Engineering Commons^™

Scanning Electrochemical Mass Sensitivity Mapping Of The Quartz Crystal Microbalance In Liquid Media, Andrew C. Hillier, M. D. Ward

Andrew C. Hillier

The mass sensitivity distribution of the quartz crystal microbalance, denoted S(r,8), was determined in situ for pianopiano and plano-convex Aleut quartz resonators. The method involved measuring the frequency change associated with localized mass deposits created by electrochemical deposition using a scanning microelectrode in close proximity to the QCM eiectroded surface. Complete mathematical descriptions of S(r,8) were obtained from the measured data under conditions commonly encountered in QCM experiments. Our experimental resuits suggest that crystal contouring increases sensitivity toward the resonator center while reducing the extent of field fringing. Increaslng solution viscosity reduces the sensitivity to mass changes in the center …

Nuclear Emp Hardening Approach As The Basis For Unified Electromagnetic Environmental Effects Protection, George H. Baker Iii

George H Baker

Operation DESERT STORM demonstrated the clear military advantage that was provided by our sophisticated electronic C4I and weapons systems. High tech means so dominate the battlefield that the outcome of future conflicts could be decided by electronics attrition rather than human casualties. However, the electromagnetic threat landscape is highly complex. The already formidable list of environments (EMI, lighting, ESD, EMP, HERO, TEMPEST, EW, etc.) is lengthened by emerging threats from high power microwave (HPM) and ultra-wide band (UWB) electromagnetic weapons. Many of these environments overlap in the frequency and amplitude of the electrical stresses they create.

The large number of …