Temperatures soar to beyond 1,000C in the turbine sections of helicopter engines. This is hardly a hospitable environment for a condenser microphone.
But Berlin-based German Aerospace Center (DLR) researchers, because they needed to take sound measurements in just such inhospitable places for experiments useful in the decades-long pursuit of quieter helicopters, have designed a special housing and coiled sound canal probe for the job.
A Stuttgart, Germany-based research team working on building artificial blood vessels with 3-D printers recently took another step forward by developing gelatin “bio-inks” that can be sprayed through inkjet nozzles without clogging them.
An Asian shipping company looking to boost its antipiracy defenses started the year by becoming the latest client of the LRAD Corp. of San Diego, maker of long-range acoustic hailing devices that can rumble sound over water for more than a mile and cause hearing damage from 50 ft. away.
LRAD stands for long-range acoustic device, the general term for the acoustic systems the company makes.
BERLIN — Researchers at more than half a dozen European space institutes are working to build better tools to forecast the space weather patterns produced by the Earth’s Sun.
Space weather events such as solar flares and coronal mass ejections (CMEs) create streams of energetic particles that can adversely affect astronaut health, satellite operations and terrestrial power grids.
BERLIN – German researchers are pleased so far with the results of their summer launch of a rocket-boosted hypersonic demonstrator, which reached 11 times the speed of sound, even though it is now clear they will not be able to recover the vehicle payload from its resting place at the bottom of the Greenland Sea.
The Michigan lab that introduced the notion of beetle-generated power for remote-controlled, insect-borne reconnaissance sensors is back—this time with an idea to generate energy from low-frequency ambient sound.
BERLIN — A Michigan lab is exploring an idea for generating energy from low-frequency ambient sound using tiny ceramic piezoelectric generators — a concept of interest to military planners looking for ever-smaller, cheaper and more durable power sources for sensors.
Researchers at the University of Michigan Center for Wireless Integrated Microsystems plan to publish a scheme for a low-frequency-powered ceramic piezoelectric generator in an upcoming issue of the Journal of Microelectromechanical Systems.
A Michigan lab is exploring an idea for generating energy from low-frequency ambient sound using tiny ceramic piezoelectric generators -- a concept of interest to military planners looking for ever-smaller, cheaper and more durable power sources for sensors.
The general feeling among many of China’s naval neighbors and in U.S. military circles is that China has been turning into a bit of a bully in (re)staking territorial claims in the seas off its coasts....More
Former Editor-in-Chief Dave North wrote pilot reports on more than 120 aircraft during his career at Aviation Week. His visits to Embraer began in 1978, long before the Brazilian company’s privatization and emergence as a powerhouse in regional jets. Here, he recalls his Embraer experiences, culminating in a test flight of the E170....More