This is a pretty cool video of how basic holograms are made. The only part I don’t like (other than the music) is when the person making the hologram puts his unprotected hand in the developer. Don’t do that!
This week we’re hearing about a laser pointer that way "laid" or "placed" (depending on who is transcribing the story that everyone is repeating) on a dermatology exam table and somehow sparked a fire that caused $200,000 in damages.
A few years ago I needed a variable power supply and found one at a local shop that would do +-5v, 12v and 0-12v dc. It was about $70 if I remember right. It’s similar to this model. The one I have isn’t sold by Omnitron any longer.
Somehow I broke it along the way (it smelled like I let the smoke out) and it stopped being variable and instead put out 16v on the variable side and normal levels on the non-variable side.
Last night I had the time to take a look at it and opened the puppy up.
The leaves themselves aren’t going to be working to keep the world clean and it remains to be seen how the process will be used in real products but researches at the University of Twente in the Netherlands have developed a laser process that can be used to duplicate the surface properties of the lotus leaf which can then be duplicated using current injection molding technologies.
The material used for the mold source is first blasted by a femtosecond laser to produce pits and then another pass is made to product very fine lines.
The combination of the two patterns produces a surface the is highly water resistant.
In ordinary hydrophylic surfaces a drop of water will wet the surface, which means that its contact area grows until an equilibrium is reached. On very hydrophobic surfaces however, the water will form a droplet, making as little contact as possible. This makes drops very mobile, just a slight inclination is enough to let the droplet roll away.
Another advantage to such surfaces is that in addition to staying relatively dry, they are self-cleaning. At the water falls away it will tend to take contaminants with it.