46results about How to "Avoid control" patented technology

The invention relates to a voice wake-up method and device, electronic equipment, a storage medium and a vehicle. The method comprises the following steps: collecting a target voice signal; when it is detected that the target voice signal comprises the wake-up word and the generation position of the target voice signal is recognized to be in the cabin of the vehicle based on a position model, the current gear of the vehicle is determined; and awakening a voice assistant in the cabin under the condition that the target voice signal is determined to be the voice signal in the cabin based on the current gear. According to the method, the personnel outside the cabin of the vehicle can be prevented from waking up the voice assistant in the cabin, and the safety of the vehicle is improved.

The invention relates to an optimal fault-tolerant control method and system for coastal tugboat robust path tracking. The method comprises the steps of establishing three-degree-of-freedom tugboat kinematics and dynamics equations, constructing an error system which considers external ocean disturbance and internal propeller faults at the same time according to information of a reference trajectory, constructing a proper discount performance function in combination with the error system, and calculating the discount performance of the tugboat according to the discount performance function. Wherein the discount performance function comprises estimation for external ocean disturbance and internal thruster faults, and an optimal solution of the discount performance function is obtained through de-iterative optimization of an action home-approval home neural network based on an adaptive dynamic programming method. According to the method, tugboat path tracking control under the multi-constraint condition can be overcome, and the parameter setting process is simplified.

The present invention discloses a textile fabric detection device, comprising a base, two side plates are symmetrically fixedly arranged on the base, a coiling roller is rotatably arranged between the two side plates, the coiling roller is rotatably arranged on the two side plates through a rotating rod, a motor is fixedly arranged on one side plate, one end of the rotating rod rotates through the side wall of the side plate and is fixedly connected to the output end of the motor, a cloth fixing mechanism is provided on the coiling roller, a flat table is fixedly arranged on the base, a detector is fixedly arranged on the upper wall of one end of the flat table close to the coiling roller, a slide plate is slidably arranged on the side wall of the flat table, the slide plate is slidably arranged on the side wall of the flat table through a sliding rod, and the cleaning plate is fixedly arranged on the side wall of the slide plate close to the flat table through a connecting mechanism. The present invention can smooth and clean the textile fabric before the textile fabric is detected, so as to avoid fabric wrinkles or adhesion of debris affecting the detection effect.

The utility model discloses a self-locking structure of a power converter, and relates to the technical field of power converters, the self-locking structure of the power converter comprises a fixed shell, the surface of the fixed shell is provided with a groove, the groove is internally provided with a rotary plug, the surface of the rotary plug is fixedly connected with a mounting shaft, and the mounting shaft is fixedly connected with the rotary plug. The surface of the mounting shaft is rotationally connected with the interior of the fixing shell, a sliding plate is slidably connected with the interior of the fixing shell, a limiting rod is fixedly connected with the surface of the sliding plate, a positioning groove is formed in the surface of the mounting shaft, a threaded rod is in threaded connection with the interior of the fixing shell, and the threaded rod penetrates through the exterior of the fixing shell. According to the self-locking structure of the power converter, locking and rotating of the rotary plug are completed by rotating the threaded rod, the situation that the rotary plug is controlled by arranging a complex structure in comparison cases is avoided, and the self-locking structure is convenient for workers to operate and convenient for people to use.

The invention discloses a control method, a control device and an air conditioner. The air conditioner comprises an air outlet panel, the air outlet panel comprises a front air outlet and a lower air outlet, the front air outlet is used for supplying air forwards and is provided with a front air outlet air deflector assembly, and the lower air outlet is opened downwards and is provided with a lower air outlet air deflector assembly; the front air outlet air deflector assembly and the lower air outlet air deflector assembly operate independently. The front air outlet air deflector assembly comprises an outer side air deflector assembly and an inner side air deflector assembly which operate independently; the control method comprises the steps that the outer side air guide plate assembly, the inner side air guide plate assembly and the lower air outlet air guide plate assembly are controlled, so that a multifunctional air supply mode is achieved through cooperation of the front air outlet and the lower air outlet. According to the scheme, the problem that a user feels cold in legs and feet due to the fact that downward air supply is difficult and particularly hot air conduction is difficult can be solved, the conduction angle of hot air can be controlled, the selectivity of the user is more, and therefore the carpet type heating effect can be achieved.

Embodiments of the present application provide a method and device for accompanying flight control of a UAV, a manned aircraft and a storage medium. The method comprises: determining accompanying flight positions of at least one UAV in response to a position locking instruction of the at least one UAV; receiving a flight control signal for the manned aircraft, converting the flight control signal to obtain a control signal for the UAV; performing corresponding flight control on the manned aircraft in response to the flight control signal, and performing corresponding control on the UAV in response to the control signal, so that each UAV located at each accompanying flight position performs accompanying flight control on the manned aircraft. Based on the conversion between the flight control signal of the manned aircraft and the control signal of the UAV, the manned aircraft and the UAV have corresponding instantaneous forward speed, corresponding instantaneous translation speed and corresponding instantaneous vertical speed, so that the UAV can keep synchronous relative static with the manned aircraft, and the accompanying flight control of the UAV on the manned aircraft is realized.

The utility model relates to the field of switch circuits, in particular to a high-power wireless switch circuit, which comprises a wireless transmitting panel and a switch control unit, a main switch module and a built-in power supply are arranged in the wireless transmitting panel, the main switch module is electrically connected with the built-in power supply, and the switch control unit is electrically connected with the main switch module. The switch control unit comprises a high-voltage rectification input module, a power supply control module, a transformer T1, a low-voltage filtering module, a receiving module and a relay control module; the main switch module is wirelessly connected with the receiving module through the wireless transmitting panel; the main switch module transmits a control signal to the receiving module through the wireless transmitting panel; the high-voltage rectification input module and the power supply control module provide a 5V1A power supply for a secondary side through the transformer T1, and a receiving signal controls the on-off of the relay control module through a control signal, thereby achieving the wireless on-off control of a high-power electric appliance, reducing the switching control difficulty, and fully protecting the personal safety of a worker.

The present invention relates to the technical field of smart street lamps, and specifically discloses an energy-saving smart street lamp management method and system, the method comprising: determining all re-divided roads based on historical pedestrian flow data of each straight road section in a management area and control circuit grouping information of all smart street lamps; determining smart street lamp grouping information based on geographical distribution data of all smart street lamps and all re-divided roads; determining all pedestrian flow time periods of each re-divided road within a unit time period based on historical pedestrian flow data of each re-divided road section, and determining the average pedestrian flow data of each pedestrian flow time period of each re-divided road section within a unit time period; based on the average pedestrian flow data of each pedestrian flow time period of each re-divided road section within a unit time period and the smart street lamp grouping information, grouping and setting the lighting power of all smart street lamps to obtain smart street lamp energy-saving management results; for saving energy consumption of smart street lamps in a large management area.

The present invention proposes an inverter bridge short-circuit protection device in a medium-frequency power supply device, comprising: a monitoring module, an execution module and a prompting module; the input end of the monitoring module is connected to the output end of the three-phase rectifier bridge arm system, and the monitoring module is used to detect whether the input voltage of the medium-frequency inverter bridge is damaged and short-circuited; the execution module comprises: a first controllable switch unit, a second controllable switch unit and an inverter thyristor triggering module, the control end of the first controllable switch unit is connected to the output end of the monitoring module, and the second controllable switch unit has a first control switch and a first execution switch; the prompting module is connected in parallel with the first control switch, and the prompting module is used to prompt that the first control switch has been connected to the first power supply voltage. The inverter bridge short-circuit protection device in the medium-frequency power supply device solves the problem that the thyristor in the medium-frequency inverter bridge in the prior art has no secondary protection.

The utility model provides a servo motor control device, which comprises an air switch QF1, an air switch QF2, a server, a servo motor, a programmable logic controller (PLC), a forward rotation button SB1, a reverse rotation button SB2, a stop button SB3, a forward limit proximity switch SQ1, a reverse limit proximity switch SQ2 and a rectifier bridge, the PLC is respectively connected with the forward rotation button SB1, the reverse rotation button SB2, the stop button SB3, the forward limit proximity switch SQ1, the reverse limit proximity switch SQ2, the rectifier bridge and the server, the rectifier bridge is connected with the air switch QF1, the PLC and the server, the air switch QF2 is connected with the server, and the server is connected with the servo motor. The servo motor control device provided by the utility model can realize accurate control of the servo motor, thereby realizing stable operation of equipment.

The utility model discloses a positive and negative pressure integrated powder particle vacuum sending device which comprises a pressurization assembly, a negative pressure assembly, a dust removal assembly and a vacuum sending tank assembly, the pressurization assembly is connected with the bottom of the vacuum sending tank assembly, the dust removal assembly is arranged at the top of the vacuum sending tank assembly, and the negative pressure assembly is communicated with the vacuum sending tank assembly through the dust removal assembly. The positive and negative pressure conveying device has the advantages of being high in working efficiency, capable of preventing dust diffusion, clean in conveying environment, capable of preventing pollution, energy-saving, efficient, capable of achieving efficient conveying, accurate in control, wide in application range and capable of achieving positive and negative pressure conveying.

The present invention relates to a control system, method and program based on virtual code, control device and control signal generating means. According to an embodiment of the present invention, the control method based on control signal including virtual code comprises: receiving control signal, a control module receives control signal generated at a specific time point from control signal generating means, wherein the control signal includes a specific virtual code, wherein the virtual code is generated by combining multiple detail codes according to a specific rule; the control module extracts multiple detail codes included in the virtual code; and searching command, the control module searches for a storage location including a specific command based on multiple detail codes, wherein the virtual code is generated differently according to the command at the same time point, and is generated differently per unit count, wherein the control module is characterized in that it is built-in or installed in a control device, and if a virtual code generated normally per unit count is received, a search start point and a search path are determined based on the multiple detail codes, and the storage location is searched, wherein the per unit count is set to a specific time interval and changes as the time interval passes.

The application discloses a transmission knock noise suppression method and device of a hybrid power system. The method comprises the following steps: obtaining an engine torque of an engine in the hybrid power system; determining a current operating condition of the hybrid power system under the engine torque; determining whether the current operating condition belongs to a predetermined operating condition to obtain an operating condition determination result; in the case that the operating condition determination result is that the current operating condition belongs to the predetermined operating condition, determining a rotational speed difference of a clutch; and suppressing the knock noise of the transmission by controlling the rotational speed difference of the clutch within a predetermined range. The application solves the technical problem that the knock noise of the transmission caused by the large torsional vibration transmitted from the engine to the transmission cannot be effectively suppressed in the prior art.

The present invention relates to the technical field of photovoltaic brackets. The present invention discloses a multi-angle adjustable flexible photovoltaic bracket and a method of use, comprising a base, a support frame is provided on the base, the bottom of the support frame is fixedly connected to the top of the base, a driving assembly is provided on the support frame, a photovoltaic panel is provided on the driving assembly, a locking assembly is provided on each side of the photovoltaic panel, the two locking assemblies are symmetrically arranged, a synchronizing device is provided between the two locking assemblies and is located on the driving assembly, a cleaning assembly is provided on the synchronizing device, and the synchronizing device includes a triggering assembly and a matching assembly. The present invention works through the driving assembly and the synchronizing device, and can automatically lock the photovoltaic panel after the panel is deflected, and can also automatically clean the surface of the photovoltaic panel, so that the convenience and power generation effect are greatly improved.

The invention provides a three-phase three-level four-leg inverter control method and system, and relates to the technical field of inverter control, and the method comprises the steps: obtaining the values of a load voltage, a load current and a reference load voltage in a vector coordinate system, and calculating a voltage error; calculating the vector values of the voltage error and the load current through a dead-beat control algorithm to obtain a first d-axis component and a first q-axis component of the reference output current in a dq coordinate system; acquiring a second d-axis component and a second q-axis component of the output current; calculating the difference between the first and second d-axis components and the first and second q-axis components to obtain d-axis and q-axis current errors; and calculating the d-axis current error, the q-axis current error, the second d-axis component, the second q-axis component and the third d-axis component and the third q-axis component of the load voltage through a sliding mode control algorithm, and inputting the result into an SPWM modulation module to control the inverter. A voltage outer loop is controlled through a dead-beat control algorithm, a current inner loop is controlled through a sliding mode control algorithm, and the complexity of the control process can be reduced.

The utility model discloses a plastic raw material color mixing device, and relates to the technical field of plastic mixing and stirring. The plastic raw material color mixing device comprises a stirring tank main body, the side surface of the stirring tank main body is fixedly connected with a control cabinet, the upper surface of the stirring tank main body is provided with an upper cover, the top of the upper cover is provided with a manual-electric double-control feeding device, the manual-electric double-control feeding device comprises a feeding pipe, and the feeding pipe is fixedly connected to the outer surface of the upper cover; a rectangular plate is fixedly connected to the outer surface of the feeding pipe, a second motor is connected to the upper surface of the rectangular plate through bolts, the feeding valve is adjusted through a control system starting or stopping instruction in the second motor, and due to the fact that the feeding valve is used in cooperation with a manual control feeding valve, the problem that existing equipment is low in efficiency is solved; when electric control fails, manual control can be used in time, waste of materials in the stirring tank due to faults of the electric control is avoided, and normal work of the stirring tank is achieved.

The invention discloses a magnetic suspension device, comprising a float, a magnetic base and a controller; the magnetic base comprises a chassis, two or three excitation coils, a permanent magnet array and a float position monitoring unit; the chassis is a mounting surface for the excitation coil and the permanent magnet array; the float position monitoring unit is arranged at the center point of the chassis for real-time detection of the current position of the float on the suspension plane and transmits it to the controller; the controller compares the current position value with the target position value, generates a position deviation signal, combines the force analysis and the calculation result of the electromagnetic force between the excitation coil and the float, changes the current magnitude and direction in all the excitation coils, so that the resultant force F of all the excitation coils on the float is P The float can be pulled to the target position value. The present invention breaks through the limitation that a set of two coils in pairs can only realize the control of the degree of freedom in a certain direction, can save space and materials, and is conducive to the miniaturization of the magnetic suspension device.

Embodiments of the present application disclose a method for sending a sounding reference signal (SRS) and an apparatus therefor, which may be applied to a 5G new radio (NR) system. The method comprises: sending SRS configuration information for obtaining uplink channel state information (CSI) to a terminal device, the SRS configuration information comprising one or more SRS resource sets, the one or more SRS resource sets being associated with one or more transmission and reception points (TRPs) for uplink PUSCH transmission, and each SRS resource set comprising at least one SRS resource; and dynamically adjusting the resource configuration of the SRS resource set according to target information. By implementing the embodiments of the present application, changes in terminal capability and channel / interference can be better adapted to by dynamically adjusting an SRS resource in a SRS resource set for obtaining uplink CSI, RRC reconfiguration is avoided, system efficiency is improved, and system signaling overhead is reduced.

The utility model belongs to the field of liquid preparation containers, and particularly relates to a liquid preparation preparation tank which comprises a tank body, the top of the tank body is fixedly communicated with a liquid inlet pipe, the top of the liquid inlet pipe is fixedly communicated with a storage box, and the top of the storage box is fixedly communicated with a pressure tank; by arranging the quantifying mechanism, under the action of the quantifying mechanism, the dosage of chemicals added into the tank body can be controlled, meanwhile, when the chemicals are added, the chemicals remaining in the inner wall can be fully added, and the situation that the chemicals remaining in the inner wall affect next-time use is avoided; therefore, the situation that after the residual preparation liquid enters different liquid preparations, the later prepared liquid preparations contain the ingredients of the first prepared liquid preparations is avoided, and the purposes that a user can conveniently control the amount of the medicament when adding the medicament and meanwhile the medicament can fully enter the tank body are achieved.

The invention provides an intelligent operation locking system and method for an AC / DC operation power supply, and the system comprises an intelligent locking device which is used for controlling the connection / disconnection of the AC / DC operation power supply according to an operation control signal so as to achieve the remote operation control, and detecting the connection / disconnection state of the AC / DC operation power supply. Therefore, an operation state signal is output and fed back to the remote control locking terminal; the intelligent approval system is used for displaying the operation result signal in an SOE form, and issuing a first operation instruction to the remote control locking terminal after password authorization; the EUT interlocking platform is used for issuing a second operation instruction to the remote control locking terminal according to the cabinet door position signal; and the remote control locking terminal is used for issuing a corresponding operation control signal to the intelligent locking device according to the operation instruction. According to the invention, remote and on-site operation of the operation power supply is realized through the intelligent locking system, and the effects of improving the through-current capability, improving the safety level, guaranteeing the personal safety and realizing five-prevention intelligent interlocking are achieved.

The present invention discloses a proofing channel conveying device, comprising at least one conveying assembly; the conveying assembly comprises a chain conveying mechanism and a transition mechanism. The chain conveying mechanism comprises a first motor, a chain connected to the first motor by driving, and a first pushing mechanism installed on the chain, the first pushing mechanism is used to push a mobile support loaded with dough to move along the conveying direction of the chain. The transition mechanism comprises a second motor, a transmission gear connected to the second motor by driving, a rack connected to the transmission gear by driving, a guide seat for installing and supporting the rack, and a second pushing mechanism installed on the rack and used to push a mobile support loaded with dough to move along the conveying direction of the chain, the length direction of the rack is consistent with the moving direction of the first pushing mechanism; the second motor can drive the rack to move along the length direction of the rack; the rack is used to support and convey the mobile support loaded with dough. It is not only easy to manufacture, but also reduces the manufacturing cost.

The invention provides a brain tissue retraction and expansion device in a variable-depth craniocerebral operation based on a release technology, which comprises a rotating plate, a fixed base plate, a mounting nut, an expansion plate and a fixed branched chain, the expansion plate is mounted on the mounting nut, the expansion plate forms a circular channel, an external thread of the mounting nut is matched with an internal thread of the fixed base plate, and the fixed branched chain is fixed on the rotating plate. The rotating plate is installed on the groove of the fixed base plate through a buckle, and a protruding edge is arranged in the rotating plate and matched with the groove of the fixed base plate; by rotating the rotating plates with different angles or radians, the elastic expansion movement of the expansion plates with different depths inserted into the brain is dragged and driven, so that the brain tissue in the brain is retracted, the healthy brain tissue is effectively prevented from being injured by an operation during a craniocerebral operation, the intentional tissue in the brain is effectively controlled, and the brain tissue in the brain is effectively prevented from being damaged by the operation. Therefore, the precise craniocerebral operation is realized, the efficiency of the craniocerebral operation is greatly improved, the operation injury to a patient is effectively reduced, and meanwhile, the workload of medical workers during the operation is reduced.

The invention discloses an intelligent massager control method, an intelligent massager, equipment and a storage medium, and relates to the technical field of massage control, feedback physiological data of the intelligent massager is acquired, and feedback feature data is determined according to the feedback physiological data; and determining a fatigue level of the user according to the feedback feature data, and determining massage control parameters according to the fatigue level, so as to control the intelligent massager based on the massage control parameters. According to the invention, the control intelligence of the massager is improved.

The utility model discloses a motor structure capable of achieving speed reduction and reversing of a windscreen wiper system, and relates to the technical field of windscreen wipers. The problem that in the prior art, the flanging noise of a windscreen wiper is large is solved. Comprising a windscreen wiper and a driving mechanism, the driving mechanism comprises a motor and a turbine which are in transmission connection, the motor and a vehicle-mounted storage battery form a windscreen wiper loop, the turbine is provided with a reset plate, the reset plate is provided with at least one notch, and a resistor is connected in series in the windscreen wiper loop and connected with the reset plate in parallel through a wire. The connecting ends of the wire and the reset plate are a first contact and a second contact, when the windscreen wiper is located at the initial position and the high position, the first contact is located at the notch and disconnected with the reset plate, and when the windscreen wiper is located between the initial position and the high position, the first contact makes contact with the reset plate, and the second contact makes contact with the reset plate. The motor structure capable of achieving speed reduction and reversing of the windscreen wiper system is used for an automobile windscreen wiper, the cost can be low, noise generated by rotating and flanging in the working process of the windscreen wiper can be reduced, and the comfort of a driver and passengers is improved.

The inverter comprises a shell, a PCB, an upper cover and a power module, an electromagnetic shielding cover fixed on the upper surface of the power module is arranged in the shell, the upper cover is installed on the electromagnetic shielding cover and forms an isolation cavity with the electromagnetic shielding cover in an enclosing mode, and the PCB is arranged in the isolation cavity; the electromagnetic shielding cover comprises a substrate, one side of the substrate is provided with a plurality of first protruding parts for bearing the PCBs, and second protruding parts protruding towards the same side of the substrate with the first protruding parts are arranged between the adjacent first protruding parts. A group of long edges of the substrate are bent to form retaining walls, the first protruding parts and the second protruding parts are arranged along one of the retaining walls, and each second protruding part is partially located on the retaining wall. According to the inverter of the utility model, the cooperation of the electromagnetic shielding cover and the upper cover is realized, and the formed isolation cavity shields the PCB, so that the electromagnetic field generated by the power module of the inverter is prevented from interfering the control of the PCB; the second protruding part reinforces the weak part, so that the relatively thin substrate keeps relatively high strength, and the thickness and the weight of the substrate are reduced.

The utility model relates to the technical field of punching machine blanking, and provides a punching machine blanking sorting device which comprises a bottom plate and a movable baffle plate, the top end of the bottom plate is connected with a punching machine main body, one side of the punching machine main body is provided with a discharge port, one side of the punching machine main body is connected with a blanking hopper matched with the discharge port, the blanking hopper is provided with an auxiliary through groove, and the movable baffle plate is arranged on the bottom plate. The inner side wall of the discharging hopper is rotationally connected with two matched material blocking plates, two through holes are formed in the discharging hopper, the interiors of the two through holes are rotationally connected with internal threaded parts, one sides of the internal threaded parts are provided with first chain wheels, the interiors of the internal threaded parts are in threaded connection with threaded rods, one ends of the threaded rods are rotationally connected with pushing rods, and the pushing rods are rotationally connected with the discharging hopper. One end of the push rod is rotationally connected to the material blocking plate, an L-shaped sliding groove is formed in the bottom end of the material blocking plate, one end of the movable baffle is connected with two connecting rods, and one end of each connecting rod is connected with a sliding rod matched with the L-shaped sliding groove, so that the situation that equipment is controlled by hands is avoided, and the purpose of improving the safety of the equipment is achieved.

An optical device (1) for controlling light from an external light source (2), comprising: at least a first and a second waveguide (3, 4) for guiding a light beam emitted from the external light source (2); and at least a first beam shaping structure (5) having a first light emitting area (6) for emitting the light beam, and a second beam shaping structure (7) having a second light emitting area (6) for emitting the light beam, wherein the first waveguide (3) guides the light beam emitted from the external light source (2) to the first beam shaping structure (5), and the second waveguide (4) guides the light beam emitted from the external light source (2) to the second beam shaping structure (7); wherein the first and second beam shaping structures (5, 7) are both configured such that the uniformity of the radiation density profile of the light beam emitted from the corresponding light emitting area (6, 8) of the corresponding beam shaping structure (5, 7) is higher than the uniformity of the radiation density profile of the light beam guided by the corresponding waveguide (3, 4) to the corresponding beam shaping structure (5, 7). A backlight unit (22) comprising such an optical device (1); and an optical system, in particular a holographic display, comprising such a backlight unit (22) and a spatial light modulator (17).

The present application provides a method, system and storage medium for pre-establishing a dedicated bearer. When a user accesses or completes MCPTT service authorization through a client, it is determined whether the user has the authority to pre-establish a dedicated bearer based on the user's user information and / or system configuration information. When it is determined that the user has the authority to pre-establish a dedicated bearer, a pre-established bearer request is initiated to the client, and a pre-established bearer request response message sent by the client is received, the response message carries the user's media information, and a dedicated bearer is pre-established for the user based on the media information. When the pre-establishment of the dedicated bearer is successful, a pre-established bearer confirmation message is sent to the client, and the confirmation message carries the media information on the network side, so that the client can use the pre-established dedicated bearer to implement the MCPTT service. This solution controls the pre-establishment of the dedicated bearer through the server, avoids the control of the pre-established dedicated bearer by the client, and improves the flexibility of the control of the dedicated bearer.

This invention discloses a nitrogen supply system and its control method, as well as glass manufacturing equipment, relating to the field of glass manufacturing technology. The nitrogen supply system includes a main gas supply module and an emergency gas supply module. The emergency gas supply module includes a gas supply regulating device, which comprises a first regulating valve and a second regulating valve connected in parallel. The first regulating valve is activated when the gas supply pressure of the main gas supply module is lower than a critical threshold, so as to replenish the gas flow of the production line module to a safe threshold. The second regulating valve is activated when the gas flow of the production line module increases to the safe threshold, so as to replenish and maintain the gas flow of the production line module to a rated threshold. The response speed of the first regulating valve is superior to that of the second regulating valve. The technical solution provided by this invention can quickly and stably provide a backup gas source to ensure the stability of the nitrogen flow.