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

Extremely Rare Fossil Turtle - Green River Formation, Rocky Mountains, USA

Fossil turtles from the Green River Formation are extremely rare. This is a well preserved, fifty million-year-old Trionyx softshell turtle in limestone. It was found in the upper layers of the F-1 Green River Formation. The stone also contains 9 small Knightia eocaena and a small Diplomystus dentatus.

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]

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douggsbase This was the 4th big way I have organised at Kjerag, Norway and the local record of 26 jumpers. The last record held here was a 24 way back in 1999. It went incredibly well. Text book in fact! And for most people this was their first big way. 20 jumpers were from @learntobasejump#LTBJA huge thanks to everyone for doing their jobs. I am very proud of all of you!! Big thanks to @sophiimeredithfor the great video angle 🎥

Some sceneries and living spaces.

I wanted to get some ideas/feelings out of head and to try out some new techniques.

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