38results about How to "Improve activity stability" patented technology

The invention provides a preparation method and application of a novel rare earth doped ferronickel-based alkaline electrolytic water anode catalyst, a substrate of the electrolytic water catalyst is foam iron, and the electrolytic water catalyst does not contain noble metal elements. The electrolyzed water catalyst not only avoids the use of noble metal, but also reduces the use of foamed nickel (the market price of nickel is much higher than that of iron), and has a great advantage in cost.

The application provides a high-porosity Raney nickel electrode and a preparation method thereof, and relates to the technical field of Raney nickel electrodes and preparation thereof. The preparation method of the high-porosity Raney nickel electrode effectively controls the dealuminization rate and the pore uniformity through a preparation process of'sintering treatment + special electrochemical dealloying treatment', and stably prepares the high-porosity Raney nickel electrode. A new process for preparing the high-porosity Raney nickel electrode in an environmentally friendly manner is provided, which replaces the traditional corrosion pore-forming process of a strong alkaline chemical solution and reduces pollution. The prepared high-porosity Raney nickel electrode has a high porosity of up to 52%, and the pore structure is stable, so that the catalytic activity and mechanical stability of the electrode are effectively improved.

The invention belongs to the technical field of microorganisms, and particularly discloses a strain of lactobacillus plantarum and application thereof, and the preservation number of the lactobacillus plantarum SN21 is CCTCC (China Center For Type Culture Collection) NO: M20252076. The lactobacillus plantarum SN21 provided by the invention is applied to fermentation of the peanut protein, the antigenicity of the peanut protein can be effectively reduced by optimizing fermentation conditions, and the oxidation resistance of a product is improved; meanwhile, the lactobacillus plantarum SN21 provided by the invention is used for fermenting peanut protein, and the solubility and the emulsifying property of the lactobacillus plantarum SN21 are improved. The strain has a good application prospect in development and utilization of fermented foods, and particularly has a relatively good application value in development of low-sensitivity peanut products and improvement of functional characteristics.

The utility model belongs to joint bearing technical field, specifically speaking is a kind of detachable rod end joint bearing, including fixed subassembly, connecting component and bearing assembly;Fixed subassembly contains the fixed seat of installation slot, three threaded holes and thread groove, bolt is tightened bearing outer ring in threaded hole, and threaded rod is fixedly connected in thread groove;Connecting component contains connecting rod and one end integrally formed double-threaded threaded tube, threaded tube outer thread cooperates with thread groove, inner thread cooperates with threaded rod, and three are coaxial;Bearing assembly contains outer ring, inner ring, ball and retainer, ball is rollingly engaged between two circular arc grooves.The utility model realizes that each component can be detached, and damaged component can be replaced separately, reduces maintenance cost, improves assembly flexibility and transmission efficiency, shortens maintenance downtime, and is suitable for engineering machinery, automation equipment and other transmission scenes.

This invention relates to the field of catalyst preparation, and discloses a methanation catalyst, its preparation method and application, and a methanation method. The methanation catalyst contains a catalyst support and a nickel active component. Based on the total mass of the methanation catalyst, the catalyst support comprises 80-90 wt% by mass, and the nickel active component (calculated as oxide) comprises 10-20 wt% by mass. The average mechanical strength of the catalyst support is 35-80 N / mm. The particle mechanical strength dispersion coefficient of the catalyst support is in the range of 0-0.55. The catalyst support has a large specific surface area and pore volume. Combined with the supported nickel active component, it can improve the catalytic activity and selectivity of the catalyst. Simultaneously, the catalyst has high average mechanical strength, resulting in high CO conversion and methane selectivity in the methanation reaction.

This invention relates to the field of sensing materials technology, specifically disclosing a cellulose-based conductive hydrogel material for ascorbic acid detection, its preparation method, and its applications. This hydrogel uses TEMPO oxidized cellulose nanofibers (TOCNF) as a biocompatible matrix. By introducing Cu-BTC / CNT composite nanoparticles, a three-dimensional conductive network with both high electrochemical activity and structural stability is constructed. While retaining the biocompatibility and flexibility of cellulose, it exhibits particularly high sensitivity and selectivity in detecting small biomolecules such as ascorbic acid, with short response time and good stability. This method achieves synergistic optimization of the composite material's structural uniformity and functionality without relying on complex molding processes. Experimental results show that the conductive hydrogel prepared by this invention possesses good mechanical properties and biocompatibility, exhibiting high sensitivity and stability in biosensing fields such as ascorbic acid detection, providing a novel high-performance material basis for flexible biosensors.

The invention relates to the technical field of monatomic catalysis, and discloses a monatomic catalyst as well as a preparation method and application thereof. The monatomic catalyst comprises a nitrogen-doped porous carbon carrier and transition metal dispersed on the surface of the nitrogen-doped porous carbon carrier in a monatomic form; wherein the loading capacity of the transition metal is 0.2-2% by mass; on the basis of the total amount of the catalyst, the content of nitrogen in the nitrogen-doped porous carbon carrier is 0.5-4% by mass. Transition metal in the monatomic catalyst is uniformly dispersed on the surface of the nitrogen-doped porous carbon carrier in a monatomic form, and the monatomic catalyst has high activity and high stability when being used as a catalyst for an electrocatalytic oxygen reduction reaction, a hydrogen evolution reaction, an oxygen evolution reaction or a fuel cell.

The application discloses a leg movement mechanism of a humanoid robot, which comprises a hip joint structure, a thigh structure, a knee joint structure, a shank structure, an ankle joint structure and a foot sole structure, an ankle joint pitching driving motor and an ankle joint horizontal rolling driving motor are fixedly installed at the thigh structure close to the hip joint structure, the two motors are connected to two power input gears of a differential mechanism through a transmission mechanism, a power output gear of the differential mechanism is connected to a shank connecting rod through a spherical hinge, and the shank connecting rod is connected to the foot sole structure at the end. The ankle joint pitching driving motor and the ankle joint horizontal rolling driving motor are moved upward to the thigh structure close to the hip joint structure, the mass and the rotational inertia of the shank structure are effectively reduced, the energy consumption is reduced, the movement flexibility and the response speed are improved, and the adaptability to different movement modes and terrains is enhanced through coupling and decoupling control.

The invention discloses a preparation method of a monatomic catalytic material and application of the monatomic catalytic material in degradation of bisphenol A. The method comprises the following steps: (1) adding acetic acid and zircon salt into an organic solvent containing terephthalic acid or ortho-substituted terephthalic acid, and reacting in a sealed environment at high temperature to obtain UiO-66-X; wherein the molar ratio of zircon salt to terephthalic acid or ortho-substituted terephthalic acid is less than 1; (2) soaking the UiO-66-X obtained in the step (1) in N, N-dimethylformamide, then soaking the UiO-66-X in acetone, centrifuging, washing, and carrying out vacuum drying overnight to obtain UiO-66-X powder; (3) dispersing the UiO-66-X powder in an organic solvent containing cobalt salt, carrying out ultrasonic dispersion, and reacting in a sealed environment at high temperature to obtain Co / UiO-66-X; and (4) firstly soaking the Co / UiO-66-X obtained in the step (3) in N, N-dimethylformamide, then soaking the Co / UiO-66-X in acetone, centrifuging, washing, and carrying out vacuum drying overnight to obtain Co / UiO-66-X powder.

A method for preparing a hydrodemetallization catalyst, belonging to the field of catalyst preparation technology, includes the following steps: impregnating spherical carbon particles with an iron-containing solution and drying them; mixing the dried carbon particles uniformly with alumina sol and forming droplets; drying and calcining the formed products to obtain an iron-modified alumina support; immersing the iron-modified alumina support in an organic ammonium solution for a first and second hydrothermal treatment; drying and calcining the treated products to obtain a treated alumina support; impregnating the treated alumina support with an active component impregnation solution; drying and calcining the impregnated support to obtain the hydrodemetallization catalyst. The catalyst prepared by this method exhibits high dehydrogenation, Ni removal, and V removal activity, while also possessing high tolerance for metal impurities. This catalyst is particularly suitable for the hydrotreating of heavy oil with high Ni impurity content.

This invention relates to the field of cutting equipment technology and discloses a cutting device for the production and processing of stainless steel round bars. The device includes a base and a shearing machine body fixedly installed at the top center of the base. The shearing machine body includes a support base, a fine-tuning component is disposed between the support base and the base, and a positioning component is disposed on one side of the top of the base. The fine-tuning component is driven by a threaded screw and a screw sleeve, and a gear and nut structure achieves stable locking after adjustment. A scale structure is used to achieve precise adjustment of the cutting position. In the positioning component, the round bar drives a rubber wheel to rotate, which in turn drives a pointer to rotate via a bevel gear, completing length measurement in conjunction with a scale. Through the coordinated functions of the two sets of components, the device achieves round bar circumferential positioning, precise measurement without markings, and rapid fixed-length cutting. Its compact structure is suitable for portable applications, and the purely mechanical transmission provides strong anti-interference capabilities, effectively avoiding round bar skew and measurement failure, significantly improving cutting accuracy and operational efficiency.

This invention belongs to the field of temperature difference control technology for upper and lower bridge arms of a power module, and particularly relates to a method for dynamically balancing the temperature difference between the upper and lower bridge arms. The method includes: S1, acquiring the temperatures of the upper and lower bridge arms; S2, calculating the temperature difference and the rate of change of the temperature difference between the upper and lower bridge arms; wherein, T1 equals the upper bridge arm temperature minus the lower bridge arm temperature; if T1 < T2, entering monitoring mode and recording only data; if T1 ≤ < T2, entering a mild adjustment mode and proceeding to S3; if T1 ≥ T2, entering an aggressive adjustment mode and proceeding to S4; wherein T1 and T2 are preset first and second temperature difference thresholds, respectively; S3, reducing the temperature difference by adjusting the PWM duty cycle and dead time; S4, reducing the temperature difference by switching the operating mode and adjusting the switching frequency. This method can achieve active, rapid, and accurate dynamic balancing of the temperature difference between the upper and lower bridge arms without affecting system performance.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

This invention discloses a non-contact ship bottom cleaning machine based on pulse cavitation technology, comprising a mounting frame with a sealed box, inside which are pulse cavitation generation equipment and control equipment. Two drive wheels are fitted with transmission belts, the outer walls of which are fixed with permanent magnets. A drive mechanism for rotating a drive shaft is installed inside the sealed box. A mounting plate is mounted on the mounting frame, and multiple sets of dirt guiding mechanisms are installed on the mounting plate. This invention effectively solves the core technical bottlenecks of existing pulse cavitation cleaning robots, achieving integrated operation of non-contact, high-efficiency ship bottom cleaning and simultaneous dirt collection. It retains the advantages of pulse cavitation technology—high cleaning efficiency, no secondary damage, and environmental friendliness—while avoiding the impact of dirt diffusion on the moving mechanism, thus improving the machine's mobility and operational stability.

The application belongs to the technical field of hydrogen production, and discloses a preparation method of a nickel-based catalyst based on expanded graphite dispersion and application of the catalyst in hydrogen production by ammonia cracking, which comprises the following steps: (1) uniformly dispersing expanded graphite in deionized water; (2) adding nickel chloride hexahydrate and cerium chloride heptahydrate to uniformly disperse on the surface of the expanded graphite; (3) adding sodium borohydride to the mixture to perform reduction, centrifugation and washing; (4) calcining the obtained solid by centrifugation, and oxidizing and crystallizing Ce(III) into CeO2 under a high-temperature environment; and (5) reducing to obtain a Ni / CeO2-expanded graphite catalyst under pure hydrogen condition. The three-dimensional precursor is formed by the reduction method of nickel chloride, cerium chloride and expanded graphite, Ni and CeO2 are dispersed and fixed on the expanded graphite, and through the confinement effect and electronic transfer synergistic effect of the expanded graphite, the catalyst exhibits excellent catalytic activity in the ammonia decomposition reaction.

The utility model provides a ramp vehicle type identification device which comprises a first fixing assembly, a second fixing assembly and an identification device, one end of the first fixing assembly is fixedly connected with an external basic cross rod in a hoop mode, the other end of the first fixing assembly is detachably connected with the bottom of the identification device, and the identification device is used for identifying and photographing vehicle types in a ramp. The existing split arrangement is replaced by the integrated modular recognition device, so that the mounting convenience is improved; through hoop arrangement of the first fixing assembly and the second fixing assembly and universal joint adjustment, three-dimensional space multi-direction adjustment is achieved, foundation cross rods with different diameters are adapted, and the installation flexibility and the structural stability are further improved; the camera mounting plate adopts a bending reinforcing structure to be matched with a horizontal waist-shaped hole adjusting mechanism, so that the vibration resistance is enhanced, and the camera is accurately positioned; the rain cover is arranged, so that environmental influences such as rainfall and condensation in rainy and snowy weather are effectively resisted.

The invention relates to the field of additives, and discloses a probiotic fermented feed additive for replacing antibiotics to improve the milk yield of dairy cows, and the probiotic fermented feed additive comprises 70-95% of a symbiotic fermentation substrate. 1% to 10% of saccharomyces cerevisiae; 1% to 10% of lactobacillus plantarum; 1% to 5% of bacillus subtilis; 1% to 5% of propionibacterium propionate; the symbiotic fermentation substrate comprises trehalose, glycerol, bacterial exopolysaccharide and organic acid; mycose derived from the symbiotic fermentation substrate is physiologically enriched in cytoplasm of the lactobacillus plantarum, the organic acid in the symbiotic fermentation substrate comprises propionic acid and lactic acid, and the weight ratio of the propionic acid to the lactic acid is between 1.1: 1 and 5: 1. The additive is used for cow breeding instead of antibiotics, the problems of food safety risks and bacterial drug resistance caused by antibiotic residues are radically eradicated, and meanwhile, multiple probiotics such as saccharomyces cerevisiae and lactobacillus plantarum are scientifically proportioned and have a synergistic effect with a symbiotic fermentation substrate.

The invention belongs to the technical field of organ chips and biological manufacturing, and relates to a vascularized multi-tissue interaction organ chip based on a phase change sacrificial structure and a construction method and application thereof. According to the invention, collaborative construction of multiple tissue chambers and a blood vessel-parenchymal tissue biological interface is realized through a continuous phase change process of the sacrificial hydrogel material; according to the organ chip disclosed by the invention, an extra diaphragm or complex processing is not needed, the continuity and the bionic property of a multi-tissue interaction interface are maintained, the simulation of signal exchange and a pathological process among multiple tissues in a body is facilitated, and the organ chip has higher bionic property and applicability in applications such as complex physiological interaction modeling, drug evaluation and disease mechanism research.

The utility model discloses a kind of preparation fermentation devices of medicine-food homologous composition, including tank body and the stirring main shaft being arranged in the tank body, the tank body outer wall is provided with heat exchange system, including upper heat preservation shell and heat exchange pipe.The device also includes demister, and the demister includes shell and defoaming piece.The utility model relates to the technical field of fermentation of composition, strong suction effect is generated when impeller rotates, cooperate into flared mouth at the bottom of pipeline, can suck into shell in tank floating scum, after floating scum is thrown to mesh cover by impeller, by impact, coalescence broken into droplet, backflow to tank by bottom back-liquid, solve the problem that traditional sawtooth type demister is not complete to medicine-food homologous composition floating scum capture.Protracted gas in defoaming process enters heat preservation clamping cavity by first back gas pipe, and the air or oxygen temperature that enters into tank body is close to composition temperature with the air inlet in helical heat exchange pipe, significantly improve the microbial activity stability.

The invention provides a silsesquioxane porous material with a near-infrared light catalytic effect as well as a preparation method and application of the silsesquioxane porous material. The preparation method of the silsesquioxane porous material comprises the following steps: (1) in a solvent A, under the action of piperidine, enabling (3, 5, 5-trimethylcyclohex-2-alkenyl) malononitrile to react with a donor compound to obtain a D-A compound; (2) dissolving octavinyl silsesquioxane and the D-A compound obtained in the step (1) in a solvent B, adding a catalyst, uniformly stirring, and reacting; after the reaction is finished, cooling, filtering and washing to obtain a solid; and carrying out Soxhlet extraction on the obtained solid, and carrying out vacuum drying on the obtained solid to obtain the silsesquioxane porous material with the near-infrared light catalytic effect. The prepared silsesquioxane porous material has the advantages of wide absorption of near-infrared light, high light absorption and conversion efficiency, high catalytic activity, chemical stability and water stability.

This invention discloses a dry gas hydrogenation catalyst and its preparation method. The support component is alumina, and the active components are Group VIB metal sulfides and Group VIII metal sulfides. The average number of lamellar layers of the sulfides is <1.5 layers, and the proportion of single layers is 65%~80%. Based on the weight of the catalyst, Group VIB metal sulfides account for 1wt%~20wt% of the total mass of the catalyst, and Group VIII metal sulfides account for 0.5wt%~10wt% of the total mass of the catalyst. The total acid content of the catalyst is 0.1~0.25 mmol / g, of which the strong acid content at 400-500℃ accounts for 1%~6%, the medium-strength acid content at 250-400℃ accounts for 10%~20%, and the weak acid content at 150-250℃ accounts for 74%~89%. The preparation method is as follows: Boehmite dry adhesive powder is calcined at high temperature in an oxygen-containing atmosphere. The alumina dry adhesive powder is then impregnated with an active component impregnation solution, dried, and calcined at high temperature in an oxygen-containing atmosphere. Finally, it is calcined in a mixed atmosphere of H2S and H2. After molding, drying, and calcination, a dry gas hydrogenation catalyst is obtained. The catalyst of this invention exhibits good hydrogenation performance for organic sulfur and olefins, and also possesses excellent resistance to carbon deposition.

The invention discloses an electricity protection device and method based on direct current discharge of an electric automobile, and belongs to the technical field of new energy automobile charging and discharging. The device comprises a quick plug, a V2G bidirectional power module, a static transfer switch STS, a bypass device and a lightweight energy management system EMS; the quick plug is connected with the V2G bidirectional power module; the V2G bidirectional power module is connected with the AC bus. The first end of the STS is connected with an AC bus, and the second end is connected with a bypass device in parallel and then connected to a load; the bypass device and the STS form dual redundancy protection; the lightweight energy management system EMS is connected with the electric vehicle through a quick plug, collects the battery SOC, the battery temperature and the battery voltage of each path of the electric vehicle, and controls the electric vehicle to participate in power grid interaction through a V2G bidirectional power module; and monitoring the commercial power voltage, and triggering an STS switching instruction according to the commercial power voltage state. Resource reuse is achieved, it is ensured that the key load is not powered off, and the requirements of medium and large power protection scenes are met.

This invention relates to the field of catalyst preparation, and discloses a methane dry reforming catalyst, its preparation method and application, and a method for methane dry reforming. The methane dry reforming catalyst comprises a catalyst support and an active metal; the active metal is selected from at least one of Ni, Ru, Rh, Ir, and Pt; the mass percentage of the catalyst support is 80-99 wt% based on the total mass of the catalyst, and the mass percentage of the active metal (based on oxides) is 1-20 wt%; the average mechanical strength of the catalyst support is 20-60 N / mm; the particle mechanical strength dispersion coefficient of the catalyst support is in the range of 0-0.52. This catalyst, when used in the reaction of methane dry reforming to syngas, exhibits high methane conversion and hydrogen selectivity.

The invention relates to the technical field of stem cell engineering and anti-aging biology, in particular to a histone modification regulation method based on placenta amnion sub-totipotent stem cells and an anti-aging preparation thereof. The regulation and control method comprises the following steps: separating and purifying healthy full-month caesarean section placenta amniotic membrane tissues, carrying out composite enzymolysis and flow cytometry screening to obtain CD105 < + >, CD73 < + > and CD45 <-> stem cells, and primarily culturing the CD105 < + >, CD73 < + > and CD45 <-> stem cells; the method comprises the following steps: determining histone methyltransferase MLL3 and demethylase JMJD3 as target spots through ChIP-seq, and determining H3K4me3 and H3K27me3 as target modification sites; an MLL3 activator CM-272 with the final concentration of 15 [mu] M and a JMJD3 inhibitor GSK-J4 with the final concentration of 10 [mu] M form a composite regulator, and induction culture is performed for 84 h under the conditions of 37 DEG C and 5% CO2; and carrying out Western Blot verification and screening on the stem cells meeting the standard. According to the anti-aging preparation, regulated stem cells are used as active ingredients, a sodium alginate-gelatin (2: 1) composite carrier, 5% mannitol and 1% human serum albumin protective agent are used as auxiliary materials, and the injection with the pH of 7.2-7.4 is prepared. The method is accurate in regulation and control, and the preparation is remarkable in anti-aging effect and low in immunological rejection risk.

The invention relates to the field of oil refining catalysts and discloses a high-stability catalytic cracking catalyst as well as a preparation method and application thereof. The catalytic cracking catalyst is prepared from the following components in percentage by weight on a dry basis: 5 to 40 weight percent of molecular sieve, 5 to 40 weight percent of clay, 5 to 35 weight percent of silicon species in terms of SiO2, 30 to 75 weight percent of aluminum species in terms of Al2O3, 0.5 to 15 weight percent of magnesium in terms of oxide and 0.5 to 10 weight percent of activity regulating element in terms of oxide, the total pore volume of the catalyst is not less than 0.5 mL / g according to a low-temperature nitrogen adsorption method; the alkali center content of the catalyst is determined to be 0.05-0.5 mmol / g by a CO2-TPD method; and the micro-reactivity retention degree before and after 17 hours of treatment in 100% water vapor at 800 DEG C is not lower than 60%. The catalyst enhances the heavy oil conversion capacity and significantly reduces the coke yield.

The invention provides a cobalt indium carbon catalyst suitable for methanol liquid phase reforming hydrogen production and aromatic hydrocarbon hydrogenation, and a preparation method and application thereof, and belongs to the technical field of metal carbide catalyst preparation. The preparation method of the cobalt-indium-carbon catalyst comprises the following steps: adding a cobalt source, an indium source, an amino acid coordination additive and a nitrogen-rich carrier into a solvent containing organic amine, putting the obtained mixed solution into a reaction kettle, and carrying out a hydrothermal reaction at a solvent filling rate of 20-40%; after the reaction is completed, filtering, washing and drying to obtain a nitrogen-anchored metal precursor / carrier intermediate; and carrying out high-temperature carbonization on the obtained nitrogen-anchored metal precursor / carrier intermediate to obtain the nitrogen-anchored metal catalyst. According to the preparation method, an amino acid coordination additive is introduced through a nitrogen anchoring pre-carbonization-synthesis gas controllable carbonization two-step sequential construction method, a coordination complexing-nitrogen anchoring double-anchoring system is constructed, and the prepared cobalt-indium-carbon bimetallic carbide catalyst can be used for hydrogen production through methanol liquid phase reforming and ethylene tar naphthalene hydrogenation reaction at the same time.

This application discloses a temperature coefficient current generation circuit, chip, and electronic device. The circuit includes: a voltage generation module providing first and second reference voltages, the difference between which has a positive temperature coefficient; a clock signal generation module generating at least one set of clock control signals containing non-overlapping relationships; a switched capacitor module responding to the clock signal, coupling the second reference voltage to an internal capacitor for charging in a first operating phase, and coupling the first reference voltage to the internal capacitor and discharging it to output voltage in a second operating phase; an error amplification module generating an error control signal based on the output voltage; and a current output module providing an output current based on the error control signal. This application replaces resistors with a switched capacitor network, making the output current independent of resistance, eliminating the influence of resistor temperature drift, and allowing for flexible adjustment via clock frequency or capacitor value, thus improving current accuracy and design freedom.

The application relates to the technical field of food safety detection, and discloses a sample heating control method and device for detecting sulfur dioxide in food and medicinal materials. The method is based on a heating module and a distillation flask, and a heat-resistant medium is arranged between the heating module and the distillation flask, and the method comprises the following steps: based on a sample detection instruction, the heating power of the heating module is controlled; a part of the distillation flask containing the sample is a first part, and a part of the distillation flask not containing the sample is a second part; the heating module provides first heat energy for the first part, and the first heat energy is used for keeping the temperature of the sample within a preset target temperature range; the heating module provides second heat energy for the second part through the heat-resistant medium, and the second heat energy is used for keeping the temperature of the second part lower than the volatilization temperature value of dilute hydrochloric acid in the sample. Since the volatilization of dilute hydrochloric acid cannot be eliminated by the current technology, the application can eliminate the volatilization of dilute hydrochloric acid, and improve the accuracy of the result of detecting sulfur dioxide in food and medicinal materials.

The invention belongs to the technical field of power supply dispatching, and particularly relates to an intelligent regulation and control method for UPS centralized power supply for an underground alternating current charging pile, which comprises the following steps: acquiring vehicle charge state and travel end point information, and calculating theoretical residual electric quantity; candidate charging parking spaces are screened along the driving path, the UPS releasable power and the load rate are obtained, and environment data, the bus voltage distortion rate and the load level are collected; calculating the charging duration and the charging quantity, screening the charging piles which meet the constraint conditions and are safe in environment, and determining a target charging pile; performing charging power prediction in combination with the input power of a vehicle charger, determining an inversion module scheduling strategy and bus parameters according to the available capacity and redundancy capacity of the UPS, and forming a pre-scheduling scheme; when the vehicle approaches, the inversion module is started, parallel operation synchronization is completed, and a pre-output power supply state is formed; after the vehicle is connected, BMS feedback is obtained and matched with the preset scheme for judgment, charging is executed when conditions are met, otherwise, the charging is executed after adjustment, and therefore the power supply stability and the charging efficiency are improved.