[en] We discuss the application of the regularization independent (RI) scheme of Rome/Southampton to determine the normalization of heavy quark operators non-perturbatively using the Fermilab action

[en] We show that the presence of short chainlike structures in the dense fluid, modeled here for simplification as tetramers, can provide a mechanism to explain the surprisingly large compressibility of liquid deuterium observed in recent shock experiments at megabar pressures. The presence of chains leads to a large increase in the density of states and to a lowering of the Hugoniot temperature thereby increasing the compressibility that in turn increases the maximum density attained by the Hugoniot

[en] Ruthenium catalysts supported on SiO₂, Al₂O₃ and TiO₂ were prepared by the impregnation method. Temperature-programmed desorption (TPD) method was applied to investigate the kinetics of hydrogen adsorption/desorption on these catalysts. All the TPD results show two-peak profile, except Ru/SiO₂. The low-temperature peak was assigned to the hydrogen adsorbed on the Ru metal. The high-temperature peak was attributed to the spillover of hydrogen atoms from metal to the support. Both are activated process. The amount of adsorbed hydrogen increased with increasing adsorption temperature, and the maximum adsorption occurs at above 200 deg. C. The activation energy of adsorption is a function of catalyst support and the reduction temperature. It decreases in the order of Ru/TiO₂ (500 deg. C reduction)>Ru/Al₂O₃>Ru/TiO₂ (300 deg. C reduction)>Ru/SiO₂. The results demonstrated that the strong metal-support interaction exerted on Ru/TiO₂ would suppress hydrogen chemisorption at room temperature due to its high activation energy. However, hydrogen chemisorption on Ru/TiO₂ was not suppressed at high temperature. One is able to measure the Ru dispersion by adsorption of hydrogen at high temperature

[en] The Safeguards Summary Event List (SSEL) provides brief summaries of several hundred safeguards-related events involving nuclear material or facilities regulated by the U.S. Nuclear Regulatory Commission (NRC). Events are described under the categories of bomb-related, intrusion, missing and/or allegedly stolen, transportation, vandalism, arson, firearms, sabotage and miscellaneous. The information contained in the event descriptions is derived primarily from official NRC reporting channels

[en] In this study, X-ray photoelectron spectroscopy (XPS) was used to evaluate the hypothesis that macrophage cells and their released compounds change Ti-6Al-4V surface oxide composition. Ti-6Al-4V surfaces, prepared to simulate clinical conditions, were exposed for 3 days to cell culture medium, macrophage cells, or macrophage cells activated to release inflammatory reactive chemical species (RCS). The as-polished samples were used as controls. The as-polished samples exhibited typical TiO₂ surface oxides. After samples were exposed to medium, only C, O and N peaks from absorbed proteins were observed. When cultured with cells or activated cells, the Ti peaks reappeared and there was a significant shift in the O 1s peak to lower metal oxide binding energies (∼530 eV). This shift was associated with a significant increase in total metal oxides on sample surfaces as compared to medium only surfaces. With activated cells, the enhancement of the surface oxides was attributed to oxidation of the surface by the RCS released by activated macrophage cells (e.g. O₂+NO→NO₃^- and M+NO₃^-→M=O+NO₂^-). These data support the hypothesis that macrophage cells and released RCS affect Ti-6Al-4V surface oxides. Changes in surface oxides are important since they may affect alloy-tissue interactions

[en] It is clear from the kinetic energy spectrum published by Vinnichenko in 1970 that the atmospheric fluctuations with periods between about 10 and 100 days form a very important part of the atmospheric flow. These oscillations, often called low-frequency or intra-seasonal fluctuations, could result from an instability of the time-mean flow, from an interaction with the oceans, or from a nonlinear transfer of energy from the faster synoptic-scale eddies. In the present study we concentrate on this last possibility and examine, with the help of atmospheric data and general circulation model (GCM) output, the extent to which the synoptic-scale eddies affect the low-frequency fluctuations

[en] The endochronic theory of plasticity has been applied to study the axially symmetric motion of a finite circular cylindrical shell subjected to an arbitrary pressure transient applied to its inner surface. The constitutive equations for thin shells have been obtained. The governing equations are then solved by means of the characteristics method. It is found that there exist two characteristic waves: one corresponds to the longitudinal wave while the other represents the shear wave. Several numerical examples are presented for specific boundary conditions and a prescribed loading history along the axial direction. The radial displacement profiles in this analysis show the coupling effect of both longitudinal and shear waves. Furthermore, the resultant displacement history seems in good agreement qualitatively with the pressure input function. (Auth.)

[en] A Reply to the Comment by Min-Fong Yang, Shih-Jye Sun, and Ming-Che Chang

[en] Chang-hua Christian hospital needs to uninstall the ⁶⁰Co unit. The mode of this ⁶⁰Co teletherapy unit is SHIMADZU RTGS-10. The original lead head was taken as the source container of this ⁶⁰Co unit. The source head was dismantled and put into the prepared wooden box, after the source was sealed. This study describes the planning and dismantling of the retirement and transport of the ⁶⁰Co unit, and personal doses measured during the procedure. This work estimates the doses of radiation received by exposed workers during the dismantling of the machine. The workers received doses of approximately 53 μSv. This study shows that the original lead head can be used as the source container of this ⁶⁰Co unit. The ⁶⁰Co machine was smoothly dismantled and transported by conscientious and careful workers, using planned and controlled radiation protection, following the ALARA (as low as reasonably achievable) rule. (author)

[en] The low-velocity Barkas-effect correction term for the Bethe--Bloch stopping-power formula has been calculated with each of the three extant formalisms for targets with atomic numbers from 1 to 18 and for projectile velocities from 0.025c to 0.3c. Comparison of each with measurements on aluminum revealed which formalism provided the best fit over three different projectile velocity intervals. The method yielding the generally superior agreement was used to calculate the stopping power of each element (except Li, F, Na, Mg, P, and Cl) for protons and alpha particles with energies between 0.5 and 5.0 MeV. Results corresponded very closely to those of an existing fit to most known experimental data