62 results about "Magnetic field" patented technology

A noncontact power feed system includes: a noncontact power feed apparatus including a power feed resonance device to supply alternate-current power to an electronic apparatus by resonance in a noncontact manner, and an alternate-current power source section to generate the alternate-current power and supply it to the power feed resonance device; a noncontact relay apparatus including a relay resonance device to receive the alternate-current power and relay it to another electronic apparatus by resonance in a noncontact manner, a relay-side rectifier circuit to form direct-current power for output, and a movement means for moving the noncontact relay apparatus by the direct-current power; and at least one noncontact power reception apparatus including a power reception resonance device to receive the alternate-current power by magnetic field resonance in a noncontact manner, a power-reception-side rectifier circuit to form direct-current power for output, and a load means driven by the direct-current power.

A method of obtaining information about the position and / or orientation of a magnetic component relatively to a magnetometric detector, the magnetic component and the magnetometric detector being moveable independently from each other relatively to a static secondary magnetic field, the method comprising the steps of: measuring in the presence of the combination of both the magnetic field of the magnetic component and the static secondary magnetic field essentially simultaneously the strength and / or orientation of a magnetic field at at least a first position and a second position spatially associated with the magnetometric detector, the second position being distanced from the first position; and combining the results of the measurements to computationally eliminate the effect of the secondary magnetic field and derive the information about the position and / or orientation of the magnetic component.

The invention relates to a method and a device for preparing iron nitride material by double promotion of nanocrystallization and a strong magnetic field. An electrical heating body and a water cooling sleeve are sequentially arranged outside the inner stainless steel wall of the device, and a magnetic field generating device is arranged outside the water cooling sleeve. The method for preparing iron nitride comprises the following steps: firstly, preparing pure nanometer iron powder or pure nanometer iron films; putting the iron powder or the iron films into the device; leading in hydrogen gas; preserving heat for 10-90 minutes at 300-450 DEG C; naturally cooling to 60-100 DEG C, applying a magnetic filed of 6-20 T by the magnetic field generating device at the temperature, and leading in ammonia gas at the same time; raising the temperature in a reactor to 120-250 DEG C and preserving for 8-30 hours; and naturally cooling to room temperature. In the invention, nitridation reaction can be carried out in the condition of low temperature, which is beneficial to the formation of alfa''-Fe16N2 and the inhibition of the generation of other iron nitride substances. The content of the prepared iron nitride material alfa''-Fe16N2 reaches 65-99 percent.

The invention discloses a device and a method for detecting debonding defects of a carbon fiber composite material. The device comprises a stimulating component and a plurality of detecting components, wherein the stimulating component is used for generating a stimulating magnetic field and comprises a cuboid magnetic core and an exciting coil winding the cuboid magnetic core; the detecting components are used for detecting induced magnetic fields influenced by a disturbed magnetic field and are uniformly arrayed below the stimulating component, the arraying direction of the detecting component is parallel with long sides of the cuboid magnetic core, and the detecting components are distributed opposite to the stimulating component; and a detecting coil is located between the exciting coil and a to-be-detected carbon fiber composite material during the detection. According to the detecting device and method provided by the invention, the rapid and real-time local detection can be realized, and furthermore, the detection range is not influenced by the space size of the detecting device.

The invention discloses ferroferric oxide magnetic nanometer particles decorated with tetraazacalix [2] arene [2] triazine. A preparation method of the ferroferric oxide magnetic nanometer particles comprises the following steps of: firstly, covering a silicon shell by using the ferroferric oxide magnetic nanometer particles; decorating with amino to obtain amino-modified ferroferric oxide magnetic nanometer particles; and reacting the ferroferric oxide magnetic nanometer particles with the tetraazacalix [2] arene [2] triazine at 110 DEG C under a nitrogen condition to prepare the ferroferric oxide magnetic nanometer particles decorated with tetraazacalix [2] arene [2] triazine. The ferroferric oxide magnetic nanometer particles integrate the advantages of large superficial area of the original and easiness of separation of the original ferroferric oxide magnetic nanometer particles, and also have a new function characteristic, so that the extraction selectivity of a characteristic target is enhanced; and the ferroferric oxide magnetic nanometer particles are used for extracting and separating, and have the advantages of easiness and convenience in operation, and capability of extracting, enriching and separating organic matters and inorganic cations. And moreover, the ferroferric oxide magnetic nanometer particles can be totally separated from a base solution under an external magnetic field function, so that the ferroferric oxide magnetic nanometer particles are economic, environment-friendly and high in recovery rate and have a good popularization and application prospect.

The invention provides a simple pendulum comprising a simple pendulum support, a pendulum rope and a pendulum ball. The simple pendulum also comprises a laser pointer and an electronic stopwatch. Thelaser beams sent out by the laser pointer are used as control signals. The case of the electronic stopwatch is provided with light receiving holes and the electronic stopwatch is provided with a photoelectric gate circuit capable of controlling stopwatch timing. The laser pointer is fixed at one end of a U-shaped support and the electronic stopwatch over against the laser beams sent out by the laser pointer is fixed at the other end of the U-shaped support. A device capable of generating the magnetic field is arranged below the equilibrium position of the simple pendulum. At the fixed point ofthe pendulum rope on the simple pendulum support, a protractor is arranged on a plane parallel with the plane of motion of the pendulum ball. The zero graduation line of the protractor and the plumbline coincide, and then the graduation lines of 1-90 degrees are marked symmetrically at the left and right sides of the protractor.

The invention relates to a three-dimensional electromagnetic slow diffusion numerical simulation method based on super-convergence interpolation approximation. The method comprises: after a complex conductivity model is introduced into a frequency domain Maxwell equation set, an electromagnetic field diffusion equation containing a negative fractional power term of a complex frequency variable, and performing frequency-time conversion to obtain a time domain control equation containing a Caputo fractional order differential term; performing super-convergence approximation on a Caputo fractional derivative in the electric field control equation by adopting an Alikhanov super-convergence interpolation approximation method to obtain a non-uniform step size discrete approximate expression of afractional order differential item, thereby finishing stable and high-precision direct solution of the time domain fractional order differential item; and finally, discretizing the control equation based on a finite difference algorithm, deriving an electric field and magnetic field iterative equation, and finally realizing high-precision numerical simulation of three-dimensional time domain electromagnetic slow diffusion. The invention aims to solve the problems of weak singular instability and large error of fractional differential solution and realize high-precision numerical simulation ofthree-dimensional time domain electromagnetic slow diffusion.

The invention discloses a nano multi-layer composite solid lubricating film layer with a long service life under space irradiation and preparation thereof. The nano multi-layer composite solid lubricating film layer composed of a Ti binding layer, a TiN bearing layer and an AgTiNi / MoS2Ti nano multi-layer lubricating functional layer is deposited on a titanium alloy substrate, an aluminum alloy substrate, a stainless steel substrate, a bearing steel substrate and the like by adopting a closed magnetic field unbalanced magnetron sputtering technology. The nano multi-layer composite film layer can reliably serve for a long time in strong space irradiation environments such as low-orbit high atomic oxygen density, medium-high-orbit high electron proton density and high ultraviolet irradiation dose, and is high in bearing capacity and low in friction coefficient, thus, the service life of a moving part of a spacecraft exposed in the space irradiation environments can be greatly prolonged, and the reliability of the moving part is improved. In addition, the preparation method has the characteristics that the process is environment-friendly and flexible, the film thickness is uniform, the compactness is good, the preparation process of the film layer is controlled in a programmed manner, the modulation period of the film layer is easy to regulate and control, and batch treatment can be realized, industrial production is easy to realize, and the good application prospect is achieved.

The invention provides a mixed sensor. The mixed sensor is composed of a superconducting ring and a superconducting gradient coil. The superconducting ring is a square loop (7) with a retracting part (8); the superconducting ring is composed of the square loop (7) and the retracting part (8); the retracting part (8) is located at one edge of the square loop (7); the retracting part (8) and other three edges of the square loop (7) are located on the same plane; and one edge of the square loop with the retracting part is connected with the other three edges to form the superconducting ring. The superconducting ring is vertically arranged in a magnetic field to be detected; and the superconducting gradient coil is parallel to the retracting part of the superconducting ring and is distributed at one side of the retracting part of the superconducting ring. The superconducting gradient coil is composed of a receiving coil and a compensation coil which are located on the same plane. Each turn of coil of the receiving coil and the compensation coil is wound in the same direction; winding directions of the receiving coil and the compensation coil are opposite; the receiving coil and the compensation coil have the equal diameter and equal number of turns; and the receiving coil and the compensation coil are connected through double stranded wires.

First and second magnetic detection units are disposed at positions where an S / N ratio, which is a ratio between the strength of a magnetic field generated by a current to be measured flowing through a current path and the strength of an external magnetic field, is the same. A processing unit determines a normal operation state in a case where the detection signal of the first magnetic detection unit and the detection signal of the second magnetic detection unit approximately match each other. The processing unit determines that either one of the first and second magnetic detection units has failed in a case where the detection signals do not match each other.