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pro vyhledávání: '"R. O. Hansen"'
The space H of asymptotically (left-) shear-free cuts of the J + (good cuts) of an asymptotically flat space-time M is defined. The connection between this space and the asymptotic projective twistor space PJ of M is discussed, and this relation is u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a81bda06c2c1e5fcbdf87fc3e00fe04
https://ora.ox.ac.uk/objects/uuid:7249430e-6adc-429d-af04-8d5d1d933e38
https://ora.ox.ac.uk/objects/uuid:7249430e-6adc-429d-af04-8d5d1d933e38
Publikováno v:
Near Surface Geophysics. 6:113-122
The magnetic difference, the quantity measured by magnetic gradiometers, is considered to be the convolution between a function that controls the anomaly pattern and another that controls the strength signal. These are called shape and amplitude func
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba8e01c137d189cf8f4d50c62b16c413
https://doi.org/10.3997/1873-0604.2007037
https://doi.org/10.3997/1873-0604.2007037
Publikováno v:
Exploration Geophysics. 38:111-119
Potential-field anomalies can be transformed into special functions that form peaks and ridges over isolated sources. All special functions have a common mathematical form over an isolated source, which leads to a common equation for estimating the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dabf3c0e755987e376ea4b27c2cabe00
https://doi.org/10.1071/eg07014
https://doi.org/10.1071/eg07014
Autor:
Eduard deRidder, R. O. Hansen
Publikováno v:
GEOPHYSICS. 71:L61-L67
This paper presents a new approach to detecting and two approaches to displaying lineaments associated with high-angle magnetic contacts, based on analysis of the curvature of the total horizontal gradient of the total magnetic field reduced to the p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d975fde1ec95d8c9aa43a600089c9c9
https://doi.org/10.1190/1.2357831
https://doi.org/10.1190/1.2357831
Autor:
V.J.S. Grauch, R. O. Hansen, Jeffrey D. Phillips, Yaoguo Li, Misac N. Nabighian, J. W. Peirce, M. E. Ruder, Thomas R. LaFehr
Publikováno v:
GEOPHYSICS. 70:33ND-61ND
The magnetic method, perhaps the oldest of geophysical exploration techniques, blossomed after the advent of airborne surveys in World War II. With improvements in instrumentation, navigation, and platform compensation, it is now possible to map the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5eb088920272b413cba2a01df4d188d2
https://doi.org/10.1190/1.2133784
https://doi.org/10.1190/1.2133784
Autor:
R. O. Hansen, M. E. Ruder, W. C. Pearson, Misac N. Nabighian, Jeffrey D. Phillips, V.J.S. Grauch, T. R. LaFehr, Yaoguo Li, J. W. Peirce, Mark E. Ander
Publikováno v:
GEOPHYSICS. 70:63ND-89ND
The gravity method was the first geophysical technique to be used in oil and gas exploration. Despite being eclipsed by seismology, it has continued to be an important and sometimes crucial constraint in a number of exploration areas. In oil explorat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64d8c97bd020715110318645bfd1cebd
https://doi.org/10.1190/1.2133785
https://doi.org/10.1190/1.2133785
Autor:
R. O. Hansen
Publikováno v:
GEOPHYSICS. 70:L45-L51
Werner deconvolution has been widely used for at least 30 years for rapid interpretation of magnetic data. Since 1993, a multiple-source generalization of the method has been known, and at least two implementations of the algorithm are in use. Recent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::70f88b26b1a15a18ea2de3dc4b88a27c
https://doi.org/10.1190/1.2073883
https://doi.org/10.1190/1.2073883
Autor:
Laura Suciu, R. O. Hansen
Publikováno v:
GEOPHYSICS. 67:525-535
Rapid three-dimensional (3-D) source location methods can be extremely useful in framing a subsurface structural model from gravity or magnetic data. However, existing implementations of Euler deconvolution are limited to a single source in each wind
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bfed604b0ea88c6171a21c17afc52038
https://doi.org/10.1190/1.1468613
https://doi.org/10.1190/1.1468613
Publikováno v:
GEOPHYSICS. 66:501-510
As part of a research program to develop gravity interpretation tools that can be merged with seismic techniques, a full 3-D complex structural inversion scheme for (possibly multibody) polyhedral models has been developed. The forward modeling algor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdf784bb3142f1aab57bc834b4b7359e
https://doi.org/10.1190/1.1444940
https://doi.org/10.1190/1.1444940
Publikováno v:
Journal of Environmental and Engineering Geophysics. 6:33-46
The dominant cost and time driver in unexploded ordnance (UXO) cleanup is the necessity of digging (excavating) “false alarm” gèophysical anomalies. As many as 75% of all the anomalies investigated are false alarms, e.g., scrap metal, ordnance d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62722cf11ad243fc44c3f376be57ae17
https://doi.org/10.4133/jeeg6.1.33
https://doi.org/10.4133/jeeg6.1.33