We consider the wave equations with perturbation of the first order differential operators, the coefficients of which depend on both the space and time variables. Under suitable conditions on the ...

Transactions of the American Mathematical Society, Vol. 352, No. 8 (Aug., 2000), pp. 3799-3820 (22 pages) Let H be a generalized N body Schrodinger operator with very short range potentials. Using ...

There has long been a mystery when calculating how an incoming light wave scatters off an object and becomes a modified, outgoing light wave. In particular, the time delay of the transition from one ...

Dynamic Light Scattering (DLS), also known as Quasi-Elastic Light Scattering (QELS) or Photon Correlation Spectroscopy (PCS), is a widely applied method to measure the size of particles dispersed in a ...