Search Results - Wells, D.B

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  1. 1

    Optical switching of 1-D microstrip photonic bandgap structures by Darren Cadman, Robert E. Miles, Robert W. Kelsall, David Hayes

    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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  2. 2

    Differential encoding techniques applied to speech signals by Constantinos S. Xydeas

    Published 1978
    “…The snr is increased by 6 dB compared with the peak snr of a First Order DPCM codea. …”
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  3. 3

    Experimental characterisation and prediction of shielding effectiveness for multilayer carbon fibre reinforced composite materials with varying configurations by Ewa Mikinka, M Siwak

    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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  4. 4

    Novel design methodology for 3D-printed lenses for travelling wave antennas by Aakash Bansal, Chinthana Panagamuwa, William Whittow

    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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  5. 5

    Dual circularly polarized 3-D printed broadband dielectric reflectarray with a linearly polarized feed by Qiao Cheng, Yang Hao, Jack McGhee, William Whittow, J. C. Vardaxoglou, Raj Mittra, Shiyu Zhang

    Published 2022
    “…The measured 3-dB gain bandwidth and aperture efficiency are 30% and up to 38%, respectively. …”
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  6. 6

    Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration by Ben Halkon, Steve Rothberg

    Published 2017
    “…Laser Doppler vibrometers (LDVs) are now well-established as an effective non-contact alternative to traditional contacting transducers. …”
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  7. 7

    Restoring high accuracy to laser Doppler vibrometry measurements affected by vibration of beam steering optics by Ben Halkon, Steve Rothberg

    Published 2017
    “…Laser Doppler vibrometers are now well-established as an effective non-contact alternative to traditional contacting transducers. …”
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  8. 8

    Utilisation of edge adaptive upsampling in compression of depth map videos for enhanced free-viewpoint rendering by Erhan Ekmekcioglu, Marta Mrak, Stewart T. Worrall, Ahmet Kondoz

    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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  9. 9

    The effect of electrical noise on the spectral purity of oscillators by Michael J. Mead

    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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  10. 10

    Correction of laser Doppler vibrometry measurements affected by steering mirror vibration by Ben Halkon, Steve Rothberg

    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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  11. 11

    Design and parametric analysis of a dual band frequency reconfigurable planar dipole using a dual band artificial ground plane by Adeel Afridi, Sadiq Ullah, Imad Ali, Shabaz Khan, James Flint

    Published 2014
    “…Antenna operates in dual-band as well as single-band mode depending on switching combination. …”
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  12. 12

    Detection and location of sub-cranial haematomas using mutlifrequency electrical impedance tomograpgy by Toby Williams

    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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  13. 13

    Band gap formation in acoustically resonant phononic crystals by Daniel P. Elford

    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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  14. 14

    Materials and processes to enable polymeric waveguide integration on flexible substrates by Tze Yang Hin

    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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