J. H. Kim

Partially unzipped MWCNTs provide increased surface area and accessible inner pores with oxygen groups leading to high performance sulfur batteries.

We report measurements of branching fractions of τ lepton decays to final states with a K 0 S meson using a 669 fb -1 data sample accumulated with the Belle detector at the KEKB asymmetricenergy e + e -collider.The inclusive branching fraction is measured to be B(τ -→ K 0 S X -ντ ) = (9.15± 0.01 ± 0.15) × 10 -3 , where X -can be anything; the exclusive branching fractions are, where the first uncertainty is statistical and the second is systematic.For each mode, the accuracy is improved over that of pre-B-factory measurements by a factor ranging from five to ten.In τ -→ π -K 0 S K 0 S π 0 ντ decays, clear signals for the intermediate states τ -→ π -f1(1285)ντ and τ -→ K * -K 0 S π 0 ντ are observed.

We report a measurement of ${D}^{0}\text{\ensuremath{-}}{\overline{D}}^{0}$ mixing parameters and a search for indirect $CP$ violation through a time-dependent amplitude analysis of ${D}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays. The results are based on $921\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data accumulated with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Assuming $CP$ conservation, we measure the mixing parameters $x=(0.56\ifmmode\pm\else\textpm\fi{}{0.19}_{\ensuremath{-}0.09\ensuremath{-}0.09}^{+0.03+0.06})%$ and $y=(0.30\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}{0.15}_{\ensuremath{-}0.05\ensuremath{-}0.06}^{+0.04+0.03})%$, where the errors are statistical, experimental systematic, and systematic due to the amplitude model, respectively. With $CP$ violation allowed, the parameters $|q/p|={0.90}_{\ensuremath{-}0.15\ensuremath{-}0.04\ensuremath{-}0.05}^{+0.16+0.05+0.06}$ and $\mathrm{arg}(q/p)=(\ensuremath{-}6\ifmmode\pm\else\textpm\fi{}11\ifmmode\pm\else\textpm\fi{}{3}_{\ensuremath{-}4}^{+3})\ifmmode^\circ\else\textdegree\fi{}$ are found to be consistent with conservation of $CP$ symmetry in mixing and in the interference between mixing and decay, respectively.

MnOx nanoparticles were synthesized by spray pyrolysis, with and without citric acid assistance. The prepared MnOx particles were calcined between 600 and 1000°C and characterized by Brunauer-Emmett-Teller, X-ray diffraction, scanning electron microscopy, and temperature-programmed reduction. The use of citric acid made it possible to reduce the particle size and increase the surface area of the MnOx particles. The highest surface area and reduction activity were achieved with citric acid. As a result, the MnOx nanoparticles prepared with citric acid and calcined at 600°C showed the highest catalytic activity for the oxidation of benzene using ozone.

An efficient Dy 3+ -doped ZBLAN fiber laser core-pumped at 1100 nm is experimentally demonstrated with AlF3 no-core fiber end-caps for better heat conduction. The maximum output power and slope efficiency were 607 mW and 25%, respectively.