In de jacht op nieuwe deeltjes doorzoeken natuurkundigen botsingen bij steeds hogere energie, waarbij ze de energiefrontier telkens een stukje verleggen. Sommige deeltjes laten zich echter moeilijk vangen omdat ze zeldzaam interactie vertonen; niet vanwege een hoge energie. Dit werpt een nieuwe barrière…

Wat is donkere materie? Hoe ontstaan superzware zwarte gaten? ‘Oer’-zwarte gaten bevatten wellicht het antwoord op deze langlopende vragen. Leidse en Chinese kosmologen hebben nu een nieuwe manier gevonden waarop deze hypothetische hemellichamen kunnen ontstaan vlak na de oerknal. Publicatie in Physical…

Een elastische doek over een kom die de ruimte voorstelt, een knikker die op het oppervlak een kuiltje veroorzaakt en zo de ruimte vervormt. Eenvoudige klasexperimenten zoals deze zijn te zien in nieuwe educatieve video's van AstroEDU. In de video's leggen de Leidse astronomen Maria Cristina Fortuna…

Promotor: K.E. Schalm, Co-promotor: S.S. Lee

Promotor: K. Kuijken, Co-Promotor: H. Hoekstra

This thesis describes a study from both a theoreticaL and an experimental point of view.

Tin electrodeposition applications have rapidly evolved in the past 25 years.

Green hydrogen is produced via a process called water electrolysis. During electrolysis water is split into oxygen and hydrogen.

To limit the effects of climate change, global average temperature since pre-industrial measurements are to be kept well below 2 °C preferably even at 1.5 °C.

Solar energy is used by photosynthetic organisms to drive energy required cellular processes. Is absorbed by two groups of pigments, located in the LHCs.

Following the Big Bang, structure in the Universe started collapsing under the force of gravity. This resulted in the formation of the first stars, galaxies and clusters of galaxies.

One of the most important correlation functions in physics, especially in cosmology, is the energy density, which describes how much energy is present at each point in spacetime due to matter fields. A key contribution to the energy density of the primordial universe comes from gravitational waves (GWs),…

Inspired by natural photosynthesis, perovskite-based photoelectrochemical (PEC) systems are being developed for artificial photosynthesis, aiming to enhance solar-to-hydrogen conversion for green energy.

We find ourselves in an era of transition, not just towards a more computing- and data-driven society but also away from unsustainable fossil fuels as an energy source.

Heterogeneous catalysis is one of the fundamental processes of modern life, being common in industrial refinery and hydrogen vehicles, all the way to the living cell. The dissociation of H2 on Cu(111) is an important benchmark system for studying heterogeneous catalysis, with a large and varied amount…

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

To meet the rising demand for minerals driven by the global shift to clean energy technologies, ensuring responsible and resilient supply chains is critical. Minerals like cobalt, lithium, and nickel for batteries, neodymium and zinc for wind turbines, and indium for solar panels are essential.

Overzicht van de voornaamste onderzoeksprojecten van het Leids Papyrologisch Instituut.

Vierhonderd wetenschappers en afgevaardigden van de ruimtevaartindustrie uit 14 landen komen deze week bijeen in Leiden voor de jaarlijkse Euclid Consortium-meeting. Euclid is de Europese ruimtetelescoop die in 2020 wordt gelanceerd en is bedoeld om misschien wel het grootste mysterie van de hedendaagse…

In dit indringende zelfportret uit circa 1629 presenteert Rembrandt zich als een aristocratische jongeman. Rembrandt schreef zich in 1620 in als letterenstudent aan de Leidse universiteit. Het is onbekend of hij daadwerkelijk naar college ging. In zijn schilderijen en prenten verwerkte hij veel onderwerpen…

Deze master specialisatie behandelt een breed scala aan wetenschappelijke onderwerpen, waaronder High Energy Physics and Particle Cosmology, Theoretical Physics of Life Processes en Condensed Matter Theory.

The LUGO Press is a student publication forum, rooted in academia and journalistic practices and published by the Leiden University Green Office.

Natuurkundigen, onder wie de Leidse Dorothea Samtleben, bouwen aan een reusachtige onderwatertelescoop om de oorsprong van neutrinos te ontrafelen en het mysterie rond donkere materie op te helderen. De eerste detector is inmiddels geïnstalleerd. Eenmaal af heeft de telescoop het volume van drie kubieke…

Promotor: Prof.dr. E. Bouwman

The adsorption of D2 and CO2 on catalyst surfaces is studied using a molecular beam in ultra-high vacuum.

Promotor: Huub J.M. de Groot, Co-promotor: Francesco Buda

Climate change is a challenge for both current and future generations. New biological resources have to be developed in order to meet the demand for energy as well as the demand for food.

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.

Promotores: A.P. IJzerman, H.W.T. van Vlijmen

Understanding how nature captures and transfers solar energy is essential both for elucidating biological photosynthesis and for guiding the design of artificial light-harvesting systems.

To design the ideal water oxidation catalyst, understanding of the catalytic mechanism and decomposition pathways is essential.

The electrochemical hydrogenation reaction is an alternative approach for the transformation of unsaturated bonds without the use of flammable dihydrogen gas.

This thesis highlights the significant role of surface geometry and oxidation state in determining CO adsorption behavior on copper surfaces.

Promotor: H.J.M. de Groot

Wat heb je aan fundamentele wetenschap? Veel, zo bewijzen de sprekers tijdens Science Matters. Dit symposium werd op 18 maart 2016 gehouden ter ere van het tweehonderd jarig bestaan van de Faculteit der Wiskunde en Natuurwetenschappen.

This thesis focuses on the design and synthesis of activity-based probes and inhibitors targeting enzymes involved in the degradation of specific plant glycans.

Promotor: A. Achúcarro, Co-Promotor: G.A. Palma

Promotors: Prof.dr. E. Bouwman, Prof.dr. E. Drent

Light-Harvesting Complex II (LHCII) is responsible for light absorption and excitation energy transfer in plants and photosynthetic algae, while in high light it undergoes conformational changes by which it quenches excitations to prevent photodamage.

In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.

A plasma is an ionized gas with very low electrical resistivity. As such, magnetic field lines are 'frozen in' and move with the fluid. Magnetic field lines that are linked, knotted and tangled, cannot be undone by the fluid motions.

Photocatalysis has emerged as a powerful tool for enabling challenging transformations in organic synthesis. This thesis explores the development of several photocatalytic reactions designed to form carbon-heteroatom bonds from less-functionalized precursors.

This dissertation was to develop effective graphene-based nanofluidic devices by developing scalable fabrication methods and elucidating proton transport mechanisms.

Molecular complexes can be used as electrocatalysts for oxygen reduction, water oxidation, and/or hydrogen peroxide production.

In eight chapters, the thesis of Rafaël Vos covers the effect of temperature and pressure on the electrochemical CO2 reduction.

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