LambertWMethod to Solve for the Apparent Con-Ductivity and Apparent Dielectric Constant Si-Multaneously in Electromagnetic Well-Logging

2000 ◽  
Vol 43 (3) ◽  
pp. 459-464 ◽  
Author(s):  
Guo-Qiang LIU ◽  
Wei YANG ◽  
Guo TAO ◽  
Qi-Ning FENG ◽  
Rong-Fa LI
Keyword(s):  
Dielectric Constant ◽  
Well Logging ◽  
Apparent Dielectric Constant

scholarly journals Protein Apparent Dielectric Constant and Its Temperature Dependence from Remote Chemical Shift Effects

2014 ◽  
Vol 136 (37) ◽  
pp. 12816-12819 ◽  
Author(s):  
Liaoyuan An ◽  
Yefei Wang ◽  
Ning Zhang ◽  
Shihai Yan ◽  
Ad Bax ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Chemical Shift ◽  
Temperature Dependence ◽  
Apparent Dielectric Constant

THE TEMPERATURE DEPENDENCE OF APPARENT DIELECTRIC CONSTANTS OF ADSORBATES ON NON-POROUS TITANIUM DIOXIDE

1957 ◽  
Vol 35 (12) ◽  
pp. 1534-1541 ◽  
Author(s):  
S. E. Petrie ◽  
R. McIntosh ◽  
E. W. Channen
Keyword(s):  
Dielectric Constant ◽  
Titanium Dioxide ◽  
Temperature Dependence ◽  
Experimental Error ◽  
Adsorption Process ◽  
Porous Titanium ◽  
Dielectric Constants ◽  
Effect Of Temperature ◽  
Apparent Dielectric Constant

The temperature dependence of the apparent dielectric constants of various adsorbed polar gases on finely divided, non-porous titanium dioxide has been determined. Within the experimental error, the apparent dielectric constant of the material adsorbed in the monolayer is independent of temperature. The effect of temperature on the dielectric constant for gas adsorbed beyond the monolayer depends on the adsorbate. These results have been interpreted as indicating that molecules initially adsorbed are oscillators, while those adsorbed in later stages of the adsorption process may be rotators or oscillators.

scholarly journals High Apparent Dielectric Constant Inside a Protein Reflects Structural Reorganization Coupled to the Ionization of an Internal Asp

2007 ◽  
Vol 92 (6) ◽  
pp. 2041-2053 ◽  
Author(s):  
Daniel A. Karp ◽  
Apostolos G. Gittis ◽  
Mary R. Stahley ◽  
Carolyn A. Fitch ◽  
Wesley E. Stites ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Structural Reorganization ◽  
Apparent Dielectric Constant

IDENTIFICATION OF SUBSURFACE DRAIN LOCATIONS WITH GROUND-PENETRATING RADAR

1989 ◽  
Vol 69 (2) ◽  
pp. 223-234 ◽  
Author(s):  
T. L. CHOW ◽  
H. W. REES
Keyword(s):  
Dielectric Constant ◽  
New Brunswick ◽  
Ground Penetrating Radar ◽  
Electromagnetic Wave Propagation ◽  
Soil Types ◽  
Propagation Time ◽  
Wave Propagation Velocity ◽  
Apparent Dielectric Constant ◽  
Ground Penetrating ◽  
Moisture Conditions

Ground-penetrating radar (GPR) is a geophysical tool designed for subsurface probing of materials with contrasting dielectric properties. The applicability of this technique to locate agricultural drain tiles or tubes under some soil types and moisture conditions found in New Brunswick and Nova Scotia was evaluated. A method using GPR graphical outputs from adjacent, paired parallel traverses was developed to verify tile drain signatures. Over 50 drains, installed from 1 to 50 years ago, in soils developed in morainal till, glaciofluvial, and glaciomarine deposits were detected with the GPR system and confirmed by excavation. These included both clay and plastic drains. With experience, reliability was found to be close to 100%. The possibility of using the system for determining depth to the drain is also discussed briefly. Key words: Ground-penetrating radar, tube drain location, apparent dielectric constant, propagation time, electromagnetic wave, propagation velocity

scholarly journals The Effects of Salinity of Pore Water on Apparent Dielectric Constant and Resistivity in Sands.

2001 ◽  
Vol 42 (3) ◽  
pp. 140-148
Author(s):  
Weiren LIN ◽  
Hiroshi YAMAOKA ◽  
Nobutaka SUGITA ◽  
Manabu TAKAHASHI
Keyword(s):  
Dielectric Constant ◽  
Pore Water ◽  
Apparent Dielectric Constant

scholarly journals Effects of Probe Installation Method, Crack Existence and High Temperature on Apparent Dielectric Constant Determined by Time Domain Reflectometry in Rocks

1999 ◽  
Vol 29 (4) ◽  
pp. 189-204
Author(s):  
Weiren LIN ◽  
Noboru HIRAHARA ◽  
Kaoru NISHIDA ◽  
Manabu TAKAHASI ◽  
Toshihiro SAKAKI
Keyword(s):  
Dielectric Constant ◽  
High Temperature ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Apparent Dielectric Constant

Time domain reflectometry for water content and density of soils: study of soil-dependent calibration constants

2005 ◽  
Vol 42 (4) ◽  
pp. 1053-1065 ◽  
Author(s):  
V P Drnevich ◽  
A K Ashmawy ◽  
X Yu ◽  
A M Sallam
Keyword(s):  
Dielectric Constant ◽  
Water Content ◽  
Time Domain ◽  
Field Experiments ◽  
Engineering Application ◽  
Time Domain Reflectometry ◽  
Sensitivity Analyses ◽  
Dry Density ◽  
Theoretical Predictions ◽  
Apparent Dielectric Constant

The paper studies the soil-dependent calibration constants used for determining water content and density of soil using time domain reflectometry (TDR), specifically, to establish the typical soil calibration values and study the extent of the uncertainty in calibration factors on measurement accuracy. The TDR method described here makes use of a calibration equation normalized by soil dry density, which involves two soil-dependent constants, a and b. Both a and b have physical significance, with the value of a related to the apparent dielectric constant of the dry density – normalized dry soil solids and the value of b related to the apparent dielectric constant of the pore fluid. From theoretical predictions, typical values of a are around 1.0, and typical values of b are around 9. Practically, the constants a and b are obtained through calibration tests performed in conjunction with standard compaction tests. Experimental study shows that calibration constants fall within the ranges from theoretical predictions. Tests on five soil mixtures provided average values of a = 0.945 and b = 8.76, while 11 clean sands resulted in average values of a = 1.0 and b = 8.5. The study also shows that there are no significant effects of compaction energy on the measured values of a and b. Sensitivity analyses indicate that variations in a and b both cause variations in TDR-determined water content and density, but the variations are typically within acceptable limits for engineering application purpose. Results from TDR tests on simulated field experiments are consistent with the sensitivity analyses.Key words: time domain reflectometry, TDR, calibration constants, water content, dry density, sensitivity.

On: “Theory of microwave dielectric constant logging using the electromagnetic wave propagation method,” by R. Freedman and J. Vogiatzis (GEOPHYSICS, May, 1979, p. 969–986).

Geophysics ◽  
1980 ◽  
Vol 45 (10) ◽  
pp. 1530-1532 ◽  
Author(s):  
H. Pascal ◽  
D. Rankin
Keyword(s):  
Dielectric Constant ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Plane Wave ◽  
Electromagnetic Wave Propagation ◽  
Wave Model ◽  
Well Logging ◽  
Microwave Dielectric ◽  
Interesting Paper ◽  
Wave Propagation Method

In the interesting paper by Freedman and Vogiatzis, the Schlumberger EPT dielectric well logging method is discussed. The authors pay particular attention to the analysis of the formation traveltime and calculate, for several realistic sources, the corrections to the values of the plane wave model used by Schlumberger.

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