ON MAY 25th 2012 a Californian firm called SpaceX made the first privately run supply mission to the International Space Station (ISS). It was a vindication of NASA’s decision to outsource such missions to the private sector. Still, purists could argue that something was missing: a proper market has competition, but SpaceX was the only firm capable of doing it.
That may be about to change. On April 21st, at NASA’s Wallops flight centre in Virginia, another rocket built by another firm—Virginia-based Orbital Sciences—lifted off from the pad, after several delays.
Admittedly, the flight was only an initial test. The Antares went nowhere near the ISS itself. Nor was it carrying one of Orbital’s Cygnus space capsules, which, if all proceeds according to plan, will one day perform the actual docking with the ISS. But it is an important step: if everything continues to go well, then a Cygnus test flight may take place in a few months’ time, and Orbital’s first ISS resupply mission could happen before the end of the year.
Infographics are interesting–a mash of (hopefully) easily-consumed visuals (so, symbols, shapes, and images) and added relevant character-based data (so, numbers, words, and brief sentences).
The learning application for them is clear, with many academic standards–including the Common Core standards–requiring teachers to use a variety of media forms, charts, and other data for both information reading as well as general fluency...
"Our last tests were a little rushed and we didn’t have time to take any shots outside. So we did another lens test this week using natural light. And to our surprise, the most flattering lens was the 38mm, which was our least favorite lens in the earlier test. We think this is because of the color temperature/CRI. We’ll be running more precise tests soon, and Kish is constructing special testing equipment to help finalize that process.
We shot these tests at Pershing Square in downtown LA from about 4PM to 5PM. The white box denotes the S16 frame, everything outside is the micro 4/3 frame."
Edcanvas is a web service that provides you with an online canvas where you can add videos, photos and links to websites. Edcanvas provides integration with many famous services for importing content, such as YouTube, Dropbox, Google Drive, Flickr and others. This canvas can be used for various purposes such as creating an online presentation, sharing your uploaded PowerPoint presentation, for creating educational content for your students to share it with them via the internet and more. The possibilities for which you can use this web service are virtually unlimited.
When a team of University of Illinois engineers set out to grow nanowires of a compound semiconductor on top of a sheet of graphene, they did not expect to discover a new paradigm of epitaxy.
The self-assembled wires have a core of one composition and an outer layer of another, a desired trait for many advanced electronics applications. Led by professor Xiuling Li, in collaboration with professors Eric Pop and Joseph Lyding, all professors of electrical and computer engineering.
Nanowires, tiny strings of semiconductor material, have great potential for applications in transistors, solar cells, lasers, sensors and more. "Nanowires are really the major building blocks of future nano-devices," said postdoctoral researcher Parsian Mohseni, first author of the study.
"Nanowires are components that can be used, based on what material you grow them out of, for any functional electronics application."
Li's group uses a method called van der Waals epitaxy to grow nanowires from the bottom up on a flat substrate of semiconductor materials, such as silicon. The nanowires are made of a class of materials called III-V (three-five), compound semiconductors that hold particular promise for applications involving light, such as solar cells or lasers.