Aleph Null | Open Source Technology and Mathematics

Fix battery issues on HTC Desire 601 since software update 4.4.2

Ben Linsey-Bloom - Aug 29, 2014 - 10:07am

I’ve had an HTC Desire 601 for a few months now and have generally been very happy with it. Generally the battery has lasted about 30 hours with minimal use, but last week HTC released a software update which meant battery the battery life went to about 6 hours without me even using it!

Add New CommentRead More

Monitoring a Windows machine via Nagios

Josh Palmer - May 28, 2014 - 5:03pm

In this post, I detail how to setup Nagios to monitor a Windows machine via NSClient++

Prerequisites:

A working Nagios install, configured on a server with a fixed IP
The latest NSClient++ MSI Installer

NOTE: At time of writing, the latest version of NSClient++ is 0.42 and is recommended as 0.41 has issues with binding to IPv4 addresses

Add New CommentRead More

Compiling mixed Sage and Python code with Cython

Pete Donnell - May 14, 2014 - 4:26pm

At the moment I’m working on some maths code written in a combination of standard Python and its mathematical superset, Sage. The code is fairly computationally expensive (it’s essentially a brute force search for chemical reaction networks that are monotone). Consequently, after getting the code working as a proof-of-concept, I wanted to compile it to C using Cython to get a bit more speed out of it. I found the documentation on converting Sage and Python scripts to Cython a bit vague, particularly when it comes to combining the two, so this article gives step by step instructions based on my findings.

Add New CommentRead More

Presentation on mozjpeg

Ben Linsey-Bloom - Apr 28, 2014 - 4:42pm

I just gave a presentation on Mozilla's new JPEG-improving project mozjpeg as part of my 'image technology' module at university. We had to chose an emerging technology to research and present to the class in pairs.

Add New CommentRead More

Upgrading Moodle to a newer branch using git

Pete Donnell - Mar 13, 2014 - 6:45pm

In this post, I describe how to upgrade a Moodle installation from one major version to a newer one using the command line and git.

Add New CommentRead More

Maxima function to calculate the second additive compound of a square symbolic matrix

Pete Donnell - Mar 06, 2014 - 1:25pm

In this post, I present a function to calculate the second additive compound of a square matrix using the symbolic algebra program Maxima.

Add New CommentRead More

Installing Ubuntu 12.04 LTS on a Dell Windows 8 machine with UEFI

Joe Parker - Mar 01, 2014 - 1:14pm

Enticing a Windows 8 installation to dual-boot happily alongside Ubuntu on a UEFI-enabled Dell machine

Add New CommentRead More

Introducing CoNtRol: an open source web application for analysing Chemical Reaction Networks

Pete Donnell - Feb 24, 2014 - 7:45pm

I’m very excited to announce the public release of CoNtRol, a web application designed to carry out mathematical analysis of chemical reaction networks. A formal introduction has been accepted for publication in Bioinformatics, and technical documentation is available on the reaction networks wiki. In this article I want to talk a bit about the design philosophy behind CoNtRol.

Add New CommentRead More

Migrating a Drupal site from a single site to multi-site install

Pete Donnell - Nov 20, 2013 - 8:03pm

In this post, I describe how to move a Drupal based website from a single site installation to a multi-site installation. The instructions are centred on Debian/Ubuntu, but should be easy to adapt to other setups.

Add New CommentRead More

SSL/TLS version conflict between Zarafa and monit

Pete Donnell - Jun 18, 2013 - 5:02pm

We run monit on a number of clients' Linux systems to ensure that all their server daemons keep running as necessary. In this post I describe an issue that arises due to conflicting default SSL/TLS protocols in Zarafa and monit, along with a monit configuration change to work around the issue.

Add New CommentRead More

Pages

Search form