High-resistivity p-type silicon has emerged as one of the most promising materials for the finely segmented detectors to be used in particle physics experiments where high levels of radiation damage are expected. Beside the standard high-purity float-zone (FZ) silicon, relatively high-resistivity magnetic Czocharlski (MCz) is now available from industry. This material has been proposed as possi...

Large negative magnetoresistance ~MR! observed in transport measurements of hcp Co films with stripe domains were recently reported and interpreted in terms of domain-wall ~DW! scattering mechanism. Here detailed MR measurements, magnetic force microscopy, and micromagnetic calculations are combined to elucidate the origin of MR in this material. The large negative room-temperature MR reported ...

A 2D nonlinear model for the electrical potential in the edge plasma in a tokamak generates a stiff problem due to the low resistivity in the direction parallel to the magnetic field lines. An asymptotic-preserving method based on a micromacro decomposition is studied in order to have a well-posed problem, even when the parallel resistivity goes to 0. Numerical tests with a finite difference sc...

The resistivity in the ferromagnetic state of flux-grown La 2/3 (Pb,Ca) 1/3 MnO 3 single crystals, measured in magnetic fields up to 7 T, reveals a strong quadratic temperature dependence at and above 50 K. At lower temperatures , this contribution drops precipitously leaving the resistivity essentially temperature independent below 20 K. The Seebeck coefficient also reflects a change of behavi...

The paper presents interesting data on a critical issue: estimation of carbon stocks of tropical peatlands. However, the paper, as currently written, is not well structured for Biogeoscience discussion. It is too technical and focused on the geophysical methods. The paper should be restructured and extended for a publication in Biogeoscience discussions or sent to another journal more focused o...

because of urgent needs of groundwater resources in the tochal region of north tehran, an integration of electric and electromagnetic methods was applied to investigate the location and the direction of water bearing fractures. first, the vlf electromagnetic profiling was performed on suitable places and two locations were detected for supplementary resistivity surveys. then, a number of vertic...