Tuesday, April 20

Science

Robots learn to get back up after a fall in an unfamiliar environment
Science

Robots learn to get back up after a fall in an unfamiliar environment

Robots learn to get back up after a fall in an unfamiliar environment By Karina Shah Robots can pick themselves up after a fall, even in an unfamiliar environment, thanks to an artificially intelligent controller that can adapt to new scenarios. It could make four-legged robots more useful in responding to natural disasters, such as earthquakes. Zhibin (Alex) Li at the University of Edinburgh, UK and his colleagues used an AI technique called deep reinforcement learning to teach four-legged robots a set of basic skills, such as trotting, steering and fall recovery. This involves the robots experimenting with different ways of moving and being rewarded with a numerical score for achieving a certain goal, such as standing up after a fall, and p...
Engineering magnetics — practical introduction to BH curve
Science

Engineering magnetics — practical introduction to BH curve

Engineering magnetics -- practical introduction to BH curve A practical introduction to understanding magnetic devices such as transformers and motors. This video covers BH curves, reluctance, permeability, DC and AC magnetic circuits, and some applications. CORRECTION: at 13:48, I say that permeability can be negative. This is not true. All permeabilities are positive. Diamagnetic materials have permeabilities that are lower than empty space (eg .95 relative permeability). There is another quantity which is called susceptibility, which describes the ratio between flux carried by a material, and the flux carried by the space which the material occupies. This quantity can be negative. Please put questions in the comments, and I'll do my best to answer them...
First ever quantum chess tournament won by Amazon researcher
Science

First ever quantum chess tournament won by Amazon researcher

First ever quantum chess tournament won by Amazon researcher By Leah Crane In quantum chess, a piece can be in more than one place at oncelucadp/Getty Images The world’s first quantum chess tournament took place during the virtual Q2B conference, and a player from Amazon beat out representatives of five other companies involved in quantum computing to claim the title. Quantum chess, developed by Chris Cantwell at Quantum Realm Games in California, is a strange version of the familiar game of chess. The rules incorporate several ideas from quantum mechanics. Pieces can be placed into a superposition of two locations, meaning that a piece can occupy more than one square … Published at Thu, 10 Dec 2020...
Magnetic Accelerators | Magnetic Games
Science

Magnetic Accelerators | Magnetic Games

Magnetic Accelerators | Magnetic Games These magnetic accelerators ,made with neodymium magnets, are really very powerful, the ball magnet has a high acceleration. On a larger scale they could become a weapon. Here the magnets used for those accelerators, thanks to supermagnete.com for providing these magnets for free: The first 2 magnetic ramps Sphere K-19-C https://sumag.net/k-19-c-x01 Cubes W-10-N https://sumag.net/w-10-n-x01 W-12-N https://sumag.net/w-12-n-x01 Disks S-20-10-N https://sumag.net/s-20-10-n S-30-15-N https://sumag.net/s-30-15-n-x01 V-GATE accelerator Sphere K-26-C https://sumag.net/k-26-c-x01 Disk S-30-07-N https://sumag.net/s-30-07-n-x01 Last magnet ramp Block magnets Q-40-18-05-N...