Three technologies that fix themselves
Pressure Point: The polymer fibers in flexible concrete help it resist 500 times as much stress as conventional concrete. Courtesy Nicole Casal Moore/University of Michigan;
Flexcrete
Researchers have known for decades that concrete fixes itself as
cement particles near a small crack mix with air and water to form
calcium carbonate. But some fractures are too big to heal on their own.
Now engineers at the University of Michigan have mixed a new concrete
formula with reinforcing glue-like fibers that hold it together under
pressure, allowing only hair-width cracks that can mend after a rainy
day. Available in a few years, the remixed concrete will cost more than
the standard stuff, but less maintenance could make it cheaper in the
long run.
Scratch-Be-Gone
Body Work: Sunlight will heal scrapes like these. Frank Cezus/Getty Images
It’s
Murphy’s law: Park a new car at the store, and a shopping cart will
scratch it. Soon, however, a sunny hour-long drive will allow the paint
to repair itself. Scientists at the University of Southern Mississippi
used chemicals found in crab shells to make a polyurethane paint that
reconnects molecular bonds under ultraviolet light, even
down-to-the-metal scrapes that current resin-based healing paints can’t
handle. The new paint could be ready for automakers in two years.
Digital Detour
Good as New: Chips will soon work around dead transistors. iStock
All
it takes is one burned-out transistor in a microprocessor to kill a
computer. Now, engineers at the California Institute of Technology have
built a chip with sensors that measure power levels in a circuit. When
the chip detects a faulty transistor, actuators redirect the current
around the bad one, in a thousandth of a second. The group expects to
scale up its 10-actuator prototype into a full-size chip, with 1,000
actuators, in three years.
Precision Nanoscale Car Parts Self-Assembled From DNA
Scientists program DNA to fold in tightly controlled curves and
circles—an important step toward building larger nanomachines.
Nano Origami courtesy Hendrik Dietz
In the macro world, the construction shapes
available to us are numerous, and the tools to build them are
straightforward. But nanoarchitecture has always been much more limited
-- first to two dimensions, then to only certain kinds of
three-dimensional shapes. This week, scientists have broadened the
possibilities for nano-building, programming DNA to bend itself into
complicated custom curves. The researchers revealed their creations in
the current issue of Science: a group of tight little gears, tubes, and a wireframe ball.
Microbial Fuel Cell Cleans Wastewater, Desalinates Seawater, and Generates Power
Not bad for a microbe
Microbial fuel cell desalinates water while generating electricity: This microbial fuel cell not only cleans wastewater while generating electricity, but also desalinates seawater. Dave Jones, Penn State
Desalinization technology has long been trapped
between two competing nightmare scenarios. Without desalination, fresh
water resources run out and large swaths of the earth suffer crippling
water shortages. But if we desalinate on a large scale, we keep burning
fossil fuels, the earth warms, the ice caps melt, and sea levels rise
to wreak havoc on coastal regions.
The Future of Farming: Eight Solutions For a Hungry World
The challenge of growing twice as much food by 2050 to feed nine
billion people—with less and less land—is everyone’s problem. But
scientists are hard at work fomenting a second green revolution.
By Hilary Rosner Posted 08.07.2009 at 11:45 am
Desert Oasis: The Sahara Forest Project will use concentrating solar power to provide energy to greenhouses in the desert. Paul Wootton
Today’s crops crisscross the globe: Mexico’s
tomatoes end up on your plate, our wheat heads to Africa. As a result,
the challenge of growing twice as much food by 2050 to feed nine
billion people—with less and less land—is everyone’s problem. But
scientists are hard at work fomenting a second green revolution. Here’s
how nitrogen-spewing microbes, underground soil sensors and
fruit-picking robots will help keep food on our tables.
1. Farm the Desert
70%: Amount of the world’s freshwater used for agriculture
Solution Greenhouses built near coasts turn plentiful seawater into freshwater for crops, without expensive desalinization plants.
Potential Farmers could grow cash crops like lettuce and tomatoes in the desert.
ETA Three pilot projects are under way, and researchers are scouting sites for a larger full-scale project.
Can This Chinese Farmer's DIY Helicopter Really Fly?
Reportedly, the wooden copter can soar up to 2,600 feet, but the Chinese government has grounded it for safety reasons
That's One Crazy Copter: A farmer cares to bet his life on his DIY copter, but the Chinese government says no. DVICE
Anyone who dares to build a helicopter with wooden blades, a
steel-pipe-reinforced frame, and a motorcycle engine deserves to go up
in the thing. But the Chinese government has forbidden farmer Wu
Zhongyuan from even attempting a test flight. We just want to see if
the crazy contraption can fly.
SeaDoo's 255-Horsepower RXT iS: The World's Most Advanced Jet Ski Tried to Rip My Face Off
As you can see from our on-board camera, going 70mph on a jet ski is,
well, scary. Thankfully, the RXT is the first personal watercraft with
a brake
Sea-Doo RXT iS: John Mahoney
It's not every day you get to saddle up on a $15,000 watercraft with 255 horses, a top speed of 70+ mph
and
the world's first braking system for jet skis. It's also not every day
you get to point said beast into a 30mph wind and floor it, doing zero
to sixty faster than an Italian supercar while said wind has its way
with your face.
This is, for the most part, what it looks like, thanks to a GoPro
Hero Wide camera mounted on the hull by our buddy Joel Johnson: