334results about "Chemical variable control" patented technology

The invention is suitable for the technical field of quartz sand purification, and particularly relates to a quartz sand purification acid liquor concentration automatic compensation control method which comprises the following steps: acquiring an acid liquor concentration parameter sequence; wherein the acid liquor concentration parameter sequence is used for indicating the change of the acid liquor concentration from the beginning of purification to the preset purification time, and the acid liquor concentration reflected by the acid liquor concentration parameter sequence is located in an effective concentration interval; performing segmentation processing based on the acid liquor concentration parameter sequence to obtain sub-parameter segments; determining a compensation opportunity based on the sub-parameter segments; wherein the compensation opportunity is used for indicating the opportunity of adding the acid liquor next time; extracting consumption characteristics of each sub-parameter section; obtaining an initial compensation amount based on the plurality of consumption features; an actual compensation amount is determined based on the initial compensation amount and the compensation opportunity. According to the method, the compensation opportunity and the compensation amount can be sectionally determined based on the acid liquor concentration change rule, so that the purification effect of the quartz sand is improved.

The invention discloses a micro-nano air flotation coupling critical micro-flocculation phosphorus removal control method, which relates to the technical field of water treatment, and comprises the following steps: when the total phosphorus concentration is lower than a preset concentration threshold value, determining the proportion of non-target particles based on the water turbidity and particle spectrum distribution; adding a flocculating agent according to a preset critical dosage to generate target phosphorus floc, and synchronously forming a primary flocculation phase which can be distinguished from non-target particles; applying an interfacial activity regulation factor to the micro-nano bubbles based on the primary flocculation phase, and performing selective regulation; forming a bubble-phosphorus floc complex based on a selective regulation effect; the bubble-phosphorus floc complex is separated and removed in an air flotation mode, the competition intensity history of non-target particles is recorded, and a competition memory curve is formed. According to the method, interfacial activity regulation factors are applied to the surfaces of the micro-nano bubbles, so that the micro-nano bubbles can preferentially and selectively adsorb target phosphorus floc, and efficient removal of low-concentration total phosphorus is realized.

The invention provides a ventilation system optimization method and system based on the air quality of an industrial aquaculture workshop, and relates to the technical field of environment regulation and ventilation system.The method includes the steps that aquaculture workshop gas is analyzed through an infrared spectrometer, the spectral intensity of the characteristic absorption wavelength of a target pollutant is obtained, and then the accurate concentration of the pollutant is analyzed according to the spectral intensity; and calculating a ventilation parameter reference value and controlling a fan to adjust the air supply amount. An air treatment device in the ventilation system can determine the optimal working time according to the air supply amount so as to decompose pollutants and continuously monitor the concentration of the pollutants at the inlet and the outlet of the device. Subsequently, the air quality deterioration index is predicted by analyzing the concentration change trend, and the current overall purification efficiency is calculated. When the purification efficiency deviates from the range or the deterioration index exceeds the threshold value, the running state of the device is dynamically adjusted and fed back to the system, self-adaptive optimization of the ventilation system of the industrial aquaculture workshop can be achieved, and it is guaranteed that the workshop air quality is stable and the purification efficiency reaches the standard.

The invention relates to the technical field of pH value adjustment, and discloses a pH value adjustment method and system, a storage medium and equipment. The method comprises the following steps: denoising time sequence data of a pH sensor to obtain a smooth pH value sequence, and calculating a first-order difference of the smooth pH value sequence to obtain a pH value rate change sequence and rate characteristics; when any value in the sequence exceeds a preset threshold value, extracting feature distribution data, and inputting the feature distribution data and real-time state data of the solution into a solution state evaluation model to obtain an estimated value of the buffer capacity and reaction rate change of the solution; based on the estimated value, the pH value rate change sequence and the rate characteristics, calculating a preliminary control sequence of the acid-base addition amount, adopting a self-adaptive PID control algorithm to adjust parameters, generating an optimal control sequence, controlling the acid-base addition equipment to adjust the addition amount, obtaining new pH value data, and performing fast Fourier transform to obtain a stable pH value sequence. The stability of pH value control of the solution is improved.

The invention discloses a regulation and control system and method of a pH meter in a waste lithium battery recovery process, and relates to the technical field of waste battery recovery treatment. The system comprises a central control module, a liquid caustic soda adjusting device and a liquid acid adjusting device, wherein a pH meter measures the pH value of a leaching solution of a leaching-stage reaction kettle in a waste lithium battery recycling process in real time; the central control module compares the pH value, measured in real time, of the leaching liquid in the leaching-stage reaction kettle with the pH value preset range of the leaching stage, acid liquid or alkali liquid is added into the leaching-stage reaction kettle according to the comparison result, and the pH value of the leaching liquid is adjusted to be within the pH value preset range of the leaching stage; the central control module can also identify interference factors measured by the pH meter and compensate the slope according to the current temperature so as to compensate the pH value, measured by the pH meter, of the leachate. According to the method, accurate control over the pH value in the leaching process can be effectively achieved, the recovery efficiency and quality of the waste lithium batteries are improved, and the production cost is reduced.

The invention discloses a method and system for accurately controlling the concentration of dissolved oxygen (DO) of a sewage treatment aeration unit, and the method comprises the steps: constructing a prediction model, and obtaining a model prediction value of the DO concentration at a current moment or a future moment according to the prediction model; calculating a current confidence coefficient; taking the current confidence coefficient as a weight coefficient, and carrying out weighted fusion calculation on a DO concentration measured value at the current moment and a DO concentration model prediction value to obtain a DO concentration fusion variable; the aeration air volume is adjusted or controlled with the purpose of minimizing the error between the DO concentration fusion variable and the DO concentration target value; the problem of overshoot oscillation caused by DO response lag in traditional control is solved, and a dynamic and accurate control solution is provided for the DO concentration of the aeration unit of the sewage plant.

The invention provides a dissolution medium pH value dynamic regulation and control method and system based on a dissolution instrument. According to the method, the real-time pH value and the dynamic change trend of the release rate of the active component are obtained, then the pH dynamic compensation instruction is generated according to the offset between the dynamic change trend of the release rate of the active component and the preset stage release target curve, and then the release rate of the active component is calculated based on the pH dynamic compensation instruction and the real-time pH value. The injection parameter combination of the buffer solution is calculated, and then the buffer solution corresponding to the concentration of the buffer solution is injected into the corresponding dissolution cup according to the accurate injection amount in the dynamic time window through a multi-channel accurate fluid controller, so that the pH value of the liquid environment is dynamically matched with the transfer stage of the medicine in the gastrointestinal tract of the human body; according to the technical scheme provided by the invention, the problem of measurement drift caused by the fact that a sensor is easily interfered by drug residues or organic solvents in the prior art is effectively solved, and electrolysis errors of a single electrode in a complex medium are also avoided.

The invention belongs to the technical field of sandy ground grouting regulation and control, and relates to a dolomite sandy ground tunnel high-pressure curtain grouting regulation and control method and system. According to the method, the fuzziness and the uncertainty of single sensing information when complex geological conditions are judged and recognized are overcome by generating the sanding rate grade map and the splitting early warning signal, and the accuracy of stratum state sensing is improved; a dynamic linkage mechanism among stratum states, risk early warning, slurry parameters and grouting parameters is established, the slurry proportion and the grouting pressure are automatically and differentially regulated and controlled according to the sanding grade, and optimal matching of the slurry property and stratum requirements and dynamic balance of safety and efficiency are achieved; the formation condition of the curtain is mastered in real time through grouting effect real-time imaging and closed-loop feedback regulation and control, the construction scheme is continuously optimized according to objective data, the uniformity, continuity and overall quality of high-pressure curtain grouting of the sandy stratum tunnel are ensured, and meanwhile material waste and construction period delay are avoided.

The invention discloses a dissolved oxygen closed-loop regulation and control method used in a sewage treatment process. The method comprises the following steps: acquiring real-time dissolved oxygen concentration in a reaction tank through a distributed sensor array, and performing temperature compensation; an online water quality analyzer is used for collecting water inlet flow, chemical oxygen demand, ammonia nitrogen and water temperature to construct a comprehensive input feature vector; establishing a nonlinear dynamic mapping model based on a deep neural network, and outputting a target dissolved oxygen set value changing along with working conditions; an aeration adjusting instruction is generated by adopting a feedforward-feedback composite adaptive fuzzy PID control algorithm; dynamically adjusting the air volume of an air blower and the opening density of a partition aeration disc to match the aerobic rate of microorganisms; and the control performance is evaluated regularly, and a model parameter online optimization mechanism is triggered to continuously improve the setting precision. According to the method disclosed by the invention, the dissolved oxygen can be accurately controlled, so that the aeration energy consumption is reduced by not less than 18%, the control precision is within + / -0.3 mg / L, and the robustness, the automation level and the low-carbon operation capability of the system are remarkably improved.

The invention provides a hydrogen-rich water concentration dynamic adjustment method, and relates to the field of concentration adaptive adjustment, and the method comprises the following steps: S1, data acquisition; step S2, data preprocessing; s3, key influence factors are extracted; s4, acquiring the initial concentration of the hydrogen-rich water; and S5, obtaining the optimized concentration of the hydrogen-rich water: obtaining a dynamic concentration adjustment amount, an extreme environment adjustment amount and an implicit stress adjustment amount through reinforcement learning dynamic optimization, extreme environment adaptation and implicit stress early warning, and obtaining the final concentration of the hydrogen-rich water. According to the method, self-adaptive adjustment of the concentration of the hydrogen-rich water can be performed according to the growth state of the plant and environmental factors, the accuracy of the concentration of the applied hydrogen-rich water is ensured, and the problem that normal growth of the plant is affected due to too high or too low concentration of the hydrogen-rich water is avoided.

The invention relates to an on-line monitoring system for high-concentration chloride ions in solid-containing slurry, and belongs to the technical field of chloride ion monitoring. The system comprises a data acquisition unit used for acquiring prediction data such as the volume of gypsum slurry and the pH value of the gypsum slurry; the data processing unit is used for preprocessing according to prediction data such as the volume and the pH value of the gypsum slurry to obtain preprocessed data; the data prediction unit is used for obtaining a chloride ion concentration prediction value through MLP model calculation according to the preprocessed data; the monitoring control unit is used for calculating a diagnosis result through a diagnosis model according to the chloride ion concentration predicted value, and the intelligent terminal controls a slurry input pipeline valve switch according to the diagnosis result; the intelligent terminal controls a desulfurization slurry output valve to be opened and closed according to the desulfurization slurry output threshold value, a chloride ion concentration measurement value is obtained through calculation of the measurement module, and gypsum solution compensation is conducted according to the chloride ion concentration measurement value. And online monitoring of high-concentration chloride ions in the desulfurization tower and dynamic compensation of the gypsum solution are realized.

The invention discloses a closed-loop control system and method based on deep-sea ore raising pipe ore pulp concentration monitoring, and the system comprises a water surface support platform control center which is used for outputting a control strategy; the hydraulic ore injector is used for receiving the control strategy and carrying out self-adaptive adjustment according to the control strategy; wherein the water surface support platform control center comprises an intelligent control unit and a controller, and the intelligent control unit is used for collecting operation parameter data of the hydraulic ore injector, processing the operation parameter data and predicting in real time to obtain a solid phase volume concentration predicted value; the controller is used for receiving the solid phase volume concentration predicted value and determining a control strategy according to the solid phase volume concentration predicted value; the intelligent control unit comprises a data acquisition module, a data processing module and a prediction module; the concentration of ore pulp in the pipeline can be more accurately controlled through the system, and the system can better adapt to complex working conditions such as submarine topography and ore supply quantity fluctuation.

The invention relates to a sewage treatment method and system, an intelligent terminal and a storage medium, and relates to the technical field of sewage treatment.The method comprises the steps that a water inlet trigger signal of a preset reaction tank is obtained; acquiring water inlet detection parameters of the reaction tank based on the water inlet trigger signal; according to the water inlet detection parameters and the ideal water outlet detection parameters, the set dissolved oxygen concentration of the reaction tank is determined based on similar historical data of a time difference time sequence model; controlling a preset aeration device to aerate the reaction tank according to the set dissolved oxygen concentration; obtaining effluent detection parameters of the reaction tank; judging whether the water outlet detection parameters meet the requirements of preset treatment detection parameters or not, and judging whether the set dissolved oxygen concentration is regenerated or not according to the judgment result; and continuously controlling the aeration device to aerate the reaction tank according to the regenerated set dissolved oxygen concentration. The sewage treatment device has the effects of improving the sewage treatment efficiency and the effluent quality and reducing the sewage treatment cost.

The invention discloses a denitration system capable of automatically adjusting an ammonia spraying strategy, which comprises a data sensing layer and an execution layer, the data sensing layer comprises a plurality of measuring devices arranged at an inlet and an outlet of an SCR (Selective Catalytic Reduction) reactor, the execution layer comprises a plurality of ammonia spraying grids arranged along the section of a flue in a partitioned manner, and each partition corresponds to an independent ammonia spraying branch pipe; an adjustable flow control valve is arranged on each ammonia spraying branch pipe; the control layer is in communication connection with the data sensing layer and the execution layer, and the control layer comprises an advanced controller and is configured to receive real-time data of the data sensing layer and optimize the real-time data on the basis of a preset denitration model and an optimization algorithm; calculating the distribution uniformity index of the NOx concentration at the outlet of the SCR reactor and the target ammonia gas flow required by each partition of the plurality of ammonia spraying grids; and the distributed PID controller is connected with the advanced controller and is configured to receive the target ammonia gas flow of each partition and generate a control signal to drive the corresponding flow control valve, and the total ammonia consumption can be remarkably reduced under the same denitration efficiency.

The invention provides a copper powder purification and iron removal control method based on multi-parameter monitoring, and belongs to the technical field of copper powder processing. The method comprises the following steps that basic information of copper powder to be treated is obtained, and the theoretical dosage Qall of acid liquor is calculated; stirring and mixing the copper powder and pure water; setting a preset batch number n of adding the acid liquor in batches, generating an addition amount Q1 of adding the acid liquor in the first batch and an addition amount Q2 of adding the acid liquor in the second batch, and setting the interval time as t1; monitoring parameters of the mixed system are obtained, and the adding process of the acid liquor in the next batch is dynamically adjusted; and repeating until the concentration of the iron ions in the mixed system tends to be constant, thereby completing iron purification and impurity removal. Accurate iron removal through an acid leaching method can be achieved, the corrosion loss of the copper powder is reduced, and the purity and yield of the copper powder are improved; meanwhile, the addition amount of the acid liquor is accurately controlled, and the subsequent wastewater treatment cost is reduced.

The invention discloses an automatic mixing control device for natural rubber latex and acid liquor. The device is provided with a latex pool (1) and an acid liquor pool (2), a latex pipeline (3) is connected below the latex pool (1), an electromagnetic valve (4) is arranged on the latex pipeline (3), and an electromagnetic flowmeter (6) is arranged at the rear part of the electromagnetic valve (4). An acid liquor pipeline (10) is connected below the acid liquor pool (2), an electric control valve (11) is arranged on the acid liquor pipeline (10), and a turbine flowmeter (13) is arranged at the rear end of the electric control valve (11). The tail ends of the latex pipeline (3) and the acid liquor pipeline (10) are provided with a glue-acid mixing pool (16), a glue-acid mixing pipeline (17) is arranged behind the glue-acid mixing pool pipeline (16), and the tail end of the glue-acid mixing pipeline (17) is provided with a PH value measuring probe (19) and a PH value measuring instrument (18). The device has the beneficial effects that the automation of the latex solidification acid preparation process is realized, the labor cost is reduced, the production efficiency is improved, and the stability of the product quality is ensured.

The invention discloses a water and fertilizer ratio control method and system, and relates to the technical field of water and fertilizer regulation, and the method comprises the steps: collecting the original concentration data of a plurality of liquid storage tanks at the moment and a set target mixing concentration value, and synchronously obtaining the valve opening data of a channel corresponding to each liquid storage tank; inputting the original concentration data and the valve opening data into an initial concentration prediction model to generate a predicted liquid outlet concentration value at the moment under the current mixing combination; acquiring a mixed liquid outlet concentration time sequence set and a valve opening time sequence set from the moment to the moment, and calculating and generating mixed response delay time and concentration inertia response time by combining the target mixed concentration value and the predicted liquid outlet concentration value; generating inertia offset data based on the mixed response lag time and the concentration inertia response time; through a water-fertilizer ratio control mechanism integrating concentration prediction and inertia compensation, dynamic and stable regulation and control of the mixed concentration are realized, and the control precision of the output concentration of the fertilizer liquid is improved.

The invention relates to an active oxygen concentration control method and a brain-computer interface implant accelerated life test system. The accelerated life test system is used for testing the electrochemical performance of a brain-computer interface implant by using a test solution. The method comprises the following steps: detecting a current feedback current corresponding to a current test solution; obtaining the current active oxygen concentration according to the current feedback current and a preset active oxygen concentration and current relation function; generating a filling parameter according to a concentration difference value between the current active oxygen concentration and a preset active oxygen concentration; and adding a hydrogen peroxide solution into the current test solution according to the filling parameters, so that the current test solution reaches the preset active oxygen concentration. According to the method, the active oxygen environment generated by immune reaction in a living body can be simulated through the test solution, the active oxygen concentration in the test solution can be precisely regulated and controlled, and the accuracy of the test result of the brain-computer interface implant is improved.

The invention provides a saline-alkali soil crop multi-water-source irrigation control method and system, and belongs to the technical field of agriculture, and the method comprises the steps: determining an irrigation water salinity target threshold value and a target total irrigation amount according to soil salinity data and crop physiological parameters; determining a water distribution strategy based on the salinity concentration data, wherein the water distribution strategy at least comprises irrigation priorities and collocation of different types of water sources; based on the target irrigation total amount, the irrigation water salinity target threshold value and the water distribution strategy, the target water taking amount of each type of water source is determined; and generating an irrigation control instruction according to the target water intake amount. According to soil salinity, crop types, crop physiological parameters and salinity concentration of multiple water sources, the irrigation water salinity target threshold value and the irrigation water total amount are dynamically and accurately determined; and meanwhile, a priority water distribution strategy is formulated, so that flexible allocation of irrigation among multiple water sources and fine management of the salinity concentration of crop irrigation water can be realized, and soil salinization and crop salinity stress are effectively avoided.

The invention discloses an in-vehicle oxygen content control method, device and equipment, a medium and a program product, and belongs to the technical field of vehicle intelligent control. The method comprises the following steps: in response to vehicle starting, acquiring navigation information of a vehicle, and determining a first oxygen content and a second oxygen content based on the navigation information; under the condition that the first oxygen content is smaller than the second oxygen content, a first difference value is determined, a first duration is determined based on the navigation information, and the first duration is the duration needed by the vehicle to arrive at a navigation destination from a navigation starting place; determining a corresponding oxygen content change rate from the navigation starting place to the navigation destination based on the first difference value and the first duration; and controlling oxygen content adjusting equipment of the vehicle to adjust the oxygen content in the vehicle according to the oxygen content change rate. According to the invention, passengers can be effectively helped to gradually adapt to the low-oxygen environment in the vehicle driving process.

The invention provides an intelligent gas supplementing method for GIS mixed gas, and relates to the technical field of operation and maintenance of high-voltage electrical equipment. According to the method, the pressure, temperature, humidity and mixed gas component concentration of the gas-insulated metal-enclosed switchgear are collected in real time through an intelligent sensor, and a temperature-pressure reference model is established for temperature compensation and leakage judgment; when the pressure deviation exceeds a threshold value, calculating the total amount of leaked gas and the gas supplementing demand quantity of each component, automatically supplementing gas according to a target proportion, and stopping gas supplementing after the pressure and the component concentration reach a target interval; the data of the whole gas supply process is used for model adaptive optimization, precise detection and intelligent gas supply of GIS mixed gas are realized, and the monitoring precision, the control reliability and the system self-optimization capability are improved.

The invention discloses a liquid supplementing optimization method of a cleaning machine, and relates to the field of cleaning machines, and the method comprises the following steps: determining a target liquid medicine component to be subjected to liquid supplementing optimization in the cleaning machine, setting a concentration continuous monitoring period of the target liquid medicine component, and collecting concentration change data of the target liquid medicine in a workpiece processing process in real time through a concentration sensor; by collecting the concentration change and volume consumption data of the target liquid medicine in real time, the average volume consumption rate is accurately calculated, scientific data support is provided for liquid supplementation, and blind liquid supplementation is avoided.

A scale assessment system and a method for performing a scale deposit assessment that includes a scale solution flow loop. The scale assessment system also includes an insulated temperature controlled scale solution holding tank, a scale deposit assessment flow loop, a scale inhibitor flow loop, and / or a measurement and control unit configured to determine one or more of an amount of scale deposit in a plurality of connected U-shaped test pipes and an amount of scale inhibitor required to prevent scale deposit in the plurality of connected U-shaped test pipes.

The invention relates to the technical field of production process monitoring, in particular to a manufacturing process of a chicory compound preparation, which comprises a data acquisition module, a data processing module, a data processing module and a processing module, obtaining to-be-analyzed pH data, a characteristic temperature window, a characteristic pH window, a reference temperature window and a reference pH window corresponding to the tth monitoring moment; the drift anomaly identification and correction module is used for carrying out drift anomaly identification and correction on the to-be-analyzed pH data corresponding to the tth monitoring moment to obtain target pH data corresponding to the tth monitoring moment; and the pH monitoring and adjusting module is used for monitoring and adjusting the pH in the chicory compound preparation production and manufacturing container at the t monitoring moment according to the target pH data corresponding to the t monitoring moment. And the pH value in the endive compound preparation production and manufacturing container at the t monitoring moment is monitored and adjusted according to the corrected pH value data, so that the adjusting effect can be improved or guaranteed.

Techniques for monitoring a pharmaceutical manufacturing process and making determinations regarding the release of radiopharmaceuticals to health care providers. A data processing system collects data across multiple batches of radiopharmaceuticals, across multiple entities, and / or across multiple stages of the manufacturing process, processes the data, and provides feedback to entities involved in the manufacturing process. In scenarios where quality assurance tests are conducted, data is collected from radiopharmaceutical products before they are shipped, and the data is analyzed to provide the recipients with an indication of whether the radiopharmaceutical products satisfy quality assurance standards. Techniques for analyzing information about a batch manufacturing process and, when a problem occurred during a manufacture of a batch, determining whether to continue to manufacture a next batch in time for delivering and administering to a patient. The detected problem may be investigated and remedied before or during the synthesis of the next batch.

The utility model discloses an anti-corrosion control system for a low-temperature methanol washing process, which comprises an alkali liquor adding tank used for storing and preparing alkali liquor with the concentration of 2%; the alkali liquor filling pump is connected to the alkali liquor dosing tank and is used for conveying the prepared 2% alkali liquor to an ammonia washing tower and a methanol-water separation tower in the production system; the alkali liquor dosing tank liquid level meter is arranged on the alkali liquor dosing tank and is used for monitoring the liquid level in the alkali liquor dosing tank in real time and sending out an alarm and interlocking protection signal; the DCS control system is used for automatically controlling the supplement amount of alkali liquor according to preset program setting and ensuring safe operation, the alkali liquor filling pump and the alkali liquor dosing tank liquid level meter are both connected with the DCS control system, 1-2% of alkali liquor is supplemented through online continuous operation, the PH value of condensate of the methanol-water separation tower and the ammonia washing tower is controlled to be 7-8, and therefore the problem of equipment corrosion is solved.

A method, an apparatus, and a computer program for controlling a process for manufacturing pulp, paper, or board. Dosing of a chemical agent into a fiber suspension during the process is automatically controlled by a rule engine. The rule engine receives a plurality of measurement values related to the process and maintains a plurality of rule sets including an active rule set. Each rule set defines how the dosing depends on the measurement values. The rule engine controls the dosing of the chemical agent based on the measurement values and the active rule set, records at least a part of the measurement values and the actual dosing amount of the chemical agent, and receives at least one rule set candidate. Based on the previous measurement values, the dosing of the chemical agent is simulated using the received at least one rule set candidate, and a simulation result for optimizing the performance of the chemical agent in the process is output.

The invention discloses an environment simulation human body metabolism cabin oxygen concentration control method which comprises the following steps: eluting oxygen through an oxygen scrubber system so as to reduce the oxygen concentration in air, and then inputting treated gas into a buffer cavity; the first gas pressure sensor collects gas pressure data in the pressurizing box so as to monitor the current gas pressure level; the low-oxygen air in the buffering cavity is pumped into the pressurizing box through the pressurizing pump, so that the air pressure is increased; the pressurization controller adjusts the pumping rate according to the air pressure difference to ensure that the air pressure reaches a preset value; the second gas pressure sensor collects gas pressure data of the metabolism cabin and compares the gas pressure data with the data of the first gas pressure sensor; if the air pressure meets the requirement, the low-oxygen air in the pressurizing box is input into the metabolism cabin; and the second gas pressure sensor continues to collect the gas pressure data in the metabolism cabin to ensure that the gas pressure is maintained at a proper level.

The present invention relates to methods of cracking hydrocarbon feeds, and in particular provides a method for transitioning from a first process cracking a first hydrocarbon feed to a second process cracking a second hydrocarbon feed, wherein: a) The first process comprises a. passing the first hydrocarbon feed to a reactant tube which reactant tube comprises a first zone and a second zone, downstream of the first zone, each zone comprising one or more electrically heated sections. b. heating the first hydrocarbon feed in the first zone in the one or more electrically heated sections to vaporise the first hydrocarbon feed, and c. heating the vaporised first hydrocarbon feed in the second zone in the one or more electrically heated sections to crack the first hydrocarbon feed, wherein the number of heated sections in the first zone is n1, the number of heated sections in the second zone is n2. and n1 + n2 is equal to n, where n it the total number of heated sections. b) The transition comprises stopping the feeding of the first hydrocarbon feed to the reactant tube and starting the feeding of the second hydrocarbon feed to the same reactant tube, and c) The second process comprises a. passing the second hydrocarbon feed to the reactant tube which reactant tube comprises a first zone and a second zone, downstream of the first zone, each zone comprising one or more electrically heated sections, b. heating the second hydrocarbon feed in the first zone in the one or more electrically heated sections to vaporise the second hydrocarbon feed, and c. heating the vaporised second hydrocarbon feed in the second zone in the one or more electrically heated sections to crack the second hydrocarbon feed. wherein the number of heated sections in the first zone is ml, the number of heated sections in the second zone is m2, and m1 + m2 is equal to n, and wherein the second hydrocarbon feed is different to the first hydrocarbon feed, m1 ≠ n1 and m2 ≠ n2.

A misting device for aeroponically cultivating plants in a growing chamber provided with fluid in a water reservoir, comprising: an ultrasonic atomization transducer (UAT) configured to generate a misting spray in the presence of fluid; and a wicking means configured to transport fluid from the water reservoir by capillary action to the ultrasonic atomization transducer, when the lower end of the wicking means is disposed in contact with the water reservoir. Also disclosed is a growing system for aeroponically cultivating plants comprising: a growing chamber for containing the plants, and provided with a water reservoir containing fluid; and misting devices. The misting devices are oriented such that the respective misting sprays interact with each other to create an ultra-fine mist inside the growing chamber. In some aspects, the water reservoir may further comprise nanobubbles to maintain elevated dissolved oxygen levels and improve root-zone oxygenation.