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Journal: Pro-TEK-shun for your car

Journal by ke4roh

Hoboken, NJ is paying $198,000 over the next 3 years so their
robotic parking garage will continue to function. Last week
hundreds of cars were jailed by the robotic garage's inability
to operate sans properly licensed software from Robotics Parking,
Inc., and the two sides had quite the spat when the companies'
operators were required to leave the garage so Israel-based
Ultronics could take over operations. Don't feel too bad for
the city, though, the 314-space garage, if full, takes in
nearly $63k a month, so the city gets half of the take to pay
off the capital expenses.

Announcements

Journal: How to Drive on Snow 2

Journal by ke4roh

I come from North Alabama, so I'm familiar with the problems driving on snow and ice. It's that one idiot out there who thinks (s)he can drive 50 MPH on snow that causes a problem. Perhaps some tips for drivers would be in order in addition to the sound guidance, "citizens are encouraged to stay off the roads today." I just vacationed in the Nevada mountains where they got 4 feet of snow in the week I was there, so here are my tips for driving on snow:

  • SNOW IS SLICK. ICE IS FOR HOCKEY. Snow is much slicker than rain on the street. You can control your car, but the slick snow must be respected. Ice is another matter entirely - it is absolutely treacherous. On ice, go straight and do not apply gas or brake. You have no traction on ice. (If we have a big ice storm, do not take a trip involving turns or acceleration.)
  • TEST BRAKING. Get going 10 MPH, check behind you to see nobody is there, and try stopping quickly. You will skid and probably swerve. Let off the brake until you're not skidding. Pump the brakes if you want to stop a little faster. Learn the limits of your vehicle. Be aware that it is much harder to stop going downhill than on level ground, and on a steep hill, it may be impossible to stop.
  • TEST STEERING. A simple curve in the road can be treacherous on snow and worse on ice. Know how your car behaves in snow, and be prepared for it to slide around.
  • STEER INTO THE SKID. To regain control of a skidding car, steer into the skid. Once you have control, decide whether it is best to turn more gently or try to stop. Allow plenty of space around your car in anticipation of skidding. It will happen.
  • DRIVE SLOWLY. 20 MPH is about as fast as you ever want to go on a snow-covered road, and then only when the road is perfectly clear of obstacles as far as you can see. Watch far ahead of your car. You will need the extra distance to respond on the slick snow. Make all movements slowly and gradually.
  • IF AT FIRST YOU DON'T SUCCEED, TRY, TRY AGAIN. If you get stuck going up a hill, you may be able to back up and try the approach again a few times.
  • LEARN TO DRIVE. Allow yourself plenty of time to get accustomed to driving in snow. Driving in snow is very different from driving in rain. In rain, the vehicle sometimes skids. In snow the vehicle frequently skids. Be patient and go especially slowly at first.
  • LOOK OUT! The driver who doesn't know these things is right around the corner unwittingly aiming for your bumper.
Science

Journal: Spooky Action Clocks

Journal by ke4roh
Do you have the time? NASA must have it quite precisely to pinpoint objects elsewhere (like rovers on Mars), and for your GPS receiver to work, the satellites must also know the time very precisely (and in turn, the receiver figures out the time as part of the solution to the equation).

Wouldn't you know it - someone wants a better clock. Here's an idea of how to make an atomic clock with precision of 1 second in 30 billion years using a trick einstein called "spooky action at a distance."

Space

Journal: Infrared Telescope Launches

Journal by ke4roh
A new space telescope lifted off this morning. CNN reports, "SIRTF observes in the infrared light band and its scientists joke that SIRTF loks at the 'cold, the dark, and the dirty.'" It "will look at clouds of dust between stars. At shorter infrared wavelengths SIRTF will be able to see through the clouds, similar to how fog lams can view objects further away than normal headlamps." SIRTIF will also examine some of the most distant objects. SIRTF will orbit the sun, lagging behind the earth, which will give it a more stable orbit than an earth orbit.
Space

Journal: Engineers Should Have Known

Journal by ke4roh
NASA has released presentation slides analyzing the external debris impact observed by cameras 82 seconds after launch of Columbia on STS-107.

Slide 10 offers several scenarios where one tile is lost, and in each, they conclude "no issue", even though in the same block on the table they site temperatures approaching double the design temperatures (F). Aluminum melts at 1221F, but it gets brittle before then. The same frigging slide notes the design max temp at 350F.

My theory: Tile was significantly damaged by the foam as per case 1 in the analysis, and on reentry, the airframe heated to the 790F temperature they predicted. It vibrated, wiggled, and finally broke under the force of the atmosphere - about 8 minutes prior to LOS. After the airframe broke beneath one tile, plasma entered the wing, exiting as very hot gas by the aft sensors that failed first, then the plasma carried heat to the wheel well where we observed more failures. All the while, plasma was eating away at the airframe holding other tiles, and the zipper effect happened.

Space

Journal: Space Update

Journal by ke4roh
DID SPACE JUNK FELL COLUMBIA?
U.S. Air Force Space Command radar indicates that some space junk (rocket parts, paint chips, or a meteorite) passed very near or possibly hit Columbia during its second day of flight. Read more here and here.

No word yet on which wing they found parts of.

NASA'S NEW SPACE PLANE
NASA is locked into using the Shuttle for the next decade or two because of International Space Station (ISS) considerations and the simple fact that the U.S. has no other manned launch vehicle at the time. They're talking about stepping up speed on the space plane production. Read more.

...LANDING A MAN ON THE MOON...
Did you realize we can't launch a manned rocket to the moon this year even if we want to? That's right. The first Saturn V rocket - the only design so far capable of reaching the moon - flew November 9, 1967. The last manned trip to the moon departed Earth on December 7, 1972 and returned on the 19th. They were on the moon from December 11 to 14. The last Saturn V, rather than going to the moon, hefted the U.S. space station Skylab into orbit on May 14, 1973.

Online, you can read the detailed history of the Saturn V, or read about the Apollo missions to the moon.

SO WHERE DO THEY GO?
If the Shuttle doesn't go to the moon, then where does it go? It flies at an altitude of 200 miles above the Earth. It can't get much farther away than that because of its weight. Travelling at 17,500 miles per hour, the Shuttle still falls towards the Earth, but its forward speed allows it to miss the planet. Then why bother to go just 200 miles up? Because from orbit, everything in the craft seems weightless. Everything is falling towards the Earth (and missing it) at the same rate. In microgravity (that's what they call it because it's not purely zero-gravity), you can subtract the effects of gravity and learn more about processes on Earth.

CASTING CALL
While I was in Students for the Exploration and Development of Space, I attended a presentation entitled "Liquid Phase Sintering in Metals." Having recently heard a terribly boring presentation on Space Shuttle window construction, I wasn't too hyped about a talk with such an uninteligible title. It turned out to be one of the best, though it was somewhat technical. The problem is how we manufacture tools on Earth. Die cast metals invariably have bubbles in them, and the size and location of the bubbles severely weakens the material. By studying the bubbles in microgravity, we can learn how to make better tools on Earth. Read more.

I know what "custody" [of the children] means. "Get even." That's all custody means. Get even with your old lady. -- Lenny Bruce

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