133 results about "Composite field" patented technology

There is provided a controller for a motor capable of changing the phase difference between two rotors that can prevent demagnetization of permanent magnets or the rotors. The motor has two rotors each having a permanent magnet and phase difference changing driving means for changing the phase difference between the rotors. The controller has a demagnetization determining means for determining whether or not demagnetization of the permanent magnets of the rotors occurs during operation of the motor, and rotor phase difference controlling means for controlling the phase difference changing driving means to change the phase difference between the rotors from a current phase difference to a phase difference that results in a higher strength of a composite field of the permanent magnets if the result of determination by the demagnetization determining means is positive.

A composite field effect transistor, in accordance with one embodiment, includes a zener diode, a junction field effect transistor and a metal-oxide-semiconductor field effect transistor. A gate of the junction field effect transistor is coupled to an anode of the zener diode. A cathode of the zener diode is coupled to a gate of the metal-oxide-semiconductor field effect transistor. A drain of the metal-oxide-semiconductor field effect transistor is coupled to a source of the junction field effect transistor.

The present invention relates to one kind of composite electromagnetic field build-up welding method, apparatus and expanded application, and is composite electromagnetic field controlled gas protected build-up welding method. The welding apparatus is provided with exciting power source, exciting device, auxiliary electric field device and water cooling system. The exciting device has electromagnetic stirring exciting coil and electromagnetic heat treatment exciting coil; and the auxiliary electric field device includes one pair of movable electrodes. Through electromagnetic stirring, electromagnetic heat treatment and the compound effect of auxiliary electric field and the welding torch, the present invention realizes the build-up welding of alloy material in high efficiency, high quality and low cost.

A system and method provides optimization of the strength and orientation of the inductive field of a hearing aid compatible (“HAC”) device, relative to a telecoil in a user's hearing aid. One aspect provides control of the drive level of a transmitting telecoil contained in the HAC device. Other aspects provide steering of the inductive field of the device by using a telecoil array and controlling the amplitude or phase of the signals transmitted by each telecoil in the array to create a composite field. Another aspect provides a plurality of transmitting telecoils arranged such that each telecoil has a different orientation, and a plurality of switches for controlling which transmitting telecoil is active. The user may then select the telecoil having a preferred orientation. Another aspect allows a transmitting telecoil to be physically oriented to an optimal position by embedding the telecoil in a substantially spherical element.

A linear ion trap includes four electrodes and operates with an asymmetrical trapping field in which the center of the trapping field is displaced from a geometrical center of the trap structure. The asymmetrical trapping field can include a main AC potential providing a quadrupole component and an additional AC potential. The main AC potential is applied between opposing pairs of electrodes and the additional AC potential is applied across one pair of electrodes. The additional AC potential can add a dipole component for rendering the trapping field asymmetrical. The additional AC potential can also add a hexapole component used for nonlinear resonance. A supplementary AC potential can be applied across the same pair of electrodes as the additional AC potential to enhance resonant excitation. The operating point for ejection can be set such that a pure resonance condition can be used to increase the amplitude of ion oscillation preferentially in one direction. Ions trapped in the composite field can be mass-selectively ejected in a single direction to an aperture in one of the electrodes.

The invention provides a ship intelligent obstacle avoidance method based on an artificial potential field. The method comprises a step of collecting ship information, inland waterway information andobstacle information in real time, a step of establishing an inland waterway coordinate system based on the collected information and establishing a waterway boundary repulsion potential field model and an obstacle repulsion potential field model based on an artificial potential field method, a step of establishing a balance equation according to composite field effect formed by superposing a waterway boundary repulsion potential field and an obstacle repulsion potential field borne by a ship during the processing of navigation, carrying out solution to obtain position points which the ship isabout to pass in intelligent obstacle avoidance, and fitting the position points to obtain an obstacle avoidance route, and a step of controlling the heading and speed of the ship according to the obstacle avoidance route. According to the method and the system, a practical support is further provided for the realization of the ship intelligent obstacle avoidance, and the probability of collisionwith an obstacle is greatly reduced.

The invention relates to a quality improving method for horizontal continuous casting blanks by applying complex field and the device, belonging to the technical field of preparation of metal material, in particular to the technology of applying complex electromagnetic field and ultrasonic field in the continuous casting process of metal casting blanks. The device is characterized in that a generator of inert gas is arranged at the center of the bottom of a holding furnace; a generator of traveling wave magnetic field is arranged on the side of the holding furnace; a power ultrasonic device is arranged on the holding furnace close to the water port; a restriction electromagnetic coil is arranged on the outer side of a crystallizer. The device has the advantages that: firstly, the production technology is simple, the operation is easy, and the efficiency is high; secondly; the disadvantages of easy broken in rolling and drawing process of casting blank due to more impurity and pores is solved; thirdly, the solidification structure of the casting blanks is uniform, the crystal grain is fine, and the casting blanks can be rolled directly at casting state. The quality improving method and the device are mainly used for the field of metal continuous casting.

A change in torque produced by a motor having two rotors is reduced when the motor operates in a low-velocity and low-torque operational state. The motor has a first rotor and a second rotor, each of which has a permanent magnet, and an output shaft capable of rotating integrally with the first rotor. The second rotor can relatively rotate with respect to the first rotor by a driving force from a phase difference changing driving device, and the phase difference between the rotors (rotor phase difference) can be changed by the relative rotation of the second rotor with respect to the first rotor. When the values of the torque and the rotational velocity of the motor lie within a predetermined region in the proximity of 0, the phase difference changing driving device adjusts the rotor phase difference to a predetermined phase difference for which the strength of a composite field of the permanent magnets is lower than a maximum strength.

A method of forming an electron emitter includes the steps of: (i) forming a nanostructure-containing material; (ii) forming a mixture of nanostructure-containing material and a matrix material; (iii) depositing a layer of the mixture onto at least a portion of at least one surface of a substrate by electrophoretic deposition; (iv) sintering or melting the layer thereby forming a composite; and (v) electrochemically etching the composite to remove matrix material from a surface thereof, thereby exposing nanostructure-containing material.

The invention discloses an electronic device electromagnetic environmental effect test system and test method under an electromagnetic pulse compound field environment. A tested electronic device is fixed to a tested posture control table and placed in a uniform field test area, the tested electronic device is set to a certain working state by using an electronic device working state controller, and the tested posture control table is adjusted, a magnetic field control circuit and an electronic field control circuit are controlled to set a magnetic field amplitude value and an electronic fieldamplitude value, a magnetic field generator and an electronic field generator are subjected to linkage and trigger, and a compound field is formed to perform an irradiation effect test. The magneticfield amplitude value, the electronic field amplitude value and delaying time are continuously changed from low to high, responding phenomenon and responding signals of the tested electronic device under different interference source parameters are recorded, and effect laws are analyzed. The electronic device electromagnetic environmental effect test system and test method under the electromagnetic pulse compound field environment ensure standardization and rationality of the electromagnetic environmental effect test of the electronic device, improve accuracy of the electromagnetic environmental effect test of the electronic device, and are suitable for carrying out relative research work of an electromagnetic pulse compound field environmental effect test of a ground nuclear explosion source area.

In a method and apparatus for adjusting a composite electric field to be applied to an ion trap to accommodate switching the operation of the ion trap between a positive ion mode and a negative ion mode, the composite electric field includes a plurality of component fields including at least one AC trapping field and one or more supplemental AC fields. A phase of one or more of the component fields is adjusted such that a force imparted by the composite field to a negative ion in the ion trap will be substantially the same as the force imparted by the composite field to a positive ion in the ion trap.

The invention discloses a light alloy electromagnetic ultrasonic casting and rolling integration device and method, belonging to the field of metal material preparation technology. According to the invention, the continuous casting technology of a slab is combined with the hot rolling continuous deformation technology, and an electromagnetic/ultrasonic composite field is introduced into a continuous casting crystallizer to provide a light alloy sheet preparation device and method with short flow and high efficiency. The working principle of the electromagnetic ultrasonic casting and rolling integration device is that: the smelted metal liquid is poured into the crystallizer through an immersive spure, and cooled and solidified by the crystallizer to form a blank shell with a certain thickness; the outer part and upper part of the crystallizer are provided with an induction coil and an ultrasonic generator respectively so as to generate an electromagnetic/ultrasonic composite outer field, improve the surface and internal quality of the casting blank and enhance the plastic deformation capability of the casting blank; the high-quality continuous casting slab is directly subjected to hot rolling deformation; and under the effect of multiple rows of rolls at adjustable gaps and close to the crystallizer, the casting blank generates continuous plastic deformation, the thickness is gradually reduced, and the slab of a light alloy is obtained.

The invention discloses a multi-physics field-assisted electric resistance welding method for dissimilar metal material. The multi-physics field-assisted electric resistance welding method for the dissimilar metal material includes steps that exerting a magnetic-sound composite field to a piece to be welded after performing oil removing and acid pickling so as to activate the surface of the piece to be welded, carrying out electric resistance welding on the dissimilar metal under the magnetic-sound composite field environment till solidifying the metal at the weld joint, cooling to a room temperature, and stopping exerting the composite field to finish welding the dissimilar metal. The multi-physics field-assisted electric resistance welding method for the dissimilar metal material has advantages that by means of the stirring and shock excitation effects of the magnetic-sound composite field for the melt metal at the weld joint in the welding process, the primary crystal size is effectively reduced, the dislocation density in the crystal is increased, the size of the crystal grain tissue at the weld joint is refined, and the mechanical performance of the weld joint is improved; by means of the magnetic field and high-frequency vibration, the energy generated by elastic vibration is converted into the plastic flow energy of the metal material, the friction power of the welding interface and heat energy, the energy needed for melting base metal for the electric resistance welding can be lowered, and the energy is saved.

The invention discloses a dimension modeling method, a dimension modeling apparatus, a device and a storage medium. The method comprises the following steps: according to service needs, constructing alogic model of a fact table and a dimension table; according to the logic model, constructing a physical model of the fact table and the dimension table, wherein specified dimension data is denormalized to the fact table through a set composite field when the physical model of the fact table is constructed. According to the method, the apparatus, the device and the storage medium provided by theinvention, the dimension data is denormalized to the fact table, which is convenient for directly inquiring the fact table without performing associated inquiry while performing data inquiry. Moreover, when the dimension data is denormalized to the fact table, storage and recording are executed according to the set composite field, thus, field expansion caused after redundancy is avoided.

The invention discloses a linear nanometer carbon pipe composite field launching source and making method and specific device, which contains a conductive fiber weaving line substrate with single wall or multiple-wall nanometer carbon pipe film deposited on the substrate. The making method comprises the following steps: predisposing the surface of fiber weaving line; utilizing self-power pyrolytic CVD method grow single-wall or multiple-wall nanometer carbon pipe on the fiber weaving fiber. The length of composite field launching source is not limited, which produces linear pattern product. The device is fit for pipe-typed nanometer carbon pipe field launching luminous bulb, which can observe the field emitting condition.

A method for controlling Angelica sinensis root-knot nematode by marigold interplanting belongs to the field of controlling damage by plant parasitic nematodes, and particularly relates to a method for controlling Angelica sinensis root-knot nematode by changing the Angelica sinensis cropping system. The method includes the steps: transplanting marigold to two sides of each ridge (having a bed width of 1.7m) with a plant spacing of 30cm twenty days before Angelica sinensis transplanting; and when 20 days are past, transplanting four plants of Angelica sinensis per row of marigold with a plant spacing of 28cm, and allowing each row of Angelica sinensis to be spaced from marigold by 35cm so as to form 2:4 interplanting of marigold and Angelica sinensis (see attached figures). Compared with single culture of Angelica sinensis, the method can be more effective in root-knot nematode control by more than 75% and also has a composite field increasing effect for both Angelica sinensis and marigold, and land utilization rate is increased by 70%.

The present invention provides a method of multi-walled carbon nantubes using polymer as raw material, belonging to inorganic function material synthesizing technology field, in particular: polyethylene or polypropylene, PEMA or polypropylene and catalyst are placed in the sealing container according to a certain proportion, calculated by weight percentage, polyethylene or polypropylene : PEMA or polypropylene : catalyst is 1:0.25-0.5:0.05-0.005; baking 10-25 hour under the temperature 600-850 Celsius, cooling to room temperature, removing reactant, acid washing to remove catalyst, the product is obtained by drying. The invention has a simple operation, high productive rate, lower cost, and is a green method for acquiring carbon nantubes, the multi-walled carbon nantubes have wide application, used as hydrogen storage material, high strength composite field, catalyst carrier etc.

The invention discloses a groove-insulated gate type gate-drain composite source field plate power device and a fabrication method thereof. The device comprises, from bottom to top, a substrate (1), a transition layer (2), a barrier layer (3), a source electrode (4), a drain electrode (5), an insulation medium layer (7), an insulated groove gate (8), a passivation layer (9), a gate field plate (10), a drain field plate (12) and a protection layer (13); the drain field plate (12) is electrically connected with the drain electrode (5), and the gate field plate (10) is electrically connected with the insulated groove gate (8), wherein, a groove (6) is opened on the barrier layer; and n floating field plates (11) are deposited on the passivation layer arranged between the gate field plate and the drain field plate. All the floating field plates have the same size and are mutually independent, and the floating field plates are equidistantly distributed between the gate field plate and the drain field plate. The n floating field plates, the gate field plate and the drain field plate are completed on the passivation layer by one-time process. The power device has the advantages of simple process, strong reliability and high output power, and the power device and the fabrication method can be used for fabricating high power devices.