AIMS Speckle tracking has emerged as a quantitative technique for assessing left ventricular (LV) function. However, no normative data for LV twist using speckle tracking echocardiography (STE) are available in the black population. This study assessed myocardial mechanics by determining LV twist parameters in different age groups using STE, and evaluated the effect of ageing on LV twist in thi...

OBJECTIVE To compare learning styles of undergraduate and postgraduate medical students. STUDY DESIGN Observational, comparative study. PLACE AND DURATION OF STUDY Department of Medical Education, Army Medical College, NUST, Rawalpindi, Pakistan, during February and March 2012. METHODOLOGY A total of 170 students were divided into two equal groups of undergraduate students of Army Medical...

This document describes the design, fabrication and measurement results of the CART Mk2 10 m radio reflector prototype constructed at the Dominion Radio Astrophysical Observatory. Introduction The Composite Applications for Radio Telescopes (CART) project at the Herzberg Institute of Astrophysics’ (HIA) Dominion Radio Astrophysical Observatory (DRAO) in Penticton Canada is an ongoing effort to ...

Solar simulators are common laboratory devices to artificially reproduce the Sun emission spectrum. Their use in optic tests allows to study the effect of the solar radiation on both materials and components. This paper focuses on the effective design of the ellipsoidal reflector for concentrating solar simulators. A ray-tracing analytic model integrated to Monte Carlo simulation is proposed as...

The Log-2 portable xenon arc light coagulator (Fig. i) was developed (O'Malley, 1971) in an attempt to simplify the operative procedure and to make this form of therapy more widely available. The key to the small size of this instrument is a parabolic reflector built into the lamp (Fig. 2). The reflector redirects the radiation so efficiently that a I50 watt lamp performs the same function as t...

We suggest a new type of grating reflector denoted hybrid grating (HG) which shows large reflectivity in a broad wavelength range and has a structure suitable for realizing a vertical cavity laser with ultra-small modal volume. The properties of the grating reflector are investigated numerically and explained. The HG consists of an un-patterned III-V layer and a Si grating. The III-V layer has ...

Reflection energy from a linear reflector comes from an integrant over an aperture often described by the Fresnel zone. Within the Fresnel zone, the diffraction energy constructively builds the reflection energy. This paper uses diffraction theory to explain the reflector edge effect on amplitude and the amplitude variation within the Fresnel zone. Thus, discuss the Fresnel zone effect for AVO ...

Metal nanoparticles have been investigated as an efficient method to enhance the light absorption in thin film solar cell due to the surface plasmonic scattering. In this paper, we studied the light trapping by modifying the common silicon-nanoparticle-dielectric-back reflector structure. We reported the short circuit current (Jsc) enhancement of a two-layer nanoparticle structure, coated with ...

BACKGROUND In firefly light organs, reflector layer is a specialized tissue which is believed to play a key role for increasing the bioluminescence intensity through reflection. However, the nature of this unique tissue remains elusive. In this report, we investigated the role, fine structure and nature of the reflector layer in the light organ of adult Luciola cerata. PRINCIPAL FINDINGS Our ...