نتایج جستجو برای: shallow subsurface structures
تعداد نتایج: 502856 فیلتر نتایج به سال:
We study the impact of syntactic and shallow semantic information in automatic classification of questions and answers and answer re-ranking. We define (a) new tree structures based on shallow semantics encoded in Predicate Argument Structures (PASs) and (b) new kernel functions to exploit the representational power of such structures with Support Vector Machines. Our experiments suggest that s...
A geophysical investigation that involves the integration of Vertical Electrical Sounding (VES), Resistivity Imaging (ERI), and Ground Penetrating Radar (GPR) methods was conducted on Papalanto, Ogun River floodplain, a location underlain by sedimentary terrain Southwestern Nigeria. This research aimed to image underground lithological units delineate shallow geologic structures in order charac...
Features are investigated in eddy current data that are sensitive to corrosion and fatigue cracks in airframe structures while invariant to other NDE noise factors. To investigate subsurface corrosion characterization at the faying surface, a series of eddy current studies were performed using an analytical model for varying total subsurface thickness loss and percentage of the thickness loss o...
The CLaC Lab’s system for the PASCAL RTE challenge explores the potential of simple general heuristics and a knowledge-poor approach for recognising paraphrases, using NP coreference, NP chunking, and two parsers (RASP and Link) to produce Predicate Argument Structures (PAS) for each of the pair components. WordNet lexical chains and a few specialised heuristics are used to establish semantic s...
We describe a technique for surface and subsurface micromachining of glass substrates by using tightly focused femtosecond laser pulses at a wavelength of 1660 nm. A salient feature of pulsed laser micromachining is its ability to drill subsurface tunnels into glass substrates. To demonstrate a potential application of this micromachining technique, we fabricate simple microfluidic structures o...
Anthropogenic infrastructures in the shallow subsurface, such as heated basements, tunnels or geothermal systems, are known to increase ground temperatures, particularly urban areas. Numerical modelling helps inform on extent of thermal influence structures, and its potential uses. Realistic subsurface is often computationally costly requires large amounts data which not readily available, nece...
Until recently, optical processes in shallow water, where a large portion of solar photons penetrate to the ocean floor, has received little attention outside of a relatively small number of modeling and remote sensing investigations. In the open ocean, scales of variability in relation to optical attenuation length often permit the treatment of the inwater light field as a one-dimensional, dep...
[1] A wave equation-based poststack depth migration method is proposed to image the Earth’s internal structure using teleseismic receiver functions. By utilizing a frequency wave number domain one-way phase screen propagator for wave field extrapolation in the migration scheme, common conversion point (CCP) stacked receiver functions are backward propagated to construct a subsurface structural ...
We have developed a method for three-dimensional simultaneous velocity and density inversion using traveltimes of local earthquakes and gravity data. The purpose of this method is to constrain the velocity inversion and increase the spatial resolution of shallow velocity structures by introducing additional gravity data. The gravity data contributes to the Pand S-wave velocity models by imposin...
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