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Recent content by jimmy neutron

  1. J

    Excel and Airy function's

    Does anyone know if it is possible to determine Airy functions in Excel? I thought of using the formula that give Ai(x), Bi(x) in terms of Bessel functions: Ai(x) = 1/pi sqrt(x/3) K_1/3(2/3x^3/2) Bi(x) = sqrt(x/3) ( I_1/3(2/3x^3/2) + I_(-1/3)(2/3x^3/2) ) However, Excel does not evaluate...
  2. J

    why 'beta' of transistor increases with temperature?

    BJT's are formed from doped semiconductors. Semiconductor properties can be quite sensitive to temperature. For a conductor, resistance increases with temperature. In a simple model, this can be thought of as due to the increased motion of the atomic cores that inhibit the flow of conduction...
  3. J

    Biot-Savart Law - Electromagnetics - Unanswered Questions!

    Re: Biot-Savart Law - Electromagnetics - Unanswered Question If the magnetoc field is truly static then no current will be induced in the steel plate. However I wasn't sure if Jackson 1928 was looking at a situation when the magnetic field was first turned on or if the plate was being brought...
  4. J

    Biot-Savart Law - Electromagnetics - Unanswered Questions!

    Re: Biot-Savart Law - Electromagnetics - Unanswered Question I don't think I can help too much, though can hopefully shed some light on your problem: 1) The Biot Savart Law is only strictly true for time steady currents. When you look at currents that change in time you have to take into...
  5. J

    Voltages across Capacitors

    How about this approach? You have two (obvious) loops to apply Kirchhoff's voltage law (KVL): Loop 1: 10 V battery and C1 and C3 Loop 2: 10 V battery and C3 and C2. Capacitors store + q on one plate and -q on the other. In the attached figure the Q's are +ve and are placed on that side of the...
  6. J

    any free sources to test my paper against PLAGIARISM ?

    Ideally the institution where you are studying should present an introductory lecture on plagarism, discuss the software they use and possibly give an example.
  7. J

    A simple explanation of quarks and leptons

    Re: quarks and leptons Pions have spin zero? eg see: https://en.wikipedia.org/wiki/List_of_mesons
  8. J

    BJT- thevenins or Voltage Divider to use

    I think the methods (voltage divide rule) and Thevenin's will give different results. Look at the attached figure: The voltage divide rule makes the approximation that the current flow into the base is so small that it can be neglected. This is a reasonable approximation since expect the...
  9. J

    new to fdtd .... how to simulate electromagnetic wave equati

    Re: new to fdtd .... how to simulate electromagnetic wave eq do you have it as a .zip file? Thanks
  10. J

    FDTD (2D & 3D including Parallel FDTD) Codes are here

    Re: periodic boundary fdtd Do you have as a .zip file? Thanks

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