http://handcrafted.codes/ Physics, numerical programming, data science, and more Joel DeWitt http://www.w3schools.com/xml/xml_rss.asp#rssref Brackets en-us dewittjo@ecu.edu (Joel DeWitt) dewittjo@ecu.edu (Joel DeWitt) http://handcrafted.codes/favicon/favicon-16x16.png http://handcrafted.codes/ 16 16 Physics, numerical programming, data science, and more http://handcrafted.codes/amp/amp.htm This program solves the equation for the total energy of a simple pendulum to illustrate conservation of mechanical energy for large oscillations. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0001 Tue, 01 Jul 2014 05:16 GMT http://handcrafted.codes/discrete/discrete.htm This program obtains a numerical solution to the Lorenz equations via a common fourth-order Runge-Kutta method. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0002 Fri, 01 Aug 2014 16:30 GMT http://handcrafted.codes/driven/driven.htm This program solves the equation of motion of a driven damped linear oscillator to illustrate how a harmonic system responds to perturbation. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0003 Mon, 01 Sep 2014 09:14 GMT http://handcrafted.codes/Dreamweaver/Dreamweaver.htm This program provides range, initial kinetic energy, final kinetic energy, or linear energy transfer for a specified projectile-target combination. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0004 Thu, 01 Jan 2015 15:36 GMT http://handcrafted.codes/fermat/fermat.htm This program applies a simple variational Monte Carlo method to Fermat's principle of least time in geometrical optics. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0005 Sun, 01 Mar 2015 21:29 GMT http://handcrafted.codes/Doppelt/Doppelt.htm This program solves the coupled equations of motion of a double pendulum to simulate chaos for large amplitude oscillations. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0006 Fri, 01 May 2015 08:25 GMT http://handcrafted.codes/Boltzmann/Boltzmann.htm This program investigates some of the equilibrium properties of a one-dimensional classical ideal gas. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0007 Tue, 01 Sep 2015 13:37 GMT http://handcrafted.codes/Kepler/Kepler.htm What kind of curve would be described by a planet, supposing the force of attraction toward the Sun to be reciprocal to the square of the distance from it? dewittjo@ecu.edu (Joel DeWitt) physics item0008 Tue, 01 Dec 2015 01:06 GMT http://handcrafted.codes/planet2/planet2.htm This program simulates a miniature Solar system of two planets about a fixed Sun-like star. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0009 Fri, 01 Jan 2016 16:20 GMT http://handcrafted.codes/physics/physics.htm#physics01 Obtain the equations of motion for the double pendulum. dewittjo@ecu.edu (Joel DeWitt) classical mechanics item0010 Sun, 01 May 2016 16:17 GMT http://handcrafted.codes/RAID-1/RAID-1.htm These are some instructions on how to set up RAID-1 on a Linux system. dewittjo@ecu.edu (Joel DeWitt) cool stuff item0011 Wed, 01 Jun 2016 11:25 GMT http://handcrafted.codes/kt1/kt1.htm This program utilizes the Monte Carlo method to simulate the planar model on a square lattice using periodic boundary conditions. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0012 Mon, 01 Aug 2016 14:24 GMT http://handcrafted.codes/FEA/FEA.htm This is a demonstration of finite element analysis (FEA)--also referred to as the finite element method (FEM)--with a two dimensional argument as input. dewittjo@ecu.edu (Joel DeWitt) cool stuff item0013 Thu, 01 Sep 2016 08:49 GMT http://handcrafted.codes/dEdx/dEdx.htm This program provides stopping power and kinetic energy as a function of depth for a specified projectile-target combination. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0014 Fri, 09 Dec 2016 11:03 GMT http://handcrafted.codes/AIR/AIR.htm This is an adaption of a written report on atmospheric ionizing radiation (AIR). dewittjo@ecu.edu (Joel DeWitt) cool stuff item0015 Tue, 03 Jan 2017 12:39 GMT http://handcrafted.codes/Kepler/Kepler.htm#exoplanet How would one estimate the mass of an extrasolar planet, or exoplanet? dewittjo@ecu.edu (Joel DeWitt) physics item0016 Fri, 03 Mar 2017 10:24 GMT http://handcrafted.codes/Sternheimer/Sternheimer.htm This program calculates the Sternheimer density effect parameters using the prescription given in The International Journal of Applied Radiation and Isotopes 33(11), 1189 (1982). This utility is a companion to the Range-Energy Calculator. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0017 Thu, 04 May 2017 08:42 GMT http://handcrafted.codes/fermat/fermat.htm#Snell A demonstration of how Snell's law can be obtained from Fermat's principle of least time. dewittjo@ecu.edu (Joel DeWitt) physics item0018 Fri, 26 May 2017 09:14 GMT http://handcrafted.codes/Dreamweaver/Dreamweaver.htm#Bethe-Bloch A better introduction to the Bethe-Bloch formula. dewittjo@ecu.edu (Joel DeWitt) physics item0019 Sun, 25 Jun 2017 21:57 GMT http://handcrafted.codes/physics/physics.htm#physics02 A small mass m is supported by a vertical spring. When an additional 100 g is attached to the original mass, the system begins to oscillate at a frequency of 0.500 Hz. When the oscillations die out, the spring is found to have increased in length by 10.0 cm. Find m. dewittjo@ecu.edu (Joel DeWitt) classical mechanics item0020 Fri, 17 Nov 2017 12:01 GMT http://handcrafted.codes/physics/physics.htm#physics03 Can we approximate the speed of deep-water waves? dewittjo@ecu.edu (Joel DeWitt) classical mechanics item0021 Wed, 31 Jan 2018 11:31 GMT http://handcrafted.codes/planet2/planet2.htm#LEO Show that for a spherical planet of uniform density, the orbital period of a satellite in a low, circular orbit is independent of the planet’s radius but is inversely proportional to the square root of the planet’s density. dewittjo@ecu.edu (Joel DeWitt) physics item0022 Wed, 21 Feb 2018 11:30 GMT http://handcrafted.codes/Beta/Beta.htm This program provides electron stopping power as a function of kinetic energy in a specified target material. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0023 Wed, 2 May 2018 08:49 GMT http://handcrafted.codes/photon/photon.htm This article gives an overview of photon interactions with matter. dewittjo@ecu.edu (Joel DeWitt) physics item0024 Sat, 13 Oct 2018 16:50 GMT http://handcrafted.codes/TGAE/TGAE.htm This page describes how temperature changed as a function of time during the total solar eclipse of August 21, 2017. dewittis@students.pittschools.org (Isaac DeWitt) cool stuff item0025 Wed, 5 Dec 2018 09:22 GMT http://handcrafted.codes/Dreamweaver/Dreamweaver_notes.htm I've moved the Notes section of the Range-Energy Calculator to a separate page. dewittjo@ecu.edu (Joel DeWitt) physics item0026 Sun, 09 Dec 2018 19:13 GMT http://handcrafted.codes/discrete/discrete.htm This is a minor edit of "Higher-Dimensional Models" to include new information about Ellen Fetter and Margaret Hamilton, who were responsible for programming the enormous 1960s-era computer that would uncover strange attractors and other hallmarks of chaos theory. dewittjo@ecu.edu (Joel DeWitt) edit item0027 Wed, 12 Jun 2019 16:00 GMT http://handcrafted.codes/Dreamweaver/Dreamweaver.htm#calculator I've finally gotten around to adding a checkbox to the range-energy calculator to output units of MeV-cm2/g when computing linear energy transfer. dewittjo@ecu.edu (Joel DeWitt) edit item0028 Tue, 08 Oct 2019 08:20 GMT http://handcrafted.codes/amp/amp.htm The Simple Pendulum gets a refresh with some corrections. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0029 Tue, 17 Dec 2019 07:58 GMT http://handcrafted.codes/amp/amp.htm#Scratch The Simple Pendulum gets a Scratch translation! dewittjo@ecu.edu (Joel DeWitt) numerical programming item0030 Wed, 22 Apr 2020 09:16 GMT http://handcrafted.codes/photon/photon.htm#JS I've added a little JavaScript calculator for the photon interaction cross sections described on this page. dewittjo@ecu.edu (Joel DeWitt) physics item0031 Thu, 09 Sep 2021 19:49 GMT http://handcrafted.codes/AIR/AIR.htm#Radiation Added section "Radiation Environment in the Atmosphere" to the AIR report. dewittjo@ecu.edu (Joel DeWitt) cool stuff item0032 Fri, 14 January 2022 08:31 GMT http://handcrafted.codes/Sternheimer/Sternheimer.htm Tweaked the density effect calculator. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0033 Thu, 22 September 2022 21:04 GMT http://handcrafted.codes/roots/roots.htm This is a collection of programs that gives the roots of polynomials of varying degrees. dewittjo@ecu.edu (Joel DeWitt) cool stuff item0034 Sat, 25 November 2023 17:05 GMT http://handcrafted.codes/Ramanujan/Ramanujan.htm Here is a Ramanujan page for those of you that need more mathematical identities and continued fractions in your life. dewittjo@ecu.edu (Joel DeWitt) cool stuff item0035 Thu, 28 November 2024 10:20 GMT http://handcrafted.codes/AIR/AIR.htm#Showers Added section "Air Showers" to the AIR report. dewittjo@ecu.edu (Joel DeWitt) cool stuff item0036 Thu, 26 December 2024 11:23 GMT http://handcrafted.codes/Dreamweaver/Dreamweaver.htm Modest refresh of the range-energy calculator. dewittjo@ecu.edu (Joel DeWitt) numerical programming item0037 Tue, 14 April 2026 21:28 GMT