Humans share meaning through language. Over time, repeated interactions have shaped languages into forms that match our cognitive preferences, making them structured, expressive, easy to learn, and ultimately, meaningful.

For many system in statistical physics the microcanonical and canonical ensemble are equivalent in the thermodynamic limit, but not for all.

Stress komt veel voor in de huidige samenleving. Dit is zorgwekkend, aangezien onderzoek herhaaldelijk heeft aangetoond dat stress een negatieve invloed heeft op de lichamelijke gezondheid. Zo vergroot stress bijvoorbeeld de kans op hart- en vaatziekten.

In this thesis, several aspects of software debugging from automated crash reproduction to bug report analysis and use of contracts have been studied.

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In this thesis, we have used numerical approaches to study the effects of translational symmetry breaking on strange metallic systems as realised by the holographic duality⁠.

This thesis explores Breaking of Ensemble Equivalence (BEE) in random graph models by examining the spectral properties of adjacency matrices. The goal is to identify spectral characteristics that differentiate random graph ensembles, enhancing the understanding of complex network structures and beh…

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 Copenhagen interpretation of quantum mechanics states that a measurement collapses a wavefunction onto an eigenstate of the corresponding measurement operator.

Dit project onderzoekt de professionalisering van universiteitsbibliotheken in de negentiende en vroege twintigste eeuw, door de lens van het middeleeuwse handschriftenbezit. Met de Leidse Universiteitsbibliotheek als uitgangspunt werpt het licht op de veranderende praktijken rond het conserveren, behandelen…

Laboratory, observation and modeling work on the dissociation of polycyclic aromatic hydrocarbons in interstellar environments and the formation of new molecular species through the fragmentation process.

This research focuses on the distribution of chemical elements in protoplanetary disks, the birthplaces of planets. These disks form around young stars and contain gas and dust, from which planets grow. Ice plays a crucial role in planet formation, aiding the clumping of dust particles and influencing…

In dit onderzoek wordt hersenontwikkeling voor het eerst direct gelinkt aan sekseverschillen en schoolprestatie. De resultaten ontkrachten de mythe dat jongens achterlopen in hersenontwikkeling.

Het onderwerp van dit proefschrift is integratie van klinische kennis en kennis van de basisvakken in het medisch onderwijs en de rol die concept maps kunnen spelen in het expliciet maken van deze zogenoemde verticale integratie.

Striga hermonthica, commonly known as witchweed, infests major cereal crops in Sub-Saharan Africa causing severe yield losses and threatening the livelihood of millions of resource poor farmers.

Leiden University Centre for the Arts in Society (LUCAS) invites applications for a PhD position within the project ‘Libraries as Links in Learning: Making the Meaning of Manuscripts’ (1.0 fte, 4 years). The PhD candidate will track changing professional and scholarly practices and attitudes towards…

Hoe proberen verschillende actoren betekenis te geven aan terroristische aanslagen in het eerste jaar dat daarop volgt?

Presents a novel philosophical account of psychedelic experiences, arguing that they can be induced by means other than psychedelics — such as meditation and yoga.

Er zijn wereldwijd vele open (leer)materialen beschikbaar, maar deze worden nog niet of zeer beperkt gebruikt in het onderwijs.

Het Liliane Fonds en het Afrika-Studiecentrum van de Universiteit Leiden hebben de Impact Challenge Award 2019 gewonnen voor het project 'Breaking down barriers to exclusion. Building capacity for lobby and advocacy for children with disabilities'. De Impact Challenge Award is een nationale onderscheiding…

Promotor: W. T. F. den Hollander, F. H. J. Redig

Promotor: J. Zaanen

Promotor: P. J. J. Hooykaas Co-promotor: B. S de Pater

Increasing the efficiency of gene targeting (GT) as a genome editing tool in plants has been an important goal in plant biotechnology.

Almost three years after receiving her honorary doctorate, Dr Graça Machel returned to Leiden University. Over the course of two days she spoke with students, researchers, and other interested persons, about human rights – particularly those of women and children – in a world in which these are continually…

Quantitative biology means exploiting mathematical modelling and computer simulation as a tool to gain additional insights into the meaning of experimental data. Discover in this minor when and how to apply these tools, in a multidisciplinary setting.

Op maandag 19 mei 2025 organiseert Website Application Services van het ISSC in samenwerking met SC&M een Webinar Universitaire Website[s]. Tijdens dit online web event wordt je o.a. ge-update over diverse inhoudelijke zaken die voor jou als webredacteur belangrijk kunnen zijn! Ga via deze link…

Op maandag 19 mei 2025 organiseert Website Application Services van het ISSC in samenwerking met SC&M een Webinar Universitaire Website[s]. Tijdens dit online web event wordt je o.a. ge-update over diverse inhoudelijke zaken die voor jou als webredacteur belangrijk kunnen zijn! Ga via deze link…

Understanding DNA repair mechanisms is essential for advancing plant biotechnology and crop improvement. This study investigates how double-strand breaks (DSBs), induced by CRISPR/Cas systems, are repaired in the model plant Arabidopsis thaliana, and how these processes influence Agrobacterium tumefaciens…

Promotors: Prof.dr. J. Zaanen, Prof.dr.ir. H. Hilgenkamp

Systems with local constraints is a new finding in recent researches on complex systems. The heterogeneous spatial interactions and the temporal dependencies among those numerous units make it difficult to describe by traditional statistical physics.

Ontdek het studieprogramma van de éénjarige MSc Nederlandse Politiek aan Universiteit Leiden: kernvak, keuzevakken, onderzoeksvaardigheden, scriptiebegeleiding en stageoptie.

In this thesis, we study different curved single crystals because of the diversity of surface structures across their curvature.

This dissertation presents new cryptographic protocols, which can be divided into two families.

LCA has become an important method to study environmental impacts of human activities. Still, there are several methodological issues in LCA that can adversely affect the results reliability.

This course uses the lives, ideals and achievements of Theodore, Franklin, and Eleanor Roosevelt to create the idea of a Rooseveltian century. It is an invitation to think critically and historically, and it wants to give you a glimpse of what it means to be a historian at work.

Promotor: H.W. Lenstra

The complexity of an intelligence problem determines to a great extent the certainty that can be provided by intelligence and security services.

Groeiende gezondheidsverschillen, toenemende zorgkosten, de vergrijzing en het tekort aan zorgpersoneel zijn slechts enkele voorbeelden van uitdagingen waar de gezondheidszorg voor staat, zowel in Nederland als daarbuiten. Deze vraagstukken overstijgen de grenzen van de medische sector en raken aan…

Promotor: A.W. van der Vaart

From Incident to Precedent

Gold nanorods are biocompatible nanoparticles that present an excellent two-photon signal that can be used to get high spatial resolution inside living cells. Gold nanorods are photostable and therefore can be followed inside cells for long time, with possible applications as trackers in live cells.

Kunst en vrije tijd, Kunst en vrije tijd

This thesis deals with the use of sound in interactions in the context of participatory systems and data sonification. We investigate an interactive environment where participants perceive information of the data through sound elements.

The research presented in this thesis concerns one of the most important questions in software engineering of our time: how can we make sure that software is free from memory safety bugs?

This study has been carried out in the community of Sukamiskin, a kelurahan (‘village’) in Bandung, the Capital of West Java Province, located in the Sunda Region of Indonesia.

The intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters.

In this Ph.D. thesis we study the interaction of low energy electrons with thin materials, namely layered materials (graphene, hexagonal boron nitride, molybdenum disulfide) and organic films. At these low energies the quantum mechanical wavelength of the electron wave function is in the order of a…

An objective of this research was to achieve direct, well-defined and non-rate-limiting electron transfer between respiratory enzymes and the electrode surface by means of 'Q-wires'.