This PhD thesis concerns the topic of arithmetic geometry. We address three different questions and each of the questions in some way is about counting how big some set is or can be.

All life on earth contains DNA, which is used to store biological information. Organisms compact their DNA in order for it to fit inside their cell(s).

Terwijl tienduizenden bezoekers dansen op snoeiharde muziek probeert een team Leidse psychologen op Lowlands harde data te verzamelen voor hun onderzoek. Hoe beleven festivalgangers een virtuele trip? En welke rol spelen factoren als weinig slaap en wel of geen ervaring met psychedelica?

In this thesis, we developed new ways to use a technique called electroextraction (EE) to extract charged molecules from one liquid into another using an electric field.

This project, South American population history revisited: multidisciplinary perspectives on the Upper Amazon (SAPPHIRE), investigates population dynamics in western South America on the basis of traces in the geographical, genetic, archaeological, ethnological, and linguistic record.

Anthropogenic noise negatively affects wildlife in a wide range of taxonomic groups.

In multi/many-core System-on-Chips (SoCs), the performance is almost linearly scaling with the number of processing elements.

The subject of this thesis, ‘Approach to Markov Operators on Spaces of Measures by Means of Equicontinuity’, combines an analytical and probabilistic approach to Markov operators.

The lipids in the uppermost layer of the skin, the stratum corneum (SC), play an important role in the skin barrier function. The three main SC lipid classes are ceramides (CER), cholesterol and free fatty acids.

Promotor: A. Achúcarro, Co-Promotor: G.A. Palma

This thesis focuses on amyloid proteins, a class of proteins that convert into amyloid fibrils.

The studies described in this thesis deal with glycosidases, in particular alpha-galactosidases.

This thesis addresses questions on effectively using variational quantum circuits for machine learning tasks.

How are links between macro-invertebrate diversity and ecosystem functioning influenced by anthropogenic pressures?

Unconstrained day-to-day activities are difficult to quantify and how the corresponding movements shape the brain remain unclear. Read more

The soil ecosystem consists of the largest reservoir of biodiversity on Earth.

With the energy transition toward a renewable energy supply and a CO2-neutral economy, electrification of the energy system is rising in importance, which leads to the challenge of long-term storage of renewable electricity.

Promotor: G.R. de Snoo, Co-promotor: H.H. de Iongh, C.J.M. Musters

What performance criteria does a new technology have to fulfill in order to be added to the list of future energy options and what constraints exist in terms of broad market penetration?

The thesis mainly contributes to the characterization of Majorana fermions as they appear in the Condensed Matter context.

Lysosomal glycosidases are acid hydrolases that fragment glycoconjugates in lysosomes.

Low-carbon (LE) technologies have a significant potential to reduce the total carbon emissions in China.

Spectroscopic studies on fluorescent single molecules in organic condensed matter does not only provide information about the molecule itself, but also its near environment. By suppression of phonon-induced broadening of spectral lines through cooling to low temperatures, small changes in the spectral…

Op 18 september 2019 verdedigde Huw Llewellyn zijn proefschrift 'An Institutional Perspective on the United Nations Criminal Tribunals: Governance, Independence and Impartiality'. Het promotieonderzoek is begeleid door promotoren prof.dr. N.M. Blokker en prof.dr. L.J. van den Herik.

In deep reinforcement learning, searching and learning techniques are two important components. They can be used independently and in combination to deal with different problems in AI, and have achieved impressive results in game playing and robotics. These results have inspired research into artificial…

Promotor: G.R. de Snoo, Co-promotores: M.G. Vijver, J.P.M. Vink

Nature uses a special class of histone proteins, histone variants, to modulate the properties of chromatin at defined genomic locations.

The research described in this thesis combines the latest insights in lysosomal function with lysosome centred cell signalling.

Anthropogenic noise has been shown to affect marine animals in various ways, this may have fitness consequences at individual and population level. This thesis aims to increase insight into the quantification of sound-induced behavioural responses that are relevant to fitness, and into factors that…

Het Levend Lab van de Universiteit Leiden verhuist naar het hart van het Leiden Bio Science Park. Op de nieuwe plek tussen de Hogeschool, Mentor en Naturalis, zijn de eerste slootjes inmiddels gegraven. Deze nieuwe locatie is beter toegankelijk voor zowel wetenschappers als publiek. Hier kunnen onderzoek…

In samenwerking met diverse partners bouwt de afdeling Staats- en Bestuursrecht aan projecten in Den Haag - de internationale stad van vrede en recht. In dit kader is The Hague Law Labs ontstaan.

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Er gaan dit jaar niet één, maar twee citizen science-onderzoeksprojecten van start in Leiden en Den Haag. Dat is de uitkomst van een grote uitvraag onder inwoners en wetenschappers van de beide universiteitssteden. Het Citizen Science Lab gaat de winnaars helpen hun idee uit te voeren, met steun van…

Wie vertelt de kiezer hoe goed we het hebben in Nederland? En waarom kan je sowieso maar beter gaan stemmen? Dat legt Gert Jan Lelieveld uit in NRC. Willem van der Does tipt bij de NOS om af en toe het geluid eens uit te zetten bij een tv-debat. Lees meer van beide psychologen in de Nederlandse media.…

Songbirds as vocal learners learn their songs and song preference from social tutors⁠. Tutor choice for both song and preference learning are important to characterize for understanding individual learning performance and cultural transmission of song⁠.

Promotor: Prof.dr. H.J.A. Rottgering

The use of N fertilizers has increased worldwide in the past century. While this increased input of N has increased food productivity, it has also contributed to decreases in biodiversity, soil quality and environmental health, including increases in greenhouse gas emissions.

Op 19 september 2019 verdedigde Lynette Janssen zijn proefschrift 'EU Bank Resolution Framework: A comparative study on the relation with national private law'. Het promotieonderzoek is begeleid door promotoren prof.mr. W.A.K. Rank en prof.mr. M. Haentjens.

Promotor: G.R. de Snoo, W. Kustiawan, Co-promotor: H.H. de Iongh

Promotores: C.A.J. Knibbe; J.N. van den Anker, Co-promotores: H.P.A. van Dongen; B. van Ramshorst

Promotor: Prof.dr. J.M. van Ruitenbeek, Prof.dr. R.M. Tromp

Including modelling as part of software development appears to have various benefits.

Promotores: Prof.dr. P.M. Brakefield, Prof.dr. B.J. Zwaan (Wageningen Universiteit)

Building a Deep Cross-media Transfer Network to extract visual relations that relieve the problem of insufficient training data for visual tasks.

Op 23 september 2016 organiseren Simone van der Hof en Carel Smith het 5e Research Lab met als thema

Hoe kunnen studenten in mbo- en hoger onderwijsinstellingen het beste worden ondersteund in hun studiekeuze en studieloopbaan met het oog op soepele in- en doorstroom in opleiding en werk?

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Dit artikel wil een coherente basis bieden voor empirische studies naar interpersoonlijke discussies over risico's.