Recent content by Boudy

  1. Boudy

    I Need Aproximate expressions for : ln(x) and 1/ln(x) Thanks

    Hi there: I am looking for approximate expressions for the two functions: ln(x) and 1/ln(x) . Any help? Thanks in advance.
  2. Boudy

    A Linear Systems

    In order to find the Impulse response , f(t), you need only the real part , R(ω),of the transfer function F(j ω). According to the mentioned paper: f(t)= (2/π).∫R(ω).cos(tω) dω The limits of integration are from zero to infinity. Best regards
  3. Boudy

    A Linear Systems

    Dear friends: Thanks for your kind comments. In the meantime I could find a direct straightforward answer in the 1959 publication: SIMPLIFED METHOD OF DETERMINING TRANSIENT RESPONSE FROM FREQUENCY RESPONSE OF LINEAR NETWORKS AND SYSTEMS By: Victor S . Levadi Thanks again. Boudy
  4. Boudy

    A Linear Systems

    The transfer function of a linear system is known in the sinusoidal frequency domain. It is given in its final form as a complex function of the angular frequency ω (not jω ). How to obtain the step response? Thanks in advance.
  5. Boudy

    A Solving two simultaneous integro-differential equations

    I thank both friends for their kind help. Fortunately, and after some modifications in the equations, a solution was possible using the numerical solution of two simultaneous differential equations in two variables and one single independent variable. This was done using the NDSolve command...
  6. Boudy

    What software do you use in your field of study?

    1. I am using (Mathematica) since eary 1990's. I went through all its versions from (Mathematica 5. to (Mathematica 11). It helped my alot specially when dealing with calculus and graphic illustrations. 2. I use (Miceosoft Word) and (PowerPoint). 3. My current Browser is (Maxthon...
  7. Boudy

    A Solving two simultaneous integro-differential equations

    I am trying to find a closed-form (analytical) solution for the two following simultaneous integro-differential equations : du[x]/dx= - a v[x] +b ∫〖[1-(y-x)^4 〗].(v[y]-v[x])dy And (dv[x])/dx= - f u[x] -g ∫〖[1-(y-x)^4 〗].u[y]dy With the initial conditions: v[0]=e and u[1]=0 a,b,f,g...
Top