Slashdot Mirror


User: trtmrt

trtmrt's activity in the archive.

Stories
0
Comments
45
First seen
Last seen
Profile
(view on slashdot.org)

Comments · 45

  1. Re:information please! not just hot air! on One-Way Ticket to Mars? · · Score: 2, Informative
    So no, it's not getting quite close. Let's say we need 1 unit of power to lift off from Earth, we would need less than half a unit to lift off from Mars


    Since kinetic energy goes like the square of the velocity you would need a quarter of the energy on Mars to reach escape velocity (since it's approximately 1/2 of earth's escape velocity). This still doesn't tell you much about the level of technical difficulty needed to achieve even that on Mars.
  2. Re:You guys have it all wrong... on Colorization of Mars Images? · · Score: 1

    The two images were stitched together differently. The image in the stitch that contains the sundial has it's left and right edges covered by the adjacent images in one and not the other full image. That's why you don't see the full sundial in one of the images. You can see this easily if you overlay (or subtract) the two images in the Gimp and play around with transparancy. The two color markers that you can see in both images have pretty similar colors to me. It's only strange that the green marker is almost invisible. Maybe the aliens took it because it's green :).

  3. Re:Why do they make those funny noises? on Nobel Prize for Medicine For MRI · · Score: 1

    The noises you hear during an MRI scan are the gradient coils switching on and off. They differ from sequence to sequence and the prescription for a particular scan. I guess funny depends on your sense of humor :). There haven been people that have made MRI sequences that can actually play arbitrary sound waveforms through these noises that the gradients make so that the scanner could "say" different instructions to the patient. I don't know if they sampled some jokes so that the gradients could really sound funny.

  4. Re:Interesting Idea... on Turing Award Winner On The Future of Storage · · Score: 1

    I think the problem is in the speed. The bigger the platter the longer it will take you to get to where you want to read (assuming the head moves at the same speed). There are probably all sorts of mechanical and heating problems if you try to spin larger platters faster. Hard disk speeds have not been increasing as fast as their storage capacity so this is probably something you wouldn't want to sacrifice.

  5. Re:Looks like it shouldn't work indeed. on Solar Sail Will Work, says Planetary Society · · Score: 1

    Energy is always conserved. If you fire a photon perpendicular to a mirror that is parallel to another mirror each time it would bounce off the mirror it's momentum (thus its energy) would decrease since it would impart momentum (energy) onto the mirrors. Eventyaly the photon would get completely absorbed by the mirrors and its momentum and energy would be transfered to the mirrors.

  6. Re:Any good technical descriptions? on Backscatter X-Rays Coming to Airports · · Score: 1
    X-ray backscattering has been studied on an experimental level pretty extensively for quite a while. Perform a Google search on bremsstrahlung.


    Bremsstrahlung is radiation produced by accelerating or decelerating charged particles. It is often used to produce X-rays and this is the only connection it has to backscattered X-rays.

    Backscattered radiation is just that - radiation that has been scattered back toward the source (180 degrees scattering angle). This means that they are measuring what gets bounced back off the surface to reconstruct the objects.
  7. Petition for Linux port of Half Life 2 on Neverwinter Nights for Linux · · Score: 4, Interesting

    There is a petition to port Half Life 2 to Linux on
    riblet that would be given to Valve. They have about 3000 confirmed entries by now. This is a good way to show how much interest there is to port games to Linux.

  8. Re:Matlab! on Running a Research Lab on Free Software? · · Score: 1
    Use whatever makes your lab the most productive. Standard lab software like LabView, Matlab, and Mathematica are a safe way to implement software since they're so popular and they're more efficient and productive than C/C++ or VB. If you need high


    I will be slightly off topic but...
    I would agree with the first sentence. I am not sure about the rest. While gui's and standard functions (fft for example) are easier and "safer" to work with in the applications you mentioned I have had problems in Matlab and Mathematica that made using them not so safe. Mathematica has basically a huge memory leak. In every function you define everything that is ever evaluted in that function is stored (standard calls to clean up things in Mathematica's "main loop" don't work in functions). This means that a simple for loop that sets a variable equal to the counter can drain your memory! Something similar to this happend to me. It took me months to solve this problem (in the end Mathematica support told me about a developers functions that clears the cache). This problem is aboput 10 years old - a friend of mine told me that he had the exact same problem a long time ago which was one of the reasons why he decided against geting licenses for Mathematica for the university he works at. The other reason was the silly price and endless password reregistrations that Mathematica requires. For such expensive software this seems like a bug that should have been fixed in 10 years (or it means that nobody really uses functions in Mathematica). I like many things about Mathematica and I will use it again along with Matlab and LabView since they are good at many things but stupid bugs like this in very expensive software drive me crazy.
  9. Re:Mouse Gestures here Re:Opera has lost it's appe on Opera Releases Version 7 For Linux · · Score: 2, Insightful

    I found that an advantage of Opera gestures is that you use them by clicking the right mouse button. In Mozilla you have to use the left mouse button if you want to get anything usable out of the gestures which is still a bit awkward. Configuring them for the right button combines the gestures with the context menu which just doesn't work. Also Opera captures the gestures much better than Mozilla that doesn't figure out the gesture pretty often.

  10. Re:If you're ever in Washington, DC on Getting Inside Einstein's Head · · Score: 2, Interesting

    Actually, the statue has a focal point for sound. If you stand in the marked point in front of the statue (I think it's a point on a star map) and speak you can hear this.

  11. Digital cable compression on Whether (And When) To Buy HDTV? · · Score: 1

    Maybe a bit offtopic. I just upgraded to digital cable from Comcast (they had a promotion and they have on-demand, a tivo like feature). While the on-demand is really great the quality of the compression is horrible on some channels and noticeable on most. I find this really annoying and I will probably downgrade to analog because of this. Does HDTV also have compression and who determines the quality (the cable company or the networks)?

  12. Hungover geeks on Instant Concert CDs? · · Score: 0, Offtopic

    Wow, I am in disbelief. Two posts this morning and nobody has replied to them, and one of them concerns the RIAA!!?.

  13. Re:Washing Machine on Priest Brews in Washing Machine · · Score: 1

    European washing machines have thermostats which usually go up to around 90C (194F). I don't know about the 40F (5C) - you don't need to freeze you underwear. He might have hacked the thermostat to go that low.

  14. Re:Too late on Major Step Forward For SVG in the Desktop · · Score: 1

    Which iconsets use this under KDE? Do you need to turn SVG on somewhere in KDE? I use Carlitus' Noia iconsets which look great but they are not SVG.

  15. Re:little 'X' button to close tabs? on KDE 3.1 Released · · Score: 1

    In the toolbar (top right) you have two new icons. The first one creates a new tab the second one closes the current tab. You can also right click on the tab to get a context menu wich has "close tab" as one of the options.

  16. Thanks KDE team on KDE 3.1 Released · · Score: 5, Interesting

    The speedup in 3.1 is very noticeable. It looks great but also everything is much more responsive then before.
    I don't quite understand the complaints people have about KDE looking like windoze. Yes, it has windows :) but it feels so much different (i.e. better). The only issue I had before was that KDE was always slower compared to windoze running on the same machine but that difference seems to be almost completely gone.

  17. "Open" music CD on Verizon Loses Suit Over Subpoena of Subscriber Info · · Score: 1

    After all these RIAA, DMCA, music sharing Slashdot stories in the last couple of weeks I got an idea. First: Why not ask a couple of bands to donate a song or two (no copyright) for a CD that would be released only online. You could download each song separately for $1 as a wav that you could burn on a music CD or you could download it as an mp3 for $0.40. This is I guess the ideal way that the Slashdot crowd would want (maybe we slightly different prices?). The money from sales would pay for the hosting and bandwidth and the rest would go directly to the artists. Second: Track the spread of theses songs (they would have to be previously unreleased) on the p2p networks and see if this kind of publishing pays of for the artist. This is the nontrivial (if not impossible) part of this idea (to acurately estimate the total number of downloads on p2p networks, as compared to the number of payed downloads from the official site). This would be a proof of concept for artists to see whether it is economically reasonable to publish their work online.

  18. Re:Quirktime and Windoze Media on S-11 Redux: (Channel) Surfing the Apocalypse · · Score: 1

    Mplayer playes quicktime:

    http://www.MPlayerHQ.hu

    I am just watching the movie under Linux.

  19. Re:Browser identification on The Real Scoop On Philips' Streamium · · Score: 3, Informative

    Did you change the browser identification? I am using Javascript in Phoenix and I don't have any problems.

    Try doing this:

    gconftool -s /apps/galeon/Advanced/Network/user_agent --type=string "Moz 1.0 Win98"

    Now Galeon should identify as Mozilla on windows.If you already did this I am out of suggestions... :(

  20. Browser identification on The Real Scoop On Philips' Streamium · · Score: 4, Informative
    You can only access myPhilips.com if you are running Windows or MacOS -- Try it, I'm not kidding! I want to strangle whoever the webmaster of that website is. I have to reboot into my Windows partition every time I want to change some setting on my account.


    You can just change your browser identification. I don't know what browser you usually use but I just tried with Phoenix (showing itself as Mozilla 1.0 on win98) and the login page worked (I don't know how the rest of the site behaves). Konqueror worked also.

    Brana