The in-plane transport of strongly underdoped La2−xSrxCuO4 films was examined in the magnetic fields up to 14 T and in temperatures down to 1.6 K. While at high temperatures the samples display metallic-like resistivity, the low-T transport is governed by variable-range-hopping mechanism. Careful analysis shows that the temperature dependence of pre-exponential factor in Mott’s variable-range-h...

DPA (Differential Power Analysis) attacks statistically find the correlation between power consumption and secret data in crypto-hardware. WDDL (Wave Dynamic Differential Logic) is a standard cell-based countermeasure for DPA and guarantees a 100% switching factor to shield the power information. However, our experiments observe that WDDL fails to compensate the power imbalance. This paper prop...

The in-plane resistivity r and thermopower S of single crystal RNi2B2C ~R5Dy, Ho, Er, Tm! has been measured from 4 to 300 K. The resistivity is linear in temperature from about 100 to 300 K, but the lowtemperature dependence goes as T with p53.0, 2.6, 2.0, and 1.4, respectively, from Dy to Tm, in comparison to the T behavior previously reported for LuNi2B2C. The thermopower exhibits a region li...

Context. Rossby wave instability (RWI) at dead zone boundaries may play an important role in planet formation. Viscous hydrodynamics results suggest RWI is excited only when the viscosity changes over a radial distance less than two density scale heights. However in the disks around Solar-mass T Tauri stars, it is not viscosity but magnetic forces that provide the accretion stress beyond about ...

Coal used in Indian thermal power stations is of inferior grade having low heat value and high ash content due to drift origin. However, Indian power coal ash is specially known by its refractory in nature and low sulphur (below 0.5%) and alkalis (less than 1.5%) contents. Due to presence of low sulphur and alkalis and consequently having very high ash resistivity (10 – 10 O cm) it is difficult...

We show that when bulk graphene breaks into n-type and p-type puddles, the in-plane resistivity becomes strongly field dependent in the presence of a perpendicular magnetic field even if homogeneous graphene has a field-independent resistivity. We calculate the longitudinal resistivity xx and Hall resistivity xy as a function of field for this system using the effective-medium approximation. Th...

Abstract Deep sandstone reservoirs in the Paleogene Enping Formation of A-Oilfield, Pearl River Mouth Basin, are significant offshore petroleum targets for this basin. Compared with adjacent water zones and shales, pays low resistivity contrast (LRLC). Without new unconventional well-logging techniques, conventional interpretation has encountered difficulties these LRLC pays. In article, based ...

geophysical techniques remain the only ways to remotely and non-destructively sense the earth’s near subsurface and as such have the most promising prospect for rapid and accurate detection of underground tunnels. today, electrical resistivity and seismic refraction geophysical methods have been greatly developed to identify structures and underground cavities. in this study, the ability of the...

helicopter-borne electromagnetic (hem) is a fast and high resolution airborne electromagnetic (aem) method that is frequently used for imaging of the subsurface resistivity structures. this is a versatile and cost effective method, frequently has used in mineral and groundwater exploration and various environmental problems. modern frequency-domain hem systems utilize small electromagnetic, mag...

The objective of this study was to develop a methodology by which the risk from major accident hazards to the environment can be assessed or quantified. An index method, the Environmental Risk Index (ERI), has been developed based on an existing method, the Environmental Hazard Index (EHI), and the Department of the Environment (DoE) definitions of events that would constitute a major accident ...