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A possible method of monitoring bone fracture and bone
characteristics using a noninvasive acoustic technique Ryder, D.M. King, S.L. Oliff, C.J. Davies, E.
Page(s): 159 - 163
Abstract | Full Text: PDF (204KB)

This paper presents results from a feasibility study to explore
the possibility of designing a simple noninvasive instrument to detect
and monitor changes in bone characteristics in vivo. An acoustic method
is used in which a gentle controllable impact produces acoustic waves
which travel through the flesh and into the bone. An accelerometer is
used, close to the impact area and an amplitude/frequency response is
processed and recorded. By applying this procedure to parts of the body,
and compar... Read More »
Information extraction from ultrasound signals in inhomogeneously
predeformed viscoelastic media Ravasoo, A.
Page(s): 153 - 158
Abstract | Full Text: PDF (332KB)

The propagation of ultrasound signals in nonlinear viscoelastic
media undergoing plane inhomogeneous predeformation is investigated
theoretically. The main aim of this investigation is (i) to derive the
mathematical algorithm that describes the dependence of wave
characteristics on the parameters of the media and predeformation and
(ii) to propose the method of information extraction from the wave
propagation data Read More »
Artificial neural nets to detect lines in noise Leeming,Windows 7 Home Premium Product Key, N.
Page(s): 147 - 152
Abstract | Full Text: PDF (412KB)

This work discusses some investigations on the detection of lines
in noise. The motivation comes from the effort being put into naval
sonars to detect sources of decreasing signal strength. This has as a
consequence an increase in the total information acquired by the
detection process. The information needs assessing and sorting in real
time, with much of it being discarded. To do this with current methods
would require more operators but these are too expensive to be used in
the numbers needed... Read More »
The performances of the bidirectional associative memory in noise-corrupted character recognition Lazarescu, V. Dumitras, A.
Page(s): 142 - 146
Abstract | Full Text: PDF (248KB)
3D Sonargraphics-a seabed survey tool Ingram, R.
Page(s): 135 - 141
Abstract | Full Text: PDF (340KB)

The Sonargraphics system developed by British Gas is a small scale
three dimensional (3D) motion compensated subsea surveying tool. It is a
modular design allowing it to be configured for a number of applications
and deployment methods. It is particularly useful in areas of poor
visibility such as the Morecambe Bay gas fields in the Irish Sea. This
paper describes the principle of operation, the computer programmes used
to operate the system and some examples of how it has been used in
practice Read More »
The generation of acoustic pulses for auditory localisation
experiments Haigh, D.J.
Page(s): 129 - 134
Abstract | Full Text: PDF (232KB)

In order to obtain pulse response measurements a source of high
quality acoustic pulses is required. This paper describes a method by
which very high quality acoustic pulses can be produced simply, and at
moderate cost. The pulses are suitable for measuring the temporal
responses of acoustic systems operating to the limits of the human
auditory bandwidth. The particular application for which the work was
performed is in the field of auditory localisation,Office 2010 Pro Plus Key, and in particular
the role of the pinnae... Read More »
Higher order interpolation techniques German, I.
Page(s): 126 - 128
Abstract | Full Text: PDF (136KB)

The kernel of the fifth order convolution interpolation has been
calculated in such a way that permits higher order calculations.
Comparison of the accuracies of different orders are given for some
specific cases Read More »
An acoustic method to evaluate cement quality in an oil well Gai, H. Lockyear,Office Professional 2010 Key, C.F.
Page(s): 120 - 125
Abstract | Full Text: PDF (344KB)

The authors present a brief introduction to the construction and
principle of the Cement Bond Log Tool. A model of wave propagation and
attenuation by the cement in the annulus is then given, and the Bond
Percentage Index (BPI) interpretation method is introduced. After some
historical errors are analysed, experiments and comparison results for
both BPI and the traditional method are described. The limitations of
the tool are also discussed. The conclusions are that the analysis,
supported by ex... Read More »
A complex frequency approach towards pulse-echo attenuation
estimation Healey, A.J. Leeman, S. Betts, M. Newman, D.
Page(s): 114 - 119
Abstract | Full Text: PDF (344KB)

This paper introduces a novel technique for substantially
correcting the influence of interference effects on attenuation
estimates from backscattered rf A-line data. The technique is grounded
in the approach of regarding pulse-echo attenuation as a pulse
estimation problem. The procedures operate via the manipulation of
features (zeros) intimately associated with those interference effects
which affect mean frequency, and attempt to reduce the influence of the
`structure' component of a signal ... Read More »
A synthetic aperture sonar image processing system Adams, A.E. Hinton, O.R. Lawlor, M.A. Sharif, B.S. Riyait, V.S.
Page(s): 109 - 113
Abstract | Full Text: PDF (212KB)

Synthetic aperture techniques are well established in radar
systems but are, however,Office Ultimate 2007, relatively novel in sonar systems. The
advantages gained from the use of a synthetic aperture, i.e., the
resolution potential of a long array with the convenience of use of a
small array system, still apply for sonar usage, and the much lower
frequencies involved compared to radar systems would seem to indicate
that the application of this technique to the sub-sea environment would
be a relatively straight forw... Read More »


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