A closed-form, two-dimensional analytical solution is developed to investigate the acoustic performance of a concentric circular Helmholtz resonator lined with fibrous material. The effect of density and the thickness of the fibrous material in the cavity is examined on the resonance frequency and the transmission loss. With the expressions for the eigenvalue and eigenfunction in the cavity, th...

We present the numerical analysis of a Helmholtz resonator-based He analog of the rf-SQUID. This device has been demonstrated to act as a sensitive gyrometer. The rotation is detected by its effect on the apparent critical velocity of helium superflow through a small aperture. To increase the sensitivity, one must enlarge the sensing loops and use higher excitation frequencies. The behavior of ...

We report our preliminary findings on the use of a split-ring (I) or loop-gap resonator in electron spin echo (ESE) spectroscopy at 9 GHz. The loop-gap (LG) resonator of Froncisz and Hyde (2) was reported to have several features which could make it more advantageous than the overcoupled (3) TEro2 microwave cavity traditionally used in ESE experiments (4). Among these are the large uniform micr...

This paper deals with the design and fabrication of a quartz-crystal resonator used in a thickness-monitor unit, measuring film thickness in a film-depositing system. A purpose-grown quartz crystal is cut to form the desired wafer. Two gold electrodes are deposited on both surfaces of the wafer to provide electrical contacts. The resonance frequency of the resonator, at room temperature, and th...

In this paper the vibration signature of single walled carbon nano tube (SWCNT) with waviness along its axis which is doubly clamped at a source and a drain and is used to represent a single mode resonator has been analyzed. In most of previous study, experimentally measured resonance frequencies of CNTs along with classical beam theory for straight beams CNT have used. However, from photo micr...

The primary objective is to obtain experimental measurements of the plane wave reflection coefficients from laboratory and in situ sediments using impedance tube [1] and acoustic resonator tube [2, 3] methods, in the frequency range of approximately 300 Hz to tens of kHz. This approach will also yield measurements of the acoustic impedance, sediment sound speed, attenuation, and complex density...