Slashdot Mirror


User: viking80

viking80's activity in the archive.

Stories
0
Comments
456
First seen
Last seen
Profile
(view on slashdot.org)

Comments · 456

  1. Re:Remember Force=Velocity x B (magnetic field) on Spacecraft May Surf Magnetic Fields · · Score: 1

    My point was how can this work? I can suggest to use a 300m sombrero made of nanotubes, that would give better performance than the 3 km carbon tether.

    But unless I gave a clue on why it would be better it would not be worth very much.

  2. Remember Force=Velocity x B (magnetic field) on Spacecraft May Surf Magnetic Fields · · Score: 4, Interesting

    Anyone who remember physics 101 will recall the following:
    A magnetic field will create a force normal to the velocity of a charged object. So
    1. The force on any charge will be normal to the velocity, so it will move around in circles. This includes the charged spacecraft. (The field here is not homogeneous, but still, no gain in energy)
    2. A current loop(i.e. a moving charge) can change the energy or be accelerated in a magnetic field.

    (2) is and has been used since the first satellites were orbited to do orbital corrections, and are well understood and used. It can allow the life of the satellite to be expanded by many years.

    Why would this craft not just use a long current carrying wire instead.

  3. stuff dont go faster than c but phase velocity can on Speed of Light Exceeded? · · Score: 1



    Simple example of something that appears to mover faster than light, but it is of course only phase velocity:

    Paint a dot on a distant mountain with a laser. Now move the laser around. The dot can easily exceed the speed of light even though none of the photons in the laser beam does.

  4. Hmmm, Choose: Party forever or be eaten by worms on Humans Hardwired to Believe in Supernatural Deity? · · Score: 1

    No gene needed here. I am dying, and have two options:
    1. Eaten up by worms,
    or
    2. Live forever, and party every nite with all the relatives that I loved.

    Even if (2) is a big lie, there is nothing to loose, so it takes a lot of character to willingly going for (1).

  5. Smacked into the floor hard on Hawking to Take Zero Gravity Ride · · Score: 1

    The average g-load is 1g, so you typically get 0g for 25 seconds, and 2g for 25 seconds and some time in between.

    I am sure Hawkins will handle 0g, but I wonder how he will feel during the 25 seconds of 2g. That is stressful even for a healthy person.

    Slamming on the brakes in a Porsche on a good track going from 250km/h down to 0 is a change from 1g to 1.28g (sqrt(1^2+0.8^2), so the vomit comet is 7 times that! You are certainly smacked into the floor hard, even with assistants.

  6. MEMS gyroscopes are available now; $20, size: 7mm on The Wii's MEMS Inventor on Future Technology · · Score: 1

    TFA: ...Today, such products are quite big, a cube 10 centimeters on a side. We want to do this in less than a 30-millimeter cube...

    Not sure island they have been living on, but this was actually available in the end of the previous century.

    Analog Devices and others have been selling the ADXRS150 http://www.analog.com/en/prod/0%2C2877%2CADXRS150% 2C00.html and many others for years.

  7. Expungement is the sealing of a criminal record on Randal Schwartz's Charges Expunged · · Score: 4, Informative

    Expungement is the sealing of a criminal record so it is not publicly available. The consequence might be that you can deny you have a criminal record, but it is quite different from a pardon, which is forgiveness of a crime and the penalty associated with it.

  8. Not even close on Fair Use Bill Introduced To Change DMCA · · Score: 1

    If anybody thinks the use congress will enact anything fair use, they are mistaken.
    Even the most fair-use oriented part of congress are with a great margin on the MPAA and RIAA side of things.

    Maybe the US needs a pirate party. http://www2.piratpartiet.se/international/english

    With the current balance in congress, a few seats may give great influence.

  9. Can't even get stable basic security cam software on Surveillance Cameras Get Smarter · · Score: 1

    I have installed some IP cameras and some regular cameras with a 4 port card in my PC. To date I have not been able to find even basic, stable software for them.

    Does anyone know where to get *any* decent software for security cams?

  10. Re:9000 feet is less than the average ROV: wiki on New Sub Dives To Crushing Depths · · Score: 1

    I agree with you on most of this:
    1. Time under water: Impressive
    2. Distance covered: impressive
    but
    3. Max depth: Unimpressive

    I was only challenging TFA: "increases the attainable depth of deployment over current submersibles", which is still incorrect.

  11. 9000 feet is less than the average ROV: wiki on New Sub Dives To Crushing Depths · · Score: 1

    This sub seems not to reach the depth the average ROV reaches

    From http://en.wikipedia.org/wiki/ROV ...More than half of the earth's ocean is deeper than 3000 meters, which is the current working depth of most of the ROV technology...

    For those who don't know the fathoms, feet and furlongs, 9000 feet is 2743 meter.

  12. protect children on Ex-judge Gets 27 Months on Evidence From Hacked PC · · Score: 2, Insightful

    So he is giving out child porn with a Trojan Horse embedded, and then illegally trespassing onto the (3000) infected computers.

    This sounds about as bad as it can get.

    From the article:
    "He... ignored police threats that if he didn't stop he'd be arrested for breaching privacy"

    I guess since "His motives was always to protect children who can't protect themselves", it is all ok.

  13. Maybe they should be investigated som more on MPAA Violates Another Software License · · Score: 5, Insightful

    I am quite sure MPAA would fail in many similar regards if someone would take the effort to investigate.

  14. How to get rid of Roland Piquepaille... on Storing Wind Power In Cold Stores · · Score: -1, Offtopic

    greasemonkey script to remove piquepaille stories
    http://userscripts.org/scripts/show/5735/

    Works well

  15. How about just running out of oil? on $25M Bounty Offered for Global Warming Fix · · Score: 4, Insightful

    Running out of oil will do this quite effectively, and that will happen within not too many years.

  16. Grand theft auto vs. circles on The Death Of CS In Education? · · Score: 4, Insightful

    A generation ago, back in the 70s, the science department on my highschool got a basic computer . I wrote a program that would show time with analog hands (calculated with sin(t),cos(t)).

    I tried to get my son interested in programming by showing him how to write som simple software that could draw stuff.

    His response was basically: "Why cant we make something like 'Grand theft auto'; This is boring"

  17. Re:Restitution? on MySpace Worm Creator Sentenced · · Score: 1

    You have to be careful when talking about "Criminal traspass" on a computer. I think the better allegory here is that somebody leaves all their savings in a pile in the driveway, and then somebody takes some of it. Of course it would be better to suggest to them that it is not a good idea to leave money laying in the drivway, but you can not convict someone of theft and criminal trespass unless the owner shows a decent effort to lock up the valuables.

    I presume the law in this area is still immature, but in the long term it shoud match common sense, and not be draconian like today.

  18. Re:One of my favorites on Confidential Microsoft Emails Posted Online · · Score: 1

    Not sure about MS, but at Cisco everyone are "Vice Presidents". I am sure they have a thousand of them. They also have quite a few "Presidents" and "General Managers" as well.

    Maybe VP the entry level position in Marketing?

  19. IMAGINE on Wi-Fi Phones Reviewed · · Score: 4, Interesting

    Imagine that most people turn on a wifi (Like the free Fon mentioned)
    Now, just enable these to connect and route traffic automatically
    Now,
    1. Everybody can now have a wifi phone with free
    2. Nobody will need an ISP
    3. Nobody will need a phone company
    4. Nobody can shut you off
    5. Everyone can have a fast connection
    6. You do not have to sign a service agreement
    7. what else?

  20. Here is how to get rid of Roland Piquepaille on An Origami Lens for Your Camera Phone? · · Score: 4, Informative


    Here is one of many greasemonkey script to remove piquepaille stories
    http://userscripts.org/scripts/show/5735/ [userscripts.org]

  21. This is just SCO meeting SEC reqirements on SCO Admits They Might Just Not Win - Maybe · · Score: 1

    This is just SCO meeting SEC requirement of disclosure to stockholders. They have to disclose all things that may seriously affect the company performance.

  22. Tax advice: R&D is fully tax deductible on Uncle Sam Spoils Dream Trip To Space · · Score: 1

    If the trip to space was Research and Development it would be tax free. It seems straight forward create a business, and plan an experiment in microgravity.

    Seems like he had very poor tax consultants.

  23. And they drive to work at 2400mph on Inside the Lucasfilm datacenter · · Score: 2, Insightful

    300TB storage and 11 petabits/s bandwidth.

    This means

    A) they can push their entire storage through the network in 300*8Tb/(11Pb/s)=200ms.
    or
    B) the article author does not have a clue.

    I think an anlogy would be: I drive back and forth to work everyday, or 400 times a year. My speed on each trip is 60mph, so in a year my speed is 60x400 or 24000mph.

  24. Norway is the wealthiest country on earth on Norway Outlaws iTunes · · Score: 1

    Excluding minor territories, Norway is the wealthiest country on earth.

    From CIA - The World Factbook https://www.cia.gov/cia/publications/factbook/

    GNP per capita of Norway is $46000. For comparison, USA is down a way at $37000.

    Otherwise, Norway is similar to Oregon in size and population.

    So Apple might feel this more than the size of the country alone would imply.

  25. Re:People are just too damn stupid for their own g on Microwave Experiments Cause Sponge Disasters · · Score: 2, Insightful

    >>>Back in good old days, many centuries ago, there wasn't any kind of this Politically Correct stuff and neither was there protection of the idiots. There was one rule: survival of the fittest....

    Yes, you just hogtied people to a stone, and threw them in the lake. The ones that sank drowned, and the ones that did not survived.

    Or you made them walk on burning coal. The ones that got burnmarks were killed, and the ones that did not could live.

    This is called survival of the fittest.