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Search results for “Aeronautics”

634 results for "Aeronautics"

Figuring out flow dynamics

Researchers at Caltech have developed a new way to analyze turbulent flow near walls, which can help reduce drag and fuel consumption in aircraft and ships. By breaking down complex equations into smaller blocks, they found that commonly observed features of wall turbulence can be explained by superposing just three response modes.

SourceCalifornia Institute of Technology·JournalJournal of Fluid Mechanics·DateJul 31, 2013

Removing orbital debris with less risk

The study compares in-orbit debris removal options, considering their potential risk of creating new debris or disabling working satellites. Inflatable drag enhancement devices are found to have the lowest risk, while electromagnetic tethers pose a high risk for disabling operational satellites.

SourceGlobal Aerospace Corporation·JournalJournal of Spacecraft and Rockets·DateMar 22, 2013

Hovering is a bother for bees: Fast flight is more stable

New research published in the Journal of Theoretical Biology found that bumblebees are unstable when hovering and flying slowly, but become neutral or weakly stable at medium and high flight speeds. This is due to a sideways wind made by the movement of their wings, which can be reduced by increasing speed.

SourceElsevier·JournalJournal of Theoretical Biology·DateMar 14, 2013

Clearest evidence yet of polar ice losses

An international team of satellite experts has produced the most accurate assessment of ice losses from Antarctica and Greenland to date, confirming both regions are losing ice. The study reveals that melting of the Antarctic and Greenland ice sheets has contributed significantly to global sea level rise over the past two decades.

SourceUniversity of Leeds·JournalScience·DateNov 29, 2012

Improving 3-D image capture in real time

A team of researchers from the Public University of Navarre has developed a new algorithm for improving the real-time capture of 3-D images, enabling applications in fields like 3-D video recording and intelligent systems. The technique uses stereoscopic vision to compare pairs of images and yields better results than previous algorithms.

SourceElhuyar Fundazioa·JournalIEEE Transactions on Pattern Analysis and Machine Intelligence·DateNov 23, 2012

Sound bullets in water

Scientists develop a device that can form and control sound bullets in water, with potential uses for underwater imaging and biomedical applications. The device, inspired by Newton's cradle, focuses high-amplitude pressure pulses into compact sound bullets that can be tightly focused on a target area.

Plants in space!

Researchers at Michigan State University are studying plant adaptation to space stress using Arabidopsis mutants without functional IRE1 pathways. The goal is to gain insight into gene regulation and develop protocols for managing stress levels in space.

Study shows how to keep a Mars tumbleweed rover moving on rocky terrain

Researchers at North Carolina State University have developed a computer model to determine how a wind-driven 'tumbleweed' Mars rover would perform on rocky Martian terrain. The study found that larger diameter and lower weight rovers achieve better performance, with a minimum diameter of six meters needed for acceptable movement.

SourceNorth Carolina State University·JournalJournal of Spacecraft and Rockets·DateMay 23, 2012

Plasmas torn apart

Researchers Auna Moser and Paul Bellan observed a surprising phenomenon in lab experiments that provides clues to the origin of solar flares. The discovery reveals a connection between kink instability and Rayleigh-Taylor instability, which are two distinct phenomena occurring at different scales.

Wind-turbine placement produces tenfold power increase, Caltech researchers say

Researchers at California Institute of Technology have discovered that optimizing wind turbine placement on a given plot of land can increase power output by an order of magnitude. By positioning turbines in close proximity and using vertical-axis wind turbines, the team found that energy loss due to aerodynamic interference between ne...

SourceCalifornia Institute of Technology·JournalJournal of Renewable and Sustainable Energy·DateJul 13, 2011

Safer skies

A new algorithm using GPS data from a tracking system can predict and prevent collisions between small aircraft. Researchers at MIT have developed the algorithm to address the challenge of false alarms while allowing for some error margin.

MIT Study: conventional fossil fuels sometimes 'greener' than biofuels

A new MIT study highlights the variability in greenhouse gas emissions from alternative fuels, suggesting that conventional fossil fuels may sometimes be a more environmentally friendly choice. The research found that different types of land used for biofuel production can result in varying levels of carbon dioxide emissions, with some...

SourceMassachusetts Institute of Technology·JournalEnvironmental Science & Technology·DateMay 11, 2011