Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Mobilization of biomass for energy from boreal forests in Finland & Russia under present sustainable forest management certification and new sustainability requirements for solid biofuels
    Sikkema, R. ; Faaij, A.P.C. ; Ranta, T. ; Heinimö, J. ; Gerasimov, Y.Y. ; Karjalainen, T. ; Nabuurs, G.J. - \ 2014
    Biomass and Bioenergy 71 (2014). - ISSN 0961-9534 - p. 23 - 36.
    environmental impacts - wood - bioenergy - resources - fuel - alternatives - procurement - potentials - countries - products
    Forest biomass is one of the main contributors to the EU's renewable energy target of 20% gross final energy consumption in 2020 (Renewable Energy Directive). Following the RED, new sustainability principles are launched by the European energy sector, such as the Initiative Wood Pellet Buyers (IWPB or SBP). The aim of our study is the investigation of the quantitative impacts from IWPB's principles for forest biomass for energy only. We deploy a bottom up method that quantifies the supplies and the costs from log harvest until forest chip delivery at a domestic consumer. We have a reference situation with existing national (forest) legislation and voluntary certification schemes (scenario 1) and a future situation with additional criteria based on the IWPB principles (scenario 2). Two country studies were selected for our (2008) survey: one in Finland with nearly 100% certification and one in Leningrad province with a minor areal share of certification in scenario 1. The sustainable potential of forest resources for energy is about 54 Mm3 (385 PJ) in Finland and about 13.5 Mm3 (95 PJ) in Leningrad in scenario 1 without extra criteria. The potential volumes reduce considerably by maximum 43% respectively 39% after new criteria from the IWPB, like a minimum use of sawlogs, stumps and slash for energy, and by an increased area of protected forests (scenario 2A Maximum extra restrictions). In case sawlogs can be used, but instead ash recycling is applied after a maximum stump and slash recovery (scenario 2B Minimum extra restrictions), the potential supply is less reduced: 5% in Finland and 22% in Leningrad region. The estimated reference costs for forest chips are between €18 and €45 solid m-3 in Finland and between €7 and €33 solid m-3 in the Leningrad region. In scenario 2A, the costs will mainly increase by €7 m-3 for delimbing full trees (Finland), and maximum €0.3 m-3 for suggested improved forest management (Leningrad region). In scenario 2B, when ash recycling is applied, costs increase by about €0.3 to €1.6 m-3, depending on the rate of soil contamination. This is an increase of 2%, on top of the costs in scenario 2A.
    Farmers, Vertical Coordination, and the Restructuring of Dairy Supply Chains in Central and Eastern Europe
    Dries, L.K.E. ; Germenji, E. ; Noev, N. ; Swinnen, J. - \ 2009
    World Development 37 (2009)11. - ISSN 0305-750X - p. 1742 - 1758.
    foreign direct-investment - trade credit - food safety - private - standards - transition - produce - supermarkets - enforcement - procurement
    The combination of transition and globalization since the early 1990s has caused dramatic changes in the dairy chains in Central and Eastern Europe. This paper uses survey evidence from several Central and East European countries to document the growth of vertical coordination in the dairy chain, its relationship with policy reforms, its effects and the implications for small farms. Evidence suggests that in several countries small dairy farms have benefited from vertical coordination processes by providing them access to inputs and higher value markets.
    Value chain management for commodities: a case study from the chemical industry
    Kannegiesser, M. ; Günther, H.O. ; Beek, P. van; Grunow, M. ; Habla, C. - \ 2009
    OR Spektrum 31 (2009)1. - ISSN 0171-6468 - p. 63 - 93.
    revenue management - optimization - procurement - strategies - airlines - networks - capacity - prices - market
    We present a planning model for chemical commodities related to an industry case. Commodities are standard chemicals characterized by sales and supply volatility in volume and value. Increasing and volatile prices of crude oil-dependent raw materials require coordination of sales and supply decisions by volume and value throughout the value chain to ensure profitability. Contract and spot demand differentiation with volatile and uncertain spot prices, spot sales quantity flexibility, spot sales price¿quantity functions and variable raw material consumption rates in production are problem specifics to be considered. Existing chemical industry planning models are limited to production and distribution decisions to minimize costs or makespan. Demand-oriented models focus on uncertainty in demand quantities not in prices. We develop an integrated model to optimize profit by coordinating sales quantity, price and supply decisions throughout the value chain. A two-phase optimization approach supports robust planning ensuring minimum profitability even in case of worst-case spot sales price scenarios. Model evaluations with industry case data demonstrate the impact of elasticities, variable raw material consumption rates and price uncertainties on planned profit and volumes
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