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- Volume 16, Issue 6, 1998
First Break - Volume 16, Issue 6, 1998
Volume 16, Issue 6, 1998
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Now and then: after 25 years is history repeating itself in the UK offshore oil industry?
By A. McBarnetIn 1973 the UK government published the first Brown Book on the state of the then new UK offshore oil industry. At that time, oil companies were anxious about the fiscal regime likely to be adopted by the government and oil price levels were a concern. Andrew McBarnet reviews the parallels with today.
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Automatic detection of hyperbolas in georadargrams by slant-stack processing and migration
Authors U. Papziner and K-P. NickGround penetration radar (GPR) is an important tool in geophysical prospecting to examine the structure of the subsurface and to locate objects in the ground at shallow depths. For analysis and interpretation of GPR data, considerable experience is needed. The analysis is time-consuming and expensive for the examination of large areas, preventing more widespread use of georadar. Therefore, automatic data processing and interpretation are the obvious choice for effective application of georadar in civil engineering. The important task in this context is the detection of man-made objects in the ground such as pipes, cables, barrels and ducts. GPR data are commonly composed of bed reflections, diffraction hyperbolas from small objects, and noise. Data processing can be improved by separating these components, and for this purpose slant stack and migration offer important advantages. These algorithms focus specific data components, while simultaneously dispersing the remaining features. To separate data components, invertible transforms are needed. The slant stack focuses linear bed reflections (Gardner & Lu 1991), which enables them to be separated from diffractions and noise. The detection and extraction of the diffractions can be performed by migration, which focuses the hyperbolas. This operation requires a correct estimate of the speed of wave propagation in the ground. This method was proposed by Harlan et al. (1984) for application to seismic data and was also succesfully applied by Meldahl (1993). However, their iterative algorithm requires a lot of computation. For implementation on GPR data, a more practical direct method is needed which could be executed on a personal computer.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)