An error-free wireless transmission of a 9 Gbit/s on-off keying modulated signal as well as a 4 k video signal is demonstrated using resonant tunnelling diodes as active elements in both the transmitter and the receiver. The employed system and the modulation scheme enabling the high data rate are discussed.
We synthesized four kinds of magnetite particles having average sizes of 7, 18, 40, and 80nm and investigated their heating ability when they were dispersed in an agar gel and exposed to an ac magnetic field at 120kHz, a noninvasive frequency for anticancer hyperthermia. The particles 18nm in average diameter gave the highest heating ability, though they exhibited narrow hysteresis loops as compared to the particles having average diameters of 40 and 80nm. This indicates that hysteresis loss does not contribute much to the heat rise by the 120kHz ac field, and Néel relaxation is dominantly contributing to the heat rise by the 18nm sized particles. A calculation based on Néel relaxation loss gave a plausible explanation.
Nanocomposites of a lithium ion conductor Li1.3Al0.3Ti1.7(PO4)3 and electrode materials (TiO2 and FePO4) were prepared to investigate interfacial structure and ionic conductivity at the interface between the solid electrolyte and electrode materials. It was revealed that lithium ions in the solid electrolyte were attracted to the cathode materials with increasing electrode potential, which increases lithium vacancies in the solid electrolyte.For the FePO4 containing composites, due to the high electrode potential, lithium transfer across the interface and ionic conduction through the cathode materials was remarkable.The results suggest that severe lithium depletion occurs and interfacial resistance is large at the interface of high ionic conductors and cathode materials. The space charge layer thickness is also discussed.
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