Porter S Five Forces Model

The EJS Shapley's Globular Clusters Model shows the distribution of globular clusters around the plane of the Milky Way as determined by Harlow Shapley in 1918. The Space View frame shows a 3D view of the distribution of the clusters around the galactic plane, along with the location of the Sun...

The Galileo's Moon Mountain Model illustrates the method used by Galileo to measure the height of a mountain on the Moon. Using his improved telescope design, Galileo was able to see spots of light in the otherwise dark potion of the Moon. He interpreted these spots as mountain peaks which caught...

The EJS Herschel's Star Gages Model illustrates William Herschel's methods of "star gages" by which he attempted to map out the shape of our galaxy in 1785. Herschel's star gages (sic) relied on two important assumptions: that Herschel's telescope (his "large 20 foot" with an 18.5 inch aperture)...


Platforms: Mac

Earth is under fire by Colossus, a battleship the size of a city. Using powerful laser cannons, it has destroyed most of Earth's defence forces, while its many troops clean up the rest of the planet. All expect for 5 warriors. The Battletoads, who are well aware of evil forces in the galaxy, join...


Platforms: Windows

In the majority of cases, a customer doesn't do a specific search for a product or model name. Instead, he just types in any word that describes what he is looking for. Now instead of browsing only in the product's name or model name, this search box also by default searches through the product's...


Platforms: Windows, *nix, PHP, BSD

Math::Telephony::ErlangC is a Perl extension for Erlang C calculations. SYNOPSIS use Math::Telephony::ErlangC; # Evaluate probability that a service request will have to wait $wprob = wait_probability($traffic, $servers); # Probability that the wait time will be less than a fixed maximum...


Platforms: *nix

Math::Telephony::ErlangB is a Perl extension for Erlang B calculations. SYNOPSIS use Math::Telephony::ErlangB qw( :all ); # Evaluate blocking probability $bprob = blocking_probability($traffic, $servers); $gos = gos($traffic, $servers); # Same result as above # Dimension minimum number...


Platforms: *nix

PHP. It contains a structured library of extensible components for modelling real world objects and processes. Paragon is a 3-tier system defining an abstraction between the presentation, business logic and data access layers and employs a simplified Model-View-Controller design paradigm....


Platforms: Windows, Mac, *nix, PHP, BSD Solaris

This module improves the results of the search module for the Italian language.It is an implementation of Martin Porter's stemming algorithm for Italian language (the customized algorithm can be found here).It is based on an original php code written by Roberto Mirizzi...


Platforms: PHP

The Point Charge Forces in One-Dimension model investigates the electric force that one charged particle exerts on another. It is a very simple representation that promotes understanding of Coulomb's Law in three ways: First, students can set the amount of charge on each particle and view vector...


Platforms: Mac

The Newton's Law of Cooling model computes the temperature of an object of mass M as it is heated by a flame and cooled by the surrounding medium. The model assumes that the temperature T within the object is uniform. This lumped system approximation is valid if the rate of thermal energy...


Platforms: Mac

The Point Charge Forces in Two-Dimensions model investigates the electric force that a charged particle experiences in a two-dimensional situation, because of four other nearby charged particles. The net electric force is shown as an arrow attached to the particle. Note that each particle can be...


Platforms: Mac

Americas Army is one of the five most popular action games played online. It provides players with the most authentic military experience available, from exploring the development of Soldiers in individual and collective training to their deployment in simulated missions in the War on Terror....


Platforms: *nix

Genre: Action About America s Army: Special Forces Players virtually explore the development and employment of Special Forces Soldiers. To be released in a series, the first portion is titled America's Army: Special Forces (Special Forces Assessment and Selection) and available now with six new...


Platforms: Mac

The Kepler System model simulates Kepler's final theory of planetary motion. In this theory the planets orbit in ellipses with Sun at one focus (Kepler's First law). These elliptical orbits are not necessarily all in the same plane. A line from Sun to the planet sweeps out equal areas in equal...


Platforms: Mac

The Ejs N-body Orbits model displays the dynamics of three to five identical masses orbiting each other subject to Newtonian gravity. The simulation displays the periodic orbital motion of the masses. The initial configuration of the system can be changed via slider. You can modify this...


Platforms: Mac

Your goal in Five-in-a-row is to get five X's in a row while preventing your opponent from getting five O's in a row. In this javascript implementation, the game is played on a 15x15 board. (If you'd like a bigger or smaller board, you can set it to any size from 10x10 through 20x20.) You play...


Platforms: JavaScript

This model simulates three phase five level diode clamped PWM inverter. FFT analysis is performed using the power GUI tool of power system.


Platforms: Matlab

The Rocking Semicircular Hoop model shows the dynamics of a simple object rocking without slipping on a horizontal surface. It is a supplemental simulation for an article by Leaf Turner and Ari Turner "Asymmetric rolling bodies and the phantom torque" in the Am. J. Phys. 78, 905 (2010). The...


Platforms: Mac

The EJS Equinox Precession model illustrates the Copernican theory of Earth's orbit around the sun. The top window shows a view from outside the celestial sphere. The simulation shows the moving Earth along with its axis or rotation and the line of sight from Earth, through Sun, to the Celestial...


Platforms: Mac