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. 2019 Dec 28;20(1):187. doi: 10.3390/s20010187

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) A wireless sensor node with a solar panel and a harvested battery. (b) A sensor node as shown in Figure 1a is installed on a utility pole to monitor environmental information.