219results about How to "Change concentration" patented technology

The invention relates to a device and a method for preparing gel microspheres with uniform grain sizes. The outlet ends of a micro-dosage syringe pump and a constant-flow pump of the device are connected with a syringe needle and a stand tube through a hose respectively, a stand in the stand tube inserts and fixes the syringe needle at the position of a center shaft of a capillary glass tube, and the stand tube is communicated with the capillary glass tube. The method comprises the following steps: connecting a container with an oil phase into the inlet end of the constant-flow pump, setting the flow rate of the constant-flow pump, and introducing the oil phase into the stand tube through the hose to ensure that the oil phase flows into the capillary glass tube; filling dispersed phases into a syringe tube of the micro-dosage syringe pump, setting the flow rate of the pump, and introducing the dispersed phases into the syringe needle to ensure that the dispersed phases flow into the capillary glass tube; and collecting the oil phase containing dispersed phase liquid drops by using a glass container at the tail end of the capillary glass tube, solidifying dispersed phase droplets, and washing the mixture to remove the oil phase so as to obtain the gel microspheres with uniform grain sizes. The device and the method have a simple process and can prepare the microspheres with the grain sizes between 10 and 50 microns, and the prepared gel microspheres can be widely used for embedding enzymes, cells or microorganisms and the like.

A method of real time process control in a reaction system for the procuction of acetic acid from the carbonylation of methanol. Raction system samples are collected from columns (30, 40, 50, 60, 70, 80) and/or transfer lines (120, 130, 140, 150, 160, 170, 180, 184, 186, 188, 190, 192, 194, 196, 197, 198, 199, 200, 210, 220) downstream of a reactor vessel (10), and the concentration of one or more components in the sample is measured by an infrared analyzer (90). The concentration measurements are then used to make adjustments in the concentration of components in the reaction system, directly or indirectly, such as by adjusting the temperature profile in a particular column (30, 40, 50, 60, 70, 80), the flow rate of solution in to or out of a column (30, 40, 50, 60, 70, 80), the vent gas rate out of the reactor (10) or a column (30, 40, 50, 60, 70, 80), or the addition or extraction of a component to or from the solution. For optimum process control, the measurements are transmitted to a control unit for real time analysis, and the adjustements are made substantially instantly after the infrared analysis.

The invention relates to the field of liquid metal, in particular to a method for dispersing liquid metal to micro nano-particles. The method comprises the specific steps that high molecular polymer is dissolved in N,N-dimethylformamide (DMF), and a polymer solution is obtained; the liquid metal is dripped into the polymer solution, stirring is conducted, and the metal liquid is dispersed to the micro nano-particles. By means of the method for dispersing the liquid metal to the micro nano-particles, the liquid metal can be dispersed to the micro nano-particles without obvious agglomeration and sediment within 50 h; the liquid metal can be efficiently dispersed within a short time, and a method for preparing base materials is provided for printing the liquid metal.

The invention discloses a safety monitoring and controlling method for li-ion power battery thermorunaway and a device thereof. When a li-ion power battery suffers from thermorunaway, a composite medium with cooling and fire-extinguishing effects is used as a safety monitoring and controlling medium to enter a power battery box or battery tank in an injection mode. The safety monitoring and controlling medium is composed of chemical substances which are formed by C, F, H and O elements and have cooling and fire-extinguishing effects. A li-ion battery safety monitoring and controlling device based on the above safety monitoring and controlling method comprises a shell and a safety monitoring and controlling medium filling port, a pressure meter connector, a nozzle and a safety valve pressure relief opening which are arranged on the shell. The safety monitoring and controlling device can effectively prevent or reduce the li-ion battery thermorunaway risk, reduce fire probability of the li-ion battery box (tank), control and extinguish initial fire, and has functions of starting operation for many times and extinguishing re-ignited fire of the power battery box.

Methods for characterizing a biochemical reaction and analysis of reaction products by establishing continuously variable concentration gradients of one or more reagents of the biochemical reaction are provided. Methods for determining mechanism of inhibition or activation, potency of inhibition or activation, or both of an enzyme inhibitor or activator, respectively, are also provided. The continuously variable concentration gradients can be established in a microfluidic chip.

The fast detection method and instrument for microbe content in food has two parallel sample detecting systems adopted, including one for food sample detection and the other for detecting contrast. These two systems are in the same environment conditions and heated with the same heating element, the CO2 these two systems generate is detected separately in two identical CO2 detecting devices, and the detected data are analyzed and processed to obtain the detection result. The present invention has short detection period, simple structure, low cost and other advantages, and is suitable for fast site detection.

A method and apparatus for non-invasively measuring concentration of a target substance such as glucose within a body by: activating a pulse source to apply to the body a series of pulses of energy highly absorbable by the target substance to generate, by the photoacoustic effect, a series of acoustic waves propagated through an acoustic channel in the body; detecting the acoustic waves to produce an electrical signal having a frequency corresponding to the frequency of the acoustic waves generated by the photoacoustic effect; controlling the pulse source to change the frequency at which the energy pulses are applied to the body such that the detector detects a whole integer number of wavelengths in the acoustic channel irrespective of variations in the target substance concentration within the body; and utilizing a measurement of the frequency, or change in frequency, of the pulses to produce a measurement of the concentration, or change in concentration, of the target substance.

The invention discloses a drink preparation device, belonging to the field of machinery. The drink preparation device is mainly used for blending overheated hot water in a hot water pipe with cold water of a set flow rate in a cold water pipe to form a blended water flow with suitable temperature, and transmitting the blended water flow into a liquid dispenser. When a brewing solenoid valve is controlled to be opened, the liquid dispenser dispenses the blended water flow with suitable temperature to a preparation container in which drink components are previously provided so as to prepare drink from the drink components; and when the brewing solenoid valve is controlled to be closed, the liquid dispenser dispenses the blended water flow with suitable temperature to a hot water feeding pipe, and the blended water flow with suitable temperature is directly fed into the drink when a hot water feeding solenoid valve is controlled to be opened. When the brewing solenoid valve and the hot water solenoid valve are both closed, the hot water in a heat exchanger volatiles, passes through a preheating circulation line, and returns to a heat exchanger after being preheated by the liquid dispenser so as to form a preheating circulation.

The invention relates to a cigarette filter enabling users to freely select ventilation rate. A cigarette filter strand fiber is formed by being wrapped by forming paper, and then is wrapped with tipping paper. The tipping paper has two layers, the tipping paper in contact with the forming paper of the filter is inner layer tipping paper, and the layer outside the inner layer tipping paper is outer layer tipping paper. The inner layer tipping paper is provided with a regular punching area at the middle section, and the surface of the area in contact with the outer layer tipping paper is a smooth surface containing a film. The outer layer tipping paper is provided with adhesive tape strips torn respectively repeatedly at the punching area corresponding to the inner layer tipping paper, and the inner side of the outer layer tipping paper in contact with the punching area of the inner layer tipping paper is coated with adhesive. Adhesive can be torn conveniently, original air holes in the inner layer tipping paper are exposed, and thus the ventilation rate of the filter is changed. The effect of adjusting smoke concentration is achieved finally, and different satisfaction feelings on cigarette smoke are achieved.

A method of manufacturing a field effect transistor of the present invention includes: applying a coating liquid 20 containing a solvent 13 as well as first and second organic molecules 11 and 12 that have been dissolved in the solvent 13; and forming a first layer and a second layer by removing the solvent 13 contained in the coating liquid 20 that has been applied. The first layer contains the first organic molecules 11 as its main component. The second layer adjoins the first layer and contains the second organic molecules 12 as its main component. The first organic molecules 11 are a semiconductor material or a precursor of a semiconductor material. The second organic molecules 12 are an insulator material or a precursor of an insulator material. The first organic molecules 11 and the second organic molecules 12 are not compatible with each other.

Provided is an oscillatory type sewage sedimentation basin, which utilizes a tilting system to tilt a movable basin, so as to generate gradient tangential deformation and resonance on raw water, promote a flocculation reaction and improve sewage treating effect, and an operation method thereof. The movable sedimentation basin is jointed with a pedestal hinge and can tilt around the hinge under a tilting operation of the tilting system. When sewage reaches a destabilization critical state, the tilting mechanism is started to tilt the movable basin to generate gradient tangential deformation on the raw water and promote the flocculation reaction. A basin tilting period is controlled to generate resonance oscillation on the raw water. The resonance promotes fully conduction of the flocculation reaction, so as to purify the raw water repeatedly, separate the settlement thoroughly and reduce suspensions. The settlement progress consumes a short time and energy, has good effect and low costs and is green, environment-friendly and easily operated.

A process for the separation of pentavalent arsenic from an aqueous solution using an N-alkyl pyridinium-containing adsorption medium is disclosed. An oxidizing medium and process for the oxidation of trivalent arsenic to pentavalent arsenic with removal of the pentavalent arsenic so formed is also disclosed.

The present invention discloses a drug administration device for a periodontitis treatment and belongs to the technical field of medical appliances. The drug administration device comprises an air compression assembly, a drug storage tank, a shell body, a flow guide pipe and a drug administration assembly, the shell body is arranged on the drug storage tank, the air compression assembly is arranged on the shell body, one end of the flow guide pipe is arranged in the drug storage tank, and the other end of the flow guide pipe is inserted and matched with the drug administration assembly. A plurality of drug administration spraying nozzles are arranged on a positioning rubber sleeve to spray medicines on an inner side and an outer side of a user, when the inner side of the gingiva needs medicine spraying, teeth of the patient abut against a liquid outlet pipe to enable multiple medicine liquid tanks to rotate by 180 degrees on the positioning rubber sleeve, the liquid outlet pipe faces the inner side of the gingiva of the user when the positioning rubber sleeve is placed in the oral cavity, therefore, contact by hands or turning by medical tools is prevented and risks of saliva dripping and pathogenic microorganism infection caused by exposure of the positioning rubber sleeve entering the oral cavity of the patient to air are effectively avoided.

A method for preparing micro-nano Ag2O with controllable shape and size relates to a micro-nano Ag2O, particularly to a method for realizing the controllable growth of the micro-nano Ag2O in shape and size by changing the concentration of the reactants. The invention provides a method for changing the reactants concentration from the whole and realizing the controllable growth of the micro-nano Ag2O in shape and size, which is a method for preparing micro-nano Ag2O with controllable shape and size. Mix AgNO3 and ammonia at the Moore ratio of 1:(0.2-10) to produce a mixture A of AgNO3 and ammonia. Add NaOH into the mixture A till the mixture A produces deposit. Stir the mixture and put it still to produce the mixture B. Centrifugate the mixture B and wash the deposit with water and alcohol for at least once in sequence to produce the target product.

The invention provides a water electrolysis hydrogen production control method and system and a controller. According to the scheme, the method comprises the steps: controlling the working state of an electrolytic cell according to the concentration of hydrogen generated by the electrolytic cell, and controlling the on-off state of at least one power switch when the concentration of hydrogen exceeds a target concentration range so as to adjust the number of electrolysis cells participating in hydrogen production in the electrolytic cell; equivalently, the power required by the electrolytic cell is adjusted so that the hydrogen concentration generated by the electrolytic cell is changed, and finally, the hydrogen production concentration of the electrolytic cell is stabilized within a target concentration range. According to the scheme, the working state of the electrolytic cell is dynamically adjusted according to the hydrogen production concentration of the electrolytic cell, electric energy generated by a renewable energy power generation system in a weak power generation area is fully utilized, and hydrogen yield and hydrogen purity are improved.

The invention discloses a photo-induced hydrogen passivation and defect repair device for an LED (Light Emitting Diode) silicon solar cell. The device comprises a test bed for placing the silicon solar cell and keeping the temperature constant, and further comprises an LED light source system, an optical convergence system and a controller, wherein the LED light source system comprises an LED array for emitting light; the optical convergence system is arranged on a light emitting path of the LED array, and is used for converging the light emitted by the LED array to a detection area of the test bed; and the controller is used for modifying the parameters of the light emitted by the LED array as well as analyzing and calculating the passivation and defect parameters of the silicon solar cell. The device improves the conversion efficiency of the solar cell by passivating impurity defects in crystalline silicon, passivating a silicon material and repairing lattice defects such as dislocation in a polycrystalline silicon material.