[en] We report on an investigation of the optical properties of gold nanoparticles assembled as thin films of different thickness. The nanoparticles were linked to the surface of a gold chip by dithiol reagents and studied by surface plasmon resonance (SPR) spectroscopy and atomic force microscopy. There is good correlation between the experimental findings and theoretical simulation, and the respective data reveal the presence of ordered nanostructures in the assemblies. The shift in the SPR angle is linearly dependent on the particle size and the ratio of the different particles. SPR spectroscopy also reveals important information in terms of the optical constants of such films. This shall be further applied to in-situ quality control in the fabrication of optoelectronic, solar cell and semiconductor devices. (author)

[en] The objective of this report is to develop the optimization of off-gas trapping capabilities on pyroprocessing at KAERI. Based on KAERI's experimental results and experience on the trapping characteristics in terms of chemical species, vacuum degree, and trapping temperature, INL hot experiments will be performed in off-gas treatment system (OTS) for a voloxidizer. Experiments were performed using KAERI OTS (Off-gas Trapping System) to trap the volatile. A fly ash filter was used as a trapping media for cesium, rubidium, molybdenum, and cadmium. Ca-I and Ca-II filters were used a trapping media for technetium (rhenium), molybdenum, antimony, and tellurium, respectively. As results of trapping experiments, it was found that trapping efficiency of gaseous cesium by fly ash filter at 1100 .deg. C under a vacuum condition was increased by ∼ 10 times, in comparison with that of 1100 .deg. C. Trapping efficiency by fly ash filter at 1100 .deg C under a vacuum condition was increased by ∼ 10 times, in comparison with that of 1100 .deg. C. Successful trapping of Mo, Te, and mixed species by using Ca- II filter under a vacuum of 7.6 torr was achieved and rhenium was well trapped under a vacuum of 76 torr. Trapping performance of molybdenum by Ca- II filter was better than that of fly ash filter. This report will be used as a useful means for determining optimization of trapping capabilities for trapping semi-volatile fission products

[en] High temperature structures of LMR experience inelastic deformation such as plasticity and creep due to high temperature operating temperature of 530∼550 .deg. C. The generated creep strains are connected with the stress relaxations, redistributions and/or progressive deformations. The superposition of primary and secondary stresses may lead to enhanced creep deformations. The term 'creep ratchetting' refer to the phenomenon where enhanced creep occurs with plasticity ratcheting. The interchange of elastoplastic and creep strains is important for its understanding. Since creep ratcheting is highly nonlinear structural behavior, it is required to secure the proper analysis technique to evaluate inelastic strain due to enhanced creep. In this project, the simplified evaluation method for enhanced creep using core stress concept was investigated and the enhanced creep of pipe subjected to sustained axial tensile loading and transient thermal loading with hold time was evaluated using several analysis models; that is, isotropic hardening model, kinematic hardening model and combined hardening model with Norton's power law creep equation. In addition, the viscoplastic analysis using NONSTA-VP was performed for comparisons. The simplified evaluation method using core stress concept yields conservative result as expected. It is necessary to systematize the simplified evaluation procedure, to analyze the conservatism of the method, and to improve the inelastic analysis techniques including NONSTA-VP

[en] The effect of pH on the stress corrosion cracking was studied in 0.1 M sodium thiosulfate solution using two stress corrosion cracking testing methods (constant load and slow strain rate technique). The stress corrosion cracking resistance of sensitized 304 stainless steel decreased with lowering pH of the solution. Although the results agreed well in the above two experimental methods, slow strain rate technique was more efficient than constant load method in assessing the pH effect. The acoustic emission signals during the experiments were analyzed, that supports the film rupture mechanism of stress corrosion cracking

[en] Kinetic deuterium isotope effects (k/sub H₂O//k/sub D₂O/) have been measured for nucleophilic attack by water at primary alkyl carbon [S-methylthiophenium ion (MeTh+), methyl trifluoromethane-sulfonate (MeOTf), methyl and ethyl perchlorate (MeOClO₃, EtOClO₃)] in aprotic solvents [acetonitrile (MeCN) and tetrahydrothiophene-1, 1-dioxide (TMSO₂; solfolane)] and L₂O. In L₂O solvent k/sub H₂O//k/sub D₂O/ is significantly greater than unity while it is reduced to near unity in aprotic solvents. The oxygen-18 isotope effect has also been observed to be 1.002 +- 0.004 for the reaction of MeTh⁺ with dilute H₂O in TMSO₂ at 35⁰C. For the reaction of MeTh⁺ and MeOClO₃ in aprotic solvents the chemical reaction kinetics are discussed

[en] We review the current theoretical situation with regard to the anomalously large cross section for exclusive J/ψ + η_c production in e⁺ e^- annihilation, as measured by BELLE Collaboration

[en] We review predictions, based on the nonrelativistic QCD factorization framework, for the polarizations of prompt J=ψ's and Υ(nS)'s produced at the Fermilab Tevatron. We also discuss the effect of relativistic corrections on the theoretical prediction for the polarization of prompt J=ψ's at the Tevatron

[en] Using the η → γγ and η' → π⁺π^-η decay modes the authors have investigated the D_s → η ell ν and D_s → η'ell ν decays. The data consist of e⁺e^- collisions at √s ∼ 10 GeV recorded by the CLEO II detector at CESR. The authors present the branching fractions of D⁺_s → η ell ⁺ν relative to D⁺_s → φ ell ⁺ν

[en] This is contract result report conducted by KAERI under the contract with NETEC for structural and thermal evaluation of transport package for radioactive waste. This report contains that conceptual design has been re-conducted for type IP, type A and type B transport package considering conditions of the domestic nuclear power plant. The results of structure analyses for type IP and type A transport package showed that the transport packages were maintained the structural integrities. The model of two type IP-2 transport package, type A and type B transport package were made. Two type IP-2 transport package were conducted the drop tests. And the type A transport package were executed drop tests and a penetration test. the type IP-2 package and the type A transport package were maintained the structural integrities. The safety test for the type B transport package are prepared

[en] This is contract result report conducted by KAERI under the contract with NETEC for structural and thermal evaluation of transport package for radioactive waste. This report contains the analysis domestic and foreign technical regulations considering structural and thermal fields and the state of art, establishment of design criteria and conceptual design of transport package for radioactive waste. The states of art have been analyzed for foreign transport package of radioactive waste. Design criteria have been established and conceptual design has been conducted for type IP, type A and Type B. Structural analyses have been carried out for type IP and type A transport package . The results of structural analyses showed that the storage cask was maintained the structural integrities. Conceptual structural and thermal analyses for type B transport package have been carried out