Multiple reflections are usually considered to be noise and many methods have been developed to attenuate them. However, similarly to primary reflections, multiple reflections are created by subsurface reflectors and contain their reflectivity information. We can image surface related multiples, regarding the corresponding primaries as the sources. Traditional source-receiver migration assumes ...

We employ angle-resolved photoemission to study the electronic structure of atomically uniform films of Ag grown on Ge(111). A new kind of quantum well state is observed near a specific emission direction away from the surface normal. In contrast with the usual quantum well state arising from electron confinement by specular reflections at the surface and interface of the film, the new kind inv...

This survey reviews algorithms that can render specular, i.e. mirror reflections, refractions, and caustics on the GPU. We establish a taxonomy of methods based on the three main different ways of representing the scene and computing ray intersections with the aid of the GPU, including ray tracing in the original geometry, ray tracing in the sampled geometry, and geometry transformation. Having...

Localisation in rooms is characterised by the presence of multiple reflections interfering with the direct sound from source to listener. Nevertheless, due to the “precedence effect”, normal hearing listeners are able to cope in such situations by apparently ignoring the later arriving reflections. In studies on the precedence effect this situation is abstracted by playing a sound (the “lead”) ...

This paper presents an evaluation of high-dynamic-range (HDR) video tone mapping on a small screen device (SSD) under reflections. Reflections are common on mobile devices as these devices are predominantly used on the go. With this evaluation, we study the impact of reflections on the screen and how different HDR video tone mapping operators (TMOs) perform under reflective conditions as well a...

The high homology of its axonemal components with humans and a large repertoire of axonemal mutants make Chlamydomonas a useful model system for experiments on the structure and function of eukaryotic cilia and flagella. Using this organism, we explored the spatial arrangement of axonemal components under physiological conditions by small-angle x-ray fiber diffraction. Axonemes were oriented in...

Portfolios are increasingly being used to stimulate teachers' reflections. Frameworks for reflection on teaching often emphasize competencies and behaviours. However, other aspects of teacher functioning are also important, such as the teaching environment and individual teachers' beliefs, professional identity and mission. In a study among five medical school teachers, we explored how a portfo...

Recently, techniques for realistic image synthesis using computer graphics have been widely used in many applications. The reality of the computer-generated images can be greatly improved by taking into account the reflections observed in mirrors, cars, glass walls of a building, etc. Therefore, there has been extensive research into rendering these reflections. However, the computational cost ...

We consider energy-conserving semi-discretizations of linear wave equations on nonuniform grids. Specifically we study explicit and implicit skew-adjoint finite difference methods, based on the assumption of an underlying smooth mapping from a uniform grid, applied to the first and second order wave equations. Our interest is in internal reflection of energy at abrupt variations in grid spacing...

Recently I posted a paper entitled "External observer reflections on QBism". As any external observer, I was not able to reflect all features of QBism properly. The comments I received from one of QBism's creators, C. A. Fuchs, were very valuable to me in better understanding the views of QBists. Some of QBism's features are very delicate and extracting them from articles of QBists is not a sim...