The Low earth orbit Remote Sensing (LRS) satellite network is envisioned as an essential component of bolstering space information applications, thus extending conventional ground information applications to the on-board space information applications. However, it inevitably faces grave challenges imposed by the dynamics of the satellite network's topology, by the intermittence of Inter-Satellite communication Links (ISLs) as well as by the mobility-induced satellite-access switching of mobile terminals. Hence, this is a very different networking landscape from that of the terrestrial Internet. Against these challenging problems, we propose a resilient networking architecture for LRS Satellite Networks (LRS-SNs), with special emphasis on their dynamic routing, resilient transmission and their intrinsic mobility. Specifically, path-quality aided and lifetimeaware dynamic routing is proposed for enhancing the routing against dynamic topology changes. Hop-by-hop data transmission is relied upon for providing transmission resilience against ISL intermittence. Furthermore, data caching is invoked for providing resilience against intermittent communications imposed by dynamic satellite access switching. We employ on semi-physical simulation platform for evaluating the achievable performance of the proposed resilient network architecture.
The massive consumption of fossil energy leads to excessive
emissions
of CO2, which has caused global warming. Solar-driven CO2 conversion is a promising avenue that could solve the energy
crisis and environmental pollution issues simultaneously. For photocatalytic
CO2 conversion reactions, several photocatalysts have been
developed such as semiconductors and plasmonic metal-based catalysts.
Among them, plasmonic metal-based catalysts have attracted extensive
attention due to their strong light harvesting capacities and low
electron–hole pair recombination rates, which are beneficial
for photocatalytic CO2 conversion. This review summarizes
the progress of plasmonic metal-based catalysts in CO2 reduction
with H2, CH4, H2O, and organic chemicals
and generalizes the mechanism of plasmonic metal-based catalysts in
CO2 conversion reactions.
Selectively removing the trace amount of ethyne in ethylene is of great significance for the utilization of ethylene in down-stream process. Selective hydrogenation of ethyne to ethylene is of great...
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