Wenn Flugzeuge fliegen, entstehen hinter ihnen Luftverwirbelungen, so genannte Wirbelschleppen. Diese können Auswirkungen auf den nachfolgenden Flugverkehr haben. Das Deutsche Zentrum für Luft- und Raumfahrt (DLR) erprobt nun in Flugversuchen ein Wirbelschleppenwarnsystem mit den Forschungsflugzeugen ATRA und Falcon. Das System kann die potentiell gefährlichen Wirbelschleppen allein aus den Positionsdaten- und Wetterinformationen des vorausfliegenden Flugzeugs vorhersagen. (more…)
A Yale-led research team has developed a new approach to species conservation that prioritizes genetic and geographic rarity and applies it to all 9,993 known bird species.
“To date, conservation has emphasized the number of species, treating all species as equal,” said Walter Jetz, the Yale evolutionary biologist who is lead author of a paper published April 10 in Current Biology. “But not all species are equal in their genetic or geographic rarity. We provide a framework for how such species information could be used for prioritizing conservation.” (more…)
A team of about 20 working at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., through the lab’s Phaeton early-career-hire program, led the development of the Optical Payload for Lasercomm Science (OPALS) investigation, which is preparing for an April 14 launch to the International Space Stationaboard the SpaceX-3 mission. The goal? NASA’s first optical communication experiment on the orbital laboratory.
Scientific instruments used in space missions increasingly require higher communication rates to transmit gathered data back to Earth or to support high-data-rate applications, like high-definition video streams. Optical communications-also referred to as “lasercom”-is an emerging technology where data is sent via laser beams. This offers the promise of much higher data rates than what is achievable with current radio frequency (RF) transmissions and has the advantage that it operates in a frequency band that is currently unregulated by the Federal Communications Commission. (more…)
The eternal ebb and flow of tides — 24 x 7 x 365 — makes them a dependable source of energy, but how to harness all that, especially in shallow water? Shreyas Mandre and colleagues at Brown have developed an efficient water wing and optimized its performance with a “secret sauce.”
PROVIDENCE, R.I. [Brown University] — When it comes to raw power and absolute reliability, it doesn’t get much better than the tides. That’s why tidal power is such an attractive option as a renewable form of energy. But designing a device to gather tidal energy in shallow water, where the ebb and flow move fastest and the energy potential is highest, has proven problematic. (more…)
Researchers from North Carolina State University have demonstrated that vertically aligned carbon nanofibers (VACNFs) can be manufactured using ambient air, making the manufacturing process safer and less expensive. VACNFs hold promise for use in gene-delivery tools, sensors, batteries and other technologies.
Conventional techniques for creating VACNFs rely on the use of ammonia gas, which is toxic. And while ammonia gas is not expensive, it’s not free. (more…)
A fossil creature buried in an “invertebrate version of Pompeii” more than half a billion years ago reveals the first-known cardiovascular system in exquisitely preserved detail.
An international team of researchers from the University of Arizona, China and the United Kingdom has discovered the earliest known cardiovascular system, and the first to clearly show a sophisticated system complete with heart and blood vessels, in fossilized remains of an extinct marine creature that lived over half a billion years ago. The finding sheds new light on the evolution of body organization in the animal kingdom and shows that even the earliest creatures had internal organizational systems that strongly resemble those found in their modern descendants. (more…)
Researchers from Princeton University and the Swiss Federal Institute of Techonology in Zurich have confirmed that during the last ice age iron fertilization caused plankton to thrive in a region of the Southern Ocean.(more…)
Einmal mit der Kraft der Sonne um die Erde fliegen und dabei Kontinente und Ozeane überwinden. Diesem bisher unerreichten Ziel stellt sich das Projekt SolarImpulse. Mit einem extrem leichten Flugzeug bedeckt von Solarzellen und angetrieben von vier Elektropropellern soll dieses fliegerische Wagnis 2015 gelingen. Das Deutsche Zentrum für Luft- und Raumfahrt (DLR) hat in einem rund zweiwöchigen Standschwingungsversuch bis Anfang April das Strukturverhalten des Leichtbaufliegers untersucht. Damit erhalten die Solarflugpioniere aus der Schweiz wertvolle Informationen über das zukünftige Flugverhalten ihres Prototyps. Ein wichtiger Schritt für den Flug um die Welt. (more…)
