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The dynamic behavior of water molecules in tofu gels is observed using dielectric spectroscopy (DS) and pulsed field gradient nuclear magnetic resonance (PFG-NMR) methods. The breaking stress of tofu gels are dependent on the heating time, which affects the water structures characterized by the dielectric relaxation time, τ. On the other hand, the inhomogeneity of the gel structures decreases with...
We are developing multi-hop wireless LAN access points (APs) for a Community Information Network (CIN) to be deployed in Takanawa area, Minato City, Tokyo, Japan, to transfer information supporting citizens' daily lives and to provide the internet access environment for both residents and tourists. This paper shows a prototype development of the AP device for the CIN made by the Raspberry Pi boards...
This paper deals with partial discharge (PD) current waveforms in transformer oil measured with the SHF_PDPW (super high frequency wideband PD current pulse waveform measurement) system that enables us to obtain accurately waveforms up to SHF band (3–30GHz). We investigated the PD current pulse waveform, especially on the rise time, the current peak, and the charge quantity obtained by the time integral...
This paper deals with PD current pulse waveforms of environmental friendly gases such as N2, CO2, dry air, and CF4 gas that were measured with the SHF_PDPW (Super High Frequency wideband PD current Pulse Waveform measurement) system. This specially developed system enables us to obtain accurately PD current pulse waveforms up to the SHF band (330GHz). When one discusses the UHF method for the insulation...
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