We review some recent results in digital geometry obtained by using a combinatorics on words approach to discrete geometry. Motivated on the one hand by the well-known theory of Sturmian words which model conveniently discrete lines in the plane, and on the other hand by the development of digital geometry, this study reveals strong links between the two fields. Discrete figures are identified ...

A square filled with horizontal stripes is perceived as thinner than one with vertical stripes (Helmholtz illusion). This is not consistent with a common belief that horizontally striped clothing makes a person look fatter, and studies on this problem have shown inconsistent results. Here, we demonstrate three factors that could have complicated the issue. First, the Helmholtz effect is stronge...

The aim of the present study is to provide evidence for the role of action used mainly by children with cerebral palsy to get over difficulties in some mental rotation tasks. 25 children with cerebral palsy and 25 able children were given a task inspired from the Tétris video game consisting in fitting together geometrical figures. Results show that children with cerebral palsy are able to anti...

Since its introduction in 1994 direct conversion sixport receivers have attracted a considerable attention at microwave frequencies, with most recent work focusing on the so called sixport receivers with analog I/Q generation. Besides its applications at microwave frequencies, six-port receivers with I/Q regeneration play a crucial role in the optical communications field, as they are the most ...

We consider the interaction of a nonlinear Schrödinger soliton with a spatially localized (point) defect in the medium through which it travels. Using numerical simulations, we find parameter regimes under which the soliton may be reflected, transmitted, or captured by the defect. We propose a mechanism of resonant energy transfer to a nonlinear standing wave mode supported by the defect. Exten...

Techniques for measuring upper femoral torsion in children have been progressively developed by Dunn (1952), Ryder and Crane (1953), Dunlap, Shands, Hollister, Gaul and Streit (1953), Magilligan (1956) and Shands and Steele (1958). The projected neck-shaft angle of inclination and the projected angle of femoral torsion (Fig. 1) may be used to plot the true torsion on a table based on a mathemat...

Objects in our visual environment are perceived as integral wholes even when their retinal images are incomplete. We ask whether the perceptual precision of subjective interpolation between isolated image parts depends on the overall proportion of visible image information or rather on its geometrical arrangement. We used Varin-type subjective shapes that provide less physical stimulus informat...

Two production experiments were conducted to investigate how colour overspecification varies with the object category the referent falls into. We found a positive correlation between how important colour is for objects and how likely speakers are to produce colour overspecification when referring to those objects. We also found that speakers tend to produce colour overspecification when referri...

To investigate the number of correct responses, the reaction time and the event-related brain potentials, effects of positive and negative verbal reinforcement on the visuo-spatial recognition of simple geometric figures, in condition of backward masking, were studied in healthy subjects and patients with chronic alcoholism. It was found that in performing the mental construction of geometrical...

A known iterative computational procedure is used for internal normal ball loads calculation in statically loaded single-row, angular-contact ball bearings, subjected to a known thrust load, which is applied in the inner ring at the geometric bearing center line. Numerical aspects of the iterative procedure are discussed. Numerical examples results for a 218 angular-contact ball bearing have be...