34results about How to "Achieve governance effect" patented technology

The invention relates to a method for improving growth performance of lawn plants by adopting rare earth lanthanum. The method comprises the following steps of: soaking seeds of lawn plants with lanthanum nitrate water solution at a concentration of 50mg.L<-1>-300mg.L<-1> for 18-24 hours; then sowing the seeds in a culture dish with filter paper spread, and putting the culture dish with the sowed seeds in the sun to germinate the seeds; beginning recording the germination number 2-3 days after sowing the seeds; and after grass seed growth ends, cutting off the plants at ground level with scissors, measuring the fresh weight of the single plant and the total fresh weight, drying the samples in a drying box at 80 DEG C for 8 hours, and measuring each index. Adopted to soak the seeds, the rare earth lanthanum has an influence on germination and initial growth of Lolium perenne L. and Festuca arundinacea.L, has an effect on promoting germination of the two grass seeds, and has an obvious effect on promoting growth of the underground root system parts. Therefore, the research results show that the rooting degrees and green degrees of the grass seeds on the lawns are regulated to achieve the best effects by soaking the seeds with the rare earth element.

The invention relates to the technical field of municipal administration, in particular to a cleaning device capable of cleaning floating objects in a river channel conveniently for municipal use. Thecleaning device capable of cleaning the floating objects in the river channel conveniently for municipal use solves the technical problem that floating garbage in the river channel is difficult to clean. The cleaning device capable of cleaning the floating objects in the river channel conveniently for municipal use comprises a floating box, the top of the left side of the inner wall of the floating box is connected to the top of a rotating rod through a bearing, a sealing block is connected to the bottom of the floating box, and the bottom of the rotating rod sequentially penetrates through the bottom of the floating box and the bottom of the sealing block and extends below the bottom of the sealing block. The cleaning device cleaning the floating objects in the river channel convenientlyfor municipal use drives the floating box to move freely by the rotation of a propeller, thereby facilitating cleaning of the floating objects in a wide range and then driving the floating objects onthe surface of the river channel to the river bank by the rotation of rotating blades, so that the purpose of convenient cleaning is achieved, moreover, a traditional manual salvage method is replaced, and the work efficiency is improved.

The invention provides a paraplesia cutting seedling raising and planting method which comprises the step of seedbed settling, soil scarifying and fine grinding, weed removing, bio-organic fertilizer adding, and bio-organic fertilizer and surface layer soil even mixing and further comprises the following five steps of cutting shoot selecting, cutting pretreatment, cutting, ecological bag seedling raising and planting. According to ecological bag seedling raising, an ecological bag is filled with seedling raising soil, and a rooted paraplesia seedling with a soil ball is transplanted into the ecological bag to be cultivated for one to two months. According to the paraplesia cutting seedling raising and planting method, the technology of combining land cutting and ecological bag cultivating is adopted, the survival rate and the preserving rate of paraplesia planting are increased, the cultivated ecological bag seedling is a whole-root seedling and provided with the soil ball, the root is not damaged in the planting process, and the survival rate of planting reaches more than 90 percent. It is shown by a field test in a black river village in the Maixi village of the Zoige county, the survival rate obtained after a paraplesia cutting bare-rooted seedling is planted is 72 percent, the preserving rate obtained after one year is 56 percent, and according to the paraplesia cutting seedling raising and planting method, the paraplesia planting survival rate is 95 percent, and the preserving rate obtained after one year is 88 percent.

The invention discloses a gel bead with antibacterial and formaldehyde removal functions and belongs to the field of indoor waste gas treatment. The gel bead comprises a spherical gel bead core, functional hydrogel coating the gel bead core and a crosslinking agent, wherein the functional hydrogel is prepared from components in parts by weight as follows: 10-16 parts of a photocatalyst, 5-10 partsof nano-silver, 20-30 parts of gel, 5-10 parts of natural pigment, 10-15 parts of plant essential oil and 3-5 parts of an emulsifier. The gel bead core is made of at least one of materials includinggraphene, bentonite, volcanic ash and chitosan. The gel bead has the advantages of slow release function, long acting time and good waste gas removal effect.

The invention provides a method for improving water quality by using plant-microbe coupled ecological floating islands. The method is characterized in that self purification capacity of a water ecosystem is promoted by constructing a plant-microbe coupled bio-community. The method comprises the following steps: an ecological enclosure is arranged along a river channel coast, so that the exchange rate between coastal water body and an open water area is reduced; a composite ecological floating island is arranged, and aquatic plants are planted on a floating bed; elastic three-dimensional filleris suspended under and around the floating bed; and an immobilized compound water purification agent is added to the root of the aquatic plants. According to the method, the repairing effect is obvious, the maintenance is convenient, and secondary pollution to water body is not caused during the treatment process; and the method is especially suitable for water body treatment of water flowing river channels with cement revetment.

The invention relates to an underground water artificial recharge suspended matter blocking treatment method based on air flow circulation and belongs to the technical field of underground water artificial recharge. A gas injection pipeline is preset at the position of certain depth of an infiltration medium, gas is injected into the lower portion of the medium through a gas pump, a surface blocking layer of the infiltration medium is damaged under the power effect generated by upward movement of the gas, and suspended particles reserved in the medium are brought to the outside of the medium. The suspended particles and the infiltration medium are completely separated under a water flow scouring effect. The method has the advantage that the surface blocking layer of the medium can be cleared, and a certain amount of suspended particles in the medium can also be cleared when underground water artificial recharge suspended matter blocking treatment is conducted, and a good treatment effect is achieved. The method is high in automation degree, low in cost and less in time consumption.

The invention discloses a harmonic generation and governance simulation device and a control method of the harmonic generation and governance simulation device. The harmonic generation and governance simulation device comprises a host machine, a control screen, a waveform display screen, a synthesis wave display screen and a harmonic knowledge show screen, wherein the control screen is respectively connected with the waveform display screen and the harmonic knowledge show screen through the host machine, the synthesis wave display screen is connected with the waveform display screen through the host machine, the synthesis wave display screen is used for displaying synthesized waveforms of each waveform in the waveform display screen, a harmonic governance press button is arranged on the harmonic knowledge show screen, and the harmonic governance press button is used for triggering a harmonic governance scheme so that governed waveforms can be displayed in the synthesis wave display screen in a simulation way. Through triggering the harmonic governance press button, the harmonic knowledge show screen can give out real-time reverse waveforms in the simulation way, and the reverse waveforms are output into the synthesis wave display screen so that the waveforms become sine waves, so a harmonic governance effect is reached, when the equipment is adopted, a plurality of oscilloscopes and filters which are required to be used in the prior art are replaced, the cost is reduced, the use is convenient, and in addition, the use process is simpler.

The invention relates to the technical field of environmental protection equipment, in particular to a municipal garden soil treatment device, which comprises a liquid injection component, wherein theliquid injection component is mounted on a bracket connected with a machine shell in a rotary manner; the liquid injection component comprises a plurality of liquid injection heads, push plugs and arotary disc; a storage cavity is formed in the inner side of the rotary disc; the storage cavity is communicated with an empty cavity formed in the inner side of the bracket through a rotary joint; aplurality of the liquid injection heads are axially arranged on the rotary disc, and the liquid injection heads are inserted into a movable groove formed in the rotary disc and are connected with themovable groove in a sliding manner; the push plugs penetrate through a connecting arm of the movable groove and the storage cavity and are abutted with the liquid injection heads; and springs for resetting are sleeved outside the push plugs positioned in the movable groove. When the liquid injection heads are abutted against the soil, the liquid injection heads move to the inner side of the movable groove under the action of soil resistance, so as to push the push plugs to move, and a treatment liquid inside the storage cavity enters the liquid injection heads and enters the soil through the liquid injection heads to realize the effect of soil treatment.

The invention discloses an integrated process and equipment for eutrophic water body control. The process comprises multiple stages of fast filtering work procedures, a strong oxidation work procedure and a deep adsorption work procedure, wherein the multiple stages of fast filtering work procedures operate in a serial connection way. Suspended substances and algae cells in the water body can be fast filtered; phycotoxin, nitrogen and phosphorus nutrients and organic contaminants can be effectively removed; meanwhile, the effect of improving the water body dissolved oxygen can be achieved, so that the control effect of resolving the current problems and eliminating the root causes is achieved. In addition, through technology integration, the developed equipment is portable and intensive; the moving and the transportation are convenient; the process and the equipment are particularly applicable to the prevention and the emergency treatment of slight eutrophic water body algae bloom in urban view and scape lakes, medium-and-small-sized reservoirs and semi-sealed gulfs.

The invention provides an in-situ water body remediation material adopting natural minerals. The in-situ water body remediation material adopting natural minerals is prepared from raw materials as follows: volcanic ash, dolomite, clinoptilolite, rock-forming minerals and clay minerals with high ion substitution capacity. The prepared in-situ water body remediation material adopting the natural minerals can be completely applied to pollution treatment of rivers, lakes and other water bodies and can decompose pollutants in various water bodies and notably reduce the turbidity. Green algae, red tide and eutrophication of the water bodies are effectively prevented, the water quality and the habitat environment of aquatic organisms are improved, the biodiversity is kept to the greatest extent,and the in-situ water body remediation material has the characteristics of being energy-saving, environmentally friendly, remarkable in effects, free from secondary pollution, capable of taking effectrapidly, wide in application range, convenient to use and free from restriction by environmental conditions.

The invention relates to the field of agricultural equipment, and discloses an intelligent agricultural soil treatment machine. The machine comprises a bearing bracket, a processing mechanism, a poking mechanism and a rolling mechanism, a walking mechanism is arranged at the bottom of the front end of the bearing support. A storage box is arranged at the top of the front end of the bearing bracket; the processing mechanism is mounted at the top of the rear end of the bearing bracket; a connecting bracket is arranged at the bottom of the rear end of the bearing bracket; the connecting support is of an L-shaped structure, and the top end of the connecting support is fixedly connected with the bearing support. The poking mechanism is mounted on the connecting bracket; a guide wheel is arranged at the rear end of the connecting bracket; the rolling mechanism is mounted on the poking mechanism and is positioned between the poking mechanism and the guide wheel; according to the soil treatment machine, soil and liquid medicine can be mixed, the soil remediation effect can be achieved without centralized collection and repeated transfer of the soil, the soil at different depths can be stirred and treated according to needs, and the practicability of the equipment is improved.

The invention relates to an indoor simulation test device for studying impact of piping on a tunnel and grouting control. The indoor simulation test device comprises a model box, a tunnel lining model, a piping simulation device, a grouting simulation device, a plurality of strain gauges, a displacement gauge bracket and a plurality of displacement gauges. The tunnel lining model is of a segmented hollow aluminum tube, the piping simulation device consists of a plastic film filled with sand, and the occurrence of a piping permeation phenomenon is simulated by injecting a certain volume of water solution. The grouting simulation device consists of a grouting pipe and a grouting device which are arranged at the two ends of the piping simulation device, wherein the plurality of strain gauges cling to the outer wall of the tunnel so as to measure the strain of the tunnel; the displacement gauges are fixedly arranged on the displacement gauge bracket so as to measure a soil body at the upper part of a tunnel model and tunnel settlement. The indoor simulation test device provided by the invention aims at studying the impact of a piping phenomenon on the tunnel and grouting control, and is of great reference value for formulating a technical standard of tunnel construction safety crossing and piping phenomenon control.

The invention discloses drug-loaded vitamin B12 derivative self-assembled nanoparticles and a preparation method and application thereof. A drug and phenylalanine dipeptide are dissolved in hexafluoroisopropanol respectively to obtain a solution A and a solution B; a vitamin B12 derivative shown in the formula I is dissolved in hexafluoroisopropanol to obtain a solution C; an organic solvent or a solution thereof is mixed with the solution A evenly to obtain a solution D; the solution B and the solution C are mixed evenly, then added into the solution D and mixed evenly to obtain a solution E; the solution E is mixed evenly with water, and then PEG 200 is added into the solution to be mixed evenly to obtain a solution F; freeze drying is conducted, water is added for resuspending, and the drug-loaded vitamin B12 derivative self-assembled nanoparticles are obtained. The nanoparticles contain vitamin B12 so that a plurality of drug molecules can pass through an intestinal mucosa by the means of active transportation to enter portal circulation, and it is ensured that the administration dosage achieves treating effects. The formula is shown in the description.

The invention discloses a method for treating spartina alterniflora by using habitat restoration ecological succession measures. The method utilizes the excellent growth characteristics of pioneer mangrove forest species, the growth speed of the pioneer mangrove forest species exceeds that of spartina alterniflora in a short time and the pioneer mangrove forest species is quickly closed, so that the growth of the spartina alterniflora is inhibited, the growth and spreading of the spartina alterniflora are controlled, an arbor, shrub and vine replacement plant multi-layer community is gradually formed, a coastal zone three-dimensional composite ecological system is finally constructed, and therefore the purpose of treating the spartina alterniflora is achieved; and the method overcomes the defects of physical, chemical and biological prevention and control of spartina alterniflora in the prior art, avoids pollution caused by chemical control of foreign species and ecological risks possibly caused by control of natural enemies, saves time and labor, is good in prevention and control effect, achieves large economic and ecological benefits, and is one of the best ways for controlling harm of foreign invasive plants.

The invention relates to an acid heavy metal mine in-situ matrix improved vegetation recovery construction method. The construction method comprises the following steps: performing sampling, testing and analyzing on acid soil, improving the acid soil, improving the mine soil in-situ matrix, and performing sowing of seeds, a microbial agent, a nutritional agent and plant soil, and taking plant growth protection measures, thereby protecting diversified development of vegetation. According to the construction method, through ordered construction steps and processes, the problem of mountain acid production is solved from the source, and the problems of acidity, heavy metal mines, soil pollution ecological restoration and the like can be effectively solved.

The invention relates to a restoration method for ecological modularized alpine meadows. The restoration method comprises the following steps: (1) a thick-stem diameter part of crop straw is smashed into small pieces, and a thin-stem diameter part is cut into small pieces, and mixing is performed to obtain treated crop straw; (2) animal and plant waste harmlessly treated and clay are evenly mixedto obtain a clay fertilizer blend; (3) after the treated crop straw and the clay fertilizer blend are evenly mixed, water is added for stirring to obtain a mixture; (4) the mixture is compacted and naturally air-dried to prepare 5-hole polygonal ecological modules or 3-hole I-shaped ecological modules with connecting parts; (5) grass seeds are planted in the ecological modules, and are cultivatedto a budding stage to obtain cultivated ecological modules; and (6) after the monsoon season ends and before the rainy season comes, the cultivated ecological modules are paved on sandy grassland, andthe modules are connected by the connecting parts to form a restored region. The restoration method has the characteristics that the plant survival rate is high, the restoration efficiency is high and industrialized construction operation is facilitated.

The invention relates to a treatment method of expansive tunnel surrounding rock, in particular to a pressure relief method of the expansive tunnel surrounding rock. The method includes the followingsteps that (1) the disturbance range of the expansive surrounding rock caused by tunnel construction is proved; (2) the porosity n, the expansion rate alpha and the compressive strength sigmaci of anexpansive surrounding rock test block are determined through tests; (3) the pressure-relief replacement position and depth of the expansive surrounding rock are determined preliminarily; (4) the elasticity modulus Em and the compressive strength sigmacm of the expansive surrounding rock are calculated; (5) the elastomer replacement material type is selected; (6) the hole diameter, the hole depth,the hole number and the hole distance of pressure-relief replacement holes are determined through calculation. Compared with the prior art, the method has the beneficial effects that the expansive rock and earth mass is treated with the method for releasing and relieving the expansion stress, the expansion stress can be reduced or eliminated, and the treatment effect on the expansive rock and earth mass can be realized without a lot of manpower and material resources.

The present disclosure belongs to the technical field of sewage treatment, and in particular relates to a composite microbial preparation for sewage treatment and its application. The inventor believes that the method of using foreign bacteria to treat polluted waters in the prior art has certain uncertainties. The present disclosure provides a composite flora with environmental microorganisms, basic microorganisms, and functional microorganisms recombined into a purifying function. . Further, the present disclosure also provides a microbial composition and an aquatic plant endophyte composition, the above-mentioned microbial combination can well achieve the reduction of silt in black and odorous rivers, and the combination of aquatic plant endophytes can effectively to reduce COD and NH in water 3 ‑N, TP, water chromaticity and odor, thereby improving the water quality of black and odorous water. The microorganism combination has a good application prospect in the field of sewage treatment.

The invention discloses a vitamin B12 derivative capable of being self-assembled into nanoparticles, a preparation method and an application. The vitamin B12 derivative capable of being self-assembled into the nanoparticles is shown as formula I. Carboxyl groups of Boc-phenylalanine dipeptide are activated and coupled by a phosphoric acid onium salt coupling agent or a carbodiimide coupling agent, an active intermediate product is formed, then vitamin B12-carbonyl-putrescine is added, and the vitamin B12 derivative capable of being self-assembled into the nanoparticles is obtained. The vitamin B12 derivative can be self-assembled into the nanoparticles with a drug, thereby being capable of carrying multiple drug molecules to penetrate intestinal mucosa in an active transport manner to enter portal circulation and guaranteeing the treatment effect under the administration dosage.

The invention provides a desertification soil treatment method. The desertification soil treatment method comprises the following steps that a vegetation zone formed by alternately laying and planting ecological vegetation carpets and protection forests is laid on desertification soil along the border between the desertification soil and vegetation towards a desert; a wood retaining wall is erected on the vegetation zone; ecological vegetation ditches and a water storage tank are formed, and supporting wood plates covered with ecological vegetation carpets are laid on the ecological vegetation ditches and the water storage tank; a water pipe provided with spray nozzles is laid, the water pipe is connected with a water pump, and a pumping pipe of the water pump extends into the water storage tank; following management and maintenance are conducted on the laid vegetation zone. By the adoption of the desertification soil treatment method, the desertification soil treatment effect can be achieved by executing the desertification soil treatment method once, after grass seeds and protection forest plants grow well, the texture of the desertification soil can be fundamentally changed, treatment is thorough, and devices used during treatment can be detached and recycled. According to the desertification soil treatment method, effectiveness can be achieved quickly, the period is short, operation is easy, the treatment cost is low, the rate of survival of planted vegetation is high, and the planted vegetation is easy to manage and maintain in the later period.

The invention discloses equipment applicable to dynamic dry-method deodorization in a toilet. The equipment comprises a fixed pipeline as well as a current equalizer, a Fe-grade plate filter, an oxidation bed A and an oxidation bed B which are mounted inside the fixed pipeline. According to the equipment, after reactions of the oxidation bed A and the oxidation bed B, except that the flowing velocity of a gas in the fixed pipeline needs to be kept, the treatment process can be completed without any other auxiliary conditions, a treatment effect can be achieved, and the oxidation bed A and theoxidation bed B can be combined, carried and transported conveniently; and when a substrate plate is deactivated, the substrate plate can be prepared from oxidizer A or a compound reactant B again, sothat the substrate plate can be used repeatedly, and the operation cost can be reduced.

The invention relates to a method for artificially assisted cultivation of Mongolian willow in saline-alkali land in Songnen Plain, which belongs to the field of saline-alkali land planting. The present method solves the problem that the existing Mongolian willow seedling propagation adopts the method of field cutting, which requires a lot of investment, high cost, and consumes a lot of manpower and material resources, and it is difficult to germinate when the seeds are mature and naturally fall. Methods: 1. Seed collection; 2. Treatment before sowing; 3. Sowing; 4. Watering; The invention is used for artificial assisted cultivation of Mongolian willow in saline-alkali land of Songnen Plain in rainy season.

The invention discloses spraying dustproof equipment for a dumper. The equipment comprises a side plate, a hinge mechanism and a water pump mechanism, a rectangular cavity is formed in the inner top of the side plate, a transversely-placed supporting plate is arranged in the rectangular cavity, the bottom face of the supporting plate is connected with the rectangular cavity through the hinge mechanism, and a transversely-fixedly-connected spraying transverse pipe is arranged on the top face of the supporting plate. A transversely-fixedly-connected water tank is arranged at the bottom of the front face of the side plate and is communicated with the spraying transverse pipe through a water pump mechanism. The invention further discloses a using method of the spraying dustproof equipment for the dumper. Through cooperative use of all the mechanisms, the problem that spraying dust removal is inconvenient is solved, the overall design is flexible, dust materials are sprayed with water, wetted dust is not prone to floating in the air due to increase of the weight of the dust, dust particles are more prone to adhering together, the dust particles cannot float out of a vehicle in the transportation process, and therefore the treatment effect is achieved.

The invention discloses a harmonic generation and governance simulation device and a control method of the harmonic generation and governance simulation device. The harmonic generation and governance simulation device comprises a host machine, a control screen, a waveform display screen, a synthesis wave display screen and a harmonic knowledge show screen, wherein the control screen is respectively connected with the waveform display screen and the harmonic knowledge show screen through the host machine, the synthesis wave display screen is connected with the waveform display screen through the host machine, the synthesis wave display screen is used for displaying synthesized waveforms of each waveform in the waveform display screen, a harmonic governance press button is arranged on the harmonic knowledge show screen, and the harmonic governance press button is used for triggering a harmonic governance scheme so that governed waveforms can be displayed in the synthesis wave display screen in a simulation way. Through triggering the harmonic governance press button, the harmonic knowledge show screen can give out real-time reverse waveforms in the simulation way, and the reverse waveforms are output into the synthesis wave display screen so that the waveforms become sine waves, so a harmonic governance effect is reached, when the equipment is adopted, a plurality of oscilloscopes and filters which are required to be used in the prior art are replaced, the cost is reduced, the use is convenient, and in addition, the use process is simpler.

The invention discloses an in-situ remediation method and system suitable for a petroleum hydrocarbon contaminated site, and relates to the technical field of petroleum hydrocarbon contaminated site remediation. An in-situ remediation method suitable for a petroleum hydrocarbon polluted site comprises the steps that underground water is extracted, and the water level of the underground water is reduced to be below soil of a pollution source area; heating the soil in the pollution source area to volatilize petroleum hydrocarbon in the soil; discharging petroleum hydrocarbon gas volatilized from the soil in the pollution source area; and injecting a repairing agent into the underground water in the pollution plume area. The in-situ remediation system suitable for the petroleum hydrocarbon contaminated site adopts the in-situ remediation method. The problems that a petroleum hydrocarbon polluted site is difficult to repair, energy consumption is large, and cost is high can be solved.

The invention discloses saline-alkali soil leakage pipe manufacturing equipment which specifically comprises a conveying device, a rotatable first stitch winding device and a traction device, wherein the conveying device comprises a first fiber yarn containing device, a conveyer belt and baffles which are arranged on two sides of the conveyer belt and of which the width is gradually reduced; the rotatable first stitch winding device comprises a first disc and at least two first wire coil brackets arranged on one side of the first disc; the traction device comprises a first rotating shaft and a second rotating shaft; and the fiber yarn conveying device, the first stitch winding device and the traction device are sequentially arranged according to the conveying direction of the conveyor belt. According to the saline-alkali soil leakage pipe manufacturing equipment disclosed by the invention, the leakage pipe which is firmly coated with fiber yarns can be produced, the leakage pipe can be effectively used for solving the problems such as viscous soil structure, low air permeability, slow soil temperature rise, low microbial activity in soil and low permeability coefficient, and the saline-alkali soil can be treated.

The invention relates to an indoor simulation test device for studying impact of piping on a tunnel and grouting control. The indoor simulation test device comprises a model box, a tunnel lining model, a piping simulation device, a grouting simulation device, a plurality of strain gauges, a displacement gauge bracket and a plurality of displacement gauges. The tunnel lining model is of a segmented hollow aluminum tube, the piping simulation device consists of a plastic film filled with sand, and the occurrence of a piping permeation phenomenon is simulated by injecting a certain volume of water solution. The grouting simulation device consists of a grouting pipe and a grouting device which are arranged at the two ends of the piping simulation device, wherein the plurality of strain gauges cling to the outer wall of the tunnel so as to measure the strain of the tunnel; the displacement gauges are fixedly arranged on the displacement gauge bracket so as to measure a soil body at the upper part of a tunnel model and tunnel settlement. The indoor simulation test device provided by the invention aims at studying the impact of a piping phenomenon on the tunnel and grouting control, and is of great reference value for formulating a technical standard of tunnel construction safety crossing and piping phenomenon control.

The invention discloses a gel bead with antibacterial and formaldehyde removal functions and belongs to the field of indoor waste gas treatment. The gel bead comprises a spherical gel bead core, functional hydrogel coating the gel bead core and a crosslinking agent, wherein the functional hydrogel is prepared from components in parts by weight as follows: 10-16 parts of a photocatalyst, 5-10 partsof nano-silver, 20-30 parts of gel, 5-10 parts of natural pigment, 10-15 parts of plant essential oil and 3-5 parts of an emulsifier. The gel bead core is made of at least one of materials includinggraphene, bentonite, volcanic ash and chitosan. The gel bead has the advantages of slow release function, long acting time and good waste gas removal effect.