Recent content by gony rosenman

  1. G

    Help finding ths Fourier transform

    Homework Statement find the Fourier transform of the following function in two ways , once using direct computation , and second using the convolution therom . Homework Equations Acos(w0t)/(d2+t2) The Attempt at a Solution I tried first to solve directly . used Euler's identity and got...
  2. G

    Explaining a signal converting circuit

    you , my dear sir , are an angel ! thank you for the clear and thorough explanation . much appreciated :smile::partytime:
  3. G

    Explaining a signal converting circuit

    i have a drawing of a circuit that converts a signal in range [-5,5] V to a range [0,1.2]V . i wish to understand how it works.. i have basic knowledge of electricity as an undergraduate in general physics but a bit rusty , thus i am here looking for answers...
  4. G

    Hysteresis loop magnetization of Gadolinium

    alright , thank you for the quick reply! (:
  5. G

    Hysteresis loop magnetization of Gadolinium

    i'm not sure where you got the idea that i didn't have enough data points . i used liquid nitrogen and sampled the hysteresis loop many times while the Gd heated back up so i have about a hundred samples of Hysteresis loops with temperature varying between -120 celsius and 30 celsius . my...
  6. G

    Hysteresis loop magnetization of Gadolinium

    hello i have a few questions regarding hysteresis loop in ferromagnets as showen here . i had an experiment in which i took a piece of gadolinium and cooled it down using liquid nitrogen , than i put it in an apparatus as showen here , so i induct an oscillating magnetic field on it , forcing...
  7. G

    Random walk - why is the STD equal sqrt(n)

    o.k so i figured it out by myself , sor anyone who might stumble upon this confusion i will explain : so sn ≠ nxi but actually sn = ∑ni=1 xi so E(sn) = E(x1) +...+ E(xn) = 0 and Var(sn) = Var(x1) +...Var(xn) = n ⇒σsn= √n my mistake was for doing sn = nxi when actually it is sn = ∑ni=1 which is...
  8. G

    Random walk - why is the STD equal sqrt(n)

    are you sure you are capable to assist me ? i think you might not know what an indicator random variable is and thus you confuse me and might cause actual damage , even though I'm sure your intentions are good
  9. G

    Random walk - why is the STD equal sqrt(n)

    yes but how do you show that σ=√n
  10. G

    Random walk - why is the STD equal sqrt(n)

    could you elaborate further?
  11. G

    Random walk - why is the STD equal sqrt(n)

    typical random walk : one step forward or backward with equal probability and independence of each step , what is the expectation and Variance . so i define indicator variable xi ={1 or -1 with equal probability . E(xi) = 0 Var(xi) = 1 now define Sn as the sum of i=1,...,n each step is...