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Jac Londe

A breakthrough on paper that's stronger than steel - 0 views

www.physorg.com/...ough-paper-stronger-steel.html

science graphite paper graphene

shared by Jac Londe on 26 Apr 11 - No Cached
  • paper that's stronger than steel
  • University of Technology, Sydney scientists have reported remarkable results in developing a composite material based on graphite that is a thin as paper and ten times stronger than steel.
  • Graphene paper (GP) is a material that can be processed, reshaped and reformed from its original raw material state - graphite.
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  • These graphene nanosheet stacks consist of monolayer hexagonal carbon lattices and are placed in perfectly arranged laminar structures which give them exceptional thermal, electrical and mechanical properties.
Jac Londe

Researchers create super-small transistor, artificial atom powered by single electrons - 0 views

www.physorg.com/...r-artificial-atom-powered.html

science nano Sketchset

shared by Jac Londe on 27 Apr 11 - No Cached
  • Researchers create super-small transistor, artificial atom powered by single electrons
  • The SketchSET—which is the first single-electron transistor made entirely of oxide-based materials—consists of an island formation that can house up to two electrons. The number of electrons on the island—which can be only zero, one, or two—results in distinct conductive properties. Wires extending from the transistor carry additional electrons across the island.
  • One virtue of a single-electron transistor is its extreme sensitivity to an electric charge, Levy explained. Another property of these oxide materials is ferroelectricity, which allows the transistor to act as a solid-state memory. The ferroelectric state can, in the absence of external power, control the number of electrons on the island, which in turn can be used to represent the 1 or 0 state of a memory element. A computer memory based on this property would be able to retain information even when the processor itself is powered down, Levy said. The ferroelectric state also is expected to be sensitive to small pressure changes at nanometer scales, making this device potentially useful as a nanoscale charge and force sensor.
Jac Londe

Daedalus Projects - 0 views

www.daedalus.nu

projects daedalus science tools copter

shared by Jac Londe on 30 Apr 11 - No Cached
  • CrazyFlie flight video
  • The copter itself is organised around the main CPU. The job of this CPU is to acquire the physical measurement given by the gyroscopes and accelerometers and to control the motors to keep the copter stable. This is done by a regulation loop which controls the motors speed 250 times per second. The radio communication has a pretty low bandwidth and is used to send commands to the copter and receive telemetry data from it. The CPU program can be updated by radio.
  • The computer runs control and telemetry programs. The control program reads the input from a game-pad and sends control commands to the copter. We also have programs that can configure the copter regulation parameters and log the measurements in order to make easier to tune the regulation. All the development is done on Windows and Linux. Indeed we are 3 to work on this project, two of us work on Linux and one is mainly on Windows. Using FLOSS permit to handle that in a very effective way. We are mainly using the GCC compiler from CodeSourcery for the copter program compilation, GNU Make for the project build, Mercurial for the source control, and python/pyusb for the communication with the copter. All these softwares works seamlessly on both Linux and Windows and made the project pretty easy to handle. The distance between the motors (horizontally and vertically) is around 8 cm and the total weight is around 20 g.
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  • The top of the board contains the sensors and the control/communication electronic: The JTAG/Serial connector permit to program the processor and to communicate debug messages. The Main CPU is a STM32 Cortex-M3. It is clocked at 64MHz from the internal oscillator. The 2 Axis X-Y Gyro is an invensense IDG500. It has an analog output and thus is connected to the CPU analog to digital converters. The 1 Axis Z gyro is an invensense ISZ500. As the X-Y gyro this is an analog chip connected to the CPU analog to digital converters. The 2.4GHz Radio is based on a nRF24L01+ chip from Nordic Semiconductor. It is actually a breakout board sold by SparkFun. The radio is connected to the CPU via a SPI port. The 3 Axis Accelerometer is a SMB380 from Bosch. It is connected to the CPU via an I²C bus.
  • Here nothing particular, except that the little battery is taped on the bottom of the copter. The battery comes from a Silverlit x-twin plane and actually permit 4.5min of flight time.
  • Under the battery we mostly have power supply and the “power” electronics: The charge connector accepts 5V and permits to charge the battery The power switch permits to power the copter either from the charge connector or from the battery. The 5V step-up permits to increase the power voltage from the 3~4V coming from the battery to 5V. The two 3.3V linear regulators, reduces the 5V to power the copter electronic. The digital and analog 3.3V are generated independently. This was made to reduce the noise on the analog components (here it is the two gyros, a quite critical part). Finally at the four sides we have the motors transistors. The power for the motors pass on the top and bottom of the part of PCB that hold the motors. It can be noted that we also have the battery charging chip just at the right of the 3.3V regulators. It is a classical MAX1555 and is working pretty well. The idea with the step-up was to get a more stable voltage when the battery is depleted and also to remove some of the noise coming from the motor electonic. Anyway, this boars is capable to work without by using 2.8V linear regulators instead. So most likely the step-up will be excluded on the next version and we also plan to integrate the radio on board. The motors and propellers are taken from a Silverlit X-twin plane. They are powered by the battery voltage.
  • The copter is controlled via a python program running on the PC. A Playstation bluetooth gamepad is used to pilote it.
Jac Londe

GlobalScale Technologies - D2Plug - 1 views

www.globalscaletechnologies.com/c-8-d2plug.aspx

technologies plug mpc cloud electronics tools onde science computer

shared by Jac Londe on 06 Jul 11 - No Cached
  • D2Plug is a Developer Kit for the Marvell PXA510 Highly Integrated SoC with PC-like performance.
  • The D2plug can be used by software developers, Independent Software Vendors (ISV), and System Integrators (SI); for evaluation, Application development, Rapid Prototyping, and interoperability testing for a “cloud” based service deployment. The complete solution in an attractive, innovative and “fan-less” enclosure will also be available for bundling solutions for product release with custom branding.
Jac Londe

Plug computer - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Plug_computer

computer plug electronics tools onde science cloud mpc

shared by Jac Londe on 06 Jul 11 - Cached
  • Plug computer
  • A plug computer is a small form factor server for use in the home or office. Compared to their PC-based counterparts, plug computers are lower cost, consume less power, often do not have a video card, and are intended to be powered up at all times
  • Suitable for running a media server, back-up services, file sharing and remote access functions such devices can be used as a bridge between in home protocols such as Digital Living Network Alliance (DLNA) & Server Message Block (SMB) and cloud based services.
Jac Londe

Arduino Cookbook on Amazon™ - 0 views

onsaleb.com/Buy-Arduino-126.html

socket rfid compactflash opensource tools science web2.0 electronics amazon

shared by Jac Londe on 02 Jul 11 - No Cached
  • Socket Communications CompactFlash RFID Reader Card 6E ( RF5400-542 )
  • Product Details Integrated Type II CF card plugs into the Type II CompactFlash slot of Windows Powered Pocket PCs Reads and writes to ICode 1, Tag-It HF and PicoTag proprietary HF tags Reads and writes to the most popular HF ISO 15693 tags, including ICode SLI/SL2, LRI512, my-d and Tag-It HF-I High frequency, 13.56MHz reader/writer Add plug-in RFID capabilities to Pocket PC applications
  • $186.60
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  • http://arduino. communicate with your arduino. from your arduino. com/products/10269
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