The spatial volume occupied by an atom depends on its electronic density. Although this density c... more The spatial volume occupied by an atom depends on its electronic density. Although this density can only be evaluated exactly for hydrogen-like atoms, there are many excellent algorithms and packages to calculate it numerically for other materials. Three-dimensional visualization of charge density is challenging, especially when several molecular/atomic levels are intertwined in space. In a recent project, we explored one approach to this: the extension of an analglyphic stereo visualization application based on the AViz package for hydrogen atoms and simple molecules to larger structures such as nanotubes. I will describe these techniques and demonstrate the use of analyglyphic stereo in AViz, [1, 2]. The use of AViz dot-mode visualization for electronic density was first developed in an undergraduate project about the hydrogen atom[3]. We then visualized the electronic density resulting from simulations of larger molecules and solids in the same way. Further studies [4] used a den...
Visualization in three dimensions is invaluable for understanding the nature of condensed and flu... more Visualization in three dimensions is invaluable for understanding the nature of condensed and fluid systems, but it is not always easy. In nature it is hard to view sample interiors, but on computers it is possible. We describe and contrast two opposite approaches - “smoke” visualization for viewing interiors of liquid samples and interactive WebGL for solids and molecules. Both are extensions of earlier Technion Computational Physics group projects and complement and are interoperable with the recent SimPhoNy Fp7 project. They require only desktop hardware and software accessible to students. Examples and standalone instructions for both are presented, starting with sample creation and concluding with image galleries.
Journal of Physics A: Mathematical and General, 1989
New simulations involving up to nearly 109 sites for square lattice bootstrap percolation give a ... more New simulations involving up to nearly 109 sites for square lattice bootstrap percolation give a percolation threshold compatible with unity. In this model sites in a square lattice are initially occupied randomly, and then are removed if they have less than three occupied neighbours. The results are compared with those of similar models, such as that studied by Frobose (1989),
The formation of crystalline and amorphous solids is described using a simple glass bead demonstr... more The formation of crystalline and amorphous solids is described using a simple glass bead demonstration and a discussion of annealing and rapid quenching on a computer.
The spatial volume occupied by an atom depends on its electronic density. Although this density c... more The spatial volume occupied by an atom depends on its electronic density. Although this density can only be evaluated exactly for hydrogen-like atoms, there are many excellent algorithms and packages to calculate it numerically for other materials. Three-dimensional visualization of charge density is challenging, especially when several molecular/atomic levels are intertwined in space. In a recent project, we explored one approach to this: the extension of an analglyphic stereo visualization application based on the AViz package for hydrogen atoms and simple molecules to larger structures such as nanotubes. I will describe these techniques and demonstrate the use of analyglyphic stereo in AViz, [1, 2]. The use of AViz dot-mode visualization for electronic density was first developed in an undergraduate project about the hydrogen atom[3]. We then visualized the electronic density resulting from simulations of larger molecules and solids in the same way. Further studies [4] used a den...
Visualization in three dimensions is invaluable for understanding the nature of condensed and flu... more Visualization in three dimensions is invaluable for understanding the nature of condensed and fluid systems, but it is not always easy. In nature it is hard to view sample interiors, but on computers it is possible. We describe and contrast two opposite approaches - “smoke” visualization for viewing interiors of liquid samples and interactive WebGL for solids and molecules. Both are extensions of earlier Technion Computational Physics group projects and complement and are interoperable with the recent SimPhoNy Fp7 project. They require only desktop hardware and software accessible to students. Examples and standalone instructions for both are presented, starting with sample creation and concluding with image galleries.
Journal of Physics A: Mathematical and General, 1989
New simulations involving up to nearly 109 sites for square lattice bootstrap percolation give a ... more New simulations involving up to nearly 109 sites for square lattice bootstrap percolation give a percolation threshold compatible with unity. In this model sites in a square lattice are initially occupied randomly, and then are removed if they have less than three occupied neighbours. The results are compared with those of similar models, such as that studied by Frobose (1989),
The formation of crystalline and amorphous solids is described using a simple glass bead demonstr... more The formation of crystalline and amorphous solids is described using a simple glass bead demonstration and a discussion of annealing and rapid quenching on a computer.
Uploads
Papers by Joan Adler