Wave energy securing airports - Science (9) - ABC Splash - Overview Electromagnetic radiation is energy that travels in waves. Some examples include gamma rays, X-rays, microwaves and radio waves. Watch this clip to learn more about the properties of energy waves, such as wavelengths, and how electromagnetic radiation is being used in airport security to see through people's clothes but not their bodies. How will this help detect hidden weapons? Duration: 2 mins 29 secs Source : BBC Learning area: Science Secondary: Year 9
Google Street View Hyperlapse Hyper-lapse photography – a technique combining time-lapse and sweeping camera movements typically focused on a point-of-interest – has been a growing trend on video sites. It’s not hard to find stunning examples on Vimeo. Creating them requires precision and many hours stitching together photos taken from carefully mapped locations. We aimed at making the process simpler by using Google Street View as an aid, but quickly discovered that it could be used as the source material. It worked so well, we decided to design a very usable UI around our engine and release Google Street View Hyperlapse. Problem of Reciprocity Back to main course page John D. Norton Department of History and Philosophy of Science University of Pittsburgh Background reading: J.
Colorful Convection Currents Fill two bottles with warm water from the tap and the other two bottles with cold water. Use food coloring or the Fizzers coloring tablets to color the warm water yellow and the cold water blue. Each bottle must be filled to the brim with water. Nature by numbers. The theory behind this movie We can find interactive sites on the internet (like this) to draw points, move them, and check how the structure becomes updated in real time. In fact, if we have a series of random dots scattered in the plane, the best way of finding the correct Voronoi Telesación for this set is using the Delaunay triangulation. And in fact, this is precisely the idea shown on the animation: first the Delaunay Triangulation and then, subsequently, the Voronoi Tessellation. But to draw a correct Delaunay Triangulation is necessary to meet the so-called “Delaunay Condition”.
Brydge iPad Keyboard Look again. This isn’t a MacBook. It’s an iPad and the new Brydge. Brydge is a device for your iPad that turns your handy tablet into a laptop. Physics Flash Animations We have been increasingly using Flash animations for illustrating Physics content. This page provides access to those animations which may be of general interest. The animations will appear in a separate window. The animations are sorted by category, and the file size of each animation is included in the listing. Also included is the minimum version of the Flash player that is required; the player is available free from The categories are: In addition, I have prepared a small tutorial in using Flash to do Physics animations.
Insulation Experiment: Keep Your Body Warm Ever wonder why your mom makes you wear two or three layers of clothing when you want to go outside and build a snowman? These clothes are actually great insulators, which mean they're made from materials that keep your body temperature from dropping. In this insulation experiment, you'll learn which fabrics help keep you warm on an icy winter day. Some weather conditions, such as rain, wind, and snow cause our bodies to lose heat. If you don't select the right materials to keep your body warm and toasty, you'll start to shiver from the cold. Judge: An IP-Address Doesn’t Identify a Person (or BitTorrent Pirate) A landmark ruling in one of the many mass-BitTorrent lawsuits in the US has delivered a severe blow to a thus far lucrative business. Among other things, New York Judge Gary Brown explains in great detail why an IP-address is not sufficient evidence to identify copyright infringers. According to the Judge this lack of specific evidence means that many alleged BitTorrent pirates have been wrongfully accused by copyright holders. Mass-BitTorrent lawsuits have been dragging on for more than two years in the US, involving more than a quarter million alleged downloaders.