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Posts posted by pulkit

  1. I return to the forum after several months away .... good to be back !


    I needed some help and didn't know exctly where to post it so decided to do it right here ! Anyone got any nice idea for research topics in the field of digital systems or computer science or electronics ? Any help would be appreciated.....going through a sort of mental block currently :(

  2. Thank you.

    I want to ask one more question.

    In which concentration' date=' pH value is taken for a particular acid?[/quote']


    pH is a measure of acid concentration.

    So higher conc will give a lower pH (In most cases)

  3. Density will give you amount of compound present plus water in 1 cc. From temperature you can know density of water, subtracting this you will know amt of compount per unit volume. Multiply by appropriate factor (molecular weight) to get an estimate of molarity.

  4. I recently installed Suse Pro 9.2 on my laptop; it was a breeze and though I find Mandrake and Fedora equally easily to install and configure, I think if had to choose amongst the 3, I would choose Suse. Easy to configure -- Yast is awesome

  5. I tried to configure the netrwork but weird things were happeneing.

    I could ping my desktop from my laptop but couldn't ping my laptop from my desktop.

    I tried all sorts of diferent IP addresses and tried to set teh gateway on either of the two but the same thing kept happeneing again and again.

  6. Having studied Lagrangian mechnics somewhat by now, I must say I didn't understand the mathematical derivations used, but the methods of applications were mostly very mechanical and the differential equations obtained in the end did not seem humanly solvable.

  7. Pseudo random number generation is one way to do it.

    There are alternate methods to get random numbers direct out of harware or "true random numbers".


    I know this since java has 2 different random number geerators, one of which uses pseudo random number generation, asking for seeds etc whereas the other supposedly ives the true random numbers.


    Any ideas how they do it in hardware ?

  8. The metre was defined before speed of light was measured. It wouldn't be re-defined only so that speed of light becomes exactly equalt to 300 00 00 00 m/s.


    Only the defination of the metre was changed, prior to this definition it was defined with respect to a standard Platinum-Iridium rod kept at 273 K somewhere in France. The new definition ensures verifiability world-wide and is in some sense more general.

  9. oh is that so?


    then a Burst nibbler or 7 segment LED/LCD displays no longer exist either?

    4-bit codes like natural BCDs are very important.

    Maybe what he meant to say was that the word nibble is not very popular.

  10. ill give it a shot, but i really want to know how to do this stuff. how do you make a flood fill efficient enough to use for something like that?


    There could be some hi-concept algos to do it. These libraries generally contain super efficient implementations of stuff.

  11. PULKIT......there IS heating in the primary (with the secondary open), there's an AC voltage across the primary, the primary has an impedance that's a function frequency, thus current flows, thus heat is dissapated.


    Do not disagree one bit.


    Done calculations theoretically as well as seen it practically :))

  12. Even though I obviously don't know enough about this to justify trying to answer twice' date=' here goes: if by "hardwired" you mean that the calculator simply stores a huge array of ordered pairs corresponding to a sine or cosine function so that the input number is matched with the appropriate output number (rather than it being calculated by the computer upon execution), no, I'm almost positive that it's not done that way. In fact, I believe that sin and cos functions in one of the C math libraries can take a long time to compute (compared to the basic +, -, *, / operators), which would indicate that a calculation (such as a taylor series) is being performed.


    But when you look at the functions, there's a shockingly small range of values that need be calculated -- all you really need is one quarter of a period (e.g. the part from sin(0) to sin(pi/2)), since the rest of the function, or both, actually, is/are composed of identical curves that have been flipped around. So they may only need a few terms of the Taylor series to get decent accuracy.


    So yeah, I'd say it's a bunch of simple polynomial operations, like ".4-.4*.4*.4/6+.4*.4*.4*.4*.4/120" or something.[/quote']


    I did not mean a ROM when I said hardwired.

    I meant more of an electronic circuit that does sin/cos calculation. ( Think of adders, dividers, sqare root calculators etc. )

  13. and so any AC Electro magnet is subject to "feedback"' date=' by any incidental device that may even cause it`s destruction?


    edit, there`s stil no answer provided yet! :)[/quote']


    If you subject an electrical device to an electric field (voltage), it will get damagded.

    If you subject an electro magnetic device to magnetic fields it has the same effect - the magnetic vector potential will rise and have an effect analogous to electric current. I still see no sorcery at work :))

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