Many factors concerning a city will be considered to host a large-scale sports games which will have great influences on the city.Based on the catalyst theory,this paper analyses PE events catalyst effect on the process of city development from the aspects of the space planning,economic structures and soft power of the cities that held recent three National Games.It is of great importance to optimize city structures,promote the adjustment of industrial structure,increase the core value of the city,and speed the city's development by making full use of large-scale sports events.
In this study a light-shielding plate with a hole was placed in an intralipid emulsion. The probability distribution for photons emitted from a surface light source, passing through the hole at different depths, and reaching a surface detector at the other side of the plate was experimentally assessed. We provide qualitative verification for a model derived by Weiss et al. [J. Mod. Opt. 36, 349 (1989)] that the migration depths for the measured photons follow a distribution in depth and that this distribution has a maximum probability at a describable depth beneath the surface. This agreement, corroborated by a parallel study, suggests that we may have assessed the maximum migration depth distribution of photons that reached the detector and that the random walk model may describe the maximum migration depth distribution. The experimental results indicate that photons with the same path lengths within the medium reach a wide range of depths and suggest difficulties in resolving optical structure with time-resolved measurement. The results also provide experimental evidence that, for a given source–detector separation, the photons that migrate deeper have longer mean path lengths with larger variation in their path lengths.
A novel AS61 magnesium alloy is prepared via the small-hole confinement of liquid alloy by using a thick-walled copper mould. This facile method gives rise to distinct grain refinement and dispersed second phases such as nano-scale Mg2Sn (12.54 3.35 nm). Benefiting from the unique microstructure, the AS61 shows enhanced anode performance when adopted for primary aqueous battery, as compared with that using the anode of the same composition fabricated via a common iron mould during melting and casting. The Mg-air battery with the novel AS61 anode provides a high voltage of 1.269 V at 10 mA cm−2; its anodic efficiency at 10 mA cm−2 reaches 78.4%, which is higher than lots of other types of magnesium anodes. Moreover, the discharge mechanism of AS61 is also unravelled based on electrochemical response and microstructure characterization.
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