257 results about "Lanthanoid Series Elements" patented technology

A light emitting apparatus has a light emitting element with an emission wavelength in the range of 360 to 550 nm and a rare-earth element doped oxide nitride phosphor or cerium ion doped lanthanum silicon nitride phosphor. Part of light radiated from the light emitting element is wavelength-converted by the phosphor. The light emitting apparatus radiates white light generated by a mixture of the wavelength-converted light and the other part of light radiated from the light emitting element.

The invention provides a lead-free cutting-free alloy and a preparation method thereof. The components (weight percentage) of the alloy are: more than 97.0 but not equal to 99.5 of (copper + zinc), more than 35.0 of zinc, 0.4-1.6 of phosphor and 0.005-0.6 of at least two other elements selected from aluminum, silicon, antimony, stannum, lanthanon, titanium and boron, the balance being zinc and impurities, wherein, the zinc content is more than 35.0 (weight percentage). The invention also provides a preparation method for the lead-free cutting-free high phosphor brass alloy. The alloy of the invention has excellent machinability, castibility, welding property, dezincification corrosion resisting property, formability and mechanical property, and is particularly suitable for forged pieces and low-pressure cast castings needing cutting processing, grinding processing (polish), welding and plating, such as hydrants, valve bodies and bushings in a water supply system.

The invention discloses a nitrogen-containing rare-earth magnetic powder prepared by taking ferrocene, cyclopentadienyl lanthanide, metallic iron and rare earth as the main raw materials. The nitrogen-containing rare-earth magnetic powder comprises the following component of R2Fe17-xMxNy, wherein the R is one or more kinds of 17 kinds of rare earth elements including Sc and Y, the M includes transitional elements except for Fe and is one or more kinds of Al, Ga, In, Si, Ge, Sn, Pb, Mg and Ca, the x is equal to 0 to 5, and the y is equal to 1 to 6; and the preparation method comprises the following steps: working procedure of preparation of the R2Fe17-xMx compound powder; working procedure of nitridation; and working procedure of magnetic powder refining and nitriding.

A field effect transistor including a semiconductor layer including a composite oxide which contains In, Zn, and one or more elements X selected from the group consisting of Zr, Hf, Ge, Si, Ti, Mn, W, Mo, V, Cu, Ni, Co, Fe, Cr, Nb, Al, B, Sc, Y and lanthanoids in the following atomic ratios (1) to (3):In / (In+Zn)=0.2 to 0.8  (1)In / (In+X)=0.29 to 0.99  (2)Zn / (X+Zn)=0.29 to 0.99  (3).

The invention discloses a heat-reflecting heat-insulation inorganic composite material as well a preparation method and an application thereof. The heat-reflecting heat-insulation inorganic composite material is a micron / nano composite material which takes alumina, titanium oxide and silicon oxide as substrates and is doped with one or a plurality of rare-earth elements such as yttrium, cerium and lanthanum. The inorganic composite material prepared by using a liquid phase method, a liquid phase coating method and a solid phase mixing method can be used for preparing a heat-reflecting thermal-insulation heat-insulation coating. The heat-reflecting heat-insulation inorganic composite material has the beneficial effects that 1) the reflectivity of the heat-reflecting heat-insulation inorganic composite material on a heat ray can be above 90%, the thermal radiation of sun and thermal radiation of other thermal radiation sources can be effectively prevented, ultraviolet ray can be absorbed, and the heat-reflecting heat-insulation inorganic composite material has an ultraviolet ray harm resistant function; 2) the heat-reflecting heat-insulation inorganic composite material is an inorganic solid material which does not contain an organic solvent and has the beneficial effects that is the material is safe and non-toxic, has stable chemical property and stable heat reflecting thermal insulation performance, is easy to store for a long term, and the like; and 3) the preparation technology is simple and easy to operate, the raw material is easy to obtain and cheap, the reaction process is almost free from industrial three wastes, thus the preparation technology has the characteristics of green production and environment-friendly application and is suitable for industrial production.

The present invention provides a modified conjugated diene polymer that is prepared by polymerization of a conjugated diene compound using a catalyst containing a lanthanoid rare earth element compound in an organic solvent and then modifying the resulting polymer having an active organic metal site with a modifier, wherein the modification efficiency is not less than 15% and the cis-1,4 bond content in the conjugated diene moiety measured by Fourier transform infrared spectroscopy satisfies the relationship (I):cis-1,4 bond content≧98.00(%)  (I),or the modification efficiency is not less than 75% and the cis-1,4 bond content in the conjugated diene moiety measured by Fourier transform infrared spectroscopy satisfies the relationship (II):94.00(%)≦cis-1,4 bond content<98.00(%)  (II).The invention further provides a rubber composition containing the modified conjugated diene polymer and giving a tire exhibiting low heat build-up, satisfactory failure characteristics, and high abrasion resistance, and a tire composed of the rubber composition and exhibiting these characteristics.

The invention discloses a method for improving the denitrification efficiency of a biological membrane packed tower for simultaneously removing sulfur and nitrogen from smoke by externally adding a rare earth enhancer. The method comprises the steps of adding the mixture of low-concentration rare earth elements include lanthanum (La) and cerium (Ce) into circulating liquid of a circulating liquid storage tank of a biological membrane packed tower system to be as a biological activity enhancer, uniformly mixing, spraying the biological activity enhancer to a biological membrane in the tower along with the circulating liquid to stimulate and improve the adaptability of denitriding flora in a microbial flora based on autotrophic bacteria to a low-pH strong-acidity growing environment condition, so as to accelerate the rapid growth and reproduction of the microbial flora, thus achieving the effect of improving the denitrification efficiency of the biological membrane packed tower for simultaneously removing the sulfur and nitrogen of the smoke. According to an experiment, the rare earth enhancer including 0.25mg / L lanthanum nitrate and 0.25mg / L of cerous nitrate in the additive concentration ratio is screened out. Due to the application of the technical method disclosed by the invention, the NOx removal efficiency of the biological membrane packed tower is improved by 20.6% and 13.9% respectively, and an application effect of a simultaneous smoke desulfurization and denitrification technique by virtue of a biological method is remarkably improved.

The invention provides preparation methods of a multi-rare earth co-doped boride and nano thermal insulation powder thereof and an application of the nano heat insulation powder. The chemical formulais R<x>R'<1-x>B6, wherein R and R' are different rare earth elements, B is boron element, x is greater than 0 and less than 1, and R and R' are selected from two of praseodymium, dysprosium, lanthanum, cerium, rubidium, ytterbium, europium, gadolinium or yttrium. According to the multi-rare-earth co-doped boride, due to doping of multiple rare earth, spectral absorption waves of the material are subjected to red shift, a better heat insulation effect is achieved; and the preparation method adopts a microwave solid phase method, so that the powder granularity is smaller and can reach hundred nanometers or below.