Category Archives: STEM

Science, Technology, Engineering, and Mathematics

Jamming Grippers Combine to Form Robotic Elephant Trunk

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Jamming Grippers Combine to Form Robotic Elephant Trunk – IEEE Spectrum.

 

“Jamming” has to be one of the coolest new actuation techniques we’ve seen in the last couple years, and we’ve recently covered a bunch of fascinating implementations of it, including walking robots and grippers that can throw stuff. MIT may have just topped everyone by developing a robotic elephant trunk that’s strong, flexible, and, since it’s made mostly out of coffee grounds, absolutely dirt cheap.

The jamming technique was developed jointly at Cornell University, University of Chicago, and iRobot back in late 2010.

The elusive capacity of networks

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What makes that question particularly hard to answer is that no one knows how to calculate the data capacity of a network as a whole — or even whether it can be calculated. Nonetheless, in the first half of a two-part paper, which was published recently in IEEE Transactions on Information Theory, MIT’s Muriel Médard, California Institute of Technology’s Michelle Effros and the late Ralf Koetter of the University of Technology in Munich show that in a wired network, network coding and error-correcting coding can be handled separately, without reduction in the network’s capacity. In the forthcoming second half of the paper, the same researchers demonstrate some bounds on the capacities of wireless networks, which could help guide future research in both industry and academia.

via The elusive capacity of networks – MIT News Office.

Russian satellite’s 121-megapixel image of Earth is most detailed yet

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There’s been a long history of NASA-provided “Blue Marble” images of Earth, but now we’re getting a different perspective thanks to photos taken by the Elektro-L No.1 Russian weather satellite. Unlike NASA’s pictures, this satellite produces 121-megapixel images that capture the Earth in one shot instead of a collection of pictures from multiple flybys stitched together. The result is the highest-resolution single picture of Earth yet. The image certainly looks different than what we’re used to seeing, and that’s because the sensor aboard the weather satellite combines data from three visible and one infrared wavelengths of light, a method that turns vegetation into the rust color that dominates the shot.

via Russian satellite’s 121-megapixel image of Earth is most detailed yet | The Verge.

Anything Can Be A Touch Screen Thanks To Disney Research’s ‘Touché’

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The system, called Touché, has already been demonstrated in a number of impressive practical prototypes created by the researchers — from a “smart doorknob” that can sense precisely how it is being gripped and lock or unlock itself accordingly, to a container full of water that can detect when a person’s hand is skimming the surface or completely submerged to even a person’s own body, which can be turned into an input for controlling the volume of a smartphone or other digital music player.

via Anything Can Be A Touch Screen Thanks To Disney Research’s ‘Touché’ | TPM Idea Lab.

Raspberry Pi Review & Initial How-To Setup Guide

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We received a Model B ($35), which is powered by a Broadcom BCM2835 SoC that includes a 700MHz ARM1176JZF-S CPU core, 256MB of RAM and a Broadcom VideoCore IV GPU with OpenGL ES 2.0 that supports 1080p at 30FPS as well as H.264 and MPEG-4 high-profile decoding for smooth Blu-ray playback. Connectivity includes two USB ports, Ethernet, HDMI, RCA video, an SD card slot, a 3.5mm audio jack and two rows of 13 General Purpose Input/Output (GPIO) pins for further expansion.

via Raspberry Pi Review & Initial How-To Setup Guide – TechSpot Reviews.

Once the process is finished, a popup will notify you that the write was successful. Close the box, exit the application, unmount the SD card from your PC and attach it to the Raspberry Pi. Assuming everything went well, you’re ready to fire the device up. The first time the computer boots from the SD card it will automatically configure itself. It will then reboot and load up once again to the login screen.

The default username for Debian is pi and the password is raspberry. You can then load the LXDE desktop environment by entering startx. A few moments later, the desktop will load up as below:

The Traveling Salesman Problem

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Given a collection of cities and the cost of travel between each pair of them, the traveling salesman problem, or TSP for short, is to find the cheapest way of visiting all of the cities and returning to your starting point. In the standard version we study, the travel costs are symmetric in the sense that traveling from city X to city Y costs just as much as traveling from Y to X.

via The Problem.

Asteroid takeout—a one-billionaire mission to bring a 500-ton asteroid to Earth by 2025

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Visiting (and eventually mining) asteroids is viewed by space development advocates as an imperative stepping stone to making our way out into the solar system. One group of President Obama’s advisors, the Augustine Commission, counseled that a manned asteroid mission might bring the highest payoff per dollar spent in terms of science and essential skills for space exploration. A study was also commissioned to check the feasibility of bringing a small asteroid—on the order of 10,000kg—back to the International Space Station. It reported no showstoppers.

via Asteroid takeout—a one-billionaire mission to bring a 500-ton asteroid to Earth by 2025.

AFP: ‘Good chance’ for SpaceX April 30 launch to ISS: NASA

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The main goals of SpaceX’s flight include a fly-by of the ISS and a berthing operation in which the company’s reusable space craft, the Dragon, will approach the ISS and the crew aboard the orbiting outpost will use the ISS robotic arm to help it latch on.

The gumdrop-shaped Dragon capsule will carry 521 kilograms (1,148 pounds) of cargo for the space lab and will also aim to return a 660 kg (1,455 lb) load to Earth, said Michael Suffredini, International Space Station program manager.

via AFP: ‘Good chance’ for SpaceX April 30 launch to ISS: NASA.

rtl-sdr – OsmoSDR

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rtl-sdr is a commandline tool that can initialize the RTL2832, tune to a given frequency, and record the I/Q-samples to a file.

The code can be checked out with:

git clone git://git.osmocom.org/rtl-sdr.git

via rtl-sdr – OsmoSDR.

Software Defined Radio