Enriched structures on stable curves over fields were defined by Mainò in the late 1990s, and have played an important role in the study of limit linear series and degenerating jacobians. In this... Show moreEnriched structures on stable curves over fields were defined by Mainò in the late 1990s, and have played an important role in the study of limit linear series and degenerating jacobians. In this paper we solve three main problems: we give a definition of enriched structures on stable curves over arbitrary base schemes, and show that the resulting fine moduli problem is representable; we show that the resulting object has a universal property in terms of Néron models; and we construct a compactification of our stack of enriched structures. Show less
Fisher, E.; Luning, S.; Obodai, N.; Araujo, C.H.; Calvimontes, J.; Camp, E. van de; ... ; Twongyirwe, R. 2023
This book uses text and photographs to highlight a transdisciplinary research project (2018-2022) about artisanal and small-scale gold mining that involved transdisciplinary collaboration between... Show moreThis book uses text and photographs to highlight a transdisciplinary research project (2018-2022) about artisanal and small-scale gold mining that involved transdisciplinary collaboration between academics, artists, and gold miners. With the title Exploring Transformations to Sustainability in Artisanal and Small-scale Gold Mining: Trans-regional and Multi-Actor Perspectives, or Gold Matters for short, the project examined whether and how societal transformations towards sustainable mining futures are possible in artisanal and small-scale gold mining. It brought together a multi-national team to conduct research in Brazil, Suriname, Ghana, Burkina Faso, Guinea Conakry, and Uganda. Show less
Forty years of Leiden environmental sciences relates the story of CML, today one of the Faculty of Science’s eight institutes but with its roots in a more or less in dependent group of ex-activists... Show moreForty years of Leiden environmental sciences relates the story of CML, today one of the Faculty of Science’s eight institutes but with its roots in a more or less in dependent group of ex-activists within the university. Back in the day, many of those at the top of the university would probably have had trouble accepting that ‘those upstarts’ would still be around forty years on – not locked away in some cubbyhole with their stencil duplicator, but as a professor, assistant professor or even a dean. Today they are professors emeritus or have retired: Helias Udo de Haes, Wouter de Groot, Gerard Barendse, Gjalt Huppes, Gerard Persoon, Hans de Iongh and Jan Boersema – which doesn’t stop most of them just carrying on working. And a new generation of environmental scientists is now leading CML’s research and teaching: Geert de Snoo, Arnold Tukker, Martina Vijver, Peter van Bodegom, Jeroen Guinée, Ester van der Voet and René Kleijn. Show less
