Los Angeles is a car town, so it's controversial to promote "road diets," a form of roadway reconfiguration intended to slow cars and reduce collisions, especially with cyclists and pedestrians. Scientists reviewed data from one controversial road diet and found that crashes were cut in half, and unsafe speed crashes dropped to zero.
I've been writing "design fiction" for years (see, for example, Knights of the Rainbow Table), and when people ask me to explain it, I say something like, "An engineer might make a prototype to give you a sense of how something works; an architect will do a fly-through to give you a sense of its spatial properties; fiction writers produce design fiction to give you a sense of how a technology might feel." Read the rest
The device consists of a temporary tattoo—which sticks to the skin, induces sweat and electrochemically detects the alcohol level—and a portable flexible electronic circuit board, which is connected to the tattoo by a magnet and can communicate the information to a mobile device via Bluetooth.
The device could be integrated with a car’s alcohol ignition interlocks, or friends could use it to check up on each other before handing over the car keys, he added.
“When you’re out at a party or at a bar, this sensor could send alerts to your phone to let you know how much you’ve been drinking,” said Jayoung Kim, a materials science and engineering PhD student.
UC Berkeley researchers are developing "Neural Dust," tiny wireless sensors for implanting in the brain, muscles, and intestines that could someday be used to control prosthetics or a "electroceuticals" to treat epilepsy or fire up the immune system. So far, they've tested a 3 millimeter long version of the device in rats.
“I think the long-term prospects for neural dust are not only within nerves and the brain, but much broader,“ says researcher Michel Maharbiz. “Having access to in-body telemetry has never been possible because there has been no way to put something supertiny superdeep. But now I can take a speck of nothing and park it next to a nerve or organ, your GI tract or a muscle, and read out the data."
Maharbiz, neuroengineer Jose Carmena, and their colleagues published their latest results on "Wireless Recording in the Peripheral Nervous System with Ultrasonic Neural Dust" in the journal Neuron.
From UC Berkeley:
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While the experiments so far have involved the peripheral nervous system and muscles, the neural dust motes could work equally well in the central nervous system and brain to control prosthetics, the researchers say. Today’s implantable electrodes degrade within 1 to 2 years, and all connect to wires that pass through holes in the skull. Wireless sensors – dozens to a hundred – could be sealed in, avoiding infection and unwanted movement of the electrodes.
“The original goal of the neural dust project was to imagine the next generation of brain-machine interfaces, and to make it a viable clinical technology,” said neuroscience graduate student Ryan Neely.
This well-made video from Practical Engineering explains why soil is not a good building material, and then shows how to mechanically stabilize it so it can bear weight.
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Dirt is probably the cheapest and simplest construction material out there, but it's not very strong compared to other choices. Luckily geotechnical engineers have developed a way to strengthen earthen materials with almost no additional effort - Mechanically Stabilized Earth (aka MSE or Reinforced Soil). If you look closely, you'll see MSE walls are everywhere. Thanks for watching, and let me know what you think!
As high rises replace their elevator up/down buttons with panels that you enter a floor into, which then direct you to a specific elevator, they create the possibility of adding more cars to each shaft, radically increasing the efficiency and throughput of a building's lifts. Read the rest
University of Cambridge researchers have built the world's smallest working engine. The device, powered by light, could be the basis of future nanoscale machines that are just billionths of a meter in size. Fantastic Voyage, here we come! From the University of Cambridge:
The prototype device is made of tiny charged particles of gold, bound together with temperature-responsive polymers in the form of a gel. When the ‘nano-engine’ is heated to a certain temperature with a laser, it stores large amounts of elastic energy in a fraction of a second, as the polymer coatings expel all the water from the gel and collapse. This has the effect of forcing the gold nanoparticles to bind together into tight clusters. But when the device is cooled, the polymers take on water and expand, and the gold nanoparticles are strongly and quickly pushed apart, like a spring. The results are reported in the journal PNAS.
“It’s like an explosion,” said Dr Tao Ding from Cambridge’s Cavendish Laboratory, and the paper’s first author. “We have hundreds of gold balls flying apart in a millionth of a second when water molecules inflate the polymers around them.”
“We know that light can heat up water to power steam engines,” said study co-author Dr Ventsislav Valev, now based at the University of Bath. “But now we can use light to power a piston engine at the nanoscale.”