نتایج جستجو برای: cerium
تعداد نتایج: 3705 فیلتر نتایج به سال:
A novel flow injection method has been developed for the indirect determination of uranium by the on-line reduction and subsequent fluorimetric detection of cerium(III). A sample solution containing uranium(VI), prepared as a sulfuric acid solution, was injected into a sulfuric acid carrier solution and passed through a column packed with metal bismuth to reduce uranium(VI) to uranium(IV). The ...
Ca-doped cerium phosphate (CeCaPO(4)) has been newly developed and successfully used as catalyst support with superior ion-exchanged property and oxygen activation ability. Ru(3+) exchanged CeCaPO(4) is identified as an efficient catalyst for aerobic oxidation of alcohols with the highest TOF (∼408 h(-1)) reported so far on supported Ru catalysts.
40 Å thick cerium oxide films have been grown on Si 100 substrates via physical vapor deposition of cerium metal in an oxygen background. The films have been characterized for their composition and thermal properties upon deposition and under different annealing conditions via x-ray photoelectron spectroscopy and medium energy ion scattering MEIS and their morphology using atomic force microsco...
Cerium is a trusted computing architecture that protects a program’s execution from being tampered while the program is running. Cerium uses a physically tamperresistant CPU and a μ-kernel to protect programs from each other and from hardware attacks. The μ-kernel partitions programs into separate address spaces, and the CPU applies memory protection to ensure that programs can only use their o...
Molecular dynamics (MD) simulation was used to explore the liquid-solid (crystal) phase change of a ceria nanoparticle. The simulations reveal that the crystalline seed, which spontaneously evolves and nucleates crystallisation, is a liquid rather than a solid. Evidence supporting this concept includes: (a) only 3% of the total latent heat of solidification had been liberated after 25% of the n...
Thermo-physical processes in cerium nitrate precursor droplets injected into high temperature plasma
Available online 22 September 2008
High-pressure x-ray emission measurements are used to provide crucial evidence in the longstanding debate over the nature of the isostructural (α, γ) volume collapse in elemental cerium. Extended local atomic model calculations show that the satellite of the Lγ emission line offers direct access to the total angular momentum observable (J(2)). This satellite experiences a 30% steplike decrease ...
Ceria, zirconia and mixed cerium-zirconium mesoporous oxides were synthesized and 12 used as supports for sulfur and gold species. The materials were characterised using selected 13 advanced techniques (ICP-OES, elemental analysis, XPS, XRD, N2 adsorption and desorption 14 isotherms, UV-vis, ATR-FTIR, TPR-H2, TG-DTA) which allowed monitoring of the oxidation state 15 of metals (cerium and gold)...
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