Now showing items 1-10 of 18
Properties of Ba(Mg1/3Ta2/3)O-3 thin films prepared by metalorganic solution deposition technique for microwave applications
(AIP Publishing, 1998-08-01)
We report on the properties of Ba(Mg1/3Ta2/3)O-3 thin films prepared by the metalorganic solution deposition technique. Bulk Ba(Mg1/3Ta2/3)O-3 ceramics have shown excellent dielectric properties at microwave frequencies; ...
Poly(tetrafluoro-p-xylylene), a low dielectric constant chemical vapor polymerized polymer
(AIP Publishing, 1998-01-01)
A low dielectric constant polymer, poly(tetrafluoro-p-xylylene) (VT-4) was synthesized by a chemical vapor polymerization process using 4,5,7,8,12,13,15,16-octafluoro-[2.2]-paracyclophane as a precursor. The VT-4 polymer ...
Laser-assisted low temperature processing of Pb(Zr, Ti)O-3 thin film
(AIP Publishing, 1998-10-01)
A method for lowering the processing temperature of PbZr1-xTixO3 films was developed utilizing a laser- assisted two- step process. In the first step, perovskite phase was initiated in the PZT films to a furnace anneal at ...
Infrared activity in the Aurivillius layered ferroelectric SrBi2Ta2O9
(American Physical Society, 1998-03-01)
Experimental studies were carried out on infrared-active phonons in the Aurivillius ferroelectric SrBi2Ta2O9 (SBT), using reflectivity measurements (down to 200 cm(-1)) and transmission measurements (down to 100 cm(-1)) ...
Development of a new standard laboratory protocol for estimating the field attenuation of hearing protection devices. Part III. the validity of using subject-fit data
(Acoustical Society of America, 1998-02-01)
The mandate of ASA Working Group S12/WG11 has been to develop "laboratory and/or field procedure(s) that yield useful estimates of field performance" of hearing protection devices (HPDs). A real-ear attenuation at threshold ...
Investigation of Subcombination Internal Resonances in Cantilever Beams
Activation of subcombination internal resonances in transversely excited cantilever beams is investigated. The effect of geometric and inertia nonlinearities, which are cubic in the governing equation of motion, is considered. ...
Dynamic Response of Cantilevered Thin-Walled Beams to Blast and Sonic-Boom Loadings
Nonlinear Response of Cantilever Beams to Combination and Subcombination Resonances
The nonlinear planar response of cantilever metallic beams to combination parametric and external subcombination resonances is investigated, taking into account the effects of cubic geometric and inertia nonlinearities. ...
Active control of sound radiation from a plate using a polyvinylidene fluoride volume displacement sensor
(Acoustical Society of America, 1998-03-01)
This paper presents a new volume displacement sensor (made of shaped strips of PVDF film) and the experimental implementation of this sensor in an active control system. A design strategy for a PVDF sensor detecting the ...
Comparison of two structural sensing approaches for active structural acoustic control
(Acoustical Society of America, 1998-01-01)
A numerical study comparing the use of two structural sensing approaches for sound radiation control is performed on a baffled rectangular plate. The first sensing approach implements an array of accelerometers whose outputs ...