Tokiichiro Takahashi

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(ii) that the ratio of aboveground biomass to root biomass is 3 :1 {the average value of three studies in Brazilian Amazonia [P. Fearnside, Emissão e Sequestro de CO 2 (Companha Vale do Rio Doce, Rio de Janeiro, 1994), pp. 95–124]}, consistent with a global analysis of root biomass allocation [M. A.logia 111, 1 (1997)]; and (iii) that root biomass increased(More)
Pencil tracing, a new approach to ray tracing, is introduced for faster image synthesis with more physical fidelity. The paraxial approximation theory for efficiently tracing a pencil of rays is described and analysis of its errors is conducted to insure the accuracy required for pencil tracing. The paraxial approimation is formulated from a 4x4 matrix (a(More)
We propose an intermediary approach to utilizing existing Web resources as educational material. The Web is attractive for educational use but it is not completely suitable. To fix the remedy, we developed an integrated proxy server, called WebAngel, which can automatically and individually personalize Web resources for students. This paper presents the(More)
TransCom3 is an intercomparison project for CO source inversions. Annual mean atmospheric CO data are used to estimate CO sources using 16 different atmospheric transport models. Here we test the sensitivity of the inversion to the atmospheric data including data network choice, time period of data, baseline data selection and the choice of data uncertainty(More)