Viscoelastic dilatation processes of fluid/fluid interfaces: time-domain representation

Time-Domain Representation of Speech

Motivation: The uncertainty principle [2] says that using linear systems we cannot extract precise frequency and timing information from a signal simultaneously. Due to this principle sound processing techniques using versions of the Fourier transform [1] have extreme difficulty trying to approximate human hearing capabilities. Well known problem areas in speech recognition are ones in which th...

Time-domain passivity control of haptic interfaces

A patent pending, energy based, method is presented for controlling a haptic interface system to ensure stable contact under a wide variety of operating conditions. System stability is analyzed in terms of the time domain definition of passivity. We define a "Passivity Observer" (PO) which measures energy flow in and out of one or more subsystems in real-time software. Active behavior is indica...

EE 424 #2: Time-domain Representation of Discrete-time Signals

Stabilizing electrochemical interfaces in viscoelastic liquid electrolytes

Electrodeposition is a widely practiced method for creating metal, colloidal, and polymer coatings on conductive substrates. In the Newtonian liquid electrolytes typically used, the process is fundamentally unstable. The underlying instabilities have been linked to failure of microcircuits, dendrite formation on battery electrodes, and overlimiting conductance in ion-selective membranes. We rep...

Time dependent finite element analysis of the linear stability of viscoelastic flows with interfaces

In this paper we present a new time marching scheme for the time dependent simulation of viscoelastic flows governed by constitutive equations of differential form. Based on the ideas of Carvalho and Scriven [J. Comput. Phys. 151 (1999) 534], a domain perturbation technique is introduced that can be applied to viscoelastic flows with fluid/fluid interfaces or free surfaces. This work mainly foc...