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Kilian Muster
Visual Skulduggery & The Black Art
Visual Skulduggery & The Black Art

Kilian's posts

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Return of the living dead. If I had 2000 bucks lying around I'd buy the A-EON Amiga X5000 in a heartbeat. The Amiga is one of the most inspiring computers ever made. Live long and prosper!

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Damn! I totally missed towel day this year!

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…as if millions of voices sang along in groove and were suddenly awed to silence…

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Quo Vadis net neutrality? The way of the Dodo?

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Time to scratch Canada off the world map. They're a goner.

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Die Geister, die ich rief…

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I felt a sudden disturbence in the hypocrisy as if a million people slapped their forehead facepalming and were silenced again.

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Subscription model? Really? Why do you think did I ditched Adobe years ago? Time to ditch Sketch.

Affinity Designer will make a very nice replacement…

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Damn! And I just bought a bunch of LED light bulbs! ;-D
New Ultra Low Power Light Source Uses Carbon Nanotubes As Field Emitters

LED's are considered one of the most efficient method of producing light.   The 2014 Nobel Prize in Physics was awarded to researchers:
“for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources”

Scientists from Tohoku University in Japan have developed a new type of energy-efficient flat light source based on carbon nanotubes with very low power consumption of around 0.1 Watt for every hour's operation -- about a hundred times lower than that of an LED.  ⓐ

LED lights are renowned for their high efficiencies, but the fact that only a fraction of the photons they produce actually ends up illuminating the surrounding environment suggests that there is still much room for improvement. One alternative approach explored by Prof. Norihiro Shimoi and colleagues was to build a structure based on carbon nanotubes, one-atom thick layers of carbon folded into a cylindrical shape.  ⓑ

This new light source is more like an old fashioned cathode ray tube, that works by having a high energy source of electrons (field emitters, electron guns) that shoot electrons onto a phosphor coated surface, the surface then glows.  
The cathode ray tube or (CRT) is a vacuum tube containing one or more electron guns, and a fluorescent screen used to view images.  ⓒ

This state-of-the-art device has a diode-like structure like LEDs but, curiously enough, the way in which it produces light is actually closer to the cathode ray tubes used in the TVs and computer monitors of the past century. Under the influence of a strong electric field, each carbon nanotube acts as a tiny cathode ray tube that releases a high-speed beam of electrons from its tip. These electrons then hit a phosphor screen kept under vacuum and, in the process, release a small amount of energy that causes the phosphor to glow.  ⓑ

Field emission electron sources catch scientists' attention due to its ability to provide intense electron beams that are about a thousand times denser than conventional thermionic cathode (like filaments in an incandescent light bulb). That means field emission sources require much less power to operate and produce a much more directional and easily controllable stream of electrons.  ⓓ

Building the device was a fairly simple, low-cost process. The researchers started by mixing highly crystalline single-walled carbon nanotubes with an organic solvent and a surfactant compound. They then painted the mixture on the cathode and scratched the surface with sandpaper, which allows the electrons to more easily separate from the tip of the nanotubes.  ⓑ

The scientists say their simple, unoptimized device already achieved a good brightness homogeneity and fairly high lighting efficiency of 60 lumens per watt, which compares to around 100 lm/W for LEDs and 40 lm/W for organic LEDs, or OLEDs. With further development, this holds promise for cheaper, greener, and eventually, brighter devices that could compete with or surpass the performance of LEDs.  ⓑ

This research is described in the latest issue of the journal Review of Scientific Instruments.  (open access) ⓔ

ⓐAIP Publishing
Beyond LEDs: Brighter, New Energy-Saving Flat Panel Lights Based on Carbon Nanotubes

ⓑ Gizmag
Cheap, ultra low-power light source runs on just 0.1 Watts


ⓓ EurekAlert 
Beyond LEDs: Brighter, new energy-saving flat panel lights based on carbon nanotubes

ⓔ  Review of Scientific Instruments, Volume 85, Issue 10
Plannar light source using a phosphor screen with single-walled carbon nanotubes as field emitters

A new low-cost flat panel light source with extremely low power consumption could lead to brighter, cheaper and greener lighting (Photo: Tohoku University) 

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They should start selling real estate there. We'd have another bubble right away. Damn I want this in Tokyo right now!
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