Employing an improved numerical method, we approach solutions for the Dirichlet boundary value forward problem of the Electrical Impedance Equation in the plane. Some of the considered conductivity functions posses an exact mathematical representation. The rest arise from geometrical figures. Both classes of conductivity functions are analyzed within bounded domains, emphasizing the results cor...

The lateral masking effect results in lower performance on letter recognition when items are flanked by other stimuli. Using a new paradigm based on discrimination (feature analysis) and categorization (memory access) tasks, we investigated the influence of level of processing (as addressed, respectively, by these two tasks) and stimulus type (Latin letters, Korean letters and geometrical figur...

This article presents a pilot study of the use of two new tangible interfaces and virtual worlds for teaching geometry in a secondary school. The first tangible device allows the user to control a virtual object in six degrees of freedom. The second tangible device is used to modify virtual objects, changing attributes such as position, size, rotation and color. A pilot study on using these dev...

The geometrical arrangement of single-molecule-high islands and the contact between them have large roles in determining the electrical properties of field effect transistors (FETs) based on monolayer-scale pentacene thin films. As the pentacene coverage increases through the submonolayer regime there is a percolation transition where islands come into contact and a simultaneous rapid onset of ...

Permission is granted to quote short excerpts and to reproduce figures and tables from this report, provided that the source of such material is fully acknowledged. Abstract. In this paper, we show that a 3D laser scanner tracking system can be efficiently used in a projective mode similar to photogrammetry-based methods. The best of both laser ranging and photogrammetry can be combined to incr...

Differences between the geometrical properties of simple configurations and their visual percept are called geometrical-optical illusions. They can be differentiated from illusions in the brightness or color domains, from ambiguous figures and impossible objects, from trompe l'oeil and perspective drawing with perfectly valid views, and from illusory contours. They were discovered independently...

We present the principle and the main steps of a new method for the visuo-spatial analysis of geometrical sketches recorded online. Visuo-spatial analysis is a necessary step for multi-level analysis. Multi-level analysis simultaneously allows classification, comparison or clustering of the constituent parts of a pattern according to their visuospatial properties, their procedural strategies, t...

Quadrilaterals are figures with which everybody becomes familiar in his/her very early stage of education. By studying these seemingly simple figures we can obtain some insights into the nature of the general problem of interpreting image contours. This paper discusses in detail how quadrilaterals are interpreted three-dimensionally, and draws feasible inferences about the general properties of...