Preparation method of high-purity boron trifluoride-11

The invention discloses a preparation method of high-purity boron trifluoride-11, belonging to the field of boron isotope compounds. The preparation method comprises the following steps: (i) pretreating reactants; (ii) fluorinating boron oxide-11 to synthesize a boron trifluoride-11 crude product; (iii) carrying out primary separation on the boron trifluoride-11 and impurities; (iv) liquefying and collecting the boron trifluoride-11; (v) purifying the boron trifluoride-11; and (vi) treating tail gas. The enriched boron-11 isotope boron oxide-11 used as the raw material reacts with the fluorinating agent high-purity nitrogen trifluoride to synthesize the boron trifluoride-11; and the obtained product is subjected to adsorption and low-temperature rectification to remove trace impurities, thereby obtaining the enriched boron-11 isotope high-purity boron trifluoride-11 product with the purity of 99.999%. The high-purity boron trifluoride-11 product can satisfy the requirements for the advanced ...

Portable two-channel vibrating functional failure diagnostic apparatus

Blog division method and system based on sub-waveform relation extraction

The invention provides a heart beat division method and system based on sub-waveform relation extraction, and relates to the technical field of electrocardiosignal processing. The method comprises the steps that 12-lead electrocardiosignal data tensor and annotation data are obtained and preprocessed, and then electrocardiosignals and a heart beat division label matrix are obtained; inputting the electrocardiosignal into a deep learning network to obtain an alignment feature, and adding an electrocardiosignal sequence position code to the alignment feature to obtain a new alignment feature; generating a sub-waveform feature extraction matrix by marking the waveform type of the sub-waveform in the data, combining the sub-waveform feature extraction matrix with the new alignment feature, and performing dimension change sorting to obtain a feature tensor based on the sub-waveform; sub-waveform time sequence features are extracted from the feature tensor based on the sub-waveforms, then a sub-waveform ...

Vehicle environment based on two eyes visual and distance measuring system

Preparation method of boron-11 acid with high abundance

The invention discloses a preparation method of boron-11 acid with high abundance, belonging to the field of boron compounds. The preparation method comprises the steps of purifying a raw material, i.e., boron fluoride-11 with high abundance; hydrolyzing boron trifluoride-11; filtering to remove sediments; purifying through ion exchange; crystallizing; filtering to remove a mother liquid; and drying and the like. The boron-11 acid with high abundance, prepared by using the preparation method, is high in purity up to more than 99.9% and can be used as a raw material for preparing compounds related to an isotope of concentrated boron-11. A series of boron-11 acids prepared by using the boron-11 acid with high abundance as the raw material can be used as a doping source of an isotope of boron-11 for preparing semiconductors, and the manufactured semiconductor device has excellent interference and radiation resistance.

Preparation method of high-purity boron trichloride-11

The invention discloses a preparation method of high-purity boron trichloride-11, and belongs to the field of preparation methods of boron compounds. The preparation method comprises the steps such as pretreating raw materials, synthesizing boron trichloride-11 through reaction of aluminum chloride and boron trifluoride-11, filtering, preliminarily separating, rectifying and purifying, collecting the high-purity boron trichloride-11 product, treating tail gas, and the like. The high-purity boron trichloride-11 prepared by the preparation method disclosed by the invention is high in purity which can reach over 99.9999%, can satisfy requirements of manufacturing integrated circuit semiconductor apparatuses on a large scale, effectively improves interference resistance and radiation resistance of an integrated circuit, and can be used as the raw material for manufacturing raw materials such as a high-purity boron-11 isotope material, a special boron fiber material and light-guide fiber.

Lung cavity aeration liquid and its preparation method

The invention relates to a lung cavity venting liquid whose main composition is fluorine decahydronaphthalene, its boiling point is 140-142 deg. C, its specific density is above 1.9. The invention realizes a major tool for liquid venting, which can increase lung compliance substantially.

ECG waveform clustering method and system based on spectral space representation learning

The invention provides an ECG waveform clustering method and system based on spectral space representation learning, and relates to the technical field of ECG waveform clustering. Multi-lead electrocardiogram data are obtained, and a training data set composed of the multi-lead electrocardiogram data and heart beat sub-lead spectral space relative characteristics is constructed; training the constructed feature extraction model based on the training data set, and learning spectral space representation; inputting the multi-lead electrocardiogram data to be clustered into the trained feature extraction model to obtain the partial lead absolute features of the heart beat; clustering the partial lead absolute features of the heart beat to obtain a clustering result of the heart beat; according to the method, the neural network is used for learning the relative features of the spectral space center beat, the waveforms are clustered, the improvement of the feature expression quality is focused ...

Micro-arc oxidation composite coating doped with fluorinated graphene and preparation method of micro-arc oxidation composite coating

The invention discloses a fluorinated graphene doped micro-arc oxidation composite coating and a preparation method thereof.The preparation method comprises the steps that fluorinated graphene is added into a strong alkali solution to be subjected to ultrasonic treatment, then deionized water is used for centrifugal cleaning for at least two times, then the fluorinated graphene is added into a mixed solution of a dispersing agent and the deionized water to be subjected to ultrasonic stirring, and the fluorinated graphene doped micro-arc oxidation composite coating is obtained; a mixed solution containing the modified fluorinated graphene is obtained; sodium silicate nonahydrate, potassium hydroxide and potassium fluoride are sequentially dissolved in deionized water, then the mixed solution containing the modified fluorinated graphene is added, and the electrolyte is prepared after even mixing; and a magnesium alloy workpiece subjected to pretreatment is placed in the electrolyte and serves ...

Production process and smelting equipment of lithium-boron alloy strip

The invention relates to the technical field of lithium-boron alloy strip production, in particular to a production process and smelting equipment of a lithium-boron alloy strip, in the production process of the lithium-boron alloy strip, raw materials comprise, by mass, 20%-50% of boron powder, 0.2%-1% of lithium carbide powder, 50%-80% of lithium and 2%-6% of magnesium, and the production process of the lithium-boron alloy strip comprises the specific steps that (1) the boron powder and the lithium carbide powder are mixed, subjected to ball milling and preheated; (2) melting lithium and magnesium at 400 DEG C, raising the temperature to 440-460 DEG C, adding the preheated mixed powder into a lithium-magnesium melt, and continuously stirring until the melt becomes sticky; (4) completely pouring the melt into a curing crucible preheated in advance, raising the temperature to 500-560 DEG C, preserving the heat until the melt is completely cured to obtain a lithium-boron alloy block, stopping ...

Preparation method of high-purity boron-11

The invention discloses a preparation method of high-purity boron-11, which belongs to preparation methods of the isotope materials of boron. The preparation method comprises the following steps of: (i) reactor pre-treatment; (ii) reduction reaction between boron trihalide-11 gas and hydrogen; (iii) product separation; and (iv) tail gas recovery treatment. The invention provides a preparation method of high-purity boron-11, wherein the high-purity abundant boron-11 prepared by the method disclosed by the invention is capable of meeting the special requirements of super-large-scale integration circuit manufacture procedures on a doping source boron-11, and the high-purity abundant boron-11 has an important application prospect in the fields of aerospace alloy materials, nuclear energy materials, light-guide fibres and artificial polycrystalline diamond.

Combined processing system and method for heart beat division and classification

The invention provides a heart beat division and classification combined processing system and method, and the system comprises a data obtaining unit which is used for obtaining to-be-predicted electrocardio data, and obtaining an electrocardio waveform tensor and a corresponding sub-waveform position tensor after corresponding preprocessing; the feature extraction unit is used for processing the electrocardio waveform tensor by using a pre-trained feature extraction network model to obtain electrocardio alignment joint features; the heart beat division unit is used for carrying out feature extraction according to the sub-waveform position tensor on the basis of division features in the electrocardio alignment joint features, and obtaining a heart beat division result through a Viterbi decoding algorithm after mask processing; and the heart beat classification unit is used for obtaining a heart beat classification result according to the sub-waveform position tensor and a heart beat division ...

Method for evaluating working state of hydraulic support

The invention relates to a method for evaluating the working state of a hydraulic support, and belongs to the technical field of coal mine intellectualization. Comprising the steps of obtaining pressure, inclination angle and displacement initial data on a hydraulic support top plate; filtering the pressure, inclination angle and displacement initial data to obtain pressure, inclination angle and displacement sample data; performing primary fusion on the pressure sample data, the inclination angle sample data and the displacement sample data by adopting a pre-trained BP neural network to obtain pressure sample data, inclination angle sample data and displacement sample data after primary fusion; according to the pressure, inclination angle and displacement sample data after primary fusion and a preset fuzzy comprehensive evaluation model, a working state comprehensive score of the hydraulic support is determined; and evaluating the working state of the hydraulic support according to the ...

Automatic diagnosis report quality control system and method based on static electrocardiogram measurement parameters

The invention provides an automatic diagnosis report quality control system and method based on static electrocardiogram measurement parameters, and the method comprises the steps: dividing a diagnosis result in an automatic diagnosis report into a plurality of diagnosis terms according to a preset rule, and constructing a to-be-quality-controlled diagnosis term set; traversing each diagnosis term in the diagnosis term set to be subjected to quality control, and executing a quality control process of the diagnosis terms: judging whether a static electrocardiogram measurement parameter value corresponding to the current diagnosis term is in a corresponding parameter range or not according to a quality control library, and if not, deleting the current diagnosis term from a diagnosis result; if yes, further determining the current diagnostic terms based on the static electrocardiogram measurement parameter values corresponding to the current diagnostic terms, obtaining certain diagnostic terms ...

Portable two-channel vibrating functional failure diagnostic apparatus

The present invention discloses a portable double-channel vibration fault diagnosis device, which comprises a casing, a dual core OMAP5912 processor, and a measurement and control system. (A) The present invention adopts double channels to collect vibration signals in real time, thus the real time calibration function of the device for the dynamic balance parameter of the equipment being measured is increased effectively; (B) the present invention adopts two way mutually independent signal conditioning way to operate the multistep program control, the amplification, and the anti-alias filter for the data information collected by double channels, the detecting sensitivity of the system input signal is effectively adjusted; (C) the present invention adopts the dual core OMAP5912 processor, wherein an ARM core operates an embedded Linux operating system, and operates the mixed programme of the C language and the ARM assemble language; a DSP core operates the mixed programme of the C language ...

Imbricated battery string packaging box

The utility model discloses an imbricated battery string packaging box which comprises a battery string box and a string box packaging box body, and the battery string box body is arranged in the string box packaging box body. Each battery string box comprises a box body and a containing cavity used for containing imbricate battery strings, a groove is formed in the top face of each box body, a protrusion is arranged at the bottom of each box body, and the protrusions and the grooves of every two adjacent battery string boxes are connected in a clamped mode. And a cutting groove is formed in the inner corner of the box body, so that the outer corner of the battery string is not in contact with the battery string box. By implementing the utility model, the damage of the imbricated battery string in the transportation process can be effectively reduced.

Self-supervised electrocardiosignal to noise ratio evaluation method and system

The invention belongs to the technical field of electrocardiosignal processing, and provides a self-supervised electrocardiosignal to noise ratio evaluation method and system for noise in an electrocardiosignal frequency band. The method comprises the following steps: calculating upper and lower envelopes of original electrocardio data and composite noise, calculating an amplitude difference of the envelopes, and calculating a signal-to-noise ratio of a composite waveform through a signal-to-noise ratio formula; and inputting the composite electrocardiogram data into a network, calculating loss after obtaining a result, updating network parameters through an optimization algorithm until the result reaches an expectation, and judging whether a noise segment in an electrocardiogram can influence a result of a subsequent electrocardiogram automatic analysis algorithm or not according to the magnitude of a signal-to-noise ratio. According to the method, the self-supervision characteristic is ...

Preparation method of high-purity boron tribromide-11

The invention in particular discloses a preparation method of high-purity boron tribromide-11, belonging to the field of preparation methods of borides. The preparation method comprises the steps of pre-treatment, reactive synthesis, primary separation of impurities in a coarse product, rectifying purification, collection of a high-purity boron tribromide-11 product, tail gas treatment and the like. High-purity boron tribromide-11 prepared by the preparation method has high purity above 99.9999% and high abundance above 99% and can meet the requirements of super-large-scale integrated circuit semiconductor device processes for special boron-doped sources.

Preparation method of high-purity deuterated ammonia

The invention discloses a preparation method of high-purity deuterated ammonia, belonging to the field of preparation of hydrogen isotope deuterium compounds. The preparation method comprises the following steps: (i) pretreating a reactor; (ii) reacting deuterium gas with nitrogen gas; (iii) liquefying and separating a deuterated ammonia crude product; (iv) purifying the deuterated ammonia; and (v) treating tail gas. Since the deuterated ammonia synthesized by the method directly adopts the high-purity raw material, no other byproduct is generated in the reaction process, and the method has the advantages of single product, fewer impurities and simple product purification technique and equipment, and is easy to operate. The high-purity deuterated ammonia can be used for a very-large-scale integrated circuit manufacturing technique, and can effectively enhance the performance of semiconductor devices.

Electrocardio baseline recognition method and system independent of data annotation

The invention discloses an electrocardio baseline recognition method and system independent of data annotation, and relates to the technical field of electrocardio signal processing. Firstly, three forms of simulated baseline drift noise are automatically generated, the position of a baseline does not need to be manually marked, and then the anti-noise capability in model training and the fitness of the generated baseline are improved through six noise reduction and data enhancement methods such as median design and wavelet reconstruction by using original electrocardio noise. The method comprises the following steps of: acquiring an electrocardiosignal, then inputting the electrocardiosignal into a baseline recognition network, extracting noise features by utilizing multi-scale convolution, an SE module and a recurrent neural network, finally obtaining an output baseline recognition result, and subtracting the baseline recognition result from original data to obtain the electrocardiosignal ...

Subwaveform identification method and system applied to electrocardiogram

The invention provides a sub-waveform recognition method and system applied to an electrocardiogram, and relates to the field of waveform recognition. Electrocardiographic wave data are preprocessed to obtain a training data set, and a sub-waveform recognition model is trained; reasoning the training data set to obtain a feature vector of the electrocardiograph, and performing global optimal search on the feature threshold of each sub-waveform based on a particle swarm algorithm to obtain the optimal threshold of each sub-waveform; inputting electrocardiograph data to be recognized into the sub-waveform recognition model to obtain a feature vector of the electrocardiograph; decoding the feature vector of the electrocardiograph to obtain the category and the position of the sub-waveform; according to the method, the full convolution technology is applied to provide a sub-waveform recognition model, the model obtains a sensing field meeting actual medical requirements through the characteristics ...

Preparation method of pulmonic cavity ventilating liquid

The invention discloses a preparation method of perfluorinated octane. The method includes the following steps: (1) filling a reactor with a catalyst, and carrying out fluoridation treatment with a fluridizer at high temperature; (2) adding octane into a vaporizer to obtain an octane steam, and controlling the vaporizer temperature between 100-150 DEG C; (3) introducing inert gas into the vaporizer, diluting the octane steam, and continuously introducing the octane steam diluted mixed gas into the reactor to carry out a fluoridation substitution reaction with the fluridizer; and (4) carrying out alkali washing, water washing and rectifying purification on the reaction product, to obtain the perfluorinated octane. The perfluorinated octane obtained by the preparation method disclosed by the invention can be used as a pulmonic cavity ventilating liquid or used in manufacture of ophthalmic surgical instruments.

Preparation method of high-purity pentafluoropentanol

The invention relates to the technical field of pentafluoropentanol synthesis, in particular to a preparation method of high-purity pentafluoropentanol, which comprises the following steps: (1) taking propionyl chloride as a raw material, and carrying out electrolytic fluorination reaction to generate perfluoropropionyl fluoride; (2) reacting perfluoropropionyl fluoride with sodium borohydride and methanol to generate 2, 2, 3, 3, 3-pentafluoropropanol; (3) the 2, 2, 3, 3, 3-pentafluoropropanol and phosphorus tribromide are subjected to a substitution reaction, and 1-bromo-2, 2, 3, 3, 3-pentafluoropropane is generated; and (4) reacting the 1-bromo-2, 2, 3, 3, 3-pentafluoropropane with magnesium powder to generate a Grignard reagent, reacting with ethylene oxide to generate a pentafluoropentanol crude product, and rectifying to obtain the high-purity pentafluoropentanol. Compared with the prior art, the method is milder in reaction and higher in safety, reduces generation of waste, avoids ...