889results about How to "Harm reduction" patented technology

The invention relates to a network data leakage monitoring system and method, and the system comprises a data collection module, a data preprocessing module, an anomaly detection module, a risk assessment module and an alarm module. The data acquisition module is used for acquiring network data from a network data source in real time; the data preprocessing module is used for cleaning and standardizing the acquired network data to obtain preprocessed network data; the anomaly detection module identifies an anomaly mode and calculates a confidence score according to the preprocessed network data by using a pre-trained neural network model; the risk assessment module assesses the potential data leakage risk in real time based on the type of the abnormal mode and the confidence score, and generates a comprehensive risk assessment result; and the alarm module generates and sends alarm information when the comprehensive risk assessment result exceeds a preset threshold value. The system can accurately detect and evaluate the network data leakage risk in real time, and provides effective security alarm.

The invention discloses a pedestrian and vehicle detection method based on an improved YOLOv10n. The pedestrian and vehicle detection method comprises the following steps: on the basis of an original model YOLOv10n, replacing a first layer and a third layer in Backbone and a seventeenth layer Conv in Neck with a space-to-depth convolution SPDConv; a focused spatial pyramid pooling module ASPPF is constructed, and semantic fusion of cross-level features is optimized; designing a global grouping coordinate attention module GGCA, fusing the GGCA into a Neck layer, generating attention maps by using global information of the feature maps in the spatial dimension, and weighting the input feature maps through the attention maps to enhance the feature expression ability; a WIou loss function is introduced, the bounding box loss of the network is optimized, and the convergence speed and regression precision of the model are improved. And training a model by using a data set which is made by autonomous labeling to obtain a training result, and completing a pedestrian and vehicle detection task by using an optimal training weight. According to the method, a good detection effect is achieved with a small number of model parameters, and the pedestrian and vehicle recognition accuracy is well improved.

The invention provides a safety protection algorithm design method for an industrial control system, which is used for determining a safety protection target and range, determining a key component and a business process and defining a protection boundary. And then risk assessment and threat modeling are carried out, potential threat and attack vectors are identified, and asset vulnerability and risk influence are assessed. Designing a security protection algorithm framework, selecting proper security technology and algorithm, and determining architecture and module composition. Identity authentication modules, data encryption and integrity protection modules, intrusion detection and defense modules and the like are designed in detail, and authentication modes, key management modules, integrity verification modules, intrusion detection algorithms, response strategies and the like are designed. And then realizing and integrating an algorithm, and programming in the system to realize and guarantee the cooperative work among the modules. And the performance and the security of the algorithm are optimized through a function and security test. And finally, deploying the algorithm to the industrial control system, continuously monitoring the operation state and the security situation of the industrial control system, dynamically adjusting the strategy and parameters, and effectively guaranteeing the security of the industrial control system.

According to the brown planthopper lethal gene Nlpfam and the application thereof in biological prevention and control, the brown planthopper lethal gene Nlpfam can cause brown planthopper death after being interfered, so that dsRNA or an interference reagent is prepared through transcription of the brown planthopper lethal gene Nlpfam, the Nlpfam gene can be effectively interfered after the dsRNA or the interference reagent is injected into the brown planthopper, the abdomen of the brown planthopper becomes black, and the brown planthopper death can be inhibited. The brown planthopper can be effectively killed, and the biological control on the brown planthopper is realized.

The invention belongs to the technical field of rock-soil side slope protection, and particularly relates to an expansive soil side slope flexible ecological comprehensive supporting system which comprises an intercepting ditch, a vegetation protection layer, a composite waterproof layer, flexible anchor rods, water seepage and drainage pipes, cultivation and planting soil, a drainage ditch, a backfill soil layer, a step-shaped slope surface, a slope surface and slope protection vegetation. The slope surface is excavated into a step-shaped slope surface, a composite waterproof layer, expansive soil backfill soil, a vegetation protection layer and cultivation and planting soil are sequentially arranged on the step-shaped slope surface from bottom to top, and slope protection vegetation is planted and formed on the cultivation and planting soil; the composite waterproof layer is fixed to the step-shaped slope face through the flexible anchor rods. The vegetation protection layer and the slope protection vegetation together reinforce the shallow soil body, and the composite waterproof layer and the flexible anchor rod play a role in absorbing and relieving the received expansive force. The method has an ecological greening effect, has the functions of common supporting of the shallow surface layer and the deep layer of the expansive soil slope, flexible reinforcement and expansion reduction and allowable generation of a small amount of deformation, is simple in construction and high in efficiency, and can realize long-term stability of the shallow surface layer and the deep layer of the expansive soil slope.

The invention discloses an intelligent gas pipeline inspection method based on an unmanned vehicle, and relates to the technical field of unmanned detection, and the method comprises the steps: making an inspection plan, and planning an inspection route; establishing a precise map to realize autonomous navigation and positioning, and performing autonomous inspection according to a planned inspection route; an environment monitoring sensor module carried on an inspection unmanned vehicle is used for monitoring the operation environment of a gas pipeline, and when an environment air index is detected to be abnormal, an ultrasonic sensor array is used for identifying a sound wave signal generated by gas pipeline leakage, positioning a gas leakage point and recording and reporting early warning information and on-site conditions to a remote monitoring station; meanwhile, sound-light alarm information is generated; data of sensors along the gas pipeline and in the gas pipeline are read, an inspection video is uploaded to a server, and a special inspection task is completed through remote control. According to the invention, autonomous inspection can be realized, gas leakage can be accurately identified, a gas leakage point can be positioned, and the harm of gas leakage accidents can be reduced.

The invention discloses a phase change energy storage waterborne polyurethane nanofiber membrane and a preparation method thereof. Lignin-based phase change microcapsules are prepared by combining ultraviolet crosslinking with lignin shell packaging, and then the nanofiber membrane containing the phase change microcapsules is prepared through an electrostatic spinning technology. And finally, constructing the waterborne polyurethane phase change fiber membrane with asymmetric wettability through a low-temperature plasma technology. According to the invention, lignin is self-assembled to form nanoparticles, and ultraviolet light induces free radical polymerization to form a polymer film, so that the packaging capability of the phase change material is improved. The phase change microcapsule prepared by the method is high in packaging efficiency and excellent in phase change performance, the preparation process is green and environment-friendly, the technological operation is simple, the temperature of the prepared phase change energy storage waterborne polyurethane nanofiber membrane conforms to the comfortable temperature range of a human body, and the phase change energy storage waterborne polyurethane nanofiber membrane has excellent temperature regulation, waterproof and moisture permeable performance and is suitable for being used in the field of water treatment. Good application prospects are realized in the field of functional textiles with functions of intelligent temperature regulation, water resistance and air permeability and the like.

The invention relates to a battery module capable of effectively preventing thermal runaway diffusion, a protection method of the battery module and an energy storage device. The battery module comprises an upper shell, a lower box body, a battery module, a pressure relief flow guide part, a panel structural part and a CCS assembly, the upper shell and the lower box body form a containing cavity; at least one group of battery modules are arranged in the accommodating cavity; the battery module comprises at least one battery monomer, the battery monomers are connected in series, a safety valve is arranged on each battery monomer, and a pressure relief flow guide part is arranged above the safety valve; a panel structural member is arranged at one end of the battery module along the arrangement direction of the battery monomers; and a CCS assembly is arranged above the battery module. According to the invention, gas and electrolyte can be separated after the single battery is sprayed, and are respectively and directionally discharged, so that the situation that other normal single batteries or modules are damaged due to disordered splashing of sprayed objects is avoided, and spontaneous combustion or explosion of the battery module is avoided.

The invention relates to Omarlliptin, in particular to a novel method for preparing Istradafylline, and relates to a preparation method of Istradafylline, in particular to a preparation method of Istradafylline. The method comprises the following steps: carrying out coupling reaction on a compound Ia and TMS acetylene to obtain an intermediate Ib; carrying out bromination reaction on the intermediate Ic under the action of NBS (N-bromosuccinimide) to obtain an intermediate Id; carrying out substitution reaction on the intermediate Id and tert-butyl carbamate under the action of potassium tert-butoxide to obtain an intermediate Ie; reacting the intermediate Ie with paraformaldehyde to obtain an intermediate If; carrying out cycloaddition reaction on the intermediate If and the intermediate Ib to obtain a key intermediate Ig; carrying out asymmetric catalytic hydrogenation reduction on the intermediate Ig to obtain an intermediate Ih; and removing a protecting group from the intermediate Ih in a hydrochloric acid and ethyl acetate system to obtain a final product. The method is short in route, simple and convenient to operate, mild in condition, high in reaction yield, environment-friendly and easy for industrial production, and dangerous and highly toxic products are prevented from being used and hazardous chemicals are supervised. # imgabs0 #

According to the laodelphax striatellus ecdysis gene LsMH and the application thereof in biological prevention and control of laodelphax striatellus, the laodelphax striatellus ecdysis gene LsMH serves as one of key genes for ecdysis of laodelphax striatellus, the laodelphax striatellus ecdysis gene LsMH can be subjected to targeted interference, laodelphax striatellus can be remarkably inhibited from forming adults through eclosion, and laodelphax striatellus death is avoided, so that laodelphax striatellus population is the harm of the laodelphax striatellus to food crops is reduced. The control of laodelphax striatellus is carried out through a biological means, the method is safe and harmless to environment ecology and food, and a new strategy is provided for green control of laodelphax striatellus. The dsRNA or the interference reagent is prepared through transcription of the laodelphax striatellus ecdysis gene LsMH, the LsMH gene can be effectively interfered after the dsRNA or the interference reagent is injected into the laodelphax striatellus, the phenomena that wings are bent or incomplete, the abdomen is wizened and ecdysis is incomplete occur in the ecdysis process of laodelphax striatellus nymphs, laodelphax striatellus eclosion into adults is inhibited, laodelphax striatellus death is avoided, and biological control over laodelphax striatellus is achieved.

The invention discloses an endophytic fungus LH001 and application thereof, and belongs to the technical field of plant disease control. The endophytic fungus LH001 is separated from the root system of wild rice, is classified and named as Pseudophialophora sp.LH001, is preserved in the China Center for Type Culture Collection (CCTCC), and has the preservation number of CCTCC NO: M 20241751. The endophytic fungus LH001 strain is co-cultured with rice and colonized at the root of a rice seedling, so that leaf harm caused by magnaporthe oryzae can be reduced, the disease resistance of the rice to leaf blast in the seedling stage is enhanced, and the prevention and treatment effect reaches 94.05%. Therefore, the endophytic fungus LH001 has great value in popularization and application of the biological control effect on the rice blast in the agricultural field.

The invention discloses a short-process preparation method and application of a vanadyl sulfate electrolyte based on vanadium slag valence regulation and control, and belongs to the technical field of vanadium electrolytes. The method comprises the following steps: leaching the vanadium slag by using sulfuric acid to obtain a leaching solution containing low-valence vanadium; extracting vanadium and chromium in the leachate by adopting an amine organic extraction agent; carrying out reverse extraction by using sulfuric acid; the method comprises the following steps of: firstly, extracting and separating vanadium by using a phosphoric acid extracting agent, and finally, carrying out reverse extraction by using sulfuric acid to obtain the vanadium electrolyte which can be used for constructing a VFB-5kW / 10kWh vanadium battery energy storage system. The traditional established thinking that pentavalent vanadium is extracted through vanadium slag oxidation to serve as a vanadium source to prepare the vanadium electrolyte is broken through, the novel technology for extracting the low-valence vanadium solution from the vanadium slag to directly prepare the vanadium electrolyte is provided, the short-process and green novel technology for preparing the vanadium electrolyte from the vanadium slag is constructed, the efficiency of the vanadium electrolyte preparation technology is improved, and the preparation cost is reduced.

The invention discloses an AGV trajectory tracking method based on vision, and relates to the technical field of heavy-load AGVs, comprising the following steps: S1, the AGV is equipped with a vision acquisition and image processing unit; s2, obtaining a tracking algorithm based on a geometric method; s3, adjusting the visual distance and the planned path to obtain the position coordinates of a front view point; s4, outputting an AGV steering instruction by using the method; s5, a set speed is added, so that the AGV vehicle can realize a trajectory tracking effect; and S6, displaying the effect picture through communication. According to the AGV trajectory tracking method based on vision, the image provided by vision is analyzed and processed to obtain the next motion point, so that the AGV trajectory tracking precision is improved, manual operation of male and female head rotation butt joint is not needed, time and labor are saved, and harm of chemical engineering places to human bodies is reduced; the method can achieve the effects that the path is planned by using environmental information, and the system is controlled by using PID control and an advanced algorithm.

The invention relates to the technical field of industrial waste heat recycling, in particular to an electric heating device and method for superheating saturated steam generated in the evaporative cooling process of a converter, an electric furnace and a steel rolling heating furnace in the iron and steel industry. Clean energy electricity serves as a heat source, saturated steam is heated into superheated steam through the steam superheater, the quality of the saturated steam can be effectively improved, damage of steam condensation water is prevented, and meanwhile steam conveying loss can be reduced; and compared with a traditional fuel gas type overheating device, other emissions are not added, and the problem of environmental pollution cannot be generated. The method is particularly suitable for the superheating process of high-temperature flue gas of a converter and an electric furnace in steel production and saturated steam generated by evaporative cooling steam drums such as a supporting beam in a heating furnace, the quality of (saturated) steam can be greatly improved by adopting the method, meanwhile, the harm caused by condensation of steam into water due to temperature reduction can be prevented, energy waste is effectively reduced, and the production cost is reduced. And the method has high economic benefits.

The utility model relates to the technical field of chemical engineering, provides an automatic chlorine-hydrogen flow ratio control device for a hydrochloric acid synthesis furnace, and solves the problem that the ratio of hydrogen to chlorine in the hydrochloric acid synthesis furnace cannot reach a theoretical set value due to design defects of the conventional device. Comprising a hydrochloric acid synthesis furnace, a hydrogen buffer tank and a chlorine buffer tank, the hydrogen buffer tank and the chlorine buffer tank are connected with the hydrochloric acid synthesis furnace, a hydrogen flow meter and a hydrogen purity detector are arranged between the hydrogen buffer tank and the hydrochloric acid synthesis furnace, and a chlorine flow meter and a chlorine purity detector are arranged between the chlorine buffer tank and the hydrochloric acid synthesis furnace. The online hydrogen purity detector and the chlorine purity detector are additionally arranged, the flow of hydrogen and chlorine is subjected to proportional control, the adding amount of hydrogen and chlorine is automatically adjusted, automatic adjustment is achieved, it is guaranteed that the ratio of hydrogen to chlorine reaches a theoretical set value, and then it is guaranteed that the concentration of finished hydrochloric acid is qualified.

The invention discloses a roadway stacking machine for stacking packaging boxes, and relates to the technical field of packaging box storage, the roadway stacking machine comprises a connecting plate, an electric sliding table I is fixedly mounted on the upper surface of the connecting plate, a storage iron frame is fixedly mounted on the upper surface of the connecting plate, and a sliding block I is mounted at the sliding end of the electric sliding table I; a second electric sliding table is fixedly connected to the upper surface of the first sliding block, a second sliding block is installed at the sliding end of the second electric sliding table, and a correcting assembly is arranged on the bearing platform, so that the effect of ensuring that the position of the packaging box can be adjusted in time when the packaging box is placed on the bearing platform is achieved; the packaging box is accurately located in the center of the bearing platform, in the operation process of the roadway stacking machine, the packaging box cannot deviate due to improper placement position, meanwhile, the situation that the packaging box cannot be placed on the storage iron frame due to inclination is avoided, and therefore the risk that the packaging box falls off is reduced, and the service life of the packaging box is prolonged. And the economic loss caused by falling of the packaging box is reduced.

The utility model relates to the technical field of casting polishing, and particularly discloses a polishing device for casting machinery, which comprises a shell, a polishing table is arranged in the shell, and a polishing mechanical arm is mounted in the shell; the dust collection assembly is arranged at the bottom of the shell; the blowing assembly is arranged at the bottom of the shell. In the casting polishing process, dust generated in the polishing process is sucked into the bottom of the polishing table from the two sides of the polishing table and internal holes through negative pressure airflow and collected, the dust generated in the polishing process is effectively captured, filtered out and collected, and pollution of the dust to the environment and harm of the dust to the health of operators are reduced; and abrasion of dust to the polishing mechanical arm is reduced, and the service life of the polishing mechanical arm is prolonged.

The invention discloses a pesticide residue scavenging agent. The feed additive is prepared from the following components in parts by weight: 90-110 parts of white hyacinth beans, 9-11 parts of papain, 90-110 parts of liquorice, 45-55 parts of folium isatidis, 25-35 parts of perilla leaves, 25-35 parts of fructus forsythiae, 25-35 parts of honeysuckle, 15-25 parts of rhizoma smilacis glabrae, 15-25 parts of ginkgo leaves, 4-6 parts of soybean protease, 9-11 parts of glutathione, 5-7 parts of amino-oligosaccharin, 9-11 parts of amylase and 7-9 parts of walnut peptide. The invention also discloses a preparation method of the pesticide residue scavenger. The method has the following outstanding effects: the method is easy to operate, low in cost, popular in price and remarkable in effect, and can reach the national safety agricultural product indexes.

The utility model relates to the technical field of polyester production feeding, and discloses a polyester PTA feeding port dust automatic negative pressure recovery device which comprises a small PTA stock bin, four PTA feeding ports are arranged above the small PTA stock bin, a hand hole door is arranged on the side face of each PTA feeding port, a PTA hopper is arranged below the feeding ports, and the PTA feeding ports are communicated with the hand hole door. And a PTA receiving hopper is arranged on the peripheries of the four feeding ports, a dust remover is fixedly installed above the small PTA stock bin, a cloth bag nitrogen dust removal electromagnetic valve is fixedly installed on the side face of the dust remover, and a dust removal fan is fixedly installed above the dust remover. According to the automatic negative-pressure dust recovery device for the polyester PTA feeding port, the PTA hopper and the PTA receiving hopper are arranged to recover PTA dust, compared with the prior art, falling PTA powder is recycled, resource waste is avoided, energy is saved, consumption is reduced, and meanwhile harm of the PTA dust to the working environment and personnel health is reduced.

The invention relates to the technical field of agricultural fertilizers, in particular to a functional sustained and controlled release fertilizer for regulating and controlling productivity of salinized soil and a preparation method thereof. The slow / controlled-release fertilizer is prepared by compounding a fertilizer matrix, a soil conditioner, a water-retaining agent and humic acid, wherein the fertilizer base body comprises a core material, and the surface of the core material is sequentially coated with a chelating layer and a wall material layer from inside to outside; the core material comprises the following components in parts by weight: ammonium sulfate, monoammonium phosphate, potassium sulfate and trace elements; the chelating layer is sodium ethylene diamine tetracetate; and the wall material layer is sodium alginate. The sodium alginate coating material adopted by the fertilizer can control the fertilizer to be slowly released in soil, and after the fertilizer is completely released in the soil, the adopted coated fertilizer is non-toxic and harmless in the soil and is easy to degrade. The chelating layer is arranged between the core material and the wall material and can be chelated to form a connecting structure of the inner layer and the outer layer, so that the strength of the fertilizer matrix particles is improved, the particles have stability, and the slow release effect is favorably exerted.

The invention discloses a multi-sense-in-one forestry fire automatic identification and early warning system and method, and belongs to the technical field of fire identification and early warning. The method comprises the following steps: S1, acquiring data to a system through terminal sensing equipment, and analyzing and processing the acquired data; s2, extracting characteristics related to smoke and fire from the preprocessed data; s3, building a convolutional neural network deep learning model, and performing smoke and fire identification on the real-time image or video data; s4, after the system automatically recognizes the fire sign, alarm information is sent out, and alarm point positioning information is confirmed through a positioning algorithm; and S5, judging the regional position of the alarm point based on the positioning information of the alarm point. Through the technologies of the unmanned aerial vehicle, the infrared sensor, intelligent identification and the like, forest fire can be monitored and early warned, a fire source is found in time, measures are taken to extinguish fire, and the harm of the fire to forest resources and the ecological environment is reduced.

The invention provides a quartz sand flotation method. The quartz sand flotation method comprises the following steps: grinding a quartz raw material to obtain coarse sand of 80-140 meshes; desliming and magnetically separating the coarse sand to obtain magnetically separated quartz fine sand; carrying out flotation on the magnetic separation quartz fine sand by using a flotation reagent so as to float out impurities such as gangue minerals and obtain quartz fine sand; carrying out acid leaching treatment on the quartz fine sand, and washing the quartz fine sand with pure water until the quartz fine sand is neutral to obtain high-purity quartz sand; wherein the flotation reagent comprises a GY-03 flotation reagent and a GY-04 flotation reagent; according to the method, minerals containing elements such as potassium, sodium and aluminum in the quartz raw material are removed through flotation, so that the purity of the ores is improved. And the flotation step is adopted, chloridizing roasting is omitted, and harm to the environment and the human body can be reduced.

The invention discloses a low-smoke-density high-temperature-resistant halogen-free special flame-retardant optical cable, which comprises a cable core, an inner sheath and a fireproof layer from inside to outside, and is characterized in that the fireproof layer comprises a fireproof layer made of a ceramic silicone rubber material; the cable core comprises optical fibers, a loose tube, a reinforcing piece and an internal flame-retardant thermal insulation layer, the reinforcing piece is located in the center of the cable core, the optical fibers are arranged in the loose tube to form an optical fiber unit and surround the reinforcing piece, the internal flame-retardant thermal insulation layer comprises water-blocking yarn and a calcined mica tape, and the space between the optical fiber unit and the reinforcing piece is filled with the water-blocking yarn. And the optical fiber units, the reinforcers and the water-blocking yarns are wound by the calcined mica tape in a multi-layer and multi-pitch manner. According to the invention, the ceramic silicone rubber material is adopted and is ceramized in a flame state or at a high temperature of more than 500 DEG C to form an oxygen barrier layer, so that a flashover phenomenon in the cable is prevented; ointment is removed from the structure, and the water-blocking yarn and the calcined mica tape are used for blocking water, so that smoke in the combustion process is reduced, and the harm to personnel is less under the condition of fire hazard.

The invention discloses a device and method for separating a titanium dioxide primary product and residual chlorine, the device comprises an outer cylinder, a spiral assembly and a negative pressure device, the spiral assembly is arranged in the outer cylinder; the spiral assembly comprises an inner barrel and a spiral plate, the inner side edge of the spiral plate is fixed to the outer wall of the inner barrel in a threaded mode, and the outer side edge of the spiral plate is adjacent to the inner wall of the outer barrel; a vent hole penetrating into the outer cylinder body is formed in the inner cylinder body; a first end of the inner cylinder is provided with a gas inlet, and a second end of the inner cylinder is provided with a gas outlet; and the negative pressure equipment is communicated with the gas outlet. By arranging the negative pressure equipment, matching with the vent holes and combining with a spiral stirring and conveying feeding mode, the separation efficiency can be greatly improved, and the chlorine content on the surface of titanium dioxide can be greatly reduced. And the separated chlorine gas is collected, enriched and recycled, or is absorbed by alkali liquor, so that the harm of the chlorine gas to the environment and human bodies is reduced.

The invention belongs to the technical field of domestic water, and particularly relates to a water flow charging type hot water directional circulation system which comprises a water heater, a first pipeline, a second pipeline and at least one circulation branch, a water flow power generation device is arranged on the circulation branch and comprises a water flow power generation module, a driving wheel and a power generator, and the driving wheel and the power generator are installed on the circulation branch; the energy storage module is used for storing the electric energy generated by the generator and supplying power; when the energy storage module is in a low electric quantity state, water flow formed by the circulation branch can drive the driving wheel to rotate and enable the generator to generate electricity, and the energy storage module is charged. According to the invention, weak current can be directly provided for internal electric equipment and external electric equipment through the energy storage module, so that water and electricity separation is realized, the tedious process of strong current wiring in a whole room is reduced, and the decoration cost is saved. Meanwhile, the harm of weak current to human bodies is low, and the electricity utilization safety of the toilet is guaranteed.

The invention discloses a preparation method of a three-dimensional flower-cluster-shaped CdS QDs (at) ZnS / ZnO composite photocatalyst, belongs to the field of preparation of photocatalytic materials, and aims to solve the problem of relatively low photocatalytic efficiency. The preparation method comprises the following steps: 1, preparing zinc oxide: dissolving Zn (CH3COO) 2.2 H2O in deionized water, stirring until Zn (CH3COO) 2.2 H2O is completely dissolved, adding NaOH, stirring to form an emulsion, transferring the mixed emulsion into a polytetrafluoroethylene reaction kettle, and treating at 160 DEG C for 10 hours; 2, preparation of cadmium sulfide quantum dots (CdS QDs): dropwise adding thioacetamide (TAA) into a Cd (NO3) 2.4 H2O aqueous solution, continuously stirring and dropwise adding a NaOH solution, adjusting the pH value of the solution to 10.5, then adding a Na2S solution, stirring at 65 DEG C for 1 h, cooling to room temperature, and aging for 24 h; and 3, dissolving Zn (CH3COO) 2.2 H2O and TAA in deionized water, adding ZnO powder, adding CdS QDs, and carrying out rapid stirring. Putting into a microwave reaction instrument, reacting at 160 DEG C for 45 minutes, washing and drying. The three-dimensional flower-cluster-shaped CdS QDs (at) ZnS / ZnO composite photocatalyst is prepared through a microwave-assisted hydrothermal method, and the photocatalytic oxidation performance is effectively improved.

The invention discloses sludge dredging equipment for a water conservancy project riverway, and relates to the technical field of dredging equipment.The sludge dredging equipment comprises a fixed arm, a mounting plate is fixedly connected to the front side of the fixed arm, a first supporting frame is fixedly connected to the front end of the mounting plate, a rotating shaft is rotatably connected to the interior of the first supporting frame, and an inclined block is fixedly connected to the bottom end of the rotating shaft; rotating rods are rotatably connected to one sides of the bottoms of the inclined blocks, supporting balls are fixedly connected to the outer sides of the middle sections of the rotating rods, a pushing assembly is arranged at the top end of the sliding pipe, reciprocating lead screws are arranged in the multiple rotating sleeves, upper supports are fixedly connected to the bottom ends of the supporting sleeves, and claw plates are fixedly connected to the bottom ends of the multiple reciprocating lead screws; according to the sludge dredging equipment for the water conservancy project riverway, sludge in the riverway is effectively dispersed and stirred, so that the mixing efficiency of a medicament and the sludge is improved, and the purpose of cleaning the riverway sludge is achieved.

The invention provides a preparation method of a high-expansion phosphoramidated natural polysaccharide flame retardant. The preparation method comprises the following preparation steps: S1, carrying out amination treatment on a phosphoramidated reagent to obtain a precursor solution; and S2, adding the natural polysaccharide into the precursor solution, and carrying out phosphoramidation reaction to obtain the high-expansion phosphoramidated natural polysaccharide flame retardant. According to the invention, the natural biomass is used as the raw material, and the water is used as the solvent, so that the prepared flame retardant has the advantages of high expansion rate, low environmental hazard, high matrix compatibility and excellent flame retardance. Moreover, on one hand, the flame retardant prepared by the invention has higher expansion rate and fire endurance, and on the other hand, the heat released by the flame retardant during combustion can be reduced and inhibited, so that the harm to the environment is reduced, and the practical effect of the flame retardant prepared by the invention during use is further ensured.

The invention belongs to the technical field of artificial stone, and particularly relates to a wear-resistant and super-tough artificial stone plate as well as a preparation method and application thereof. The artificial stone plate is prepared from the following raw material components: microcrystalline sand, microcrystalline powder, resin, a curing agent and a coupling agent, the microcrystalline sand and the microcrystalline powder are prepared from the following raw material components: SiO2, CaCO3, MgO, Al2O3, a fluxing agent and a nucleating agent; the nucleating agent is prepared from ZrSiO4 and CaSiF6. In the melting process of all the raw materials of the microcrystalline sand and the microcrystalline powder, a quartz crystal structure is subjected to qualitative change and is converted into an amorphous silicate microcrystalline structure, free inhalable silicon dioxide does not exist, damage and corrosion discoloration of high-sodium and strong-alkalinity raw materials to bonding resin of the artificial stone plate can be avoided, and other components of the artificial stone plate are combined, so that the artificial stone plate is prepared. The artificial stone plate does not contain crystalline silicon dioxide, has good wear resistance and toughness, and has a wide market application prospect.

The invention discloses a preparation method for preparing a silicon nitride substrate by adopting water-based tape casting silicon powder slurry in the technical field. The preparation method comprises the following steps: step 1) preparation of tape casting slurry: weighing silicon powder, an inorganic sintering aid, a dispersing agent, a water-based binder and a plasticizer; the preparation method comprises the following steps: adding a water solvent into silicon powder, carrying out ball milling, adding a water-based binder and a plasticizer into a ball milling tank, and defoaming slurry obtained after ball milling at a set vacuum degree to obtain slurry; (2) preparing a green body: carrying out tape casting on the adjusted slurry; and (3) degreasing: spraying and coating powder on the cut green body sheets of the silicon powder, stacking the green body sheets and then putting the green body sheets into a glue discharging furnace for degreasing to obtain a uniform and consistent degreased green body. And 4) sintering: transferring the degreased green body into a sintering furnace, raising the temperature to a nitriding temperature, firstly nitriding, then raising the temperature to a sintering temperature, carrying out heat preservation, and then carrying out furnace cooling to obtain the silicon nitride substrate. According to the invention, the cost is reduced on the premise of ensuring environmental protection.