Waste input-output material flow analysis of metals in the japanese economy

Shinichiro Nakamura, Kenichi Nakajima

    Research output: Contribution to journalArticle

    50 Citations (Scopus)

    Abstract

    This paper develops a theoretical model of material How analysis (MFA) within the framework of the Waste Input-Output model (WIO) (Nakamura and Kondo). The model is developed based on two fundamental ingredients: yield ratios and the degree of fabrication. In manufacturing process, multiplication of physical inputs by the yield ratios gives the portion that enters physical outputs, with the rest being discarded as process waste without entering outputs. In input-output analysis, the degree of fabrication can be visualised as triangularity of the input coefficients matrix (goods of lower degree of fabrication ran enter those of higher fabrication, but the reverse does not hold), which is known to emerge through an appropriate reordering of sectors. Application to the Japanese IO data indicates that the model can provide accurate estimates of the weight as well as the composition of metals (Fe. Cu, Pb, Zn, and Al) used in a passenger car. The model is also used to estimate the major final use categories (household consumption, public consumption, capital investment, inventory investment, and export) of metals.

    Original languageEnglish
    Pages (from-to)2550-2553
    Number of pages4
    JournalMaterials Transactions
    Volume46
    Issue number12
    DOIs
    Publication statusPublished - 2005 Dec

    Fingerprint

    economy
    Metals
    output
    Fabrication
    fabrication
    metals
    passengers
    Passenger cars
    estimates
    multiplication
    ingredients
    sectors
    manufacturing
    coefficients
    Chemical analysis

    Keywords

    • Input-output analysis
    • Material flow analysis
    • Triangularity

    ASJC Scopus subject areas

    • Materials Science(all)
    • Metals and Alloys

    Cite this

    Waste input-output material flow analysis of metals in the japanese economy. / Nakamura, Shinichiro; Nakajima, Kenichi.

    In: Materials Transactions, Vol. 46, No. 12, 12.2005, p. 2550-2553.

    Research output: Contribution to journalArticle

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