Electrochemical impedance spectroscopy and gravimetric methods were carried out to analyze water uptake of thin polyurethane films separately filled with either hydrophobic or hydrophilic nano-silica. Correspondingly the impedance spectra and gravimetric data were interpreted in terms of movement of water within the coating and/or to the coating/metal interface. Although the obtained results fr...

SalmonellaTyphimurium is one of the most dangerous foodborne pathogens and poses a significant threat to human health. The objective of this study was to develop a portable impedance immunosensing system for rapid and sensitive detection of S. Typhimurium in poultry. The developed portable impedance immunosensing system consisted of a gold interdigitated array microelectrode (IDAM), a signal ac...

This paper presents an algorithm which couples the time domain Boundary Element Method (BEM) with a digital filter surface model. This aims to achieve the same for transient sounds as is possible for time-harmonic excitation using surface impedance and the frequency domain BEM. Accurate representation of surface properties is crucial in obtaining realistic simulations, and the obstacles and bou...

In electrical impedance tomography (EIT), a small alternating current is injected into the patient and the resulting voltages are measured at the body surface. From this, images are reconstructed that can be used for ventilation and cardiac monitoring. In modern EIT systems and in prototypes, the frequency of the injected current can be varied in a range between typically 50 kHz and 250 kHz. In...

We study transport and di usion of classical waves in two-dimensional disordered systems and in particular surface waves on a at surface with randomly uctuating impedance. We derive from rst principles a radiative transport equation for the angularly resolved energy density of the surface waves. This equation accounts for multiple scattering of surface waves as well as for their decay because o...

High dv/dt conditions in low impedance circuits using surface mount tantalum capacitors is discussed. Circuit designs utilizing low R(DS)ON MOSFETs for preventing these conditions are presented in detail. TECHNICAL INFORMATION INCREASING RELIABILITY OF SMD TANTALUM CAPACITORS IN LOW IMPEDANCE APPLICATIONS by David Mattingly Application