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Comment: Re:What's the point of journals? (Score 1) 206

by Vario (#38839541) Attached to: Scientists Organize Elsevier Boycott

While I do not want to defend the journals I think your comparison with Bernie Madoff does not work here.

While he might have been well respected, he had an incentive to cheat and abuse the trust by putting the money in his own pocket. Why should any journal profit from suppressing or pushing a certain kind of research? It is more the other way around: as an editor I would be looking for breakthroughs and unusual findings as they increase the influence of the journal.

Comment: Skip the newspaper article... (Score 5, Informative) 326

by Vario (#38207878) Attached to: Physicist Uses Laser Light As Fast, True-Random Number Generator

The newspaper article is not giving any information that is not already included in the summary.

The paper is published in Optics Express, the abstract can be read here. The full article is behind a paywall unfortunately. The author claim that this concept could deliver random numbers at a rate of 100 GHz which is quite fast compared to other true random number generators out there that are based on thermal noise, radiation or other processes.

Comment: A non-issue with THz! (Score 1) 177

by Vario (#38192850) Attached to: Terahertz Wireless Chip Will Bring 30Gbps Networks

In short: THz penetrates your T-shirt (airport scanners) but not any thin drywall.

Roughly speaking for electromagnetic waves the higher the frequency the more light-like the radiation becomes. THz is close to infrared light, it will not penetrate much but can be used to transmit a lot of data because you can modulate it with a much higher frequency than standard 2.4 GHz wireless LAN. This comes at a price though, if a person walks through the line-of-sight between your notebook and the hypothetical THz wireless access point the signal will be cut off immediately. So it is a nice idea to replace HDMI cables or similar connections but might not work so well as a WLAN replacement.

There are also people working on modulating your LED lighting to transmit data without cables (OFDM Visible Light Wireless Communication Based on White LEDs) and this is a nice example that in the future we might use the whole available spectrum to transmit information and saturation will not be a big problem anymore.

Comment: I don't get it either. (Score 1) 115

by Vario (#37755574) Attached to: Microtouch: 8-bit Open Source Media Device

How is this possible with so little RAM? It has an image viewer app. A single 320x240 8 bit image is 75K and somehow the LCD needs that data for smooth scrolling at 25fps. So does the processor basically generates a few lines of pixels, sends those to the LCD and then continues rendering/reading from SD card the next few lines and manages all that at 25fps?

Comment: Re:faster than the speed of light??? (Score 1) 412

by Vario (#37515742) Attached to: Faster-Than-Light Particle Results To Be Re-Tested

1. Yes, they can see each other. Why should they not? You can hear a fighter jet flying faster than the speed of sound easily, similar here. But don't get confused: you will only ever be able to see the past "image" of the other object, this image is traveling towards you with c.

2. More than 1 year. Your idea of a rod is not quite right. Think of it like a big rubber band, then make it stiffer and stiffer. If you pull too hard you would rip off one end but in any case they would probably not notice it for way more than a year (speed of sound).

Comment: Re:Project - Mc Lab / Magic Chemist, in a Box. (Score 2) 85

by Vario (#37404716) Attached to: Algorithm Predicts New Superhard Materials

While this sounds good in theory there is one big problem with this:

Until today it is not possible to predict a complex molecule because of the number of interactions between the atoms and electrons.

There are at least a hundred different specialized algorithms that may predict certain properties but can fail completely on others. Additionally the physics of a single molecule might be quite different from a cube of the same material. These challenges keep a lot of condensed matter theoreticians busy since over sixty years and are most likely not solved with any amount of computing power. On the other hand there are ideas to use quantum computers, because they are basically a model of the real thing and maybe that will result in a breakthrough.

So while your proposal is a respectable idea it won't work so easily in practice. If you look at big research institutions a lot of chemist already sit in front of their computers and try to get something useful out of computational chemistry software and sometimes they even succeed but this is far from a certain process that would lead to results with a genetic algorithm.

Comment: Unless... (Score 4, Informative) 98

by Vario (#36979754) Attached to: Building Material Absorbs and Releases Heat

Yes, every material absorbs and releases heat.

The interesting bit here is something different though. I have never seen that someone wants to use a phase change material for buildings, but why not? For coffee cups this already works nicely. The walls of the mug contain a material that is undergoing some phase transition (liquid to solid, different crystalline structure, magnetic, etc.) at a temperature that is slightly below really hot coffee but still a nice drinking temperature.

What happens is the following: the thermal energy of the coffee gets absorbed quickly by the material, therefore cooling it down fast from really hot to a lower temperature. The material can store a large amount of thermal energy and releases it slowly so that the coffee stays at a constant temperature for much longer (gizmag article).

For a whole building this makes a lot of sense as well. It more or less acts as a large thermal reservoir, so that your wall temperature does not increase during the day and falls too much during the night. You could achieve a somewhat similar effect by using 20 inch stone walls but this might be a bit easier to incorporate into modern buildings.

Comment: Nice idea. (Score 1) 238

by Vario (#36915552) Attached to: Ask Slashdot: How Do You Protect Data On Android?

This sounds like a pretty nice and simple idea to me.

The extra amount of traffic does not matter, just a few bytes for the passwords and the delay does not really matter. Additionally that helps you if someone stole your phone as you could easily add some information about the current location.

One loophole is that you have to disable access/decryption instantly after your phone is missing, otherwise interception of the traffic would give the attacker the unencrypted password.

Ambiguity: Telling the truth when you don't mean to.

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