74results about How to "Solve removal" patented technology

Disclosed is a method and equipment for treatment of polluted fluid, wherein ferrum family flocculating agents of a finite concentration are charged into the membrane bioreactor, in which they are subject to domestication and become compact biological ferrum sludge with improved property.

The invention discloses a mycotoxin detoxification agent for feed and a preparation method and a feed additive thereof, and belongs to the field of feed additives. The mycotoxin detoxification agent can be used for detoxification of feed raw materials and compound feed of mycotoxin polluted corn, grains and the like. The mycotoxin detoxification agent consists of modified montmorillonite, yeast cell wall, chitosan and the like; and the preparation method has simple process. The novel mycotoxin detoxification agent for feed can effectively remove pollution of multiple mycotoxins such as aflatoxin, zearalenone, T2 toxin, vomitoxin and the like in the feed raw materials and the feed of the corn, the grains and the like, and prevent various diseases of livestock and poultry because of eating the mycotoxin polluted feed. The mycotoxin detoxification agent has simple preparation process, stable and controllable quality, convenience in use and low price, meanwhile has the advantages of supplementing nutrients, improving the disease resistance of cultured animal bodies and avoiding adsorbing nutrient elements in the feed, and guarantees the health and safety of the cultured animals.

The invention discloses a sectored multi-step ecological buffer type revetment system. The revetment system is provided with at least four levels of steps, blocking walls are sequentially arranged on the outer sides of the steps, one plant planting zone is arranged in the blocking wall of each level, soil matrix is arranged in the upper layer of each plant planting zone, yellow sand, ceramsite, soft rock and zeolite are sequentially in the lower layer of the plant planting zone of each level, and emersed landscape plants and submergence-tolerant plants are arranged in the plant planting zone of each level; hydraulic drop platforms are sequentially arranged in the corresponding positions of spaced plant planting zones of the blocking walls; and one guide plate is arranged between each blocking wall and the corresponding hydraulic drop platform; the plant planting zone of the first level is connected with a farmland drainage canal and is sectored towards the downstream to form a hydraulic-drop type hierarchical structure in an open sectored shape, the sector radius is 5-8 m, and the central angle is 45 degrees-75 degrees; and the blocking wall of the last level is connected with a river channel. The sectored multi-step ecological buffer type revetment system not only has the efficacies of protecting river channel side slope, and realizing flood water drainage and water and soil conservation, but also has good purification and landscape effects.

The invention relates to a horizontal underflow constructed wetland capable of strengthening denitrification at a low temperature. The constructed wetland consists of a water distribution region, a filling region, an aeration device, a water collecting region and wetland plants, wherein large-grain detritus is positioned in the water distribution region and the water collecting region; the filling region is arranged between the water distribution region and the water collecting region; medium-grain detritus, medium-grain zeolite and fine-grain detritus are positioned in the filling region sequentially; and aeration pipes are laid on the bottom layer of a zeolite segment and the aeration quantity is adjustable. Sewage is subjected to pretreatment, so that suspended matters and part of pollutant are removed, and then the sewage is subjected to constructed wetland purification treatment. The horizontal underflow constructed wetland can greatly improve the dissolved oxygen concentration of the sewage and the ammonia nitrogen adsorption capacity of regenerated zeolite in the horizontal underflow constructed wetland and can maintain high-efficiency and stable nitrogen removal rate of a system.

The invention discloses a feature-combined optical satellite image cloud and cloud shadow detection method. Through processes such as spectrum filtering, local optimization and object-based filtering, spectrum, geometry and texture features of cloud and cloud shadow are combined to extract the cloud and cloud shadow from an image. The method takes multiple features of the cloud and cloud shadow in the image into consideration, utilizes existing image information to the maximum, and achieves quick and accurate estimation of cloud coverage and precise detection of cloud and cloud shadow positions in an optical satellite image. The detection is high is precision and fast in speed. The method is high in extensibility and practical value.

The invention provides a surface preprocessing method for laser welding of an aluminum alloy. The method is characterized by comprising the steps of 1) performing surface texturing treatment on an area, to be welded, of the aluminum alloy through short-pulse laser with energy density of I1, thus forming a regular ripple microstructure; and increasing the surface roughness of the area, to be welded, of the aluminum alloy, wherein the I1 is more than the burning loss threshold Ia of the aluminum alloy; 2) cleaning the surface of the area, to be welded, of the aluminum alloy through the short-pulse laser with the energy density of I2; removing polluting matters on the surface of the microstructure of the area, to be welded, of the aluminum alloy through the short-pulse laser with energy density of I2 so as to remove pollutants on the surface of the microstructure of the area, to be welded, of the aluminum alloy; and increasing the surface cleanness of the area, to be welded, of the aluminum alloy, wherein the I2 is more than the washing threshold Ic of the aluminum alloy and is less than the burning loss threshold Ia of the aluminum alloy; and 3) starting to weld the aluminum alloy within 30min. With the adoption of the method, two major problems that the reflectivity of the aluminum alloy surface to to laser is high, and a surface oxide film is hard to remove, can be synchronously solved; and the forming quality of a weld joint of the aluminum alloy is obviously improved.

The artificial leather effluent treating process has different treating steps for different kinds of effluent with different COD and DMF concentrations. Effluent with high COD and DMF concentration is first treated in a DMF recovering system to recover DMF, then anaerobic treated and blown to eliminate generated ammonia nitrogen, and finally mixed with other low COD concentration effluent and further treated anaerobic/aerobic + coagulating precipitation process to reach the draining standard. The process has high treating effect, especially on high DMF content effluent.

The invention discloses a terahertz coaxial holographic imaging system and an imaging method based on multiple recording distances. The invention particularly relates to an iterative reproduction method based on multiple recording distances and belongs to the technical field of the terahertz imaging technology. The invention aims to solve the problem of conjugate images and the zero-level image interference during the terahertz coaxial digital holographic imaging process. The imaging includes two processes: namely hologram recording and complex amplitude reproducing. During the hologram recording process, a hologram of multiple recording distances and the acquisition of the illumination light are realized through horizontally moving a detector along the direction of an optical axis. During the complex amplitude reproducing process, the complex-amplitude diffraction propagation is respectively conducted for the hologram and the illumination light sequentially between every two recording surfaces, and the recording value of each recording surface is updated as a constraint condition for the complex amplitude. The phase information of the hologram and the illumination light is restored through the repeated round-trip iteration operation. Finally, the high-fidelity object surface complex-amplitude distribution without conjugate images and the zero-level image interference can be obtained.

The invention discloses a method for removing the boron and phosphorus impurity in industrial silicon by slagging refining, and relates to the industrial silicon impurity removal technology. The method comprises the following steps of: 1) coating a compact SiC coating as an inner layer on the surface of a graphite crucible, and coating a Y2O3 coating on the SiC coating as an outer layer; 2) after slagging constituent is mixed, putting into a pre-processed graphite crucible; 3) opening a medium-frequency induction furnace for heating until slag charges are molten; 4) after the slag charges are molten, adding the industrial silicon into the molten slag charges, carrying out slagging refining, and reacting if power is lowered after the slag charges and silicon materials are totally molten; 5) inserting a venting pin into the molten liquid, and introducing Ar+H2O into the system to guarantee that the silicon and the slags are contacted; 6) pulling out the venting pin, and pouring the upper layer of silicon liquid of the molten liquid into a standing graphite module for cooling; 7) continuously adding silicon materials, and repeating steps 4) to 6); and 8) cutting impurity enrichment parts on the tail part and the head part of refined polysilicon, and measuring the content of residual parts of boron and phosphorus by ICP-MS (inductively coupled plasma-mass spectrum). The method has the advantages of simple technology and high industrial feasibility.

The invention discloses a device and method for treating sewage with a low ratio of carbon to nitrogen. The device is formed by sequentially connecting a biochemical treatment unit, a magnetic anion exchange resin treatment unit, a contact filtering unit and a disinfecting unit by pipelines in series. According to the method for treating the sewage with the low ratio of the carbon to the nitrogen, the sewage with the low ratio of the carbon to the nitrogen is highly treated through steps of biochemical treatment, ion exchange, contact filtering, disinfection, discharge and the like. The device and the method for treating the sewage with the low ratio of the carbon to the nitrogen, disclosed by the invention, not only is low in technical cost and good in total nitrogen removing effect, but also remarkably strengthen an effect for removing organic matters and suspended matters so as to fully meet the requirement on water quality.

It relates to the dual voltage peak valve retaining driving circuit. It uses parallel dual voltage drive. The low end drive circuit keeps conducting when the control pulse arrives, high end drive circuit conducts with the rising of control pulse, cutting off the flow limit circuit made of simple separated units when the drive current reaches preset peak valve, and the electromagnetic drive circuit entering into the only existing low end drive circuit retaining stage. With bleed resistance on the low end drive circuit, it can solve the problem of instant unable to follow up of the low end drive circuit with the leakage of electromagnetic valve and high end electric circuit with instant cut off of the electromagnetic valve. On the after-flow of the electromagnetic valve, adopting parallel voltage sensitive resistance to get rid of the sensing voltage peak occurring at the instant of the electromagnetic valve cut-off, it not only get rid of the sensing voltage peak, but also ensures the cut-off speed of the valve. It is quick, endurable and extensively applicable.

The invention relates to a cutting path planning method applied to a folded waveguide slow wave structure. The cutting path planning method comprises the following steps: removing oxide scales on thesurface of a material by adopting a milling cutter; selecting a point, positioned outside the starting edge of an S-shaped groove, on a center line of a straight groove as a cutter adjusting point; performing Z-direction cutter adjustment on a workpiece by adopting a CCD cutter adjusting system; dividing the processing stage, planning a cutting path of a micro-milling cutter and adopting a cuttingplan for layered processing of the slow wave structure in the depth direction; finally removing residual burrs through an auxiliary process. The cutting path planning method provided by the inventionhas the benefits that the ultra-precision micro-milling process of the multi-period, large-aspect ratio and thin-walled complex slow-wave structure is realized, and the problems that in the ultra-precision micro-milling process of the part, an island structure is prone to bending and collapsing, the burrs formed at the intersection of the straight groove and the S-shaped groove are hard to remove, the side wall of a deep groove is easy to incline and the like are solved, to meet the relatively stringent processing requirements.

The invention discloses a bend forming method of a large-angle pipeline with high precision, a large pipe diameter and a small bending diameter ratio, and belongs to the technical field of machining. Metal or alloy materials with the low melting temperature are machined to be a core rod, the core rod is assembled into an inner hole of the large pipeline to be bent, the large pipeline and the core rod are simultaneously bent through bend forming, pipe blank which is subjected to bend forming is heated to be at the temperature higher than the melting temperature of the alloy core rod, at a certain temperature below the AC1 temperature of a bent pipe material (or the heating temperature at which the performance of the pipe blank material can not drop obviously), a core rod material in the bent pipe is molten and flows out, and the large bent pipe with the bent section ovality being small, the inner hole surface being smooth and the inner arc being capable of not wrinkling is acquired. The bent pipe low-melting-point core rod technology is suitable for the bend forming of the large-angle pipeline which is high in forming precision requirement, thick in wall, large in pipe diameter and small in bending diameter ratio.

The invention belongs to the technical field of catalysts and especially relates to a preparation method for an efficient load type ozone oxidation catalyst. The preparation method for the efficient load type ozone oxidation catalyst provided by the invention comprises five processes of preparing a titanium sol solution, preparing a template agent sol solution, preparing a mesoporous titanium dioxide molecular sieve precursor, de-molding the mesoporous titanium dioxide molecular sieve precursor and loading a MnO2 active component. According to the invention, a self-prepared mesoporous titanium dioxide molecular sieve is used as a carrier, a Mn metallic oxide catalyst is loaded into an inner pore structure of a titanium molecular sieve, the molecular sieve is composed of active components, the content of the active components in the catalyst material is ultrahigh, the removal rate of the pollutants is high, the catalytic activity is high, the active component loss is less and the catalyst has an obvious catalytic effect in ozone oxidation treatment for antibiotic wastewater, such as, chloramphenicol wastewater, penicillin wastewater, erythrocin wastewater, streptomycin wastewater, vancomycin wastewater and pipemidic acid wastewater.

The invention discloses a ZIF-based nitrogen-doped porous carbon material and a preparation method thereof. The preparation method comprises the following steps of: loading a polydopamine film by taking solid spherical calcium carbonate as a template agent and a pore expanding agent, growing zeolite imidazole matrix crystal ZIF-8 on the surface through induce to obtain nitrogen-contained precursorCaCO3@PDA@ZIF-8, carbonizing at high temperature and washing with water to obtain the hollow spherical ZIF-based nitrogen-doped porous carbon material S-NGPC-ZIF-8. In the high-temperature carbonization process, the calcium carbonate in the composite material CaCO3@PDA@ZIF-8 not only plays a role in supporting the appearance, but also has a high-efficiency reaming effect due to CO2 released by high-temperature decomposition, and the evaporation of ZIF-8 crystal zinc ions also plays a role in secondary reaming in the pyrolysis process, the method not only solves the problems that a prior template agent is difficult to remove, the appearance is easy to collapse and the like, but also avoids the introduction of a polluting reaming agent.

The invention relates to a device and technique for purifying and processing titanium white waste acid. The device comprises a separating pot, a sealing cover, a filter core, a connector, a porous plate, supporting rings, an inclined plate and an inclined plate partition plate, wherein the separating pot and the sealing cover are fixed by a sealing ring; the sealing cover is provided with a clear solution outlet; the separating pot is of a structure with shaped cylindrical upper part and a conical lower part; the bottom of the cone is provided with a solution outlet; a material solution inlet is arranged below the cylinder; the three supporting rings are arranged from top to bottom in the separating pot; the porous plate provided with the inclined plate is arranged on the lower supporting ring; the middle supporting ring is arranged on the inclined plate and provided with the porous plate which is provided with the filter core; the upper part of the filter core is arranged on the upper supporting ring; and the water outlet of the filter core is connected with the clear solution outlet by the connector. A material solution is configured to form a rotational flow after entering the separating pot, a part of particles sink directly, the liquid flows upwards by the porous plate, a large amount of particles are settled by the inclined plate firstly, the particle impurities are removed by the filter core, the clear waste acid solution is obtained by the collection at the clear solution outlet, and the accumulated particles and powder are discharged by a solution discharge opening.

The invention discloses a two-ion modified biological adsorbent. A preparation method of the two-ion modified biological adsorbent comprises the following steps: (1) carboxylation of a biological adsorbent: modifying the adsorbent by using an anhydrides compound under an anhydrous condition, and grafting a large number of carboxyl groups to the surface of the biological adsorbent; (2) amination of the biological adsorbent: under the effect of an N, N'-dicyclohexylcarbodiimide (DCC) condensing agent, grafting a poly-amino compound on the surface of the biological adsorbent after carboxylation through a condensation reaction of amine groups and the carboxyl groups, and controlling the adding amount of DCC and the amine groups to prepare the two-ion modified adsorbent with different ratios of the amine groups to the carboxyl groups. The two-ion modified biological adsorbent is prepared by using the simple method, and heavy metal anions and heavy metal cations in a water body can be effectively adsorbed at the same time, so that the problem that the heavy metal anions and the heavy metal cations in the water body cannot be removed by a single functional group modified adsorbent at the same time is solved, and meanwhile, a new way for removal of the heavy metal anions and the heavy metal cations in waste water at is provided.

The invention discloses a microbial agent for live pig breeding wastewater treatment as well as a preparation method and application of the microbial agent. The microbial agent comprises rice husks, biogas residues, calcium oxide and enzyme microorganisms in a certain ratio. The microbial agent comprises the following steps: (1) putting the biogas residues into a pressure cooker, and cooking; (2) uniformly mixing the rice husks and the enzyme microorganisms, and naturally heaping up for fermenting; (3) adding products obtained in the former steps into the calcium oxide, uniformly mixing and performing secondary fermentation to prepare the special microbial agent for the live pig breeding wastewater treatment. The microbial agent is applied to the live pig breeding wastewater treatment. The preparation method is feasible, and easy and convenient to operate; the rice husks after the secondary fermentation contain polysaccharide, crude fat, crude protein and other nutritional substances, can provide necessary nutritional components for microbes, have relatively strong synchronous decarbonizing and denitrogenating effects, and have strong anti-interference capability; according to the preparation method, the problems that in the prior art, certain organic matters, phosphorus, nitrogen and other soluble pollutants cannot be effectively removed and the like are solved, and the first-level B standard of the national urban sewage discharge standard is reached.

The invention provides an automobile body punching and grinding device, and relates to the field of grinding devices. The automobile body punching and grinding device comprises a supporting mechanism,wherein a pushing plate mechanism is fixedly mounted on one side of the supporting mechanism, a punching mechanism is fixedly mounted above the supporting mechanism, a rotating mechanism is fixedly mounted on above the supporting mechanism and located on one side of the punching mechanism, the supporting mechanism comprises a supporting frame, a punched hole is provided in the center of the uppersurface of the supporting frame, a supporting plate is fixedly mounted on one side of the supporting frame, the supporting frame is fixedly mounted at the rear end of the supporting frame, and the supporting frame is extended above the supporting frame. According to the automobile body punching and grinding device, a punching head is used for achieving punching through working of a first motor, rotation of a grinding tool can be achieved under the action of a pushing plate, the effect of removing a deformation material through a grinding blade can be achieved under the action of a second motor, a driven gear and a driving gear, and the problem that secondary positioning is required when the deformation material is removed is solved.

The invention particularly relates to a method for preparing a foam ceramic by using industrial and mining, building and sludge residue as raw materials, and belongs to the technical field of environmental-protection foam ceramics, wherein protein foaming agent preparing, foam slurry preparing, molding and curing, high-temperature sintering, and detecting and packaging are performed to prepare thefoam ceramic. According to the present invention, the molded and cured foam slurry is conveyed to the tunnel kiln using liquefied petroleum gas as the fuel, and then enters the high temperature section through the sintering device, such that the two composite heating modes are innovatively connected in series so as to save the energy consumption or the fuel cost by 15-30%, and the technical problem that heavy metals, dioxins, and other organic pollutants cannot be completely removed during the combustion of industrial and mining, building and sludge residue is fundamentally solved; and the foam ceramic prepared through the method is the novel building material, and can have excellent performances of hydrophobicity, fire resistance, sound resistance, heat insulation, high compressive strength, acid resistance, alkali resistance, no aging, less deformation and the like according to the opened and closed gaps of the foam.

The invention provides an easy-to-clean spraying-free polypropylene material and a preparation method thereof. The easy-to-clean spraying-free polypropylene material is prepared from the following rawmaterials in parts by weight: 70-90 parts of low-viscosity polypropylene resin, 10 to 30 parts of high-viscosity polypropylene resin, wherein the weight parts of the low-viscosity polypropylene resinand the weight parts of the high-viscosity polypropylene resin sum to 100 parts, 0.5 to 1 part of an antioxidant, 0.5 to 1 part of a lubricating agent and 1-5 parts of easy-to-clean metal toner master batch. The preparation method comprises the following steps: mixing the low-viscosity polypropylene resin, the high-viscosity polypropylene resin, the antioxidant and the lubricant by using a high-speed agitator, and adding the obtained mixture into a double-screw extruder through a main feeding port; adding the easy-to-clean metal toner master batch into the double-screw extruder through a sidefeeding port; and then performing melt extrusion and granulation to obtain the material. The easy-to-clean spraying-free polypropylene material has excellent mechanical properties, processability andeasiness in cleaning, and can be applied to the fields of automobiles and household appliances such as automobile exterior trim, air conditioner decoration strips, exterior decoration structures of small household appliances and the like.

The invention relates to a mineral mycotoxin mold-removing agent and a preparation method thereof. The mineral mycotoxin mold-removing agent is characterized by comprising components of raw materials by weight as follows: 60%-70% of modified montmorillonite, 10%-20% of modified halloysite, 5%-15% of tourmaline, 5% of vitamins and 5% of minerals. According to the preparation method, the modified montmorillonite and the modified halloysite are compounded, so that efficient adsorption and selective adsorption of mycotoxin can be realized, that is, very few various nutrients are adsorbed while mycotoxin is adsorbed efficiently; with addition of the tourmaline, surface tension of water can be reduced, absorption and utilization of animals for nutrients are promoted, microcirculation of the animals is regulated and controlled, and residual mycotoxin in animal tissue is reduced.

The invention discloses an electrochemical polishing device. The device comprises a wafer chuck and a nozzle. The wafer chuck is provided with multiple wafer grooves. The multiple wafer grooves are uniformly distributed between the circle center of the wafer chuck and the outer edge of the wafer chuck. The diameters of the wafer grooves are equal, circle centers of the multiple wafer grooves are distributed on the concentric circles utilizing the wafer chuck circle center as a center, and the circle centers of the wafer grooves are located on the midpoint of the radius from the wafer chuck circle center to the outer edge of the wafer chuck. The wafer chuck carries out linear movement relatively to the nozzle. The invention also provides an electrochemical polishing method utilizing the electrochemical polishing device. The used electrochemical polishing device comprises the wafer chuck and the nozzle. In wafer polishing, the wafer chuck clamping multiple wafers carries out linear movement relatively to the nozzle and the movement range is from the wafer chuck circle center to the outer edge of the wafer chuck or is in a wafer groove diameter range.

The invention discloses a method for determining the content of impurity elements in highly-pure bismuth. HCl gas volatilization is adopted to remove a bismuth main body in order to solve the problemsof main body interference and difficulty in removal of the main body; bismuth reacts with a hydrogen chloride gas to generate bismuth trichloride, and volatilization removal is carried out, so a bismuth matrix is effectively removed without introducing new impurity elements, and the background interference of the main body element is effectively avoided, thereby the main peaks of elements to be measured are significant, the sensitivity is increased, and the reappearance is high. The analysis method used in the invention has the advantages of realization of simultaneous determination of multiple elements, convenience in operation, fast analysis speed, shortening of the analysis period, improvement of the analysis efficiency, and reduction of the labor intensity of analysis operator. A determination result obtained by using the method for determining the content of the impurity elements in the highly-pure has good stability, good reappearance and good accuracy. Test proves that the method is reliable and practical, and can meet the requirements of the detection of the content of the impurity elements in the highly-pure bismuth used for production and researches.

The invention belongs to the technical field of wastewater treatment, and discloses a Fenton optimization oxidation treatment method for wastewater. According to the treatment method, organic mattersin the wastewater can be degraded in a targeted manner by controlling the adding points, the adding amounts and the pH adjusting points of hydrogen peroxide and ferrous sulfate. The treatment method is simple to operate, can enable the Fenton reaction to be carried out in more forward treatment directions, reduces the dosages of hydrogen peroxide, ferrous ions, early-stage acid regulation and later-stage alkali regulation, improves the utilization rate of drugs, reduces the treatment cost, enables the Fenton reaction to be more thorough, and further solves the problems of large dosage and poorremoval effect during optimization of waste liquid treatment.

The invention relates to an adsorbent and application thereof to wool dyeing wastewater recycling technology, and aims to provide the adsorbent for the wool dyeing wastewater recycling technology. The adsorbent has high acid and metal ion absorption capacity, low cost and low running cost, and is simple to operate and easy to treat after being used. Experiments on the absorption of acid and metal ions by adopting industrial waste cinders and coal ash as the adsorbent effectively solve the problem of removal of the acid and metal ions in the wool dyeing wastewater recycling technology. The adsorbent can absorb acetic acids, formic acids, sulfuric acids, oxalic acids and citric acids in an amount which is 50 to 400 percent of that of corresponding acids absorbed by activated carbon, is at the same level of absorption of chromium ions, iron ions and copper ions as the activated carbon, differentiates the color of a dyed material from that of the dyed material dyed by fresh water by more than 4 levels and simultaneously saves the using amount of the fresh water, so that the aim of recycling wool dyeing wastewater in dyeing processes after the wool dyeing wastewater is treated by the recycling technology can be fulfilled.

The invention provides an internal circulation type sewage treatment oxidation ditch, belonging to the technical field of sewage treatment. The internal circulation type sewage treatment oxidation ditch of the invention overcomes the problems that conventional oxidation ditches are poor in nitrogen and phosphorus removal effect and low in effluent discharge standard, and effectively improves removal efficiency of chemical oxygen demand. The internal circulation type sewage treatment oxidation ditch comprises an anaerobic zone, an anoxic zone, an aerobic zone and an internal circulation controlgate, wherein the anaerobic zone is connected with the anoxic zone, and a water inlet is formed in the joint of the anaerobic zone and the anoxic zone; the anoxic zone is connected with the aerobic zone, and a circulation channel and a backflow channel are formed in the joint of the anoxic zone and the aerobic zone; and the internal circulation control gate is arranged on the backflow channel. The internal circulation type sewage treatment oxidation ditch is mainly used for sewage treatment.

The invention discloses a single-lead ECG signal PQRST wave joint precise recognition algorithm, wherein the algorithm includes the steps: when inputting a single-lead signal, preprocessing the signalwith a wavelet analysis method, filtering out a noise signal and adjusting the baseline drift of the ECG signal; according to the preprocessed signal, calculating to obtain an R wave peak position ofthe ECG signal by a difference method; according to the R wave peak position and an RR interval, intelligently locating each heartbeat period, and segmenting the ECG signal according to the heartbeatperiod; for the segmented ECG signal, calculating and determining Q wave and S wave positions by a self-adaptive method; and for the segmented ECG signal, recognizing and determining the P wave and Twave peak positions by a convolution method. The PQRST wave recognition method includes recognition of the PQRST wave peaks, the intervals between the waves and the wave-wave interval between different ECG signal segments. The algorithm realizes the recognition of various waves and interval features of the single-lead ECG signal, and provides reliable features for application of the ECG signal classification algorithm by the machine learning method.

The invention discloses a high-density aquaculture oxygenation purification method and system. The method comprises the following steps of producing ozone through an ozone generator, producing singlet oxygen through a singlet oxygen generator, producing hydrogen peroxide through a hydrogen peroxide generator, respectively inputting the ozone, the singlet oxygen and the hydrogen peroxide in a gas-water mixer through a metering pump, inputting aquaculture water to be treated in an aquaculture water pipeline in the gas-water mixer through a pipeline, and conducting gas-water mixing under 3-5 barometric pressure; leading the aquaculture water after treatment of the gas-water mixer in the aquaculture water pipeline; and enabling quantity of the aquaculture water treated by the gas-water mixer to be 10-15% of the total of the aquaculture water. The high-density aquaculture oxygenation purification method and system can improve water sterilizing effects, efficiently improve water dissolved oxygen and achieve mariculture on the base of obtaining using effects of the ozone in the aquaculture industry. Through optimization design of a gas-water mixing mode, cost is substantially reduced, and oxygenation purification requirements of an aquaculture environment with high density and small water are met.

The invention provides an improved range hood and belongs to the technical field of kitchen electric appliances. The improved range hood comprises a machine shell, at least one refrigerating mechanism, an evaporating mechanism and a water accumulating cup. The refrigerating mechanism is installed on the machine shell. The evaporating mechanism is used for evaporating condensed water to the outside. The water accumulating cup is used for receiving the condensed water generated by the refrigerating mechanism and sending the condensed water into the evaporating mechanism. The improved range hood has the beneficial effect that the condensed water can be automatically removed.