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Во время эксперимента по изучения долговременной активности нервной системы человека обнаружился интересный эффект. Замер гальванической реакции кожи (изменение электрического сопротивления) у студента показал, что во время занятий в университете симпатический отдел вегетативной нервной системы демонстрирует меньшую активность, чем даже во сне. Примерно такая же «нулевая» активность отмечена во время просмотра ТВ.
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How we missed this one is anybody’s guess, but one of the presentations at DEFCON last year covers a DIY radar build. [Michael Scarito] talks about the concepts behind radar, and then goes on to show that it’s not too hard or expensive to build a setup of your own. We’ve embedded his 45 minute talk after the break.
The two large pieces of hardware above should look familiar. They’re descendents of a favorite hacking project, the cantenna. The can-based long-range antenna is most popular with WiFi applications, but we’ve seen it used for Bluetooth as well and it’s not surprising to see it here. The rest is a lot of sensing hardware and enough math crammed into the coding to make your ears droop.
If you make it far enough (exactly 39 minutes into the talk) [Michael] shares some links for more information on the build. We think living vicariously is enough for us, but if you manage to build your own setup don’t forget to post a project log!
[via Dangerous Prototypes]
Yet another Fallout post here on Hackaday. This time, instead of the PIP-Boy, someone has built a fantastic prop for the iconic Nuka-Cola. The circuit is super simple, really just an LED array to light up the beverage just right. The construction of the base is quite nice though. If you’re a fan of functional props, or at least semi-functional (we doubt it tastes very refreshing), you’ll enjoy the build.
In case you’re wondering just what is in that bottle, it is basically just tonic water. For those who are unaware, tonic glows under UV light. [Kfklown] did add a few drops of paint to get the perfect color though. You’ll note that there are red and blue LEDs in the base as well as UV for color as well.
Filed under: news
Хабы: Ненормальное программирование
Американский музыкант положил на музыку математическую константу под названием Тау. О необычном подходе к числам пишет New Scientist.
Число Тау в два раза больше числа Пи и приближенно равно 6,283185. Майкл Блейк присвоил нотам от до одной октавы до ноты до следующей октавы номера от 1 до 8. Затем Блейк взял запись числа Тау с точностью до 126 знака после запятой и проиграл ее в соответствии с выбранной кодировкой нот. Далее музыкант аранжировал получившуюся мелодию.
Как сообщалось ранее, Блейк положил на музыку само число Пи. Однако по мнению композитора Тау звучит более гармонично.
Под катом видео
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[rue_mohr] is building a hexapod robot, and that meant he needed to tin a whole bunch of ribbon cables with solder. Using a soldering iron for this task would take far too long, so he built a homebrew solder pot to tin all those wires quickly. While [rue] was able to get solder on all those wires quickly, we need to question his method – he used a halogen light and reflector to melt all that solder.
The build began with a recycled halogen light fixture. After taking apart the entire assembly, [rue] reassembled it into something resembling a solder pot; a concave reflector and halogen light bulb sit perfectly flat on the table, ready to accept pieces of solder.
After throwing the switch and putting a few bits of solder in the reflector, the solder pot surprisingly worked. [rue] was able to quickly tin his ribbon cables, and the halogen bulb and reflector didn’t break yet.
This is one of the least safe solder pots we’ve ever seen – the bulb could easily explode, and melted solder could come pouring out of the reflector at any time. [rue] is aware of the safety implications and make sure to wear a pair of goggles. If it works though, we really can’t complain.
Check out the video of [rue]‘s solder pot (with an awesome temperature indicator light right in the middle of a pool of solder) in action after the break.
Filed under: tool hacks
As a web developer and designer, [Victor] has a habit of putting a very nice ASCII signature in an HTML comment at the top of every web page he designs. He was inspired by seeing others do this, and this piqued his curiosity to see who else was doing this. His idea was to scan through a chunk of the Internet and see what other web pages had ASCII signatures in an HTML comment. With a lot of very clever work, [Victor] managed to grab some interesting ASCII art that would have been missed without looking at the source of millions of web pages.
After gathering a list of the top million top-level domains from Alexa, [Victor] wrote a script to download the HTML for all the pages in parallel. After that, it was just an issue of detecting the ASCII art in all the HTML files. There were a few earlier ASCII art detection algorithms, but nothing that suited [Victor]‘s use case. The best result came from only looking at the first comment (otherwise the signatory wouldn’t want you to find it with a quick glance at the source) that were at least 3 lines long and 40 characters wide. After discarding everything with HTML tags in it, [Victor] had an awesome gallery of the ASCII art from webpages all around the Internet.
What did he find? Well, there’s far too many ASCII signatures for [Victor] to put up on his webpage, but he did provide a nice sample of what he found. They’re mostly logos, although there is a Hypnotoad and Aperture Science sentry turret in there.
If you’d like to try out [Victor]‘s script, he made everything available on GitHub.
Filed under: Software Development
If you’re a home hardware hacker in the United States, chances are most of your electrical components come from Mouser or Digikey, your hardware and tools from Grainger, and your raw materials from McMaster-Carr. This setup is great – we’d hate to locally source parts for a robot – but organizing larger orders can be a bit of a pain. Enter Amazon Supply, the new place to buy business and industrial equipment.
Right now the selection is a little thin, but if you’re looking for a single place to buy a quality soldering iron, a 0.005″ endmill or a set of brass balls, now you’ve got a one stop shop with the insanely fast shipping Amazon has won our hearts with.
While Amazon Supply isn’t selling even the most basic electrical component, the service was just launched, and if there’s a market, [Bezos] will go after it. Time will tell if our beloved vendors have a serious competitor on their hands.
Thanks [Vasili] for sending this in.
Filed under: news
[Linus Torvalds] pumped out Linux roughly 20 years ago and has now won some pretty major recognition for his contributions. We’ve seen different flavors of Linux installed on virtually everything you can think of, even on a dead badger. This prize is being compared to the Nobel Peace Prize, since there isn’t a Nobel prize for technology(why not?).
While some might be wondering what the big deal about Linux is, consider this quote from the ZDnet article for a moment.
Is it deserved? Well, judge for yourself. Since Torvalds created Linux in 1991, it has become the world’s most ubiquitous operating system it powers the popular Android phones and eight out of 10 financial trades; it runs Amazon, Facebook, Google, Twitter and other major web networks. It is the dominant OS for supercomputers, supporting nine of 10 of these major systems, and is the preferable platform for cloud computing.
Filed under: linux hacks
Most people we know had at least one phase where they dreamt of working for NASA. That dream may have faded for many of us, but it could suddenly be a real possibility again with a tournament NASA is holding. The goal is to sift through all of the data that they have collected; roughly 100 terabytes of pictures, telemetry data,
top secret pictures of martian yeti, and models. All of this information was gathered over different missions, on different instruments, in different formats. It is a mess. Take this data and make it easily accessible to both scientists, and non-scientists. They want their information to be useful and compelling to the world.
The grand prize for your fantastic final result is $10,000 and the title of “Space Coder of the Galaxy 2012″. I know I’d settle for a week at space camp.
Note: I just noticed the following bit:
And one talented high school winner will receive a special VIP invitation from NASA
I’m not sure if that means this is for high schoolers only, but I’m pretty sure it means a lot of them won’t identify with that space camp link above.
Filed under: contests