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  1. Article

    Open Access

    Limits in reaching the anhydrous state of wood and cellulose

    Water-sorption studies and certain organic chemistry reactions require water removal from cellulosic samples. This is hindered by the strong interaction of cellulosic materials with water, and it remains uncer...

    Michael Altgen, Michael Fröba, Julius Gurr, Andreas Krause, Martin Ohlmeyer in Cellulose (2023)

  2. No Access

    Article

    Hygroscopic wood moisture: single and dimerized water molecules at hydroxyl-pair sites?

    A new molecular model is developed for wood moisture sorption in the hygroscopic range of relative humidity (RH < 95%). This model incorporates realistic physical characteristics of wood moisture sorption that...

    Wim Willems in Wood Science and Technology (2018)

  3. No Access

    Article

    Thermally limited wood moisture changes: relevance for dynamic vapour sorption experiments

    In this research, an analytical model is developed for the study of thermal effects on transient uptake of moisture by wood exposed to a stepwise relative humidity (RH) change. This model specifically addresse...

    Wim Willems in Wood Science and Technology (2017)

  4. No Access

    Article

    Wood degradation affected by process conditions during thermal modification of European beech in a high-pressure reactor system

    The degradation of beech wood during a thermal modification process in a high-pressure reactor system using steam as medium was investigated. The wood was modified at different peak temperatures (150–180 °C), ...

    Michael Altgen, Wim Willems, Holger Militz in European Journal of Wood and Wood Products (2016)

  5. No Access

    Article

    The water vapor sorption mechanism and its hysteresis in wood: the water/void mixture postulate

    A new method of wood moisture sorption analysis is presented using sorption isotherms of a series of mildly heat-treated specimens with varied and known elemental composition. This method allows the determinat...

    Wim Willems in Wood Science and Technology (2014)

  6. No Access

    Article

    Hydrostatic pressure and temperature dependence of wood moisture sorption isotherms

    By expressing wood moisture content data as a function of adsorption energy, an interesting scaling capability is obtained, wherefrom the general hydrostatic pressure and temperature dependence of wood moistur...

    Wim Willems in Wood Science and Technology (2014)

  7. No Access

    Book

    Gypsies and Other Itinerant Groups

    A Socio-Historical Approach

    Leo Lucassen, Wim Willems (1998)

  8. No Access

    Chapter

    Introduction

    The student of European history who searches for Gypsies will find them only in footnotes. Today we still know little about how they worked and lived in the past. The same holds true for itinerant groups in ge...

    Leo Lucassen, Wim Willems, Annemarie Cottaar in Gypsies and Other Itinerant Groups (1998)

  9. No Access

    Chapter

    The Church of Knowledge: Representation of Gypsies in Encyclopaedias

    In order to grasp the West European image of Gypsies during the last two hundred and fifty years, we have oral, iconographic and written sources at our disposal: surveys, sculpture, literature, magazines and n...

    Wim Willems, Leo Lucassen in Gypsies and Other Itinerant Groups (1998)

  10. No Access

    Chapter

    Ethnicity as a Death-Trap: the History of Gypsy Studies

    For a long time we have wondered why the findings of research into Gypsy groups have so rarely been the subject of scholarly debate in the field of historical studies on migration, settlement and ethnicity. Wh...

    Wim Willems in Gypsies and Other Itinerant Groups (1998)

  11. No Access

    Chapter

    A Silent War: Foreign Gypsies and the Dutch Government Policy, 1969–89

    In the preceding pages the emphasis has been on historical processes in regard to the representation of Gypsies and other itinerant groups, and government policies towards them. In this and the following chapt...

    Wim Willems, Leo Lucassen in Gypsies and Other Itinerant Groups (1998)