Slashdot Mirror


User: drinkmorejava

drinkmorejava's activity in the archive.

Stories
0
Comments
28
First seen
Last seen
Profile
(view on slashdot.org)

Comments · 28

  1. IRS Data? on IBM Stops Disclosing US Headcount Data · · Score: 1

    Don't we have an organization in the US called the Internal Revenue Service that receives tax forms from IBM for every employee and contractor? Sounds like a pretty good data source to me.

  2. Re:No quite yet. on VASIMR Ion Engine Could Cut Mars Trip To 39 Days · · Score: 1

    I'm not sure what formula you are using. The most simplistic thrust formula you'll see is T=me*Ue+Ae(Pe-Po) where Po is zero in space, m is the time derivative of mass exiting the spacecraft, and Ae is the area of the exit nozzle. This doesn't exactly apply to non-fluid mechanics though.

    If you're slowing down the particles and generating a magnetic field, there's not necessarily any momentum transfered to the spacecraft. Kinetic energy can be exchange for a lot of stuff, heat, electric charge, and of course, an opposing force.

  3. Re:No quite yet. on VASIMR Ion Engine Could Cut Mars Trip To 39 Days · · Score: 1

    The speed of sound in space is not relevant, only the backpressure (pressure of the outside atmosphere) will matter. Mach 1 at the throat is calculated as sqrt(gamma*R*T) where T is in kelvin if R=287. Gamma will most likely be 1.4 and is pretty constant for ideal gases. T can vary greatly, but 3000K is around the right order of magnitude. Once flow hits the sonic condition, Bernoulli's principal switches, and you'll actually use an expanding nozzle to get a higher exhaust velocity. A cool thing to look out for are the plumes on the shuttle engines as it enters the upper atmosphere. These are due to a lower backpressure, and result in less efficient operation.

  4. Re:No quite yet. on VASIMR Ion Engine Could Cut Mars Trip To 39 Days · · Score: 3, Interesting

    Actually, conventional rockets are not limited by the rate of reaction. Momentum is limited by the density of the gas and the cross sectional area at the throat of the nozzle where the flow hits the sonic condition. You could speed up the reaction a million times and increase the pressure in the reaction chamber as much as you wanted, but the flow will absolutely not go any faster than Mach 1 at the throat, period. ...Just saying. And yes, I am a rocket scientist.

  5. Re:Physical access on What Restrictions Should Student Laptops Have? · · Score: 1

    You obviously have not used any remote monitoring tools.

    Just to pick one, look at kaseya. Unless everything on the network is locked down, it is going to find a way to connect to the server. Heck, by default it gives you a half dozen ways of remote viewing (mstsc, vnc,..) without manually installing anything beyond the small client package. It's very good software from a management perspective, but using it in a moderate size and diverse environment, it's border-line malicious.

  6. NWA on Strict Order Boarding Would Get Planes in the Sky Faster · · Score: 1

    Didn't NWA save 5-10 minutes when they switched from section boarding to the free for all?

  7. Re:More interesting is on Very Large Array Gets Expanded Capability · · Score: 1

    Not only that, they'll even be able to decrypt the GSM signal now. I don't think the aliens are going to be too happy.

  8. Re:Internal or export? on WTO Awards Caribbean Country Right to Ignore US Copyright · · Score: 1

    It's domestic only, which means it will have to be highly regulated by the Antiguan government, or people will begin exporting goods, which then opens them up to getting sued. I also wonder how many people actually realize that online gambling isn't banned from either domestic or international sites. Only bets placed with US credit cards are illegal which a) affects both domestic and international companies equally and b) allows many payment alternatives included cash, check, and bank transfers. The only difference is it might take a few more days to mail payment, which would be an easily defensible subject given that the US is not responsible for their geographic locations.

  9. Re:What about? on How We Might Have Scramjets Sooner than Expected · · Score: 1

    Unless something new has come up. They produce wayyyyyyy too much heat. The engines literally melt themselves apart after a few minutes.

  10. Re:Video game ? on First Robotic Drone Squadron Deployed · · Score: 1

    They are, it'll be version 3.0 and is supposed to be out near the end of the summer. Of course, that's after already being pushed back about two years.

  11. Re:Oh noes, some other country may pull its weight on US Can't Meet The "Grand Challenges" of Physics · · Score: 1

    There are far reaching industrial implications for high fuel prices. The high fuel prices (above the US price) that European consumers are used to are almost completely attributed to government taxation and regulation, something which the chemicals, manufacturing, and fossil fuel intensive industries of Europe are not nearly as subject to. The economic impacts of high gasoline prices are easily trumped by what could happen if crude prices rose to level where the current European gasoline price was determined by market factors instead of being artificially inflated by policy.

  12. Indirect Observation on Extraterrestrials Probably Haven't Found Us - Yet · · Score: 1

    I haven't RTFA, but if they're looking for an "intelligent" civilization, a probe visiting every planet would be completely unnecessary. They'd only have to be close enough to detect radio transmissions. Assuming their equipment could detect the faintest of signals, and the first regular high powered transmissions occurred 80-90 years ago, that's enormous compared to finding a single planet.

  13. Parody on Apple Sues Over iPhone Smartphone Skins · · Score: 1

    I wonder how legitimate it would be to say, change the skin color and call it a parody.

  14. Role of Search Engines? Google SafeSearch on The NSFW HTML Attribute · · Score: 1

    Just a random idea, Google already seems committed to protecting users from objectionable content with their SafeSearch technology. It wouldn't necessarily be a bad idea for them to support the tag in order to further protect users. In return, porn sites willingly adding the nsfw tag could have their PageRank bumped up a fraction.

  15. Re:Uhhh... on Newest Energy Source — Pond Scum · · Score: 1

    Did you just learn about this now on Wikipedia, or have you even taken an intro level econ course? Like PCM2 said, free markets can create "less than socially optimal" conditions where the total cost to society is greater than all costs realized by the company. Once again I agree with PCM2 that it's unlikely the free market will decide by itself to come up with a solution, however, you fail to make the distinctions that 1) the market is perfectly capable, in all aspects, of handling any outcome of global warming/expensive oil/disgruntled consumers/whatever assuming that the entire world doesn't cave in on itself and 2) that the market will have to come to terms with the costs eventually, just not at a time of it's choosing

    Another free market concept that might interest you in called the Coase Theorem which allows that if the social cost is assigned to any arbitrary entity such that they have the power to manage it, the free markets will be able to absorb the costs. You say the carbon market is imposed by the government, but really, the only thing that has really happened is it has been created. Pretty much everything is left up to the producers to figure out. Eventually these costs would be fully ascertained by the markets, the only thing difference is the government has decided it might produce a greater consumer surplus if the costs were realized now instead of later.

    You seem so negatively viewed towards free markets, yet you fail to understand their beauty and how time and time again they prove themselves.

  16. Re:Titans on Mark Cuban Declares War on GooTube · · Score: 1

    Gee, nm that Youtube/Google isn't actually accountable for the content their users post.

  17. The merger would lower the cost of low-end comps on ATI and AMD Seek Approval for Merger? · · Score: 1

    As much as I'd hate AMD merging with ATI, it would lower the cost of low-end systems. An AMD CPU with integrated graphics solution from ati, as well as a chipset from AMD/ATI would be cheaper than say, a Sempron and a vendor having to go out and get a separate GPU. Same reason Intel has such a large graphics market share.

  18. Costs? on 'No Alternative' To Microsoft Fine · · Score: 1

    What I'd like to know is how much it would actually cost them to go back into everything and document it all, probably a significant portion of the fine. I'm pretty sure the loss of market share alone would be substantially more than the fine anyway.

  19. Logitech Mice on Input Solutions for Repetitive Stress Victims? · · Score: 2

    I know someone said something about an intellimouse, which are pretty good (I can't stand the scroll-wheel though), but what about all the higher-end Logitech mice (mx500 and up, I have an mx700). Using a laptop mouse, or even a normal mouse for a full day, my hand will start to hurt, but with the Logitech mice, my hand is basically in it's natural resting/cupped position. Almost all the movement is done with the wrist and your thumb is basically dead resting in the grooved side.

  20. Re:Random? on A New Technique to Quickly Erase Hard Drives · · Score: 1

    If it was a constant field, pretty much yes. I'm sure they varied it several orders of magnitude at least a few thousand times though; in which case, there really would be no discernable pattern.

  21. Re:lots of questions ? on New Wide-Angle Telescope to Capture Night Sky · · Score: 1

    If they can manage to get an OC-192 out there running at a full 9.6gbps, then yes, it would take about 7 hours (25,000 seconds).

  22. Re:Choke the internet? ... on HD Video Could 'Choke the Internet'? · · Score: 1

    lol, 20gigs, I downloaded a 60 gig split rar of rainbow tables a while back, took damn near forever but hey. BT FTW

  23. Re:Can't you just use pop mail? on RIM Strikes Back, Files Countersuit Against Visto · · Score: 1, Insightful

    Yes, however, POP does not support email pushing which is a large component of it's success. To have it constantly check a server and have to make a data connection with the towers kills the battery life. I believe treos actually, popup a message about it if you set the time to less than 1 hour.

  24. Interesting... on Automating Future Aircraft Carriers · · Score: 0

    So buy a new aircraft carrier for $4 billion or two B2 bombers for $4.4. Now that's a dilemma

  25. Re:Here the problem arises. on The Problems with Broadband in America · · Score: 0

    Hmmm, a that's a rather negative outlook on the whole country.

    One of the bigger problems with broadband (all telecommunications actually, but the rest are more regulated at a national level which is more prone to the corruption you speak so highly of) is many communities chose to regulate it as a necessity, something like electricity, where they explicitly deny any competition in the area in the belief that it will ultimately provide a better quality of service. What they don't get is how little it actually cost cable companies, compared to the $45, to offer it. In the town right next to me they are limited to Comcast, they pay as much as we do, but their service absolutely sucks, whereas we have a choice. Granted, they all run off of the TimeWarner/RR network anyway, our quality is wayyyy better.