Metals surfaces form a group of effective catalysts for the reaction of small molecules such as hydrogen (H2).

Ice, the solid state of water, plays an important role on our planet as well as the entire universe.Despite the fact that an individual water molecule has a very simple structure, its chemical bonding in the solid phase can be surprisingly complex.

Organic molecules in interstellar space are important as they influence the structure of galaxies and star formations. Studying catalytic processes in space allows us to understand how molecular species are formed and chemically evolved in the interstellar medium and solar system objects.

This dissertation focused on computational methods based on first principles calculations using the Density Functional Theory (DFT) framework. Emphasis was laid on affordable methods that can provide a tradeoff between computational expense and accuracy.

In this thesis, we consider various (electro)chemical phenomena at surfaces and nanoparticles and their underlying atomistic processes, which we studied using first-principles methods such as density functional theory.

Fundamental understanding of molecular reactions on metal surfaces is important for improving heterogeneous catalysis.

Dissociative chemisorption is an important reaction step in many catalytic reactions.

Promotor: G. J. Kroes

Promotores: J. Zaanen, A. Parnachev

Biodiversity enables ecosystems to thrive through the synergy of functional differences among organisms. While human well-being strongly depends on biodiversity-driven ecosystem services, human actions are also at the root of current unprecedented biodiversity declines.

Promotor: Prof.dr. G.J. Kroes

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

Het onderzoeksprogramma Probability Theory richt zich op kansrekening en op operationeel onderzoek.

Promotor: K.E. Schalm, Co-promotor: S.S. Lee

Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.

Promotor: M.T.M. Koper, Co-Promotor: L.B.F. Juurlink

Promotor: H.W. Lenstra, Jr., Co-promotor: B. de Smit

This dissertation is a collection of four research articles devoted to the study of Kummer theory for commutative algebraic groups.

Promotor: S.J. Edixhoven, Co-promotor: R.S. de Jong

Het onderzoek binnen het Algebra, Geometry and Number Theory programma varieert van fundamentele wiskundige theorie tot algoritmes en toepassingen.

Promotor: Prof.dr. J.G.E.M. Fraaije, Co-promotor: A. Kros

In this thesis, time-lapse fluorescent microscopy plays a pivotal role in investigating functional materials within living cells as well as the migratory behaviour of neural progenitor cells.

Promotor: S.M. Verduyn Lunel

Catalysis is of extreme relevance in the production of everyday materials and plays a central role in many aspects of our life.

In de masterspecialisatie Algebra, Geometry and Number Theory verbreed je je kennis van de zuivere wiskunde met onderwerpen als getaltheorie, algebraïsche meetkunde, algebraïsche topologie en cryptologie.

De masteropleiding Cultural Analysis: Literature and Theory van de Universiteit Leiden richt zich op de studie van literatuur vanuit een vergelijkend en theoretisch perspectief, en onderzoekt de literatuur van een breed spectrum van talen en culturen uit de hele wereld.

My PhD research is devoted to studies of the conjectural cluster-algebraic symmetry in the theory of topological string, which is the simplest, however already non-trivial sector in the theory of string.

Due to their central physiological roles in living organisms, retaining beta-glycosidases have been the subject of tremendous research efforts to examine their structure/function relation using numerous biophysical and biochemical approaches.

In deze masterspecialisatie houd je je bezig met twee kernthema’s in de politieke filosofie: legitimiteit en rechtvaardigheid. Je verdiept je in theoriën, methoden en complexe casus en maakt de stap van opinie naar analyse.

Supervisor: P.J.J. Hooykaas

1: What is the relative importance of alfa and beta biodiversity in polar ecosystems, and how does intraspecific variation influence this? 2: How can we use remote sensing to determine functional biodiversity (within communities) in polar ecosystems? 3: Temporal and spatial scales of functional biodiversity:…

In deze studie onderzoeken we of 2-3-jarigen in staat zijn te anticiperen op het gedrag van een personage door rekening te houden met wat dit personage wel of niet weet over de situatie. Het kind zit op schoot en krijgt animaties te zien met twee personages, waarbij de ene zich verstopt en de andere…

Promotie

My PhD thesis investigates the ecological significance of resistance against drought-induced air bubble formation inside the water conduits of plants (embolism), and the plasticity and functional aspects of stem anatomical traits in woody and herbaceous species.

Promotor: J. Zaanen

In this work we describe three methods to improve the performance of Quantum Field Theory calculations.

Op 16 april 2020 verdedigde Andrew Fink zijn proefschrift 'The Importance of Conspiracy Theory in Extremist Ideology and Propaganda'. Het promotieonderzoek is begeleid door promotor prof.dr. A. Ellian.

During the course of drug discovery translational steps are made.

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.

The next generation of high-contrast imaging instruments on space-based observatories requires sophisticated wavefront sensing and control in addition to a high-performance coronagraph.

Kunst en vrije tijd, Kunst en vrije tijd

Promotor: P.J.J. Hooykaas, Co-Promotores: P.B.F. Ouwerkerk, M. Wang

Hoe kunnen we de mysteries van quantummaterie verklaren?

Geesteswetenschappen, Centre for the Arts in Society

Femke Bakker, Hawks and Doves: Democratic Peace Theory Revisited

This Thesis shows discoveries in non-linear astrochemical kinetics as well as a deeper analysis of dark clouds chemistry.

Promotor: E.F. Smets Co-promotor: J. Geml

Streptomyces present a valuable platform for natural product discovery. Lugdunomycin is a novel angucycline-derived polyketide from Streptomyces sp QL37, with unprecedented skeleton and antimicrobial activity.