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| Re: | Norfolk Terrier Stud Dog | | Ad: | magic story very thanks http://www.climatedots.org/price-of-ventolin-expectorant-capsules.pdf sequence proair generic ventolin australia spiritual The problem with using electromagnetic radiation (in particular RF), to power and communicate with embedded recording elements, is that a significant amount of the transmission energy is deposited in the tissue along the way. The comparatively lower acoustic velocity in tissue accompanies a much-reduced wavelength for ultrasound compared to RF. At the scales relevant to intracortical recording, this smaller wavelength translates the transmission characteristics into the "far field." The hubs can therefore isotropically radiate, or insonate, dispersed dust motes with greater coverage, while still permitting some selectivity via frequency binning. At 10 MHz, for example, the wavelength of ultrasound in brain tissue would be around 150 microns while for RF it might be around 5mm. At 5mm wavelength, antenna systems for RF would operate at suboptimal efficiency.
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