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

My work focuses on a class of astronomical objects called protoplanetary disks.

This thesis focuses on protoplanetary disks: flattened structures of gas and dust around young stars in which planets are expected to form and grow.

Promotores: Prof.dr. A.G.G.M. Tielens, Prof.dr. L.B.F.M. Waters (UvA), Prof.dr. C. Dominik (UvA)

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

The work presented in this thesis is based on ALMA surveys of protoplanetary disks in three star-forming regions: Lupus, OMC-2, and NGC 2024.

To study how planetary systems come into existence we study much younger systems still in formation.

Promotores: H.W. Lenstra, K. Belabas (University of Bordeaux)

To address the fundamental questions of how life on Earth emerged and how common life may be in the Universe, it is crucial to know the chemical composition of the planet-forming material.

Promotor: H.W. Lenstra

Planets are formed in disks of gas and dust around young stars.

This thesis examines the link between simple molecules and the underlying structure and chemistry within protoplanetary disks - the birthplaces of planets.

Promotor: Prof.dr. E.F. van Dishoeck

Promotores: Prof.dr. H Lenstra, Prof.dr. A Facchini (Padova University)

Promotor: Prof.dr. P. Stevenhagen

Promotores: Prof.dr. E.F. van Dishoeck, Prof.dr. C.P. Dullemond

This thesis addresses the chemical processes that determine the compositions of giant planet atmospheres.

The focus throughout this thesis will be on gathering fundamental studies of the detailed structure and composition of the electrode/electrolyte interface effect on the rate and mechanism of key electrocatalytic reactions.

Does the presence of Ring-necked parakeets negatively influence feeding and feeding behaviour of native bird species on artificial bird feeders and if so, what are possible solutions?

In this thesis we have discussed several parameters that affect the electrochemical conversion of enviromentaly harmful molecules such as nitrates and carbon dioxide to more valuable and less deleterious compounds, in order to cast light onto the mechanism of the reaction to achieve an efficient and…

When a star gets too close to a supermassive black hole, it is torn apart by strong tidal forces in a tidal disruption event (TDE).

Saturnus staat bekend om zijn ringen. Uit recente data van de ruimtesonde Cassini blijkt nu echter dat de planeet deze iconische ringen niet altijd heeft gehad. Leidse astronomen Yamila Miguel en Matthey Kenworthy reageren in verschillende media op de ontdekking.

Promotor: E. F. van Dishoeck, Co-promotor: C. Walsh

This thesis discusses the physical and chemical processes than influence the composition of forming planets.

Astronomen van onder meer de Sterrewacht Leiden hebben een ongebruikelijke begeleider ontdekt van een zeer jonge ster in het sterrenbeeld Orion. Dat grote object, mogelijk een planeet, schuift iedere 2,5 jaar voor de ster langs, waardoor het sterlicht met 20 procent wordt gedimd. Binnenkort verschijnt…

Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.

Jonge sterrenstelsels zijn minder rommelig dan verwacht en blijken ook al spiraalarmen, balken en ringen te bevatten. Dat stelt een internationaal team van onderzoekers onder leiding van assistant professor Jacqueline Hodge. De jonge, ver van ons vandaan staande sterrenstelsels waren tot nu toe wazige…

Sterrenkundigen uit onder andere Leiden hebben in Zuid-Afrika de eerste astronomische opnamen gemaakt met de door hen gebouwde bRing-camera. Deze camera zal een jaar lang gericht staan op de planeet die rond de ster Beta Pictoris draait, om te kijken of deze planeet een ringenstelsel heeft.

Promotor: Prof.dr. D. Bouwmeester, Co-Promotor: M.J.A. de Dood

Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.

Promotor: I. Snellen, Co-Promotor: M. Kenworthy

We investigate the buildup of galaxies from various vantage points. The first two chapters focus on the stellar content of galaxies, especially the distribution of stellar masses at birth and potential variations therein in various galactic environments.

In this thesis, we present new laboratory data of interstellar dust analogues.

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

An objective of this research was to achieve direct, well-defined and non-rate-limiting electron transfer between respiratory enzymes and the electrode surface by means of 'Q-wires'.

Promotie

In this dissertation, the synthesis and characterization of a series of iron complexes based on different ligand platforms are described.

Promotor: Prof.dr. E.F. van Dishoeck, Co-Promotor: M.R. Hogerheijde

Promotie

In de vroege Bronstijd gebruikten mensen bronzen voorwerpen als betaalmiddel. Tot die conclusie komen archeologen Maikel Kuijpers en Catalin Popa in een PLOS ONE artikel dat 20 januari verschijnt.

Assuming everywhere good reduction we generalize the class number formula of Taelman to Drinfeld modules over arbitrary coefficient rings.

Promotie

Promotie

Promotie

Promotie

This dissertation consists of two parts, with the common theme "Exploration on and of Networks".

Promotores: B. Erez, P. Stevenhagen, Co-Promotor: B. de Smit

Promotie