Author Topic: Science thread [merged]  (Read 18880 times)

Offline dwaino

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Re: Science thread [merged]
« Reply #15 on: August 28, 2012, 07:38:49 PM »
Latest images of the Martian surface taken by Curiosity:



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Offline Loui Tufga

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Re: Science thread [merged]
« Reply #16 on: August 28, 2012, 10:30:44 PM »
Latest images of the Martian surface taken by Curiosity:





Why isn't the sky blue?

Offline Yeahright

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Re: Science thread [merged]
« Reply #17 on: August 28, 2012, 10:55:06 PM »

Offline dwaino

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Re: Science thread [merged]
« Reply #18 on: August 28, 2012, 11:04:48 PM »

Why isn't the sky blue?

Not sure if srs O_o

But... it's because the atmosphere has a different composition and light is bent at different angles.

http://www.youtube.com/watch?v=IRsPheErBj8

 :lol could use a computer nerd at the moment. Can't find anything definitive on whether to use a fixed or offset voltage when overclocking a CPU. Load line calibration  :banghead :banghead :banghead
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Re: Science thread [merged]
« Reply #19 on: August 28, 2012, 11:25:46 PM »
Has anyone recently calibrated a pressure transducer? I've tried a deadweight but it's particularly sensitive and not having much luck.

Note:- it's the Piezoresistive strain gauge type (mono crystalline of course!) I've toggled with the L4s on the bridge circuit but no luck   :huh3

Offline dwaino

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Re: Science thread [merged]
« Reply #21 on: August 29, 2012, 12:06:23 AM »
Yeah I get all that but I think it's more of a nominal bridge resistance issue that's throwing things out...hmmmmmm I might have to take it to Marty's tomorrow

Offline Loui Tufga

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Re: Science thread [merged]
« Reply #22 on: August 29, 2012, 12:31:53 AM »
I have never had this issue with the deadweight tester :huh Are you using all the right type of instruments?
When I do the test I follow this procedure......
First: You need the following recently calibrated instruments - deadweight tester, voltage source, and DMM. Remember that the accuracy of your calibration is only as good as the total uncertainty of this "system." (Note: Some deadweight testers can be calibrated for your local gravitational constant! There are also other types of pressure generating equipment available, but they all depend on a known-good gauge/transducer.)
Second: I use an 11 point test: 0% 20% 40% 60% 80% 100% 80% 60% 40% 20% 0%. Slowly rotate the piston at each step so stiction doesn't affect your reading. Going up and down on the pressure will check for hysteresis, especially important with gauges.
Third: Keep good records and check on a regular basis.

Be very careful when comparing the accuracy of pressure transducers! There appears to be no standard convention so different manufacturers will state different numbers which are difficult to compare.

Let us know if you can't get a reading, I do have another way ;)


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Re: Science thread [merged]
« Reply #23 on: August 29, 2012, 08:05:52 AM »
All good - was the nominal bridge resistance issue after all  :thumbsup

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Dooks

Online wayne

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Re: Science thread [merged]
« Reply #24 on: August 29, 2012, 12:39:00 PM »
Latest images of the Martian surface taken by Curiosity:




That looks like the hill that Arnie fell down and cracked his helmet.
That's it, sir
You're leaving
The crackle of pigskin
The dust and the screaming

Offline dwaino

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Re: Science thread [merged]
« Reply #25 on: October 29, 2012, 10:16:03 AM »
I was looking for some info on that starfish with human teeth and found this that I know a few people would be keen on

NSFW
http://www.cracked.com/article/125_13-real-animals-lifted-directly-out-your-nightmares/

But being from cracked.com just be warned that some of the language may not be safe for work
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Offline Eat_em_Alive

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Re: Science thread [merged]
« Reply #26 on: November 06, 2012, 10:48:16 PM »
I was looking for some info on that starfish with human teeth and found this that I know a few people would be keen on

NSFW
http://www.cracked.com/article/125_13-real-animals-lifted-directly-out-your-nightmares/

But being from cracked.com just be warned that some of the language may not be safe for work

Interesting viewing, are they all supposedly real or are they taking the pee?
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Offline dwaino

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Re: Science thread [merged]
« Reply #27 on: November 07, 2012, 12:17:54 AM »
They're all fair dinkim.
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Offline Eat_em_Alive

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Re: Science thread [merged]
« Reply #28 on: November 07, 2012, 10:30:45 PM »
The anywhere, anytime Tigers.
E A T  E M  A L I V E  M O F O S

Offline dwaino

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Re: Science thread [merged]
« Reply #29 on: November 15, 2012, 10:15:50 AM »
Are humans getting dumber? http://m.thestar.com/news/gta/article/1287365--are-humans-getting-dumber-one-u-s-biologist-thinks-we-ve-got-nothing-on-hunter-gatherers-of-old

I was just talking to the missus about this the other day. Many don't realise, but you would of had the same quality of life in ancient Egypt, even early Rome than we all do now. The Egyptians had antibiotics and other medicines to cure ailments from naturally occurring sources. Aristophanes even proved the world was round and almost pinpointed the circumference. We're cheating Darwinism with technology and it's the only reason we're still around.
« Last Edit: November 15, 2012, 10:37:25 AM by dwaino »
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