Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Amanda Ogle is a writer for Southern Living covering travel, food and drink, and general lifestyle topics. She also writes product reviews across a range of topics, including travel gear, kitchen ...

It is often possible to separate the reinforcement from the matrix by physical processes. For example, reinforced concrete can be broken up using machinery. This is one stage in recycling the ...

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