36 results about "Test sample" patented technology

The invention discloses an SAR image classification method for an SVM classifier by using a hybrid kernel function based on wavelet properties, belonging to the technical field of image processing and mainly solving the problem that effectiveness in image characteristic extraction is not sufficient. The method comprises the following steps: firstly, imputing training and testing sample images, and normalizing and marking the sample images; secondly, decomposing the normalized sample images, respectively extracting a plurality of characteristics from various decomposed sub-zones, and storing the characteristics in terms of a structural body of T1 x r; thirdly, according to the characteristics of the sub-zones, constructing the hybrid kernel function based on wavelet properties for the SVM classifier (see the formula on the lower right side, wherein, in the formula, Xi and Xj respectively indicate an ith sample image and a jth sample image, i and j are both less than or equal to 1, xik and xjk respectively indicate the kth chacteristics of the ith sample image and the jth sample, and Rhok is a convex combination coefficient; and fourthly, finishing the classification of the image characteristics by optimizing the convex combination coefficient in the hybrid kernel function. The method has the advantage of high image classification recognition rate and can be used for machine learning and mode identification.

The invention discloses a linear frequency modulation ultrasonic excitation-based infrared thermal wave nondestructive testing method and system. The method comprises the following steps: S1, adjusting spatial positions of an ultrasonic excitation head and a tested sample, and switching on a switch of a cylinder pressing device to ensure that the ultrasonic excitation head is in close contact with the surface of the tested sample, controlling a signal generator to generate a linear frequency modulation pulse signal through a computer, and driving an ultrasonic generator and power amplifier unit to ensure that the ultrasonic power regularly changes according to the linear frequency modulation pulse signal; S2, starting an ultrasonic generator, and acquiring a surface thermal wave signal of the tested sample; and S3, processing the acquired surface thermal wave signal, extracting time-frequency domain characteristic information of the surface thermal wave signal, and integrating the time-frequency domain characteristic information to obtain a characteristic image for characterizing internal defects of the material. The system comprises an ultrasonic excitation device, the ultrasonic generator and power amplifier unit, the signal generator, a focal plane thermal infrared imager and the computer. The internal defects of the material can be rapidly and accurately detected by the method and the system.

The invention discloses a high-precision detection method for SBS (styrene butadiene styrene) contents in SBS modified asphalt. The high-precision detection method includes the steps: preparing various SBS modified asphalt with the known SBS contents; respectively testing an infrared spectrum based on Fourier transformation for the SBS modified asphalt, calculating a specific value A of a characteristic absorption peak area A1 of an SBS modifying agent in the SBS modified asphalt and the sum of the characteristic absorption peak area A1 of the SBS modifying agent and a characteristic absorption peak area A2 of base asphalt, and building a standard curve equation of A values of the SBS modified asphalt corresponding to the SBS contents; testing the SBS modified asphalt to be detected by the aid of the infrared spectrum based on Fourier transformation, calculating corresponding A values, and substituting the corresponding A values into the standard curve equation to obtain the SBS contents in the SBS modified asphalt to be tested. The high-precision detection method has the advantages that the detection method is simple, the influence of the thickness of a modifying asphalt test sample on a test result is eliminated by the aid of the specific value of the characteristic absorption peak areas, section between characteristic absorption peak areas of an original creation infrared spectrum is selected, and the SBS contents in the SBS modified asphalt are rapidly and precisely detected.

The invention discloses a method for measuring nitrites by surface enhanced Raman spectroscopy (SERS). The method comprises the following steps of: 1. preparing an analytic solution of nitrates with known concentrations, and measuring the SER scattering peak intensity value at 1506cm<-1> of the analytic solution to be I; 2. preparing a blank control system excluding nitrates, and measuring the SER scattering peak intensity value of the system to be I0; 3. computing delta I equal to I0 minus I; 4. formulating a working curve of the concentrations of nitrates based on delta I; 5. preparing an analytic solution of tested samples, measuring the SER scattering peak intensity value of the analytic solution to be the I sample, and computing the delta I sample equal to I0 minus I sample; and 6. computing the concentrations of nitrates in the tested samples according to the working curve. Compared with the existing methods, the method has the advantages that the method is simple and convenient to operate, and the reagent is accessible and has high sensitivity and good selectivity.

The invention discloses an ultrasonic technology-based method for detecting and evaluating damage of subgrade soil materials in seasonal frozen regions. The method comprises the following steps: an initial state sample and a test sample are prepared according to an evaluation scheme on the basis of a formed sample meeting requirements of subgrade soil; the initial state sample is not subjected tofreeze-thaw cycles and has humidity being the evaluation standard moisture content; the test sample is a soil sample which is subjected to freezing and thawing cycling and has humidity at the requiredmoisture content for testing; the initial state sample and the test sample are both subjected to geometric parameter measurement and ultrasonic wave velocity test, the volume deformation rate of thetest sample and the longitudinal wave velocity of the test sample and the initial state sample are obtained, the longitudinal wave velocity, the moisture content and the volume deformation rate of thetest sample are measured according to the longitudinal wave velocity and moisture content of the initial state sample, and the damage variable of the test sample is calculated. Therefore, with the method, the damage degree of soil can be evaluated accurately, comprehensively and non-destructively and the damage mechanism can be reflected without destructive tests.

The invention specifically relates to a spectral linear expression-based oil property prediction method. The method comprises the steps of analyzing main components of near infrared spectral data of acorrection set and a test sample, extracting first k main components in a scoring matrix obtained in main component analysis and creating a main component space, finding out, based on Euclidean distance in the main component space, oil samples most similar to the test sample in n correction sets, and taking the oil samples as adjacent samples; calculating near infrared spectral weights w of the adjacent samples; and weighting property values of the adjacent samples by using the near infrared spectral weights w, so as to obtain a predicted property value of the test sample. The test sample ispredicted through linear combinations with specific weights, and the method integrates advantages of a parameter model and a non-parameter model.

The invention discloses a track circuit fault automatic diagnosis method based on a deep convolutional neural network, and the method comprises the steps: firstly obtaining the real-time change data of a track circuit, building a track circuit fault type data set, and dividing the data set into a training sample and a test sample; secondly, establishing a one-dimensional deep convolutional neuralnetwork, inputting the training set sample to train a network model, and evaluating the accuracy of the network model through a test sample to obtain a trained one-dimensional deep convolutional neural network model; and finally, inputting the real-time change data of the track circuit into the trained deep convolutional neural network model, establishing a mapping relationship between input and output through a neural network, outputting a fault type, and positioning a fault position. According to the method, the fault diagnosis efficiency and accuracy of the track circuit can be improved, field maintenance personnel can quickly process faults, and the maintenance and repair efficiency and the intelligent level of the track circuit are improved.

The invention provides a gradient shimming method for overcoming the convection effect on a nuclear magnetic resonance spectrometer, and relates to the nuclear magnetic resonance spectrometer. The gradient shimming method for overcoming the convection effect on the nuclear magnetic resonance spectrometer can overcome the convection effect inside a sample. The gradient shimming method comprises the following steps: step 1, a field graph of a shim coil is prepared in advance; step 2, the impulse sequence of a gradient module which comprises compensation convection in the direction of frequency coding is used, or the impulse sequence of a gradient shimming is used, but the temperature difference inside the sample is reduced; step 3, the impulse sequence is used for conducting two times of imaging sampling, sampling data are obtained, after the data are processed, the electric current variation of the shim coil which needs modulation is calculated through fitting, and hardware is led in; step 4, shimming iteration convergence condition judgment is conducted, and the step 3 and the step 4 are repeated if the convergence is not conducted. According to the gradient shimming method for overcoming the convection effect on the nuclear magnetic resonance spectrometer, the gradient module which comprises the compensation convection in the direction of frequency coding is used in the impulse sequence, or temperature control airflow is adjusted at the time of the gradient shimming so as to reduce the temperature difference inside the tested sample as much as possible, and therefore the effect of the convection effect on the gradient shimming is compensated or reduced.

The invention provides an additive material high throughput test sample preparation method, a representation platform and a representation experiment method. The method comprises the steps: receivingdesign data of a high throughput test sample, wherein the design data at least contains gauge length sections of design test samples; conveying a plurality of design test samples to the set positionsaccording to the set movement speed, wherein each design test sample contains an appointed element material; at the set positions, utilizing a heat source to sinter the design test sample to obtain high throughput test samples, wherein in a sintering process, all the gauge length sections of the design test samples correspond to appointed heat source powder. By means of the method, measurement data of different kinds of additive materials can be simultaneously obtained; thus, the work amounts and time of experiments are reduced, and quick screening and optimization on additive manufacturing materials are improved.

A testing method for ultra-high bonding strength of a coating mainly aims at testing for the bonding strength of the sprayed coating. The testing method comprises the steps that (1) the to-be-tested coating is sprayed on a cylindrical base body with a thread to form a tensile sample; (2) the tensile sample is machined through a lathe, and thus the diameter of the interface between the to-be-testedcoating and the base body becomes small; (3) through the to-be-tested coating on the tensile sample, the machined tensile sample is bonded with a sandblasted duality sample through epoxy resin glue to form a to-be-tested sample, and the bonding position is entwined through high-temperature tape; (4) the to-be-tested sample is put into a heat treatment furnace to solidify the epoxy resin glue; and(5) the to-be-tested sample with the solidified epoxy resin glue is fixed to an electronic universal testing machine through a thread, and the tensile strength of the coating is calculated by measuring the area of the interface between the to-be-tested coating and the base body and recording tensile force. By decreasing the contact area of the coating and the base body, under the same tensile force, the high bonding strength of the coating can be tested; and according to the testing method, operation is easy, and the technology is reliable.

The invention relates to whitening effect evaluation methods, in particular to a whitening effect evaluation method based on small fish embryos. The whitening effect evaluation method includes: addinga to-be-tested sample into incubation liquid to allow the to-be-tested sample to seep into the skin of young fish, taking out the young fish, grinding to obtain tissue homogenate, centrifuging, collecting precipitates, resuspending with an appropriate amount of water, and using osmotic pressure to crush cells to release melanin in the cells to obtain detection liquid; using a microplate reader orspectrophotometer to perform detection, and comparing with blank control not using the to-be-tested sample to evaluate the whitening effect of the to-be-tested sample. The whitening effect evaluationmethod has the advantages that the method is used to evaluate positive chemical compounds such as alpha-arbutin, and the result shows that the method can quantitatively evaluate the in-vivo whiteningeffect of the alpha-arbutin, and the in-vivo whitening effect of the alpha-arbutin is evidently dose-dependent; the method is capable of quantitatively evaluating the whitening effect at overall animal level, short in experimental period, low in cost, capable of performing in-vivo toxicity evaluation at the same time and applicable to the large-scale screening and development of the whitening rawmaterials of cosmetics.

The invention discloses a method for analyzing the mechanical properties of 3D printing samples with different construction orientations, which comprises the following steps of manufacturing a plurality of test sample strips with different construction orientations by adopting 3D printing, and arranging speckles on the surfaces of the test sample strips, placing the test sample strip on a loadingdevice, and debugging the loading device, carrying out a mechanical property detection test, and collecting an image of the test sample strip in the whole test process, performing contrastive analysison the images before and after the deformation of the test sample strip by using a digital image correlation method to obtain pixel point displacement and strain information, according to the straininformation, acquiring a stress-strain curve to obtain performance parameters of the test sample strip, repeating the above steps to complete the mechanical property detection test of the test samplestrips with different construction orientations, and analyzing the difference of the mechanical properties of the test sample strips with different construction orientations.

The invention provides a method for constructing an HPLC fingerprint of Pudilan Xiaoyan Tablets based on detection wavelength switching. The method absorbs Pudilan Xiaoyan Tablets, injects the test sample solution into a liquid chromatograph for high performance liquid chromatography analysis, and generates a standard fingerprint of the Pudilan Xiaoyan Tablets by using an average method through multi-point calibration and full spectrum peak matching, wherein the detection wavelength in the chromatographic conditions is 0-10min 323nm, 10-40min 280nm. The method provided by the invention provides a standard fingerprint of Pudilan Xiaoyan tablets and carries out quality analysis and evaluation through the similarity evaluation of the listed samples, has the advantages of simple operation highrepeatability, precision and stability, and can comprehensively and accurately evaluate the process rationality and product uniformity of the Pudilan Xiaoyan Tablets.

The invention discloses a dielectric constant measuring jig and method based on a parallel plate capacitance method, and belongs to the technical field of material measurement application. The measuring jig comprises an electrode system, a sliding frame system, a thickness measuring system and a base plate. The electrode system comprises an upper pole plate, a lower pole plate, a supporting columnand a triangular bracket. The sliding frame system comprises a rotating hand wheel, a ball screw, a sliding rail and a sliding block, the rotating hand wheel is connected with the ball screw, the sliding block moves on the sliding rail, the upper pole plate of the electrode system is fixed on the sliding block, and the rotating hand wheel controls the sliding block to move and drives the upper pole plate to move. The thickness measuring system is used for measuring the relative displacement of the upper pole plate along with the movement of the sliding block. A measured sample is placed between the upper pole plate and the lower pole plate, and the dielectric constant of the sample is calculated by utilizing the read capacitance value of a parallel plate capacitor, so that the fringe effect is reduced, the precision of a measurement result is improved, and the requirements of test samples with different sizes are met.

The invention discloses a method for optimizing casting cooling process parameters of an aluminum alloy steering gear valve shell. The method comprises the following steps: (1) establishing a pouring system numerical model and a defect prediction model in the casting forming process of the aluminum alloy steering gear valve shell as an optimization object; (2) selecting a plurality of cooling system process parameters as optimization variables, determining a design space and an optimization target, and extracting test sample points by adopting a Latin hypercube test design method; (3) introducing a test design sample into the numerical model for analog simulation to obtain a target value of the defect volume of the steering gear valve shell, establishing a nonlinear approximation model reflecting the relationship between input and output by adopting a Kriging interpolation method, and evaluating the reliability of the model; and (4) according to the Kriging model, obtaining a steering gear valve shell cooling process parameter combination with the minimum defect volume, substituting an optimization result into the gating system numerical model and the defect prediction model for analysis, and verifying the cooling system process parameters until the optimal process parameters are obtained.

The invention discloses an ephedra-perilla leaf cough relieving capsule fingerprint detection method and an application thereof. The ephedra-perilla leaf cough relieving capsule fingerprint detectionmethod comprises the steps of: (1) preparation of a test sample solution; (2) determination of HPLC chromatographic conditions; (3) determination of an HPLC spectrum; and (4) establishment of a standard fingerprint, so as to obtain an ephedra-perilla leaf cough relieving capsule fingerprint. The ephedra-perilla leaf cough relieving capsule fingerprint detection method can be used for quality control of ephedra-perilla leaf cough relieving capsules.

The invention discloses a metallographical test piece polishing clamp. The metallographical test piece polishing clamp comprises a cross-shaped fixing support module, a protection cover module, a liquid dropping module and a test sample clamping module, wherein the protection cover module, the liquid dropping module and the test sample clamping module are connected with the cross-shaped fixing support module. The metallographical test piece polishing clamp is simple in product structure and convenient to operate, the clamp and devices for fixing the clamp are arranged, the design of a clamping screw enables the clamp to be used more flexibly, the clamping condition of the clamp can be adjusted in time according to the shape sizes and the stress conditions of test samples, and the polishing accuracy is adjusted. According to the product, the multiple test samples can be polished at the same time, the manufacturing efficiency of metallographical samples is improved, other resources do not need to be consumed, and therefore the metallographical polishing process is easy, rapid and convenient. A guide rail support is adopted, and the position of the test sample clamping device can be freely adjusted in the guide rail direction, so that any-position movement of the test samples on a polishing disc is achieved, and the requirement for polishing is met.

The invention relates to a high-temperature bending fatigue in-situ test device and method. The device is composed of an electromagnetic resonance loading module, a hydraulic loading module, a high-temperature loading module, an in-situ monitoring module and a sample clamping device. The electromagnetic resonance loading module can realize high-frequency bending fatigue loading of a tested sample;the hydraulic loading module can realize low-frequency bending fatigue loading of the tested sample; the high-temperature loading module can realize loading of a tested sample in high-temperature andvariable-temperature environments; the in-situ monitoring module can monitor the characteristics and mechanisms of crack initiation and propagation of the sample; and the sample clamping device can realize firm clamping and accurate positioning of tested samples with different sizes and different shapes. The device and the method can be used for high-resolution in-situ test of high-temperature bending fatigue performance, and provide a feasible technical means for material bending fatigue performance test and service safety guarantee in the fields of aerospace, automobile manufacturing, railtransit and the like.

The invention relates to the biological detection field, discloses a colloidal gold rapid-testing card and kit for detecting vomitoxin and a method for detecting the vomitoxin and particularly discloses the colloidal gold rapid-testing card for detecting the vomitoxin. The colloidal gold rapid-testing card comprises a sample feeding region, a conjugate region, an observation region and a water suction region which are sequentially arrayed on a base plate. The invention further discloses the method for detecting the vomitoxin. The method comprises the steps of carrying out pretreatment on a to-be-tested sample so as to obtain a vomitoxin extract, detecting the vomitoxin extract by virtue of the colloidal gold rapid-testing card, and carrying out result analysis. The invention simultaneouslydiscloses the kit for detecting the vomitoxin. The kit is characterized by comprising the colloidal gold rapid-testing card and a water bottle filled with purified water. According to the colloidal gold rapid-testing card, the detection sensitivity, specificity and precision can be rapidly improved.

The present application discloses a platform leveling control method, including: acquiring the white light interference fringe pattern of the sample under test, extracting the white light interference fringe pattern according to the white light interference fringe pattern; obtaining the tilt of the measured sample according to the white light interference fringe pattern The orientation angle and the yaw angle; calculate the offset displacement parameter of the platform according to the orientation angle and the yaw angle, and adjust the driving device of the platform according to the offset displacement parameter. The application can calculate the displacement offset feedback of the platform according to the white light interference fringe pattern, and control the driving device of the platform to automatically level the platform, which can replace manual leveling of the platform.

The invention relates to a gas chromatography-mass spectrometry analysis method for a determinating potassium cinnamate content in food. The gas chromatography-mass spectrometry analysis method comprises the following steps: (1), weighing a sample, putting the sample into a container, adding water till a constant volume, adding acid to adjust the pH of a sample solution to 1, then extracting the sample solution by using dichloromethane, collecting an extracted dichloromethane layer, and drying; (2), derivatizing and extracting the sample: adding a derivatizing reagent into the dried sample inthe step (1), swirling for uniformly mixing, carrying out a reaction in a water bath, then cooling to room temperature, adding n-hexane for extraction, allowing standing still and then taking a supernatant as a test sample solution; (3), determinating: determinating the potassium cinnamate in the test sample solution obtained in the step (2) by a gas chromatography-mass spectrometry technology. Inthe gas chromatography-mass spectrometry analysis method, pretreatment operation is simplified; in addition, by the gas chromatography-mass spectrometry analysis method, the anti-interference abilityis good, the precision is high, the reproducibility is good and qualitative accuracy is good; the gas chromatography-mass spectrometry analysis method can be widely applied to determination of the potassium cinnamate in the food.

The fast constant-current test method for the electrochemical performance of magnesium-base anode includes the following steps: preparing test sample and anode test electrolyte reagent; setting them inside cathode test crucible; connecting to the test circuit to test the closed circuit potential of the test sample in the test period; measuring the open-circuit potential of the test sample after test; reporting and calculating the total electric capacity via the loop during test period based on the formula; reporting and calculating the practical electric capacity obtained corresponding to unit mass loss of the test sample based on the formula; and comparing and analyzing to obtain determined electrochemical performance parameter. The test method is fast, accurate and efficient.

The invention provides a method for evaluating the quality of sperm obtaining energy in vitro. The method specifically includes the following steps of A, collecting a fresh liquefied sperm specimen, washing sperm with a phosphate buffer or a BWW culture solution, sufficiently removing residual seminal plasma components, and separating out sperm in a centrifugal mode; B, adding the BWW culture solution to sperm separated out in the step A, obtaining upstream sperm through an upstream method, counting the number of sperm, incubating sperm for 3-4 hours in a CO2 cell culture box with 5% of in-vitro energy obtaining liquid, conducting centrifugal separation on the obtained supernate, and collecting supernate as a to-be-tested sample; C, measuring the activity of neuraminidase in sperm energy obtaining liquid, and finally obtaining the value of neuraminidase activity/sperm number to evaluate the quality of sperm. By detecting the activity of neuraminidase in sperm in-vitro energy obtaining liquid, diagnosis basis and clinical queries are provided for male infertility patients of unknown clinical reasons.