resistivity index

resistivity index

[‚rē‚zis′tiv·əd·ē ‚in‚deks]
(petroleum engineering)
Ratio of the true electrical resistivity of a rock system at a specified water saturation, to the resistivity of the rock itself; used for calculation of electrical well-logging data.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
After electronic cigarette vaping, the researchers found that the resistivity index was higher (2.3 percent) and luminal flow-mediated dilation was severely blunted (−34 percent).
The peak systolic flow rate, mean flow rate, pulsatility index (PI), and resistivity index (RI) measurements of the right and the left anterior carotid arteries, middle cerebral artery, and posterior cerebral artery were made from the temporal window after the patient had been positioned before water-pipe smoking (Figure 1).
However, when compared with eDON patients, the group without eDON had significantly higher Doppler ultrasound parameters for the OA (peak systolic flow velocity p=0.019, mean flow p=0.013) and for the CRA (peak systolic flow velocity p=0.010, end diastolic flow velocity p<0.001, resistivity index p=0.009).
They also found a significant correlation between the resistivity index and Barrett's muscle index (an index that quantifies extraocular muscle impingement on the optic nerve) (14-16).
Renal resistivity index calculated for obstructed kidney and unobstructed contralateral kidney.
Another study evaluated the renal resistivity index in 10 healthy dogs after a single WBVE session (table 1) was performed by Freire and colleagues.18 Ultrasound exams were performed to identify and evaluate each kidney and the renal vascular tree before and immediately after the vibration session.
On the basis of the fractal theory, the transformation relationship between the capillary pressure, relative permeability, and resistivity index was established by Li (2011).
The renal artery ultrasound confirmed the clinical suspicion of renal artery stenosis, with uni- or bilateral involvement, resistivity index; the last parameter has the most important role in the therapeutic strategy for renovascular hypertension.
OBM contamination reduced the compressive strength and the changed the electrical resistivity index (RI24) in all of the samples studied.
resistivity index. This plot is utilized to determine the appropriate n-exponent value to be utilized in the determination of [R.sub.w] from the Pickett plot.
(Figures 1B and 1C) The structure exhibited hilar vascularity and PW-Doppler (Figure 1D) demonstrated a resistivity index of 0.5 which was in accordance with a reactive lymphadenopathy (4,5).
Intrarenal resistivity index (IRI) is a measure of the hemodynamic changes in the intra-renal arteries.