6 citations · 17 across the 15 of their papers we have counts for
16 papers
3D evolution of protein networks and lipid globules in heat-treated egg yolk
Felix Wittwer, Nimmi Das Anthuparambil, Frederik Unger +5
Upon heating, egg yolk transforms from a liquid to a gel due to protein denaturation. This process can serve as a useful model to better understand protein denaturation in general.…
X-ray Strain and Stress Tensor Tomography
Peter Modregger, James. A. D. Ball, Felix Wittwer +2
The microscopic distribution of strain and stress plays a crucial role for the performance, safety, and lifetime of components in aeronautics, automotive and critical infrastructur…
Ultimate Sensitivity in X-ray Diffraction: Angular Moments vs. Shot Noise
Peter Modregger, Felix Wittwer, Ahmar Khaliq +6
The sensitivity of x-ray diffraction experiments towards Bragg peak parameters constitutes a crucial performance attribute of experimental setups. Frequently, diffraction peaks are…
Measurements of dislocations in 4H-SiC with rocking curve imaging
Ahmar Khaliq, Felix Wittwer, Niklas Pyrlik +9
4H Silicon Carbide (4H-SiC) combines many attractive properties such as a high carrier mobility, a wide bandgap, and a high thermal conductivity, making it an ideal candidate for h…
Annular x-ray optics offer superior resolution for radiation sensitive samples
Felix Wittwer, Peter Modregger
High-resolution x-ray microscopy requires a high photon flux to measure the signal from weakly scattering samples. This exposes samples to high radiation doses, potentially damagin…
Parallax in angular sensitive powder diffraction tomography
Peter Modregger, Ahmar Khaliq, Felix Wittwer
While a few methods for the determination of depth-resolved strain distributions each with inherent limitations are available, tomographic reconstruction has been applied to this p…
Texture tomography with high angular resolution utilizing sparsity
Mads Carlsen, Florencia Malamud, Peter Modregger +5
We demonstrate a novel approach to the reconstruction of scanning probe x-ray diffraction tomography data with anisotropic poly crystalline samples. The method involves reconstruct…
Multi-contrast x-ray identification of inhomogeneous materials and their discrimination through deep learning approaches
Thomas Partridge, Sukrit S. Shankar, Ian Buchanan +4
Recent innovations in x-ray technology (namely phase-based and energy-resolved imaging) offer unprecedented opportunities for material discrimination, however they are often used i…
Increased material differentiation through multi-contrast x-ray imaging: a preliminary evaluation of potential applications to the detection of threat materials
A. Astolfo, I. G. Haig, D. Bate +2
Most material discrimination in security inspections is based on dual-energy x-ray imaging, which enables the determination of a material's effective atomic number (Zeff) as well a…
Object Initialization For Ptychographic Scans With Reduced Overlap
Felix Wittwer, Peter Modregger
X-ray ptychography utilizes overlapping illuminations to reconstruct the object's phase and absorption signal with spatial resolutions much smaller than the focus size. Usually, th…
Defect detection in glass fabric reinforced thermoplastics by laboratory-based X-ray scattering
Özgül Öztürk, Rolf Brönnimann, Peter Modregger
Glass fabric reinforced thermoplastic (GFRT) constitutes a class of composite materials that are especially suited for automobile construction due to their combination of low weigh…
Ptychographic reconstruction with wavefront initialization
Felix Wittwer, Peter Modregger
X-ray ptychography is a cutting edge imaging technique providing ultra-high spatial resolutions. In ptychography, phase retrieval, i.e., the recovery of a complex valued signal fro…
Calibration of scanning acoustic microscopy for the differentiation between unstable and stable atherosclerotic plaques by X-ray fluorescence imaging
Peter Modregger, Mallika Khosla, Prerana Chakrabarti +4
Although cardiovascular diseases are the leading cause of death globally, non-invasive and inexpensive diagnostic tools for the identification of associated unstable atheroscleroti…
Accelerated iterative tomographic reconstruction with x-ray edge illumination
Peter Modregger, Tomasz Korzec, Jeff Meganck +3
Compared to standard tomographic reconstruction, iterative approaches offer the possibility to account for extraneous experimental influences, which allows for a suppression of rel…
X-ray diffraction with micrometer spatial resolution for highly absorbing samples
P. Chakrabarti, A. Wildeis, M. Hartmann +10
X-ray diffraction with high spatial resolution is commonly used to characterize (poly-)crystalline samples with, for example, respect to local strain, residual stress, grain bounda…
Simultaneous submicrometric 3D imaging of the micro-vascular network and the neuronal system in a mouse spinal cord
Michela Fratini, Inna Bukreeva, Gaetano Campi +11
Defaults in vascular (VN) and neuronal networks of spinal cord are responsible for serious neurodegenerative pathologies. Because of inadequate investigation tools, the lacking kno…