s of Presentations Monday, April 3, 2006

The potential of thermal nonlinear effects in composite materials was investigated for nondestructive testing. Second harmonic generation in thermal-wave fields has attracted much attention in recent years for the non-destructive evaluation of solid structures. Even though not the only source, the presence of a defect can result in a strong nonlinear signature, which could enhance the detectabi...

A wide variety of desirable antenna beam patterns can be synthesized by optimal excitation and phasing the HE11 HE12 modes in scalar corrugated feedhorns. However, bandwidth such two-mode horns is often limited modal dispersion. In this paper we introduce a class low dispersion, feedhorns that operate, some cases, over operating bandwidths 40-50%. We provide example designs include with high co...

The need for water conservation continues to increase as global freshwater resources dwindle. Turfgrass mangers are adapting these concerns by implementing new tools reduce consumption. Time-domain reflectometer (TDR) soil moisture sensors can decrease usage when scheduling irrigation, but nonuniformity across unsampled locations creates irrigation inefficiencies. Remote sensing data have been ...

The study figures out the potential of CASI airborne hyperspectral imagery for the fine segmentation and characterization of small size landscape units, the hedges, essential for hydrologists and landscape planners. The segmentation strategy consists in computing every hedge discriminating feature : radiometry, texture and linear shape. Original methods taking into consideration the full spectr...

We present a new method of digital correlation, which uses the technology of direct intermediate frequency or radio frequency sampling and digital phase shift. Digital correlators down-sample IF or RF signals with 3-bit analog-to-digital converters and then delay one sampling interval for quadrature phase shift. Following the same procedure as analog correlation, the digitalized I/Q pairs are p...

This paper discusses theoretical foundations of quantitative image-based measurements for extracting and reconstructing geometric, kinematic and dynamic properties of observed objects. New results are obtained by using a combination of methods in perspective geometry, differential geometry, radiometry, kinematics and dynamics. Specific topics include perspective projection transformation, persp...