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.

Artificial intelligence algorithms govern in subtle, yet fundamental ways, the way we live and are transforming our societies. The promise of efficient, low‐cost or ‘neutral’ solutions harnessing the potential of big data has led public bodies to adopt algorithmic systems in the provision of public…

Freshwater and brackish water ecosystems are arguably the most vulnerable ecosystems on earth, due to concentrated human developments in and around them. The Pontocaspian (PC) region located at the border of Europe and Asia contains a variety of brackish water ecosystems and unique inhabitants, known…

A team of scientists, including Leiden Astronomer Alice Booth, has discovered silicon monosulfide molecules in the dust disk around a young star. Such molecules indicate planet formation. The team made the discovery using the ALMA telescopes. This method provides an alternative when direct observation…

One of the ambitions of the Learning@LeidenUniversity vision on teaching and learning is to foster an international and inclusive educational community in which everyone feels welcome, regardless of religion, sex, sexual orientation or cultural background. One student service that promotes inclusion…

A team of Leiden astronomers used the latest set of data from ESA’s Gaia mission to look for high-velocity stars being kicked out of the Milky Way, but were surprised to find stars instead sprinting inwards – perhaps from another galaxy.

In the documentary ‘Pretend Student’, former students talk about why they let everyone believe they were still studying. How can you make sure you don’t end up in such an impossible situation? Four questions for Leiden Student Dean, Romke Biagioni, who worked on the documentary.

Pastoralist Societies, Rock Art and Literacy in Jordan’s Black Desert (200 BC to 800 AD)

The mission of Thamyris/Intersecting is to rigorously bring into encounter the crucial insights of black and ethnic studies, gender studies, and queer studies, and facilitate dialogue and confrontations between them.

The Sustainable Development Goals (SDGs) should have ended poverty, inequality and climate change by 2030. In a special campaign, the Dutch universities are showing how they are helping to achieve these goals.

Heavy rainfall can cause streets to flood and basements and tunnels to overflow. Jan van Rijn investigated, together with Christiaan Lamers (formerly of Leiden University) and Ton Beenen (STOWA, RIONED), how data science can help to predict which areas are at greater risk of flooding. Van Rijn presented…

If a pill containing no active ingredients still helps, this positive expectation is called a placebo effect. A negative expectation is called a nocebo effect. Both can be produced by verbal suggestions and conditioning. According to Andrea Evers’ research group, combining these is the most promising…

Three projects with Leiden researchers are to receive a subsidy from NWO for the construction or renovation of large-scale research facilities. They will be working on electron microscopy, an X-omics initiative and an X-ray telescope. The projects are part of the National Roadmap for Large-Scale Scientific…

Modern optimization algorithms offer solutions for architectural decisions like spatial, structural and energy efficiency. A young computer scientist from Leiden University co-authored a paper that won the Best Paper Award at a leading conference in Krakow during the summer.

Immerse yourself: read books, listen to podcasts and watch films about racism, discrimination and the colonial past.

Lecture

Cramming from a book, making notes or learning summaries. In the past these were about the only ways to memorise your course material. But that has long since changed. Multimedia is the code word. But is it effective?

Recent fieldwork at the vast desert region in north-eastern Jordan has revealed an immensely rich heritage of an area that is difficult to access and archaeologically less known. Professor Peter Akkermans was interviewed about his groundbreaking research in this area, known as the Black Desert.

The most commonly used method for the taxonomic identification of tree trunks is wood anatomy. The number of experts in this area is decreasing, and education to become an wood anatomists takes many years. With the help of technology computer scientists of the Leiden Institute of Advanced Computer Science…

Researchers at the Leiden Institute of Advanced Computer Science (LIACS) are collaborating on the development of a conversation tool for patients with breast, prostate and skin cancer. The aim is to create a conversation tool that can support cancer patients in their care and help them make decisions.…

The key subject of the research programme Cities, Migration and Global Interdependence 1500 - Now (CMGI) is Inequality (at local, national and global levels).

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

Study information

Over a seven year period an international team of scientists has mapped more than a quarter of the northern sky using the Low Frequency Array (LOFAR), a pan-European radio telescope. From Leiden, Astronomer Timothy Shimwell and Huub Röttgering, among others, are involved. It reveals an astonishingly…

Lecture, Kaiser Spring Lecture

People are keen to make a contribution that will be valuable for scientific research. Many thousands are taking part in the Major Flu Survey. Leiden researcher Anne Land is publishing on this subject in the Journal of Science Communication.

Jamie Korporaal, who started as a junior lecturer at Leiden Law School during her master's studies and has now joined the faculty as a lecturer, will start the Labour Law specialisation after the summer. She discusses her career and this postgraduate training course with Marije Schneider, lecturer in…

By a stroke of luck, a team led by Dutch PhD student Martijn Oei has discovered a radio galaxy of at least 16 million lightyears long. The pair of plasma plumes is the largest structure made by a galaxy known thus far. The finding disproves some long-kept hypotheses about the growth of radio galaxie…

The physics of black holes appears to be as far removed from the physics of electrons in metals as it can be.

Does the δ-machine have higher accuracy than the other feature-based classifiers in some conditions?

In this thesis, we have used numerical approaches to study the effects of translational symmetry breaking on strange metallic systems as realised by the holographic duality⁠.

Studies in current archaeological applications of remote sensing and non-invasive prospection methods edited by Hans Kamermans, Martin Gojda and Axel G.

An overview of Academic E-Resources and Bibliographies

The Leiden Slavery Studies Association (LSSA) is dedicated to promoting a greater understanding of slavery and post-slavery in any period and any geographical region.

There is no heritage without emotional sharing and clashing. This article explores the involvement of divergent emotions in heritage making by discussing the debate series of Imagine IC and the Reinwardt Academy and zooming in on the commemoration of slavery and imagery of ‘Black Pete’ in the Netherlands.…

Like spoken languages, sign languages evolve organically and do not always have the same origin. This produces different ways of communication and annotation. Manolis Fragkiadakis wrote his PhD thesis on this.

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…

The design for the METIS instrument for the Extremely Large Telescope (ELT) is final. The European Southern Observatory (ESO) has given the green light for production of all parts of the instrument. It is the first ELT instrument, designed and to be built under Dutch leadership, to formally pass the…

Adrian Hamers is researching the way in which celestial bodies orbit each other, now and in the future. This often turns out to be more erratic than you might think. He will defend his PhD dissertation on 21 June.

Anke Klein and her team have devised a fun and useful app to help anxious children. In the app, children can upload a video of themselves showing, for example, something that went well for them and share their success with parents, granny or grandad. Developmental psychologist Klein talks about the…

Coronavirus is generating a great deal of uncertainty throughout the world. Fortunately, there are some bright spots, such as the residents of Italian cities who are in quarantine trying to keep everyone's spirits up with their clapping and singing. Closer to home, Leiden historian Suze Zijlstra took…

Lecture, Research Seminar Europe 1000-1800

Its idyllic setting and white sandy beaches have made the Maldives a hotspot for tourists. This provides an income but is a problem for the fragile natural environment. Students from various universities worked with the local people to make the soil more fertile. How did they go about it?

This week Leiden student Roos Kolkman will be campaigning throughout the country to win the votes of Dutch youth in order to become the next UN Youth Delegate for Sustainable Development.

Drones are proving to be a good means of mapping man-made changes in the landscape. Geophysicist Till Sonneman and his colleagues (archaeology) are experimenting with drones in inaccessible areas of the Caribbean.

Professor of Media Law and Information Society Tarlach McGonagle is concerned about the increase in online disinformation and hate speech. He argues that human rights should guide new policies for the online world. McGonagle will give his inaugural lecture on 9 May.

Professor of Fungal Genetics and Biotechnology Arthur Ram explains how fungi can help us be more sustainable.

Artificial intelligence can help doctors analyse images such as MRI scans. In future it may even be able to predict how a tumour will grow. And that is badly needed to relieve the pressure on healthcare workers.