Mass optimization studies of potential upper and lower axial shields for the Affordable Fission Surface Power System are described in detail and a complete shield is developed to meet the radiation dose requirements o...
详细信息
ISBN:
(纸本)9781615673506
Mass optimization studies of potential upper and lower axial shields for the Affordable Fission Surface Power System are described in detail and a complete shield is developed to meet the radiation dose requirements of 10 14 n/cm2 fast (E>1 MeV) neutron fluence and 2 Mrad gamma dose at the Stirling power converters and 5 rem/yr at a lunar outpost located 1 km from the center of the reactor. The upper and lower axial shield sections are developed separately, and then combined with the previously developed radial sections to produce a complete shield. Complete lithium hydride, borated water and boron carbide shields are developed. Lithium hydride yields the lightest complete shield at 6215 kg, followed by the borated water shield at 6663 kg, and the boron carbide shield at 8315 kg.
Carbon dioxide (CO2) corrosion of carbon steel in the presence of brine has been a recognized problem in oil production for many years and it is becoming more common with the extensive use of CO2-flooding as an oil re...
详细信息
We analyze the density-functional theory (DFT) description of weak interactions by employing diffusion and reptation quantum Monte Carlo (QMC) calculations, for a set of benzene-molecule complexes. While the binding e...
详细信息
We analyze the density-functional theory (DFT) description of weak interactions by employing diffusion and reptation quantum Monte Carlo (QMC) calculations, for a set of benzene-molecule complexes. While the binding energies depend significantly on the exchange-correlation approximation employed for DFT calculations, QMC calculations show that the electron density is accurately described within DFT, including the quantitative features in the reduced density gradient. We elucidate how the enhancement of the exchange-energy density at a large reduced density gradient plays a critical role in obtaining accurate DFT description of weakly interacting systems.
Microwave plasma chemical vapor deposition was used to fabricate nanodiamond films. Nitrogen incorporation was achieved by the introduction of N2 gas along with H2 and CH4 gases in the plasma. SEM studies revealed a c...
详细信息
Fluidic lenses with tunable focal distances were experimented in a human eye model as intraocular lenses (IOLs). Fluidic IOL shows superior performance to fixed or optic-shift accommodating IOLs because of their much ...
详细信息
暂无评论