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      "body": "<html> <p>https://cdn.steemitimages.com/DQmQJXfk4tPh3sbiEgfa1Y4WvdyCwn8HJr9Z6KzaFahZ4H5/image.png</p> <p><br></p> <p>Researchers is taking solar sailing to the next level with advanced photonic materials. This new class of materials could be used to steer reflected or transmitted photons and enable near-Earth, interplanetary and interstellar space travel.</p> <p>Spacecraft outfitted with sails and propelled by the sun are no longer the stuff of science fiction or theoretical space missions. Now, a Rochester Institute of Technology researcher is taking solar sailing to the next level with advanced photonic materials.</p> <p><br></p> <p><strong>Metamaterials</strong> -- a new class of humanmade structures with unconventional properties -- could represent the next technological leap forward for solar sails, according to Grover Swartzlander, professor in RIT's Chester F. Carlson Center for Imaging Science. He proposes replacing reflective metallic sails with diffractive metafilm sails. The new materials could be used to steer reflected or transmitted photons for near-Earth, interplanetary and interstellar space travel.</p> <p>'Diffractive films may also be designed to replace heavy and failure-prone mechanical systems with lighter electro-optic controls having no moving parts,' he said.</p> <p>Swartzlander is leading an exploratory study supported by phase one funding from NASA's Innovative Advanced Concepts program. The nine-month, $125,000 award encourages development of visionary technology with potential to revolutionize future space exploration. The Optical Society is hosting an incubator meeting, Metamaterial Films for In-Space Propulsion by Radiation Pressure, Oct. 7-9 in Washington, D.C., to create a roadmap for advancing metamaterial sails on low Earth-orbiting satellites called CubeSats. Swartzlander will facilitate the meeting with co-organizers Les Johnson, manager of the In-Space Propulsion Technology Projects Office at NASA Marshall Space Flight and principal investigator of NASA Near-Earth Asteroid Scout mission, or NEA Scout; and Nelson Tabirian, president of BEAM Co., which specializes in optical technologies and materials.</p> <p>'CubeSats are becoming of great national importance for science, security and commercial purposes,' Swartzlander said. 'The potential to raise, de-orbit or station-keep hundreds of CubeSats from low Earth orbit would be a recognized game changer that would build enthusiasm and advocacy among the growing small-satellite community of students, entrepreneurs and aerospace scientists and engineers.'</p> <p>NEA Scout will be the first CubeSat science mission having attached sails. It is one of 13 satellites that will conduct science and technology investigations as part of NASA's Exploration Mission-1. EM-1 is slated to launch this year on the new Space Launch System rocket. When deployed, NEA Scout's aluminum coated polyimide sail will reflect sunlight to propel the reconnaissance robotic spacecraft on its two-year cruise.</p> <p>Swartzlander said diffractive metafilm sails could correct known limitations of reflective metallic sails -- overheating, inefficient use of photons and excessive tilt of the spacecraft -- because the new materials can:</p> <blockquote>Lower absorption: The proposed diffractive surfaces would eliminate problems inherent in the metallic-coatings, which heat and compromise sail substrates;</blockquote> <blockquote>Reuse of photons: Diffractive sails would recycle transmitted photons, converting them to solar-electric power or diffracting the light twice for added momentum. (Reflective sails reflect photons back into space or absorb in the metallic coating); and</blockquote> <blockquote>Improved orientation: Diffractive sails maintains a more efficient position facing the sun, allowing highly efficient propulsion and generation of solar electric power on embedded photovoltaic cells. (Reflective sails work best when the spacecraft is tilted. However, this orientation decreases the projection of solar power upon the sail.)</blockquote> <p>'Diffractive sails may also be designed for laser-based propulsion, a decades-old concept that has recently attracted significant interest from private investors, resulting in a program called Breakthrough Starshot,' Swartzlander said.</p>https://cdn.steemitimages.com/DQmeoHJYuAdpx39Axv4tT9kXHNYtfVBEPEfYgbPUa2mWA2j/image.png</html>",
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      "body": "<html> <p>https://cdn.steemitimages.com/DQmTNWS5eK8VzzJvxAFsZLcpTV8WWbeMfNFmMahaN1JXkmk/image.png<em>University of Calgary researchers have developed a brain imaging system that may one day be used in concussion treatment clinics and sports facilities to detect and monitor damage in the brain from concussion. From left: Ibukunoluwa Oni, graduate student with the Experimental Imaging Center; Carter Randall, undergraduate research assistant; and Jeff Dunn, Ph.D., director of the Experiment Imaging Centre at the Cumming School of Medicine.</em></p> <p><br></p> <p><strong>It's one of the most talked about injuries in sport today, concussion. Yet, there is no accepted way to image a concussion. University of Calgary scientist Jeff Dunn, PhD, hopes to change that. He and his team have developed a portable brain imaging system that uses light to detect and monitor damage in the brain from concussion. Researchers and doctors will be using the technology in an upcoming study at the Alberta Children's Hospital.</strong></p> <p><br></p> <p>The device, a Near-Infrared Spectroscopy (fNIRS), measures communication in the brain by measuring oxygen levels. When the brain is working well, major regions on each side of the brain are communicating and so have similar patterns of blood flow and oxygen levels in blood. Researchers measure the changes in blood oxygen levels as a marker of brain function. Results show these patterns change after concussion.</p> <p><br></p> <blockquote>The one thing we know is that there can be physiological changes in the brain that last for months to years after a brain injury due to concussion. We discovered a new technology that is portable to measure those changes,' says Dunn, director of the Experimental Imaging Centre at the Cumming School of Medicine (CSM). 'We will now apply this new technology to see how important these changes are, as we try to understand how concussion evolves over time.</blockquote> <p><br></p> <p>Dunn became interested in finding a way to image concussion after his children became involved in ski racing.</p> <blockquote>'A lot of kids on the ski hill were getting head hits and it was really very apparent that there wasn't an imaging method that could help them,' says Dunn who is also a member of the Hotchkiss Brain Institute and Alberta Children's Hospital Research Institute at the CSM. 'Currently, concussion is often measured by the symptoms someone experiences, but we really don't know what's happening in the brain in any one person.'</blockquote> <p><br></p> <p>Symptoms can vary greatly between individuals, and can include headaches, nausea, loss of memory and lack of coordination (to name a few), making it even more difficult to find treatment options for each person. Through his research, Dunn hopes the images will show a connection between symptoms and abnormalities in the brain that could help doctors identify treatment protocols and recovery timelines.</p> <p>In partnership with Alberta Health Services and with the support of the Canadian Institutes of Health Research, Dunn will be teaming up with physicians at the Alberta Children's Hospital, and other UCalgary researchers at the CSM and in the faculties of Kinesiology and Arts to use the imaging device to study concussion in children.</p> <p><br></p> <p>'We will be able to follow young patients over time to establish whether this new technology can help us determine the extent of the injury and how the brain is recovering,' says Dunn.</p> <p>Keith Yeates, PhD, lead for the university's Integrated Concussion Research Program (ICRP) and a co-investigator on the study, says the technology has important practical benefits, 'The fNIRS device has the potential to provide a convenient method for helping detect concussion.'</p> <p>To image the brain, the researchers place a cap, similar to a swim or bathing cap, on the top of the head. The cap contains small lights that have sensors connected to a computer. When researchers turn on the lights, they can monitor and measure brain activity. The device is non-invasive and portable.</p> <p>While most often associated with sports, concussion affects thousands of Canadians a year who experience a fall, or a car accident. While most people recover, some experience long-term effects and disabilities.</p> <p>A recent study, by Dunn and colleagues, showed promising results of the device's ability to detect changes in brain activity in adults with long-term symptoms post-concussion. The findings are published in the Journal of Neurotrauma. This research is still ongoing at the Foothills Medical Centre.</p> </html>",
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