Urban ecological green hearts (GHs) are defined as the green spaces at the geometric centers of multiple regions or cities within urban agglomerations (Ghahramani et al., 2021; Kühn, 2003), serving a ...
Stratolaunch has finally found a use for the world's largest airplane. Twice in the last five months, the company launched a hypersonic vehicle over the Pacific Ocean, accelerated it to more than five ...
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