276results about How to "Small standard deviation" patented technology

The invention discloses a distributed water depth prediction method based on GWR (geographically weighted regression) and a BP (back propagation) neural network. The method comprises the following steps: firstly, preprocessing a remote sensing image; secondly, establishing sampling data based on an actually measured water depth value acquired by a laser radar and DN (digital number) values of blue and green wavebands of corresponding coordinate points in the remote sensing image; thirdly, dividing a to-be-predicted region into a plurality of sub-regions based on the GRW method and establishing a neural network water depth predication model of each sub-region; finally, designing weighting factors of the neural network water depth prediction models of all regions around each to-be-predicted point in the to-be-predicted region to establish a distributed neutral network water depth prediction model of the whole to-be-predicted region. Therefore, the distributed water depth prediction method is not influenced by seawater quality, seabed type or space diversity, can quickly and conveniently establish a nonlinear relationship between the multispectral remote sensing image and the actual water depth value, and has a very good practical value for prediction of shallow water depth.

This invention relates to a method for dyeing polymer microspheres to obtain fluorescent polymer microspheres. The method comprises: uniformly mixing fluorescein 0.01-80%, polymer microspheres 0.1-80%, emulsifier 0-10%, tackifier 0-10%, and solvent (one or more of good solvents and poor solvents) 18.9-99.89%, dyeing under 1-101 kPa in dark for 1-720 h, taking out the dyed polymer microspheres, and washing repeatedly. The obtained fluorescent polymer microspheres have such advantages as simple process, high fluorescent brightness, wide fluorescent spectrum range, uniform particle size distribution and low relative standard deviation, and can be used as absolute counting microspheres of flow cytometry, fluoroimmunoassay microspheres, biosensor, microfluidic chip, and calibrator of fluorescence microscope.

The invention belongs to the technical field of detection of enrichment of remained antibiotics in a water body environment, and particularly relates to a synchronous detection method of tetracyclines, fluoroquinolones and sulfonamide antibiotics remained in the water body. The detection method comprises the following steps: (1) performing water sample pretreatment; (2) performing small-column enrichment of target antibiotics by using solid-phase extraction; (3) detecting on a machine by using high performance liquid chromatography and tandem mass spectrum. According to the method, once the sample feeding is carried out at one time, multiple antibiotics in the water body can be detected at the same time, the time consumption of a detection process is reduced, the detection accuracy and sensitivity are increased, the detection limit is low, and the condition of the trace amount of remained antibiotics in the water body environment can be detected; meanwhile, the detection method is convenient to operate and low in environment toxicity and is low in using amount of organic reagents.

The invention discloses a spectrophotometric method for determining the ammonia nitrogen content in water. The method comprises the steps that: (1) an original water sample requiring analyzing is fetched; (2) pre-treatment of the original water sample is carried out, wherein residual chlorine is removed, suspended solids are removed by filtration, and a masking agent which is potassium sodium tartrate is added for eliminating the interference of magnesium ions; (3) the absorbance of the water sample is tested by using a spectrophotometer; (4) a blank test is carried out by using distilled water, such that a blank absorbance is obtained; and (5) the blank absorbance obtained in the steps (4) is subtracted from the absorbance obtained in the step (3), such that a corrected absorbance is obtained; a standard curve is drawn, and the ammonia nitrogen content in water is calculated. The method provided by the invention is advantaged in that: with the method provided by the invention, the ammonia nitrogen content in water can be rapidly and conveniently tested. Through the pre-treatment upon the original water sample, interferences of the suspended solids, the residual chlorine, the calcium ions and the magnesium ions upon testing results can be avoided, and the accuracy of testing results can be effectively improved. The method is also advantaged in good repeatability and low relative standard partial.

The invention discloses a method for improving the denitration rate of an SCR (Selective Catalytic Reduction) denitration system of a power station boiler. The method comprises the following steps: (1) measuring concentration distribution of NOx at the outlet of an SCR denitration reactor; (2) calculating the unevenness Cv of concentration distribution of NOx according to the measuring result in the step (1); (3) when Cv is greater than 20%, adjusting the valve opening in an area corresponding to an ammonia injection grid according to the concentration distribution of NOx at the outlet of the SCR denitration reactor; (4) repeating the steps (1) to (3) until Cv is less than or equal to 20%. Through optimization and adjustment by the invention, the evenness of distribution of NOx at the outlet of the SCR denitration reactor is remarkably improved, and the relative standard deviation of NOx is reduced from 46.4% to 14.8%. On the premise of ensuring that ammonia escape does not exceed standard, the denitration rate is improved from 77% to 83%. The method disclosed by the invention has important guiding meaning and engineering application value to safe, efficient and stable operation of the SCR denitration system of the power station boiler.

The invention discloses a hydrobiontic algae chlorophyll measuring method which consists of, using spectrophotometry method to measure the algae chlorophyll content in the water, filtering subaqueous algae with cellulose acetate microporous filtering film, carrying out interception to the algae cellulose acetate through immersion with 90% ethanol, extracting the chlorophyll in algae cell into ethanol, centrifuging the tobacco extract to obtain the clarified solution, using 90% ethanol as reference, determining absorbancy of the tobacco extract at 630, 647, 664 and 750 nm with a spectrophotometer, calculating content of chlorophyll a, b, c in the water sample by utilizing the measured data.

The invention relates to a method for detecting characteristic component of usneaceae plant in a tobacco sample. The method comprises the following steps: a) extracting the tobacco sample by an internal standard substance-containing extraction solvent to obtain a sample solution; b) using characteristic component of the usneaceae plant, an internal standard substance and the extraction solvent to prepare the standard solution with a series of concentration; c) using a gas chromatography-mass-spectrography method for determining the characteristic component of the usneaceae plant in the standard solution with a series of concentration, drafting a standard work curve; d) using the gas chromatography-mass-spectrography method to determine the content of the characteristic component of the usneaceae plant in the sample solution, employing an internal standard curve method for quantification; and e) calculating the content of the characteristic of the usneaceae plant in the tobacco sample. The method has the advantages of good repeatability and high analysis detection sensitivity.

The invention discloses a multi-camera measurement method based on a refractive projection model and a beam tracking method, and used for the field of visual detection and image measurement. The process of the present invention comprises the following steps of: building a multi-camera system; global calibrating by multi-camera based on the refractive projection model and the beam tracking method;respectively capturing images from different directions by a plurality of cameras; extracting and matching features to obtain measured three-dimensional points; converting the three-dimensional pointsobtained by each subsystem into the same coordinate system to obtain global measured data; and using the obtained three-dimensional point data to calculate an indirect amount (e.g., strain, displacement). The key of the present invention is the calibration of the multi-camera system, the result will affect the subsequent three-dimensional point acquisition. According to the multi-camera measurement method based on the refractive projection model and the beam tracking method, the features in the measurement process are that the multiple cameras in the system can be calibrated at the same timeto solve the problem that a planar calibration plate limits the distribution of multiple cameras, and the measurement process is flexible.

The invention provides am MRAM chip. The MRAM chip comprises a plurality of array groups, wherein each array group comprises m arrays; m bits in a word are respectively stored in the m arrays; and each array comprises a low-resistance state reference resistor column and a high-resistance state reference resistor column. The invention furthermore provides a storage unit reading method. According tothe MRAM chip and the storage unit reading method, the m bits of the word are respectively stored in the m arrays, and reference resistors are arranged in arrays which only comprise one bit, respectively, so that the number of storage units which share a same reference resistor is decreased, the standard difference is decreased, and the problem of high reading error rate caused by relatively small signal difference is avoided; each array only comprises two columns of reference resistors, so that the numbers of the reference resistors and the storage units are relatively small, and the numberof effective storage units in a unit area can be increased; and by adopting cross stepwise superposition to obtain signals and adjust weights, the reference resistors can have optimum values and the reading error probability is decreased.

The invention relates to a softening-point-test-based regenerant diffusion effect detection method. The method comprises the following steps of: putting a softening point sample ring onto a glass baseboard coated with a glycerinum talcum powder separant; preparing a pitch sample; cooling the pitch sample for 30 minutes at room temperature, and then slicking the pitch sample; putting the pitch sample and the glass baseboard into a container together, and pouring the regenerant into the container, wherein the liquid level of the regenerant is higher than the surface of the sample by about 1mm; warming the container in a constant temperature oven for different time of t; taking the container out of the oven, simultaneously, taking the pitch sample and the glass baseboard out of the container, cooling the pitch sample and the glass baseboard for 30 minutes at room temperature, slicking the pitch sample with a scraper, and erasing the regenerant around the sample ring; carrying out a softening point test, thus obtaining the softening point value R of the sample, corresponding to different thermal insulation time t; and carrying out data fitting according to a equation form of R=A*t+B, thus obtaining the evaluation index A of the diffusion effect of the regenerant. According to the regenerant diffusion effect detection method, the evaluation on the diffusion effect of the regenerant in a thermal regeneration process of a bituminous pavement is effectively realized, so that beneficial basis is offered for improving the performance evaluation as well as comparison and selection of the regenerant.

The invention provides a mold and a method for ring hoop tension tests of small polymer pipes for biodegradable stents and aim to overcome the defects of technologies for the ring hoop tension tests of the small polymer pipes for the biodegradable stents. The mold and the method have the advantages that the ring hoop tension tests can be carried out on the small polymer pipes of the biodegradable stents under the condition that the original performance of the small polymer pipes is kept, accordingly, accurate test data can be acquired, and the test efficiency can be greatly improved.

The invention discloses a specific cutting knife-material of semiconductor material wire (6H-SiC), which comprises the following steps: 1. grinding through cyclone; grading flow; 2. grading water pretreatment; grading finely for overflow; 3. wetting to blend; dehydrating eccentrically; separating; 5. drying through microwave continuously; 6. blending dryly. The invention is compatible with flexibility of black carbofrax, which improves anti-grinding property obviously.

The invention discloses a method for determining colorant in cigarette package materials. The method is as below: preparing methanol, ammonia and water in the volume ratio of 1:1:8 into an extract liquor, crushing the cigarette packaging material sample, mixing well, adding the extract liquor, shaking, extracting, standing, then removing a supernatant, passing the supernatant through an organic phase membrane for liquid phase chromatographic analysis, detecting contents of six colorants including lemon yellow, Allura red, basic orange, cherry red pigment, auramine O and curcumin, conducting qualitative test by retention time combined with compound ultraviolet spectroscopy, and conducting quantification teest by using an external standard method. The invention can simultaneously detect six colorants including lemon yellow, Allura red, basic orange, cherry red pigment, auramine O and curcumin in the cigarette packaging material, can ensure the colorant content in a controllable range, accurately measure the content of various colorants in cigarette packaging material. The method has the advanategs of simple and convenient method, simple treatment, good reproducibility, high recovery rate, high sensitivity of analysis determination, accurate quantification and fast analysis, and is applicable to the analysis and determination of bulk samples.

The invention relates to a method for predicting the region load, which comprises that: a, collecting the history data of region load and randomly generating weight and bias; b, using the weight and bias to calculate out the predicted value of region load, and the difference between predicted value and real output value; c, using iterate formula to calculate out the adjusting value of weight and bias, refreshing weight and bias; d, judging if the iterate times is over preset time, or judging if the difference between predicted value and output value is lower than preset value; if it is lower, using refreshed weight and bias to calculate the predicted value, ending, or else, entering into step b. The invention can improve the predict accuracy with better track property.

The invention belongs to the technical field of freeze-dried food processing, and in particular relates to a freeze-dried original-taste chicken soup and a manufacturing method thereof. The freeze-dried original-taste chicken soup is prepared from the following materials in parts by weight: 50-60 parts of local chicken, 1-2 parts of Chinese-date, 0.5-1 part of medlar, 2-3 parts of ginger, 0.3-0.5 part of pepper, 1.5-2 parts of table salt, 0.1-0.2 part of aginomoto, 0.3-0.5 part of starch and 0.03-0.05 part of carrageenan. The freeze-dried original-taste chicken soup is nutrient-rich, high in food and nutrition value, long in shelf life and convenient to take, and also has an effect of enhancing immunity.

The invention discloses a method for reducing the indoor visible light DCO-OFDM (Orthogonal Frequency Division Multiplexing) system peak-to-average power ratio. A sending end changes wideband subcarriers into a plurality of narrow band sub carriers through M filters; a receiving end recovers the wideband signals through zero forcing detection, M filters and signal overlapping. The system has the advantages that the power utilization rate is high; the nonlinear distortion due to LED can be resisted; the system error rate is reduced; during communication, the indoor normal illumination can be maintained; the human eye uncomfortable feeling due to medium intensity flickering in a single light source system can be favorably avoided.

The invention discloses an image edge detection method based on a Canny algorithm. The method comprises the steps of image smoothing, gradient magnitude calculation, non-maxima suppression, high and low double-threshold processing and the like. The invention provides an image edge detection method and device for a laser radar distance image in combination with an improved loop filter algorithm and an adaptive Canny algorithm. Noise is filtered by using the improved loop filter algorithm, so that information of a slender structure and the like reflecting key characteristics of an image in the image is effectively protected while the noise is suppressed; according to two indicators including an information entropy and a standard deviation, the algorithm has a higher information entropy value and a lower standard deviation; and by intuitively observing the edge detection results of the three algorithms, the algorithm of the invention can filter noise data more effectively and reflect detail information of the image clearly over the other two algorithms.

The invention relates to a method for simultaneous detection of ofloxacin and sarafloxacin in water body. The method mainly comprises the following steps of adjusting a pH value of a water sample to 2-4 by an acid; filtering the water sample to obtain a pretreated water sample; activating an HLB solid-phase extraction column by acetone, methanol and a formic acid aqueous solution containing ammonium acetate successively; adding ultrapure water to keep a resin in the HLB solid phase extraction column in an activated state; passing the water sample through the column; drying the HLB solid-phase extraction column under the protection of nitrogen after enrichment is finished; eluting with an eluent; collecting the eluent; drying under a nitrogen flow; adding acetonitrile to dissolve residual materials for detection; and detecting the concentrations of ofloxacin and sarafloxacin quantitatively. The method is advantageous in that the pretreatment of the water sample is environment-friendly; and the method can be operated easily, has high enrichment coefficient, and can analyze the content of two trace fluoroquinolone antibiotics in a water environment rapidly and accurately.

The invention provides a pretreatment method for detecting pesticide residues in fresh tea leaves. The method comprises the following steps: selecting a dispersing agent which has high adsorptive property on pesticides such as organic chloride and pyrethroid, directly mixing and grinding the dispersing agent with a fresh leaf sample, so that the cell disruption degree of the sample is improved, and the sample is finally uniformly dispersed; obtaining a mixture in a half-dry state and taking the mixture as a filler, feeding the filler in a chromatographic column in which a certain amount of adsorbents and water removal agents are fed in advance, eluting by using a mixed organic solvent, concentrating an eluant, so that the eluant can be directly subjected to instrumental analysis. According to the method, the operations of extraction and purification of the sample are integrated, and loss of the measured substance caused by sample homogenization, precipitation, centrifugation, dissolution, emulsification and concentration is avoided. Moreover, the method is simple and convenient to operate, high in recovery rate, small in solvent consumption and low in analysis cost and is a green and environment-friendly sample pretreatment method.

The present invention relates to a method for detecting the content of petroleum hydrocarbon in fish by infrared spectroscopy. The present invention eliminates impurity disturb by fish saponification step, extraction step and adsorption step to detect petroleum hydrocarbon residual content in the marine lives rapidly and accurately by infrared spectrophotometry. The method of present invention has the characteristics of low detection limit, small relative standard deviation and high precision.