This thesis describes the development and validation of new high-contrast imaging techniques, with the ultimate goal of enabling the next generation of instruments for ELT-class telescopes to directly image Earth-like extra-solar planets orbiting around nearby stars.

Large areas of space are filled by molecular clouds that consist of gas and dust grains that are the remnants of dead stars. When these clouds start collapsing, the decreasing temperature and increasing density cause gas particles to start accreting onto dust grain surfaces.

Plants are colonized by an astounding number of microorganisms that can provide different life-support functions, including nutrient acquisition and protection against (a)biotic stresses like drought or pathogen attack.

A sustainable resource management is an essential aspect to satisfy the current human needs without compromising the needs of future generations.

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

Promotor: G.P. van Wezel, Co-promotor: D. Claessen

Hot astrophysical plasma is ubiquitous in the Universe, from comets in our Solar system to the largest scale structures -- the cosmic web filaments. These hot plasmas, with the temperature of a few millions of degrees, are often observed in the X-ray wavelength range.

Anthropogenic noise negatively affects wildlife in a wide range of taxonomic groups.

This dissertation consists of two parts, each of which considers a different research area related to random interval maps. In the first part we are interested in random interval maps that are critically intermittent.

Heb jij interesse in een studie op het gebied van bestuur, politiek, internationale relaties, veiligheid, stedelijke ontwikkeling, globalisering of economie? Dan is studeren in Den Haag echt iets voor jou! Ontdek de Haagse opleidingen van de Universiteit Leiden die perfect aansluiten bij de thema’s…

Heb jij interesse in een studie op het gebied van bestuur, politiek, internationale relaties, veiligheid, stedelijke ontwikkeling, globalisering of economie? Dan is studeren in Den Haag echt iets voor jou! Ontdek de Haagse opleidingen van de Universiteit Leiden die perfect aansluiten bij de thema’s…

This thesis explores how bees and hoverflies are distributed across the Dutch landscape and how ecological and landscape factors shape their occurrence.

This thesis describes how to scale down concepts of macroscopic mechanical metamaterials to the thermal scale using a system of flexibly-linked colloids.

Lezing

The thesis addresses the long-term dynamical evolution of hierarchical multiple systems.

This dissertation presents a new perspective on the life, work and character of the Dutch physical chemist Jacobus Henricus van ’t Hoff, first recipient of the Nobel Prize in Chemistry, and one of the most important and colourful scientists in Dutch history. The image of Van ’t Hoff that emerges from…

S.S. Kolipaka’s thesis questions and investigates the survival prospects of reintroduced tigers and their offspring’s in the human dominated landscape of Panna tiger reserve in India.

A single self-assembled semiconductor quantum dot in a high-finesse optical microcavity - the subject of this thesis - is an interesting quantum-mechanical system for future quantum applications. For instance, this system allows trapping of an extra electron and thus can serve as a spin quantum memory,…

Machine Learning is becoming a more and more substantial technology for industry.

Over several decades, a variety of computational methods for drug discovery have been proposed and applied in practice. With the accumulation of data and the development of machine learning methods, computational drug design methods have gradually shifted to a new paradigm, i.e. deep learning methods…

The origin and evolution of galaxies are closely tied to the cyclic feedback processes between stars and the interstellar medium (ISM).

In recent decades, climate change has led to more frequent and severe drought events, causing serious consequences such as increased forest mortality and significant crop yield losses. Understanding how drought affects plants, especially economically important herbaceous species, is crucial for predicting…

Nanoparticles can be used as delivery systems for both small molecules and macromolecules such as proteins, peptides or oligonucleotides. This thesis focuses on the use of liposomes, nanometric vesicles formed by a lipid bilayer enclosing an aqueous core. Liposomes are highly versatile delivery syst…

Learning from small data sets in machine learning is a crucial challenge, especially when dealing with data imbalances and anomaly detection. This thesis delves into the challenges and methodologies of learning from small datasets in machine learning, with a particular focus on addressing data imbalances…

Promotor: Prof.dr. T. Schmidt, Co-Promotor: S.J.T. van Noort

CONSENT (Consumer sentiment regarding privacy on user generated content services in the digital economy) is a research project funded by the European Union under the 7th Framework Programme. The question central to this research is whether recent changes to consumer and commercial practices developed…

Promotor: T.J. Aartsma, Co-promotor: R.N. Frese

Bacteria often experience external challenges, such as changes in environmental conditions or attacks by bacteriophages.

In this work, we investigate the minute circular dichroism effects of single nanoparticles.To this aim, we apply photothermal imaging with a polarization-modulated heating beam.

Cholesterol influences many pathways, including serving as precursor for adrenal steroidogenesis. Imbalance of cholesterol levels has been implicated in several diseases including cardiovascular diseases and its underlying pathology, atherosclerosis.

Promotor: S.M. Verduyn Lunel, Co-Promotores: S.C.Hille, O.W. van Gaans

Nanodiscs are small, disc-shaped structures designed to mimic biological cell membranes, composed of a lipid bilayer stabilized by scaffold proteins. Membrane proteins play crucial roles in essential processes such as nutrient and waste transport, molecular recognition, and cell signalling, making them…

Soil is a home for an unbelievable diversity and abundance of microbial life that is essential for supporting life on our planet.

Detecting planets during their formation stages is crucial for understanding the history and diversity of fully developed planetary systems like our own. However, observing young planets directly is challenging because they are often deeply embedded within their host protoplanetary discs, rich in gas…

Leiden en Den Haag zijn echte studentensteden die van jouw studententijd een onvergetelijke tijd maken. Lees snel verder waarom.

Leiden is een echte studentenstad. Meld je aan voor een studievereniging of studentenvereniging om van jouw studietijd een onvergetelijke tijd te maken!

Studievoorlichting

Studievoorlichting

Studievoorlichting

Studievoorlichting

Promotie

The extensive use of electronic communication channels and other devices has opened new possibilities for collecting data on human behavior. This information is sometimes openly accessible, but largely part of administrative registration systems that are not open to the broader public. The data provides…

Kunst en vrije tijd, Kunst en vrije tijd

Studievoorlichting

Studievoorlichting

Workshop

Workshop

World Teachers Festival 2024 - Celebrating and exploring language, culture, diversity and criticality in teaching and learning

What is the optimal design of sandy solutions for sustainable climate change adaption, from an ecological, biophysical and societal point of view?