be realized automatically, and the characteristic analysis of the human body can be analyzed stably and precisely without the influence caused by the dimensions of the shoe sole patterns.

The invention provides a device and method for testing arsenic through an atomic fluorescence method. The device comprises a hydride generating device, a dielectric barrier discharging reactor, a power source, a gas circuit and an atomic fluorescence spectrometer. The method for testing an atomic fluorescence spectrometer pre-concentrated with arsenic comprises the steps that an arsenic hydride is generated, at the atmosphere of argon and oxygen mixed gas, the dielectric barrier discharging reactor performs a discharging reaction, and arsenic capture is completed; at the atmosphere of argon and hydrogen mixed gas, the dielectric barrier discharging reactor performs a discharging reaction, arsenic release is completed, and the content of the released arsenic is analyzed through the atomic fluorescence spectrometer. According to the device, the problem that capture and release of arsenic elements are not easily controlled by the dielectric barrier discharging device is solved, and the device has the advantage that online efficient concentration and accurate and stable analysis of trace amount arsenic in a sample can be achieved due to the fact that the device is directly connected with an optical spectrum instrument in series.

The invention relates to a multi-subject fMRI data analysis method combining ICA and shift invariant CPD, and belongs to the field of medical signal processing. The method comprises: taking the CPD as a center, and the ICA as a main and auxiliary combined way in a pre-processing step; pre-processing the ICA to provide a joint mixing matrix to the shift invariant CPD; gradually decomposing the joint mixing matrix to obtain multi-subject shared TC, and each-subject delay and each-subject intensity corresponding to the shared TC by a rank-one estimation method through the shift invariant CPD; and reconstructing the joint mixing matrix by using the output of the shift invariant CPD, and estimating a multi-subject shared SM by using a least square method . With the adoption of the method, stable and more effective analysis can be performed on multi-subject fMRI data. When between-subject SM difference and between-subject TC difference are greater, the advantage of the method is more obvious, estimated shared SM component and shared TC component have higher correlation with a prior reference signal, and TC large time delay has high estimation accuracy and a small amount of calculation.

The invention discloses a method and a device for human body feature analysis and based on barefoot or stocking-wearing footprint images and belongs to the technical field of criminal investigation. The method includes the following steps: S1, performing multilayer pressure face extraction on the barefoot or stocking-wearing footprint images; S2, acquiring at least the following footprint form structure features including foot length, foot width, heel width, arc width and positions of lower-edge convex points of a sole stress surface according to multilayer pressure face images of barefoot or stocking-wearing footprints; S3, respectively establishing mathematic models between the footprint form structure features and body height, age, posture and gender; inputting the above form structure features into the mathematic models to acquire human body features. By the method and device, human body feature analysis can be realized automatically, and human body feature analysis is stable and accurate.

The invention discloses a fire vehicle water pump control system which comprises an information collecting and processing module, a pump operation logic control module and a pumping pressure real-time control module, wherein the pumping pressure real-time control module carries out closed-loop control on the revolving speed of the engine according to a user key input signal and a sensor input signal transmitted from the information collecting and processing module; and therefore, when the fire vehicle injects water or the mixed liquid of water and foam in the fire hazard field, the outlet pressure of the water pump is kept constant as much as possible. According to highly-integrated visualizing information, the operation of the complete machine, data acquisition, information displaying, data analysis and data processing and controlling can be more stably, simply and visually carried out.

The invention provides a foreign matter inspection system for rail transit. The method is used for detecting a border crossing event on a railway and judging whether foreign matters cross the border or not. The system is characterized in that the system comprises at least one induction camera device which is used for shooting the position where the border-crossing event occurs on the railway to obtain a border-crossing video image when the border-crossing event occurs is inducted, and a plurality of clearer video frames in the border-crossing video image are used as a group of event video frames to be sent to an image processing device. The system also comprises an image processing apparatus, wherein the image processing module is used for performing image processing on an event video frame to obtain corresponding border crossing event information and sending the border crossing event information to security personnel responsible for railway maintenance; the image processing apparatusincludes an image-side communication unit, an image-side control unit, a video frame processing unit, a video frame temporary storage unit, an image analysis and generation unit, a foreign matter determination unit, and an event information acquisition unit.

The invention relates to a device for online fluorescence detection of bromates. The device comprises a liquid constant-flow system, a thermal reaction system, a reaction stopping system, a fluorescence detection system and a signal acquiring and processing system. The device for the online fluorescence detection of bromates is based on online heating and online control systems; the adding order and the equivalent weights of acid and base reagents are regulated online, the pH value of the reaction system is accurately controlled, the fluorescence quenching reaction is stopped immediately, and physical cooling for controlling the reaction speed is not needed; the device is simple and efficient to operate; besides, the problem of great difference of the cooling rates of the reaction liquid in different directions due to the physical cooling is avoided and the problem of poor fluorescence intensity change stability due to uneven reaction caused by physical cooling factors in the sample cooling stopping treatment during traditional fluorescence analysis is solved; the analysis efficiency is high and the analysis result is stable; the device can be applied to quick and accurate analysis of trace bromates in a sample to be tested.

The invention discloses a compression air foam mixing control system of a fire truck, which comprises an information collection and state display module, a foam mixing logical control module and a foam mixing proportion real-time control module. The foam mixing proportion real-time control module controls rotating speed of a foam mixing motor according to user panel key input signals transmitted by the information collection and state display module and current water flow and foam flow which are obtained by real-time collection through an internal digital PID controller to achieve the function of maintaining foam mixing proportion stability no matter how the water flow changes. The compression air foam mixing control system of the fire truck enables operation, information display, data collection, data analysis, data processing and data control of a whole machine to be more stable, simple, convenient and audio-visual through a highly integrated visual information system.

The invention discloses a method for detecting the content of phosphatidylserine in food. The method comprises the following steps: (1) weighing food to be detected, preparing a sample aqueous solution, extracting with a mixed solution of trichloromethane and methyl alcohol, filtering and evaporating filtrate to dryness; (2) extracting the dried substance obtained in the step (1) by a mixed solution of trichloromethane, methyl alcohol and water, filtering and standing filtrate; and (3) carrying out high performance liquid chromatography detection on a solution at an under layer. The method has the advantages of high sensitivity, high precision and high accuracy.

The invention provides an on-line pretreatment device of a chromatographic gas sample, and the device is mainly used for on-line pretreatment of gas samples of an ethylene cracking furnace. The pretreatment device is a box structure, and is mounted between an outlet of an online analysis sampler of the ethylene cracking furnace and an on-line chromatogram. The on-line pretreatment device is mainly composed of a buffer sedimentation tank, a visual liquid-discharge tank, a gas filter, a pressure regulating valve, a cleaning transfer valve, a steam system and insulating parts. Inner surfaces of the connecting pipelines use ultramicro nanostructures with a low surface tension. The chromatographic gas sample can be treated to remove water, solid impurities and heavy hydrocarbon droplets, and outputted to the on-line chromatogram with a stable flow.

The invention discloses a side slope three-dimensional finite element mesh generation method under a complex geological condition. The method comprises the following steps that: 1) on the basis of a CAD (Computer-Aided Design) platform, extracting topographic contour and geological interface elevation point data; 2) establishing the mesh node data of target range plane projection; 3) on the basisof an inverse distance interpolation method, constructing three-dimensional mesh node data in the target range; 4) creating the mesh node and the unit of a specified node sequence to obtain a three-dimensional finite element mesh; and 5) checking the quality of the generated finite element mesh, and if the quality is not qualified, returning the step 3) to regenerate the finite element mesh. The method provides a feasible finite element mesh division thought, the three-dimensional finite element calculation mesh under the complex geological condition can be established at high efficiency and high accuracy, the quality and the amount of the finite element mesh can be effectively controlled, repeatability is high, simplified processing is not required, and a finite element calculation effectis good.

The invention discloses a method of aggregating multi-send extra-high voltage alternating current and direct current hybrid grid system stability indexes, and belongs to the technical field of electrical power system reliability. The method comprises the following steps of 1, selecting n indexes of extra-high voltage alternating current and direct current hybrid grid system stability analysis; 2, building a multi-send extra-high voltage alternating current and direct current hybrid grid system stability analysis index system; 3, properly arranging weights according to each index; 4, aggregating the multi-send extra-high voltage alternating current and direct current hybrid grid system stability comprehensive indexes according to the index weights. The method provides a comprehensive and effective quantification index for the stability of an extra-high voltage alternating current and direct current hybrid grid system containing multiple outside sending direct currents. Combined with the characteristics of a multi-send extra-high voltage alternating current and direct current system, a comprehensive analysis is conducted to the stability of the extra-high voltage alternating current and direct current hybrid grid system containing multiple outside sending direct currents, the loophole that analysis to a sending end power grid is less is filled, and the method provides comments and suggestions for future planning and building of the sending end power grid.

The invention belongs to the technical field of hybrid cloud, and discloses a multi-workflow load balancing method and system in a hybrid cloud environment. The multi-workflow load balancing system inthe hybrid cloud environment comprises a cloud registration login module, a load information collection module, a resource monitoring module, a central control module, a scheduling module, a balancing module, a disaster recovery module, and a display module. According to the invention, resources of the hybrid cloud can be monitored in a unified manner through the resource monitoring module, so that the resource monitoring efficiency of the hybrid cloud can be improved. Meanwhile, through the disaster recovery module, on-demand distribution and elasticity of the public cloud data center can beutilized, a large number of data resources do not need to be occupied during idle time, the probability of secondary disasters of the system is reduced, the risk of system data communication is reduced, the data safety is improved, the resource investment is reduced, faults are more rapidly handled, and the processing mode is simpler and more convenient.

The invention discloses an infrared-image foreground detection method and infrared-image foreground detection equipment, and belongs to the technical field of data processing. The method includes: collecting N frames of infrared images without moving target interference to use the same as training images, and calculating an average brightness value of each frame of training image; analyzing an image brightness value of each pixel position, and obtaining distribution probability of the different brightness values by counting to obtain image background pixel position-brightness value distribution relationships; and carrying out foreground detection on a currently-collected infrared image according to the image background pixel position-brightness value distribution relationships to obtain aforeground graph of the currently-collected infrared image. Through background modeling, a relatively stable background region can be obtained, interference of moving objects or noises on a backgroundand subsequent foreground operations can be reduced, and the background can still be stably analyzed even in a case of strong infrared light for obtaining a precise foreground region.

The invention discloses a dam back open air seepage flow monitoring system and a measured value attribution analysis method. The method comprises the following steps: determining seepage flow measured value influence areas and influence factors based on measuring point positions, landforms and rainfall characteristics; determining corresponding monitoring items, measuring points and instruments based on the spatial and temporal distribution of the sensitive factors in the influence area; determining lag time according to a corresponding mathematical model, and dividing the actually measured data sequence of the seepage flow into three types, i.e., a type which is only influenced by reservoir water seepage, a type which is obviously influenced by rainfall and an uncertain type; respectively constructing a rainfall-reservoir water coupling seepage data assimilation model and a reservoir water independent seepage data assimilation model according to the seepage flow measured data of the time period obviously affected by rainfall and the time period only affected by reservoir water seepage; according to the assimilated sample, respectively establishing a lightweight time convolution model of seepage flow under the influence of rainfall and only under the action of reservoir water seepage, and separating a rainfall influence component and a reservoir water seepage component according to the difference between the lightweight time convolution model and the reservoir water seepage component; accurate separation of seepage components under the rainfall condition is achieved, and support is provided for safety analysis of dam seepage.

The invention discloses a method and a device for sex characteristic analysis based on a footprint image, belonging to the field of criminal investigation. The method disclosed by the invention comprises the steps of S1. carrying out multi-layer pressure surface extraction on the footprint image; S2. at least obtaining the footprint form structural characteristics including the foot length, the foot width and the areas of various pressure surfaces according to multi-layer pressure surface images of the footprint; and S3. establishing a mathematical model among the footprint form structural characteristics and sexes, and inputting the form structural characteristics into the mathematical model so as to obtain the sex characteristics of a footprint owner. According to the method, sex characteristic analysis can be automatically realized; and sex characteristic analysis is steady and precise.

The invention discloses a voltage-gradient-based steepest voltage collapse margin calculation method. According to the method, a Thevenin equivalent parameter corresponding to a system at a monitored load bus of the system with a failure is calculated, the negative gradient direction of bus voltage after the system fails is taken as a constraint condition, load power is taken as an objective function, a modified objective function is constructed by a Lagrange factor method, an extreme point is calculated, and the steepest voltage collapse margin of the load bus is further obtained. The method is applied to the offline and online stability analysis and operation control of a power system, and is favorable for line staff and analysts of the system to identify the condition of the system with the failure and to take effective safety control measures, so that the stable operating level of the power system is improved.

The invention provides an image processing device and an image processing method. A pixel set formation unit in an image analysis unit of an image processing device forms pixel sets from original images subject to analysis. A principal analysis unit of the image analysis unit performs principal component analysis in units of pixel sets. A synthesis unit synthesizes results of analysis in units of pixel sets so as to generate images of eigenvectors of a size of the original images. An image generation unit displays the images of the eigenvectors and stores data for an image generated by using the images of the eigenvectors in a generated image storage unit.

The invention provides a device and method for determining zinc by electrothermal evaporation atomic absorption spectrometry, including a sample boat, an electrothermal evaporation device, a pre-enrichment device, a carrier gas path, a carrier gas mass flow meter, a release gas path, a T Type atomizer-atomic absorption spectrometer, the pre-concentration device is composed of tungsten wire, tungsten wire power base and pre-concentration device cavity, the tungsten wire is installed on the tungsten wire power base, and the pre-concentration device is placed overhead Center of the device cavity. The solid injection atomic absorption spectrometry for the determination of zinc includes dehydrating and ashing the sample to be tested in the air to obtain an inorganic residue; The aerosol of the tungsten wire is in contact with the tungsten wire, and the zinc is pre-enriched by the tungsten wire; the temperature of the tungsten wire rises to about 1800°C, and zinc atoms are released, and the zinc content is analyzed by an atomic absorption spectrometer. The device solves the problem of matrix interference in the determination of zinc by electrothermal evaporation atomic absorption spectrometry with solid sample introduction, and its advantage is that it can realize accurate and stable analysis of zinc content in the sample without digesting the sample.

The invention discloses a method of exploring morphological characteristics of a gorge bank slope deep-buried underground large karst cave. According to the method, through excavating a horizontal exploratory cave to the karst cave at the gorge slope, if the karst cave is a filled karst cave, the tail-end section of the exploratory cave is expanded to form an operation room, the operation room is internally provided with a geological drilling rig for karst cave exploration operation, and if the karst cave is a half-filled or non-filled karst cave, the horizontal exploratory cave only needs to be communicated with the karst cave. karst cave filling material can be sampled, analyzed and tested in a near distance, and on the basis of improving the karst cave exploration precision, the drilling engineering quantity and the exploration fee can be saved obviously, and the exploration period is shortened.

The invention discloses a method for simultaneously determining arsenic forms of roxarsone, arsanilic acid and degradation products of same in soil, which comprises the following steps: adding a mixedextracting solution of NaH2PO4 and H3PO4 in a volume ratio of 9: 1 into a soil sample, uniformly mixing same, heating and extracting in a microwave digestion instrument, and centrifugally filtering the obtained extracting solution for high performance liquid chromatography-inductively coupled plasma-tandem mass spectrometry determination. The arsenic forms of roxarsone, arsanilic acid and degradation products of the same in the soil can be simultaneously and quickly determined; the determination accuracy, precision and stability all meet the requirements of environmental residue analysis anddetection; an adding standard recovery rate of roxarsone, arsanilic acid, monomethyl arsenic, dimethyl arsenic and inorganic arsenic ranges from 73.4% to 105.0%; the instrument detection limit rangesfrom 0.85 to 1.59 microgram / L, the precision ranges from 1.7% to 3.8%, and the requirement for polluted soil detection is met.

Disclosed is a leukocyte analysis method which can classify and count leukocytes stably and with high accuracy even when a sample containing the leukocytes is diluted at a low dilution ratio or even when the flow rate of the sample during the analysis is slow. Also disclosed is an analysis reagent for use in the method. The leukocyte analysis method comprises: a mixing step of mixing a sample containing leukocytes and erythrocytes with an analysis reagent containing a surfactant capable of reacting with leukocytes; and a measurement step of allowing the mixed solution of the sample and the analysis reagent to pass through a fine pore, measuring a signal detected at the time of passage, and classifying and counting the leukocytes in the sample. In the method, the analysis reagent additionally contains a nonionic surfactant, and the nonionic surfactant has a sugar residue as a hydrophilic moiety and an aliphatic chain as a hydrophobic moiety.

The invention relates to a DSC-ARC combined thermal analysis method applied in the field of thermal analysis of materials. Experimental images of a DSC and an ARC are analyzed to overcome a defect caused by the analysis of single experimental results. On the basis of the combined image analysis, the specific performance of the thermal effect of materials can be understand clearly and thus people are assisted in understanding the thermal effect of the sample deeply, thereby analyzing and determining the potential thermal hazard of the sample. According to the sample thermal effect obtained fromthe analysis result, the relevant departments can formulate implementation plans accordingly and thus take protective measures to reduce the occurrence of accidents.

The invention provides a tungsten filament pre-enrichment device for determining zinc and a using method. The device comprises a boat-shaped sample injector, an electric heating evaporation device, a pre-enrichment device, a carrier gas path, a carrier gas mass flowmeter, a release gas path, an atomic fluorescence spectrometer and the like. A solid sample injection atomic fluorescence spectrometry for determining zinc comprises dehydrating and ashing a sample to be determined in air to obtain inorganic residues; increasing the temperature of the sample residues to about 1600DEG C in an argon and hydrogen mixed gas atmosphere, wherein aerosol containing zinc atoms is in contact with a tungsten filament and zinc is pre-enriched by the tungsten filament; increasing the temperature of the tungsten filament to about 1800DEG C to release zinc atoms, and analyzing the content of zinc by using the atomic fluorescence spectrometer. The device solves the problem of matrix interference during zinc determination by using the solid sample injection electric heating evaporation atomic fluorescence spectrometry, and has the advantage that the content of zinc can be accurately and stably analyzed without digesting the sample.

The invention discloses a method for evaluating safety reserve of a rock-soil slope by using a centrifugal model test. The method for evaluating the safety reserve of the rock-soil slope by using thecentrifugal model test comprises the steps of scaling down a prototype of the rock-soil slope to be researched to make a rock-soil slope centrifugal model; placing the rock-soil slope centrifugal model in a centrifugal device; carrying out slope failure test on the rock-soil slope centrifugal model according to a set times of accelerated speed; when the failure of the rock-soil slope centrifugal model occurs under an effect of the set times of accelerated speed, lifting the rock-soil slope centrifugal model for an angle, and then continuing to carry out a centrifugal slope failure test; when the failure of the rock-soil slope centrifugal model just occurs, carrying out inverse analysis on cohesion strength of rock-soil slope soil according to a critical condition that the safety coefficient on a failure surface is less than or equal to 1; calculating the safety coefficient of a most dangerous slip surface of the rock-soil slope with the same soil according to the cohesion strength; andobtaining the safety reserve of the rock-soil slope to be researched by comparing the safety coefficient with the safety coefficient of the failure surface when the failure of the rock-soil slope with the same soil just occurs.