Slashdot Mirror


User: at_18

at_18's activity in the archive.

Stories
0
Comments
318
First seen
Last seen
Profile
(view on slashdot.org)

Comments · 318

  1. Re:Wikipedia on The Coming Atlantic Mega-Tsunami · · Score: 1

    frozen water displaces more water than when liquid.. when water freezes it expands.

    So you answered this yourself. When water freezes it expands, and suddenly peeks out to displace some air instead of water. The amount of water displaced is the same that went into forming the ice, not more, not less.

  2. Re:slowing rotation on Quake Changes Earth's Rotation, Moves Islands · · Score: 1

    Your teacher was right on the effect, but wrong on the exact value. The average slowdown measured is about two milliseconds per century.

    So 65 million years ago the day would have been about 20 minutes shorter than now, which isn't a huge amount.

  3. Re:I can only wonder on 2004 MN4 Asteroid Odds Inching Up Again · · Score: 1

    This asteroid has an orbit that takes him close to Earth from time to time.

    This page from nasa lists the close calls from 2029 on (apparently before 2029 the asteroid is passing far enough that it's not a threat).

  4. Re:I can only wonder on 2004 MN4 Asteroid Odds Inching Up Again · · Score: 2, Insightful

    I can only wonder how high that percentage has to go before we start making plans on how to avoid the posible impact.

    To 100%, of course. Now that the asteroid is closely monitored, the orbit can be measured with sufficient precision in a few more weeks or months of observations.

    Given that the predicted hit is in 2029, waiting two or three months will not be fatal.

  5. Re:IrfanView on Free Windows Software Without Spyware/Adware · · Score: 2, Insightful

    It doesn't install anything, and it's the lightest image viewer that I have ever seen.

    It has a function to enable bmp preview chaning the icon on windows explorer. If this function is enabled, looking at a folder full of bmp files will involve reading them all and resizing lots of image, so it might be quite slow. I recommend disabling that.

  6. Re:Bad Math Day? on Introducing Asteroid 2004 MN4 · · Score: 1

    Yeah, of course it was the surface... thanks for clarifying.

  7. Re:Why don't we know if it will hit? on Introducing Asteroid 2004 MN4 · · Score: 4, Informative

    So what's the bottleneck here? Poor imaging?

    Yes. The image on the telescope is not a theoretical point, but has a certain diameter depending on the telescope diameter, atmospheric distortion, ccd resolution, etc. So you cannot pinpoint the asteroid position precisely, but only give a bounding box.

    Combining multiple observations will give you more data, and you can start narrowing down the estimate. Right now the error on the position, projected to year 2029, is about 200 times bigger than the diameter of Earth, so we say that there's a 1/200 probability of impact. A planet is a very tiny target.

    When the precision is sufficient to say that, for example, the asteroid will pass by the left side, it will suddenly drop to zero. If it is actually going to impact the Earth, the probability will slowly going up until it will reach 1.

  8. Re:The real point on World's Thinnest Flash Memory Cell Unveiled · · Score: 1

    1/2 hour for 1 GB is less than 1MByte/second, so you must have an USB1 flash card or one of those USB2 "full-speed" that are still 11 mbit/sec instead of 480 mbits.

    A real USB2 flash card can download three or four times faster (it will be limited by the flash r/w speed, not the bus), and it's comparable to a 32x cdrom.

  9. Re:What software? on More on the Dangers of eVoting · · Score: 1

    It happens in the following case:

    if selection == "kerry":
    votes["kerry"] = votes["kerry"] + 1
    else if selection == "bush":
    votes["bush"] = votes["bush"] + 2

    easy, isn't it.

  10. Re:On a side note on More on the Dangers of eVoting · · Score: 1

    I sure hope they don't. It would mean that a vote can be traced back to a certain voter.

  11. Re:That is one interpertation. Doesn't explain the on New Bin Laden Tape Surfaces · · Score: 2, Insightful

    Doesn't explain the withdrawal from Iraq does it?

    There's no need. 80% of Spain population was already against the war, and the government went in Iraq anyway. No surprise that it got booted out of office.

  12. Re:Aliens on Cassini Probe Does Titan Flyby · · Score: 1

    "Live" means live from the control room. There isn't any realtime video camera on the Cassini.

    The images come from something like a CCD photocamera optimized for astronomical observation. They are saved on an internal memory buffer and transmitted back several hours or even days later. Even if there's some ET waving at it, Cassini would probably not even see it.

  13. Re:That is NOT correct. on Murphy's Law Rules NASA · · Score: 2, Interesting

    Scaled Composites, for example, has demonstrated a suborbital craft capable of barely reaching space for a cost of around $25 million. In comparison, NASA developed and flew three X-15 prototypes with similar capabilities for a cost of $300 million in 60's dollars (which incidentally was considered a cheap program).

    With the small difference that Scaled Composites is benefitting from 30 years of technology advancements. I don't think that an equivalent company of the 60s could build three SpaceShipOnes for $300 million.

  14. Re:Unnecessary on E-Voting Problems Are Mostly User Error, Says ITAA · · Score: 2, Informative

    That's not just the UK. Almost all European countries vote in the same exact way. And no one this side of the Atlantic was able to figure out why Florida's manual recounts took more than a few hours.

  15. Re:legality on CherryOS Not All It's Cracked Up To Be · · Score: 4, Informative

    You can rebrand it, but you cannot claim it as your own. You must list the original authors of the code.

  16. Re:Life extension w/o nanobots on Ray Kurzweil On IT And The Future of Technology · · Score: 4, Insightful

    The above suggestions will only allow you to live maybe a few years more than the average human lifespan.

    Kurzweil is looking to life extension of centuries and thousands of years, quite a difference. That's way he gets headlines.

  17. Re:Don't have that menu option on Firefox 0.10.1 Released, Fixes Security Hole · · Score: 1

    It's different in the Windows/Linux versions.

  18. Re:memo to self on Mount St. Helens Alert Status Increased · · Score: 2, Interesting

    You mean like the 300,000+ people who live on mount Vesuvio?

  19. Re:Isn't - on BMW Shows Off World's Fastest Hydrogen Car · · Score: 5, Informative

    Does anyone remember the Hindenberg?

    Hydrogen was not the cause for the Hindenberg disaster. Hydrogen burns without any visibile flame or smoeke. In the Hindenberg case, what burned was the external paint, which had a chemical composition quite similar to nitroglicerine (it wasn't known at the time).

    Even more sad, most the deaths from that disaster were people jumping down while the ship was still in the air. Most of those who remained in the airship survived.

  20. Clarification on When Galaxies Collide · · Score: 1

    smashed together thousands of galaxies and trillions of stars.

    In such an event, trillions of stars aren't smashed together. Some of the galaxies might merge, but individual stars would pass one next to the other with no harm - the space between them is much, much bigger than their dimension.

  21. Re:I'm waiting for the 'Think about the Children' on Town Fights FOI Request for GIS Data and Images · · Score: 3, Insightful

    From 12 september 2001 until bush started talking about invading Iraq.

  22. Re:Here's a metric. on Wikipedia Hits Million-Entry Mark · · Score: 2, Informative

    The 358MB file you mention is only compressed text. Images and other binary files are a few gigabytes.

  23. Re:Here's a metric. on Wikipedia Hits Million-Entry Mark · · Score: 1

    The main reasons a paper encyclopedia has far fewer articles than Wikipedia are manpower (you can only write so much without hiring thousands of writers) and paper costs and size (who wants a 300-volumes encyclopedia in their home?). CD-rom versions are often transcribed from the paper version or, if only digital, still suffer from limited manpower and limited availble space. Do you know that the complete Wikipedia is already too big to fit into a DVD?

  24. Re:Press Release... funding on Antarctic Telescope? · · Score: 4, Informative

    'Software' algorithms could compensate for the effects of the atmosphere. (probably by using data gather by Hubble)

    No, you use Adaptive optics. Antarctica is particolarly good because the atmosphere effects are small, so the adaptive optics works very well.

  25. Re:The Calculations or Flawed for Canada on Saving Energy Without Derision · · Score: 1

    What you sat is that with a heat pump you can make 4 watts of heat out of 1 watt of electricity.

    Why don't you run those 4 watts into the heat pump again, hey you've got 16 watts. Now run all those into the heat pump, you have 64 watts. Repeat again....

    Quick, patent it before someone else discovers it! Of course you should aware that the US Patent office requires a *working model* before accepting a patent on perpertual motion, so you better start working now.