The ‘‘superprism effect’’ is an effect observed in photonic crystal structures whereby the direction of light propagation is extremely sensitive to the wavelength and angle of incidence. To realize the superprism effect, new structures are presented which rely on the sensitivity of the phasevelocity in a two-dimensional (2D) photonic crystal slab to observe angular magnification outside the pho...

The boundary–value problem of the reflection and transmission of a plane wave due to a slab of an electro–optic structurally chiral material (SCM) is formulated in terms of a 4×4 matrix ordinary differential equation. The SCM slab can be locally endowed with one of 20 classes of point group symmetry, and is subjected to a dc voltage across its thickness. The enhancement (and, in some cases, the...

Abstract: The seepage control system of a high Concrete Face Rock-Fill Dam (CFRD) may have anti-seepage deficiencies during both construction and operation. In order to solve these, the three-dimensional Finite Element Method (FEM) model was built based on dam body filling, anti-seepage system, defect location and bedrock distribution. The seepage field simulation and computation were carried o...

We have carried out a theoretical study of the electronic structure and magnetic properties of both bulk and supercell slab CeCo2. The calculations are based on first-principles density functional theory with generalized gradient approximation (GGA) and also with the GGA+U scheme. Both GGA and GGA+U calculations predict bulk CeCo2 to be nonmagnetic, in agreement with experiments. However, calcu...

Introduction: The feasibility for imaging and quantifying absolute change of cerebral blood flow (CBF) using saturation-recovery T1 MRI approach has been previously demonstrated using rat ischemia (decreasing CBF) and hypercapnia (increasing CBF) models at 9.4T. Briefly, the water exchange between the capillary and brain tissues through the blood perfusion will affect the apparent water T1, thu...

In this contribution the impact of a presumed presence or absence of the ionospheric delays on the quality of the least-squares ambiguities is analysed. The spatial correlation and the time correlation of the ionospheric delays are captured in an a priori ionospheric variance matrix. It is shown how the size and shape of the ambiguity search space is a€ected by the use of these a priori ionosph...

The long-term goal of our research is to develop a reliable and accurate global ionospheric weather monitoring and forecast system which can serve as a prototype for an operational system. To achieve this goal, we are developing and validating advanced data assimilation techniques to analyze diverse sources of ionospheric measurements. The assimilation of ionospheric measurements into mature fi...