The effect of atmospheric propagation on radar observations is an important topic both for radar application developers and end-users of radar products, particularly of weather radar systems. An excellent review of this subject is given by Patterson (2008), and most general books about weather radars have a chapter on the topic –see for example Battan (1973), Collier (1996), Doviak and Zrnic (2...

abstract   objective: to evaluate the surgical treatment of total anomalous pulmonary venous connection (tapvc) and determination of predictors for postoperative death. methods: between 1995 and 2005, 80 patients aged from 1 month to 12 years underwent surgical repair for supracardiac (39), cardiac (34), infracardiac (3) or mixed (4) type of tapvc. systemic pulmonary hypertension (ph) in 53.8% ...

As Biocca pointed out, the “two poles model“ of presence has only considered the virtual and pyshical spaces, but not the imaginary spaces. This work is aimed at comparing the sense of presence between virtual and imaginary environments. 100 participants were randomly assigned to one of the two conditions (imagined versus virtual spaces) and the subjective sense of presence was measured in thre...

We describe the ``WEDGE'' immersive projection theater. The WEDGE has been built as an affordable installation for university VR infrastructure in Australia. It achieves a ``semi-immersive'' sense of presence without, apparently, give rise to significant discomfort. The vertex region of the theater appears to be especially effective in giving a sense of presence. See http://wedge.anu.edu.au/ fo...

Narrow-band optical filtering is required in many spectroscopy applications to suppress unwanted background light. One example is quantum communication where the fidelity is often limited by the performance of the optical filters. This limitation can be circumvented by utilizing the GHz-wide features of a Doppler broadened atomic gas. The anomalous dispersion of atomic vapours enables spectral ...

Theoretical and experimental studies have been conducted of the transmission of phonons in sapphire and their reflection at a crystal-vacuum interface. The effects of crystal anisotropy on the reflection process, not previously noted in the literature, are discussed in detail. The heat-pulse technique has been used to obtain high-resolution timeof-flight spectra as a function of the angle of in...

We demonstrate that twisting one part of a chiral photonic structure about its helical axis produces a single circularly polarized localized mode that gives rise to an anomalous crossover in propagation. Up to a crossover thickness, this defect results in a peak in transmission and exponential scaling of the linewidth for a circularly polarized wave with the same handedness as structure. Above ...

As distance education rapidly appears on the horizon, distance learning technologies are becoming more important in delivering contents and allowing collaboration between students and teachers in globally disparate environments. One of the recent innovative technologies to be explored in distance learning field is immersive environments and sense of presence that offers. The primary purpose of ...