254 results about "Lorentz force" patented technology

The invention discloses a magnetofluid type silicon controlled rectifier radiator and a heat dissipation control method thereof. The radiator comprises a silicon controlled rectifier, a magnetic fluid chamber is attached to the outer side of the silicon controlled rectifier, the magnetic pole array is installed in the magnetic fluid chamber, and cooling fins are assembled outside the magnetic fluid chamber. When alternating current is introduced into the cavity where the magnetic fluid liquid chamber is located, the alternating current and the magnetic field interact to generate Lorentz force, the Lorentz force drives the magnetic fluid to form directional eddy current so as to achieve convective heat exchange on the silicon controlled rectifier, and heat absorbed by the magnetic fluid and air are subjected to heat exchange through the cooling fins. Junction temperature out-of-control caused by local hot spots of the silicon controlled rectifier can be solved, secondary damage of mechanical vibration of a heat dissipation system to welding spots is eliminated, and the highest junction temperature area of the silicon controlled rectifier is focused and cooled according to needs.

The invention relates to a preparation method of a magnetic field-electric field synergistically driven Fe3O4-loaded graphene three-dimensional interlocking network / metal composite material, and belongs to the field of electronic packaging materials. An alternating magnetic field and a direct-current electric field are applied in the solidification process of metal melt, Lorentz force is used for driving graphene nanosheets loaded with Fe3O4 to rotate directionally and be arranged vertically, meanwhile, the electric field induces dissociation of graphene edge functional groups, chemical bonding with a metal matrix is enhanced, and a space interlocking heat conduction network is formed. The graphene reinforced metal composite material is obviously superior to a traditional graphene reinforced metal composite material and is suitable for a heat dissipation substrate of aerospace electronic equipment.

The invention discloses a wafer carrier with a position correction function, and relates to the technical field of wafer carriers. Comprising a base, a fixed cylinder is arranged on the upper side of the base, damping springs are installed on the outer side of the fixed cylinder, a first coil is embedded in the lower side of the fixed cylinder, the two ends of the first coil are electrically connected with a control system, a guide column is installed in the fixed cylinder, and a detection ball and a push plate are installed between the fixed cylinder and the guide column; a wafer is carried on the carrying plate, a conducting medium is arranged on the carrying plate, the conducting medium annularly flows along the inner wall of the outer ring electrode under the influence of Lorentz force, the heated conducting medium annularly flows in the heating cavity and continuously makes contact with the heating wire, the temperature of the conducting medium is more uniform, and the heating efficiency is improved. Therefore, the overall temperature of the heating chamber becomes uniform, so that the wafer and the tray are preheated by the carrying groove, the wafer reaches the required temperature, and the wafer processing efficiency is improved.

The invention discloses a novel induction-type magneto-thermo-acoustic detection method for the conductivity of a supercapacitor, and relates to the technical field of nondestructive material detection.The method comprises the steps that a steady-state static magnetic field and a pulse alternating magnetic field are introduced to form a composite excitation field, and a magneto-acoustic effect and a thermo-acoustic effect are simultaneously and cooperatively excited in a solid-state electrode material; the magnetoacoustic-thermoacoustic coupling effect is formed, eddy current induced by a pulse alternating magnetic field in the material not only generates joule heat, but also generates a direct carrier of Lorentz force under the action of a steady-state static magnetic field, the two physical effects are derived from the same electromagnetic excitation process, but the mechanisms for generating acoustic signals are complementary to each other, so that the effect of the magnetoacoustic-thermoacoustic coupling is achieved. The two effects are coupled as a unified sound source item, a sound pressure wave equation is established, the equation describes a sound field excitation process under the combined action of a force source and a heat source, the coupling mechanism remarkably enhances the strength and information abundance of ultrasonic signals, and the inherent defect that a single thermoacoustic detection method is insensitive to a high-conductivity material is overcome.

A kind of method for melting pole twisted wire arc magnetic spin control welding.The prior art twisted wire welding is prone to produce blowhole in weld inside when large current welding, and excessive heat input will cause changes in structure and performance in joint area, such as problems of weld zone grain growth, joint plasticity, toughness and other mechanical properties decline, etc.The present application comprises: twisted wire welding electrode arc welding point, a coaxial coil is arranged around the twisted wire welding electrode arc welding point, direct current is passed into the coaxial coil to form longitudinal magnetic field, the force direction of longitudinal magnetic field on twisted wire welding arc should be consistent with the self-rotating direction of twisted wire welding arc, and opposite to the twisting direction of twisted wire, the direction of longitudinal magnetic field is controlled by the direction of direct current, while twisted wire melts to form its own twist angle release, the twist angle release is affected by Lorentz force to make the rotational angular velocity of twisted wire welding arc rapidly increase, to realize high-speed directional rotation of twisted wire welding arc.The present application is used for melting pole twisted wire arc magnetic spin control welding method.

The invention discloses an inductor noise optimization method based on multi-physics field simulation, and belongs to the technical field of magnetic component simulation design. According to the method, COMSOL software is adopted to customize a solution domain equation to calculate three kinds of electromagnetic force coupling of Lorentz force, Maxwell force and magnetostriction force of the inductor, the coupling is converted into electromagnetic force in a frequency domain through Fourier transform, solid mechanical field simulation is carried out, and magnetostriction generated by an electromagnetic field is coupled to a solid mechanical field in a strain form; calculating the surface acceleration of the inductor in the frequency domain; and then simulating an external sound field of the inductor by taking the surface acceleration of the inductor in the frequency domain as an excitation source of pressure acoustics to obtain a change diagram of the sound pressure level at the noise point to be detected along with the frequency. By the adoption of the method, various electromagnetic forces borne by the inductor can be comprehensively considered, simulation time can be greatly shortened by conducting simulation of the solid mechanical field and the pressure acoustic field in the frequency domain, and therefore noise simulation of the inductor is accurately and efficiently completed.

The invention discloses a preparation method of a high-temperature superconducting wire strip with high strength, high shunt and high heat-conducting property. The method comprises the following steps: 1, cleaning a semi-finished superconducting wire strip; 2, putting the cleaned semi-finished superconducting wire strip serving as a cathode and a copper electrode serving as an anode into copper sulfate electroplating liquid, and connecting with a direct-current power supply to form an electroplating device; and 3, after electroplating the cathode semi-finished superconducting wire strip, taking out the cathode semi-finished superconducting wire strip and staying in the air, and forming an electroplated layer of nano-scale copper grains by a process of repeatedly electroplating and taking out for multiple times, thereby obtaining the high-temperature superconducting wire strip. According to the invention, the surface of the semi-finished superconducting wire strip is plated with the electroplated layer of the nano-scale copper crystal grains through electroplating, and the high-temperature superconducting wire strip has high strength, high shunting and high heat-conducting properties by utilizing the strong pinning characteristic of the nano-copper crystal grains and the intrinsic high electric conductivity and high heat-conducting characteristics of copper, resists Lorentz force in a strong magnetic field, and has the characteristics of high conductivity and high heat conductivity. And the shunting and heat conduction capabilities of the high-temperature superconducting wire strip after quenching are improved, the process is simple, and industrial production is easy.

The electromagnetic auxiliary casting device for the black metal comprises a casting platform, and a sand mold is arranged on the top face of the casting platform; the casting platform is located in the three-dimensional moving frame; the top end of the three-dimensional moving frame is slidably connected with a mounting seat; the drainage pipe penetrates through the mounting seat and corresponds to the sand mold so as to inject molten metal; the composite electromagnetic stirrer comprises an annular shell, an annular coil winding and a traveling wave coil winding; the annular shell is fixed on the mounting seat and sleeves the outer wall of the drainage tube; the annular coil winding and the traveling wave coil winding are fixed in the annular shell to generate an annular magnetic field and a traveling wave magnetic field respectively; and the junction box is electrically connected with the annular coil winding and the traveling wave coil winding so as to enable the annular coil winding and the traveling wave coil winding to feed simultaneously or separately. Molten metal is drained through the drainage pipe, the traveling wave magnetic field can promote or restrain flowing of the molten metal, the rotating magnetic field generates Lorentz force to drive the molten metal to move, and active control over flowing of the molten metal is achieved.

Provided in the present invention are a magnetic resonance guided charged particle beam radiotherapy apparatus and an electromagnetic navigation parameter debugging method for target point coordinates, belonging to the technical field of radiotherapy apparatuses. The present invention comprises a charged particle beam electromagnetic navigation apparatus. The charged particle beam electromagnetic navigation apparatus comprises a multi-stage electromagnetic navigation coil, a charged particle beam sequentially passing through the multi-stage electromagnetic navigation coil to generate a parallel charged particle beam with a direction consistent with the direction of a magnetic resonance main magnetic field; and an MR imaging apparatus, comprising an MR main magnetic field coil upper group and an MR main magnetic field coil lower group, an imaging therapy area being formed therebetween. The electromagnetic navigation parameter debugging method of the present invention comprises constructing a target cost function, optimizing electromagnetic navigation parameters based on a gradient information-free optimization algorithm, and determining and outputting optimal navigation parameters. According to the present invention, the charged particle beam parallel to the MR main magnetic field can be generated, thereby greatly reducing the influence of Lorentz force on the charged particle beam, enabling to reduce the positioning difficulty of the charged particle beam on a tumor target area under MR guidance, and improving the therapeutic accuracy.

The invention provides a magnetic field enhanced SF6 circuit breaker intelligent control method and device. According to the method, waveform feature extraction and spectral analysis are carried out by acquiring arc state parameters, an intelligent decision model is constructed by adopting a hybrid machine learning and reinforcement learning algorithm to generate an optimal arc extinguishing control strategy, and differential control is implemented in different stages of an arc: an electromagnetic coil is activated in the initial stage to generate a high-intensity magnetic field to apply Lorentz force; synergistically adjusting the magnetic field and airflow in the middle stage, and strengthening airflow cooling in the later stage; meanwhile, the medium recovery characteristic is monitored, the reignition probability is calculated in real time, protection measures are triggered, the fault diagnosis function is integrated, intelligent arc extinguishing control over the SF6 circuit breaker is achieved, and the large-current breaking capacity and reliability are remarkably improved.

The invention belongs to the technical field of micro-electro-mechanical systems (MEMS) and the technical field of electric field / magnetic field detection, and particularly provides an electric field-magnetic field composite integrated resonant MEMS sensor which is used for solving the problem that a traditional resonant MEMS sensor can only sense a single environment parameter. According to the electric field-magnetic field composite integrated resonant MEMS sensor provided by the invention, accurate measurement of a direct-current electric field in a space thickness direction (Z axis) is realized by using an out-of-plane flapping mode of a disc resonant sensing unit fixed by four T-shaped anchor points; the measurement of an out-plane Z-axis magnetic field and an in-plane X-axis magnetic field is realized through the effect of Lorentz force on a metal wire loop which is arranged on the surface of the disc resonance sensing unit and is charged with alternating current in the magnetic field; therefore, the composite integrated sensing of two parameters of an electric field and a magnetic field by the same device is realized, and the number of required sensors and the occupied area of a chip are reduced.

The invention relates to an N-pole module assembly of a circuit breaker and the circuit breaker. The N-pole module assembly of the circuit breaker comprises a main body function module and a current detection module, and further comprises a first N-pole conductive plate fixedly integrated on the main body function module and a second N-pole conductive plate fixedly integrated on the current detection module, and the main body function module and the current detection module are respectively two independent modular structures. And the first N-pole current-conducting plate and the second N-pole current-conducting plate are fixedly and electrically connected to form an N-pole electric loop. According to the invention, the complicated bending and wiring process of the soft wire in the N-pole module assembly in the prior art is avoided, the assembly is convenient, and the automatic assembly can be realized. Moreover, through the special arrangement of the relative positions of the N-pole electric loop and the L-pole electric loop, the Lorentz force generated by the magnetic field generated by the current on the N-pole electric loop on the electric arc in the circuit breaker unit can assist the electric arc to be further pushed and lengthened, and the effect of enhancing the magnetic quenching function can be achieved.

The invention provides a magnetic resonance guided charged particle beam radiotherapy device and an electromagnetic navigation parameter debugging method for target coordinates, and belongs to the technical field of radiotherapy devices. The system comprises a charged particle beam electromagnetic navigation device which comprises multiple stages of electromagnetic navigation coils, charged particle beams sequentially pass through the multiple stages of electromagnetic navigation coils, and parallel charged particle beams consistent with a magnetic resonance main magnetic field in direction are generated; the MR imaging device comprises an MR main magnetic field coil upper group and an MR main magnetic field coil lower group, and an imaging treatment area is formed between the MR main magnetic field coil upper group and the MR main magnetic field coil lower group. The electromagnetic navigation parameter debugging method comprises the steps of constructing a target cost function, optimizing electromagnetic navigation parameters based on an optimization algorithm without gradient information, and determining and outputting optimal navigation parameters. According to the invention, the charged particle beam parallel to the MR main magnetic field can be generated, the influence of Lorentz force on the charged particle beam is greatly reduced, the difficulty of positioning a tumor target region by the charged particle beam under the guidance of MR can be reduced, and the treatment accuracy is improved.

The invention discloses a multi-parallel coil electromagnetic Hopkinson bar and a cooperative control method, and the multi-parallel coil electromagnetic Hopkinson bar comprises a controller which is used for controlling the discharge time of a plurality of capacitors; the plurality of capacitors are respectively used for discharging according to the discharging time; the main coil is used for generating a corresponding target Lorentz force in response to the discharge of the capacitor so as to apply an impact load to the tested piece by using the target Lorentz force and complete the dynamic mechanical property test of the tested piece; wherein the main coil comprises a plurality of sub-coils which are arranged in a symmetrical annular array; each sub-coil is of an annular spiral structure, and any two adjacent sub-coils are different sub-coils; and each capacitor is connected with the corresponding sub-coil.

Provided is a spectrometry device equipped with a drive mechanism capable of easily controlling the movement of a movable portion at a low and constant speed. An actuator is used as the drive mechanism, the actuator comprising: a conductor (231a) that extends in a first direction; a current supply unit that passes a current through the conductor; magnetic field sources (232a, 232b) that apply, to the conductor, a magnetic field in a direction having a directional component orthogonal to the first direction and a second direction (A) that is non-parallel to the first direction; a movable element (231) that moves in the second direction due to a Lorentz force generated by the current flowing through the conductor or a reaction to the Lorentz force; an elastic body (233) that resists the movement of the movable element; and a current control unit that controls the current supply unit such that the magnitude of the current flowing through the conductor changes with a predetermined rate of change over time that corresponds to the elastic characteristics of the elastic body.

An apparatus for producing drops of liquid metal for additive manufacturing comprises a reservoir for supplying liquid metal and a pressure chamber in fluid communication with the reservoir. The pressure chamber has a channel therein where compressive forces are applied on the liquid metal therein. Upper and lower electrodes apply a current through the liquid metal in the pressure chamber. This current creates an electric field that produces radially inward directed Lorentz forces on the liquid metal. This compressive force provides pressure in the longitudinal direction for ejecting the liquid metal through the orifice to form liquid metal droplets.

The invention discloses a magnetic quenching device which comprises two pieces of magnetic steel used for generating a magnetic field and an arc extinguishing grid sheet made of low-carbon steel, the two pieces of magnetic steel are arranged in a front-and-back spaced mode, the arc extinguishing grid sheet is located between the two pieces of magnetic steel, each piece of magnetic steel is bipolar magnetizing steel, and the two pieces of magnetic steel are respectively called first magnetic steel and second magnetic steel according to the front-and-back sequence. A first low-carbon steel plate is attached to the front side face of the first magnetic steel, a second low-carbon steel plate is attached to the rear side face of the second magnetic steel, the two pieces of magnetic steel, the first low-carbon steel plate and the second low-carbon steel plate form a closed magnetic circuit structure, and the first low-carbon steel plate and the second low-carbon steel plate are both used for gathering a magnetic field to reduce magnetic leakage. The device has the advantages that a strong magnetic field can be generated, large Lorentz force is provided, and rapid stretching and extinguishing of an electric arc are achieved.

A plasma generating system having an igniter or other plasma generator for use in low pressure environments, such as occurs in aviation. Combustion is initiated with an electrode configuration having a large usable area of electrodes for high current plasma discharge over a longer length of the electrodes, resulting in a long useful life of the plasma generator. The plasma generation system includes circuitry that generates and propagate plasma along the electrodes by a Lorentz force and a thermal force using high currents that move the plasma along the electrodes without causing a destructive material state change in the electrodes.

An electromagnetic forming method and device based on a three-coil dual-power supply board. The method includes the following steps: S1. Clamp the edge of the metal board to fix the metal board, place a background magnetic field coil and an eddy current coil above the metal board, and place an improvement coil below the metal board; S2. Connect the background magnetic field coil to a long-pulse-width power supply system to generate a background magnetic field; S3. When the long-pulse-width pulse current reaches the peak value, connect the eddy current coil and the improvement coil in series and then connect them to a short-pulse-width power supply system, so that the board in the magnetic field is subjected to an upward Lorentz force and deforms upward. The present invention realizes a new scheme for forming a board by the cooperation of three groups of coils under the action of attractive electromagnetic force. By controlling the discharge voltage and the capacitor capacitance value in the three groups of power supply devices, the eddy current and the magnetic field can be flexibly regulated, and the diversified loading of the Lorentz force can be realized.

The invention discloses an oil paper insulation life evaluation method, device and equipment of a converter transformer and a medium, and relates to the technical field of electric power engineering, and the method comprises the steps: building an insulation life improvement model based on a linear cumulative damage theory and a thermal aging model; carrying out numerical solution on the electromagnetic field and the solid force field to obtain Lorentz force density and mechanical damage accumulation equivalent stress distribution, and determining an equivalent stress translation factor by utilizing the mechanical damage accumulation equivalent stress distribution; solving numerical values of the oil paper insulation space temperature field and the electromagnetic field to obtain total eddy current loss, and determining a temperature translation factor based on the Lorentz force density, the total eddy current loss and the oil paper insulation space temperature field; calculating total acceleration factor distribution by using the equivalent stress translation factor and the temperature translation factor, inputting the total acceleration factor distribution into the insulation life improvement model, and outputting space life distribution; and carrying out oil paper insulation life evaluation on the converter transformer, realizing quantitative evaluation on insulation fatigue damage under the action of cyclic load, and comprehensively evaluating the life of an insulation material.

The application discloses a lens module and a camera device with the same. The lens module comprises a lens barrel, a movable part and an electromagnetic driving assembly. The lens barrel is internally provided with a containing space. The movable part is used for carrying an image sensor. Part of the movable part used for carrying the image sensor is located below the containing space. The electromagnetic driving assembly comprises a coil and a magnetic body. The electromagnetic driving assembly is arranged below the containing space. The electromagnetic driving assembly drives the movable part to move by generating Lorentz force or magnetic force between a magnetic field generated by energizing the coil and the magnetic body, so as to drive the image sensor to move. According to the lens module of the embodiment of the application, focusing is realized by driving the image sensor to move instead of driving the lens assembly to move, so that the driving force required by the lens module is smaller, the space reserved for the image sensor by the lens module is smaller, and the thickness in the axial direction can be saved.

This invention discloses a high-performance electromagnetic pulse (EMP) welding process for tubular components, comprising the following steps: configuring a corresponding intermediate layer and drive tube according to the welding process requirements of the target weldment; sequentially assembling the inner tube, intermediate layer, and outer tube; sequentially assembling the drive tube, magnet collector, and electromagnetic generating coil; setting the charging voltage and energy storage level of the pulse capacitor; charging the pulse capacitor bank in the charging circuit to a preset voltage; rapidly discharging the high-voltage electrical energy stored in the capacitor bank to the electromagnetic generating coil to generate a transient strong magnetic field; a huge Lorentz force is induced inside the drive tube, propelling the outer tube to violently impact inward at extremely high speed. This invention can achieve high-performance electromagnetic pulse welding of multi-property material combinations and multi-size tubular components; through the design of the magnet collector and drive unit, it achieves electromagnetic pulse welding of low-conductivity, small-gap tubular components; and innovatively proposes the concept of an intermediate layer, thereby realizing the welding of dissimilar or high-performance, difficult-to-join metals.

Various Freight left hand rules (motor rules), right hand rules (engine rules), Ampere rules 1, Ampere rules 2 (right hand spiral rules), Lorentz forces, Ampere forces and the like exist in the fields of electrotechnics, electromagnetics, optics and the like and are used for judging current, magnetic fields and acting force directions. And memory disorder of students and technicians is easily caused. The electronic magnetic pole and the spinning direction (figure 1 in the specification) are marked by using an electronic spinning right-hand rule expression method, and all the rules and forces can be replaced and unified. And three breakthrough discoveries are caused: (1) an electron magnetic pole and a spinning direction rule are caused; and (2) the electromagnetic field is the expansion, static and retraction type expression of the electronic ring. And (3) the expansion type electronic ring has the characteristics of electromagnetic wave (including light wave) particles, fluctuation, electromagnetism, quantum and the like, and solves the optical hundred-year competition problem. And more electronic equipment and products can be developed according to the'electron spin right hand rule '.

According to the dissimilar metal material melt-brazing optimization method and device, a Ti2AlNb plate and a titanium alloy plate are sequentially arranged between an electrode and a controllable magnetic field, welding current is applied to the Ti2AlNb plate through the electrode so as to generate Joule heat, and by means of the blocking effect of a high-resistivity oxidation film between the plates, the welding temperature of the Ti2AlNb plate and the welding temperature of the titanium alloy plate can be controlled. The upper surface of the titanium alloy plate is uniformly heated to be molten to form a molten material, the molten material flows and is stirred at a high speed under the action of a controllable magnetic field below the titanium alloy plate and a Lorentz force generated by welding current, aggregation of oxide film defects near an interface is inhibited, and heterogeneous materials on the two sides of the interface form a thin and uniform intermetallic compound. The high-melting-point metal is adopted for heating, the controllable magnetic field is arranged in cooperation with staged matching of the welding current, local melting of the low-melting-point metal is achieved through uniform temperature rising and heat transfer of the high-melting-point metal, the nugget growth process and the low-melting-point metal oxide film breaking process are accurately regulated and controlled, and finally the brazing interface is formed.

The application relates to the technical field of plasma, in particular to a processing device for coaxial pulse trapezoidal magnetic field regulated plasma jet, which comprises a gas-liquid control module, a plasma generation module, a pulse trapezoidal magnetic field generation module, a power excitation module, a synchronous controller and a plasma processing module; the pulse trapezoidal magnetic field generation module is connected with the plasma generation module and is used for generating a coaxial pulse trapezoidal magnetic field with adjustable parameters; the radial component of the coaxial pulse trapezoidal magnetic field is perpendicular to the movement direction of charged particles in the plasma jet, the plasma jet is provided with a radial expansion or contraction Lorentz force, and the processing area of the plasma jet is adjusted. The device provided by the application generates a stable, dispersed, gas-temperature-near-room-temperature and adjustable-action-area plasma jet, realizes efficient, accurate and low-energy-consumption processing of a target object, and achieves good processing effect.

The invention discloses a soot blowing pipeline wall thickness online monitoring method based on temperature self-adaption, and relates to the technical field of industrial pipeline nondestructive testing. The problems that in the prior art, a detection signal is unstable in a high-temperature environment, and the micro corrosion thinning recognition precision is insufficient can be at least partially solved. The method comprises the steps that the surface temperature of a pipeline is collected, and the force contribution ratio of Lorentz force to magnetostriction force is calculated; dynamically optimizing electromagnetic ultrasonic body wave excitation parameters according to the force contribution ratio; body waves are excited point by point in the axial direction of the pipeline, and echo signals are collected; extracting bottom wave features by using empirical mode decomposition and wavelet threshold combined noise reduction; calculating the wall thickness of each measuring point based on the temperature correction sound velocity; and generating a B-scan image and carrying out grading evaluation according to the percentage of the thinning amount. According to the method, the wall thickness is accurately measured under the high-temperature working condition, signal stability is ensured through temperature self-adaptive parameter optimization, the signal-to-noise ratio is remarkably improved through combined noise reduction, wall thickness distribution is visually presented through B scanning imaging, and reliable data support is provided for safe operation and maintenance of a pipeline.

external magnetic field - coil with right-hand winding (4) resting on the outer surface of the annular cathode electrode as an encompassing device to generate a magnetic field which, in interaction with the electrolyte current, causes a "Lorentz force" to magnetohydrodynamically accelerate the faster detachment of hydrogen gas bubbles from the outer cathode surface

The present invention belongs to the technical field of laser brazing, and particularly relates to an electromagnetic field-assisted laser brazing method. First, pre-welding cleaning is performed, and then mixed brazing material powder is pre-placed, and the mixed brazing material powder is coated on the groove of a specimen. The dried specimen is clamped between two electromagnetic coils on an electromagnet above a workbench in an argon protection chamber, and the current of a direct current power supply I is clamped at both ends of the weld of the specimen. The current at the weld passes through the electromagnetic coil and the Lorentz force generated is directed downward, so that the brazing material fills the brazing seam downward, and then the argon protection chamber is evacuated and filled with argon, and finally laser brazing is performed. The present invention pre-places the brazing material at the part to be welded, and in the protection of an argon atmosphere, heats and melts the brazing material with a laser heat source, and simultaneously couples a steady-state electric field and a magnetic field to form an electromagnetic composite field. The molten brazing material fills the brazing seam downward under the action of the directional Lorentz force of the electromagnetic field, promotes the flow of the brazing material in the gap, reduces the formation of defects such as pores in the weld, and improves the welding quality.

The present invention discloses a fire inspection drone with self-checking control, which relates to the technical field of drones and comprises a drone body; rotor assemblies are equidistantly arranged on all sides of the drone body; a control assembly is fixedly arranged at the bottom of the rotor assembly arm; and a mounting assembly is fixedly installed at the bottom of the drone body; a single controller is used to scan fire sources and centrally control the fire source, and a hook cable assembly is used to push out a sliding rod and a casting rod at high speed to remove bird nests, dead wood, or break windows to open roads; based on the temperature-controlled deformation of a memory alloy and a pneumatic-magnetic cooperative mechanism, automatic casting and continuous loading of fire extinguishing bombs are achieved; when encountering strong turbulence, a built-in ionic fluid cuts the static magnetic field of a first permanent magnet to generate Lorentz force damping, actively suppressing sudden changes in posture; and key parameters are monitored to ensure safety, integrating the four functions of detection, demolition, fire extinguishing, and stabilization into one.

The invention discloses a gallium oxide-based transverse FinFET (FinFET) device with high electron mobility, which mainly solves the problems of small channel mobility and large on-resistance and thermal resistance effects of the existing similar devices. The device comprises a substrate (1), a barrier layer (2) and a channel layer (3) from bottom to top, the channel layer (3) adopts a Fin structure, a source electrode (4) and a drain electrode (5) are respectively arranged at two ends of the channel layer (3), and a gate dielectric layer (6) and a gate electrode (8) are arranged between the source electrode and the drain electrode; a magnetic thin film layer (7) is arranged on the gate dielectric layer corresponding to the groove between the Fin channel layers and is used for providing magnetic field force in a channel and applying Lorentz force from bottom to top to moving electrons, so that the channel electrons perform directional movement under the synergistic effect of the Lorentz force and the electric field force, the probability of electron collision and scattering is reduced, and the performance of the device is improved. And the carrier mobility of the device is improved. Under the condition that the process complexity is not increased, the on resistance and the thermal resistance effect of the device can be effectively reduced, and the device can be used as a power electronic device.