Promotor: Prof.dr. J. Zaanen, A. Parnachev

How can we quantify the density of species within a community through environmental DNA concentrations?

This thesis provides explicit expressions for the density functions of absolutely continuous invariant measures for general families of interval maps, that include random maps and infinite measure transformations, not necessarily number systems.

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

Promotor: S.M. Verduyn Lunel, Co-promotor: S.C. Hille

Leiden University always follows the health advice of the National Institute for Public Health and the Environment (RIVM) and the travel advice of the Ministry of Foreign Affairs.

What tools can be applied to measure the output, outcome and impact of science communication efficiently and effectively?

Human activity, such as pollution, may disturb the balance of living water systems, which has consequences for biodiversity, but also for other functions such as water purification. Leiden University maps living water systems using the most advanced technologies.

The subject of this thesis, ‘Approach to Markov Operators on Spaces of Measures by Means of Equicontinuity’, combines an analytical and probabilistic approach to Markov operators.

Sarah Giest and Annemarie Samuels, both Assistant Professors at Leiden University, researched the quality and coverage of the data being collected for policiymakers to be used, specifically pertaining to minority groups.

Legal scholars and professionals are confronted with a rapidly increasing volume of legal publications. Only part of these publications are relevant enough to be cited. This project aims to determine which documents that are, and whether alternative metrics are a reliable way to predict whether documents…

Promotie

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SMR can be used to measure the mass of adsorbed protein to nanoparticles with a high precision in the presence of free protein.

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.

Galikyan’s dissertation examines how the multidimensionality of learner­learner interaction data and the multifacetedness of learner-learner interaction itself impact the measurement of learner-learner interaction in digital learning environments.

In science, it is of vital importance that multiple studies corroborate the same result. Researchers therefore need to know all the details of previous experiments in order to implement the procedures as exactly as possible. However, this is becoming a major problem in neuroscience, as animal studies…

Light obscuration (LO) is the current standard technique for subvisible particle analysis in the quality control of parenterally administered drugs, including therapeutic proteins.

Promotor: Prof.dr.ir. J.W.M. Hilgenkamp, Prof.dr. J. van den Brink

Intensive public debates have erupted about integration of immigrants in Europe. The influx of refugees from the middle east during the summer and autumn of 2015, the increasing visibility of immigrants throughout European societies, but also the widely publicized occurrences on New Year’s eve in Cologne…

Promotores: F.H.J. Redig, W.T.F. den Hollander

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

Development and validation of instruments that can measure different aspects of emotional competence in children with normal and atypical development, and in different cultures

Promotie

On 29 January 2019, Robbert van Eijk defended his thesis 'Web Privacy Measurement in Real-Time Bidding Systems, A Graph- Based Approach to RTB system classification'. The doctoral research was supervised by Prof. dr. H.J. van den Herik.

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

Promotor: G. J. Kroes

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.

A semi-empirical version of the specific reaction parameter approach to density functional theory (SRP-DFT) has been remarkably successful at predicting dissociative chemisorption probability vs. incidence energy curves for reactions on metal surfaces. New quantum Monte Carlo (QMC) calculations on the…

Promotor: G.A. van der Marel, Co-promotor: J.D.C. Codée

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This projects investigates spatial relations between soils and other resources and the urban layout of a classic Maya center in Campeche, Mexico.

Promotor: J.P. Abrahams, Co-Promotor: N.S. Pannu

Seagoing vessels may emit fewer and fewer harmful substances, but how do you measure whether they comply with the standards? The Dutch Environment and Transport Inspectorate (ILT) and the universities of Leiden and Wageningen are starting a joint study to detect the emission of sulfur and nitrogen dioxide…

On Friday, December 15th, Prof. Kevin Davis, Beller Family Professor of Business Law at NYU School of Law will, on the basis of his own research, reflect on whether, and if so how, we can measure law and legal phenomena.

There is a lot of measuring going on in mental healthcare, but not enough use is being made of the information from these measurements. This is what Edwin de Beurs concludes in his inaugural lecture ‘Measuring, knowing and then what?' on 27 November. The professor by special appointment of ROM and Benchmarking…

In this thesis we use Josephson and noise scanning tunneling microscopy for the study of conventional, unconventional (iron-based) and disordered superconductors. On the one hand, Josephson scanning tunneling microscopy allows us to directly visualize the superfluid density with high spatial resolut…

It's one of the big cosmology debates: the universe is expanding, but how fast exactly? Two available measurements yield different results. Leiden physicist David Harvey adapted an independent third measurement method, using the light warping properties of galaxies predicted by Einstein. He published…

This thesis describes the use of a combined approach of computational and experimental techniques to gain novel insights to understand the glycosylation reaction and its reactive intermediates.

Promotoren: R. Tijdeman, A.K. Lenstra, Co-promotor: H.J.J. te Riele

Promotor: G.R. de Snoo

Proteins organize themselves around our body cells through a self-induced force. They indent the cell membrane, which makes them roll towards each other. This discovery provides new insights into processes like nutritional uptake and brain signaling, as well as into such diseases as Alzheimer’s. Publication…

Leiden astronomers and ecologists are developing an instrument that lets people measure the quality of surface water with a smartphone.This international citizen science project, MONOCLE, is a collaboration between scientists and local people in Tanzania, Brazil and four European countries.

Easily detecting chemical substances that indicate whether or not someone is ill, or measuring how healthy the environment is, and directly linking that result to that person. In a nutshell, this is what researchers within the Dutch National Research Agenda (NWA) want to achieve in the ‘Measuring and…

In the search for sustainable energy solutions, the idea of artificial photosynthesis has been proposed as an approach with which to use water and sunlight to produce hydrogen.