Vibrating Air Column of High Frequency

Electrothermal Frequency Tuning of Folded and Coupled Vibrating Micromechanical Resonators

The use of constrained thermal expansion to tune the resonant frequency of vibrating micromechanical resonators is explored. A simple model is developed to predict the power sensitivity obtained with folded and unfolded geometries, including the effects of electrothermal heating, and conduction and convection cooling. It is shown that the sensitivity of folded structures can change sign as the ...

robust control of a high-purity disttilation column using synthesis

Localization of Vibrating Targets Using Dual-Frequency Synthetic Aperture Radar and Time-Frequency Analysis

An important task in urban sensing applications is to accurately localize moving and vibrating targets in the presence of significant background clutter. A dual-frequency radar, which estimates the range of a target based on the phase difference between two closely spaced frequencies, has been shown to be a cost-effective approach for range estimation of a moving target. Previous work has shown...

Performance of Air Foam Flooding under Low Frequency Vibration

Foam injection is widely applied in amounts of fields to drilling, production, and formation protection. Sometimes, the application result is disappointing, which is caused by the failure of bubble generation in foam flooding. Therefore, it is necessary to seek ways for improving the performance of foam injection. An increased disturbance to the stratum, like the vibration caused by a seismic o...

Column Generation for Frequency Assignment in Slow Frequency Hopping Networks

This article deals with the frequency assignment problem (FAP) in slow frequency hopping (GSM) networks, a generalization of the classical FAP. Due to symmetry in the solutions, a natural integer linear programming formulation does not yield a good solution procedure. Instead, we decompose the co-channel and adjacent channel interference minimization and develop a two-stage algorithm. The co-ch...