729results about How to "Improve dispersion" patented technology

Disclosed is a semiconductor laser spectral beam combining device for for realizing spectral width compression through two-time diffraction by using a grating and a reflecting element. The device comprises a semiconductor laser light source, a slow axis collimating cylindrical lens, a transforming lens, a grating, a reflecting element and an output coupling mirror. In the invention, the single grating is used as a diffraction element, the reflecting element reflects the beam which is diffracted by the grating for the first time, the beam is secondarily dispersed when passing through the grating again, and the dispersive power is doubled. Through the feedback of the output coupling mirror, the laser of each unit of a semiconductor laser array is locked at a different wavelength to obtain a laser output of high power and high brightness. The device of the invention overcomes the limitation of the gain line width of a gain material in the traditional spectral beam combination to the number of beam combining units, can increase the number of beam combining units within the gain line width and the high-efficiency diffraction wavelength range of the grating, increases the output power significantly, reduces the resonant cavity length with a certain spectral width, makes the laser structure compact and improves laser mode stability.

The invention discloses an EPDM (ethylene propylene diene monomer) rubber insulated / jacketed cable with high strength, oil resistance and aging resistance. The EPDM rubber insulated / jacketed cable comprises following raw materials: EPDM rubber, nitrile butadiene rubber, maleic anhydride grafted polypropylene, an ethylene-vinyl acetate copolymer, diphenyl hexadiphthalein diamine, stearic acid, zinc oxide, superfine fully vulcanized powder nitrile butadiene rubber, tin(II) chloride dehydrate, bromo-octyl-phenolic curing resin, calcined kaolin, zinc methacrylate, carbon nano tubes, superfine silica, calcium sulfate whiskers, polyacrylonitrile fibers, a silane coupling agent, lanthanum glutamic dithiocarbamate, petroleum wax, naphthenic oil, an anti-aging agent and an accelerator. The EPDM rubber insulated / jacketed cable material with high strength, oil resistance and aging resistance serves as insulation and / or a jacket in a cable and has high strength, good oil resistance, aging resistance and combination properties and long service life.

Color concentrates for thermoplastic biofiber composites are disclosed. The concentrates employ three factors to achieve concentrated delivery of color to the processing machine and excellent and substantially uniform dispersion of color in the processing machine: melt flow of the concentrate exceeding at least 4 g / 10 min. using ASTM D-1238; pellet size of the concentrate such that at least 50 pellets weigh less than one gram; and weight percent of the colorant ingredients in the concentrate exceeding at least 30 weight percent.

The invention relates to a low-attenuation single-mode optical fiber. The low-attenuation single-mode optical fiber comprises a fiber core layer and cladding layers. The low-attenuation single-mode optical fiber is characterized in that a first inner cladding layer and a second inner cladding layer sequentially coat the fiber core layer; the radius R1 of the fiber core layer is 3.5 to 5 mu m, and the relative refractive index difference is 0.2 percent to 0.4 percent; the radius R2 of the first inner cladding layer is 6.5 to 11 mu m, and the relative refractive index difference is -0.06 percent to 0 percent; the radius R3 of the second inner cladding layer is 15 to 30 mu m, and the relative refractive index difference is -0.02 percent to 0.05 percent; the outermost layer is an outer cladding layer; and the outer cladding layer is a pure silica quartz glass layer. By the adoption of a double-inner-cladding-layer structure, the refractive index section of the optical fiber is designed more reasonably. By optimizing doping agents of the fiber core layer and the cladding layers, the material viscosity of the fiber core layer is reduced, the viscosities of the fiber core layer and the cladding layers can be matched, and the increase of optical fiber attenuation caused by stress concentration in a fiber corer part due to drawing tension is effectively avoided. On the basis of comprehensive compatibility with a G.652 standard, the attenuation performance of the optical fiber is much higher than that of a conventional G.652 optical fiber.

The invention relates to a lithium ion battery silicon carbon composite negative electrode material and a preparation method thereof. The method comprises the following steps: fixing nanometer silicon in a macromolecule microsphere by preparing a micromolecule / silicon / (carbon black) composite microsphere emulsion, then compounding the microsphere emulsion and graphite, asphalt and the like, and carrying out thermal treatment, thereby obtaining the lithium ion battery silicon carbon composite negative electrode material. The macromolecule microsphere in the material has the effects that the macromolecule microsphere not only is a fixer for stabilizing and inlaying the nanometer silicon, but also is a bonding agent between the nanometer silicon and the graphite after being subjected to high-temperature sintering treatment. The method solves the problems that the nanometer silicon is high in specific surface energy and easy to agglomerate because of small granularity. The lithium ion battery silicon carbon composite negative electrode material prepared by the preparation method disclosed by the invention achieves the synergistic effect of graphite, high-dispersion silicon and carbon, and presents an excellent battery performance.