[en] The recent CLEO-c results on hadronic decays of D and D_s mesons are presented. First the absolute branching fractions for D and D_s mesons using a double tag technique are discussed, then are the Cabibbo suppressed decays and doubly Cabibbo suppressed decays. Finally, I present the inclusive and rare decay modes and other measurements from CLEO-c. These decays illuminate a wide range of physics. A brief theoretical introduction is given before the corresponding discussion on measurement.

[en] We report on three LYSO crystal batches characterized at the Caltech crystal laboratory for future HEP experiments: 25 20 cm long crystals for the SuperB experiment; 12 13 cm long crystals for the Mu2e experiment and 623 14×14×1.5 mm"3 plates with five holes for a LYSO/W Shashlik matrix for a beam test at Fermilab. Optical and scintillation properties measured are longitudinal transmittance, light output and FWHM energy resolution. Correlations between these properties are also investigated

[en] Detection technology of fuel component surface uranium contamination is studied, the main principle of detection of surface contamination is analyzed andadetection system is established. Through the analysis on the experimental data of surface alpha standard test, the measurement uncertainty of the detection system has been obtained; the testing results show that: the alpha-counting method for detecting fuel element surface uranium contamination is stable and reliable, and the device has the advantages of high sensitivity, short measurement time, and simple operation. This method can satisfy the requirements for actual fuel component surface uranium contamination measurement. (authors)

[en] This work demonstrates a novel organic conversion coating treatment on an AA2024-T3 substrate. The process is based on simple immersion in aqueous solutions containing an organic molecule, N-Benzoyl-N-phenylhydroxylamine (BPHA), after a hydrothermal oxide has been formed on the alloy surface. Potentiodynamic polarization results indicate that BPHA conversion coating outperforms coatings formed in the same concentration of other corrosion inhibitors, including NaVO₃, Na₂SiO₃, CeCl₃, and benzotriazole. BPHA coating also displays strong and persistent corrosion inhibition under ASTM B117 salt spray exposure conditions and static immersion testing. The cross-section of BPHA-coated substrate is prepared by focus ion beam-scanning (FIB), and analyzed by high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) coupled with energy dispersive spectroscopy (EDS), which show a thick surface film with a three-layer structure. Raman spectroscopy and XPS are used to examine the surface chemistry of BPHA-coated samples, both of which suggest the formation of a BPHA surface film, possibly stabilized by the keto-to-iminol conversion that made the BPHA molecule strongly nucleophilic. The formation of BPHA-metal oxide complex seems to be closely related to the excellent corrosion resistance of BPHA coating.

[en] Based on the different field source theory of transient electromagnetic method, the transient electromagnetic response expression of electric dipole is given, and the transient electromagnetic response of long-line source and loop line source is calculated by the superposition principle of electromagnetic field. Based on the definition of the whole area apparent resistivity, the apparent resistivity of the three-layer model was calculated by the binary search, and the apparent resistivity curve was plotted. By comparing the apparent resistivity curves of different models, the resolution limits of transient electromagnetic methods for low-resistance thin layers under different conditions are analysed and discussed. The identification and resolution of low-resistance thin layers by transient electromagnetic method are summarized. Transient electromagnetic working devices are of great significance. (paper)

[en] Porous AgBr@Ag and AgBrI@Ag plasmonic photocatalysts were synthesized by a multistep route, including a dealloying method to prepare porous Ag, a transformation from Ag to AgBr and AgBrI, and a photo-reduction process to form Ag nanoparticles on the surface of AgBr and AgBrI. It was found that the porous structure kept unchanged during Ag was transferred into AgBr, AgBrI, AgBr@Ag, and AgBrI@Ag. Both porous AgBr@Ag and porous AgBrI@Ag showed much higher visible-light photocatalytic activity than cubic AgBr@Ag for the degradation of methyl orange, which is because the interconnected pore channels not only provide more reactive sites but also favor the transportation of photo-generated electrons and holes. For AgBrI@Ag, AgBrI solid solution formed at the interface of AgBr and AgI, and the phase junction can effectively separate the photo-generated electrons and holes, favorable to the improvement of photocatalytic activity. The optimal I content for obtaining the highest activity is ∼10 at.%.

[en] The models of Wistar big mice under X ray irradiation were copied and intervened by the compound prescription powder made from rana japonica oil, for the purpose to examines the ability of suppression on the hydroxy free radicals in the serum taken from each group of big mice which was being examined. Results show that the ability of prevention group of suppression hydroxy free radical is obviously higher than blank control group and tailored radiation group (p<0.05). Ability of treatment group suppress hydroxy free radically is obviously higher than tailored radiation group (p<0.05). There is not the remarkable difference between blank control group and tailored radiation group. The above results demonstrates that compound prescription powder mainly made from the rana japonica oil might assist to strengthen the suppression of serum taken from the big mice under X ray irradiation on the hydroxy free radical. (authors)

[en] In_xSn_1-xTe nano-plates and nano-ribbons were grown on Si wafers coated with 300 nm SiO₂ via vapor-transport method. After the growth, the nano-plates and nano-ribbons were fabricated into devices. A sharp superconducting transition was observed at low temperatures. We also tried to fabricate tunneling junctions on the nano-plates and nano-ribbons, and the preliminary results are presented.

[en] SnTe is a three-dimensional topological crystalline insulator. It is known that superconductivity can be induced in SnTe by indium doping, making In${}_x$Sn${}_{1-<!--\; ???\; -->x}$Te a promising platform for searching for topological superconductivity. Here we present our study on superconducting In${}_x$Sn${}_{1-<!--\; ???\; -->x}$Te nanostructures. In${}_x$Sn${}_{1-<!--\; ???\; -->x}$Te nano-plates and nanowires were grown via vapor-transport method. After the growth, they were fabricated into devices and then measured in a cryostat. A sharp superconducting transition was observed in all devices. Point contact spectroscopy was also taken at low temperatures. The preliminary results are presented and discussed.

[en] Yttrium oxide was chosen as the secondary emission substance based on calculation results through first principle theory method. A new kind of pressed yttrium oxide-tungsten matrix dispenser cathodes are prepared by a sol–gel method combined with high temperature sintering in dry hydrogen atmosphere. The results show that the growth of the grains is hampered by the pinning effect of Y₂O₃ distributing uniformly between the tungsten particles, resulting in the formation of small grain size. It is found that Y₂O₃ improves the secondary electron emission property, i.e., the secondary emission yield increases with the increase of Y₂O₃ content in the samples. The maximum secondary emission yield δ_max of the cathode with 15% amount of Y₂O₃ can reach 2.92. Furthermore, the cathode shows a certain thermionic emission performance. The zero field emission current density J₀ of 4.18A/cm² has reached at 1050 °C_b for this kind of cathode after being activated at 1200 °C_b, which are much higher than that of rare earth oxide doped molybdenum (REO-Mo) cathode reported in the previous work. - Highlights: • Yttrium oxide was chosen as the secondary emission substance based on first principle calculation result. • A new kind of cathode has been successfully obtained. • Pressed yttrium oxide-tungsten matrix dispenser cathode exhibits good emission properties. • The improvement of the cathode emission can be well explained by the surface analysis results presented in this work