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, ...

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 ...

When the monsoon rains start coming, Verde Valley rockhounds come running. And from first rainfall, there is no time for games for rockhounds, or amateur geologists, when it comes to hunting for ...

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