44results about How to "Enhance the strength of the electromagnetic field" patented technology

Disclosed is a momentum wheel based on a moving coil motor. The momentum wheel based on the moving coil motor is characterized in that a cavity is formed between an upper cover of a housing and a center support pillar of a housing bottom seat, an inner ring of a rotation shaft is fixed on the periphery of the center support pillar of the housing bottom seat, located in the cavity, a rotor iron core with a coil wound around is fixed on an outer ring of the rotation shaft in the cavity, the rotor iron core and the coil form a rotor portion of the momentum wheel, stator portions of the motor, which are permanent magnets, are respectively fixed on the upper portions and the lower portions of the rotor iron core and the coil, the upper cover of the housing and the inner wall of the housing bottom seat, the magnetizing direction of each permanent magnet is along the vertical direction, and a slide ring is placed in the cavity between the rotor iron core and the housing bottom seat. During the running process of the momentum wheel based on the moving coil motor, single phase direct voltage is input into the momentum wheel, and therefore electric current running fluctuation in the coil is small; relative positions of rotors and stators can not influence a magnetic circuit, and therefore external circuits which monitor positions of the rotors in real time are not needed, and circuit complexity is reduced; whole permanent magnets are used as the stators, and therefore magnetic field intensity in a space where the coil is located is high, and large torque can still be provided under the circumstance that electric currents are small.

In a ferrite phase shifter, a temperature rise at ferrites can be suppressed to maintain the characteristics of the frites even when used at high power. Thus, the phase shifter can stably demonstrate high performance. The ferrite phase shifter includes a rectangular waveguide, substantially sheet-like ferrites disposed to face each other with respective mounting surfaces kept in tight contact with inner walls of wide surfaces of the rectangular waveguide facing each other, and a coil which is wound around the periphery of the rectangular waveguide in a position substantially corresponding to the position of the ferrites and through which a current is passed.

The invention discloses a method for designing an antenna which can enlarge the reading range of a low frequency or high frequency RFID system. A plurality of pairs of space-separated reader antennas are connected through a multi-antenna search-read interface circuit. The method is characterized in that the coils of each pair of reader antenna are composed of a plurality of small coils connected in a manner of combining parallel connection with series connection; the current directions of adjacent edges of adjacent small coils are opposite; an impedance matching circuit is capacitive and resonates on the work frequency of the reader with inductive antenna coils. The small coils can be produced into shapes of a triangle, a rectangle, a square, a circle, an oval and a polygon, and a plurality of small coils match with the shape of the antennas after the combination of the parallel connection and the series connection according to the shapes of the areas the antenna needs to cover.

The invention discloses a noble metal ordered nanostructure array, a preparation method and application thereof. The array is composed of a gold-silver alloy nano-hexagonal prism array or a porous gold nano-hexagonal prism array. The end of the nano-hexagonal prism is provided with protrusions at the hexagons with a height ≤ 20nm, and the column structure period of the nano-hexagonal prism is 470-500nm. The column height of the nano-hexagonal prism is 50-200nm, the column wall of the nano-hexagonal prism is concave arc, and the column gap between adjacent nano-hexagonal prisms is 5-50nm; the method is to use the secondary anodic oxidation method to obtain a pore diameter of 160-380nm , the pore period is 470-500nm, and the hole is a through-hole alumina template with a hexagonal concave-convex structure array. The alumina template is applied with a pressure of ≤5.7×106N / m2 to obtain the target product. It can be used as an active substrate for surface-enhanced Raman scattering, and the content of rhodamine or methylparathion or PCB‑3 attached to it can be measured using a laser Raman spectrometer.

Disclosed is a momentum wheel based on a moving coil motor. The momentum wheel based on the moving coil motor is characterized in that a cavity is formed between an upper cover of a housing and a center support pillar of a housing bottom seat, an inner ring of a rotation shaft is fixed on the periphery of the center support pillar of the housing bottom seat, located in the cavity, a rotor iron core with a coil wound around is fixed on an outer ring of the rotation shaft in the cavity, the rotor iron core and the coil form a rotor portion of the momentum wheel, stator portions of the motor, which are permanent magnets, are respectively fixed on the upper portions and the lower portions of the rotor iron core and the coil, the upper cover of the housing and the inner wall of the housing bottom seat, the magnetizing direction of each permanent magnet is along the vertical direction, and a slide ring is placed in the cavity between the rotor iron core and the housing bottom seat. During the running process of the momentum wheel based on the moving coil motor, single phase direct voltage is input into the momentum wheel, and therefore electric current running fluctuation in the coil is small; relative positions of rotors and stators can not influence a magnetic circuit, and therefore external circuits which monitor positions of the rotors in real time are not needed, and circuit complexity is reduced; whole permanent magnets are used as the stators, and therefore magnetic field intensity in a space where the coil is located is high, and large torque can still be provided under the circumstance that electric currents are small.

The invention discloses a single-side heating multi-slit hemostatic needle. The single-side heating multi-slit hemostatic needle comprises a multi-slit electromagnetic main radiator and an insulating dielectric body which are arranged coaxially; the insulating dielectric body is provided with a cavity matched with the multi-slit electromagnetic main radiator; the multi-slit electromagnetic main radiator is arranged in the cavity; the multi-slit electromagnetic main radiator comprises an inner conductor and an outer conductor; the inner conductor is arranged in the outer conductor; an insulating dielectric layer is filled between the inner conductor and the outer conductor; the outer conductor is provided with at least two annular slits; metal blocking plates are arranged on the slits; the metal blocking plates block a part of the slit 8; the metal blocking plates are arranged on the outer side of the insulating dielectric body. The single-side heating multi-slit hemostatic needle has the advantages of establishing a whole liver cutting tourniquet at once; significantly shortening the operation time and reducing the complexity of the operation; achieving single-side heating and ablation; producing no thermal effect on the retained side liver tissues at the same time when the side liver needs to be cut in complete ablation; and maximally avoiding indiscriminate harm of the electromagnetic waves to the normal liver cells needing to be retained.

The invention discloses a surface-enhanced Raman scattering base material for gas detection and a preparation method thereof. The base material includes a base layer, the base layer is an inorganic material base provided with a rough working surface, and the working surface is loaded with in-situ grown gold Nano-island structure, the present invention forms a unique metal nano-island structure by growing metal nanoparticles in situ on an inorganic substrate with a rough surface, by regulating the size of the metal nanoparticles to 30-250nm, and the spacing is arranged at 1-80nm , the metal nanoparticles interact with each other, which significantly enhances the local electromagnetic field intensity on the surface of the metal nanoparticles and effectively improves the Raman signal intensity of the object to be detected. In addition, the combination of the substrate material and the metal-organic framework film material further increases the material The specific surface area can effectively increase the gas adsorption capacity, so that the surface-enhanced Raman scattering substrate can be applied to the detection of markers in the exhaled gas of cancer patients.

The invention relates to an electrode used for a dye-sensitized solar cell and doped with nanogold and a manufacturing method thereof. The electrode comprises a substrate, wherein a titanium dioxide film evenly doped with nanogold particles is attached to the substrate, the lower layer of the electrode is of a flat panel structure, the upper layer of the electrode is provided with cycle-shaped gaps, conductive glass is evenly coated with titanium dioxide grout with nanogold particles and wrapped with silicon dioxide, and the electrode is obtained after sintering. Small polystyrene balls are evenly deposited on the electrode to form a cycle structure, a titanium dioxide precursor mixed with nanogold solutions is injected, polystyrene is removed through sintering, the titanium dioxide film of the cycle structure is obtained to form a double-layer electrode, ultimately, the electrode is soaked in two different kinds of dye for sensitization, and the dye solar cell double-dye-sensitization electrode doped with the nanogold and of a double-layer structure is obtained. The electrode is used in the dye-sensitized solar cell, the absorption rate of the cell for visible light can be substantially improved, and the photoelectric conversion efficiency of the cell is improved.