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452 results about "Transmission properties" patented technology

Tungsten-doped boride-coated lithium battery anode material and preparation method thereof

The invention is applicable to the technical field of lithium batteries and provides a tungsten-doped boride-coated lithium battery anode material and a preparation method thereof. Firstly, tungsten source is dissolved in water, sprayed onto a mixed material of a ternary precursor and lithium source and then stirred to obtain a dried material; the dried material is placed and baked in a saggar toobtain a tungsten-doped ternary anode material; finally, metal boride is added to the tungsten-doped ternary anode material, stirred uniformly and sintered at a certain temperature to obtain the tungsten-doped boride-coated lithium battery anode material. According to the tungsten-doped boride-coated lithium battery anode material, the synergistic effect between tungsten doping and the metal boride takes full advantage of the tungsten doping and the metal boride, the tungsten doping can significantly inhibit grain growth and shorten the transmission distance of Li+, MgB2 as a superconductor has fast ion transmission properties, and the tungsten doping and the metal boride improve rate capability of the tungsten-doped boride-coated lithium battery anode material. Meanwhile, the boride coating can inhibit the reaction between the surface of an electrode material and electrolyte, thereby improving the safety performance and cycle stability of the tungsten-doped boride-coated lithium battery anode material.
Owner:GEM (HUBEI) NEW ENERGY MATERIALS CO LTD

Optimization design method of magnetic coupling resonant type wireless electric power transmission system

The invention relates to an optimization design method of a magnetic coupling resonant type wireless electric power transmission system. The method comprises the following steps: S10, erecting a magnetic coupling resonant type wireless electric power transmission system model; S11, establishing an equivalent circuit of the magnetic coupling resonant type wireless electric power transmission system; S12, introducing and calculating power supply matching factors S(M-2C) and S(M-4C), load matching factors L(M-2C) and L(M-4C), a transmission quality factor T(Q) and a frequency offset factor F(D); S13, deriving reflection impedance Z32 reflected to a transmitting coil by a receiving coil; S14, performing per unit processing on the reflection impedance Z32 to obtain reflection impedance Z32<-> after the per unit processing; S15, analyzing the transmission characteristics of the magnetic coupling resonant type wireless electric power transmission system through the Z32<->; S16, adjusting the parameters of the magnetic coupling resonant type wireless electric power transmission system according to the analysis result of the step S15; and S17, repeating the steps from the S12 to the S16 until the transmission characteristics reach target values.
Owner:TSINGHUA UNIV

Photo sensor for standardized color measurement

The invention is directed to a photosensor for color measurement based on three spectral components, particularly for highly accurate color measurement for testing and guaranteeing color constancy in engineered surfaces and consumer articles of any kind. The object of the invention, to find a novel possibility for color measurement based on a three-range method with color measurement values generated by preceding interference filters with different spectral responses which permits a virtually true-color measurement in conformity with standards in a simple manner without costly reference light calibration, is met according to the invention in that the photosensor comprises at least three partial surfaces which are covered by different interference filters adapted to the X-, Y- and Z-spectral characteristic of the human eye, each partial surface being arranged so as to be uniformly distributed in a sector-shaped manner and so as to cover the same area around a center with passivated webs located therebetween, and every partial surface is provided with an interference filter whose transmission characteristic over the wavelength of the light to be measured spectrally is adapted to the response of the human eye, wherein the spectral components passed by the interference filters approximate the normal spectral value functions of the human eye in color coordinates of the color space.
Owner:AMS SENSORS GERMANY GMBH
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