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Recently, energy harvesting from ambient energy sources, including solar and vibrational energy, has been investigated as a candidate for powering next-generation wireless sensor networks. However, unlike a battery-powered network, power supplementation of energy harvesting is unstable. Therefore, when a node sends data, the relay nodes are not always available for receiving or transmitting. A node...
15 N-Choline-d 13 was synthesized as a new biomarker for dynamic nuclear polarization, and the lifetime of the polarized signal governed by the spin–lattice relaxation time T 1 was measured. 15 N-Choline-d 13 exhibited a T 1 that was over twice as long as that of 15 N-choline, and the hyperpolarized 15 N signal could be observed for 1 h.
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