When gas or oil pipelines must be laid through sand or permafrost or other unstable soils, the pipe walls can he subjected to large bending loads if the soil shifts. In order to detect this condition and correct it, it would be useful to monitor the state of stress along the pipeline'at regular time intervals using a vehicle that is moved through the line by the fluid or gas in it. The experime...

Predators are an important source of mortality for animals that lay their eggs in buried nests. We asked how depth alters the process of predation for buried prey. We outlined a general model of predation risk where depth may alter both prey detection and subsequent capture: deeper prey are detected less often because the strength of olfactory cues decreases with burial depth and, once detected...

Abstrucf-Scattering from subsurface objects is studied using the T-matrix method. The scatterer is represented as a dielectric ellipsoid and the source is assumed to be an electric dipole in a borehole. This approach easily accommodates rotations of the scatterer relative to the source and also permits relaxation of the two-dimensional constraint inherent in some models. In addition, it provide...

It is well known that a huge number of buried landmines in the post-war countries are still active, and that many civilians are killed or injured by landmine related accidents every year. Therefore, detection and clearance of buried landmines is a very important issue. Metal detectors are the almost universally available fielded devices for landmine detection, but they have great difficulty in ...

Nonparametric Bayesian Context Learning for Buried Threat Detection by Christopher Ralph Ratto Department of Electrical and Computer Engineering Duke University

The work reported here makes use of scattering models to understand and develop quantitative predictions for the sub-critical-grazing-angle target detection performance observed in sonar field tests using the Naval Surface Warfare Center Panama City Division’s (NSWCPCD) synthetic aperture sonar (SAS) systems. Recent investigations have confirmed that diffraction of sound into the bottom by surf...

The aim of the study is to validate hyperspectral ground data for the detection of buried architectural remains. For this reason spectro-radiometric measurements were taken from an archaeological area in Cyprus. Field spectroradiometric measurements were undertaken from March to May of 2010. Spectro-radiometric measurements were taken over the previously detected magnetic anomalies using the GE...