54 zoekresultaten voor “x-ray” in de Publieke website
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X-ray spectroscopy of merging galaxy clusters
This thesis focuses on the X-ray spectral analysis of merging galaxy clusters and the plasma code development for future high-resolution X-ray spectroscopy observations.
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Hunting dark matter with X-rays
Promotor: A. Achúcarro Co-promotor: A. Boyarsky
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Tailoring x-ray tomography techniques for cultural heritage research
Visualizing the internal structure is a crucial step in acquiring knowledge about the origin, state, and composition of cultural heritage artifacts. Among the most powerful techniques for exposing the interior of cultural heritage objects is computed tomography (CT), a technique that computationally…
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Winds in the AGN environment: new perspectives from high-resolution X-ray spectroscopy
Promotor: J.S. Kaastra Co-promotor: E. Constantini
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X-ray spectroscopy of interstellar dust: from the laboratory to the Galaxy
In this thesis, we present new laboratory data of interstellar dust analogues.
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modeling of the hot Universe: Advances and challenges in high-resolution X-ray spectroscopy
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.
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Silicon pore optics for high-energy optical systems
This thesis examines silicon pore optics (SPO), a technology that exploits silicon wafers from the semiconductor industry to create extremely high quality X-ray optics, by studying its manufacturing process, applications, and prospects.
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X-raying extragalactic gas: warm-hot gas in the EAGLE simulations
I have studied the hot, diffuse gas around and between galaxies. Specifically, I have used the EAGLE numerical simulations of galaxy formation to predict the properties of this gas, and I have used those properties to predict specific observables: soft X-ray absorption and emission lines.
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From intracluster medium dynamics to particle acceleration
The intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters.
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The structure of the cytochrome P450cam-putidaredoxin complex determined by paramagnetic NMR spectroscopy and crystallography
Promotor: Prof.dr. M. Ubbink
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The spin evolution of accreting and radio pulsars in binary systems
Pulsars were first discovered in 1967 and since then the population has grown and expanded over several wavelengths.
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CO oxidation catalysis at multiple length scales
Promotor: J.W.M. Frenken Co-Promotor: R. Felici
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From supernovae to galaxy clusters: observing the chemical enrichment in the hot intra-cluster medium
Promotor: Jelle S. Kaastra Co-promotor: Jelle de Plaa
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The structure of a working catalyst: from flat surfaces to nanoparticles
Promotor: Prof.dr. J.W.M. Frenken
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Spectral imaging and tomographic reconstruction methods for industrial applications
Radiography is an important technique to inspect objects, with applications in airports and hospitals. X-ray imaging is also essential in industry, for instance in food safety checks for the presence of foreign objects.
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A Model Membrane Approach to Elucidate the Molecular Organization in the Skin Barrier
Promotor: J. A. Bouwstra
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Filter-based reconstruction methods for tomography
Promotor: K.J. Batenburg
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Deep learning for tomographic reconstruction with limited data
Tomography is a powerful technique to non-destructively determine the interior structure of an object.Usually, a series of projection images (e.g.\ X-ray images) is acquired from a range of different positions.
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Tuning in to the feedback bassline: revealing the operation of AGNs in galaxy clusters with high-resolution radio observations
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.
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Substrate adaptability of β-lactamase
The research aims to explore the evolutionary adaptability of enzymes and the impact of temperature on protein evolution pathways, using M. tuberculosis β-lactamase BlaC as the object of study. Enzymes inherently embody a delicate balance between activity and stability, and the acquisition of new enzymatic…
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Tailoring X-ray tomography techniques for cultural heritage research
Promotie
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Revealing the nature of new low-frequency radio source populations
It has now been well established that shocks and turbulent motions in the intra-cluster medium (ICM) generated through cluster mergers can produce large-scale synchrotron emission.
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Systematic investigations into the role of ceramide subclass composition on lipid organization and skin barrier
The lipids in the uppermost layer of the skin, the stratum corneum (SC), play an important role in the skin barrier function. The three main SC lipid classes are ceramides (CER), cholesterol and free fatty acids.
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Modeling interstellar bubbles: near and far
Promotor: Prof. dr. A.G.G.M. Tielens
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Merging galaxy clusters: probing magnetism and particle acceleration over cosmic time
In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.
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A well-established harmony in chaos: from isolated galaxies to galaxy clusters
The origin and evolution of galaxies are closely linked to many different physical phenomena.
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Cathodic corrosion
Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.
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The structure of the dusty cores of active galactic nuclei
Promotor: W. Jaffe, Co-promotor: K. Meisenheimer
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Algebraic filters for filtered backprojection
Promotor: K.J. Batenburg, Co-promotor: A.W. van der Vaart, B. de Smit
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Reconstruction Methods for Combined HAADF-STEM and EDS Tomography
The research in this thesis is focused on tomographic reconstruction based on two imaging modalities in electron microscopy.
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Network flow algorithms for discrete tomography
Promotor: R. Tijdeman, Co-promotor: H.J.J. te Riele
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Exploring the interactions of M dwarf winds and cosmic rays
This thesis focus on the interaction between M dwarf stellar winds and Galactic cosmic rays and the possible effects on the habitability of exoplanets.
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Cosmic particle acceleration by shocks and turbulence in merging galaxy clusters
In this thesis, I study the formation of large-scale structure and the physics of particle acceleration at large scales (~Mpc).
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Atomic Insights into Hydrodesulfurization
Hydrodesulfurization (HDS) is an ubiquitous part of oil refining that ensures that fuels are cleaned of impurities and environment release of pollutants such as SOx and NOx gasses are minimized.
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Clues from stellar catastrophes
Promotores: S.F. Portegies Zwart, E. M. Rossi
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On the optimization of imaging pipelines
In this thesis, topics relating to the optimization of high-throughput pipelines used for imaging are discussed. In particular, different levels of implementation, i.e., conceptual, software, and hardware, are discussed and the thesis outlines how advances on each level need to be made to make gains…
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Microscopy and Spectroscopy on Model Catalysts in Gas Environments
In surface science there is great effort to move from studying simple, flat model surfaces in vacuum to investigating more complex model catalysts in gas environments (in situ). This thesis gives three examples of such studies using microscopy and spectroscopy.
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Software developments in automated structure solution and crystallographic studies of the Sso10a2 and human C1 inhibitor protein
Promotor: Prof.dr. J.P. Abrahams, Co-Promotor: N.S. Pannu
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Half miljoen voor röntgenonderzoek om meesterwerken te behouden
Hoogleraar informatica Joost Batenburg krijgt een half miljoen euro van NWO om de conservering van historische schilderijen met behulp van 3D-röntgenbeeldvorming te verbeteren.
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Latest hardware for computer research on medical imaging
The LIACS Media Lab has received a research grant from the worldwide leading graphics hardware company NVIDIA. The grant exists of newly developed hardware utilizing thousands of processors. LIACS researchers will use it to investigate deep learning in understanding imagery from sources such as MRI…
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Lichtpuntje in de zoektocht naar donkere materie
De Leidse astrofysicus Alexey Boyarsky en zijn medewerkers hebben mogelijk een spoor van donkere materie geïdentificeerd dat leidt naar een nieuw deeltje: het steriele neutrino. Een onderzoeksgroep in Harvard deed dezelfde ontdekking op nagenoeg hetzelfde moment.
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Prof. dr. Joost Batenburg awarded with Vici grant 2015
The NWO (The Netherlands Organization for Scientific Research) awarded prof. Joost van Batenburg with the Vici grant 2015 for his research project ‘Real-time 3D Tomography’.
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Vier NWO-TOP subsidies voor Leidse astronomen en één voor wiskunde
NWO heeft vier TOP subsidies toegekend voor Leidse astronomen en één voor een Leidse wiskundige, landelijk zijn er 19 subsidies toekend aan exacte wetenschappers. De onderzoeken van prof. Xander Tielens met prof. Huub Rottgering, dr. Michiel Hogerheijde en dr. Jelle Kaastra zijn gehonoreerd met een…
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Misvorming van hart, ogen en zenuwstelsel: nano-plastics verstoren groei
Nano-plastics verstoren de ontwikkeling. Meiru Wang, onderzoeker bij het Instituut Biologie Leiden, keek naar de extreme effecten die piepschuim nano-deeltjes kunnen hebben, met kippenembryo’s als model. Haar resultaten zijn alarmerend. Zeker omdat nano-plastics overal zijn. In de lucht, drijvend door…
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Prof.dr.ir. Lucas van Vliet benoemd tot hoogleraar Meerdimensionale beeldanalyse
Prof.dr.ir. Lucas van Vliet is per 1 september 2012 aangesteld als hoogleraar Meerdimensionale beeldanalyse bij de faculteit Wiskunde en Natuurwetenschappen. Van Vliet blijft als hoofdfunctie zijn gelijknamige leerstoel bij de TU Delft bezetten.
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Space Scoop gelanceerd: sterrenkunde nieuwswebsite voor kinderen in 22 talen
Space Scoop, een gloednieuwe sterrenkunde nieuwswebsite voor kinderen is op donderdag 17 december 2015 gelanceerd in 22 talen. Space Scoop levert wekelijks spannend nieuws in begrijpelijke taal over de meest recente sterrenkundige ontdekkingen, samen met een prachtige ruimtefoto.
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Donkere materie of gewoon zwavel?
Een internationaal team van sterrenkundigen, onder wie Jelle Kaastra, heeft een nieuwe verklaring gevonden voor röntgenstraling in clusters van sterrenstelsels. Deze röntgenstralen kunnen ontstaan als koud waterstofgas botst op hete zwavel-ionen en zo elektrische lading overdraagt. Eerder werden de…
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Röntgenfoto van een schommelende katalysator
Drs. Richard van Rijn verhelderde met nieuwe technieken een veelgebruikte chemische reactie: het verbranden van koolmonoxide in een autokatalysator. Promotie op 8 mei.
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Staren naar het sterrenstof
Stofdeeltjes in de ruimte vormen de basis voor nieuwe sterren en planeten. Maar waar bestaan die stofdeeltjes uit, en hoe gedragen ze zich? Sascha Zeegers onderzocht het. Promotie op 1 november.
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Dubbele zwarte gaten verklaard met supercomputer
Zijn om elkaar heen draaiende zwarte gaten langzaam naar elkaar toegedreven? Of zijn ze bij elkaar in de buurt ontstaan? Leids astronoom Simon Portegies Zwart berekende samen met twee Amsterdamse collega's dat het tweede scenario behoorlijk waarschijnlijk is.