Zobrazeno 1 - 10
of 14
pro vyhledávání: '"R. Jeffrey Lytle"'
Autor:
Michael R. Portnoff, R. Jeffrey Lytle
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. :93-98
Seismic probing between boreholes is useful for locating high-contrast geophysical anomalies such as an abandoned tunnel. Theoretical studies of continuous wave (CW) seismic wave interaction with a tunnel show that both the signal minima and the phas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a22b1523fd5f24192c8464bf80326040
https://doi.org/10.1109/tgrs.1984.350599
https://doi.org/10.1109/tgrs.1984.350599
Autor:
R. Jeffrey Lytle, Kris A. Dines
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. :234-240
A computerized method is described for calculating an image of the refractive index distribution in a plane bounded by two underground boreholes. The scanning geometry is assumed to be limited to probing from borehole to borehole, with rays at numero
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ef71e777c5c7db2323ccd4d69f059cd
https://doi.org/10.1109/tgrs.1980.4307496
https://doi.org/10.1109/tgrs.1980.4307496
Publikováno v:
Journal of the Geotechnical Engineering Division. 106:759-766
Electromagnetic probing can be used to assess the integrity of concrete cofferdam seals. Data are taken using high-frequency transmitter and receiver antennas installed in separate boreholes drilled in the concrete seal, and the spatial variation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9214e30b67d8921ae7cf1429d3768ad1
https://doi.org/10.1061/ajgeb6.0001003
https://doi.org/10.1061/ajgeb6.0001003
Autor:
R. Jeffrey Lytle
Publikováno v:
IEEE Transactions on Geoscience Electronics. 12:81-101
An overview of measurement techniques, measurement results, and factors influencing the conductivity and dielectric constant of earth medium is given. Application of these measurement techniques to geophysical investigations is also discussed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93bfe95dd8f89da92873d07981bb352a
https://doi.org/10.1109/tge.1974.294345
https://doi.org/10.1109/tge.1974.294345
Autor:
Darrel L. Lager, R. Jeffrey Lytle
Publikováno v:
Radio Science. 11:465-475
The effect of lateral inhomogeneities on electromagnetic remote probing of layered structures is considered. The excitation is taken to be an incident transverse electric (TE) plane wave. The fields, the surface admittance, and the wave tilt depend u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4e41221a803ea41878e6d3ec039e9c32
https://doi.org/10.1029/rs011i005p00465
https://doi.org/10.1029/rs011i005p00465
Autor:
Darrel L. Lager, R. Jeffrey Lytle
Publikováno v:
Radio Science. 10:905-909
A linear dipole antenna has an impedance matrix of Toeplitz form. The problem of an acoustically long cylindrical antenna in a warm plasma thus becomes numerically tractable. Both the electromagnetic and acoustic wavelengths are evident in the curren
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::387ebbc9a8172cf78adc17001dcfd867
https://doi.org/10.1029/rs010i010p00905
https://doi.org/10.1029/rs010i010p00905
Publikováno v:
IEEE Transactions on Geoscience Electronics. 14:244-249
An overview of the tilt of an electromagnetic surface wave propagating along the surface of the earth is given. High-frequency wave-tilt measurements can have important applications in low conductivity regions such as desert and permafrost areas. A s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bcae2bf36954b0f7e0a986b63043476d
https://doi.org/10.1109/tge.1976.294433
https://doi.org/10.1109/tge.1976.294433
Autor:
R. Jeffrey Lytle
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. :493-499
The mathematical formulae governing the interaction of a low-frequency source of electric current with a spherical anomaly are given. These formulae are used to determine the apparent resistivity and induced-polarization response between electrodes l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::434900bea203be092462872d054fb48b
https://doi.org/10.1109/tgrs.1982.350416
https://doi.org/10.1109/tgrs.1982.350416
Autor:
Darrel L. Lager, R. Jeffrey Lytle
Publikováno v:
Radio Science. 12:249-260
We have applied the data-inversion algorithms developed by investigators in the field of tomography to the problem of determining the structure of the ground between a pair of drill holes. The three most successful algorithms to date have been modifi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19fa14bb45b5bc6810a195fa40c4bed3
https://doi.org/10.1029/rs012i002p00249
https://doi.org/10.1029/rs012i002p00249
Autor:
E.F. Laine, R. Jeffrey Lytle
Publikováno v:
IEEE Transactions on Geoscience Electronics. 16:304-307
In this report we describe a design for a miniaturized directional antenna for use in geophysical exploration from boreholes. Mathematical results are given which indicate the antenna characteristics. The concept we use involves an antenna eccentrica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f12f3f8f20395586c18bce66dcdaa570
https://doi.org/10.1109/tge.1978.294588
https://doi.org/10.1109/tge.1978.294588