Computer models of spiral structure

Contact pressure models for spiral phyllotaxis and their computer simulation.

We present a simple, biologically motivated model for the creation of phyllotactical patterns in capitula and their computer simulation. An in-depth investigation of Ridley's contact pressure model is performed and a refinement of contact pressure between primordia on the basis of local centroidal Voronoi relaxation is presented. Using this method in combination with Hofmeisters rule for placin...

Theories of Spiral Structure

Much as the discovery of these strange forms may be calculated to excite our curiosity, and to awaken an intense desire to learn something of the laws which give order to these wonderful systems, as yet, 1 think, we have no fair ground even for plausible conjecture. Lord Rosse (1850) A beginning has been made by Jeans and other mathematicians on the dynamical problems involved in the structure ...

The Human-Computer Interaction Spiral

Multidisciplinary collaboration is essential for effective human computer interaction. Historically computer science, psychology and the social sciences have operated as discreet disciplines. However with the increased use of Information communication technologies in everyday life issues of appropriate design, functionality and accessibility assume increased importance. In this paper a model fo...

Galactic spiral structure

We describe the structure and composition of six major stellar streams in a population of 20 574 local stars in the New Hipparcos Reduction with known radial velocities. We find that, once fast moving stars are excluded, almost all stars belong to one of these streams. The results of our investigation have led us to re-examine the hydrogen maps of the Milky Way, from which we identify the possi...

Computer Science Research Community: The Death Spiral?