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 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.