Now showing items 1-4 of 4

    • coupling constant thresholds of perturbed periodic Hamiltonians 

      Fassari, S.; Klaus, M. (AIP Publishing, 1998-09)
      We consider Schrodinger operators of the form H-lambda= -Delta + V + lambda W on L-2(R-v) (v=1, 2, or 3) with V periodic, W short range, and lambda a real non-negative parameter. Then the continuous spectrum of H-lambda ...
    • inverse wave scattering with discontinuous wave speed 

      Aktosun, T.; Klaus, M.; Vandermee, C. (AIP Publishing, 1995-06)
      The inverse scattering problem on the line is studied for the generalized Schrödinger equation (d 2ψ/dx 2)+k 2 H(x)2ψ=Q(x)ψ, where H(x) is a positive, piecewise continuous function with positive limits H ± as x → ±∞. This ...
    • Small-energy analysis for the self-adjoint matrix Schrodinger operator on the half line 

      Aktosun, Tuncay; Klaus, Martin; Weder, Ricardo (AIP Publishing, 2011-10)
      The matrix Schrodinger equation with a self-adjoint matrix potential is considered on the half line with the most general self-adjoint boundary condition at the origin. When the matrix potential is integrable and has a ...
    • The effect of negative feedback loops on the dynamics of Boolean networks 

      Sontag, Eduardo; Veliz-Cuba, Alan; Laubenbacher, Reinhard; Jarrah, Abdul Salam (CELL PRESS, 2008-07)
      Feedback loops play an important role in determining the dynamics of biological networks. To study the role of negative feedback loops, this article introduces the notion of distance-to-positive-feedback which, in essence, ...