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Java applets simulations and comprehensive tutorials to help visualize various concepts in math, physics & engineering.

Signal Processing
	Fourier Series Applet Frequency analysis of periodic functions.
	Digital Filters Filters digital signals and plays the output on your speakers
Electricity and Magnetism: Statics
	2-D Electrostatics Applet Demonstrates static electric fields and steady-state current distributions.
	2-D Electrostatic Fields Applet Demonstrates electric fields in various 2-D situations; also shows Gauss's law
	3-D Electrostatic Fields Applet Demonstrates electric fields in various 3-D situations.
	3-D Magnetostatic Fields Applet Demonstrates magnetic fields in various situations.

Electrodynamics
	Basic Electronics Applet Some basic information about electronic circuits.
	2-D Electrodynamics Applet (TM) Demonstrates electromagnetic radiation, induction, and magnetostatics
	2-D Electrodynamics Applet (TE) Demonstrates electromagnetic radiation.
	Analog Circuit Simulator Applet Demonstrates various electronic circuits.
	Waveguide Modes Applet Electromagnetic waves in a waveguide.
	Analog Filter Applet Frequency response of circuits.
	Fresnel Diffraction Applet Generates Fresnel diffraction patterns.

Quantum Mechanics
	Hydrogen Atom Applet Shows the orbitals (wave functions) of the hydrogen atom.
	Molecular Orbitals Applet Shows the orbitals (wave functions) of the hydrogen molecular ion.
	1-D Quantum Mechanics Applet Single-particle quantum mechanics states in one dimension.
	1-D Quantum Crystal Applet Periodic potentials in one dimension.
	2-D Quantum Crystal Applet Periodic potentials in two dimensions.
	1-D Quantum Transitions Applet Radiative transitions (absorption and stimulated emission) in one dimension.
	Atomic Dipole Transitions Applet Radiative transitions (absorption and stimulated emission) in atoms.
	2-D Rectangular Square Well Applet Rectangular square well (particle in a box) in two dimensions.
	2-D Circular Square Well Applet Circular square well in two dimensions.
	2-D Quantum Harmonic Oscillator Applet Harmonic oscillator in two dimensions.
	Quantum Rigid Rotator Applet Particle confined to the surface of a sphere.
	3-D Quantum Harmonic Oscillator Applet Harmonic oscillator in three dimensions.

Linear Algebra
	Dot Product Applet Demonstrates the dot product or scalar product of two vectors.
	Matrix Applet Demonstrates 2-d transformations using a matrix.
Vector Calculus
	2-D Vector Fields Applet Demonstrates various properties of vector fields, including divergence and curl, etc
	3-D Vector Fields Applet Demonstrates vector fields in 3 dimensions. Includes the Lorenz Attractor and Rossler Attractor.
Thermodynamics
	Gas Molecules Simulation Applet Demonstrates the kinetic theory of gases.
	Thermal Camera Pictures Some sample pictures taken with a thermal (infrared) camera. (This is not an applet but I thought I'd throw it in here anyway.)
Miscellaneous
	A Sense of Scale Provides a visual comparison of various distances, from very small objects like protons and electrons, to distances between galaxies. (Not an applet, but I thought I'd include it here anyway.)
	Ordinary Differential Equations Applet Visual differential equation solver.
	Euler's Equation Applet Demonstrates Taylor series expansion of complex exponentials.

Oscillations and Waves
	Ripple Tank (2-D Waves) Applet Ripple tank simulation that demonstrates wave motion, interference, diffraction, refraction, Doppler effect, etc
	2-D Waves Applet Demonstration of wave motion in 2-D.
	Coupled Oscillations Applet Demonstration of longitudinal wave motion in oscillators connected by springs.
	3-D Waves Applet Demonstration of wave motion in 3-D.
	Dispersion Applet Dispersion and group velocity.
	Cavity Modes Applet Electromagnetic waves in a 3-d rectangular cavity.
	Antenna Applet Generates antenna radiation patterns.

Acoustics
	Loaded String Applet Simulation of wave motion of a string.
	Rectangular Membrane Waves Applet Vibrational modes in a 2-d membrane.
	Circular Membrane Waves Applet Vibrational modes in a 2-d circular membrane (drum head).
	Bar Waves Applet Bending waves in a bar.
	Vowels Applet The acoustics of speech.
	Box Modes Applet Acoustic standing waves in a 3-d box.
	Acoustic Interference Applet Generates audio interference between your speakers.