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Head Department of Inorganic and Physical Chemistry (1988-1990)
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Royal Netherlands Chemical Society: treasurer General Board (1988-1990), secretary Inorganic and Physical Chemistry Division
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Netherlands Organization for the Advancement of Pure Research: Board member of working party for Solid State Chemistry (1987-1988)
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Delft Nuclear Research Facility: Board member (1988-1993)
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National Ceramic Research Facility: member of Scientific advisory committee
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Member Steering group National Research Programme High Tc Superconductors (1990-1996)
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Member of the International Advisory Board of the Solid State Ionics Conferences (1983-present))
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Counciler of the International Society for Solid State Ionics (1990-1993)
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Treasurer of the International Society for Solid State Ionics (1994-1996)
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Member World Federation of Scientists (1993-present)
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Chairman of the Board of the Academy Committee for Chemistry (1992-1997)
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Dutch representative in Expert Group of International Energy Agency - Electric Vehicle Agreement. Annex V (1994-2000).
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Member Steering Group Global Change of the Royal Academy of Sciences (1995-1997)
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Member of the Board of The Netherlands Foundation for Chemical Research (1994-1997)
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Dean of the Faculty of Chemical Technology and Materials
Science (1993-1997)
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Co-chairman European Science Foundation Programme: Vapour-Phase Synthesis of Processing of Nano-Particle Materials (NANO) (1995-2000)
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Chairman of the Board of the Delft Nuclear Research Facility (1997-2000)
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Chairman of the Board of ISES-NL (Society for Solar Energy) (1997-2000)
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