375 results about "Gas exchange" patented technology

The invention provides an NMP (N-Methyl Pyrrolidone) purification process based on an NMP rectification system, the process is completed by matching a tail gas desorption tower, the space in the tower is divided into an adsorption bin and a desorption bin by arranging a middle box body, two groups of adsorption devices capable of alternately entering the two bins are mounted, and automatic switching of the adsorption devices is realized by utilizing a driving mechanism; when the adsorption efficiency of one group of adsorption devices is reduced, the adsorption devices are automatically transferred to the desorption bin for regeneration treatment, meanwhile, the other group of adsorption devices enter the adsorption bin to continue working, and in the desorption process, low-pressure saturated steam and hot nitrogen are adopted for purging, so that residual moisture is effectively removed, and the adsorption activity is recovered; compared with the prior art, the process has the advantages that gas exchange in the adsorption and desorption process is reduced, the sealing performance and the air pressure balance control capability of the system are improved, the process ensures continuous production, meanwhile, the energy consumption and the discharge pressure are remarkably reduced, and the NMP purification efficiency and the product quality are improved.

The invention discloses an enhanced denitrification method and device for a constructed wetland with a high-void-ratio filler, and aims to create favorable conditions for deep nitrification by screening light materials and constructing a high-low-high gradient resistance layer and inducing flow velocity differentiation to form an oxygen concentration fluctuation zone. Function switching type microorganisms with nitrification-denitrification bidirectional conversion capacity are cultured, and a seasonal flora switching mechanism and a complementary symbiotic network are established to adapt to annual temperature change; multi-point distributed water supply is designed to form a river branch type water flow path, and bionic water flow distribution is achieved; the periodic change of the water level of pulsating water inlet is used for driving gas exchange in the filler to form a tidal breathing effect, and deep oxygen supply can be realized without mechanical aeration; and real-time monitoring is carried out based on an intermittent operation time table, and operation parameters are dynamically optimized. According to the invention, the problems of limited oxygen transfer and seasonal performance fluctuation of the traditional constructed wetland are solved, and a technical scheme with low energy consumption and high stability is provided for nitrogen-containing wastewater treatment.

The invention relates to a bioreactor (100) adapted for culturing animal cells, comprising: a vessel (110) defining a cultivation volume (111); at least two gas exchange devices (120) protruding in the vessel (110), each gas exchange devices (120) having a gaseous exchange surface (121) in the vessel (110); and at least one media inlet (130) and at least one media outlet (135), said media inlet (130) and outlet (135) being configured to operate simultaneously. The invention also relates to methods, cell biomass obtained from these methods and edible food products including this biomass.

The invention discloses a compensation method and system for continuously, rapidly and accurately measuring the radon concentration in air, and the method comprises the steps: taking the number of nuclides in a measurement cavity at the initial moment of a current sampling period as an initial value, and obtaining a time-varying function of the number of nuclides in the measurement cavity in combination with a gas exchange and nuclide decay model; determining the theoretical total count of alpha particles in the current measurement period, and establishing a relational expression between the count of the alpha particles and the number of nuclides; based on the relational expression and the actual measurement count, the number of environmental radon atoms is obtained, and the radon concentration is calculated in combination with a radon decay constant; and finally, combining the number of radon atoms at the current sampling point and a model containing gas exchange and nuclide decay to obtain the nuclide number at the end of sampling, taking the nuclide number as the initial state of the next sampling period, switching the sampling points, and repeating the steps to realize continuous, rapid and accurate sampling. According to the method, through loop iteration, the balance waiting time is effectively saved, and continuous, rapid and accurate measurement of the radon concentration in the environment by a single radon measuring instrument is realized.

The invention provides a high ventilation method for maintaining equal carbonic acid through exogenous CO2 gas and a breathing device. Belongs to the technical field of gas exchange. The method comprises the steps that physiological monitoring data of a patient are collected in real time, and meanwhile parameters of a breathing machine are obtained; inputting the collected data into a pre-trained time sequence prediction model; performing data fusion based on the EtCO2 predicted value, the currently actually measured physiological data and the static parameters of the patient to form a comprehensive evaluation result; and through a control algorithm, an incremental adjustment instruction of the exogenous CO2 supplementary flow is obtained through calculation based on the comprehensive evaluation result. The CO2 demand is estimated in real time through a dynamic prediction model, static estimation is replaced, and the control accuracy and the response speed are remarkably improved; through a multi-modal data fusion technology, dynamic and static physiological parameters are comprehensively applied, so that a control strategy can better reflect the individualized physiological status of a patient.

The invention provides a PMP polymer breathable film and a preparation method thereof. The preparation method specifically comprises the following steps: step 1, PES particle activation; 2, preparing a GO dispersion liquid and a polymer solution; 3, mixing the activated PES particles with a GO dispersion liquid and a polymer solution in sequence for modification; 4, preparing a spinning solution; 5, spinning to form a film; step 6, carrying out ultraviolet lithography; 7, sterilizing after a potential regulator and irradiation; through material compounding, gradient pore-foaming agent design, bionic modification and multi-process cooperation (plasma treatment, ultraviolet crosslinking and micro-channel photoetching), the air permeability, the mechanical strength, the biocompatibility and the structural controllability are obviously superior to those in the prior art. The innovation point of the composite membrane is that efficient gas exchange, long-term stability and low biological risk can be realized by directly aiming at the defects of the traditional PMP membrane, especially in the fields of artificial lung and hemodialysis.

The invention belongs to the technical field of biomedical materials, and particularly relates to a poly-4-methyl-1-pentene (PMP) gas-blood exchange membrane for an extracorporeal membrane oxygenation (ECMO) system, which realizes a long-acting antithrombotic function through a bionic interface construction technology. The invention aims to provide a bionic antithrombotic PMP gas-blood exchange membrane based on zwitter-ion gradient grafting, and through material and process innovation, the following problems existing in a traditional ECMO gas-blood exchange membrane: an antithrombotic coating is easy to fall off, and the long-term effect is insufficient; the risk of blood injury caused by dependence on heparin or anticoagulants; and the surface modification process destroys the membrane pore structure and air permeability.

The utility model discloses a scavenging valve and an atomizer, and the scavenging valve comprises: a support member provided with a cavity; a ventilation channel is formed in the cavity and comprises a first channel and a second channel; the switch piece is arranged in the cavity; the switch piece is provided with a first lip edge part and a second lip edge part; in a natural state, the first lip edge part and the second lip edge part are configured to be attached to the supporting piece so as to close the first channel and the second channel; in the ventilation state, one of the first lip edge part and the second lip edge part is attached to the supporting piece, the other lip edge part is at least partially separated from the supporting piece, then one of the first channel and the second channel is selected to be open, and the other lip edge part is kept closed. The two ends of the scavenging valve are communicated through the scavenging channel, and the movable part of the switch piece can be used for separating or communicating the scavenging channel, so that the scavenging valve can be communicated with the liquid storage cavity and the outside of the liquid storage cavity, pressure balance is realized through gas exchange, and the leakage risk and the dry burning risk of the aerosol matrix are reduced.

The utility model discloses a blood extracorporeal circulation device, which belongs to the technical field of blood extracorporeal circulation equipment and comprises an inner tube and an outer tube, the inner tube and the outer tube are integrally nested, one end of the outer tube is connected with an air inlet tube, the air inlet tube is communicated with oxygen inlet equipment, and the other end of the outer tube is connected with an air outlet tube. A temperature changer and a flow speed controller are connected between one end, far away from the air outlet end, of the outer pipe and the oxygen inlet equipment; one end of the inner tube is a liquid inlet end for transporting blood, the other end of a blood inlet of the inner tube is a liquid outlet end, and the liquid outlet end is connected with a temperature sensor, an oxygen saturation sensor, a blood pump and a microembolus filter; the part, in the outer pipe, of the inner pipe is made of a gas exchange membrane material, and the liquid inlet end of the inner pipe is opposite to the gas inlet pipe of the outer pipe. The blood temperature rising process is safer, meanwhile, in the blood temperature rising process, the oxygen saturation index in the blood can be directly adjusted, the blood oxygen value is simple, convenient and controllable on the basis of convenient temperature rising, temperature control and oxygen saturation of in-vitro blood circulation are carried out at the same time, and operation is easy and safe.

A first chamber and a second chamber are formed between the two ends, in the first direction, of a medium exchange module and a shell, a gas inflow cavity and a heat medium inflow cavity are formed between one end, in the second direction, of the medium exchange module and the shell, and a gas outflow cavity and a heat medium outflow cavity are formed between the other end and the shell. Two ends of the first / third gas exchange pad are respectively communicated with the first and second chambers, two ends of the second gas exchange pad are respectively communicated with the gas inflow / outflow cavity, and two ends of the heat exchange pad are respectively communicated with the heat medium inflow / outflow cavity. The first cavity is communicated with the gas inflow cavity, the second cavity is communicated with the gas outlet, the gas inflow cavity is communicated with the gas inlet, the thermal medium inflow cavity is communicated with the thermal medium inlet, and the thermal medium outflow cavity is communicated with the thermal medium outlet.

The invention belongs to the technical field of organoid culture, and particularly relates to a pulmonary alveolar organoid with an endogenous vascular network and a construction method of the pulmonary alveolar organoid. Aiming at the problems that mesoderm and endoderm are difficult to induce at the same time, the operation process is long, the difficulty is high and the like when a vascularized alveolar organ is constructed by an existing method, the invention provides the construction method of the alveolar organ with the endogenous vascular network. The method comprises the following steps: simultaneously and directionally inducing and differentiating human induced pluripotent stem cells (hiPSC) into fixed endoderm and mesoderm, anterior intestine endoderm, abdominal side anterior intestine endoderm and lung progenitor cells by adopting a one-step method, and promoting endothelial cell proliferation in an endogenous induced differentiation process through a specific growth factor combination. A functional vascular network is formed; and vascularized alveolar organs are induced to be generated. According to the invention, a qi-blood barrier structure in which vascular endothelial cells and pulmonary epithelial cells are tightly connected is successfully reproduced, the gas exchange function of lung tissues can be simulated, and a new way is provided for construction of vascularized alveolar organs.

A system for cleaning, zeroing, and preventing air pollution in indoor space includes several gas detection devices, a central control monitoring device, and several gas exchange and filtration devices. The gas detection devices detect and output indoor and outdoor air pollution data. The central control monitoring device receives the outdoor and indoor air pollution data to perform an intelligent computation and comparison, locate an air pollution location in the indoor space, and transmit a control command intelligently. Each of the gas exchange and filtration devices is combined with a smart switch for the control command to control the gas exchange and filtration devices to be enabled, so that the air pollution is filtered and exchanged by the gas exchange and filtration devices, thereby allowing the indoor air pollution data detected by the gas detection devices in the indoor space to be a safety detection value.

The application discloses an active closed one-way valve, a gas exchange mechanism, a gas exchange insole and a shoe sole, and relates to the technical field of shoe structure. The active closed one-way valve comprises a valve body, an end plate arranged at the exhaust end of the valve body, and an elastic cap covering the end plate. A convex part is arranged on the outer end surface of the end plate, and air holes are distributed around the convex part. An exhaust hole corresponding to the position of the convex part is arranged on the elastic cap. The elastic cap is pressed against the convex part and blocks the exhaust hole by the convex part. The elastic cap can be deformed outward to move away from the convex part under the pressure of the outward exhaust gas flow of the one-way valve, so as to open the exhaust hole. The application has the advantages of simple structure, easy implementation, low failure rate and better durability. Moreover, the elastic cap is pressed against the convex part and fixed around the convex part. The gas flow in the valve body needs to accumulate to a certain pressure to break the elastic cap and flow out from the exhaust hole. In this way, the gas flow can be accumulated and pressurized in the valve body, so that the finally sprayed gas flow of the one-way valve is more concentrated, and the flow rate is faster.

The invention discloses a trace water vapor removal device and method based on a membrane permeation technology, and relates to the technical field of online total sulfur analysis, the trace water vapor removal device specifically comprises a membrane drying assembly, the membrane drying assembly comprises a through exchange cavity, a top cover and a bottom cover, the through exchange cavity serves as the center, the top cover is fixed to the top of the through exchange cavity through a bolt, and the bottom cover is fixed to the bottom of the through exchange cavity through a bolt; a bottom cover is fixed at the bottom; an intelligent adjustment and efficient dehydration structure is adopted, the humidity of reaction gas is monitored in real time through a humidity sensor, data are fed back to an external controller, and intelligent linkage adjustment of the opening size of the movable ventilation pipe and the power of the circulating pump is achieved; the dynamic regulation and control mechanism can automatically optimize the flow rate of purge gas and the water-gas exchange area according to the actual humidity change, and it is ensured that the efficient and stable dehydration effect can be achieved under different working conditions.

Provided are methods and systems for measuring lung function, such as shunt and deadspace, using pulmonary gas exchange in management and treatment of pulmonary diseases including COVID-19.

The present invention relates to a method and apparatus for exchanging gas between two exchange media using an exchange chamber (1) disposed within the housing of an exchange unit, wherein the exchange chamber (1) is divided into two chamber regions by at least one membrane (2), in which the first side of the membrane (2) is in contact with the first exchange medium in the first chamber region, and the second side of the membrane (2) is in contact with the second gaseous exchange medium in the second chamber region, the first chamber region having a connection for the first exchange medium, the first chamber region being incorporated into a first conduit (3) by this connection, and the first exchange medium being passed through the first chamber region using the first conduit. The second chamber region has a connection for a second gaseous exchange medium, and by this connection the second chamber region is incorporated into the second conduit (4), and the second exchange medium can be guided through the second chamber region using the second conduit, and the gas to be exchanged can be transported across the membrane (2) by diffusion, and the apparatus has a pressure generator (9a), and the pressure generator (9a) can be used to generate a pressure difference of at least 10 mmHg of the second exchange medium relative to the ambient atmospheric pressure in the second chamber region, and at least one membrane (2) is permeable to diffusion with respect to the gas to be exchanged, but impermeable to convection.

The invention discloses a gas exchange device in front of a sample introduction cone of an inductively coupled plasma mass spectrometer, the gas exchange device in front of the sample introduction cone is arranged outside an ICP torch tube in a sleeving manner, and the gas exchange device in front of the sample introduction cone is mounted on a partition plate around the sample introduction cone; the sample injection cone front gas exchange device comprises a porous breathable layer and a shell; an argon inlet is formed in one end, close to the sample introduction cone, of the shell; one end, far away from the sample introduction cone, of a space between the porous breathable layer and the ICP torch tube is opened and is communicated with the atmosphere. According to the invention, the environmental gas components in the space between the ICP torch tube and the mass spectrum interface device are exchanged into the preset clean gas, so that the sample ionization process is not interfered by the environmental air components, a lower noise baseline is obtained, and meanwhile, the generation of environmental component ions such as nitrogen oxide ions which possibly interfere mass spectrum analysis is reduced; the sensitivity of mass spectrometry detection and the environment anti-interference capability are improved.

The utility model discloses a valve and a charging device. The valve comprises a driving part and a connecting part connected with the driving part. One end, far away from the connecting part, of the driving part is inwards concavely provided with a ventilation cavity extending into the connecting part. A ventilation groove communicating with the ventilation cavity is formed in the side wall of the connecting part, and a first screw joint part is arranged on the side wall of the connecting part. The valve can ensure the air exchange between the interior of the charging device and the exterior of the charging device, and ensures the sealing performance.

A method for enabling gas exchange and chemical reactions with one or more liquid streams contained in a reactive process vessel are provided. One or more exchange layers within the process vessel can be composed of both collector media and releaser media. The exchange layers allow elements to facilitate increased performance of vessel operations by promoting gas component mixing and diffusion. Improved rates of gas component exchange mean less coking and more gas components available for reaction.

The utility model provides a dynamic box detection system for measuring gas exchange between a plant and the atmosphere, and relates to the technical field of detection of gas released or settled by the plant, the system comprises a blank control box and a plant box for accommodating the plant, and the plant box is communicated with a first gas inlet pipe and a first gas outlet pipe; a second air inlet pipe and a second air outlet pipe are communicated in the contrast box; the air pump communicates with the first air inlet pipe and the second air inlet pipe and is used for supplying air with the same concentration to the two box bodies at the same time. The gas analyzer is communicated with the first gas outlet pipe and the second gas outlet pipe, the gas concentration in the contrast box and the plant box is detected through the gas analyzer, meanwhile, the gas inlet flow rate and leaf area data are collected, and the gas release or sedimentation rate between the plant and the atmosphere is calculated through a formula; the system can quickly and effectively reflect the rate of gas exchange between the plant and the atmosphere under the normal stress-free condition, so that the system is mainly used for reflecting the short-term response of the gas flux to the environmental change.

The present description relates to a sensor (200) for sensing bulk viscosity of a gaseous substance, the sensor comprising: - a MEMS transducer (201) comprising a mobile element (203) suspended above a cavity (205) and at least one vent (209) allowing gas exchanges between the cavity and an external environment; and - a control circuit for controlling the MEMS transducer, configured to: a) vibrate the mobile element around its resonant frequency; b) measure a signal representative of a resonant frequency and of a resonant bandwidth of the MEMS transducer; and c) compare the signal with a reference signal and deduce therefrom information representative of the bulk viscosity of the gaseous substance present in the cavity.

The invention discloses a threaded nylon explosion-proof pressure-relief waterproof breathable connector which comprises a connector shell, a mounting ring is fixedly connected in the connector shell, the mounting ring is slidably connected with a breathable base, the breathable base is bonded with a breathable film, the breathable base is detachably connected with a gland, the breathable base is sleeved with a pressure spring, and the pressure spring is fixedly connected with the connector shell. The end portion of the ventilation base is detachably connected with an end face elastic buckle, the two ends of the compression spring are fixedly connected with the end face elastic buckle and the installation ring respectively, and the connector shell is provided with an extrusion structure. According to the invention, dual channels of normal micro ventilation of the breathable film and mechanical pressure relief driven by the spring are integrated. Under normal pressure difference, gas is exchanged through the gas-permeable membrane to keep pressure balance and prevent water and dust; when the internal pressure rises suddenly, the air pressure can push the ventilation base to compress the spring, so that the spring is separated from the O-shaped sealing ring, a larger pressure relief channel is opened up instantly, the explosion-proof response is sensitive, and the safety guarantee is more comprehensive.

The utility model discloses a ventilation device for a livestock and poultry house, and belongs to the technical field of livestock and poultry breeding. Comprising an air suction box and an air entraining box, a plurality of air suction ports and a first negative pressure fan are arranged on one side of the air suction box, an activated carbon assembly is arranged in the air suction box, and a filtering assembly is arranged between the activated carbon assembly and the air suction ports; the air inlet end of the first negative pressure fan is connected with the multiple air suction ports through a first air inlet pipe. By arranging the filter assembly in the air suction box, dust contained in air in the livestock and poultry house can be filtered, and the situation that the dust enters the activated carbon assembly and blocks holes of activated carbon, and consequently the adsorption capacity of the activated carbon is reduced is avoided; by arranging the activated carbon assembly, peculiar smell sucked into the air suction box can be absorbed, and then pollution of air in the livestock and poultry house to the external environment is effectively reduced; by arranging the air entraining box, air in the external environment can be rapidly introduced into the livestock and poultry house, and the purpose of air exchange is achieved.

The present invention discloses a negative-pressure dust-proof sleeve device, which includes an inner sleeve and an outer sleeve. The inner sleeve is sleeved inside the outer sleeve. The device further includes a dust-proof ring fixedly installed at the top end of the outer sleeve. The dust-proof ring includes an installation sleeve ring and a horn-shaped sealing ring. The installation sleeve ring is fixed to the top of the outer sleeve. The bottom of the horn-shaped sealing ring is integrally formed with the inner wall of the installation sleeve ring. The top of the horn-shaped sealing ring is sealingly connected to the radial outer wall of the inner sleeve. A transition air chamber is formed between the inner wall of the horn-shaped sealing ring and the top end face of the outer sleeve. The present invention can adjust the size according to the actual situation to transform the existing sleeve structure, with strong compatibility. The design of the transition air chamber can reduce the air pressure difference inside and outside the sleeve structure, and change the target of gas exchange caused by clearance fit from ambient gas to clean gas brought by the air pipe, thereby prolonging the service life of the machine.

The utility model relates to sewage treatment field especially, it is a kind of single tower low pressure stripping device for sewage treatment, including support frame, shell, gas outlet, sewage inlet, battens and gas outlet component etc., support frame is connected with shell, shell upside is connected with gas outlet, shell upper portion left side is connected with sewage inlet, shell middle part inboard is connected with multiple battens, support frame lower part is equipped with the gas outlet component for treating acidic component in sewage. The utility model discloses through sewage S shape along batten flows to shell lower part, while sewage will promote impeller and cleaning frame rotation to scrape the impurity on batten, so that water vapor moves upward, flows through air inlet hole and contacts sewage to treat sewage, so that it can remove acidic component when sewage flows and treat, promote cleaning frame rotation to scrape the impurity on batten, prevent air inlet hole blockage, enhance gas exchange effect, improve sewage treatment efficiency.

A system (100; 1) for analysing gas concentrations before and after a point of gas exchange (PGE; 3, 23) is disclosed. The system (100; 1) comprises a gas inlet line (101; 11, 33a) for conveying a flow of an input gas mixture towards the point of gas exchange (PGE; 3, 23), a gas outlet line (103; 13, 33b) for conveying a flow of an output gas mixture away from the point of gas exchange (PGE; 3, 23), and a gas analyser (105) that is connected to both the gas inlet line (101; 11, 33a) and the gas outline line (103; 13, 33b) and configured to sequentially receive and analyse gas samples from the gas inlet line (101; 11, 33a) and the gas outlet line (103; 13, 33b) in order to determine a presence of a specific gas in the input gas mixture and the output gas mixture.

Systems and methods for gas exchange in a patient are provided that use an external circuit to cause oxygenation perfusion in a body cavity (such as an abdomen) of the patient using an inert chemical (e.g., perfluorocarbon), independent of lungs. The external circuit includes components configured to control properties of the chemical, including temperature, flow rate, pressure, oxygenation percentage, and carbon dioxide percentage. The systems also include safety features to reduce a likelihood of injury to the patient. Each of the safety features and the properties of the chemical can be controlled by a healthcare worker, such as a physician, a nurse, or an emergency operator, for a particular patient.

The invention relates to a method for operating a stack assembly comprising at least one stack (2) and a housing (3) accommodating the at least one stack (2), the housing (3) enclosing a gas-filled volume (4) which is connected to an inlet line (6) via a gas inlet (5) and to an outlet line (8) via a gas outlet (7), the device is used for gas exchange. According to the invention, by opening a valve (10) integrated into a recirculation line (9), a gas or a gas mixture is conducted out of the volume (4) and is conducted again into the volume (4) via the recirculation line (9) and the gas inlet (5). The invention further relates to a stack arrangement (1) which is suitable for carrying out the method according to the invention.

To provide a device capable of continuously performing intestinal ventilation.SOLUTION: An intestinal ventilation device for administering oxygenated liquid into an intestine comprises: a propulsion section; a retaining section which retains the oxygenated liquid in a predetermined region of the intestine; an inlet section which supplies the oxygenated liquid into the intestine; an outlet section which discharges the oxygenated liquid from the intestine; a liquid circulation gas exchange section which supplies the oxygenated liquid to the inlet section, performs gas exchange on discharged liquid discharged from the outlet section and circulates the liquid; a propulsion drive section which performs propulsion drive of the propulsion section; and a retaining drive section which drives the retaining section. The propulsion section, the retaining section, the inlet section, and the outlet section constitute an intestinal insertion section inserted into the intestine.SELECTED DRAWING: Figure 1