The aim of this thesis is to present novel techniques for proving cryptographic schemes secure against quantum adversaries. Most results are within the context of an idealized model called the ‘quantum random-oracle model’.

Samen met taal en lezen vormt rekenen het fundament onder het curriculum van de basisschool. Rekenen is een taal apart die leerlingen zich moeten eigen maken, namelijk de taal van getallen, hoeveelheden en patronen. Uit internationaal vergelijkingsonderzoek blijkt dat Nederland relatief weinig sterke…

Promotor: Prof.dr. H.S. Overkleeft

Promotor: A.H. Meijer, Co-promotor: B.E. Snaar-Jagalska

De onderzoeksgroep Digital Archaeology beheert twee computerlaboratoria voor verschillende doeleinden: een onderwijslab en een onderzoekslab.

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.

The main topic of this PhD thesis is the Arakelov ray class group of a number field, an algebraic object that contains both the ideal class group structure and the unit group structure.

De 21e eeuw is getuige van een revolutie in ons begrip van rationale punten op oppervlakken en hoger-dimensionale variëteiten, en het is binnen dit vakgebied dat dit project zich bevindt.

In this thesis we examine certain phenomena in symplectic topology which are related to the theory of isolated singularities.

Promotor: P. Stevenhagen, Co-promotor: R.M. van Luijk

In this work, I explore the creation of new methods that optimize simulations of the gravitational N-body problem. Specifically, I take advantage of the recent popularity of Machine Learning methods to find tools that can suit this problem.

The type-IV secretion system (T4SS) is a machinery able to transfer DNA and proteins between bacteria and in certain cases also to eukaryotic cells.

Promotor: Prof.dr.ir. E. Deprettere

One of the effects of climate change is the phenomenon of desertification, a process that occurs in semi-arid and arid areas and causes land degradation as well as vegetation loss. Due to the lack of resources, vegetation self-organizes to sustain itself by forming large-scale spatial patterns.

In this dissertation, matching, entropy, holes and expansions come together. The first chapter is an introduction to ergodic theory and dynamical systems.

Promotores: P. Stevenhagen, L. van Geemen Co-promotor: R.M. van Luijk

In this thesis, we explore a Hochschild homology and cohomology-like notion for logarithmic schemes.

Er worden verschillende activiteiten georganiseerd in het kader van het gastschrijverschap. Vast onderdeel is de Albert Verweylezing, die Giphart op donderdagavond 21 november 2024 zal houden. Op 11 september wordt Giphart geïnterviewd door Sander Bax en Rick Honings.

In this thesis we study products of linear error correcting codes.

We consider the propagation of electrical signals through nerve fibres.

Promotores: Arjen Doelman, Jens Rademacher, Max Rietkerk

Welke consumentengroepen hebben de grootste impact op de volksgezondheid en de planeet door hun voedingskeuzes, en hoe kunnen we deze inzichten gebruiken om de transitie naar duurzame eetpatronen te versnellen?

Actinobacteria are Gram-positive bacteria that have a complex multicellular life cycle and are well known for their ability to produce a wide range of bioactive natural products (NPs).

We study the interplay of topology and geometry with chirality for several passive and active systems, employing both analytical and numerical methods.

This thesis focuses on addressing four research problems in designing embedded streaming systems.

We are living in an information era where the amount of image and video data increases exponentially.

Promotor: Prof.dr. C.W.J. Beenakker

In the last decades, activity-based protein profiling (ABPP) has emerged as a powerful chemical tool that may aid the ever-challenging drug discovery process.

Less than 1 in 10 drug candidates that enter phase 1 clinical trials actually gets approved for human use.

Microglia support the central and peripheral nervous system by forming the first line of defense against hazardous events. Microglia are increasingly acknowledged as critical players in neurodegenerative diseases, highlighting them as potential therapeutic targets.

Discover the master program population Health Management at Leiden University and contribute to a more integrated health care system. Learn more!

This thesis examines the impacts and challenges of water use of electric power system. This thesis found that there are large differences in water use of electricity technologies, with hydropower and thermal power being two large water users.

The RNA guided endonuclease based on the CRISPR/Cas system of Streptococcus pyogenus is a potent new tool for genome engineering in plants.

Promotores: H. Schiessel, G.T. Barkema

This research delves into the unique cultural approach of the Tenggerese people, an Indigenous community in East Java, Indonesia, regarding elderly care. It focuses on their traditional practices of bakti (‘filial piety’) and sayan (‘mutual aid’), deeply ingrained in the community's lifestyle and va…

Cardiovascular diseases (CVDs) are the leading global cause of mortality. Endothelial dysfunction, an early reversible stage of CVD development, is marked by decreased nitric oxide production linked to Ca2+ influx in endothelial cells.

International trade has played a major role in defining the modern global economy. Trade, however, entangles the environmental pressures of economic sectors, giving the illusion of environmental improvements, while the opposite may be occurring.

Promotores: R. Cramer, A.K. Lenstra, Co-Promotor: B.M.M. de Weger

Promotor: R. Cramer

Promotor: Ronald Cramer, Co-promotor: Serge Fehr

Fundamental research in the ALgebra, Geometry And Number Theory

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.