618 results about "Magnetic stirrer" patented technology

The invention discloses a solid waste admixture prepared based on microbiological treatment of regenerated micro-powder and a preparation method, and aims to overcome the defect that the dilution effect is remarkable when regenerated micro-powder is directly used as an admixture in the prior art. The method comprises the following steps: treating waste concrete to obtain regenerated micro powder; culturing bacillus pasteurii, and preparing a bacterial solution with a target OD value; mixing the regenerated micro-powder and a bacterial solution according to a certain solid-to-liquid ratio, adding urea and biochar, and reacting in a magnetic stirrer for a set time to obtain modified regenerated micro-powder; and taking out the modified regenerated micro powder, filtering, drying to constant weight, and fully scattering to obtain the solid waste admixture. According to the present invention, the bacteria-containing culture solution is subjected to centrifugal treatment and the low concentration of the bacteria solution is adopted, such that the by-products generated by the metabolism of the bacillus pasteurii are reduced on the premise of ensuring the sufficient decomposition of the urea, and the prepared regenerated micro-powder contains rich ultrafine calcium carbonate on the surface, and can be adopted as the solid waste admixture to significantly enhance the compressive strength of the cement matrix.

The invention provides a preparation method for improving the performance and carbon sequestration rate of a steel slag carbonized product, and the preparation method specifically comprises the following steps: (1) weighing the following raw materials in percentage by mass: 50-100 parts of steel slag powder, 13-17 parts of deionized water and 1 part of alcohol amine; (2) mixing the weighed deionized water with alcohol amine to obtain an alcohol amine solution, stirring the alcohol amine solution in a magnetic stirrer, continuously introducing CO2 gas with the concentration of 99.9% to carbonate the alcohol amine solution, and controlling the gas introduction time to be 2 hours; (3) doping an alkylol amine solution subjected to carbonation treatment into the weighed steel slag powder, and uniformly stirring by using a neat paste stirrer; (4) pressing the steel slag mixture into steel slag product briquettes in a compression molding manner; and (5) putting the briquette into a carbonization kettle, and introducing CO2 gas with the purity of 99.9% to prepare a steel slag carbonized product. The problem that the interior of the steel slag carbonized product cannot be fully carbonated and maintained is solved, so that the comprehensive performance and the carbon sequestration rate of the steel slag carbonized product are remarkably improved.

The invention relates to the technical field of oil and gas field exploitation, and discloses a drag reducer for a multifunctional fracturing fluid and a preparation method thereof.The preparation method of the drag reducer for the multifunctional fracturing fluid comprises the steps that acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and modified itaconic acid are added into deionized water, stirring and mixing are conducted, and the drag reducer for the multifunctional fracturing fluid is obtained. Nitrogen is introduced for 30-40 min to remove oxygen, then azobis (isobutylamidine) hydrochloride is added, the mixture is stirred to react for 48-72 h at the temperature of 45-50 DEG C, and a polymer solution is obtained; and directly and uniformly mixing the polymer solution, the compatilizer and the modified nano silicon dioxide, and reacting in a magnetic stirrer at 60-70 DEG C for 1.5-2 hours to obtain the drag reducer for the multifunctional fracturing fluid. The drag reducer has a good drag reduction effect, and the hydrophobicity, the temperature resistance, the salt resistance and the shear resistance are improved.

The invention relates to the field of equipment verification, in particular to a thermostatic bath and a thermostatic method. The constant temperature bath comprises at least one constant temperature bath unit, the magnetic stirrer is rotationally arranged at the inner bottom of the tank body, the cooling fan is arranged at the outer bottom of the tank body, the magnet is arranged on the cooling fan and rotates along with the cooling fan, the semiconductor chilling plate wraps the periphery of the tank body and the periphery of the cooling fan, and the cooling fin is attached to the semiconductor chilling plate. The size of the calorimeter temperature sensor calibrating device is reduced, the operation efficiency and the automation degree are improved, and the temperature can be uniformly controlled.

The invention discloses a charge-discharge energy-saving electro-catalysis sewage treatment method which comprises the following steps: step 1, cleaning a carbon electrode, inserting the carbon electrode into sewage as a cathode and an anode at the same time, and arranging a magnetic stirrer at the bottom of an electrochemical reaction tank; step 2, applying constant voltage or constant current to the working electrode to ensure that the voltage can degrade pollutants, the anode does not generate oxygen evolution reaction, and the cathode does not generate hydrogen evolution reaction; step 3, stopping applying voltage or current to the working electrode, monitoring open-circuit voltage, gradually reducing the open-circuit voltage, and continuously degrading pollutants by utilizing the electric energy stored by the electrode; and step 4, repeating the step 2 and the step 3 until the electrocatalytic degradation is completed. Under the condition that the removal effect is guaranteed, electric energy is saved, and about 30-90% of energy consumption is reduced; the constant-current charging catalysis step ensures that the current density is controllable, and safe production is ensured; the process is simple, does not need special equipment and materials, and is suitable for upgrading and reconstruction of existing sewage treatment systems.

The invention discloses a high-performance malachite green adsorbent as well as a preparation method and application thereof, and belongs to the technical field of preparation of malachite green adsorbents. The method comprises the following steps: with a carbon-based adsorbent as a raw material and an ethanol aqueous solution and a sodium hydroxide solution as modifiers, heating and stirring on a magnetic stirrer to form a turbid liquid; and further carrying out solid-liquid separation on the turbid liquid, washing a solid product with deionized water until the solid product is neutral, and drying. The prepared high-performance malachite green adsorbent is used for treating malachite green printing and dyeing wastewater, and compared with a carbon-based adsorbent raw material, the adsorption performance is effectively improved. The preparation method of the high-performance malachite green adsorbent is simple, rapid, low in energy consumption and good in environmental protection property.

The invention discloses a glass etching device for laser induction and a fluoride-free etching method, and belongs to the technical field of glass etching.The etching device comprises an etching tank and an oil bath heating device, the etching speed can be increased by heating alkaline fluoride-free etching liquid, and the etching efficiency is improved. A composite stirring system of a magnetic stirrer and a stirring paddle can enable the fluoride-free etching liquid to circularly flow, so that the etching uniformity is improved, and the etching reaction is more favorably and stably carried out; the fluoride-free etching method adopts fluoride-free etching liquid, does not contain hydrofluoric acid, is safe and environment-friendly, and can avoid deterioration of through hole characteristics. Under the action of the fluorocarbon surfactant, the etching liquid has excellent wettability, and sodium hydroxide and potassium hydroxide in the etching liquid can perform high-selectivity etching on the glass after laser induction; the glass subjected to fluoride-free etching is high in surface smoothness and higher in through hole roundness, the surface and the inner wall of the through hole are smooth, the roughness of the inner wall of the through hole is smaller than 1 micron, the taper of the through hole is smaller, and a good etching effect is achieved.

The invention discloses a preparation method and application of a methane dry reforming catalyst prepared through ethanol plasma modification, particularly relates to a catalyst for converting two main greenhouse gases of CO2 and CH4 into synthesis gas with the ratio of CO to H2 being 1, and belongs to the field of waste gas treatment technologies and environment-friendly catalytic environments. The preparation method comprises the following steps: firstly, adding a proper amount of H2O into metered Ni (NO3) 2.6 H2O (the mass percent of an active component Ni in the catalyst is 10%) to dissolve the Ni (NO3) 2.6 H2O to obtain a transparent solution; adding the weighed and metered MCM-41 molecular sieve carrier into the obtained transparent solution, uniformly stirring to obtain mixed slurry, and dipping for 45 minutes; drying in a water bath in a constant-temperature heating magnetic stirrer at 80 DEG C, taking out, and drying in a drying oven at 110 DEG C for 12 hours; and putting the obtained product into a radio frequency plasma processing area for activation, the discharge power of the plasma is 200W, the processing atmosphere is EA, and the Ni / M-P (EA) catalyst is obtained. The Ni / M-P (EA) catalyst prepared by the invention has excellent catalytic activity, stability and carbon deposition resistance, and the preparation method is simple in process, easy to operate, short in time consumption and low in cost.

The application discloses a heating magnetic stirrer, a stirring driving device, a temperature measuring device and a temperature control device, wherein the stirring driving device is used for mixing the solution in a beaker and making the temperature distribution of the solution in the beaker more uniform; the temperature measuring device comprises a solution temperature measuring device and a heating table temperature measuring device; the solution temperature measuring device is used for measuring the solution temperature in the beaker and taking the solution temperature as a feedback amount of a main ring; the heating table temperature measuring device is used for measuring the temperature of the heating table and taking the temperature as a feedback amount of a secondary ring; and the temperature control device adopts a fuzzy-serial PID control mode and is used for precisely controlling the solution temperature in the beaker. The heating magnetic stirrer can realize high-precision control of the medium solution temperature, has a small overshoot amount and good stability, and is suitable for different medium solutions.

The utility model relates to the technical field of stirrers, in particular to a magnetic stirrer. According to the technical scheme, the magnetic stirrer comprises a magnet assembly and a heating assembly, and a heat insulation assembly is arranged between the magnet assembly and the heating assembly. The magnetic stirrer has the advantages that the heat insulation assembly can reduce the probability that the heating function affects work of the magnet, and the working efficiency of the magnetic stirrer is improved.

The invention aims to disclose a preparation method of a high-nickel ternary positive electrode material coated with a high-molecular polymer. The preparation method comprises the following steps: (1) mixing and stirring the high-molecular polymer and an organic solvent; (2) slowly adding high-nickel ternary positive electrode material powder in ultrasonic treatment, and continuously performing ultrasonic treatment, so that the ternary positive electrode powder is in full contact with the conductive polymer; (3) heating and stirring by using a magnetic stirrer, and polymerizing; and after the polymerization is completed, washing and filtering, and then carrying out vacuum drying to obtain the high-nickel ternary positive electrode material coated with the high-molecular polymer. The high-stability lithium battery ternary positive electrode material coating is synthesized through the method, the method is simple and effective, a coating layer with the uniform surface is formed, interface ion transmission is improved, the problem that lithium ions are diffused slowly due to the fact that CEI is too thick at the extremely cold temperature is solved, and the electrochemical performance of a battery at the extremely cold temperature is effectively improved.

The invention discloses a preparation method of a halloysite nanotube adsorption material with sulfonic groups polymerized on the surface, and belongs to the technical field of wastewater treatment materials, the preparation method comprises the following steps: S1, adding 5.0 g of halloysite nanotubes and 5 mL of gamma-methacryloxypropyltrimethoxysilane into 100 mL of toluene; s2, in a magnetic stirrer, condensing and refluxing at 120 DEG C for 10 hours, cooling, filtering, washing with toluene and ethanol for multiple times to remove unreacted KF570, and drying a product in a vacuum drying oven at 60 DEG C for 8 hours to obtain a KH570 modified halloysite nanotube; s3, weighing 1.0 g of HNTs-KH570 as a raw material, dispersing the HNTs-KH570 in 80 mL of distilled water, adding 5.0 g of 2-acrylamide-2-methylpropanesulfonic acid, performing uniform ultrasonic dispersion, and continuously stirring at the temperature of 70 DEG C; and S4, adding 0.15 g of ammonium persulfate into 20 mL of distilled water, and fully stirring to completely dissolve the ammonium persulfate. The adsorption performance of the halloysite nanotube to methylene blue is remarkably improved through sulfonic acid group modification, and the adsorption capacity is improved by 270%.

The invention discloses a method for detecting moisture of filler-containing epoxy resin. The method comprises the following steps: step 1, weighing a sample: weighing 4-8g of filler-type epoxy resin to be detected; 2, dissolving a sample: adding 10-20g of an organic solvent, and dissolving and mixing the filler type epoxy resin to be detected; 3, sample dispersion: stirring the mixed solution in the step 2 for 10-30 minutes for uniform dispersion; step 4, extracting clear liquid: putting the solution which is uniformly dispersed in the step 3 into a high-speed centrifugal machine to be centrifugally dispersed for 30 to 60 minutes, and extracting supernate; 5, moisture detection, wherein the content of trace moisture in the supernate is detected. In the detection process, components influencing moisture detection result errors in the filler type epoxy resin are effectively removed only by using a balance, a magnetic stirrer, a centrifugal machine and other instruments commonly used in a laboratory, and then the moisture content in supernate is detected through a high-precision analysis instrument, so that the purpose of detecting the trace moisture content in the filler type epoxy resin is achieved. The detection process is easy to operate and the detection result is accurate.

The invention discloses a solid electrolyte using an electrostatic spinning fiber membrane as a matrix and a preparation method and application thereof, and the preparation method of the solid electrolyte specifically comprises the following steps: (1) sequentially dissolving PVDF powder and commercial tetragonal phase BaTiO3 (BTO) powder in a mixed solvent of DMF and THF, and uniformly stirring with a magnetic stirrer to obtain a PVDF / BTO solution; and (2) carrying out electrostatic spinning on the PVDF / BTO solution to prepare a fiber membrane, drying, and carrying out a solution pouring method to prepare the composite solid electrolyte film. Compared with the prior art, the prepared solid electrolyte has excellent cycle performance, the ion transference number of the solid electrolyte is greatly increased, and the solid electrolyte has good lithium metal negative electrode compatibility.

The invention relates to the technical field of electrolyte, in particular to a thioether cross-linked solid polymer electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: taking N, N-dimethylformamide, respectively adding 3, 6-dioxa-1, 8-octane dithiol and triglycidyl isocyanurate, and uniformly stirring to obtain a mixed solution; adding bis (trifluoromethylsulfonyl) imide lithium into the mixed solution, putting magnetons on a magnetic stirrer, and completely dissolving the magnetons to obtain a precursor solution; and pouring a proper amount of the precursor solution into a polytetrafluoroethylene mold, spreading, and carrying out cross-linking polymerization in a blast oven to form the film. The three-dimensional thioether cross-linked network structure has a large number of weakly coordinated thioether groups, dissociation of lithium salt can be promoted, a large number of free Li < + > is generated, the number of Li < + > is increased, meanwhile, the crystallinity of a polymer is remarkably reduced, the ionic conductivity is improved, the mechanical stability of a film can be improved, and the service life of a battery is effectively prolonged.

The invention discloses a preparation method and application of a high-stability catalyst for preparing synthesis gas through methane dry reforming, and belongs to the field of waste gas treatment technologies and environment-friendly catalytic environments. The preparation method comprises the following steps: firstly, taking metered nickel nitrate hexahydrate (Ni (NO3) 2.6 H2O) and ethyl silicate (C8H20O4Si) as an auxiliary agent Si source and aluminum isopropoxide (C9H21AlO3) (the mass percent of an active component Ni in the catalyst is 10% and the mass percent of the auxiliary agent Si is 5%), adding the Ni (NO3) 2.6 H2O into deionized water, and stirring until the Ni (NO3) 2.6 H2O is completely dissolved to obtain a transparent solution; adding metered C9H21AlO3 into absolute ethyl alcohol, and sealing the constant-temperature magnetic stirrer for 20 minutes to obtain a white solution; the weighed C8H20O4Si is added into the white slurry; closing the constant-temperature magnetic stirrer for 20 minutes to obtain a mixed solution; adding a Ni (NO3) 2.6 H2O transparent liquid into the mixed solution, and placing in a closed constant-temperature magnetic stirrer for 20 minutes to obtain a final solution; uncovering the sealing film of the obtained final solution, and rotating and stirring in a constant-temperature heating magnetic stirrer until the solution is dried by distillation to form powder; putting the obtained powder into a drying oven, and drying overnight to obtain green powder; and putting the obtained powder into a muffle furnace, roasting at 700 DEG C for 5 hours, tabletting the roasted powder by using a tabletting machine under the pressure of 8Mp, and crushing to 20-40 meshes after tabletting, thereby obtaining the Ni-5% Si-Al-O catalyst. The catalytic activity, the stability and the carbon deposition resistance of the catalyst prepared by the method are obviously improved, the process is simple, the operation is easy, the preparation time is short, and the cost is low.

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for catalytic degradation of organic pollutants in sewage through friction and application of the method. A double-friction-interface system is constructed by arranging a metal friction interface at the bottom in a sewage treatment reaction container and arranging a magnetic turntable at the lower end of a magnetic stirrer; an improved sewage treatment reaction container is obtained, a nanopowder catalyst with a layered structure is selected, in the process of friction catalytic degradation of organic pollutants in sewage, friction mechanical energy is continuously converted into friction potential, valence band electrons on the surface of the catalyst can continuously obtain enough energy to be transited to a conduction band, the generation rate of free electrons and holes is increased, and the conversion rate of the organic pollutants in the sewage is increased. Therefore, the reaction rate of free electrons, holes, water and oxygen is accelerated, a large number of strong oxidizing free radicals such as OH and O2-are generated in a short time, and degradation of organic pollutants is accelerated.

The utility model discloses a magnetic stirrer with an efficient stirring function, which comprises a stirring barrel, a liquid inlet valve fixedly connected to one end of the upper part of the stirring barrel, a liquid discharge valve fixedly connected to one end of the lower part of the stirring barrel, a supporting column fixedly connected to the other end of the lower part of the stirring barrel, and a bottom plate fixedly connected to the lower part of the supporting column, a magnetic transmission mechanism is fixedly connected to the middle position above the stirring barrel, a rotating rod is movably inserted into the inner side of the stirring barrel, a stirring mechanism is fixedly clamped to the surface of the rotating rod, and a fixing mechanism is fixedly arranged at the other end above the bottom plate; the radial extension range of the stirring blades can be dynamically adjusted through linkage extension of the hydraulic telescopic rod and the folding rod in the stirring mechanism, and the attack angle and the coverage area of the stirring blades in fluids with different viscosities can be automatically adjusted in combination with real-time feedback control of the adjusting sensor on the pitch angle of the stirring blades, so that the mixing efficiency is remarkably improved.

The invention provides an optical instrument self-cleaning micro flow cell, and relates to the technical field of optical detection equipment, and the optical instrument self-cleaning micro flow cell comprises a self-cleaning analysis module which is used for analyzing a pollution degree index in a measurement cell, and determining whether to generate a self-cleaning signaling according to the pollution degree index; when it is determined that the self-cleaning signaling is generated, calculating a power adjustment value of the ultrasonic vibrator and a rotating speed adjustment value of the magnetic stirrer; and the control module is used for adjusting the power of the ultrasonic vibrator and the rotating speed of the magnetic stirrer according to the power adjustment value and the rotating speed adjustment value after receiving the self-cleaning signaling. An ultrasonic wave and magnetic force synergistic self-cleaning mode is adopted, a mechanical cleaning device is not needed, damage of mechanical cleaning to the structure and the sealing performance of the flow cell is avoided, the reliability of equipment is improved, the service life of the equipment is prolonged, targeted efficient cleaning is achieved through accurate pollution degree index calculation and self-cleaning parameter adjustment, and the service life of the equipment is prolonged. The cleaning effect can be guaranteed, and energy consumption can be reduced.

The invention relates to the technical field of motor control, and discloses a torque adjustment control method of a magnetic stirrer based on sample characteristics, which comprises the following steps: acquiring an armature three-phase current and a rotor position signal, and converting the armature three-phase current and the rotor position signal into a quadrature-axis actually measured current and a direct-axis actually measured current by utilizing coordinate transformation logic; extracting a magnetic declination estimated value reflecting the phase lag degree of the stirrer based on an electromagnetic coupling model; calculating a magnetic declination change rate according to the magnetic declination estimated value of the continuous sampling period; a transient compensation current is generated by adopting a nonlinear compensation operator and combining a real-time synchronous torque coefficient; according to the invention, the transient characteristics of the magnetic declination are utilized to realize the real-time sensing of the load disturbance, the magnetic coupling slippage caused by the sudden change of the characteristics of the sample is effectively inhibited, and the stability of the magnetic declination is improved. And the ineffective temperature rise of the motor is reduced while the system stability is guaranteed.

The utility model provides a magnetism gathering roller type magnetic stirrer for a slab continuous casting machine, which relates to the technical field of electromagnetic metallurgy process in steel industry, and comprises a stirrer body, the stirrer body consists of a roller sleeve, an inductor, an outer shielding ring group and a bearing seat, the inductor is inserted in the roller sleeve, the outer shielding ring group is arranged below the roller sleeve, and the bearing seat is arranged below the roller sleeve. According to the magnetism gathering type stirrer, the overall design is novel, the structure is simple, the angle A of the appearance shielding ring is adjusted through the kidney-shaped hole, and when a pair of magnetism gathering roller type magnetic stirrers is installed in a mirror image mode, the outer shielding ring is aligned. The roller type electromagnetic stirrer has multiple magnetism gathering effects of the inner shielding ring, the magnetic poles and the outer shielding ring, and is high in intermediate magnetic induction intensity and thrust and good in metallurgical effect.

The utility model discloses a small-scale test device for research on anaerobic fermentation of granular sludge. The small-scale test device comprises a fermentation bottle, a granular sludge feeding component, a granular sludge sampling component, an exhaust component and a stirring and mixing device, the granular sludge feeding and sampling component comprises a sample feeding pipe and a sampling pipe which penetrate through the sealing rubber plug of the fermentation bottle, the sample feeding pipe and the sampling pipe enter the fermentation liquid in the fermentation bottle, the feeding pipe is provided with a manual ball valve, and the sampling pipe is provided with a manual ball valve and a check valve. The exhaust component comprises an exhaust pipe, a manual ball valve and an air collecting bag, the exhaust port is connected with the air collecting bag, and a closed environment is kept. The stirring device comprises a stirring rotor and a magnetic stirrer which are arranged in the fermentation bottle, and fermentation liquor is kept uniform in the sampling process. According to the small-scale test device for the granular sludge anaerobic fermentation research, the difficulty in a granular sludge fermentation test can be solved, the device is simple to assemble, the sampling is uniform and sufficient, and the anaerobic environment is stable.

The utility model discloses a magnetic stirrer capable of more controlling temperature and resisting corrosion, which comprises a motor, a stirring rod, a stirring shaft, a stirring shaft, a stirring shaft, a stirring shaft, a stirring shaft and a stirring shaft, wherein the output end of the motor is fixedly connected with the stirring rod through a driving shaft; the stirrer is fixedly connected with the side end of the stirring rod, the stirrer is uniformly distributed around the stirring rod in a surrounding manner, the stirrer is sequentially provided with a magnetic core, a magnetic core shell and a heat dissipation coating from inside to outside, the magnetic core is connected with the magnetic core shell in a sleeving manner, and the magnetic core shell is connected with the heat dissipation coating in a sleeving manner. Through the stirrer hierarchical structure composed of the magnetic core, the magnetic core shell and the heat dissipation coating from inside to outside, the heat conduction capacity of the stirrer can be enhanced so as to avoid magnetic force weakening and excitation loss of the magnetic stirrer, and stable use of the magnetic stirrer is facilitated; the magnetic core is made of a rubidium-iron-boron magnet, the magnetic core shell is made of polytetrafluoroethylene, and the heat dissipation coating is made of high-temperature-resistant graphene, so that the magnetic stirrer has better corrosion resistance and high-temperature resistance.

The invention discloses a preparation method for improving the deacetylation degree of chitosan, which comprises the following steps: step S1, crushing crab shells, cleaning the processed eriocheir sinensis shells, drying at 65 DEG C, grinding the dried crab shells, and sieving with a 100-mesh sieve to prepare crab shell powder; s2, plasma pretreatment: mixing the crab shell powder with distilled water according to the ratio of 1: 20 (w / v), performing pretreatment by adopting atmospheric pressure plasma jet, putting a beaker loaded with a crab shell powder solution into a 180 rpm magnetic stirrer, treating for 60 minutes under the conditions that the power is 750 W and the gas flow is 1.2 L / min, washing to be neutral, and drying at 65 DEG C to obtain the plasma pretreated crab shell powder, the deacetylation degree of chitosan is increased by 4-7% through plasma pretreatment, the product purity is equivalent to that of commercial chitosan, and the production cost is saved; the performance of the chitosan extracted by the method is superior to that of chitosan extracted by a traditional chemical extraction method.

The utility model relates to the technical field of laboratory instruments, in particular to a magnetic stirrer for a laboratory, which is characterized in that a clamping structure for fixing a container is arranged on a magnetic stirrer body; the clamping structure comprises a supporting ring arranged above the placement surface of the magnetic stirrer body and clamping plates arranged in the circumferential direction of the supporting ring, and each clamping plate is provided with a clamping surface and is used for fixing a container through the clamping surfaces of at least three clamping plates; the clamping structure further comprises a first elastic element used for driving the clamping faces of the clamping plates to be close to the axis of the supporting ring. By means of the innovative clamping structure design, the technical problem of fixing of an existing magnetic stirrer container is effectively solved, the magnetic stirrer container fixing device has the advantages of being reasonable in structure, convenient and fast to operate, high in applicability and the like, and experiment safety and reliability are remarkably improved.

1. The name of the product under this design: Magnetic Stirrer (Multi-heating MSM‑H). 2. Purpose of this product design: This product design is an experimental instrument with multiple magnetic stirring stations that can simultaneously stir and mix multiple groups of samples at the same speed. It is used in the petroleum, chemical, biological and pharmaceutical industries. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The application discloses a preparation method of a low-TCR low-cost ceramic heating tube, and comprises the following steps: (1) preparing an organic carrier: 60 parts by weight of terpineol, 20 parts by weight of ethyl cellulose, 10 parts by weight of a binder and 10 parts by weight of diethylene glycol acetate are placed into a magnetic stirrer and uniformly dissolved and mixed; (2) weighing metal powder: Mo: 50-70 parts by weight; Re: 20-30 parts by weight; Mn: 0-5 parts by weight; Cr: 10-15 parts by weight; by adopting Mo, Re, Mn and Cr in a specific ratio as the metal powder, the traditional mode of adopting metal ruthenium powder or a mixture of metal ruthenium powder and other common metal powder is replaced, the prices of Mo, Re, Mn and Cr are low, so that the preparation cost of the ceramic heating tube is effectively reduced, the purpose of low TCR is achieved, and the scale production is facilitated; meanwhile, the ceramic heating tube prepared by adopting the application has higher overall bending strength, and can better meet the use requirement.

The invention relates to a method for controlling biological pollution of a reverse osmosis membrane through photoelectrochemical filtration pretreatment. According to the method, a photoelectrochemical reactor is mainly established to inhibit the bacterial biofilm forming ability under ultraviolet illumination and voltage conditions. The photoelectric chemical reactor is composed of a peristaltic pump, a magnetic stirrer, a reactor, an electrochemical filtering assembly, a direct-current power source and an ultraviolet light source and inhibits bacteria added into the reactor from forming a biological membrane. Under the action of voltage, the electrochemical filter assembly inhibits the biofilm forming ability and viability of bacteria by degrading protein and quorum sensing signal molecules in water, and more thoroughly inhibits the biofilm formation through the irradiation of ultraviolet light. Therefore, according to the method disclosed by the invention, the ultraviolet light can be combined with the electrochemical filter assembly to realize effective inhibition of a biological membrane formed by bacteria, the reduction of membrane flux is reduced, and the method has important significance in controlling biological pollution of the reverse osmosis membrane.

A system for plant-mediated synthesis and characterization of vanadium pentoxide (V2O5) nanoparticles, comprising a structurally integrated device configured to perform extraction, reaction, calcination and performance evaluation within a closed automated control loop, wherein the system includes: a basic chassis made of heat-insulated stainless steel, which houses a microcontroller-based central control unit; a bioextract preparation unit fluidically connected to a reactive mixing chamber, the bioextract preparation unit comprising a Soxhlet extractor with a borosilicate condenser, a thermostatically controlled heating jacket and a digital thermocouple to maintain extraction temperatures between 60°C and 70°C; a precursor feed vessel containing an ammonium metavanadate solution with a molarity between 0.1 M and 0.3 M, wherein this vessel is connected to the reaction mixing chamber via an electromagnetically actuated inlet valve and a precision peristaltic pump; a reaction mixing chamber with an inductive heating coil, a magnetic stirrer plate and a temperature and pH monitoring device configured to maintain a uniform reaction temperature of 70±2°C during the precursor-extract interaction; a calcination module consisting of a muffle furnace lined with refractory ceramic material and containing embedded nichrome heating elements controlled by a PID-controlled temperature controller to achieve a heating rate between 5 °C and 10 °C per minute up to a setpoint of 445±5 °C for combustion synthesis; an optical characterization module with integrated UV-VIS spectrometer, Fourier transform infrared analyzer and photoluminescence detector, each optically isolated and electronically connected to the control unit; and a photocatalytic and antibacterial test chamber fluidically connected to the output of the calcination module, the chamber comprising a UV irradiation array, an optical absorption sensor and a temperature-controlled bacterial incubation plate, the central control unit includes a programmable logic controller (PLC) configured to synchronize the operation of all submodules via feedback control loops, which receive data from temperature, pH and optical sensors, thereby automating the synthesis, analysis and testing of V2O5 nanoparticles.