Promotor: Prof.dr. M. de Jong

Learning about My meaningful Way through life and profession.

Leiden My Way is een co-curriculair persoonlijk ontwikkelprogramma uitgevoerd aan de Faculteit der Sociale Wetenschappen.

The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.

Promotor: P. T. de Zeeuw, Co-promotor: N. Neumayer; G. van de Ven

Promotor: K.H. Kuijken

The Sun and all the stars in the night sky reside in the Milky Way galaxy. In the at-rest reference frame of the Galaxy, typical stars travel with velocities of about 100-200 kilometres per second.

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

Op 29 april 2020 verdedigde Beth Van Schaack haar proefschrift 'Imagining Justice for Syria: Water Always Finds Its Way'. Het promotieonderzoek is begeleid door promotor prof.dr. C. Stahn.

Promotor: Prof.dr. H. J. A. Röttgering, Co-Promotor: M. Haverkorn

Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown

The formation of stars and planets happens over multiple scales, which can interact. In particular, planet formation happens in the dense, complex environment of star forming regions.

In this project, researchers from computer science, law, psychology, and public administration research in practice how artificial intelligence (AI) can be leveraged to make decision-making in the security domain more effective, while also keeping it safe and accountable.

Promotores: G. Persoon, R. Schefold

Shape and biological function are tightly connected. Physical descriptions are used to connect the shape of a biological system with its function.

Promotor: Prof.dr. P. Stevenhagen, Co-promotor: B. de Smit

Promotor: J. Zaanen

We show that Kirchhoff ’s law of conservation holds for non-commutative graph flows if and only if the graph is planar. We generalize the theory of (Euclidean) lattices to infinite dimension and consider the ring of algebraic integers as such a lattice.

A brief review essay on some of the work that has been recently published in the emergent field of digital ethnography.

Promotores: G.R. de Snoo, W.T. de Groot, Co-promotor: C.J.M. Musters

Humans can see the world through the eyes of other humans and imagine what they know, want, and intend. This competence is known as Theory of Mind.

This thesis is a (biased) journey through very different topics in astrophysics: quasars and new populations of active galactic nuclei, gravitational waves from merging black holes, and protoplanetary discs around young stars.

For centuries astronomers studied the Universe by collecting light. Nowadays, we are living in times of great technological advancements, which allow us to explore our Universe in a new way - though gravitational wave radiation.

A management strategy has been developed for field margins to reduce pesticide drift to non-target areas and to promote biodiversity on arable land. To this end, 3 and 6 m wide strips along the edges of winter wheat, sugar beet and potato crops have been left unsprayed with herbicides and insecticides…

In this thesis, the role of plant-mediated soil legacy effects in shaping aboveground plant-insect interactions was investigated.

Understanding how galaxies form, interact, and evolve comes largely from comparing theory predictions with observational data. Numerical simulations of galaxies provide the most accurate approach to testing the theory, as they follow the non-linear evolution of gas and dark matter in great detail and…

Promotores: Prof.dr. H Lenstra, Prof.dr. A Facchini (Padova University)

This thesis is comprised of three chapters covering the theme of studying semistable varieties by looking at their dual combinatorial objects.

Human language is constantly evolving with its linguistic structure being shaped by language users at both individual and population levels. Focusing on the interplay between processes of language acquisition and communicative need in shaping human languages, this thesis introduces a novel computational…

In the early universe, the dynamics of the Higgs field can give rise to many interesting phenomena.

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?

Over the last decades, aviation safety has improved strongly. As a downside, airline pilots do not have as many opportunities to develop through experience the competencies that they need in critical situations.

The marine shipping industry is one of the strongest emitters of nitrogen oxides (NOx), a pollutant detrimental to ecology and human health. Over the last 20 years, the pollution produced by power plants, the industry sector, and cars has been decreasing.

Promotor: Prof.dr. P. Stevenhagen

Tuberculosis is a major global health problem caused by the Mycobacterium tuberculosis complex, claiming more than a million lives annually.

Promotor: Prof.dr. D. Bouwmeester

Op vrijdagavond 17 september is de Leidse astronoom Joe Callingham te zien in een nieuwe serie op Discovery. ‘Killers of The Cosmos’ gaat over krachten in het heelal die ons bestaan kunnen bedreigen. Asteroïden, kosmisch puin, elektromagnetische wapens… De show behandelt elke bedreiging als potentiële…

Promotor: Prof.dr. G.P. van Wezel

The external tissues of plants and animals are colonized by microbial communities termed microbiota. When organisms are exposed to environmental pollutants, these substances will therefore encounter microbiota at the exposure interface.

Pharmaceutical companies, governments and the general public have become increasingly aware that animal models used in drug testing lack vital aspects to serve as an accurate representation of human biology. As models of the human body should become more physiologically relevant, animal models no longer…

Promotor: M.K. Richardson, Co-Promotor: F. Witte

Despite being the object of intense study, embryonic development has been difficult to model due to a number of reasons. First, complex tissues can be comprised of many cell types, of which we probably only know a subset.

Promotor: J.M. van Ruitenbeek, Co-Promotor: S.J. van der Molen

Artful Mathematics: The Heritage of M. C. Escher

This thesis deals with properties of Jacobians of genus two curves that cover elliptic curves.

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…

Kunst en vrije tijd, Kunst en vrije tijd

Jasmina Mačkić, universitair docent aan het Europa Instituut, presenteerde haar onderzoek tijdens ‘The Dissident’, een live talk show die regelmatig wordt georganiseerd door World-Talks, op 24 mei 2018. De bijeenkomst draaide om de Nigeriaanse mensenrechtenactivist Justus Ijeoma, de oprichter van de…

In het programma Time Warp brengt bioloog Freek Vonk de gevaarlijkste gifslangen ter wereld voor de camera. Zijn doel is niet het tonen alleen, maar vooral het melken van het slangengif ten behoeve van zijn promotieonderzoek. Vrijdag vertelde hij over zijn fascinatie voor slangen in 'De Wereld Draait…

Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems.