内画勾线笔

Gain attenuation circuit and power amplifier

A gain attenuation circuit that attenuates an input RF signal and transmits the attenuated input RF signal to a power transistor and a power amplifier are provided. The gain attenuation circuit includes: a first diode connected between a first node and ground, the first node being between a port to which the input RF signal is input and a control terminal of the power transistor; a first transistor and a second transistor stacked between the first power supply and ground, and each having a diode connection structure; and a third transistor configured to receive the operating voltage set by the first transistor and the second transistor through a control terminal, and operate the first diode based on the received operating voltage.

Bacillus amyloliquefaciens capable of producing EC hydrolase, urease and protease and application of bacillus amyloliquefaciens

The invention discloses bacillus amyloliquefaciens capable of producing EC hydrolase, urease and protease and application of the bacillus amyloliquefaciens, and belongs to the technical field of microorganisms. The bacillus amyloliquefaciens capable of producing EC hydrolase, urease and protease is obtained from white spirit yeast through primary screening, secondary screening, purification and identification, the Latin name of the bacillus amyloliquefaciens is bacillus amyloliquefaciens, and the preservation number of the bacillus amyloliquefaciens is CGMCC (China General Microbiological Culture Collection Center) No.26459. The strain provided by the invention not only can degrade ethyl carbamate and urea, but also has better protease producing capacity, so that the strain has huge potential when being applied to white spirit and fermented seasonings.

Integrated parking charging system and method in automatic driving environment

The invention provides an integrated parking charging system and method in an automatic driving environment, and relates to the field of electric vehicle charging. Comprising a garage server which is used for obtaining the real-time remaining driving range, the travel distance to be completed, the traffic jam index and the parking time which are fed back by an electric vehicle cloud server, and judging whether the electric vehicles have charging requirements or not and whether the electric vehicles need to be queued or not; when the electric vehicles with the charging demand need to be queued, the charging demand priority of the electric vehicles is determined, and a vehicle storage instruction and a charging instruction are sent to an electric vehicle controller according to the charging demand priority; and the electric vehicle controller is used for receiving the vehicle storage instruction sent by the garage server to carry out vehicle storage operation and receiving the charging instruction ...

METHOD FOR PREPARING HIGH-STRENGTH AND HIGH-MODULUS POLYETHYLENE FIBER

Disclosed is a method for preparing a high-strength and high-modulus polyethylene fiber. The method comprises: blending a polyethylene raw material having a weight-average molecular weight of 0.6-1.2 million obtained by the polymerization of a single active center catalyst and an auxiliary agent; extruding the blend via a screw extruder as unstretched polyethylene thick filaments; after the unstretched thick filaments are cooled, same entering a hot cabinet for a high-temperature multistage stretching; and rolling a polyethylene fiber, which has been subjected to multistage stretching, to obtain a polyethylene fiber having a tensile strength of 25 cN/dtex or more and a tensile modulus of 900 cN/dtex or more. In contrast to the prior art, the preparation method has a simple production process flow, is environmentally friendly and energy-saving, and has a high safety factor, and a low production cost.

Genetically engineered bacterium for efficiently degrading 3-phenoxybenzoic acid

The invention discloses a genetically engineered bacterium capable of efficiently degrading 3-phenoxybenzoic acid (3-PBA). A specific primer is adopted to amplify the full length of a 3-PBA degradation gene sca from total DNA of sphingomonas SC-1, the full length of the 3-PBA degradation gene sca is connected to a cloning vector pMD18-T, the full length of the 3-PBA degradation gene sca is converted into a competent cell E.coli DH5alpha, a primer containing a restriction enzyme cutting site is adopted to amplify a target fragment with pMD18-T-sca as a template, the target fragment is connected with a vector pET28a (+), the target fragment is converted into a competent cell E.coli BL21 (DE3), and genetic engineering bacteria are constructed; a segment of coding 3-PBA degradation gene sca is obtained, the full length of the sequence is 1230 bp, 409 amino acids are coded, the degradation rate of 20 mg/L 3-PBA in 6 h reaches 76.18%, and complete degradation can be achieved in 24 h; the invention ...

METHOD FOR PREPARING HIGH-PERFORMANCE ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE RESIN

Provided is a method for preparing a high-performance ultra-high molecular weight polyethylene resin. An ethylene monomer is subjected to a polymerization reaction by means of a single active site-loaded polyethylene catalyst in a reactor to prepare a polyethylene resin having a lower entanglement degree and a narrower molecular weight distribution. Compared with the prior art, the polyethylene raw material obtained by means of polymerization has the characteristic of a narrow molecular weight distribution, thereby greatly improving the mechanical properties of the resulting ultra-high molecular weight polyethylene; furthermore, the low entanglement property thereof solves the current problem that an ultra-high molecular weight polyethylene with a narrow molecular weight distribution is difficult to uniformly dissolve in a solvent.

FUSED HETEROCYCLE STRUCTURE-CONTAINING COMPOUND, PREPARATION METHOD THEREFOR AND APPLICATIONS THEREOF, AND FUNGICIDE

The present invention relates to the field of agricultural fungicides. Disclosed are a fused heterocycle structure-containing compound, a preparation method therefor and applications thereof, and a fungicide. The fused heterocycle structure-containing compound has the structure as represented by formula (1), formula (2), or formula (3). The compound of the present invention provides excellent control effects with respect to plant diseases caused by various oomycetous pathogens such as Phytophthora infestans, Phytophthora capsica, Pythium ultimum, Phytophthora nicotianae, Phytophthora litchi, and Pseudoperonospora cubensis, is obviously better than conventional oomycosis control agent dimethomorph, and has great market development prospects.

RPA primer, kit and detection method for detecting cryptocaryon irritans

The invention relates to an RPA primer, a kit and a detection method for detecting cryptocaryon irritans, and belongs to the technical field of cryptocaryon irritans detection. The technical problem to be solved by the invention is to provide the RPA primer, the kit and the detection method for detecting cryptocaryon irritans. The RPA primer for rapidly detecting the cryptocaryon irritans, disclosed by the invention, has a specific nucleotide sequence. The total DNA of a sample is taken as a template, RPA amplification is carried out by utilizing the primer pair, then agar gel electrophoresis detection is carried out, if a 232bp electrophoretic band can be detected, the cryptocaryon irritans is judged to be positive, and otherwise, the cryptocaryon irritans is judged to be negative. According to the method disclosed by the invention, the total DNA of four cryptocaryon irritans larvae can be detected at least. The method for detecting the cryptocaryon irritans is simple and convenient to ...

Attapulgite mud film and preparation method thereof

The invention discloses an attapulgite mud film, and the attapulgite mud film is prepared from attapulgite slurry and stearic acid. According to the invention, 70-75 parts of attapulgite slurry (10% of solid content) is adopted, and the attapulgite has a large specific surface area, so that the attapulgite slurry has super-strong adsorption capacity, can adsorb secreted redundant grease and other harmful organic matters when acting on human skin, makes the skin fresher, can efficiently remove harmful metal ions deposited on the surface of the skin, and meanwhile, can effectively remove harmful metal ions deposited on the surface of the skin. When the attapulgite mud film acts on the skin, the skin can form a temporary closed structure, the surface of the skin is heated, pores are opened, dirt, grease and harmful toxins deposited in the pores are adsorbed by utilizing the ultra-strong adsorption capacity of the attapulgite mud film, and a large amount of adsorbed water exists on the inner ...

Real-time quantitative PCR (Polymerase Chain Reaction) detection primer and detection kit for grouper iridovirus

The invention relates to a grouper iridovirus real-time quantitative PCR detection primer and a detection kit, and belongs to the technical field of grouper iridovirus detection. The technical problem to be solved by the invention is to provide the grouper iridovirus real-time quantitative PCR detection primer and the detection kit. The nucleotide sequence of the PCR detection primer is as follows: the nucleotide sequence of a forward primer 075R 241-F is as shown in SEQ ID No. 1, and the nucleotide sequence of a reverse primer 075R 241-R is as shown in SEQ ID No. 2. On the basis of detection of the SGIV in the different types of groupers, the optimal specific primer suitable for the different types of groupers is screened out, the primer has better specificity, the possibility of cross reaction between the different types of groupers and other pathogens in the SGIV detection process can be avoided, and the accuracy and efficiency of SGIV real-time quantitative PCR detection are improved ...

Manufacturing method of voltage transformer convenient to assemble and overhaul

The invention discloses a manufacturing method of a voltage transformer convenient to assemble and overhaul, and relates to the technical field of high-voltage measurement or relay protection of a power system. A secondary winding and a primary winding are concentrically and respectively wound on a resin insulation framework by adopting winding equipment, then are sleeved on an iron core column, and are subjected to insulation and buffer binding to form a coil device body; after vacuum drying, a coil device body is installed in a pouring mold, a low-voltage shielding net is fixed, a primary winding is connected with three primary high-voltage terminals through a primary lead, another primary lead is connected with a primary N end, and the low-voltage shielding net is fixed to a mold bolt; a secondary terminal and a secondary winding are connected and fixed through a secondary cover plate of the mold, then a primary high-voltage terminal and a primary N end are fixed, the insulation distance ...

Power supply device

The invention provides a power supply device. The power supply device comprises a power converter and a controller. The controller controls the power converter to generate an output power supply. The controller comprises a first detection circuit and a second detection circuit. The first detection circuit detects the output power supply to obtain a first detection result. The first detection result is a variation in an output current value of the output power supply. The second detection circuit detects electrical characteristics other than the output current value to obtain a second detection result. The controller determines whether to limit the output of the output power supply according to the relationship between the first detection result and the second detection result.

Three-dimensional sound velocity field prediction method using three-dimensional convolutional recurrent neural network

The invention discloses a three-dimensional sound velocity field prediction method using a three-dimensional convolutional recurrent neural network, and the method comprises the steps: inputting a plurality of continuous predicted three-dimensional sound velocity fields in a time sequence, carrying out the dimension reduction of the predicted three-dimensional sound velocity fields with high-dimensional features, extracting the features, capturing the relation between the sound velocity field feature time sequences, and predicting a post-prediction three-dimensional sound velocity field; according to the method, a plurality of forecast three-dimensional sound velocity fields which are continuous in time sequence are input into a three-dimensional convolutional layer to carry out dimension reduction and feature extraction by utilizing three-dimensional sound velocity fields which assimilate measured data of a part of regions, and then the obtained features of the plurality of forecast three-dimensional ...

Automatic matching system and method for charging power of shared charging pile

The invention provides a shared charging pile charging power automatic matching system and method, and the system comprises a plurality of shared charging piles which are used for providing a shared charging service; the charging pile sharing platform comprises a user terminal which is used for uploading charging pile related sharing information of a charging pile owner to a server; vehicle related information and travel information of the electric vehicle user are uploaded to a server; the server is used for determining vehicle battery related parameters and average power consumption based on the vehicle related information; and on the basis of the travel information and the remaining capacity of the vehicle battery, charging reminding is carried out on an electric vehicle user, and when the user confirms charging, receiving the estimated residence time uploaded by the user in the current preset area range, and determining an optimal target charging pile according to the maximum charging ...

SULFUR-SUBSTITUTED PODOPHYLLOTOXIN DERIVATIVE, SYNTHESIS METHOD THEREOF, AND USE THEREOF

The present invention discloses a sulfur-substituted podophyllotoxin derivative, synthesis method thereof, and use thereof. The present invention introduces a rigid aromatic heterocyclic compound, as well as a further sulfonamidated product of 3-amino-5-mercapto-1,2,4-triazole, 2-amino-5-mercapto-1,3,4-thiadiazole, 4-methylbenzenesulfonyl chloride, or 4-methoxybenzenesulfonyl chloride as a substituent group, into position 4 of the C-ring of podophyllotoxin or 4'-demethylepipodophyllotoxin to obtain the podophyllotoxin derivative shown in formula (V), said derivative having significantly increased antitumor activity and reduced toxic side effects. Experiments on in vitro tumor cell inhibition indicate that the antitumor activity of the compound of formula (V) of the present invention is significantly higher than the antitumor activity of podophyllotoxin or 4'-demethylepipodophyllotoxin.

Three-dimensional sound velocity field prediction method based on attention mechanism recurrent neural network

The invention discloses a three-dimensional sound velocity field prediction method based on an attention mechanism recurrent neural network, and the method comprises the steps: inputting a plurality of continuous predicted three-dimensional sound velocity fields in a time sequence into a space attention layer, selecting a region, which changes obviously in the time sequence, of the three-dimensional sound velocity fields, and endowing the region with a higher weight; then, the weighted forecast three-dimensional sound velocity field is sent to a time attention layer, the forecast three-dimensional sound velocity field which changes obviously in a time sequence is selected to be endowed with a higher weight, and finally, forecast three-dimensional sound velocity field features using an attention mechanism in space and time are spliced with a later forecast three-dimensional sound velocity field. And predicting a post-reported three-dimensional sound velocity field at a future moment in the ...

Intelligent contract system of block chain

The invention provides an intelligent contract system of a block chain, and the intelligent contract system of the block chain provided by the invention can recover the intelligent contract system, prevent or filter the operation of an attacker and pause the contract at first when a hacker or a fault occurs by setting a tampering and migration system of the intelligent contract, so that the intelligent contract system is more transparent to a user, and the user experience is improved. A hacker is prevented from attacking a user who does not understand migration, and then a getStorageAt function is used for retrieving or scanning a block chain and automatically retrieving a holder by calculating the memory offset of a variable; according to the method, intelligent contract data can be recovered by relying on a GoogleBigTable file disclosed by an Ethernet block chain, and finally a value is set through a constructor function of the intelligent contract, so that a new intelligent contract ...

Aircraft local and global joint hidden path planning method based on marine environment

The invention discloses a local and global combined hidden path planning method for an aircraft based on a marine environment. Comprising the following steps: firstly, calculating to obtain an initial detected probability of an underwater vehicle; taking the lowest detected probability as a target, and utilizing an improved ant colony algorithm to obtain an initial global planning path; a walking starting point, a walking terminal point and walking time are set, the underwater vehicle walks on the current global planning path and collects temperature sampling data in real time, assimilation is carried out on the current temperature field and the temperature sampling data to obtain a new temperature field, and then the detected probability of the underwater vehicle is updated; taking the current walking end point as a global starting point of the aircraft; and optimizing the global planning path until the current walking terminal point is overlapped with the global terminal point, and taking ...

Underwater acoustic channel estimation method based on improved time sequence multiple sparse Bayesian learning

The invention discloses an underwater acoustic channel estimation method based on improved time sequence multiple sparse Bayesian learning. Comprising the following steps: firstly, representing an underwater acoustic channel model as a sparse form containing multipath time delay and multipath fading factors, and then obtaining an initial dictionary matrix; performing multiple denoising on the received broadband signal to obtain a reconstructed time domain denoising signal matrix; performing channel estimation on the reconstructed frequency domain de-noised signal matrix by using a weighted minimum l1 norm regularization algorithm to obtain a channel estimation matrix, and further performing calculation to obtain a corrected dictionary matrix and an initialized hyper-parameter; then performing time domain underwater acoustic channel estimation by using a time sequence multiple sparse Bayesian learning method based on time correlation to obtain a multipath time delay estimation result; and ...

Marine environment field reconstruction method based on multistage interpolation method

The embodiment of the invention provides a marine environment field reconstruction method based on a multilevel interpolation method. The method is used for fusion of multi-source data such as a low-resolution grid environment field output by an ocean power mode and high-precision data observed by a mobile node, and a high-resolution and high-precision ocean environment field is obtained through multistage interpolation reconstruction. Multi-source data fusion is always carried out in a uniform grid, firstly, mobile node observation data is fused into a low-resolution grid field output by an ocean power mode through a mean substitution method, and a fused grid field is obtained; constructing a radial basis function (RBF) grid interpolation model to extract grid features, expanding the fused grid field, and filling a grid attribute value by using the grid interpolation model to obtain an expanded grid field; and finally, repeating the previous steps, and completing high-resolution reconstruction ...

Outdoor closed type zero sequence current transformer

The invention relates to a high-voltage protection device of an electric power system, in particular to an outdoor closed type zero sequence current transformer. Comprising a bottom plate and a secondary insulator arranged on the bottom plate, the secondary insulator is of an annular structure with a primary bus port in the center, a secondary junction box is arranged at the bottom of the front end of the secondary insulator, and the secondary junction box and the secondary insulator are of an integrated structure formed by pouring epoxy resin; an annular iron core and a secondary winding wound on the annular iron core are sealed in the secondary insulator; and a secondary wiring terminal is arranged in the secondary wiring box. A closed structure is adopted, firmness and reliability are achieved, and performance is stable; and the secondary junction box and the secondary insulator are poured together, so that sufficient sealing performance, dust prevention, electricity larceny prevention ...

High-voltage pulse isolator

The invention relates to the technical field of power system switch cabinets, in particular to a high-voltage pulse isolator. Comprising a high-voltage insulator and two groups of coils sealed in the high-voltage insulator, wherein the high-voltage insulator comprises a transformer body part and a stand column arranged at the lower end of the transformer body part, the two groups of coils are arranged in the transformer body part in parallel, high-voltage side wiring terminals of the two groups of coils are arranged at the top end of the transformer body part, low-voltage side wiring terminals of the two groups of coils are arranged on two sides of the lower end of the stand column, and an umbrella skirt is arranged on the outer surface of the stand column. According to the invention, the insulation is reliable, the internal and external electric fields are uniform, the structural design is reasonable, it is ensured that the product has a large surface insulation creepage distance and good ...

Underwater sound velocity sequence classification method based on deep clustering

The invention discloses an underwater sound velocity sequence classification method based on deep clustering. The method comprises the following steps: firstly, performing depth information segmentation on each original sound velocity curve sequence of a sea area to obtain a plurality of original sound velocity curve sequences of each depth area; performing multi-section linear fitting on each original sound velocity curve sequence by using a least square method and a global optimization algorithm, and performing screening to obtain corresponding sound velocity line segment sequences in combination with an original curve segmentation gradient deviation sum and a fitting threshold value; and finally, inputting the sound velocity line segment sequence of each depth area into a corresponding depth clustering model for clustering, and obtaining the category of all sound velocity line segment sequences in each depth area through clustering. Compared with a traditional clustering algorithm, implicit ...

New application of amomum tsao-ko oil

... 本发明提供了草果油在制备治疗耐甲氧西林金黄色葡萄球菌感染疾病的药物中的用途。本发明还提供了草果油与β‑内酰胺类抗生素联合使用在制备治疗耐甲氧西林金黄色葡萄球菌感染疾病的药物中的用途。本发明草果油具有明显体外抗MRSA活性和体内抗MRSA感染疗效，且具有增强β‑内酰胺类抗生素体外抗MRSA活性，说明草果油不仅具有单独作为抗感染药物新药的开发与应用前景，还具有与β‑内酰胺类抗生素联合使用，恢复其抗MRSA活性，逆转MRSA多重耐药活性中药新药的开发与应用前景。 ...

Adhesive glue and curing method and application thereof

The invention discloses an adhesive as well as a curing method and application thereof. The adhesive comprises the following components in percentage by weight: 50-80% of polyurethane modified acrylate, 0.1-10% of a thixotropic agent, 0.2-8% of a thermal initiator and 2-30% of a diluent, and the thixotropic agent is a carbon nanotube. The bonding glue is soft, good in toughness, high in viscosity, good in thixotropy, low in curing temperature, high in curing degree, free of silicon precipitation and high in adhesive force, can well meet the production requirements and performance requirements of the HDD bonding process, and effectively avoids damage to a hard disk due to scratching.

Dynamic distribution method and system for charging power of electric vehicle

The invention provides an electric vehicle charging power dynamic distribution method and system, and relates to the technical field of electric vehicle power distribution, and the method comprises the steps: determining the charging modes and travel destinations of all current vehicles, and determining the positions of all the current vehicles and the distances between all the current vehicles and the travel destinations; obtaining available charging total power in a power grid, residual available power of the power grid, current battery quantity of a battery of a vehicle being charged in the power grid, total battery capacity of the battery of the vehicle, current charging power of each vehicle in the power grid and charging demand power data; and calculating the charging priority weight of each vehicle by using each data, calculating the charging priority weight of the current to-be-charged vehicle when a new to-be-charged vehicle is connected to a power grid, and dynamically distributing ...

Method and device for calibrating parameters of pendulum shaft and computer readable storage medium

According to the method for calibrating the parameters of the pendulum shaft, the part from the rotation center of the pendulum shaft to the tail end of the pendulum shaft is determined as an equivalent pendulum shaft of the pendulum shaft, the length of the equivalent pendulum shaft is the equivalent pendulum length, the parameters comprise one or more of the initial angle and the equivalent pendulum length, and the method comprises the steps that S1, the pendulum shaft is arranged, so that the equivalent pendulum shaft is located at the initial position; s2, the pendulum shaft is rotated to enable the equivalent pendulum shaft to rotate by a predetermined angle alpha from the initial position, and the vertical distance H1 between the tail end of the pendulum shaft and the reference plane is measured; s3, the pendulum shaft is rotated in the opposite direction to enable the equivalent pendulum shaft to rotate by an angle beta i from the initial position, and the vertical distance H2i between ...

Bacillus subtilis for effectively degrading cypermethrin and application thereof

The invention relates to the field of reduction and removal of pollutants in environment or food by utilizing microorganisms, in particular to bacillus subtilis which is separated from excrement of healthy broiler chickens and has relatively high degradation capability on cypermethrin. The strain number of bacillus subtilis capable of effectively degrading cypermethrin is J6, and the bacillus subtilis is registered and preserved in the China General Microbiological Culture Collection Center (CGMCC); the preservation number is CGMCC (China General Microbiological Culture Collection Center) No.26229, and the preservation date is December 27, 2022. The strain not only can degrade cypermethrin, but also has a good degradation effect on other pyrethroid pesticides and a main degradation product, namely 3-phenoxybenzoic acid, of the pyrethroid pesticides. The bacillus subtilis J6 disclosed by the invention can be used for developing a corresponding biological agent which is used for reducing ...

Hot continuous rolling mill capable of preventing scaling

An anti-scaling hot continuous rolling mill relates to the field of hot continuous rolling mills and comprises a side guide cross beam frame, a side guide transverse width adjusting hydraulic cylinder, a side guide main frame, a side guide width adjusting sliding rail, a working roll bending hydraulic cylinder, a working roll, a working roll contact shaft locking device, a rolling mill inlet side guide and hot rolled strip steel placed on the anti-scaling hot continuous rolling mill. Wherein the first side spraying pipeline, the second side spraying pipeline, the side nozzle and the side hand spraying valve are arranged outside the rolling mill inlet side guide, the side nozzle is installed on the side, close to the working roller, of the first side spraying pipeline, the other side of the first side spraying pipeline is connected with the side hand spraying valve, and the other side of the side hand spraying valve is connected with the second side spraying pipeline; through special structure ...

Elastic exterior wall latex paint and preparation method thereof

The invention relates to the technical field of latex paint, in particular to the field of IPC C09D5, and more particularly relates to elastic exterior wall latex paint and a preparation method thereof. The coating is prepared from the following raw materials in parts by weight: 0.5 to 0.9 part of dispersing agent, 0.13 to 0.32 part of defoaming agent, 0.1 to 0.3 part of wetting agent, 32 to 43 parts of body filler, 30 to 35 parts of emulsion, 0.3 to 0.7 part of coalescing agent, 0.2 to 0.3 part of sterilizing agent, 0.5 to 1.5 parts of small molecular alcohol, 0.1 to 0.2 part of coating pH value regulator, 0.25 to 0.7 part of thickening agent and 20 to 35 parts of water. The viscosity of the emulsion paint can be well controlled, the leveling property of the emulsion paint is improved, a smooth, complete and attractive paint film can be formed on an outer wall surface, and the emulsion paint has certain washing resistance and water resistance.

Molding drum and molding machine

The invention provides a forming drum and a forming machine, the forming drum comprises a main shaft assembly, a supporting assembly and an overturning assembly, the supporting assembly is arranged around the main shaft assembly and is used for supporting apex; the overturning assembly is arranged around the main shaft assembly and can rotate relative to the main shaft assembly so as to overturn the apex. By means of the forming drum, the technical problem that in the prior art, the surfaces of overturning drum tiles are seriously stained with materials is solved.

Laser cutting method based on micro-connection section, laser cutting method and control device

The laser cutting method based on the micro-connection section is applied to cutting of the micro-connection section on a to-be-cut workpiece through a laser cutting head and comprises the steps that the positions of the micro-connection section, a deceleration section and an acceleration section on the to-be-cut workpiece are obtained, the deceleration section is represented as a first preset distance in front of the starting point of the micro-connection section, and the acceleration section is represented as a second preset distance in front of the starting point of the micro-connection section; the end point of the deceleration section is the starting point of the micro-connection section; determining the acceleration of the deceleration section and the acceleration section; when the laser cutting head moves to the starting point of the deceleration section at the current cutting speed, the laser cutting head is controlled to enter a deceleration cutting mode; when the laser cutting ...

Collimator sheath for multi-attitude laser cleaning

The invention relates to the technical field of laser cleaning, and discloses a collimator sheath for multi-attitude laser cleaning, which comprises a fixed seat, one side of the fixed seat is connected with a support ring, and the other end of the support ring is integrally molded with a functional section; the outer side of the functional section is connected with a fastening lip, and an open groove is formed in the surface of the functional section in a penetrating mode. And a size adjusting structure is arranged in the supporting ring. According to the invention, through the arrangement of the collimator sheath, the two ends of the sheath can effectively fix the outer wall of the collimator under the action of the fixing seat and the fastening lip, the installation stability and flexibility of the collimator are ensured, and through the arrangement of the fastening lip, a user can install collimators of different specifications through a clamp, and the installation efficiency is improved ...

Forming preparation method of silicon-aluminum composite oxide pellets

The invention relates to a forming preparation method of silicon-aluminum composite oxide pellets, which comprises the following steps: uniformly mixing a silicon source and an aluminum source in water to obtain a silicon-aluminum mixed solution; inorganic acid is added into the silicon-aluminum mixed solution, sol is gradually formed through stirring, and stirring continues until the viscosity of the sol reaches 800-1000 mPa.S; dropwise adding the sol into an oil ammonia column forming device for forming, aging in an ammonia water phase, and then drying and roasting step by step to obtain the silicon-aluminum composite oxide pellets. Compared with the prior art, the invention has the advantages of large specific surface area and pore volume, high compressive strength, better carbon deposition resistance, liquid water resistance and the like.

Microinjection method and application of snakehead

The invention is applicable to the field of aquatic animal genetic breeding and functional gene verification research, and provides a snakehead microinjection method and application thereof, and the snakehead microinjection method comprises the following steps: using antisense morpholine ring oligonucleotide or exogenous mRNA of a target gene as an injection reagent; mixing the injection reagent with the injection indicator to obtain a mixture; and carrying out micro-injection on the snakehead fertilized eggs in the single cell period 30 minutes after the snakehead eggs are fertilized, and introducing the mixture into the snakehead fertilized eggs. The method is a microinjection method for establishing a snakehead embryo for the first time and is applied to antisense morpholine ring oligonucleotide gene knock-down and construction of an exogenous mRNA expression model for the first time, and the technology can be used for researching snakehead gene functions and accurately modifying snakehead ...

High-carbon steel wire for greenhouse snap spring and manufacturing method of high-carbon steel wire

The invention relates to a high-carbon steel wire for a greenhouse snap spring and a manufacturing method of the high-carbon steel wire. The high-carbon steel wire comprises the following chemical components in percentage by weight: 0.59-0.86% of C, 0.20-0.55% of Si, 0.60-1.20% of Mn, less than or equal to 0.03% of P, less than or equal to 0.03% of S, 0.002-0.006% of B and 0.03-0.05% of Ti. And the balance of Fe and inevitable impurities. A high-carbon steel hot-rolled wire rod is used as a raw material, the drawability of the wire rod is improved through special chemical components and a controlled rolling and controlled cooling process, the mechanical property and the processing property of a finished steel wire are guaranteed, the steel wire with the needed strength and plasticity is produced through drawing of a wire drawing machine, surface galvanizing is conducted through hot galvanizing equipment, and corrosion of air and rainwater is prevented; and finally, the high-carbon steel ...

Method for measuring sound reflection coefficient of material in sound tube

The invention discloses a method for measuring a sound reflection coefficient of a material in a sound tube, which comprises the following steps of: firstly, putting a sample to be tested into a test environment to transmit a signal and collect the signal, and performing discrete Fourier transform to establish a sparse matrix form of a sound receiving signal; then determining a Bayesian formula containing hyper-parameters, and performing recursive solution on the hyper-parameters to obtain an estimation result of the multipath time delay; transmitting a single-frequency PCW signal and an acquisition signal, and solving an amplitude parameter by adopting a least square method so as to obtain an optimal multipath amplitude estimation result; and finally, according to the estimation result of the multipath time delay and the estimation result of the multipath amplitude, the incident direct wave and the primary reflection wave are extracted and separated, and the reflection coefficient of the ...

Compound liquorice tablet capable of being prepared by dry powder direct compression process

The invention discloses a compound liquorice tablet capable of being prepared by a dry powder direct compression process and a preparation method of the compound liquorice tablet. The preparation method comprises the following steps: weighing, primarily mixing, sieving, dissolving and adsorbing, premixing, totally mixing, tabletting and packaging. By controlling the average particle size of the primary mixture (the mixture of the licorice extract, the poppy fruit extract powder and the sodium benzoate), the appearance of the preparation is fundamentally ensured; by screening and selecting a novel auxiliary material polyvinylpyrrolidone, the problems of compressibility and dissolution rate are solved; by using silicon dioxide, the problems of adsorption and stability of volatile oil are solved, and the flowability and compressibility of particles are improved; by using a direct tabletting method, the process is simplified, the efficiency is improved, the content of volatile oil in a finished ...

Enterobacter hormaechei and application thereof

The invention relates to an enterobacter hormaechei, which is named as Enterobacter hormaechei, and is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC NO.1. 19421, the preservation address is No.3, Yard 1, Beichen West Road, Chaoyang District, Beijing, and the preservation date is December 28, 2021. The sequence of the enterobacter hormaechei RH3 gene is as shown in SEQ ID NO.1, and the enterobacter hormaechei RH3 is lack of an hdc gene. The bacterium can generate histamine by utilizing histidine, but a key gene-hdc gene for forming the histamine is deleted, so that a research material can be provided for a histamine synthesis mechanism of hdc gene deleted bacteria.

Tire mold pattern block laser automatic cleaning tool

The invention relates to the technical field of tire mold cleaning equipment, in particular to a tire mold pattern block laser automatic cleaning tool which comprises a table board, an operation table and a controller are sequentially arranged at the top end of the table board, and a displayer used in cooperation with the controller is arranged at the top end of the operation table; the laser cleaning mechanism for automatically realizing laser cleaning is arranged at the top end of the table board; the rotating table mechanism is arranged at the top end of the table board; light emitted in the Y direction in the laser cleaning mechanism is driven by the six-axis mechanical arm to move left and right, the posture adjusting time of the six-axis mechanical arm is shortened through the double-galvanometer cleaning head, the cleaning efficiency of the pattern block is improved, automatic cleaning is achieved, and it can be avoided that a manual laser gun is used for scanning and cleaning back ...

Railway track detection device

A railway track detection device relates to the technical field of rail detection and is characterized in that the number of clamping mechanisms is two, two connecting mechanisms are mounted between the two clamping mechanisms, a groove is formed in the rotating end of each connecting mechanism, a placing mechanism is mounted in each groove, and a power switch group is mounted at the placing end of each placing mechanism; according to the railway track detection device, the railway track detection device is installed on the rails through the clamping mechanism, adjustment can be conducted according to the standard rails and the narrow rails, the railway track detection device is driven to move through the clamping mechanism, the distance between the two rails is detected in the moving process, and the detection accuracy is improved. And the numerical control terminal for comparison is placed through the placement mechanism, so that a worker can check the numerical control terminal in time ...

Reciprocating impact type staggered filter cartridge dust removal device

The invention relates to the technical field of dust removal, and discloses a reciprocating clash type staggered filter cartridge dust removal device which comprises a shell and a pattern plate, the pattern plate divides the interior of the shell into an air inlet chamber, a filter chamber and a settling chamber, and the filter chamber is a space formed in a horizontally arranged staggered filter cartridge; the outside of the staggered filter cartridge is an external space; an ash cleaning system is arranged outside the filtering chamber; the left end of the staggered filter cartridge is communicated with the air inlet chamber, and the right end is communicated with the settling chamber; the external space is communicated with the settling chamber; the ash removal system comprises a spraying and blowing pipe wrapping the staggered filter cartridge and the periphery of the external space, and a staggered filter baffle which is arranged in the external space and can reciprocate left and right ...

Method for preparing dendritic calcium sulfate from gasified ash disposal waste liquid

The invention provides a method for preparing dendritic calcium sulfate whiskers from gasified ash disposal waste liquid, which mainly comprises the following two steps of: 1, preparing calcium sulfate dihydrate, mixing the gasified ash disposal waste liquid with calcium chloride, ageing, and filtering to obtain a calcium sulfate dihydrate wet filter cake, and 2, adding anhydrous calcium sulfate whisker seed crystals into water, adding zinc acetate and ethylene glycol bis (2-aminoethyl ether) tetrasodium tetraacetate as targeted control agents, preparing the dendritic calcium sulfate hemihydrate under the conditions of certain temperature and pressure, filtering, washing and drying to obtain a finished product of the dendritic calcium sulfate hemihydrate. The method is simple to operate and low in cost, the dendritic calcium sulfate hemihydrate whiskers are prepared for the first time, crystals are complete, supporting force is high, and the dendritic calcium sulfate hemihydrate whiskers ...

Wireless communication method, wireless receiving apparatus, and non-transitory computer storage medium

The invention relates to a wireless communication method, a wireless receiving device and a non-transitory computer storage medium. The wireless communication method comprises the following steps: receiving two paths of signals including a first path of signals and a second path of signals from a transmitting device with at least two transmitting antennas by using two receiving antennas; performing timing synchronization processing on the two paths of signals to obtain a synchronization deviation of the two paths of signals; and according to the synchronization deviation of the two paths of signals, the two paths of signals are selected or combined to obtain a final signal, and the signal quality of the final signal is superior to that of a single path of signal with poorer signal quality in the two paths of signals. According to the method and the device, huge resource waste caused by the fact that a receiving device provided with a plurality of antennas receives signals only through one ...

Method for cleaning device, cleaning device and computer readable storage medium

The invention discloses a control method of a cleaning device. According to the control method of the cleaning device, the cleaning device operates as an air purifier or as a base station of the sweeping robot, the base station is provided with a fan, and the fan comprises a first type of wind and a second type of wind used for purifying air and a third type of wind used for collecting dust for the sweeping robot. The control method of the cleaning device comprises the steps of judging whether the sweeping robot is located in an accommodating space of the cleaning device; if not, judging whether the sweeping robot is in an operation stage or not; if yes, whether the first current air dust concentration in the air is larger than the first preset dust concentration or not is judged; if yes, a fan of the cleaning device is controlled to work with the second type of wind. In the working process of the sweeping robot, the side brushes whisk dust to cause the dust concentration in the air to ...

Buffer pressure relief device for descaling pump

The invention belongs to the technical field of high-pressure water descaling systems in the metallurgical industry, and discloses a buffer pressure relief device for a descaling pump to solve the problems that a back pressure relief loop of a primary descaling system is short in service cycle, production is interrupted due to water leakage and the like. One end of the three-way pipe connector is connected with a low-pressure water return pipeline, the other end of the three-way pipe connector is connected with a buffering pressure relief loop, the buffering pressure relief loop comprises a first outer sleeve, one end of the first outer sleeve is connected with the three-way pipe connector, the other end of the first outer sleeve is connected with a second outer sleeve, and a buffering valve element is installed in an inner cavity of the connecting position of the first outer sleeve and the second outer sleeve. A flow stopping hole is formed in the radial direction of the buffering valve ...

Warp knitting fabric production warp knitting machine with positioning and cutting mechanism

The invention discloses a warp knitting fabric production warp knitting machine with a positioning and cutting mechanism, which comprises a base, supporting columns are symmetrically and fixedly connected to the lower side wall of the base, a pulley is mounted at the lower end of each supporting column, a supporting rod is fixedly connected to the upper side wall of the left end of the base, a rectangular frame is mounted at the top end of the supporting rod, and the rectangular frame is fixedly connected to the upper side wall of the left end of the base. And a positioning adjusting mechanism is arranged on the rectangular frame. According to the warp knitting machine, the threaded rod is rotated anticlockwise to drive the clamping plate to be upwards separated from the guide rail, the position of the positioning frame can be freely adjusted, warp knitting cloth is fed into the warp knitting machine body, the production requirement can be met, it can be guaranteed that the warp knitting ...

Modularized steel structure floor slab for building

The modular steel structure floor slab for the building comprises a stand column mechanism, a foldable auxiliary beam mechanism is arranged on the lower portion of the stand column mechanism, a plurality of floor slab modules are arranged above the foldable auxiliary beam mechanism, and bolt fixing plates are arranged at the four ends of the foldable auxiliary beam mechanism and the two sides of one corner of each floor slab module correspondingly. A plurality of spliced floor slab modules can be lifted to a preset height through cooperation of the foldable auxiliary beam mechanism and the stand column mechanism, the finished stand column mechanism becomes a supporting column of a newly-built floor slab and a floor slab auxiliary beam, construction of a steel structure floor slab in a building is greatly facilitated, and the construction period is shortened; in order to facilitate transportation, the auxiliary beams can be folded to be parallel to the stand column mechanism, after the auxiliary ...