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5 December 2013 11:26 am ,
Vol. 342 ,
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
Since arriving on the island of Guam in the 1940s, the brown tree snake ( Boiga irregularis ) has extirpated native...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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ScienceShot: Concrete + Diamonds = Quieter Roads
21 April 2010 2:54 pm
Want to reduce highway noise without retrofitting every vehicle with a quieter engine and tires? Grind the concrete with diamonds. That's what engineers have concluded after studying hundreds of highway surfaces across the United States, Canada, and Europe over the past 5 years. They found that by shaving off the peaks and irregularities that dot the surface of concrete pavement (top images) with a machine that is essentially a large drum encrusted with diamond dust, workers can reduce road noise by as much as 10 decibels—or nearly half. The technique can be applied to any concrete, no matter how fresh or hardened, pavement engineer Robert Otto Rasmussen of the Transtec Group in Austin, Texas, told attendees at a meeting of the Acoustical Society of America in Baltimore, Maryland, this week. So, he says, it "allows you to restore a quiet ride on virtually any roadway."