نتایج جستجو برای: buried features
تعداد نتایج: 533750 فیلتر نتایج به سال:
Background reverberation can obscure useful features of the target echo response in broadband low-frequency sonar images, adversely affecting detection and classification performance. This paper describes a resolution and phase-preserving means of separating the target response from the background reverberation noise using a coherence-based wavelet shrinkage method proposed recently for de-nois...
Computed Atlas of Surface Topography of proteins (CASTp) provides an online resource for locating, delineating and measuring concave surface regions on three-dimensional structures of proteins. These include pockets located on protein surfaces and voids buried in the interior of proteins. The measurement includes the area and volume of pocket or void by solvent accessible surface model (Richard...
A new development in spin-polarized neutron reflectometry enables us to more fully characterize the nucleation and growth of buried domain walls in layered magnetic materials. We applied this technique to a thin-film exchange-spring magnet. After first measuring the reflectivity with the neutrons striking the front, we measure with the neutrons striking the back. Simultaneous fits are sensitive...
A 24-year-old man was admitted with pain and swelling in the left forearm. He admitted introducing several long screws in his forearm, manually one by one, the previous night. The shafts of the screws were buried deep into the muscles of the forearm though their heads were still visible from the surface. This patient has been found to exhibit features of SHAFT syndrome on numerous occasions in ...
Wind-abraded rocks, ripples, drifts, and other deposits of windblown sediments are seen at the Columbia Memorial Station where the Spirit rover landed. Orientations of these features suggest formative winds from the north-northwest, consistent with predictions from atmospheric models of afternoon winds in Gusev Crater. Cuttings from the rover Rock Abrasion Tool are asymmetrically distributed to...
BACKGROUND Radiofrequency ablation (RFA) is an endoscopic technique used to eradicate Barrett's esophagus (BE). However, such ablation can commonly lead to neosquamous epithelium overlying residual BE glands not visible by conventional endoscopy and may evade detection on random biopsy samples. OBJECTIVE To demonstrate the capability of endoscopic 3-dimensional optical coherence tomography (3...
The Electrical Conductivity Object Locator (ECOL) has been developed with the goal of detecting buried objects. Its specific capability to detect and characterize small-size plastic and metal objects buried at shallow depths is demonstrated. The technique can also detect larger objects at greater depths. The ECOL technique maps the soil subsurface conductivity and identifies variations in the c...
Introduction: Lunar volcanism creates a wide variety of features such as domes, rilles, and large pyroclastic deposits. Mapping the subsurface column structure of the upper part of these deposits can provide key information about how they were formed and how the surface regolith developed through subsequent weathering. In addition, many possible lunar landing sites (e.g., the Constellation site...
Guided-mode resonance on pedestal and half-buried high-contrast gratings for biosensing applications
Abstract Optical sensors typically provide compact, fast and precise means of performing quantitative measures for almost any kind measurand that is usually probed electronically. High-contrast grating (HCG) resonators are known to manifest an extremely sharp sensitive optical resonance can constitute a highly suitable sensing platform. In this paper we present two advanced high-contrast design...
In this paper, a signal processing technique is developed to reduce clutter due to ground bounce in ground penetrating radar (GPR) measurements. This technique is especially useful when a GPR is used to detect subsurface antipersonnel mines. The GPR clutter is modeled using a simple parametric model. Buried mine and clutter contributions are separated through a pair of coupled iterative procedu...
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