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Imaging polarimetry has emerged as a powerful tool for application in the field of remote sensing. In this paper, we present a novel technique for estimating the surface normal angle of each of the individual facets of a target object using passive polarimetric data. The passive polarimetric imaging system described here uses multiple measurements of the output Stokes vectors along with the reflection...
In this paper two frequency domain methods for characterization of the dielectric properties of dry sand over a broad microwave frequency range will be presented. The investigated electromagnetic parameters of the soil relevant for most GPR applications are dielectric permittivity and loss tangent. Although the majority of GPR applications concentrate on frequencies below 1 GHz, this work will investigate...
We analyze the dispersive characteristics of the electromagnetic guided waves (at georadar frequency) to infer the electrical properties of materials that constitute a layered wave guide. WARR (Wide Angle Reflection and Refraction) georadar acquisitions could be carried out in both TE (Transverse Electric) and TM (Transverse Magnetic) configuration to collect the full wavefield at different offset...
GPR was applied in the semi-arid Sardon catchment (Salamanca, Spain) in order to analyze the distribution of the water table depth with a high spatial resolution to serve as input in the parameterization of a hydrological model. We used a pulse radar with a single 200 MHz bowtie antenna combined with a differential GPS and a survey wheel for accurate positioning. Measurements were performed following...
Some masonry arch bridges in Galicia (NW Spain) were surveyed with GPR using 250 and 500 MHz antennas. The main goal of this work was to perform an analysis of historical bridges, obtaining information about filling material homogeneity, detecting inclusions of different materials, defining structural faults -such as internal voids or cracks- and detecting ancient features -as hidden arches or previous...
Asbestos pipes are commonly used for water and sewage pressure mains. There are very few non-destructive ways of assessing the wall thickness and condition of these Asbestos Cement (AC) pipes. Traditionally, their examination was undertaken by tapping to remove a physical specimen (a 'coupon') of the pipe. This procedure is time consuming, costly and risky. Alternatively, the mains have to be shut...
Ground Penetrating Radar (`rail radar') technology has long been a focus for railway trackbed maintenance and renewals planning due to its non-destructive nature and its potential to offer significant efficiency savings in trackbed condition monitoring. This paper provides a brief introduction to the two main interpretation techniques (interface reflection and EM scattering) currently used to monitor...
A new method of producing yellow light based on the interaction of shock wave and photonic crystals was analyzed. The change of refractive index of compressed photonic crystals was simulated. At wavelength of 580nm, the variation of band gap was studied. The influence factors were analyzed, and overcoming methods were proposed. The results show that the central wavelength of yellow light was influenced...
This paper presents complex permittivity and permeability measurements and reflection analysis of a selection of iron-loaded absorbing materials. A precise transmission-reflection based waveguide measurement technique was used to accurately characterize the materials in the 2 to 40 GHz frequency range. Based on the individual absorption spectra the materials were combined to form a composite structure...
Multiview video (MVV) can provide viewers a complete 3D perception by its multiple-viewpoint feature. In order to support smooth viewpoint switching, virtual view synthesis is required. However, color and illumination information varies between views according to the light field conditions. This mismatch leads to ghost effects and wrong reflection phenomena. In this paper, a hybrid color compensation...
The modulated scatterer technique (MST) has shown promise as an embedded sensor technique for materials characterization and flaw detection. MST is based on illuminating a loaded scatterer/probe, usually a dipole antenna loaded with a PIN diode, with an electromagnetic wave. By detecting the backscattered (reflected) wave, information about the material properties in the vicinity of the probe can...
Wireless network simulation is used for research because of its simplicity and repeatability. While simple radio propagation models are evaluated quickly and are suitable for simple scenarios, sophisticated models can handle more complex environments and provide better accuracy. However, the cost of higher accuracy is slower execution speed. This paper describes experiments that validate ray-tracing...
with the acceleration of globalization, higher education is facing a more intense international competition environment. Bilingual Education is well-known to be prominent in fostering a second language acquisition and enhancing the leaner's comprehensive skills. Due to a late start, there are still some deep-seated problems to be resolved for Chinese bilingual education. Workshop teaching is an innovative...
In this paper, homogenized model for composite consisting from a dielectric slab and printed wiregrid is derived by use of a global optimization technique. Due to the presence of wiregrid, the effective permittivity is negative at low frequencies similarly to wire medias. In our approach, the derivation of the homogenized model assumes that both the TE and TM polarized transmission coefficients for...
The Bi-directional Reflectance Distribution Function (BRDF) describes the appearance of a material by its interaction with light at a surface point. When the materials in scene are invariant, a linear transformation occurs in the transmission change from lighting to outgoing radiance, which makes a real-time global illumination rendering achieved. However, such linear transformation does not hold...
E-Learning has become an important technique that educational as well as business institutions invest a great deal of money, time and effort in order to make use of it. E-Learning has proven to be the cheapest way to transmit knowledge to the largest number of people regardless of their location and the end used devices. Most of the existing e-Learning environments present some similarities and most...
While assess the bonding quality of thin plate, it is quite difficult to extract the characteristics of echoes for analysis because of the weakening of defect echoes which were interfered by the high reflection of metal layer and noise. Target on the non-stationary and time variant characteristic of echoes, this paper propose to use the short time Fourier transformation methods to conduct these kinds...
The paper introduces a conceptual model for the design of serious games and uses the Technology Acceptance Model (TAM) for its validation. A specially developed game introduced international students to public transport in Southampton. After completing the game, participants completed a short questionnaire and the data was analyzed using structural equation modeling (SEM). The results identified the...
The dimension of 2D or 3D ENG/ENZ metamaterial unit cell can hardly be smaller than one tenth of a wavelength at the present state of the art. This drawback does not allow experimental investigation of several recently proposed ideas of subwavelength ENG/ENZ-based antennas. Here, it is argued that the “mock experiments” based on very well known and matured plasma technology might be useful for testing...
Terahertz (THz) spectroscopy and THz imaging techniques are expected to have great potential for the noninvasive analysis of works of art. THz waves can penetrate opaque materials and create three-dimensional maps of materials by spectroscopic imaging non-destructively. Satisfactory results using model samples have been obtained by many institutions. In particular, the imaging by using THz pulses...
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