69 research outputs found
Micro-Machined High-Frequency (80 MHz) PZT Thick Film Linear Arrays
Abstract This paper presents the development of a micro-machined high-frequency linear array using PZT piezoelectric thick films. The linear array has 32 elements with an element width of 24 μm and an element length of 4 mm. Array elements were fabricated by deep reactive ion etching of PZT thick films, which were prepared from spin-coating of PZT solgel composite. Detailed fabrication processes, especially PZT thick film etching conditions and a novel transferring-and-etching method, are presented and discussed. Array designs were evaluated by simulation. Experimental measurements show that the array had a center frequency of 80 MHz and a fractional bandwidth (−6 dB) of 60%. An insertion loss of −41 dB and adjacent element crosstalk of −21 dB were found at the center frequency
Privatisation and regulation Some comments on the UK experience
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The performance of BAA under privatisation and regulation
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Principles of regulation and the case of social housing
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Caveat emptor at privatisation? Reflections on the regulatory contract in the UK
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Competition in the British rail industry
SIGLEAvailable from British Library Document Supply Centre-DSC:7349.900(6) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Competition in regulated industries
SIGLEAvailable from British Library Document Supply Centre-DSC:7349.900(7) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Changing the structure of rail access charges
SIGLEAvailable from British Library Document Supply Centre-DSC:3597.1241(18) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
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