Physics

Crash! Scientists explain what happens when nanoparticles collide

New research on the events that occur when tiny specks of matter called nanoparticles smash into each other could one day inform the development of technologies such as earphones that protect people from damaging noises or devices that convert 'junk' energy into usable power.

Physicists demonstrate demixing behavior of rotating particles

Physicists from Friedrich-Alexander-Universität Erlangen-Nürnberg and Heinrich-Heine Universität Düsseldorf have demonstrated that demixing occurs in systems made up of macroscopic particles rotating in opposite directions and that particles turning in either a clockwise or counter-clockwise direction form homogeneous groups. The researchers used miniature robots manufactured using 3-D printing methods for their experiment. The results have now been published in the renowned journal Nature Communications.

NASA Brings Universe of Discovery to USA Science and Engineering Festival

Step into the future of aviation and space exploration with NASA at the USA Science and Engineering Festival on Saturday, April 7, and Sunday, April 8, at the Walter E. Washington Convention Center in Washington.

NASA Brings Universe of Discovery to USA Science and Engineering Festival

Step into the future of aviation and space exploration with NASA at the USA Science and Engineering Festival on Saturday, April 7, and Sunday, April 8, at the Walter E. Washington Convention Center in Washington.

New metasurface model shows potential to control acoustic wave reflection

Typically, when a soundwave strikes a surface, it reflects back at the same fundamental frequency with a different amplitude. A new model shows that when a sound wave hits a nonlinear elastic metasurface, the incident fundamental frequency does not bounce back. Instead, the metasurface converts that energy into the wave's second harmonic resonance. Developing this metasurface could help architects reduce noise from performance halls to cityscapes.

High-speed and on-silicon-chip graphene blackbody emitters

High-speed light emitters integrated on silicon chips can enable novel architectures for silicon-based optoelectronics. However, compound-semiconductor-based light emitters face major challenges for their integration with a silicon-based platform because of their difficulty of direct fabrication on a silicon substrate. Here, high-speed, highly-integrated graphene-based on-silicon-chip blackbody emitters in the near-infrared (NIR) region including telecommunication wavelength were developed.

Scientists create 'Swiss army knife' for electron beams

Scientists have created a miniature particle accelerator for electrons that can perform four different functions at the push of a button. The experimental device is driven by a Terahertz radiation source and can accelerate, compress, focus and analyze electron bunches in a beam. Its active structures measure just a few millimeters across.

NASA Awards Contract to Build Quieter Supersonic Aircraft

NASA has taken another step toward re-introducing supersonic flight with the award Tuesday of a contract for the design, building and testing of a supersonic aircraft that reduces a sonic boom to a gentle thump.

New Research Heading to Space Station Aboard 14th SpaceX Resupply Mission

Astronauts aboard the International Space Station soon will receive a delivery of experiments dealing with how the human body, plants and materials behave in space following the 4:30 p.m. EDT launch Monday of a SpaceX commercial resupply mission.

From the Overview Effect to "One Strange Rock": A Conversation with Leland Melvin

It’s hard to think of any modern human activity that has had more of a multiplicative impact on the imagination than space exploration. To date, a grand total of 562 humans have left the Earth—a trivial fraction compared to the 7.6 billion people currently staying put. Yet the image of astronauts voyaging away from their home planet has transformed popular culture, education, even business and politics.

Former NASA astronaut Leland Melvin is a lead agent helping to advance that transformation

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