I am sure you have heard that the image of an object created on your eye’s retina is inverted (rotated by 180 degrees). The brain however has the ability to processes this information in such a way that makes you see things as they really are. This fact is remarkable and can give us a hint of how complex perception of reality is.
I started writing this post a few days ago after reading this article. It looked extremely interesting. The main idea is that in the Boston marathon there were thousands of mobile phones taking pictures and videos. The total duration and number of all videos and pictures shot could be stunning. This could be equivalent to thousands of witnesses testifying with absolute accuracy what they saw. The author was wondering whether crowd-sourcing could become a tool to crime solving. She probably meant to write modern crowd-sourcing as some forms of crowd-sourcing have been in use since long time ago as we will see further below. Continue reading Solving criminal cases through crowd-sourcing
Dose deposition to a medium may only be directly measured by the method of calorimetry. However, this is not what we do in practice. What is usually done is that we use an ionization chamber of some kind to measure exposure and then apply a series of correction factors in order to derive dose values corresponding to the measured exposure. Continue reading Calculation of radiation dose to a material by using an ionization chamber
This post is a tutorial on creating web presentations with free software. The software used is CamStudio (http://camstudio.org/) and optionally a web camera software called Yawcam (http://www.yawcam.com/). Yawcam is a camera software which can “stay on top” while you are presenting your slides. It is capable of showing your face or whatever is in front of your web camera during your presentation. So the end result will look somewhat like picture in picture functionality. The tutorial is given in video format below as well as in written instructions format. Feel free to follow whatever suits you best. Continue reading How to create web presentations using free software available online