306results about How to "Solve the adsorption problem" patented technology

The invention discloses a full-temperature-range pressure swing adsorption gas separation, refinement and purification method.By means of the difference of the temperatures and pressures of different raw material gases and the difference of the adsorption separation coefficients and physical chemistry properties of all components in the raw material gases in the temperature range of 80-200 DEG C and the pressure range of 0.03-4.0 MPa, the adsorption or desorption regeneration operation of the pressure swing adsorption circulation process is adjusted by coupling all separation methods, the adsorption theory that the pressure or temperature swing adsorption separation process is only limited to the adsorption and desorption regeneration circulation operation through pressure or temperature changes is expanded, and therefore all raw material gases are separated, refined and purified by achieving the energy gradient utilization in the gas separation, refinement and purification process and achieving the circulation operation, where adsorption, desorption and regeneration are easily matched and balanced, in the moderate to low cold and moderate to high temperature pressure swing adsorption separation process, and it is changed that a traditional adsorption method is only limited to the auxiliary effect of refinement and purification, and adsorption becomes the basic separation unit operation just as important as refinement, absorption and extraction separation.

The invention discloses a four-feet electromagnetic adsorption wall climbing robot. The four-feet electromagnetic adsorption wall climbing robot is formed by three parts, i.e. a chassis, walking legs and a foot adsorption apparatus. The walking leg comprises a multi-joint serial-connection mechanism connected onto the chassis and driving mechanisms installed at various joints, and a free end of the multi-joint serial-connection mechanism is connected with the foot adsorption apparatus; the foot adsorption apparatus comprises a plurality of disc mounting plates and electromagnetic suckers which are connected with the multi-joint serial-connection mechanism by virtue of passive ball hinges; and in the wall climbing process of the robot, the rotation action of each joint of the walking leg cooperates with the opening-closing state of an electromagnetic switch, so that the robot flexibly climbs a plane, a cylindrical surface and a spherical surface of any curvature and can flexibly realize the actions such as cornering and transverse movement. By adopting the four-feet electromagnetic adsorption wall climbing robot, the defects in the wall climbing process of a conventional wall climbing robot can be solved, the contradiction between the wall adsorption and the movement operation is well solved, the flexibility and applicability of the wall climbing robot in real engineering application are improved, and the popularization of the robot technology is facilitated.

The invention discloses a nano-compound adsorbent for efficiently removing trace phosphorus, arsenic and antimony from a water body, belonging to the technical field of environment functional materials. The organic framework of the nano-compound adsorbent of the invention is hypercrosslinked styrene-divinylbenzene ion exchange resin, a functional group for surface binding of the organic framework is a quaternary ammonium group or pyridyl, nano-inorganic functional particles are loaded, and the total volume of 1-20nm nano-pores accounts for greater than or equal to 90% of the total volume of all the pores of the organic framework. The nano-inorganic functional particles are nano-hydrated ferric oxide or nano-hydrated manganese oxide. The nano-compound adsorbent of the invention has more obvious nano effect, strong reaction activity, great adsorption capacity and high selectivity, well solves the defects of obvious swelling, weak adsorption reaction activity, small adsorption capacity, lower adsorption selectivity and the like of the existing nano-compound adsorbent, and is more suitable for advanced treatment of micro-pollution of water and waste water.

The invention discloses a heat-conductive silicone grease composition being high in heat conductivity and low in viscosity and freeness degree, and a preparation method of the silicone grease composition. The heat-conductive silicone grease composition includes organo-polysiloxane, heat conductive filler and other additives. By selecting the heat conductive fillers in multiple dimensions (one-dimension, two-dimension and three-dimension) and multiple scales (micron, submicron and nanometer) and in special ranges, synergistic effect among the multi-dimension and multi-scale fillers is achieved,thus achieving compact stack of the fillers in a local network structure. The heat-conductive silicone grease not only is improved in heat-conductivity but also has good flowability, low viscosity and low freeness degree.

The invention provides a grading three-dimensional porous graphene / titanium dioxide photocatalyst and preparation method thereof. The photocatalyst is composed by a three-dimensional grapheme framework and nano titanium dioxide particles; the grahene is provided with a macroporous structure; titanium dioxide is mesoporous titanium dioxide; the macropores and the mesopores are communicated; the nano titanium dioxide particles are scattered on a grapheme nano sheet; the surfaces of nano titanium dioxide microspheres are wrapped with graphene nano sheets; the macropores of the graphene are filled with the nano titanium dioxide microspheres. The photocatalyst with a three-dimensional structure can not only prevent the graphene sheet layers from stacking, but also scatter titanium dioxide particles excellently, and is high in specific surface area; besides, samples can be used for photocatalysis degradation of methylene blue, and the methylene blue can be fully degraded in 25 minutes. The preparation method provides a new thought for preparation of the photocatalyst, and has a potential application value in the fields of energy sources and environment.

The invention relates to a preparation method of a hydrophobic activated carbon modified material. The hydrophobic activated carbon modified material is prepared by taking ethyl orthosilicate as an additive, hexadecyltrimethoxysilane as a modifier, and anhydrous ethanol as a solvent, and carrying out liquid-phase impregnation, suction filtration and drying on activated carbon. The preparation method provided by the invention has the advantages of being simple in process and mild in conditions, and the hydrophobic activated carbon modified material can be prepared under the condition of room temperature; and the modified activated carbon is good in hydrophobic effect, stable in property and good in repeatability, the hydrophobic property can be restored only by simply drying, especially the defects that porous activated carbon produces bacteria and mildews in a humidity environment and has reduced absorption capability for target pollutants due to moisture absorption are overcome, and economic and technical effects are remarkable.

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 gas separation method using sub-pressure swing adsorption, wherein the method comprises pretreatment, negative pressure adsorption concentration, refinement, and recovery removal. According to the present invention, based on pressure swing adsorption, different material components have different adsorption separation coefficients and different physicochemical properties under a negative pressure, adsorption is performed under the negative pressure, evacuation or rinsing desorption is performed, and various separation methods are coupled, such that various mixed gasesare separated and purified through the circulation operation of the pressure swing adsorption process, and particularly the relatively easily adsorbed (and relatively difficultly desorbed) component is separated and purified, wherein the adsorption and the desorption in the circulation are easily matched and balanced; the generated non-adsorbed gas is the intermediate gas, or is the product gas and the qualified discharge gas, or enters the subsequent refining process so as to be refined to obtain the product gas or the qualified discharge gas; and the generated desorbed gas is the condensed gas, and sequentially enters the subsequent recovery removal process so as to further recover or remove the adsorbate component.

The invention discloses a rope coring positioning suspension mechanism with an in-place notifying function. The rope coring positioning suspension mechanism comprises an inner pipe assembly and an outer pipe drilling tool. The inner pipe assembly is arranged in the outer pipe drilling tool and can work when a rope drilling tool is released, an annular washing liquid channel between the inner pipe assembly and the outer pipe drilling tool is cut off after the rope drilling tool is released in place, water hammer pressures can be generated, a movable valve block can be driven to open a washing liquid channel at a valve block plate, and operators can know that the rope drilling tool is released in place by the aid of pressure fluctuation of an earth surface pressure gauge; a locking device is unlocked when the rope drilling tool is about to be fished, a fisher can drive a rope fishing spear to move upwardly, the movable valve block moves to the uppermost end of the rope coring positioning suspension mechanism, the washing liquid channel at the valve block can be opened, the fisher can continue being pulled, and accordingly the rope drilling tool can be completely fished. The rope coring positioning suspension mechanism has the advantages that an in-place notifying device can be automatically reset, accordingly, the rope coring positioning suspension mechanism is low in pressure loss, a locking function can be realized after the rope drilling tool is positioned, the rope drilling tool can be shortened, the rope coring positioning suspension mechanism is favorable for improving the rock core acquisition quality, field application and operation can be facilitated, and problems of suction, absorption and the like when drilling tools are fished can be solved.

The invention discloses a compound biosorbent capable of greatly improving the capability of adsorbing heavy metal by waste biomasses and a preparation method thereof. The biosorbent comprises following components: particles made of crops or wood wastes and nano ferric oxide hydrate which is loaded on the surfaces of the particles and is 10-100mg / g based on iron. The preparation method of the sorbent comprises the following preparation steps: enabling a Fe (III) solution with a certain mass concentration to slowly pass through an adsorption column filled with particle-form agricultural wastes and sufficiently contacting the Fe (III) solution with solid particles; then drying the solid particles at the temperature of 40-60 DEG C for 2 hours; adding the solid particles into a Na-NaCl mixed solution to be vibrated for 12-24 hours; filtering solid substances and repeatedly washing by using 0.001M HCl solution and distilled water until the pH value is 6-8; and finally, drying the treated agricultural waste particles at the temperature of 40-60 DEG C for 12-24 hours to obtain a needed material. According to the compound biosorbent, the adsorption capacity can be increased by 2-6 times, the adsorption speed can be increased by 2-5 times and the distribution coefficient of representation adsorption selectivity is increased by 10-50 times.

The invention discloses a pharmaceutical composition, in particular a pharmaceutical composition prepared by adopting a prescription medicine originated from a traditional Chinese medicine pill and an ultrafine grinding technology, and a preparation method thereof. The preparation method induces an auxiliary material ultrafine grinding technology, thereby enabling mineral medicines to have smaller granularity and greatly increased specific areas, ensuring that medicinal materials from animals and plants have over 90 percent of cell shell-broken rate after being ground in an ultrafine way, active ingredients in the cells can be better exposed to be in a release condition, and the dissolution rate and the bioavailability of the active ingredients are greatly enhanced, maintaining the compound grinding homogenization and fully embodying the traditional Chinese medicine features. The preparation has the advantages that the dissolution rate of the active ingredients is high, the dissolution time is short, the absorption and the utilization are full, the curative effect is good, the production cycle is short, the production cost is low, and the like, thereby having wide market prospect and further satisfying and guaranteeing the requirements of people on medicines.

The invention relates to diatom ooze capable of releasing anions and a preparation method of the diatom ooze. The diatom ooze is prepared from the following raw materials in percentage by weight: 10-50% of kieselguhr, 10-40% of composite tourmaline powder, 0.5-5% of rare earth oxide, 5-30% of titanium dioxide, 5-30% of a cementing material, 1-15% of redispersible powder and 0.1-2% of cellulose, wherein the composite tourmaline powder is mainly prepared from the following raw materials in percentage by weight: 50-80% of tourmaline powder, 10-40% of nanometer titania, 1-10% of sodium silicate and 0.5-1% of a surfactant. The diatom ooze is capable of continuously releasing the anions and a far infrared ray, has good air purification effect and human health effect, is high in purification efficiency and purification persistence and has good adhesive force.

The present invention relates to the tolerance and adsorbability of microbe in biomembrane for treating low concentration lead-containing waste water, and discloses one kind of dominant bacterium, named as klebsiella pneumoniae CGMCC No.2016, shortly as Z-KAE15. Z-KAE15 has unheard-of high lead tolerance, high lead adsorbability and industrial practicability, and Z-KAE15 membrane can reach lead and COD removing rate of 95 % and 90 % separately. Z-KAE15 is obtained through the domestication on biomembrane in natural water, purifying, separating, repeated screening and 16s rDNA sequencing verification. The dominant bacterium Z-KAE15 is applied in environmental bioengineering to expand biomembrane process for continuous treatment of lead-containing sewage.

The invention discloses polyacrylonitrile / polyethyleneimine / graphene oxide nano porous sponge and a preparation method thereof, and belongs to the technical field of adsorption material preparation. Polyacrylonitrile (PAN), polyethyleneimine (PEI)) and graphene oxide as starting materials are subjected to electrostatic spinning and freeze-drying processes to obtain a porous adsorption sponge material with the PAN (polyacrylonitrile) as a skeleton, the PEI as an adsorbent and a cross-linking agent and the graphene oxide as a reinforcing component. Through the electrostatic spinning technology,the surface of the PAN / PEI double-component nanofiber film is smooth, flat, soft and fluffy. The low-density PAN / PEI porous sponge with good rebound resilience is obtained through the freeze-drying technology. The nano-scale ion exchange fiber prepared by the preparation method is formed by stacking polyacrylonitrile nano-fiber with uniform size, and has excellent adsorption performance to metal ions and organic dyes.

The present invention discloses a visible-light-responsive BiVO4 / TiO2 / graphene tri-material composite light catalyst and a preparation method thereof. The preparation method comprises the steps of (1) preparing a suspension system A containing BiVO4 nano particles, and a suspension system B containing a TiO2 sol-gel and graphene oxide; (2) proportionally mixing up the suspension system A and the suspension system B, conducting the heating treatment, separating and drying to obtain a BiVO4 / TiO2 / graphene oxide composite material; (3) suspending the BiVO4 / TiO2 / graphene oxide composite material in short-chain alcohol, adding a reducing agent, conducting the hydrothermal reaction and drying to obtain the visible-light-responsive BiVO4 / TiO2 / graphene tri-material composite light catalyst. The preparation method is simple and easy to operate, and low in cost. Based on the preparation method, the structure and the properties of the composite light catalyst can be regulated and controlled through simply changing the conditions of reactions and heat treatments.

The invention discloses a filter screen cleaning device and an indoor air conditioning unit. The filter screen cleaning device comprises a filter screen, a movable filter screen mechanism and a dust absorption mechanism, wherein the movable filter screen mechanism supports the filter screen and drives the same to move horizontally, and the dust absorption mechanism is fixedly connected with the movable filter screen mechanism and used for cleaning the filter screen. By controlling the movable filter screen mechanism and the dust absorption mechanism to move oppositely, contact absorption plane for the dust absorption is reduced, adsorptive power of a dust absorption chamber is centralized to absorb dust on the surface of the filter screen, and due to a dust absorption groove formed on a dust absorption box holder, the problems that mounting space is limited and dust absorption power is reduced and the like since a conventional dust absorption head is externally connected with a long dust absorption hose and moves back and forth are solved. The filter screen cleaning device is simple in structure, easy to control, low in cost, good in dust absorption reliability, free of influence on appearance of an existing air conditioner, and meanwhile capable of serving as an accessory to be mounted on a conventional air conditioner without a cleaning device, and accordingly more selections can be brought to users.

The invention discloses a preparation method of polylactic acid / polyaniline composite conductive fiber. The preparation method comprises the following steps of: (1) putting polyvinyl alcohol, polyalcohol and a flowing accelerant into a high-speed mixer, mixing under the condition of 50-70 DEG C, and carrying out melt blending at 150-190 DEG C for belting and granulating to obtain plasticized polyvinyl alcohol slices; (2) putting the plasticized polyvinyl alcohol slices and polylactic acid slices into a melt spinning machine to carry out spinning to obtain polyvinyl alcohol / polylactic acid blend fiber; (3) putting the polyvinyl alcohol / polylactic acid blend fiber in water at 40-90 DEG C for 20-60 minutes to obtain the polylactic acid porous fiber; and (4) adding aniline monomers into an acidic water solution, uniformly stirring and then soaking the polylactic acid porous fiber, then adding an acidic water solution dissolved with an oxidant, and reacting for 0.5-3 hours to obtain the polylactic acid / polyaniline composite conductive fiber. According to the preparation method, the technological conditions are easy to implement, the cost is saved and the polylactic acid / polyaniline composite conductive fiber has excellent conductivity.

The invention provides a method for reducing oxygen to kill pests of stored goods. Stored goods curing agent is laid in a sealing curtain for storing the stored goods, and simultaneously pressure swing adsorption nitrogen generating equipment is used for reducing oxygen. The method concretely comprises the following steps: firstly, sealing the stored goods and the stored goods curing agent in the sealing curtain, secondly, reducing the oxygen concentration of oxygen in the air in the sealing curtain to 2 to 8 percent through the pressure swing adsorption nitrogen generating equipment within 8 to 48 hours, and thirdly, further reducing the oxygen concentration of oxygen in the air in the sealing curtain to be lower than 2 percent through the stored goods curing agent within 10 days. The method has an ideal oxygen reducing effect, can reduce the oxygen concentration of oxygen in the air in the sealing curtain to be lower than 2 percent (the concentration for killing stored goods pests) within a short time, and reduce the oxygen concentration to be about 0.5 percent within 10 days, thereby achieving the purposes of rapidly reducing oxygen and killing pets.

The invention discloses a fragrant warming paste containing plant essential oil and a manufacturing method thereof. By changing a raw material layer structure of a common warming paste product, powdered flavor and a heat generating agent are isolated through a micropore air-permeable film, and the single raw material layer is changed into double or three raw material layers. A composite non-woven fabric layer is a non-woven fabric composite high-air-permeability polymer film or a non-woven fabric for avoiding retarded fragrant molecule release and influence on air-permeable performance of the micropore air-permeable film. Plant essential oil is wrapped and cured by cyclodextrin to prepare the powdered flavor, flavor utilization rate is improved, the problems of cutting and slow release of the plant essential oil and other liquid flavors are solved, and the problem that the flavor is directly in contact with the heat generating agent to influence the heating generating stability of the warming paste is solved. The fragrant warming paste containing plant essential oil is advanced in technology, reasonable in scheme design, efficient and capable saving energy, and production technology level of the fragrant warming paste is greatly improved.

The invention belongs to the technical field of composite conductive materials and particularly relates to an ethylene-vinyl acetate copolymer / polyaniline composite conductive material and a preparation method thereof. The preparation method comprises the steps of firstly preparing an ethylene-vinyl acetate copolymer porous membrane, and then carrying out in situ polymerization on the ethylene-vinyl acetate copolymer porous membrane and aniline so as to prepare the ethylene-vinyl acetate copolymer / polyaniline composite conductive material. According to the preparation method, the problem that conductive polyaniline is absorbed by an EVA matrix is thoroughly solved. The preparation method has the advantages that the preparation process condition is easily realized, the cost is saved, and the conductivity of the ethylene-vinyl acetate copolymer / polyaniline composite conductive material is excellent.

The invention discloses a spherical filter material which sequentially comprises a molded master ball layer, one or two or more functional adsorption layers and a porous protective layer from interior to exterior, wherein the material densities of all the layers of the spherical filter material are reduced from interior to exterior. The invention also discloses a method for preparing the spherical filter material. The spherical filter material and the method have the beneficial effects that (1) by integrating multiple odor removal functions together, the problem that a conventional odor filtering screen is single in adsorption performance or the problem of performance caused by the factor that multiple granular filter elements are non-uniformly mixed can be solved; (2) functional compounding is realized through a layer mixing mode, the densities of all the layers are reduced from interior to exterior, stable structure of the spherical filter material can be guaranteed, and different odors are removed in a layering centralized mode, so that the odor is efficiently removed; (3) due to cooperation between a pore-foaming agent and adhesive, the adsorption area and molding strength of the spherical filter material are optimized; and (4) the spherical filter material overcomes the defects that a conventional filter material is non-uniform in filling and continuous production is difficultly realized.

A wall-climbing robot permanent magnetism adsorption force adaptive control device and a method thereof belong to the petrochemical industry non-destructive testing application field. The adaptive control device comprises a wall-climbing robot and an absorption device, and the absorption device is arranged on the side surface of the wall-climbing robot contacted with a magnetic climbing wall surface. The adaptive control device is characterized by also comprising a permanent magnetism driving device, a permanent magnetism adsorption force detection device, a wall-climbing robot pose monitoring device and a permanent magnetism adsorption force control system, wherein the permanent magnetism adsorption force detection device and the permanent magnetism driving device are connected with the absorption device separately, and the wall-climbing robot pose monitoring device is arranged on the side surface of the wall-climbing robot and is controlled by the permanent magnetism adsorption force control system. The wall-climbing robot permanent magnetism adsorption force adaptive control device and the method thereof can achieve the purposes of being higher in magnetic energy utilization rate, and being able to monitor real-timely and control the permanent magnetism adsorption force accurately.

The invention provides an organic waste gas adsorptive recovery system and an adsorption-desorption method thereof specific to the problems of difficulty in filling powdery adsorbents, difficulty in realizing continuous adsorption-desorption operation, low adsorption efficiency, high energy consumption and the like in the conventional organic waste adsorptive recovery system. The recovery system comprises an adsorption tower, desorption equipment, automatic control equipment, condensing recovery equipment, adsorbent conveying equipment and a data treating and gas analyzing workstation. The non-enclosed desorption equipment is designed particularly, so that influent powdery rich adsorbents can be desorbed and regenerated through a 'microwave and vacuum' integration process, and desorbed oil gas is further condensed and recovered. Parameters such as temperatures and concentrations are analyzed online through the automatic control equipment and the data treating and gas analyzing workstation, so that the conveying, desorbing and regenerating operation of the adsorbents can be realized automatically. By adopting the system and the method, continuous adsorption as well as efficient desorption and regeneration of the powdery adsorbents can be realized.

The invention relates to a device for quickly enriching Nx-DAMO bacteria. The device comprises a reactor main body, wherein an outer housing is arranged outside the side wall of the reactor main body; an interlayer cavity is formed between the reactor main body and the outer housing; a water bath inlet and a water bath outlet, which are communicated with the interlayer cavity, are formed in the outer housing; a liquid outlet pipe, a liquid inlet pipe and a reserving pipe are arranged on the reactor main body; a top cover is arranged at the top end of the reactor main body; an electrode port and a gas production pipe are arranged at the upper end of the reactor main body; an exhaust branch pipe is arranged on the gas production pipe; a gas inlet pipe is arranged at the bottom of the reactor main body; an adsorption layer support frame is arranged in a circumferential direction in the middle of the inner side wall of the reactor main body; an adsorption layer is mounted on the adsorption layer support frame; an aeration plate support frame is arranged in the circumferential direction at the lower part of the inner wall of the reactor main body; and an aeration plate is mounted on the aeration plate support frame. The invention further relates to a method for quickly enriching Nx-DAMO bacteria with the device.

The invention discloses a numerical control steel plate longitudinal cutting forming machine. The machine comprises a machine body (1), a main gantry assembly (2), a secondary gantry assembly (3), a conveying assembly (4), a cutting main machine assembly (5) and a numerical control system, relates to the field of steel plate longitudinal cutting equipment, and is special gold cutting equipment for achieving no thermal deformation, no extrusion deformation, no oxidation layer, high linear precision, multiline longitudinal separation and once forming on steel plates by a multipoint cutting mode. The machine longitudinally separates the steel plates with different thicknesses by using the multipoint metal cutting mode, improves the equipped level of basic machining, reduces environmental pollution, reduces comprehensive production cost, improves the machining precision, and lays solid foundation for realizing intelligent and individual demands.

A plasma processing system for processing a substrate which includes a single chamber, substantially azimuthally symmetric plasma processing chamber within which a plasma is both ignited and sustained for the processing. The plasma processing chamber has no separate plasma generation chamber. The plasma processing chamber has an upper end and a lower end. The plasma processing system includes a coupling window disposed at an upper end of the plasma processing chamber and an RF antenna arrangement disposed above a plane defined by the substrate when the substrate is disposed within the plasma processing chamber for the processing. The plasma processing system also includes an electromagnet arrangement disposed above the plane defined by the substrate. The electromagnet arrangement is configured so as to result in a radial variation in the controllable magnetic field within the plasma processing chamber in the region proximate the coupling window and antenna when at least one direct current is supplied to the electromagnet arrangement. The radial variation is effective to affect processing uniformity across the substrate. The plasma processing system additionally includes a dc power supply coupled to the electromagnet arrangement. The dc power supply has a controller to vary a magnitude of at least one direct current, thereby changing the radial variation in the controllable magnetic field within the plasma processing chamber in the region proximate the antenna to improve the processing uniformity across the substrate.

The invention discloses modified nanoscale zero-valent iron and a preparation method and application of the modified nanoscale zero-valent iron. The modified nanoscale zero-valent iron comprises rhamnolipid and nanoscale zero-valent iron. The surface of the nanoscale zero-valent iron is modified through the rhamnolipid, and the mass ratio of the rhamnolipid to the nanoscale zero-valent iron is 0.1-2:1. The preparation method comprises the steps that a rhamnolipid solution and a ferrous sulfate solution are mixed, and a NaHB4 solution is dropwise added for a reaction to obtain the modified nanoscale zero-valent iron. The modified nanoscale zero-valent iron has the advantages of being good in dispersing performance, good in stability, high in reaction activity, high in permeability and the like, has the good stabilization efficiency for metal lead in bottom mud, brings no secondary pollution to environment, has a good application value, and has the wide application prospect in the technical field of bottom mud heavy metal pollution treatment.

The invention discloses a precision seed metering device of seeds with middle and large grain diameters. Seed taking principles of pneumatic seed metering devices and mechanical seed metering devicesare combined, and a seed carrying component and a seed metering component are designed, wherein negative pressure and indent holes are combined to conduct seed taking. The precision seed metering device includes a seed metering device shell, a seed removing device, a seed storage device and a shaft; the seed metering device shell includes an end cover, a cover plate, a belt and an external fixingplate; the shaft is mounted on the external fixing plate; the seed removing device is located at the inner side of the end cover of the seed metering device, and the seed storage device is composed ofa seed metering disc, an indent hole sliding block mechanism and a cam-like mechanism. The precision seed metering device can adapt to the appearance requirements of the seeds; in a seed taking stage, the seeds enter the indent holes through negative pressure and self-gravity, then, superfluous seeds are brushed back to a seed chamber through the seed removing device and enter a seed carrying area, the seeds are still subjected to an adsorption effect, indent hole sliding blocks are closed so that the seeds can be more stable in a seed carrying process, a dual seed protection effect is achieved, and finally, the seeds pass through a secondary seed putting area to be put into seed holes. Overall, by adopting the precision seed metering device, power consumption can be reduced, the seed carrying rate is increased, the seed damage rate is reduced, and the sowing qualification rate of the precision seed metering device is increased.

The invention relates to the field of biotechnology, and in particular to a nanogold probe. The nanogold probe comprises nanogold particles and a double-stranded probe which is connected to the nanogold particles, wherein the double-stranded probe comprises a first chain and a second chain; the first chain comprises a first segment and a second segment which are sequentially distributed from 5' to3'; the first segment and the second chain are complementary; the second segment, which serves as a cohesive end, is used for recognizing a target sequence; and the second chain is modified by a fluorescent gene. The nanogold probe provided by the invention, by adjusting nucleotide number of the second segment, can regulate and control hybridization efficiency of a recognition sequence and the target sequence, so that the recognition capacity of the nanogold probe on the target sequence is regulated and controlled.

The invention discloses a veterinary albendazole ivermectin premixing agent and a preparation method thereof. The veterinary albendazole ivermectin premixing agent disclosed by the invention comprises the following components in percentage by weight: 5.5-6.5 percent of albendazole, 0.22-0.26 percent of ivermectin, 5-15 percent of medicinal carbon, 5-10 percent of dextrose anhydrous, 30-59 percent of maize starch, 10-15 percent of an ivermectin pretreatment agent and the balance of an auxiliary material. The preparation method disclosed by the invention is simple in process, convenient to operate and easy to industrialize, and the product prepared by the preparation method disclosed by the invention is uniform in particle size, low in static electricity and good in uniformity.