SPREADING RESISTANCE METHOD AND APPARATUS FOR DETERMINING THE RESISTIVITY OF A MATERIALA three-point probe is employed to determine the spreading resistance of a material with the spreading resistance probe, which is common to both the current source and a voltage measuring means, being moved into ...
4.The method according to claim 1, further including the steps ofretracting the probe from the formation, andperforming a direct current resistivity measurement during retraction. 5.A system for determining in situ oxidation-reduction potential in a formation having a surface separating the formation ...
Parameters to be modeled are electrical resistivity, thermal conductivity, specific heat, the convection heat transfer coefficient, and the heat of fusion. Also, a variety of models are examined to determine an optimum number of model sections for required response accuracy. The three-section model ...
The strength of a glued joint is determined by measuring its resistivity and comparing it with a curve of strength versus resistivity prepared from a series of glued samples. The figure shows four bare wire electrodes 1 in a glued seam. An A. C. is applied between the outer pair and the...
This current vector multiplied times the local resistivity gives the local electrical field. The components of that on the skin are what is called the ECG. By pulsing the shunt across the chest it is possible to modulate that resistance (i.e. “impedance modulation”). This is similar to ...
It has been determined from experience in using systems such as shown in FIG. 1 that transmitter to receiver distances (“offsets”), represented by r, within a range of about 2d≦r≦4d are required to resolve the resistivity of a particular (“target”) formation disposed at a depth d ...
SUMMARY invented: the device comprises a sealed chamber with a window, placed inside each heater configured dvuhr discharge continuous winding wire made of a material with high resistivity and having a cylindrical shape conjugated with a truncated cone ,,. Inside the heater is placed a crucible ...
Atomic-scale silicon wires, patterned by scanning tunneling microscopy (STM) and degenerately doped with phosphorus (P), have attracted significant interest owing to their exceptionally low resistivity and semiclassical Ohmic conduction at temperatures as low as T = 4.2 K. Here, we investigate the ...
7. The system of claim 6, wherein the memory stores a first reference signal (Vref) and a second reference signal (Vref) that are respectively obtained by the first receiver and the second receiver in a reference medium having a resistivity that is higher than that of the region in the ...
In my U.S. patent application, Ser. No. 879,147, I have disclosed a method for determining pressure conditions in a well bore from shale samples wherein resistivity measurements and/or sodium ion potential differences are measured and plotted graphically for different elevations in a well. ...