The Seebeck coefficient S and power factor P of single-wall carbon nanotube (SWCNT) networks were systematically investigated as a function of chemical potential μ, based on theoretical simulations employing non-equilibrium Green’s function theory. The results focused on the gap regions of semiconducting (s-)SWCNTs. The thermoelectric properties of individual SWCNTs were classified into three groups: s-SWCNTs, metallic (m-)SWCNTs, and pseudo-metallic SWCNTs. The maximum values of P for individual s-SWCNTs was independent of SWCNT diameter. In parallel and serial networks of SWCNTs, S and P were found to be very sensitive to the amount of m-SWCNTs, as well as the SWCNT diameter distributions. A comparison with experimental results suggested that an SWCNT bundle can be modeled as a “rope” with an equivalent S calculated for parallel circuits. The presence of SWCNT junctions in the films substantially reduced the P value from those of the composing SWCNTs while S was almost unvaried.

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Abstract-An increase in elderly shopping refugees is considered as a serious social problem. Therefore, this paper proposes a new web shopping support system for the elderly shopping refugees. Features of the proposed system are 1) to use WebRTC for synchronizing displayed web pages instead of a centralized proxy server, 2) setup procedures of end-to-end communication through NAT devices by utilizing a general mail service, 3) a mutual authentication method using video streaming of the WebRTC technology, and 4) remote assistance methods for teaching shopping refugees how to use EC sites. Evaluation of the proposed methods has shown that the WebRTC technology and the proposed remote assistance methods are effective for the web shopping support.