The effect of frequency content on the dynamic response of concrete gravity dams is investigated in this paper. Dams are one of the most complex structures to handle when there is dynamic analysis involved. One of the influential parameters on these structureschr('39') seismic response is the frequency content of the earthquakes. An index to represent frequency content, which represents frequen...

background: the airway surface liquid (asl), which is a fluid layer coating the interior epithelial surface of the bronchi and bronchiolesis, plays an important defensive role against foreign particles and chemicals entering lungs. objective: numerical investigation has been employed to solve two-layer model consisting of mucus layer as a viscoelastic fluid and periciliary liquid layer as a newt...

Abstract The dual-frequency ratio of radar reflectivity factors (DFR) has been shown to be a useful quantity as it is independent the number concentration particle size distribution and primarily function mass-weighted diameter D m . A drawback DFR-related methods for rain estimation, however, nonunique relationship between DFR. At Ku- Ka-band frequencies, two solutions exist when DFR less than...

This paper presents a compact quadrature coupler with tunable frequency and power-dividing ratio. Wide ratio are achieved by using the novel unit instead of transmission line sections in traditional varactor-based coupler. Closed-form equations derived for design parameters. For verification, is designed based on given parameters, which demonstrate 2.0 GHz to 6.0 -20 dB 7.2 at 3 GHz. Finally, m...