**Paez Research Group (C. E. Yaguna, J. Zuluaga)**

(University of Antioquia, Medellin)**Landau Research Group**

(Oregon State University)- Programs from Landau and Paez,
*Computational Physics* - Lnked to source and Java codes.
- Applets activated from frame on left.

**Classical scattering from four (attractive or repulsive) force centers. See the hypersensitivity of scattering angle to impact parameter (or view the source code: Disper2.java).**

**eqstring.c, .java: A string is pulled and released. The initial string shape can be adjusted with the aid of scroll bars. (Standing wave if plucked in middle, travel at end.)****strsin.java: A normal mode solution to the wave equation (initial string shape is a sine wave).****twopeaks:The solution for two initial peaks.**

**eqheat.c, .java: The cooling of a bar initially at 100 degrees when it its end are set to 0 degrees.****twobars.java: The cooling of two bars in contact with different initial temperatures and ends fixed to 0 degrees.****barsin.java: The cooling of a bar with an initial sine distribution of temperatures and ends fixed to 0 degrees. Red denotes positive temperatures and blue negative.**

**harmos.f, .java: Wave packet in harmonic oscillaton potential.****sqwell.f, .java: Wave packet in infinite square well. (Eventually becomes chaotic.)****Asymetric wavepacket.f, .java: Asymetric wave packet in infinite square well.****Potbar.f, .java: Adjustable Wavepacket hitting adjustable barrier.****KronP.f , .java: Wavepacket hitting Kronig Penny potential.**

**qmc.c****,
.f,
Feynman path integral calculation (Monte Carlo simulation) of
harmonic oscillator ground state. See the fluctuations in the
classical trajectories as they generate the wave function.**

### KdeV Solitons (Non Linear PDE)

**soliton.f, .c, .java Solitons form as wavefront propagates.****sierpin.c, .java: Sierpinski Gasket. (Watch it grow.)****tree.c, .java: A fractal tree.(Watch it grow with an apple and moon.)****fern.c, .java: A fern fractal.****film .c, .java: Bilingual ballistic deposition of a film onto a surface with determination of fractal dimension.****column.c, .java Ballistic deposition onto a surface with correlated growth. The new deposited particle attracts other particles.****dla.c, .java: Diffusion limited agregation. A particle starts at a random point in a circle, a Gaussian random walk is generated, and if it finds another particle, it sticks to it. (Bell rings at center.)****Chaotic Scattering****Young's 2 Slit Interference****Hertzsprung-Russell Diagram****Photoelectric Effect****Lissajous Figures**

**area.c****,
.f, .java.
Calculation of area of any shape via Monte Carlo "stone throwing" (basis of vonNeuman rejection).
**