Promotor: R. Cramer

Promotor: Prof.dr. G.R. de Snoo, Co-promotor: R. Heijungs

Majorana fermions in superconductors are the subgap quasiparticle excitations that are their own antiparticles.

Promotores: Prof.dr. B.R. Katzy, Prof.dr. K. Sailer (Munich University)

Promotores: J.C. van Houwelingen, S.A. van de Geer

Galaxies in the local Universe fall into two main categories of spirals and ellipticals. In this Thesis, we explore the structural evolution of galaxies into this bimodal distribution.

Mycorrhizas are symbiotic associations between soil fungi and most plant species.

In astronomy, the interpration of observations and measurements plays a crucial role: we rely purely and fundamentally on the information that reaches us as observers. And 80% of all matter in the universe is undetectable directly.

Understanding the formation and evolution of planetary systems is one of the most fundamental challenges in astronomy. To directly image and study young exoplanets and the circumstellar disks they form from, dedicated high-contrast imaging instruments are built.

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

Promotor: Prof.dr. A.G.G.M. Tielens

Tin electrodeposition applications have rapidly evolved in the past 25 years.

Promotores: Prof.dr. G.W. Canters, Prof.dr. T.J. Aartsma

Promotor: Prof.dr. I.A.G. Snellen, C.U. Keller

Galaxies form and evolve through close interaction with their surroundings. As a result, the heavy elements ('metals') that are synthesized in stars, are found both inside and outside galaxies.

Promotor: J.W.M. Frenken

The way organisms develop from the initial single-cellular state to a complex final assembly like the human body, and how the final body is maintained throughout life, is one of the greatest mysteries and it’s understanding one of the biggest scientific challenges.

Promotor: Prof.dr. E.F. van Dishoeck

Novel entities may pose risks to humans and the environment. The small particle size and relatively large surface area of micro- and nanoparticles (MNPs) make them capable of adsorbing other novel entities, leading to the formation of aggregated contamination.

Heterogeneous catalysis is one of the fundamental processes of modern life, being common in industrial refinery and hydrogen vehicles, all the way to the living cell. The dissociation of H2 on Cu(111) is an important benchmark system for studying heterogeneous catalysis, with a large and varied amount…

The invention of neural networks marks a critical milestone in the pursuit of true artificial intelligence. Despite their impressive performance on various tasks, these networks face limitations in learning efficiently as they are often trained from scratch.

Promotor: J. Zaanen, Co-Promotor: V. Juricic

Hydrodesulfurization (HDS) is an ubiquitous part of oil refining that ensures that fuels are cleaned of impurities and environment release of pollutants such as SOx and NOx gasses are minimized.

My work focuses on a class of astronomical objects called protoplanetary disks.

The main focus of this thesis is the behaviour of two-dimensional materials, namely (anti)-ferromagnetic materials in the first two chapters, which show topological phases, and energetic square ice in the third and fourth chapter.

At the largest scales, two ingredients dictate the distribution of matter in the Universe. The first is dark matter, acting as an invisible scaffolding held together by gravitational forces.

Despite the history of studies on methanol formation from CO2, the dominant elementary reaction steps that constitute the chemical mechanism for this catalyzed process are not determined.

Innovation plays an essential role in firms' competitiveness and long-term success. It varies from different types, ranging from run-of-the-mill innovation that brings incremental changes to existing technologies to radical innovation that breaks from existing trajectories.

In this thesis I highlight the applications of Oxford Nanopore Technologies (ONT) sequencing. This technique is a relatively new approach in the sequencing field, where nanopores are embedded in a membrane, DNA molecules are pulled through nanopores and an electrical current serving as the sequencing…

Lezing, Studium Generale

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…

Whilst government’s ability to design ‘context-specific’ regional innovation policy is generally assumed to depend on the region’s decision-making power, the aim of this study is to investigate how regional government matters. In order to open up the black box of policy design, the study develops a…

Planten zou je kunnen zien als kleine chemische fabrieken, die via fotosynthese chemische stoffen produceren. Als we fotosynthese kunnen nabootsen in een kunstmatig systeem, kunnen we schone brandstoffen en materialen maken uit zonlicht en CO2. Huub de Groot is heel dicht bij het ontwerpen van zo’n…

Organisaties als de EU leveren lidstaten soms enorm veel op, zonder dat inwoners van de lidstaten dat weten. Leidse wetenschappers onderzoeken hoe effectief samenwerkingsverbanden van lidstaten, zoals de EU of ASEAN, zijn bij het uitoefenen van invloed op de wereldpolitiek.

Alumni-activiteit

Het mededingingsrecht zorgt ervoor dat bedrijven op een eerlijke wijze concurreren. De Nederlandse Autoriteit Consument & Markt (ACM) handhaaft het mededingingsrecht in Nederland en kan bedrijven die oneerlijk concurreren bestraffende en herstellende maatregelen opleggen. Deze bedrijven hebben, wanneer…

Wil je Oost-Azië echt begrijpen, dan kun je niet om Korea heen. Bij Koreastudies in Leiden leer je niet alleen de Koreaanse geschiedenis, cultuur en taal, maar ook de hedendaagse Zuid-Koreaanse film- en popcultuur, maatschappelijke en politieke ontwikkelingen, en de inter-Koreaanse relaties komen ruim…

Wil je Oost-Azië echt begrijpen, dan kun je niet om Korea heen. Bij Koreastudies in Leiden leer je niet alleen de Koreaanse geschiedenis, cultuur en taal, maar ook de hedendaagse Zuid-Koreaanse film- en popcultuur, maatschappelijke en politieke ontwikkelingen, en de inter-Koreaanse relaties komen ruim…

The ultimate goal of cosmologists is to find a cosmological model able to explain the current observational data.

Promotores: Prof.dr. J. Zaanen, Prof.dr. K.E. Schalm

Promotor: Ronald Cramer, Co-promotor: Serge Fehr

Remus Dame

In this thesis, the research focuses on the properties of dark matter and dark matter haloes and how they connect with the galaxies we can observe in the Universe.

Promotores: H.W. Lenstra, K. Belabas (University of Bordeaux)

This thesis investigates how galaxies form and what diversifies the evolutionary histories of galaxies.

The development process of any software has become extremely important not just in the IT industry, but in almost every business or domain of research.

This PhD-thesis analyses the relationship between the parties’ choices in the CPB Netherlands Bureau for Economic Policy Analysis’ assessments of the election manifestos and coalition agreements over the period 1986-2017, and tries to explain this relationship.

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.

Over the last three decades, the discovery of exoplanets has revealed the boundless variety of worlds beyond our own Solar System⁠. Majority of planetary systems contain short-period planets that are larger than Earth but smaller than Neptune⁠.