In this dissertation iron-based homogeneous catalysts were synthesized, characterized and investigated for water oxidation activity.

Electrocatalysis allows for storing electricity or converting it into chemical bonds, producing chemical building blocks and fuels using renewable resources.

Anthropogenic noise has been shown to affect marine animals in various ways, this may have fitness consequences at individual and population level. This thesis aims to increase insight into the quantification of sound-induced behavioural responses that are relevant to fitness, and into factors that…

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.

The electrochemical oxygen reduction reaction (ORR) is an essential half-reaction for the utilization of hydrogen as a sustainable fuel, via the conversion of hydrogen to electrons and protons facilitated by the ORR. In the most common fuel cells, the ORR is requires high loadings of non-abundant platinum…

Electron microscopy has become an extremely important techniquein a wide variety of elds.

This thesis focuses on the X-ray spectral analysis of merging galaxy clusters and the plasma code development for future high-resolution X-ray spectroscopy observations.

Promotor: M.T.M. Koper, Co-promotor: J.B.F. Juurlink

I have studied the hot, diffuse gas around and between galaxies. Specifically, I have used the EAGLE numerical simulations of galaxy formation to predict the properties of this gas, and I have used those properties to predict specific observables: soft X-ray absorption and emission lines.

In this thesis we study the landscape of gravitational models which modify GR by introducing an additional scalar degree of freedom (d.o.f.) to source Cosmic Acceleration.

Food waste is a defining inefficiency of the modern food system, with profound implications for resource use, climate change, and circular economy transitions. This dissertation examines food waste through two complementary lenses: the prevention of avoidable food waste and the valorization of unavoidable…

Producing green energy has become the main goal in our society in the search of reducing or eliminating the carbon emission from fossil fuels.

Radiography is an important technique to inspect objects, with applications in airports and hospitals. X-ray imaging is also essential in industry, for instance in food safety checks for the presence of foreign objects.

Sustainable energy from wind and solar is most readily available near the sea.

In multi/many-core System-on-Chips (SoCs), the performance is almost linearly scaling with the number of processing elements.

The redox-conversion reaction of metal-disulfide and metal-thiolate complexes are important, as they may shed light on electron-transfer reactions that often occur in Nature.

In this thesis, we develop a novel technique called Optical Near-field Electron Microscopy (ONEM), which aims to combine the advantages of both optical and electron microscopy: the high resolution of electron microscopy and the low sample damage of optical microscopy.

In the first part of this thesis we study the geometry of folding patterns.

What physics controls the properties of quantum matter, such as how electrons flow inside high-temperature superconductors? This question has captivated the physics community and industry for decades, in part due to the great technological potential such materials have, but also because they have resisted…

This thesis addresses the challenge of sustainable urban development by analyzing the interplay between green and grey infrastructure to optimize resource use and ecosystem services.

This thesis investigates catalytic reactions at the atomic scale using scanning tunneling microscopy (STM), with a focus on Fischer–Tropsch synthesis, a key industrial process that converts hydrogen and carbon monoxide into liquid fuels.

De abortuswetgeving in de Verenigde Staten staat op het punt om strenger te worden. In het radioprogramma OVT vertelt universitair docent Sara Polak waarom abortus zo’n belangrijk politiek thema is geworden.

In 2050 moet de overstap naar nieuwe, duurzame energiebronnen zijn voltooid. Wetenschappers van de Universiteit Leiden verrichten vanuit diverse disciplines uniek onderzoek dat bijdraagt aan deze transitie en de reductie van CO2.

The work described in this thesis focuses on the development of linear or cyclized peptide probes against protein N-methyltransferases to characterize their specific binding behavior, providing further binding details for inhibitory activity study.

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’.

In this top-rated course, you will learn how the European Union prepares and decides on policy, and how policy is transferred to member states and implemented by various authorities. It discusses the challenges of the European multi-level governance structure and the main causes of policy failure or…

This thesis attempts to interrogate post-1991-2015 political development in Ethiopia, focusing on the political discourses espoused by the government and opposition, using the discourse analysis method and securitization theory.

Overzicht van de vacatures bij de afdeling Economie.

Lezing

Donkere materie. Onzichtbaar spul wat volgens berekeningen zo’n 85% van de materie in het heelal omvat. Met een ERC Advanced Grant van 2.5 miljoen euro gaat Hoogleraar Observationele Kosmologie Henk Hoekstra nog preciezer in kaart brengen waar deze donkere materie zich bevindt.

The thesis mainly contributes to the characterization of Majorana fermions as they appear in the Condensed Matter context.

De Leiden Teachers’ Academy organiseert jaarlijks een symposium over onderwijsvernieuwing aan de Universiteit Leiden.

Subproject of the ERC project 'Challenging the Liberal World Order from Within: The Invisible History of the United Nations and the Global South'.

De Tweede Kamer vraagt om advies van de Raad van State over het combineren van het Tweede Kamerlidmaatschap met een post in het kabinet. Dat wijst er volgens Boogaard op dat Nederland toegroeit naar een constitutioneel hof.

Er is een nijpend tekort aan medicijnen. Volgens onderzoek van NRC is bijna één op de zeven Nederlandse patiënten aangewezen op geneesmiddelen uit het buitenland. Promovendus Koosje van Lessen Kloeke sprak over dit tekort met Mr.: ‘De Nederlandse geneesmiddelenwetgeving rammelt.’

For questions and suggestions regarding the series, please contact prof. dr. Olaf van Vliet or dr. Max van Lent

Lecturer Andrew Gawthorpe of Leiden University discusses in The Conversation the growing influence of far-right activist Laura Loomer in Donald Trump’s administration.

In surface science there is great effort to move from studying simple, flat model surfaces in vacuum to investigating more complex model catalysts in gas environments (in situ). This thesis gives three examples of such studies using microscopy and spectroscopy.

Promotor: Prof.dr. G.J. Kroes

Dit proefschrift gaat over theoretische oppervlakte chemie binnen het veld van de heterogene katalyse.

Hydrogen peroxide (H2O2) is an important bulk chemical that is used in various industrial processes. More than 95% of the H2O2 used in industry is made via the anthraquinone process during which a large amount of energy is going to waste.

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

Electrons in a crystal lattice have properties that may differ from those of a free electron in vacuum.

Microbial rhodopsins are photosensitive pigments implemented in the growth and adaptation of a large population of microorganisms.

Computers worden steeds krachtiger en krijgen steeds ingewikkelder taken. Het Leiden Institute of Advanced Computer Science (LIACS) doet baanbrekend wetenschappelijk onderzoek en past nieuwe vindingen toe in actuele maatschappelijke vraagstukken.

Hoe kunnen we een balans vinden tussen de soms tegenstrijdige belangen van individuele, publieke en private data-producenten en –verwerkers?