The main research question of this thesis was: Can nitrogen cycling on dairy farms on peat soil in the Dutch Green Heart area be improved by adapting management to the nitrogen supply from soil and by using other grassland species and crops without affecting milk production?

De Vrouw Vennepolder bij Oud Ade is omgetoverd tot het Polderlab. Wetenschappers en studenten van de Universiteit Leiden onderzoeken hier samen met boeren en burgers hoe je veenweidegrond duurzaam en rendabel beheert. Een geweldige kans voor studenten om te ervaren hoe ze wetenschappelijke kennis kunnen…

The use of N fertilizers has increased worldwide in the past century. While this increased input of N has increased food productivity, it has also contributed to decreases in biodiversity, soil quality and environmental health, including increases in greenhouse gas emissions.

The elementary excitations of magnets are called spin waves, and their corresponding quasi-particles are known as magnons. The rapidly growing field of Magnonics aims at using them as information carriers in a new generation of electronic devices, (almost) free of electric currents.

Freshwater biodiversity has been threatened by eutrophication due to excessive nutrients in the environment. Releasing the freshwater species from such pressures requires efforts from industry and manufacturers to avoid emissions to vulnerable and high-risk regions.

Advanced sensing techniques require graphene with high quality and well-controlled surface chemistry.

Membrane fusion is a vital process in living organisms and is mediated by zipper-like proteins.

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

This thesis systematically studies the physicochemical properties of non-planar, propeller-shaped, polycyclic aromatic hydrocarbons. The synthesis of several so-called propellerenes is described on a gram scale, using optimized procedures aimed at using less hazardous reagents and reducing the amount…

Vinasse is a major by-product generated by the sugarcane biofuel industry. It is a source of microbes, nutrients and organic matter and often it is recycled as fertilizer.

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

Promotor: Prof.dr. H.V.J. Linnartz, Co-Promotores: S. Ioppolo, H.M. Cuppen

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

Promotor: Prof.dr. M. Schilthuizen

Materials balances have been used in the recent past for the analysis of substance oriented environmental problems and the formulation of measures for environmental policy. In this study an integrated tool, based on the materials balance principle, has been developed for the analysis of both environmental…

This thesis explores interfacial conductance and electric field-effects in LaAlO3/SrTiO3 heterostructures.

De voedselproductie in Nederland is een economisch succes, maar heeft geleid tot veel milieuproblemen, waaronder stikstofvervuiling. Onlangs keurde de hoogste rechter het beleid af dat economische groei en vermindering van de stikstofverliezen combineerde. Hierdoor belandde het land in een stikstofcrisis.In…

Hoe zorgen we beter voor boer en aarde? In S&D, het tijdschrift van de Wiardi Beckman Stichting, proberen hoogleraar Jan Willem Erisman (Centrum Milieuwetenschappen Leiden) en landbouweconoom Krijn Poppe (Raad voor de leefomgeving en infrastructuur) deze vraag te beantwoorden.

Consequences for sediment stability and seston trapping

From surface science towards industrial practice using high-pressure scanning tunneling microscopy.

This thesis systematically analyzes the physical-chemistry of lipid-graphene interactions with the major objective of reconciliating the variety of results reported in the literature.

Aspergillus niger is an important industrial producer of organic acids and enzymes producing large amounts of spent fungal biomass.

There are many interpretations of quantum mechanics, and ultimately experiments are needed to verify or falsify these interpretations.

A dense region of a gaseous and dusty cloud collapses to form a protostar surrounded by a disk and an envelope. This thesis uses both observations and models to study physical and chemical conditions of these protostellar systems which are likely where planets start to form.

The marine shipping industry is one of the strongest emitters of nitrogen oxides (NOx), a pollutant detrimental to ecology and human health. Over the last 20 years, the pollution produced by power plants, the industry sector, and cars has been decreasing.

One of the key discoveries in exoplanet research over the past decade is the abundance of small planets in our Milky Way. Despite their high numbers, our understanding of their atmospheres remains limited, and it is unknown if they possess atmospheres at all.

Before the large scale use of renewable energy sources can be implemented in our society, the storage of electrical energy needs to be tackled. Storage the energy as hydrogen via the reduction of protons is a good option.

This thesis presents the results of a study on the interfaces of insulating oxides with and without the insertion of a magnetic layer.

Hot astrophysical plasma is ubiquitous in the Universe, from comets in our Solar system to the largest scale structures -- the cosmic web filaments. These hot plasmas, with the temperature of a few millions of degrees, are often observed in the X-ray wavelength range.

Catalysis is of extreme relevance in the production of everyday materials and plays a central role in many aspects of our life.

Promotors: Prof.dr. G.R. de Snoo, Prof.dr. G.A. Persoon, Prof.dr.ir. H.H. de Iongh

This thesis describes the synthesis and biochemical evaluation of a variety of cyclophellitol based activity-based probes and inhibitors targeting various endo- and exo-acting retaining glycosidases. In the last two decades a variety of probes and inhibitors for (hemi)cellulose degrading enzymes have…

Naar aanleiding van de explosie in Beirut maakte BBC podcastserie 'The Foodchain' een aflevering over de chemische stof die de explosie veroorzaakte: ammoniumnitraat. Deze stof wordt veelvuldig gebruik in kunstmest. Met Hoogleraar Environmental sustainability Jan Willem Erisman spraken ze over de effecten…

Description of Effects of glufosinate-ammonium on off crop vegetation.

Universiteit Leiden is deel van een Nederlands consortium dat 4,7 miljoen euro van NWO ontvangt voor de bouw van een faciliteit die gecontroleerd dunne laagjes materiaal kan maken. De faciliteit kan kleine én grote lagen produceren en is daarmee uniek in de wereld. Zulke grote lagen zijn belangrijk…

Volume 72 of the Netherlands Yearbook for History of Art is dedicated to the relationship of art and death in the Low Countries and its diaspora, from premodern times to the present. The editors welcome contributions on works of art and architecture (paintings, prints, sculptures, objects of applied…

Chemicus Alexander Kros en astronoom Joop Schaye maken deel uit van de vier Leidse wetenschappers die dit jaar uit de Vernieuwingsimpuls van NWO een Vici toegekend hebben gekregen. Met deze subsidie van anderhalf miljoen kunnen ze een eigen onderzoeksgroep opzetten en promovendi aanstellen.

Tot nu toe verliepen processen van het maken van ‘dunne films’ – met toepassingen in bijvoorbeeld smartphones en zonnebrillen - volgens de ‘trial and error’-methode. Vincent Fokkema van het Leids Instituut voor Onderzoek in de Natuurkunde heeft nu een uniek instrument ontwikkeld waarmee de processen…

Het is een team van onderzoekers gelukt om een enkel spinnend elektron te positioneren op een chip met een precisie van enkele nanometers. Hiermee ligt de weg open naar quantumchips met nano-elementen naar keuze. De resultaten zijn gepubliceerd in het gerenommeerde Applied Physics Letters.

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Congres/symposium

De

Submissions are sought for a special issue with Frontiers in Political Science that explores the conceptual and practical aspects of a ‘just’ energy transition both within and beyond Europe. In particular, contributions to the theoretical and interdisciplinary foundations of just transitions, as well…

Het Europese project SUNRISE - ‘zonne-energie voor een circulair economie’, is geselecteerd als één van de zes Coördinatie- en Ondersteuningsacties (CSA) binnen het Horizon 2020-programma van de Europese Commissie. Het project ontvangt een subsidie van 1 miljoen euro en zal de basis leggen voor een…

Promotie