vineri, 28 februarie 2014

Ce poti face cu un Raspberry Pi ?

vineri, 14 februarie 2014

Supercomputer - 40-Node Raspberry Pi Cluster

Here are the specifications of the final system:

40 cores Broadcom BCM2835 @700 MHz
20 GB total distributed RAM
5 TB disk storage – upgradeable to 12 TB
~440 GB flash storage
Internal 10/100 network connects individual nodes
Internal wireless N network can be configured as an access point or bridge.
External ports: four 10/100 LAN and one gigabit LAN (internal network), 1 router uplink
Case has a mostly toolless design, facilitating easy hot-swapping of parts
Outer dimenions: 9.9″ x 15.5″ x 21.8″.
Approximate system cost of $3,000. (The first one cost slightly more.)
Oricine își poate construi un super computer !!

miercuri, 12 februarie 2014

Quantum Internet

WTF?? Ce o mai fi si asta ? Ei bine se pare ca cercetătorii europeni au reușit sa teleporteze pe o distanta de 12 km un "Quantum Memory" , adică informație ... Sincer e destul de greu de înțeles pentru ca tine de fizica cuantica dar ce e demn de reținut este următoarea parte :
"One of the main requirements for widespread teleportation is entangled photons with a wavelength compatible with telecom fiber. That’s not so easy to produce since the entangled photons must be compatible with the discrete energy jumps in the quantum memory. “This wavelength is typically far away from the low-loss region of standard optical fiber,” say Bussières and co.
So the trick these guys have perfected is to generate entangled pairs of photons with different wavelengths. The first has a wavelength of 883nm (near-infrared), which is compatible with a type of quantum memory made of neodymium-doped yttrium orthosilicate crystals. The second has a wavelength of 1338nm (mid infrared), which passes easily through telecoms optical fiber.
The quantum state to be teleported is the polarization of a 1338nm photon. So these guys send the 883nm signal to the quantum memory where it is stored while transmitting the 1338 signal through a 12 km fiber to another apparatus that prepares a third photon (also at 1338 nm) with the polarization to be teleported.
This is when the teleportation takes place. When these two 1338nm photons are made to interact in a certain way, the polarization is teleported to the quantum memory at the other end of the experiment."

Tocmai s-a semnat certificatul de nastere al unui nou tip de internet - "Quantum Internet". Sa fie într-un ceas bun! :) E extraordinar cat de repede evoluează știința și tehnica ...
Articolul complet îl găsiți aici.

joi, 6 februarie 2014

NAS home made

NAS - Network attached storage bazat pe Cubietruck

1. Placa de baza - Cubietruck 104.99 $ = 351 lei
2. Carcasa - Compatibila Cubietruck 20 $ = 67 lei
3. HDD 2.5" - HDD Laptop Western Digital Blue WD10JPVX 1TB, SATA III, 5400rpm, 2.5" - 279,00 lei
4. Software - FreeNAS Gratis

Total estimat: 697 lei

miercuri, 5 februarie 2014

We Are the ROS. You Will be Assimilated. Resistance is Futile.

Comunitatea Open source vine cu un sistem de operare denumit ROS (Robot Operating System) care pune la dispoziția dezvoltatorilor biblioteci și drivere software pentru roboti.
1. Documentatie http://wiki.ros.org/
2. Tutoriale http://wiki.ros.org/ROS/Tutorials
3. Lista de pachete software http://www.ros.org/browse/list.php
4. Platforme http://wiki.ros.org/ROS/Installation
A început asimilarea :)