We investigated the potential of using a 24-electrode resistivity imaging apparatus for rapid reconnaissance surveys for natural-aggregate accumulation. The surveys were first calibrated at sites with known geometry of sand and gravel layers, which showed that subsurface accumulation of coarse material was accurately resolved with both 2and 4-m electrode spacing. The inverted absolute resistivi...

We have measured the resistivity and Hall effect of R2Fe17 (R = Y, Tb, and Gd) single crystals in the temperature T range 4 < T < 300 K and applied magnetic fields of up to 9 T. The anomalous Hall effect (AHE) is very anisotropic in these ferromagnets. The AHE resistivity, measured with an applied magnetic field H perpendicular to the c axis, is very large and varies quite linearly with the lon...

The thermoelectric power of the amorphous nonmagnetic alloy system Ni81.5B18.5-yPy (y = 0, 1.8, 3.7, 7.4, 13, 16.8 and 18.5 at % P) has been investigated in the temperature range between 77 and 350 K. The resistivity and temperature coefficient of resistivity have also been measured. The high temperature slope of the thermopower, the resistivity and the room temperature coefficient of resistivi...

the aim of this study was to identify various sulfidic mineralized zones in the ghare-tappeh cu deposit (nw iran) based on geo-electrical data including induced polarization (ip) and resistivity (rs) using the concentration-volume (c-v) and number-size (n-s) fractal models. the fractal models were used to separate high and moderate sulfidic zones from low sulfidic zones and barren wall rocks. b...

The transport and magnetic properties in ferromagnetic manganese-oxide thin films are studied based on the model of the coupling between the mobile d-electrons and the core spins in Mn ions. The spontaneous magnetization and the resistivity are obtained for various magnetic fields and temperature. The resistivity in absence of magnetic field and the magnetoresistance exhibit maxima near the Cur...

where d = thickness of the film, ,o = resistivity of the film, = resistivity of the bulk material having the same structure and approximately the same number of defects as the films, l0 = mean free path of the charge carriers. The values of l0 calculated by the two methods were found to agree satisfactorily. Figs. 7 and 8 show the variation of the Hall mobility (/̂ H) with film thickness and sub...

We have developed a new, quasi-Lagrangian approach for numerical modeling of magnetohydrodynamics in low to moderate b plasmas such as the solar corona. We introduce the concept of a ‘‘fluxon’’, a discretized field line. Fluxon models represent the magnetic field as a skeleton of such discrete field lines, and interpolate field values from the geometry of the skeleton where needed, reversing th...

We have developed a new, quasi-Lagrangian approach for numerical modeling of magnetohydrody-namics in low to moderate β plasmas such as the solar corona. We introduce the concept of a " fluxon " , a discretized field line. Fluxon models represent the magnetic field as a skeleton of such discrete field lines, and interpolate field values from the geometry of the skeleton where needed, reversing ...