one of the challenges in non-destructive testing schemes using the ultrasound pulse-echo technique is to identify those defects whose sizes are less than or equal to the detection resolution that is dependent on the width of the ultrasound pulse. existing methods also require a reference specimen of the same defective material, which may not be available in some cases. we present a new method f...

An analytical solution of the equation describing diffusion of intrinsic point defects in semiconductor crystals has been obtained for a one-dimensional finite-length domain with the Robin-type boundary conditions. The distributions of point defects for different migration lengths of defects have been calculated. The exact analytical solution was used to verify the approximate numerical solutio...

One of the numerous methods recently employed to study the health of structures is the identification of anomaly in data obtained for the condition of the structure, e.g. the frequencies for the structural modes, stress, strain, displacement, speed,  and acceleration) which are obtained and stored by various sensors. The methods of identification applied for anomalies attempt to discover and re...

1920x1200 abstract: background: down syndrome is the most common chromosomal abnormality due to 21 trisomy that usually is accompany with congenital heart diseases. about fifty present of children with down syndrome have heart defects. this study was designed for the aim of abundance percents of septal heart defects in children with down syndrome at imam reza and imam ali hospitals in kermansha...

background: the standard methods for reconstruction of soft tissue defects in the leg include gastrocnemius flap for proximal third defects, soleus flap for middle third and free flap in the distal third. however, there are problems with the use of free flap, like increased operative time, damage of major vessels and the need for experienced microsurgeon. mathods: this prospective study was und...

residual ventricular septal defects (vsd) are major complications after cardiac surgery. we studied the incidence of this complication, risk factors for its occurrence and short-term follow-up in 179 pediatric patients that underwent surgical closure of vsd from april 2003 until may 2004. all data were gathered retrospectively except measurements of shunt ratio. studied risk factors included ag...

congenital defects of the pericardium are considered rare. until 1979 , the reported cases were only about 200.1 total absence of the left pericardium is the most common defect2 and less common is a partial defect of the left pericardium. other types, i.e. isolated right-sided defects, total pericardial absence and diaphragmatic pericardial defects are very rare.3 before the last decade, the di...

Holt-Oram syndrome is an autosomal dominant disorder, characterised by skeletal abnormalities of the upper limb associated with congenital heart defect, mainly atrial and ventricular septal defects. Skeletal defects exclusively affect the upper limbs in the preaxial radial ray distribution and are bilateral and asymmetrical. They range from clinodactyly, absent or digitalised thumb, hypoplastic...