|Dr Ian Robinson|
|Physics Projects 'n Stuff|
One of my sons coded a prime number generator using the ancient Sieve of Eratosthenes algorithm in python. This and conversations about programming languages led me to a speed-test of such a numerically intensive task in python vs. Fortran.
A program was developed first in Fortran, then translated to python attempting to maintain the same data-types and loop methodology. No significant attempt was made to optimise the algorithm. Note, these programmes do not output the results, this to eliminate language differences in write times.
For results in python and fortran see Blog page post on 30/1/22.
Last updated (30/1/22) - Download
sonify_mseed is a simple python program which converts seismic data in .mseed format to an audio file with the seismic values mapped onto a frequency range.
The code can read in either a single .mseed file or an entire directory which it then concatenates. Data are mapped onto a frequency range and the time may be compressed by some user defined factor. e.g a day compressed by a factor of 1000 results in about 80 sec of audio.
The code is not very elegant in its use of python though has been written to hopefully be easy to follow and adapt.
Last updated (9/1/22) - Download
A project to build and interface a precision digital protractor to a Prismatic-H82 Faceter (similar to a Polyhedron Scintillator) giving a resolution of 1/40 degree. The system employs a US Digital E6 Optical Encoder, Arduino Nano and Waveshare 1.5" colour OLED display.
This may be of interest to those interested in adding such a system to a faceting machine or any device where the angle of rotation needs to be measured . The code may be adapted to read from other rotarty optical encoders. It also may provide a template for those wishing to drive the Waveshare OLED display for other projects.
n.b. the Arduino sketch is adapted from Tom Herbst's excellent code described in his highly recommended 'Amateur Gemstone Faceting vol 2' -link. Any errors introduced are my own.
All the above in one zip archive (updated 31/12/20) - Download
Stable well-tested code suitable for long-term recording of such as seismic data. This be easily adapted to record a range of input signals periodically producing plots for uploading to the web. Data are saved timestamped .mseed format for ease of analysis by standard seismic software.
All the above in one zip archive (updated 17/10/20) - Download
An opensource educational project this involves the construction of a static or portable high resolution Infrasound monitoring station.
The software & hardware has been tested over the past couple of years and is solid..
All the below in one zip archive (updated 30/8/21) - Download
This is a well-established opensource project to build a nT resolution earth field magnetometer. The system effectively monitors changes in the solar wind and could be used to predicit aurora as well as being a testbed for further development.
All the below in one zip archive (updated 25/4/21) - Download
Poster presentation given at mh2014 -the 14th International Symposium on Metal-Hydrogen Systems - Poster
Horrifically underdocumented isotope diffusion code - available on request.