Slashdot Mirror


User: Calinous

Calinous's activity in the archive.

Stories
0
Comments
991
First seen
Last seen
Profile
(view on slashdot.org)

Comments · 991

  1. Re:How useful! on Solar Boat To Cross the Atlantic · · Score: 1

    "Good ol' rock. Nothin' beats that..." Wind is great, and it is better for propulsion that solar. There are advantages on each side... anyway, the solar boat is great to slowly move from point A to point B, as long as you are more interested in cruise

  2. Re:Solar? on Solar Boat To Cross the Atlantic · · Score: 1

    This might be great on a stationary platform - but there are plenty of issues for a ship-borne system.

  3. Re:Nice idea, but... on Solar Boat To Cross the Atlantic · · Score: 1

    The increased total volume helps at maximum power/maximum speed too. As the power a ship uses while cruising is used by the square of size (sectional area) and by the length (skin drag), you use less power per ton in a bigger ship (this might explain why supertankers need so much space to stop - I've heard about several miles from full speed to full stop). If you double the size (length) of the ship, you need at most 4x more power to propel it, but can carry 8x the load. Or you could increase the power 8x, but have one and a half maximum speed.

  4. Re:Solar? on Solar Boat To Cross the Atlantic · · Score: 1

    By what I know, Toronto is using one of the Great Lakes to get coldness (they use a recirculating water loop with deep water from the lake to air-condition buildings). The big problems in using the temperature differential between deep water and low water would be: 1. you need to recirculate a lot of water 2. the temperature difference is not so great (20+ Celsius at surface, 4 Celsius at depth) 3. all the piping used to move water will slow the ship down. How much? Doubling the sectional area would be possible 4. all the piping is heavy, and it will trail the ship, needing even more length to reach a certain depth 5. the cold water goes deep as it is denser. In order to bring the cold water at surface, you NEED to pump it 6. all the systems used to pump water and generate power based on the temperature differential would be big and heavy, so the ship looses internal volume and is submerged 7. not all seas are deep enoug 8. you need a place to store the cold water pipelines when the ship goes in port. This uses even more internal volume (or, if it is towed, increases drag and the necessary power). This could be a solution for a daylight-generation facility, using solar-heated "warm source" and deep water as cold source - and all the dead weight of the installation would be stationary (floating or on land). Not so for ships

  5. Re:How useful! on Solar Boat To Cross the Atlantic · · Score: 1

    Fell a tree? How many trees do you think will remain, not put to use for heating homes?

  6. Re:why? on Solar Boat To Cross the Atlantic · · Score: 1

    1. Sail use is forbidden in ports/marinas/..., so even if you would have advantageous wind and space to manoeuver, you are forced to use propulsion engines/motors 2. Electric motors and batteries have been used for a long time in navigation (submarines in first World War). Also, photovoltaic panels are not new. Catamarans (sailing catamarans) are at the fourth generation (I think), each generation better than the one before it. As the new solar-electric yachts use only old technology, there won't a big price decrease in the long haul. And I wouldn't dream of considering those fancy electric boats competitive with sailboats. There will pe people that want sailboats, and people that want to go on the sea/ocean, and not be interested in sails. The first ones won't take an electric boat (maybe a sail/solar hybrid), the rest won't take a sailboat.

  7. Re:No surprise here on Wii Hardware To Be Profitable At Launch · · Score: 1

    Microsoft is dumping money in a market hoping to obtain monopoly in that market. Once a monopoly is obtained, they will become profitable. If I remember correctly, Microsoft is profitable (extraordinary so) in the Windows and Office areas, the rest of the markets they are involved in shows them at a loss or small profit (I don't know about their hardware division, but I would like a Microsoft Natural keyboard)

  8. Re:No surprise here on Wii Hardware To Be Profitable At Launch · · Score: 3, Funny

    225 is a perfect square... Why would that be bizarre?

  9. Re:I predict on The Hard Drive Turns 50 · · Score: 1

    No, they won't put two hard drives in a single enclosure (or one enclosure with two independent rotation motors, actuator motors and so on). This would increase the price. As for writing data on two places on the platters, I think between buying a 5TB hard drive for $500, or buying just half of it for $500, my option is clear

  10. Re:Degausser = Electro-magnet on Cheap Bulk Eraser for Hard Disks? · · Score: 1

    But be sure (if the hard drive has iron/steel parts) to anchor it really well - you don't want it to go ballistic against the magnets

  11. Re:Top Windows writer abandons Microsoft on Windows Monoculture Myopia Revisited · · Score: 1

    I suppose there isn't a legal reason to not allow you to buy an XP home licence (no service packs), but install an XP Home with all the service packs preinstalled, driver slipped in and so on... But what do I know? I'm no legal, I don't study Windows licensing

  12. Re:Top Windows writer abandons Microsoft on Windows Monoculture Myopia Revisited · · Score: 1

    I assume you are suggesting him to install the operating system on a personal computer using the MSDN key his employer got from Microsoft? Not too good idea, if I may say so

  13. Re:Top Windows writer abandons Microsoft on Windows Monoculture Myopia Revisited · · Score: 1

    By using the "recovery partition" on the drive, you will lose all the data on the current partitions (what you will have when it finish will the the "virgin" image of the operating system, as sold. Everything else will be lost

  14. Re:Degausser = Electro-magnet on Cheap Bulk Eraser for Hard Disks? · · Score: 1

    Also, the metalic cover of the hard drive protects the actual platters against external magnetic field (at least some). You would need a strong magnetic field indeed to erase everything without opening the drive (and failing the warranty terms). If your data is so valuable, just buy new drives.

  15. Re:Proper enforcement is still key on How Retailers Watch You · · Score: 1

    I bought something once in a shop, it was deactivated. I went out, everything was fine. I entered in another shop, and surprise: the alarm starts :(

  16. Re:The great thing about wireless on Over 2.5 Billion Cellular Connections Now Active · · Score: 2, Informative

    Intel was able to invest 5M and offer coverage to the Gulf Coast. BellSouth will invest $700M (or $1B) and get coverage, offering a total bandwidth maybe 2 000 times more than Intel could offer with their $5M. It's all in what you want - if what you want is minimal access, those $5M goes a long way - if you want something more bandwidth intensive, you're out of luck

  17. Re:1 goat, 1 long knife on Blu-Ray and HD-DVD Playback Under XP · · Score: 1

    I'm not sure about the Pentium 90 thing, but I've saw DVD played on some Pentium 233MMX with an ATI 4MB video card, and a Creative accelerator. While on the monitor it had some quirks (colors/transparency), on a TV (using a TV-out connection) looked great

  18. Re:controller glove + AO rating... on Nintendo Reconfirms Wii Shipments · · Score: 1

    I think it's a shoulder massager

  19. Re:Biggest way for AMD to save power on AMD Says Power Efficiency Still Key · · Score: 1

    Shared L2 cache is good, as long as you can keep its latency down (as Intel did). The reason - one core can have to do a task that is limited in memory access (and uses just a bit of cache), while the other core can use all the rest of the L2 cache. As for the post I replied to, yes, Core2 is a totally new microarchitecture - derived from Intel Core, derived from Intel Pentium Mobile, which was started from the Pentium Pro/P3 architectures. This is, it has more in common with P3 than the Netburst/P4. Widening the FSB could be difficult - you must double the number of traces that carry a signal very vulnerable to delays. Increasing the frequency might be possible - running now on 266MHz signals, quad pumped (1033), and overclockers were able to get at the 500MHz - let's say you could double the FSB at most. As for the AMD and memory controller, how many times would have you upgraded the memory without upgrading the processor? And how many times would the usual customer do so? (I did changed the memory in my mainboard from SDR to DDR once - but for the next change, I will buy a new mainboard/processor). As for Sun and its 4 memory controllers - I suppose you want to refer to AMD's server processors, the Opteron, where each processor can have its own memory. Niagara has four memory controllers? Four Opteron cores have four memory controllers too.

  20. Re:CFLs vs incandescents on The Light Bulb That Can Change the World · · Score: 1

    Most of the burnt incandescent bulbs I've seen (three quarters or so) burned at "startup". If you start them using dimmers, the slow startup can save them from burning (there were some that burned during normal functioning, and maybe the older they are the more probable will be to burn), but I think you can improve the expected life time of incandescent bulbs)

  21. Re:Use a moment method with physical optics on Add Another Core for Faster Graphics · · Score: 1

    While printers usually have different X and Y axis resolution (see 600x1200, 600x2400 dpi effective, thanks to resolution enhancement technologies), displays usually have the same resolution on X and Y axis. Hmmm, from Dictionary.com: 12. the degree of sharpness of a computer-generated image as measured by the number of dots per linear inch in a hard-copy printout or the number of pixels across and down on a display screen. You might be right...

  22. Re:Use a moment method with physical optics on Add Another Core for Faster Graphics · · Score: 1

    Yes, we came a long way from there - now the processors are about 10 times as fast, and you could hope for 4 cores. This means, in the best case, that the rendering will take several minutes per frame. Anyway, did you take into account we came a long way from there with game resolution also? Doubling the resolution increases four times the calculation time.

  23. Re:The problem is not the bomb itself on Iranian Heavy Water Nuke Plant Goes Online Today · · Score: 1

    You should be sure that there are enough honest-to-god, good-willing, people in the military. Most of them try to do their official mission the best way they can, and they feel betrayed when they are held in doubt. Also, there are plenty who do unofficial missions, do things that (for them) are better not known. The original post belong to one of the first ones, doing honourable things. Some of the rest in Iraq are not like this, and this is too bad. As in other cases, the men in the line of fire are more human to their enemy than the ones in the warm back lines (prison guards, ...)

  24. Re:The problem is not the bomb itself on Iranian Heavy Water Nuke Plant Goes Online Today · · Score: 1

    During the war, the US and Britain indeed gave support to the USSR - planes (many flown from Alaska across Syberia), ammo, weapons and so on - but the supplies were much smaller than what USSR requested. They might have been a drop in an ocean, but they were well received indeed. As an example, the P39 planes were well regarded by russian pilots (many of them became aces on these planes). Russians asked for a second front when they were in the direst need - but only one year after, the Italian front opened. And even one more year after, the Normandy was stormed.

  25. Re:The problem is not the bomb itself on Iranian Heavy Water Nuke Plant Goes Online Today · · Score: 1

    4. Unlike US, which wants to export its version of democracy to the rest of the world. Just because you see the Iran's extreme islamism as bad, doesn't mean other see the US democracy good.