My professional blog with thoughts about microcontrollers, computer programming, and machine control.

 

peashooter85:

Bizarre and unusual Bayle double action pistol.  Originates from France, mid to late 19th century.

(Source: rockislandauction.com)

Advanced Concrete Means Little Maintenance For A Century

txchnologist:

image

by Michael Keller

A new water-repellant concrete impregnated with tiny superstrong fibers promises to leave roads and bridges free of major cracks for up to 120 years.

University of Wisconsin-Milwaukee civil engineers have developed a concrete mix that is durable and superhydrophobic. They call it Superhydrophobic Engineered Cementitious Composite (SECC). Preventing normally porous concrete from absorbing water means that liquid can’t get inside, freeze and cause it to crack. The concrete’s unusual characteristics, including being significantly more ductile than traditional concrete, means that cracks that do form do not propagate and cause failure.

“Our architecture allows the material to withstand four times the compression with 200 times the ductility of traditional concrete,” said associate professor Konstantin Sobolev, whose lab created SECC.

Read More

rtamerica:

First synthetic biological leaf could allow humans to colonize space
In order for humans to live in outer space, they must have a steady supply of oxygen they can depend on. Now, instead of relying on plants that may not survive, they can use an artificial biological leaf designed by a London graduate student.
Julian Melchiorri, a graduate student in innovation design engineering at the UK’s Royal College of Art, created the synthetic leaf, which he called the ‘Silk Leaf Project’. The design was for an RCA course offered in collaboration with Tufts University’s silk lab in Massachusetts.
Like the leaf from a real plant, the synthetic leaf uses photosynthesis to produce oxygen, by absorbing light, water and carbon dioxide. “The artificial leaves feature chloroplasts extracted from actual plant cells that are suspended in a material made from silk protein. So when given access to light and water they still produce oxygen, but they’re better suited to surviving off our planet,”Gizmodo reported.

rtamerica:

First synthetic biological leaf could allow humans to colonize space

In order for humans to live in outer space, they must have a steady supply of oxygen they can depend on. Now, instead of relying on plants that may not survive, they can use an artificial biological leaf designed by a London graduate student.

Julian Melchiorri, a graduate student in innovation design engineering at the UK’s Royal College of Art, created the synthetic leaf, which he called the ‘Silk Leaf Project’. The design was for an RCA course offered in collaboration with Tufts University’s silk lab in Massachusetts.

Like the leaf from a real plant, the synthetic leaf uses photosynthesis to produce oxygen, by absorbing light, water and carbon dioxide. “The artificial leaves feature chloroplasts extracted from actual plant cells that are suspended in a material made from silk protein. So when given access to light and water they still produce oxygen, but they’re better suited to surviving off our planet,”Gizmodo reported.

trigonometry-is-my-bitch:

How a hole is drilled to be made square. The red shape in the center would be the cutting tool.
it shares the same principle as a Reuleaux triangle but with one rounded corner so that the cut square does not have rounded edges; the cutting tool follows the path of the rounded edge that is tangent to the sides of the outer square. because a tangent line is perpendicular to the radius, as the cutting tool follows the path of the rounded edge it turns precisely 90° to create a sharp edged perfect square.

trigonometry-is-my-bitch:

How a hole is drilled to be made square. The red shape in the center would be the cutting tool.

it shares the same principle as a Reuleaux triangle but with one rounded corner so that the cut square does not have rounded edges; the cutting tool follows the path of the rounded edge that is tangent to the sides of the outer square. because a tangent line is perpendicular to the radius, as the cutting tool follows the path of the rounded edge it turns precisely 90° to create a sharp edged perfect square.

techhive:

Chat off the grid: goTenna lets you send texts without cellular service
Towers schmowers! This portable RF antenna lets your phone work like a walkie-talkie, sending messages and GPS coordinates with no cellular connection required.

Let this be noted as the first steps to a second internet, a system independent of government/corporation.  A net of people, uncontrolled, private, and free.  A background app could act as a repeater to selectively forward messages similar to the way TCP/IP works for the internet, inside switches and routers.  With enough users and available frequencies, this gizmo could make for some huge changes.
To those with the technical know-how, run with it.

techhive:

Chat off the grid: goTenna lets you send texts without cellular service

Towers schmowers! This portable RF antenna lets your phone work like a walkie-talkie, sending messages and GPS coordinates with no cellular connection required.

Let this be noted as the first steps to a second internet, a system independent of government/corporation.  A net of people, uncontrolled, private, and free.  A background app could act as a repeater to selectively forward messages similar to the way TCP/IP works for the internet, inside switches and routers.  With enough users and available frequencies, this gizmo could make for some huge changes.

To those with the technical know-how, run with it.

cnce:

ABB Robotics - Introducing a new era of robotics

fuckyeahfluiddynamics:

Paint is probably the Internet’s second favorite non-Newtonian fluid to vibrate on a speaker—after oobleck, of course. And the Slow Mo Guys' take on it does not disappoint: it's bursting (literally?) with great fluid dynamics. It all starts at 1:53 when the less dense green paint starts dimpling due to the Faraday instability. Notice how the dimples and jets of fluid are all roughly equally spaced. When the vibration surpasses the green paint’s critical amplitude, jets sprout all over, ejecting droplets as they bounce. At 3:15, watch as a tiny yellow jet collapses into a cavity before the cavity’s collapse and the vibration combine to propel a jet much further outward. The macro shots are brilliant as well; watch for ligaments of paint breaking into droplets due to the surface-tension-driven Plateau-Rayleigh instability. (Video credit: The Slow Mo Guys)

reginageorqee:

Aerogel, also know as frozen smoke, is the world’s lowest density solid, clocking in at 96% air. If you hold a small piece in your hand, it’s practically impossible to either see or feel, but if you poke it, it’s like styrofoam. It supports up to 4,000 times its own weight and can withstand a direct blast from two pounds of dynamite. It’s also the best insulator in existence. Pretty amazing

reginageorqee:

Aerogel, also know as frozen smoke, is the world’s lowest density solid, clocking in at 96% air. If you hold a small piece in your hand, it’s practically impossible to either see or feel, but if you poke it, it’s like styrofoam. It supports up to 4,000 times its own weight and can withstand a direct blast from two pounds of dynamite. It’s also the best insulator in existence. Pretty amazing

(Source: fridaie)