134 results about "Buffer gas" patented technology

A lithium battery detection device based on BB optical pump magnetic imaging comprises a magnetic shielding cylinder and a substrate arranged in the magnetic shielding cylinder, and a laser, an optical lens system, an atomic gas chamber system, an array lens and an array photoelectric detector are sequentially arranged on the working face of the substrate from left to right; the atomic gas chamber system contains alkali metal atoms and buffer gas; a non-magnetic objective table for placing a lithium battery to be tested is arranged above the atomic gas chamber; according to the device, the array lens is adopted to split and focus a single beam of detection laser into small light spots which are respectively irradiated on different photoelectric detectors, and magnetic field information of a plurality of space point locations is detected at one time, so that the consistency and imaging quality of a subsystem are improved, and the system cost is saved.

The invention provides an air pressure regulation and control device, a cold air micro-propulsion system and a satellite, and relates to the technical field of cold air micro-propulsion. The air pressure regulation and control device comprises a high-pressure valve, a two-stage pressure reducing valve, a precise pressure regulating valve, a buffer gas cylinder and a pressure sensor; one end of the high-pressure valve is connected with the high-pressure gas cylinder, and the other end of the high-pressure valve is connected with the two-stage pressure reducing valve through a first pipeline; the precise pressure regulating valve is provided with a first connector, a second connector, a third connector and a fourth connector, the first connector is connected with the two-stage pressure reducing valve through a second pipeline, the second connector is connected with the pressure sensor through a third pipeline, the third connector is connected with the buffer gas cylinder through a fourth pipeline, and the fourth connector is connected with the thruster. Compared with the prior art, the air pressure regulation and control device has the advantages that the mode of combining two-stage pressure reduction, air capacity buffering and air pressure closed-loop precise regulation and control is adopted, stable and low-noise air can be supplied to the thruster, and therefore high-stability and low-noise thrust output is achieved.

A hybrid inductively coupled plasma mass spectrometer (ICP-MS) system is disclosed for simultaneous elemental and molecular analysis in positive and negative polarities. It includes an ICP torch that generates plasma with a buffer gas, producing both positively and negatively charged ions from a sample. Positioned between the sampler and skimmer, an insert with a defined geometry forms a reaction chamber. Various embodiments feature multiple apertures for pressure control, a rotatable disk for aperture regulation, a slider gate for pressure adjustment, a circular gate with adjustable radial apertures, and an inlet for introducing gases, reagents, dopants, or analytes. These components enable precise pressure modulation, optimizing performance for dual-polarity mass spectrometry. The system enhances analytical flexibility by facilitating controlled ion reactions, improving sensitivity and specificity for both elemental and molecular applications. This innovation expands ICP-MS functionality, supporting diverse scientific and industrial applications requiring high-precision mass analysis.

The invention relates to the field of quantum measurement, and provides a CPT magnetometer magnetic measurement signal-to-noise ratio improving method and device based on a differential EIT-EIA signal. The CPT magnetometer solves the problem that a traditional CPT magnetometer is low in magnetic measurement signal-to-noise ratio due to the influence of environment temperature noise, laser stability and atomic gas chamber buffer gas. According to the main scheme, the CPT magnetometer comprises a laser generation module, a reference correction module, a differential detection module, a non-magnetic heating module and a signal processing module. The laser generation module generates reference / measurement double beams through the laser and the polarization regulation and control assembly; the reference correction module performs polarization conversion and optical path regulation and control on the reference light; the differential detection module divides the measurement light into two paths by adopting polarization beam splitting, the first path is subjected to polarization state conversion through an interference light path after frequency modulation, the second path is converted into circularly polarized light after optical fiber transmission, the two paths of light are coupled and then enter an atomic gas chamber for interaction, and differential detection is realized through a polarization beam splitting detector; and the non-magnetic heating module accurately controls the temperature of the air chamber by using a non-contact photo-thermal conversion technology.

The invention discloses an oxygen carrier abrasion evaluation device and method. The device comprises a computer, a PLC, a weighing sensor, a differential pressure sensor, a buffer gas chamber, an infrared heating furnace, a compressed gas cylinder, a water storage bottle, a sampling pipe, a tail gas collecting pipe, a filter, a micro gas pump and a reactor. Wherein the computer, the weighing sensor, the differential pressure sensor and the infrared heating furnace are all connected with the PLC, a reactor is arranged in the infrared heating furnace, the weighing sensor is provided with the scale, the scale is provided with the buffer gas chamber, the buffer gas chamber is communicated with the reactor, and the compressed gas cylinder and the water storage cylinder are both connected with the buffer gas chamber; the micro air pump is connected with the filter which is connected with the tail gas collecting pipe. Under the conditions of a mechanical wear experiment and a thermal stress wear experiment, the wear performance of the oxygen carrier is evaluated by drawing a thermogravimetric curve and calculating the wear rate by using a thermogravimetric signal transmitted by the device, which indicates that the oxygen carrier has good chemical looping reaction wear resistance, and the method provides a scientific basis for optimizing the design and operation of a chemical looping reaction system.

The present invention improves storage efficiency by effectively using, in a simple form, the storage volume of a compressed gas storage part in which a compressed gas is stored. Provided is a compressed gas storage system (100) for storing a compressed gas which has been compressed by a compressor, said system comprising: a compressed gas storage part (300) in which a compressed gas is stored; a buffer gas storage part (310) in which a buffer gas is stored; a first cooler (306) that cools the buffer gas; a first adjustment valve (307) that is provided between the first cooler and the buffer gas storage part; a second adjustment valve (309) that is provided between a first heater and the buffer gas storage part; a second heater (312) that heats the buffer gas inside of the buffer gas storage part; and a control unit (320) that at least controls the temperatures of the first cooler, the first heater, and the second heater, and the degrees of opening of the first adjustment valve and the second adjustment valve.

The invention relates to a light-weight TPcon special solder strip annealing device which comprises a box body and a cooling water tank fixed to the surface of the box body, an upper annealing wheel, a third wheel and a driven wire passing wheel are rotationally arranged on the surface of the box body, and the driven wire passing wheel is located in an inner cavity of the cooling water tank. According to the special light-weight TPcon solder strip annealing device, a dynamic labyrinth sealing structure composed of a fluororubber sealing sleeve, an adjustable movable plate and a partition plate is arranged and combined with a gas storage tank buffer gas supply system, on the premise that a solder strip continuously penetrates through the dynamic labyrinth sealing structure, multiple zigzag gas leakage paths are formed, the gas leakage resistance is greatly increased, and the service life of the solder strip is prolonged. According to the system and the method, by matching with a micro-positive pressure environment maintained by the gas storage tank, 'on-demand supplementation 'is realized, most of nitrogen is sealed in the system for cyclic utilization, only extremely small leakage amount needs to be supplemented, and compared with a traditional continuous purging mode, more than 90% of nitrogen consumption can be saved, and the production cost is remarkably reduced.

The invention provides a low-temperature molecular beam device, which relates to the field of low-temperature physical chemistry and comprises a refrigeration assembly, a primary shielding cover and a buffer cooling structure. The refrigeration assembly comprises a first-stage cold head and a second-stage cold head; the first-stage shielding cover is provided with a first-stage shielding inner cavity; the first-stage cold head is connected with the first-stage shielding cover and is used for cooling the first-stage shielding cover; the second-stage cold head is accommodated in the first-stage shielding inner cavity; the buffer cooling structure is connected to the second-stage cold head and is accommodated in the first-stage shielding inner cavity; the buffer cooling structure is provided with a buffer cooling inner cavity, and the buffer cooling inner cavity is used for introducing buffer gas and target molecules. According to the low-temperature molecular beam device in the embodiment of the invention, the temperature of the buffer gas can be further reduced.

The invention discloses an online detection method for a gas densitometer, which relates to the technical field of gas densitometer detection and comprises the following steps of: for density data which are determined as data with inconsistent structures, combining the density data with temperature data and pressure data in a corresponding time period; identifying whether a detection time period corresponding to the density data is in a buffer air mass intervention state or not; under the condition of a buffer gas mass intervention state, constructing a detection point based on temperature data, pressure data and density data collected by a gas densimeter in real time, comparing the detection point with a representative state space constructed based on a historical stable state, and determining an attribute mismatching degree of the density data; and dividing the density data into three grades of representativeness, representativeness doubt and non-representativeness according to the determined attribute mismatch degree. According to the method, the problem that the density data distortion cannot be identified due to buffer air mass intervention is solved, and density data representativeness intelligent discrimination and differential application are realized.

The utility model relates to the technical field of gas detection, in particular to a hydrogen analyzer. The analyzer comprises an analyzer body, a gas inlet formed in the top of the analyzer body, a hydrogen treatment mechanism, a buffer gas supply mechanism and a rotating shaft I, the hydrogen treatment mechanism is arranged on the outer side of the gas inlet through threads; the buffer gas supply mechanism is arranged at the top of the hydrogen treatment mechanism; the first rotating shaft is rotationally arranged on the hydrogen treatment mechanism. According to the utility model, the hydrogen treatment mechanism is arranged, the filter plate is used for blocking and cleaning particle impurities in to-be-detected gas, and the molecular sieve in the filter box and the activated carbon in the placing box are used for absorbing other gases in the to-be-detected gas, so that the impurities can be effectively removed, and the hydrogen is ensured to smoothly enter the analyzer; therefore, the measurement accuracy is improved, the phenomenon that impurities interfere with a hydrogen detection signal and cause deviation of a measurement result is avoided, the concentration of hydrogen can be improved by absorbing other gases, and the measurement accuracy is improved.

The present invention discloses a seasonal compressed air energy storage system, comprising a compressor unit, a power mechanism, a turbine unit, a heat exchange mechanism, and an underground water-bearing or saline layer. The compressor unit and the power mechanism are detachably connected, and the power mechanism and the turbine unit are detachably connected. The underground water-bearing or saline layer is covered with a dense cover layer, and the underground water-bearing or saline layer is connected to a group of working wells extending to the ground. An air inlet pipe is provided between the compressor unit and the group of working wells, and an air inlet valve is provided on the air inlet pipe. An air outlet pipe is provided between the turbine unit and the group of working wells, and an air outlet valve is provided on the air outlet pipe. Both the air inlet pipe and the air outlet pipe are passed through the heat exchange mechanism. Also disclosed is a seasonal compressed air energy storage method, comprising the steps of: injecting buffer gas; energy storage; and energy release. This seasonal compressed air energy storage system and method have a large energy storage scale, a long storage period, low development cost, a small footprint, low environmental impact, high energy efficiency, and can be deployed across seasons.

The invention relates to a multi-detector high-capacity ion trap quality analysis system which is arranged in a negative pressure sealed cavity containing buffer gas, the negative pressure sealed cavity is provided with an ion inlet, and the system comprises a first ion screening assembly communicated with the ion inlet, the first ion screening assembly is connected with one end of an ion dispersion assembly, and the other end of the ion dispersion assembly is connected with a second ion screening assembly; the other end of the ion dispersion assembly is connected with the second ion screening assembly, and the second ion screening assembly is provided with an ion output port. The ion trap mass analyzer is divided into the first ion screening assembly, the ion dispersion assembly and the second ion screening assembly, the overall capacity of the ion trap mass analyzer is improved, the ion detection efficiency and accuracy are improved through cooperation of multiple groups of detectors and the electrode stem slit, and the detection sensitivity, the analysis speed and the flux are further improved. When the ion dispersion assembly and the second ion screening assembly work, the first ion screening assembly can continuously drive ions to be analyzed to enter.

An extreme ultraviolet light generation apparatus includes a chamber in which a target substance supplied to a plasma generation region is irradiated with laser light to generate extreme ultraviolet light, a laser device generating the laser light, a target supply unit supplying a droplet of the target substance toward the plasma generation region, a target collection unit collecting the target substance which has not been irradiated with the laser light, a first gas supply unit supplying a buffer gas into the chamber, and a processor controlling the first gas supply unit so that, in a period of the droplet being output, a first flow rate of the buffer gas to be supplied from the first gas supply unit in at least a part of a first period is smaller than a second flow rate of the buffer gas to be supplied from the first gas supply unit in a second period.

The invention relates to an atomic gas chamber and a preparation method thereof. The preparation method of the atomic gas chamber comprises the following steps: providing an atomic gas chamber glass bulb; rubidium steam is filled in the atomic gas chamber glass bulb; the atomic gas chamber glass bulb is filled with mixed gas; wherein the mixed gas comprises xenon 129, xenon 131, hydrogen and a buffer gas; the voltage division ratio of the xenon 129 to the xenon 131 is (1: 4)-(1: 9); carrying out heat preservation treatment on the atomic gas chamber glass bulb, and reacting rubidium steam with hydrogen to generate a rubidium hydride film layer; and the rubidium hydride film layer covers the inner wall of the atomic gas chamber glass bulb. According to the preparation method of the atomic gas chamber, provided by the invention, the atomic spin relaxation time of xenon 129 and xenon 131 can be prolonged, the relaxation performance of two isotopes can be balanced, the performance of the atomic gas chamber is further improved, and the requirements of application scenes such as a quantum inertia instrument on the atomic spin stability of the atomic gas chamber are met.

The application provides a gas pressure regulating device, a cold gas micro-propulsion system and a satellite, and relates to the technical field of cold gas micro-propulsion. The gas pressure regulating device comprises a high-pressure valve, a two-stage pressure reducing valve, a precision pressure regulating valve, a buffer gas cylinder and a pressure sensor. One end of the high-pressure valve is connected with a high-pressure gas cylinder, and the other end of the high-pressure valve is connected with the two-stage pressure reducing valve through a first pipeline. The precision pressure regulating valve is provided with a first interface, a second interface, a third interface and a fourth interface. The first interface is connected with the two-stage pressure reducing valve through a second pipeline, the second interface is connected with the pressure sensor through a third pipeline, the third interface is connected with the buffer gas cylinder through a fourth pipeline, and the fourth interface is connected with a thruster. Compared with the prior art, the gas pressure regulating device adopts a combination of two-stage pressure reduction, gas capacity buffering and gas pressure closed-loop precision regulation, can supply stable and low-noise gas to the thruster, and thus realizes high-stability and low-noise thrust output.

A ground support verification method for a buffer air capacity air supply strategy of an air cooling system belongs to the technical field of satellite propulsion systems, and comprises the following steps: a ground simulation system collects execution mechanism information output by a satellite; the ground simulation system collects the working time of an attitude and orbit control thruster and a pressure air supply control electromagnetic valve used by the cold air system; the ground simulation system calculates the consumption amount and the supplement amount of the working medium gas in the gas capacitor in each period through the working duration; the ground simulation system calculates the current air capacity pressure and the pressure variation; the ground simulation system performs fault simulation and fault pressure setting; the ground simulation system converts the pressure variation into a voltage value for output, and the satellite system receives the voltage value for pressure conversion and telemetering output; the ground simulation system calculates star attitude information through a control moment generated by air injection, generates sensor information through the star attitude information, and sends the sensor information to a satellite system to form whole data interaction and verification.

The utility model discloses an oxygen generator capable of being automatically started and stopped. The oxygen generator comprises an air compressor, an efficient degreaser, a refrigerated dryer, a filter, a buffer gas storage tank, oxygen generation equipment, a dust fine filter, an oxygen buffer tank and a gas storage tank which are connected in sequence, the oxygen generating device is characterized in that a sensing piece for sensing the pressure in the air storage tank and a controller connected with the sensing piece and the oxygen generating device are mounted on the air storage tank; the air storage tank is composed of a plurality of tank bodies and pneumatic separation seats installed among the tank bodies. According to the utility model, the pressure of the gas in the gas storage tank is sensed in real time by using the sensing piece, a signal is sent to the controller, and the controller controls the oxygen production equipment to work and stop according to the set pressure, so that the automatic production is realized, the production efficiency is improved, and the labor intensity of workers is reduced; the tank bodies are separated or communicated through the pneumatic separation base, the space for storing gas in the gas storage tank is adjusted, meanwhile, a plurality of oxygen production devices can be connected at the same time to be used, and the occupied area of the devices is reduced.

This invention discloses a miniature Faraday atom filter based on Faraday anomalous dispersion and its implementation method, comprising: an alkali metal atom gas cell with antireflection films coated on both sides of the light-passing holes corresponding to the wavelengths of the alkali metal atom absorption lines, and filled with a buffer gas; a permanent magnet or coil surrounding the alkali metal atom gas cell to generate a uniform strong magnetic field parallel to the direction of light propagation; first and second polarizers located on both sides of the alkali metal atom gas cell and facing it directly; the polarization directions of the two polarizers are perpendicular to each other; and a temperature control system that heats and maintains the temperature of the alkali metal atom gas cell, and detects and controls the temperature. This invention reduces the size of the Faraday atom filter to 1 / 1000 of the mainstream size, improves mechanical stability, expands its applicability, and is expected to achieve plug-and-play functionality, greatly broadening the application of Faraday atom filters in fields such as space communication, laser technology, quantum information, and metrology.

The invention relates to a supercavitation navigation body water tunnel test high-temperature air supply system and an operation method, the supercavitation navigation body water tunnel test high-temperature air supply system comprises an air source supply processing device, the output end of the air source supply processing device is connected in series with a first-stage pressure reducing valve and a second-stage pressure reducing valve through a pipeline, the output end of the second-stage pressure reducing valve is connected with a buffer air cylinder, and the top of the buffer air cylinder is provided with a safety valve; the output end of the buffer gas cylinder is divided into two paths, one path is connected with an electric heater through a mass flow controller and a first one-way valve, and the other path is communicated with a three-way pneumatic electromagnetic valve through a gas tank pressure reducing valve; the output end of the electric heater is further communicated with a three-way pneumatic electromagnetic valve through a check valve, the three-way pneumatic electromagnetic valve is divided into two branches again, one branch is communicated with an outlet water tank through a second one-way valve, and the other branch is communicated with a test water tunnel outlet pipeline through a third one-way valve. The water tunnel test of air source state adjustment can be completed in a high temperature range of 0-600 DEG C, and the use requirement is met.

The utility model provides an air cylinder and a control system, and relates to the technical field of driving. The air cylinder comprises an air cylinder body, an air cylinder cover assembly and a piston assembly. The air cylinder cover assembly is arranged at the end of the air cylinder body, the first end of the piston assembly is movably arranged in the air cylinder body, and the second end of the piston assembly penetrates through the air cylinder cover assembly. Buffering air holes are formed in the piston assembly and the air cylinder cover assembly, the buffering air holes are configured to input gas into the air cylinder body or release gas in the air cylinder body, and the piston assembly moves based on the internal pressure of the air cylinder body. The control system comprises controlled equipment and an air cylinder. The cylinder is in contactable connection with controlled equipment; the second end of the piston assembly in the air cylinder controls the controlled device based on movement. According to the air cylinder, the buffering air holes serve as air inlet and outlet channels, the movement condition of the piston assembly in the air cylinder body is buffered, the buffering stability and effectiveness are effectively improved, and therefore the vibration reduction effect of the air cylinder is optimized.

The application discloses a phase change pneumatic working device and a working method, which comprise a heat supply mixed phase changer, a first pipeline, a second pipeline, a parallel pipeline composed of an extrusion gas source supply branch and a phase change medium supply branch, one end of the first pipeline is communicated with the parallel pipeline, the other end of the first pipeline is communicated with the heat supply mixed phase changer, the heat supply mixed phase changer is provided with an expansion working pipeline away from the one end of the first pipeline, one end of the second pipeline is communicated with the parallel pipeline, and the other end of the second pipeline is an air inlet. The extrusion gas source supply branch of the application can inject air into the mixed chamber of the heat supply mixed phase changer at the beginning of work, discharge the initial water in the mixed chamber, form a larger buffer gas chamber in the chamber, facilitate the subsequent blowing process, and effectively help the initial air to form an initial air cushion in the water tank, so that the blowing efficiency of the phase change power device in the early stage is effectively improved.

The application provides a full-autonomous pressure dynamic balance adjusting method of a double-branch cold gas propulsion system, and is suitable for a spacecraft provided with a pressure sensor cold gas propulsion system. At present, there is no system method for the validity of low-pressure pressure transmission data and the autonomous adjusting control of buffer gas container pressure in a traditional satellite cold gas propulsion system. In order to solve the above problems, the patent applicant designs a full-autonomous pressure dynamic balance adjusting algorithm of a double-branch cold gas propulsion system. The method comprises two modules: the validity of low-pressure pressure transmission data and the autonomous adjusting control of gas container pressure. The second module performs pressure adjusting calculation of double-branch buffer gas containers on the basis of the first module, and opens the pressure control electromagnetic valves of each branch to perform air supplementing operation when the gas container pressure decreases. The pressure following control strategy is adopted to realize the pressure dynamic balance control of the double-branch symmetrical discharge system, and the double-branch buffer gas container pressure autonomous adjusting and air supplementing problem of the satellite cold gas propulsion system is well solved by adopting the method.

The application discloses a kind of motor home refrigeration systems, including air supply system, intelligent adjustment vortex tube component, intelligent temperature control module and noise reduction system.Air supply system contains multistage compression air compressor, energy recovery device and buffer gas storage tank, energy recovery device recovers brake energy by pneumatic turbine, heat exchanger utilizes engine exhaust waste heat, and is cooperated with multistage compression air compressor to improve energy utilization efficiency;In intelligent adjustment vortex tube component, driving part is driven to open and close adjusting part by transmission structure, and realizes dynamic adjustment of air outlet;Temperature sensor, MCU controller with built-in PID fuzzy control algorithm are used in intelligent temperature control module, automatically adjust component action, break through the limitation of manual adjustment, realize high-precision constant temperature;Noise reduction system's noise reduction piece and spiral guide vane can reduce operating noise.The preferred structure further improves transmission stability, adjustment accuracy, energy saving and noise reduction effect, and enhances the overall performance of system.

The utility model discloses a compression-resistant draw-bar box, which relates to the technical field of draw-bar boxes, and comprises a main box frame and an auxiliary box frame hinged to one side of the main box frame, the main box frame and the auxiliary box frame form a draw-bar box main body, the main box frame and the auxiliary box frame are both composed of compression-resistant components, and the compression-resistant components are used for improving the compression resistance of the main box frame and the auxiliary box frame. A plurality of separation assemblies are arranged in the main box frame and the auxiliary box frame and used for separating storage spaces in the main box frame and the auxiliary box frame, and each compression-resistant assembly sequentially comprises an outer layer, a buffer layer and an inner layer from inside to outside. Preliminary damping is achieved through the outer layer, impact force and vibration caused by impact of external force on the outer layer are further absorbed in combination with the buffer layer, and the buffer effect is enhanced through the buffer gas filled in the elastic supporting columns, so that the compression resistance of the main box frame is effectively improved, the main box frame can bear larger external force extrusion, and the service life of the main box frame is prolonged. And the safety of articles in the main box frame is protected.

The utility model relates to a double-sided buffer material box, which comprises a box body, a lifting assembly and an air bag cushion, wherein the box body is placed on an operation table with a top plate of the box body facing upwards, two sides of a chip substrate are inserted into bearing grooves, buffer gas is filled into the air bag cushion through an inflation inlet, a worker turns over the box body to enable a bottom plate to face upwards, and the chip substrate vibrates due to turning over, so that the chip substrate is prevented from falling off. The chip substrate located at the bottom end collides with the air bag cushion, the air bag cushion effectively absorbs the impact force of the chip substrate, vibration of the chip substrate is relieved, the air bag cushion can rapidly restore to the original shape after being impacted, finally the box body is carried, and by arranging the air bag cushion, the air bag cushion cannot be permanently deformed due to long-term load; and the service life of the double-sided buffer material box is prolonged, and the effectiveness of protecting the chip substrate is improved.

The invention relates to the field of high-voltage cable metal aluminum sheath processing, in particular to a gas recycling device and method for argon arc welding of a high-voltage cable. The gas recycling device for argon arc welding of the high-voltage cable comprises an explosion-proof type recycling gas pump, a first sealing pipeline and a second sealing pipeline, an inlet of the high-precision gas filtering device is connected with an outlet of the explosion-proof recovery gas pump, and the high-precision gas filtering device is used for removing welding slag and oil dirt impurities in the recovered gas; an inlet of the buffer gas storage tank is connected with an outlet of the high-precision gas filtering device through a second sealing pipeline, and the buffer gas storage tank is used for storing the purified gas. By innovatively designing the helium recovery and circulation system, efficient recovery, purification, storage and reuse of residual helium are achieved, helium consumption and production cost are remarkably reduced, production interruption caused by frequent bottle replacement is reduced, and meanwhile the stability of welding quality is guaranteed.

A method of performing negative electron activation dissociation (negative EAD) in mass spectrometry includes introducing a plurality of negatively charged analyte ions into an ion trap positioned in a chamber and trapping said negatively charged analyte ions in a reaction region of said ion trap, introducing a buffer gas into the chamber, using an electron source positioned in the chamber and external to the ion trap to generate electrons, and accelerating the electrons to form an electron beam and introducing the electron beam into the ion trap such that the accelerated electrons are capable of ionizing at least a portion of molecules of the buffer gas to generate a plurality of positively charged ions. The accelerated electrons interact with at least a portion of the analyte ions trapped in said reaction region to cause negative EAD thereof, thereby generating a plurality of fragment product ions.

The invention relates to the technical field of concrete testing, and discloses a concrete gas permeability testing system which comprises a placement base, a fixed seat arranged on one side of one end of the top of the placement base, and a testing container shell arranged on the top of the fixed seat, the limiting ring seats are arranged on the two sides of the testing container shell, and one end of each limiting ring seat extends to an inner cavity of the testing container shell. According to the concrete gas permeability testing system, the buffer gas tank is used for providing pressure intensity and detecting the gas pressure of the test piece penetrating through the test piece, so that the gas permeability rule of the large concrete centimeter-level test piece under different confining pressures and gas pressures is accurately obtained, and meanwhile, the operation steps and time cost of an experiment are greatly saved; therefore, the working efficiency is improved, and more test tasks can be completed in a shorter time in practical application, so that the progress of an engineering project is accelerated.

The utility model discloses a negative pressure accurate control device for an electric cupping device. The negative pressure accurate control device is composed of a buffer gas tank, a negative pressure sensor, a control mainboard, a gas pipe, a gas pump, a miniature pressure release valve, a quick connector and the like. The buffer gas tank, the gas pipe, the miniature pressure release valve and the gas pump are connected through the quick connector, the quick connector is a multi-gas-path quick connector, one end of the miniature pressure release valve is connected with the quick connector, one end of the buffer gas tank is connected with the negative pressure sensor, the other end of the buffer gas tank is connected with the quick connector, and the other two ends of the quick connector are connected with the gas pump and the cupping device respectively; the negative pressure can be accurately and automatically controlled, and the negative pressure can be adjusted at any time in the using process; meanwhile, programming functions of fluctuation voltage, pulse voltage and the like are realized; automatic pressure maintaining, sensitive pressure control and programmable voltage transformation can be realized; operation is convenient, and automatic operation can be achieved only through simple arrangement of a control panel.