GreenDelivery: Proactive Content Caching and Push with Energy-Harvesting-based Small Cells

The explosive growth of mobile multimedia traffic calls for scalable wireless access with high quality of service and low energy cost. Motivated by the emerging energy harvesting communications, and the trend of caching multimedia contents at the access edge and user terminals, we propose a paradigm-shift framework, namely GreenDelivery, enabling efficient content delivery with energy harvesting based small cells. To resolve the two-dimensional randomness of energy harvesting and content request arrivals, proactive caching and push are jointly optimized, with respect to the content popularity distribution and battery states. We thus develop a novel way of understanding the interplay between content and energy over time and space. Case studies are provided to show the substantial reduction of macro BS activities, and thus the related energy consumption from the power grid is reduced. Research issues of the proposed GreenDelivery framework are also discussed.Comment: 15 pages, 5 figures, accepted by IEEE Communications Magazin

Hydrating and dehydrating dynamics process as an ion entering a carbon nanotube

Ion transport within confined environments, like nanopores and nanotubes, is pivotal for advancing a range of applications, including biosensors, seawater desalination, and energy storage devices. Existing research does not sufficiently delve into the alterations in ion hydration structure, a key element that significantly influences ion transport properties in such confined environments. Here, we report a theoretical model comprehensively considering the interplay between ions and nanotubes. By incorporating the effect of orientational competition, our model effectively predicts both the change in hydration structure and the free energy profile during an ion's transition from bulk water into a nanotube. These predictions match closely with the results from molecular dynamics simulations.Comment: 4 pages, 3 figure