Just A Reminder That I Do Have An Etsy Store With Legacy Of Kain Neckwarmers And Badges, Dragon Age Neckwarmers

Breakfast far above the clouds, Pokut, Turkey

are you good sir

Alan Turing: A Tribute

See more images at: http://futurism.com/images/

http://futurism.com/images/turing/

Wow

After presenting the oldest known proof of the Pythagorean Theorem from the Zhou Bi Suan Jing (Chinese math book from like 1000-600BC), Bhaskara (Hindu mathematician who presented the proof, but did not discover it) ended his explanation with “Behold”.

In other news, instead of a black square, my proofs will now end with Behold.

Ticks in amber that fed on dino blood

The 99 million year old fossilised tree sap from Burma has brought us several significant finds of late including a baby bird (see http://bit.ly/2C8DsW1) and some early avian wings (see http://bit.ly/2hpvCQK). Now some preserved remnants from a feathered dinosaur nest has revealed several parasitic ticks (a type of arachnid, related so spiders and scorpions) alongside a dinosaur feather (one clinging to it for dear life) and nest dwelling beetles, and several other fossilised ticks have appeared in material from the same location. The feather clinger was seemingly filled with dinosaur blood and swollen to 8 times its normal size after its final and fatal feast (named by the team Deinocroton draculi aka Dracula’s terrible tick). For those fans of Jurassic Park amongst our readers, I’ll just remind you of the unfortunate scientific fact that DNA simply does not survive that long except in the tiniest and hard to read dribs and drabs (at the very best, and even these prove highly contentious).

Continuar lendo

Kelston Boys’ High School perform a massive haka in honour of the new Maori carving on campus

Here is a semester project in the 2012 Mechatronic control systems engineering module at San Jose State University. This is a Proportional-Integral-Derivative controlled (PID), 6 degree of freedom (6-DOF) Stewart platform, which basically means it has six axes on the top plate. This prototype uses 6 radio controlled servo motors instead of the traditional use of hydraulic jacks or electronic actuators. (this video has sound)

Proportional-Integral-Derivative:

A PID controller continuously calculates an error value as the difference between a measured process variable and a desired setpoint. The controller attempts to minimize the error over time by adjustment of a control variable, such as the position of a set of servo motors or actuators,  to a new value, given by a weighted sum:

where Kp ,Ki , and Kd, all non-negative, denote the coefficients for the proportional, integral, and derivative terms, respectively (sometimes denoted P, I, and D).

P accounts for present values of the error , and is determined by the direction and magnitude the correction needs to be applied (e.g. if the error is large and positive, the control variable will be large and negative),

I accounts for past values of the error (e.g. if the output is not sufficient to reduce the size of the error, the control variable will accumulate over time, causing the controller to apply a stronger action through P), and

D accounts for possible future values of the error, based on its current rate of change. This part determines when and at what rate it needs to reduce the magnitude of its action, e.g as the ball fast approaches the desired set point at the centre of the plate.

[source]

Cute animals ♥

Panda tree!