Properties for Sale, Rent or Lease in fdfd Nigeria

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Agent:Uzair Raees
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Agent:Uzair Raees

A little bit about fdfd, Nigeria

The finite-difference frequency-domain FDFD method is a numerical solution method for problems usually in electromagnetism and sometimes in acoustics, based on finite-difference approximations of the derivative operators in the differential equation being solved. While "FDFD" is a generic term describing all frequency-domain finite-difference methods, the title seems to mostly describe the method as applied to scattering problems The method shares many similarities to the finite-difference time-domain FDTD method, so much of the literature on FDTD can be directly applied The method works by transforming Maxwell's equations or other partial differential equation for sources and fields at a constant frequency into matrix form A x = b {\displaystyle Ax=b} .

The matrix A is derived from the wave equation operator, the column vector x contains the field components, and the column vector b describes the source The method is capable of incorporating anisotropic materials, but off-diagonal components of the tensor require special treatment. Strictly speaking, there are at least two categories of "frequency-domain" problems in electromagnetism One is to find the response to a current density J with a constant frequency ω, i.e .

of the form J x e i ω t {\displaystyle \mathbf {J} \mathbf {x} e^{i\omega t}} , or a similar time-harmonic source This frequency-domain response problem leads to an A x = b {\displaystyle Ax=b} system of linear equations as described above An early description of a frequency-domain response FDTD method to solve scattering problems was published by Christ and Hartnagel 1987 .

Another is to find the normal modes of a structure e.g a waveguide in the absence of sources: in this case the frequency ω is itself a variable, and one obtains an eigenproblem A x = λ x {\displaystyle Ax=\lambda x} usually, the eigenvalue λ is ω2 An early description of an FDTD method to solve electromagnetic eigenproblems was published by Albani and Bernardi 1974. .

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