The present study provides a quantitative basis for assessment of proliferation resistance properties of U and Pu isotopes.
Within the large area of issues covered by term of proliferation resistance, the only technical characteristics were chosen as a subject for discussion. The present study concentrates on intrinsic proliferation resistance features focusing the material characteristics associated with bare critical mass (BCM), decay heat (DH) and spontaneous-fission neutrons (SFN), which are treated as the main constituents of isotopic barriers against proliferation. The present study aims at determining major proliferation resistant attributes for U and Pu. This determination is largely based on analysis of their critical bare spheres. The MCNP code coupled with JENDL 3.2 data library is the main tool applied for this study. The other characteristics were summarized from the data available in scientific literature. 相似文献
In order to simulate an accidental hydrogen release from the high pressure pipe system of a hydrogen facility a systematic study on the nature of transient hydrogen jets into air and their combustion behavior was performed at the KIT hydrogen test site HYKA. Horizontal unsteady hydrogen jets from a reservoir of 0.37 dm3 with initial pressures of up to 200 bar have been investigated. The hydrogen jets released via round nozzles 3, 4, and 10 mm were ignited with different ignition times and positions. The experiments provide new experimental data on pressure loads and heat releases resulting from the deflagration of hydrogen–air clouds formed by unsteady turbulent hydrogen jets released into a free environment. It is shown that the maximum pressure loads occur for ignition in a narrow position and time window. The possible hazard potential arising from an ignited free transient hydrogen jet is described. 相似文献
A novel lotus plumule polysaccharide (LPPS) was administered to non-obese diabetic (NOD) mice for 15 weeks to evaluate the protective effects of LPPS on type 1 diabetes. After the 15-week feeding experiment, tumour necrosis factor (TNF)-α, interleukin (IL)-6 and IL-10 expressions in the spleen, liver and kidney of the experimental mice were measured using enzyme-linked immunosorbent assay or real-time quantitative polymerase chain reaction assay. The results showed that LPPS significantly (p < 0.05) decreased the absolute weights of the enlarged spleens in the NOD mice in a dose-dependent manner, inhibited pro-inflammatory TNF-α and IL-6 cytokine production and decreased the secretion ratio of IL-6/IL-10 in splenocyte cultures. LPPS markedly decreased the relative expression of pro-/anti-inflammatory cytokine genes (TNF-α/IL-10 and IL-6/IL-10) in the livers of NOD mice. Our results suggest that LPPS protected the spleen and liver from spontaneous inflammation in NOD mice by modulating pro-/anti-inflammatory cytokine gene expression. 相似文献