The shape of a room ceiling influences acoustics of the room dramatically. Bad shape causes many acoustic defects like sound focusing, high delays, lack of reflections, whereas good shape provides useful support of the direct sound and as a result increases loudness, improves speech and music intelligibility. Many books give recommendations on the ceiling geometry, which has to be designed to r...

Realistic modeling of the interaction of light with objects is one important challenge in photorealistic or predictive rendering. Since the modeling of a desired appearance using parametric reflection models can be rather tideous task one way to obtain realistic reflection properties are measurements of real world surfaces. For arbitrary (non-fluorescent, nonphosphorescent) materials, the refle...

This paper argues for three fundamental properties that every modeling approach should posses. It presents a simple classification schema for models and proposes some comparison criteria. Finally it provides some reflection on properties currently in the CMA ”parking

The reflection of light at interfaces limits the performance of optical components. An anti-reflection (AR) coating layer is often applied to improve the optical transmittance. Besides the commonly used singleor multi-layer coatings reducing the reflection, subwavelength nanostructures have gained more attention as an effective AR feature. A wide choice of materials can be nanostructured withou...

Our objective is to extend the standard results of preservation and reflection of properties by bisimulations to the coalgebraic setting, as well as to study under what conditions these results hold for simulations. The notion of bisimulation is the classical one, while for simulations we use that proposed by Hughes and Jacobs. As for properties, we start by using a generalization of linear tem...

Our objective is to extend the standard results of preservation and reflection of properties by bisimulations to the coalgebraic setting, as well as to study under what conditions these results hold for simulations. The notion of bisimulation is the classical one, while for simulations we use that proposed by Hughes and Jacobs. As for properties, we start by using a generalization of linear tem...

This thesis is concerned with the reflection and transmission properties of layered lefthanded materials (LHM). In particular, the reflection properties of (LHM) slabs are studied for the Goos-Hiinchen (GH) lateral shift phenomenon. We demonstrate a unique GH lateral shift phenomenon, which shows that both positive and negative shifts can be achieved using the same LHM slab configuration. This ...

In the present study, the inherent characteristic of carbon nanotubes to absorb/attenuate the energy of electromagnetic waves has been exploited. The results indicate that the incorporation of CNTs in the polyurethane matrix has significant effect on the microwave interaction properties. Fabrics are developed through coating process using formulations based on different concentrations of multi ...

An algorithm to estimate reflection coefficient properties of materials based on code multipath errors is developed and tested in two urban environments. The algorithm extends an existing model that integrates 3D structure models, electromagnetic ray-tracing algorithms, antenna pattern measurements, and receiver tracking loop models to simulate code multipath errors. Instead of using the Fresne...

We present a three-dimensional analysis of guided resonances in photonic crystal slab structures that leads to a new understanding of the complex spectral properties of such systems. Specifically, we calculate the dispersion diagrams, the modal patterns, and transmission and reflection spectra of these resonances. From these calculations, a key observation emerges involving the presence of two ...