61results about How to "Stability analysis" patented technology

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.

A biochemical analysis device using a microchip in which the base line of the analysis device can be stabilized. The biochemical analysis device has a centrifugal rotor which has a chip holding part for holding a microchip and which is subjected to rotary driving; a light source part; and a light detector, in which the microchip is a microchip in which the centrifugal force act by rotation of thecentrifugal rotor and in which pretreatments are performed in which the measurement cell of the microchip is irradiated with light from a light source, the light which has passed through the measurement cell being received in the light detector, and measuring of the light intensity in which the quantity of light absorption by the test liquid is measured within the measurement cell and the test liquid is analyzed, while rotation of the centrifugal rotor is stopped.

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 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 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.

An online dynamic screening system for accidents comprising hypothetical disturbances experienced by a power system, the screening system comprising: a dynamic accident screening program using a plurality of accident classifiers based on finding a control instability equilibrium of the power system Multiple incidents are assessed using a point approach called the Stable Zone Boundary Controlled Unstable Equilibrium Point method by applying the sequence of incidents to the Network Islanding Problem Classifier, the S.E.P Problem Classifier, the Large Stable Zone Classification classifier, exit point problem classifier, ray regulation problem classifier, energy function problem classifier, CUEP convergence problem classifier, and control UEP (Unstable Equilibrium Point) classifier to form the first group of stable accidents and the second group of non- a stable or undecided accident; and a time domain simulation program for determining which of said second set of accidents is unstable.

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 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 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.