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Gelation during solution free radical crosslinking copolymerization (FCC) of methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDM) was studied by using the steady state fluorescence technqiue. FCC was performed in the presence of toluence at 75°C. Sol-gel transitions were monitored by observing the direct intensity of an excited pyrene (Py) during in situ fluorescence experiments for...
Pyranine (8-hydroxypyrene-1, 3,6-trisulfonic acid, trisodium salt) was used as a floroprobe for monitoring the solution free-radical cross-linking polymerization of acrylamide (AAm) to test the universality class of the sol–gel transition. The spectra of the pyranines shift to shorter wavelengths during the polymerization of AAm. The intensity of the shifted spectra monitors the sol–gel transition,...
Pyranine (8-hydroxypyrene-1, 3,6-trisulfonic acid, trisodium salt) was used as a floroprobe for monitoring the solution free-radical cross-linking polymerization of acrylamide (AAm) to test the universality class of the sol–gel transition. The spectra of the pyranines shift to shorter wavelengths during the polymerization of AAm. The intensity of the shifted spectra monitors the sol–gel transition,...
Active control of a flexible beam is investigated using time-delayed piezoelectric actuator. A minimization problem is formulated that consists of finding the control voltage applied to a piezoelectric patch actuator which suppresses the dynamic responses of the beam at a specified terminal time with least control effort. The solution method is based on a combination of modal expansion and direct...
We consider sequential nonlinear prediction of a bounded, real-valued and deterministic signal from its noise-corrupted past samples in a competitive algorithm framework. We introduce a randomized algorithm based on context-trees [1]. The introduced algorithm asymptotically achieves the performance of the best piecewise affine model that can both select the best partition of the past observations...
The Krylov proportionate normalized least mean square (KPNLMS) algorithm extended the use of proportional update idea of the PNLMS (proportionate normalized LMS) algorithm to the non-sparse (dispersive) systems. This paper deals with the mean fourth minimization of the error and proposes Krylov proportionate normalized least mean fourth algorithm (KPNLMF). First, the PNLMF (proportionate NLMF) algorithm...
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