It is a common technique in global optimization with expensive black-box functions to learn a surrogate-model of the response function from past evaluations and use it to decide on the location of future evaluations.

In his book The magic of healing, Willem van der Does talks about 14 pioneers in the history of psychiatry. These pioneers all had one thing in common: they started with a radical idea which led to great enthusiasm.

The Jeugdwerkgroep is a national astronomy association for young people who are interested in astronomy. The Leiden section organizes a monthly meeting in the Old Observatory Leiden.

For hundreds of years, the island of Sri Lanka was a crucial stopover for people and goods in the Indian Ocean. For the Dutch East India Company, it was also a crossroads in the Indian Ocean slave trade. Slavery was present in multiple forms in Sri Lanka—then Ceylon—when the British conquered the island…

In 'Dutch Atlantic Connections, 1680-1800', Gert Oostindie and Jessica V. Roitman, both of the Royal Netherlands Institute of Southeast Asian and Caribbean Studies (KITLV) and also affiliated with the History Institute of Leiden University, assemble an internationally acclaimed selection of authors,…

An overview of Professional Associations and Journals

Promotor: Prof.dr. M.K. Richardson

This is the physics summer school of Leiden University. It is part of the Leiden Institute of Physics (LION). The summer school is intended for Bachelor (BSc) students in physics. It covers topics from quantum matter and optics, to biological & soft matter physics and cosmology and theoretical physics.…

Everything you need to know about the minor American Studies.

Wim Willems and Hanneke Verbeek were awarded with the Die Haghe Prize of 2016 for their book ‘Hier woonden wij. Hoe een stad zijn Joodse verleden herontdekt’ (English: ‘This is where we lived. How a city re-discovers its Jewish past.’) It is an exciting book about the rise and fall of the Jewish community…

In personal stories, university staff and students with different backgrounds reflect on our colonial and slavery past. How does this history affect the present and the future?

How were Spanish commanders fighting in the Low Countries between 1567 and 1577 portrayed in Spanish and Dutch narrative sources during the Eighty Years War?

Conference

From fake news via WhatsApp to mini hearts from a 3D printer: four Leiden researchers have been awarded a Consolidator Grant by the European Research Council. These grants, of up to 2m euros, enable researchers to establish or expand their research team and continue to develop their career.

An international team of astronomers from Leiden Observatory and others, has for the first time mapped a piece of the dark, cosmic web. The research strengthens the hypothesis that the young universe consisted of huge numbers of small groups of newly formed stars. The astronomers publish their findings…

How do stars and galaxies form? What is dark matter? To answer these and other questions, we need increasingly large telescopes. And to build these, we need international partnerships. A series on the impact of collaboration.

As Director-General of the ESO for the past ten years, Leiden University astronomer Tim de Zeeuw had ‘the best astronomy job in the world’. Back at the Leiden Observatory, he is focusing on the first 3D map of the Milky Way.

For the first time, astronomers have observed in three dimensions that gas from spiral galaxies is blown upwards and downwards at high speed, far out of the galaxy. They thereby confirm the theory of galaxy evolution: that star-forming galaxies create intergalactic gas flows by discharging gas along…

No less than four Leiden research teams have been awarded a grant by NWO. On 27 July NWO honoured 21 applications in the Open Competition ENW-XL. NWO awards the grants to consortia in the exact and natural sciences who are doing unconnected fundamental research that is 'driven by curiosity'.

Astronomers at Leiden University have discovered the first planets using a new instrument: the planet hunter MASCARA. This instrument, developed at Leiden Observatory, looks specifically for planet transitions around the brightest stars in the sky, which surprisingly enough have so far have hardly been…

This publication of the School of Advanced Study of the University of London is one of the outcomes of the Landscapes of Early Roman Colonization project and the Colonial Rural Networks project (NWO, Dr. T.D. Stek). The volume, edited by Tesse Stek and prof. Gert-Jan Burgers of the Free University Amsterdam,…

An Introduction and Field Guide, Second and Revised Edition (15 December 2014)

This dissertation aims to provide insight in ethnic prejudice in Chinese-Dutch children and the ethnic socialization context they are exposed to through three social-contextual factors, i.e., parents, children’s books, and the COVID pandemic.

On 23 February 2022, Cale Davis defended the thesis 'Prosecutorial Discretion in International Criminal Justice'. The doctoral research was supervised by Prof. C. Stahn en Dr. J.C. Powderly.

The Khoesan were the first people in Africa to undergo the full rigours of European colonisation. By the early nineteenth century, they had largely been brought under colonial rule, dispossessed of their land and stock, and forced to work as labourers for farmers of European descent.

Promotor: J.W. van Holten

We explore the particle physics and quantum world at the time of the big bang.

Never has good policy been so important. From unemployment and a lack of affordable housing to regulating cryptocurrencies and protecting against cybersecurity threats, the challenges we face are complex and global. The text explains how policymaking works: from the emergence of policy ideas to deciding…

During the bachelor’s programme Astronomy you will immerse yourself in questions about our universe. Questions such as: ‘what happens in a black hole?’ and ‘what is dark matter?’ In doing so you will learn to apply mathematics and physics to astronomical problems and you will work with computer simulations…

Categories of gender and sexuality are the subject of heated debates in our everyday lives. To understand how systems of gender and sexuality operate, and why these are such contested areas we need to study these categories came about historically.

This is an Erasmus+ International Credit Mobility project of the Faculty of Humanities with the Anton de Kom University in Paramaribo.

December 2020 saw the crowning publication of the Landscapes of Survival project by Professor Peter Akkermans. Its main topic is human habitation in marginal environments like the deserts of the Arabian Peninsula. ‘The people living here built their own society, and they would not have viewed it as…

Psychologen laten zich horen over de plannen om de internationale bacheloropleidingen op te heffen in de Randstad en Tilburg. Het inititatief #Ikbeneenpsycholoog van Judith Schomaker op LinkedIn vindt navolging. Lees een selectie van de posts en ook het blog van Eiko Fried over de consequenties.

ESA’s space telescope Gaia, which maps the Milky Way, completes its active phase of scanning the sky on 15 January. Over the past decade, Gaia has made more than three trillion observations of about two billion stars and other cosmic objects. ‘Gaia is already the discovery machine of the decade,’ Leiden…

Inaugural lecture

Alumni event

What, and especially who has formed the city The Hague? Wim Willems, professor Social History and director of the Modern Urban Studies (MUS) Institute, writes about it in his series of historical and autobiographic books about The Hague.

Jordy Bouwman and future Sterrewachter Reinout van Weeren have been awarded a Vidi subsidy to set up or expand their own line of research.

Even with state-of-the-art technology, it is almost impossible to see: a cosmic neutrino. Yet scientists have managed to image this particle with a deep-sea telescope. And that could help to better understand our universe. Leiden particle physicists collaborated on this ambitious project, published…

It is time for the international community to put a stop to war crimes – especially against medical personnel, argued international chair of Doctors Without Borders Joanne Liu in her Cleveringa lecture.

best phd theses of the faculty of science Leiden - physics, chemistry, computer science, biopharmaceutical sciences, biology, industrial ecology, environmental sciences, astronomy, mathematics

Managing Diversity: Supervising Functions in Managing Colonial Workplaces

Bordering Up: Regulating Mobility Through Passes, Walls and Guards

Is there extra-terrestrial life out there? It now looks as though we can sketch out an answer to this enduring question. Leiden Observatory is helping to build new instruments to find the most promising exoplanets.

Professor Wim Willems of the Centre for Modern Urban Studies (MUS), together with Anne van Mourik, is researching the life of Ru Paré, the woman who saved 52 Jewish children during World War II.

De modest fashion-industrie is een miljardenindustrie, ontstaan vanuit de behoefte van vrouwen om zich meer bescheiden (lees: bedekt) te gaan kleden. Het Stedelijk Museum Schiedam presenteert daarom in samenwerking met Arminius het Modest Fashion Symposium.

We have examined sequences from the ligand-binding domain of the nicotinic acetyl choline receptor (nAChR) in 148 vertebrate species. We are in interested in this receptor because the α-neurotoxins of many venomous snakes binds to this receptor in its location at the neuromuscular junction in all ve…