Search Results - Wells, D.B
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Optical switching of 1-D microstrip photonic bandgap structures
Published 2002“…Under illumination the experimental results display an increase in S21 of 6.5dB and a reduction in S11 of more than 8dB at the centre frequency of 10GHz. …”
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Differential encoding techniques applied to speech signals
Published 1978“…The snr is increased by 6 dB compared with the peak snr of a First Order DPCM codea. …”
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Experimental characterisation and prediction of shielding effectiveness for multilayer carbon fibre reinforced composite materials with varying configurations
Published 2022“…Comparison of the SE profiles showed that quasi-isotropic and cross-ply configurations perform equally well in attenuating the unpolarised radiation and only a modest increase of 10 dB is achieved by doubling the number of plies due to increased absorption. …”
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Novel design methodology for 3D-printed lenses for travelling wave antennas
Published 2023“…The new lens demonstrated a gain enhancement of more than 7 dB compared to less than 4 dB with conventional dielectric lenses. …”
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Dual circularly polarized 3-D printed broadband dielectric reflectarray with a linearly polarized feed
Published 2022“…The measured 3-dB gain bandwidth and aperture efficiency are 30% and up to 38%, respectively. …”
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Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration
Published 2017“…Laser Doppler vibrometers (LDVs) are now well-established as an effective non-contact alternative to traditional contacting transducers. …”
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Restoring high accuracy to laser Doppler vibrometry measurements affected by vibration of beam steering optics
Published 2017“…Laser Doppler vibrometers are now well-established as an effective non-contact alternative to traditional contacting transducers. …”
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Utilisation of edge adaptive upsampling in compression of depth map videos for enhanced free-viewpoint rendering
Published 2009“…Test results show that as much as 1.2 dB gain in free-viewpoint video quality can be achieved with the utilization of the proposed method compared to the scheme that uses the linear MPEG re-sampling filter. …”
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The effect of electrical noise on the spectral purity of oscillators
Published 1975“…The power generated at the fundamental frequency of oscillation lies in a very narrow band, with a 3 dB bandwidth usually much less than 1 Hz for a 100 MHz oscillator. …”
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Correction of laser Doppler vibrometry measurements affected by steering mirror vibration
Published 2016“…The laser Doppler vibrometer (LDV) is now well-established as an effective non-contact alternative to traditional contacting vibration transducers. …”
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Design and parametric analysis of a dual band frequency reconfigurable planar dipole using a dual band artificial ground plane
Published 2014“…Antenna operates in dual-band as well as single-band mode depending on switching combination. …”
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Detection and location of sub-cranial haematomas using mutlifrequency electrical impedance tomograpgy
Published 2023“…This design decreases the effect of stray noise along the long electrode-to-hardware wires resulting in a system with an average voltage magnitude SNR of 60 dB and a voltage phase SNR of 70 dB. The testing system necessitates a biofidelic human head phantom model. …”
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Band gap formation in acoustically resonant phononic crystals
Published 2010“…Good agreement between band gap locations for the investigative methods detailed is found. The well known link between the frequency range a phononic crystal can attenuate sound over and its lattice parameter is confirmed. …”
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Materials and processes to enable polymeric waveguide integration on flexible substrates
Published 2009“…As light signals are propagated and confined through the definition of core-cladding interface, the light guiding structure is required to adhere well and ensure long term interfacial stability. …”
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