Resistivity and induced polarization (IP) measurements (0.1–1000 Hz) were made on clay‐free unconsolidated sediments from a sandy, alluvial aquifer in the Kansas River floodplain. The sensitivity of imaginary conductivity σ″, fundamental IP measurement, to lithological parameters, fluid conductivity, degree saturation was assessed. previously reported power law dependence surface area grain size is clearly observed despite narrow lithologic range encountered this sedimentary sequence....

Aim: Quantitative measurement of spinopelvic parameters from radiographs is important for assessing spinal disorders but limited by the subjectivity and inefficiency manual techniques. Deep learning may enable automated with accuracy rivaling human readers. Methods: PubMed, Embase, Scopus, Cochrane databases were searched relevant studies. Eligible studies published in English, used deep radiographs, reported performance against raters. Mean absolute errors correlation coefficients pooled a...

Cyanide (CN) is a potent, fast-acting toxicant that impacts endogenous biomolecules in the nervous system, including acid-sensing ion channels (ASICs), which play vital role various neurological and psychological conditions. Here, we demonstrate CN rapidly potentiates ASIC currents cultured mouse cortical neurons dose-dependent manner while causing leftward shift pH dose-response curve. Notably, this potentiation was unaffected by 30-min treatment or presence of ATP recording pipette....

We present an array evaluation of standard and non-standard arrays over a hydrogeological target. develop the by linearly combining data from pole-pole (or 2-pole) array. The first test shows that reconstructed resistances for Schlumberger dipole-dipole are equivalent or superior to measured in terms noise, especially at large geometric factors. inverse models also confirm what others have presented target resolvability, namely has highest resolution. In second test, we reconstruct random...

ABSTRACT A validation experiment, carried out in a scaled field setting, was attempted for the long electrode electrical resistivity tomography method order to demonstrate performance of technique imaging simple buried target. The experiment an approximately 1/17 scale mock‐up region encompassing nuclear waste tank on Hanford site. target focus constructed by manually forming simulated plume within vadose zone using simulant. results were compared from conventional point electrodes surface...

Freeze-thaw cycling of frozen soils is known to be the cause various engineering failures infrastructure in cold regions. Researchers found that electrical resistivity methods outperform traditional ground surveying for their greater convenience and cost-effectiveness. However, detailed investigation into relationship between soil a variety properties still needed. In this study, series laboratory experiments using Wenner method were conducted determine geotechnical such as initial water...

SUMMARY Direct contact, frequency-dependent, electrical relaxation effects in soils are well documented both conductivity and dielectric permittivity-dominated frequency regimes. These signatures result from charge displacement physical processes at varying scales ranging conductivity-dominated ionic transport soil–grain pore-fluid interfaces to water molecule rotation. Given the mechanisms associated with these signatures, it is possible gain vital soil characteristics needed for a variety...

Thin wires are a critical component of many types improvised explosive devices. Short with lengths on the order 30 cm to few meters difficult detect using electromagnetic induction metal detectors due currents having only small cross-section wire circulate on. Longer tens up kilometer often buried at depths which preclude detection. We demonstrate short detection and identification through acquiring response frequencies above traditional EMI range. In addition, long is shown electric field...

Discrete deep targets are a significant challenge for most surface-based geophysical techniques, even when considering high property contrasts. In general, methods lose lateral and vertical resolution with depth as result of the limited acquisition geometry increased signal attenuation. The former can be overcome through use cross-borehole methods, but localization is still needed optimal borehole placement. As such, relatively small, void located near maximum investigation (DOI) very...

Standoff electromagnetic induction (EMI) measurements of complex conductivity and permittivity for engineering soil properties have the potential to revolutionize way US Army handles route planning infrastructure assessment. An unmanned aerial system (UAS) based EM platform interrogation would wide reaching impact in a variety applications including: civil inspection, in-theater ingress egress routing, reduction false positives IED detection, permafrost mapping, among many others....

An evaluation of five petrophysical models for hydraulic permeability predication was completed a site-specific set alluvial sediments. The considered were the Kozeny-Carmen (1927–1937), Börner (1996), Revil-Cathles (1999), and two Revil-Florsch (2010) models. river deposited sediments represent relatively narrow grain-size distribution, acquired adjacent to Kansas River, in Olathe, Kansas. Using measured physical, electrical, data from Slater Glaser (2003) , comparison performance these...

This paper presents a sensor system for capacitive ice detection, with planar electrodes located on PCB. In order to minimize the required area, are concurrently designed as an antenna structure wireless data communication. With this approach compact and thin capacitance measurements can be realized. The works principle of mutual measurement method. An electrode one hand excitation source, emitting electric field few hundred kHz at same time other acts 2.45GHz ISM patch scientific questions...

This paper describes a comprehensive modeling approach for infrasonic (sub-audible acoustic) signals, which starts with an accurate representation of the source spectrum and directivity, propagates signals through environment, senses processes at receiver. The calculations are implemented within EASEE (Environmental Awareness Sensor Emitter Employment), is general software framework impacts terrain weather on target signatures performance diverse range battlefield sensing systems, including...