Monday, December 8, 2014

Nice video on the E-ELT

Recently declassified interview

Recently, we had an exclusive opportunity to chat with ████ ████████ of the █████ ██████ ███████. Our interview will bring you an amazing and previously-unseen insight into the world of █████████████.
A5: Thanks for joining us today, █████ to talk about the ████████████ and your experiences with the ████████████████████████. We appreciate you taking the time for this!
 ████ ████████: No problem! Glad to be here!
A5: Let’s get down to business. The ██████ ██ ████████████ ████████ ████████████████, correct? How do you ████████████████████████?
████ ████████: That’s a great question. Well, ████████ ████ ██████████████ ██████ ██ ██████████ ██████████  ████████ █████████████ ████████████████  ███████████████ ███████████ ██████████ ███████████ ████████████ ████ ████ monkeys ████████. ██████ ████████████ ████████ ██████████ ███████████ █████████ ████████████ ice cream. However, when you ██████████████ ████████ ████ ██████ ██████████ ██████ ████████████ ████ █████████████████ ███████ ██████████████ ████████ ██████████ █████████ ███████ ████████████ Prius.
A5: That’s amazing! And these very ██████████████ above us?!
████ ████████: Not just that, █████████████ ███████ ████████████, █████████ ███████? ██████ ██████████! ██████████ ███████████ ████████ ████████ ███████ █████ ███████ ██████ ██… Crazy, isn’t it?
A5: So does ████ █████████████ ███?
████ ████████: ██████ ██████████████ ████████!
A5: What about ████████████? Is that real?
████ ████████: ██████████████! The heads up display ████████ ██████████████ ████████████!
A5: And how did they manage that?
████ ████████: Well, ██████████████████. ██████ ████ ████████████████ ancient aliens. ████████ ██████████████ ██████████ ██████ ██████████ ██████ ███████ ████████ █████ ████████ ██████████████ ███████████ █████████ ██████ ███████████████ ██████████████ ███████████████████ ████████████ ███████████ ███████ █████████ ████ █████████████ ███████ █████ ████████ ██████████████ ██████████████████ █████████ █████████████ ████████ Roswell ██████████████ ██████████ ██████████ Doritos.

Saturday, December 6, 2014

Ice Skating On A Crystal Clear Lake In Sweden


"This whole skating season's been incredible. I've been out for nine days in a row. We went through 11 lakes and rivers one day. We only needed to walk 1.2 km of the stretch of four mil, the rest went to go on fine ice. "
Jonas Landmark

Friday, December 5, 2014

NASA live video feed of Orion test launch...



... Fails at T-10 seconds and freezes while buffering! All I get is a few frames like this mid launch. Maybe with a few billion dollars more they will master late 1990's video streaming technology.

Simulating fluids



"Vortices created by the imbalance of a centrifugal force and a radial pressure gradient in a curved pipe move fluid from the inner wall (left side) towards the outer wall. These so called 'Dean vortices' (referring to the two symmetric structures in the rightmost figure) are common features of flows in curved geometries and occur in nature, such as in rivers, and technical applications, such as in heat exchangers and piping systems, where they are sometimes specifically generated for particle separation or filtration purposes.

By measuring the speed of tracer particles it is possible to obtain snapshots of the three dimensional velocity field in a cross plane and thereby capture the unsteady behavior of the vortices under turbulent flow conditions. Surrounded by an irregular and chaotic environment, the couple of 'undetermined' vortices appears to 'dance.' Sometimes they dance together while at other times one of them is taking the lead by swinging its partner (referring to the three snapshots to the left). Nonetheless, on average, they successfully manage to keep up an ordered, laminar-like, appearance as a harmonic couple."

http://www.aps.org/units/dfd/pressroom/gallery/2011/kalpakli11.cfm

Wednesday, December 3, 2014

Saturn V Apollo SA-500F Shake Test at VAB 1966



"On October 14, 1966, a "boilerplate" full Saturn V and Apollo spacecraft stack inside the Vehicle Assembly Building is rocked back and forth by employees pushing with their feet and pulling with a rope so that stability and stresses which might result from winds at the launch pad can be measured. During the test the escape tower at the top of the Saturn V broke off and fell, but no one was injured."

Thursday, November 20, 2014

Shooting water droplets with powerful lasers


"The energy deposition in a liquid drop on a nanosecond time scale by impact of a laser pulse can induce various reactions, such as vaporization or plasma generation. The response of the drop can be extremely violent: The drop gets strongly deformed and propelled forward at several m/s, and subsequently breaks up or even explodes. These effects are used in a controlled manner during the generation of extreme ultraviolet (EUV) light in nanolithography machines for the fabrication of leading-edge semiconductor microchips. Detailed understanding of the fundamentals of this process is of key importance in order to advance the latest lithography machines."

"In this video we show the impact of a focused laser pulse onto a millimeter-size drop in a regime comparable to what can be found in lithography machines. The drop’s life was recorded for various impact conditions by high-speed imaging at 20 000 frames per second (FPS). The high reproducibility of the dynamics allowed us to use stroboscopic illumination with nanosecond exposure times leading to an effective frame rate of 10 million FPS. We present a scaling law and compare experimental results to numerical simulations, in order to show how the drop is propelled and deformed."

Authors: Alexander L. Klein, Wilco Bouwhuis, Claas Willem Visser, Henri Lhuissier, Chao Sun, Jacco H. Snoeijer, Emmanuel Villermaux, Detlef Lohse, and Hanneke Gelderblom

Monday, November 17, 2014