14 results about "Electric flux" patented technology

The invention discloses a trench LDMOS (Laterally Diffused Metal Oxide Semiconductor) transistor with a ring gate structure and a multi-surface high-K dielectric region. The transistor comprises a substrate layer, a buried oxide layer, a silicon film layer and a device top layer. High-K medium thin layers with the same thickness and K value are arranged on the outer surface, except the bottom, of the silicon material in the silicon film layer; and the gate adopts a ring gate structure distributed around the source region. The large-area covered high-K dielectric thin layer is favorable for guiding electric flux and modulating the distribution of a circle of electric field of the annular groove, so that the distribution of the electric field around the groove is more uniform, the RESURF effect is improved, and the breakdown voltage of the device is favorably improved; meanwhile, the high-K medium is helpful to assist in depletion of the drift region, so that the doping concentration of the drift region is improved, and the on-resistance of the device is greatly reduced. In addition, the high-K dielectric thin layer is arranged in a surrounding manner, so that the gate electrode can be embedded in the high-K dielectric thin layer in a surrounding manner to form an annular gate structure; therefore, the problem that the source end of the device is broken down in advance due to the fact that the contacted high-K dielectric is too thick can be prevented.

Device for contactless excitation of at least one electroluminescent pigment in a valuable or security document (2), wherein the device (1) comprises at least one electrode (6), wherein the at least one electrode (6) is designed such that an electric flux density of the field (9) generated by the electrode (6) in a predetermined direction of radiation (9) changes, wherein the device has several electrodes (6), each of the electrodes (6) being designed such that the electric flux density of the field (7) that can be generated by an electrode (6) in a predetermined direction of radiation (9) changes, characterized by the fact that all electrodes (6) have a common direction of radiation which is directed from the electrodes towards the valuable or security document and is oriented parallel to a central longitudinal axis of the electrodes.

The invention discloses a partial silicon-on-insulating-layer LDMOS device with a double-sided variable-high-K dielectric structure. The LDMOS device comprises a substrate layer, a buried oxide layer, a silicon film layer and a device top layer which are sequentially arranged in a stacked mode. The silicon film layer comprises a silicon material main body and a high-K dielectric region; high-K dielectric regions are arranged on two sides of the silicon material main body; the high-K medium region comprises a first high-K medium and a second high-K medium which are arranged in parallel; the first high-K medium and the second high-K medium are equal in width and different in K value. By arranging the first high-K medium and the second high-K medium with the same width and different K values, the electric flux can be guided, the distribution of the electric field of the device can be modulated, and the electric fields at the source and drain ends can be reduced, so that the electric field distribution on the surface of the device is more uniform, the problem that the device is broken down in advance due to overhigh voltage at the source and drain ends is prevented, and the breakdown voltage of the device is improved.

The present invention provides a parallel simulation method for the nonlinear interaction between laser and matter, comprising the following steps: introducing the plasma rate equation of the nonlinear optical effect involved in the interaction between laser and matter into the Maxwell equation as an additional differential equation to obtain the density of the excited free electron plasma; constructing a constitutive equation according to the Kerr polarization intensity, the multi-photon ionization polarization intensity, the Drude polarization intensity and the electric flux density; deforming the Maxwell equation by using the relationship between the polarization current and the polarization intensity; solving the magnetic field at time t from the electric field at time t, and solving the electric displacement vector at time t from the magnetic field at time t; numerically solving the constitutive equation by the Newton iteration method, and updating the electric field at time t from the electric displacement vector at time t; and solving the free electron plasma density rate equation by the Runge-Kutta method. In the process of solving the constitutive equation by the Newton iteration method in the present invention, matrix reconstruction is performed on the physical quantities related to the optical field.

The utility model relates to the technical field of civil engineering materials and tests, and particularly discloses an electric flux test piece coring device. The device comprises a device body, the device body comprises a supporting seat, and the side wall of one end of the supporting seat sinks inwards to form a clamping groove for containing a concrete block; a vertical rod perpendicular to the supporting base is arranged above a clamping assembly used for clamping and fixing the concrete block in the clamping groove, and a coring machine which moves in the length direction of the vertical rod and stretches into the clamping groove is arranged on the vertical rod. The situation that the cut cylindrical test piece is damaged due to the fact that the concrete block shakes when being cut by the coring machine can be prevented.

The invention relates to a structure for improving the breakdown voltage of a vertical type diamond MOSFET through a High K dielectric and a preparation method thereof.The structure comprises a diamond substrate, an epitaxial layer, a groove, a diamond regeneration layer, a source electrode, a passivation layer, a gate electrode, a High K dielectric layer and a drain electrode, the High K dielectric layer is introduced to the surface of the groove, the electric flux distribution is guided through the high dielectric constant characteristic of the High K dielectric layer, and therefore the breakdown voltage of the vertical type diamond MOSFET is improved. Therefore, the electric field distribution of the channel region is optimized, an electric field regulation and control effect similar to a super junction is formed, and the source-drain breakdown voltage of the vertical diamond MOSFET is effectively improved without damaging the on-resistance. The preparation method comprises the steps of substrate selection, epitaxial growth, dry etching to form a groove, regeneration layer repair, formation of a source electrode and a drain electrode, surface terminal treatment, passivation layer deposition, gate electrode deposition, introduction of a High K dielectric layer and the like. By introducing the High K dielectric on the surface of the diamond channel, high breakdown voltage and low on-resistance are taken into account, and the high-power semiconductor device is suitable for the field of high-power electronic devices.

This invention provides a preparation method and application of a novel memristor for neural network visual perception. Using ultrasonic atomization deposition, molybdenum disulfide nanosheets are asymmetrically deposited on a defective graphene electrode through a mask on a silicon dioxide substrate. Heating then induces partial oxidation of the graphene and molybdenum disulfide, forming an asymmetric photovoltaic-effect graphene oxide / oxygen-doped molybdenum sulfide / graphene oxide device, which serves as a novel memristor for neural network visual perception. This invention proposes a novel device, preparation method, and application that modulates the photoresponsivity of devices at both ends by memorizing the electrical flux flowing through the device.

The present application relates to the field of microwave plasma technology, and more particularly to a wideband atmospheric microwave plasma torch, which mainly comprises an outer conductor, an inner conductor, an RF joint and a discharge device. The inner conductor comprises a first tapered end, a cylinder and a second tapered end. The cylinder is connected between the first tapered end and the second tapered end. The first tapered end is connected with the RF joint, and the second tapered end is connected with the discharge device. Through the above structure, the second tapered end at the end of the inner conductor (electrode) is enlarged to increase the electric flux and expand the excitation area of the plasma torch, so that the stable excitation of the large-flow and large-volume plasma flame can be realized. The increase of the electrode will cause the impedance mismatching to be unbalanced. Two gradually changing impedance matching structures are added to the design of the torch body to achieve good matching between the electrode end disc and the coaxial structure.

The present invention discloses a numerical solution method and system for ground penetrating radar based on divergence-preserving ADI-FDTD, belonging to the field of efficient numerical simulation of electromagnetic waves in ground penetrating radar. The method includes: listing the differential time domain of the Maxwell's equations of the ground penetrating radar; discretizing the differential time domain into a matrix form; for a multi-pole Debye dispersive medium with a loss term, constructing a constitutive relation between the electric flux density and the electric field strength; transforming the constitutive relation from the frequency domain to the z domain, and then through the transformation between the z domain and the time domain, converting it to the time domain, and substituting it into the matrix form discretized from the differential time domain to obtain a discrete matrix form based on the time domain, and discretizing it into two sub-time step iterations to obtain a basic numerical discretization framework; calculating the numerical discretization equations of each component of the electric field and the magnetic field according to the basic numerical discretization framework, and calculating the electric field strength and the magnetic field strength, and deriving the electric field strength and the magnetic field strength that satisfy divergence preservation.

The invention discloses a method for preparing a pure-phase doped ternary precursor by a spray pyrolysis method based on a nitrate system, and relates to the technical field of functional oxide material synthesis, and the method comprises the following steps: establishing a time baseline and electric heat flow field chromatography network, carrying out continuous sampling on droplet charge distribution in a spray area, constructing a charge flux spectrum, and calculating the charge flux spectrum. And micro-discharge prior fingerprints are extracted to form a charge space-time reference. According to the method, discharge precursor identification and early warning are realized through charge space-time reference and potential inversion, a crystal nucleus disturbance region is identified in combination with anti-fact backtracking, energy redistribution is realized through charge pumping, micro-vortex traction and off-peak driving under the guidance of an energy coupling track, and a closed-loop regulation environment is constructed, so that amorphous generation is inhibited, and the stability of the system is improved. The doping uniformity, the crystal phase purity and the particle size controllability are improved, and the method is suitable for large-scale preparation of high-performance positive electrode materials.

The utility model relates to the technical field of concrete test piece detection, in particular to an electric flux test piece sealing device. The electric flux test piece sealing device comprises a workbench, a clamping assembly and a discharging assembly. The clamping assembly is used for clamping the two ends of the test piece in the axis direction of the test piece, and the clamping assembly is rotatably connected with the workbench; the discharging assembly is connected with the workbench, located over the test piece clamped by the clamping assembly and used for guiding and conveying a fluid sealing material to the peripheral face of the test piece. The rotation axis of the clamping assembly relative to the workbench and the axis of the test piece are parallel to the horizontal direction. The electric flux test piece sealing device is simple in structure, convenient to operate and capable of quickly brushing a sealing material, so that the preparation period of the test piece can be shortened, the test efficiency can be improved, meanwhile, the uniformity of the sealing material can be improved, and the adverse effect of the uniformity of the sealing material on a test structure can be reduced.

The utility model provides a test piece sealing device for an electric flux test. The test piece sealing device comprises a supporting table, the rotary sleeve is rotationally arranged on the fixed support, and a glue injection opening is formed in the rotary sleeve; the fixing mechanism is rotationally arranged on the supporting table and is used for fixing the test piece in the rotating sleeve or loosening the test piece; and the trowelling mechanism is arranged on the inner side wall of the rotating sleeve and is used for trowelling the glass cement on the surface of the test piece. According to the utility model, the defects of low manual smearing efficiency, non-uniform thickness and the like are overcome, and the electric flux test efficiency and the data accuracy are improved.

The invention discloses a ground penetrating radar numerical solution method and system based on divergence-keeping ADI-FDTD, and belongs to the field of efficient numerical simulation of electromagnetic waves in ground penetrating radars. The method comprises the following steps: listing a differential time domain of a Maxwell equation set of the ground penetrating radar; discretizing the differential time domain into a matrix form; constructing a constitutive relation between the electric flux density and the electric field intensity for the multipolar Debye dispersive medium with the loss item; transforming the constitutive relational expression from a frequency domain to a z domain, transforming the constitutive relational expression into a time domain through transformation between the z domain and the time domain, substituting the constitutive relational expression into a matrix form discretized by the differential time domain to obtain a discrete matrix form based on the time domain, and discretizing the discrete matrix form into two sub-time step iterations to obtain a basic numerical discretization framework; and calculating a numerical discretization equation of each component of the electric field and the magnetic field according to the basic numerical discretization framework, calculating the electric field intensity and the magnetic field intensity, and deducing the electric field intensity and the magnetic field intensity meeting the divergence keeping degree.