2D reconstruction and quantification of synapse orthogonal projections (shado\VS) are proposed as apractical approach to obtain information about differences in their actual configuration. Thequantification of the shadows implies estimation of size parameters (area and perimeter) and shapefunctions (i.e. second order moment invariants independent of location and size). The method wa...

PURPOSE The purpose of this study was to evaluate the results of the repair of perforated sinus membranes with resorbable collagen membrane. MATERIALS AND METHODS A split-mouth design was followed. Twelve subjects requiring bilateral sinus grafting were included in the study; one site had been accidentally perforated during sinus augmentation and the other site had not been perforated. The pe...

The present paper reports the laminar fluid flow and heat transfer of a heated array of circular-perforated and solid fins mounted over a flat surface using the finite-volume method. One to four circular cross-sectional perforations are made along the length of the fins. The SIMPLE algorithm is used for pressure-velocity coupling and the second order upwind technique is employed to discreti...

BACKGROUND Acute appendicitis (AA) is one of the most common surgical emergencies, whosepostoperative morbidity and mortality increase significantly when the appendix perforates. The identification of factors that lead to perforation in these patients might effectively reduce morbidity. In this study, factors associated with perforation in AA were examined. METHODS The study included sixty pa...

INTRODUCTION The prevailing view on appendicitis is that the main aetiology is obstruction owing to faecoliths in adults and lymphoid hyperplasia in children. Faecoliths on imaging studies are believed to correlate well with appendicitis. METHODS A retrospective chart review was conducted of 1,014 emergency appendicectomy patients between 2001 and 2011. Faecolith prevalence in adult and paed...

A trisonic wind tunnel has been modified to improve its flow quality when operating at transonic speeds through perforated walls and side suctions. The usefulness of such a perforated wall, already known, is reduction of the blockage effect as well as the shock elimination. Two types of perforated walls have been used in this investigation. The first wall had a porosity of about 22% and the hol...

It is believed that the appendix will be perforated if the surgery of an acute appendicitis is delayed. However, some of the recent studies, contested this hypothesis and shown that only a delay in the treatment cannot fully explain perforated appendicitis. This study aimed to examine the prevalence and risk factors for perforated appendicitis in patients with acute appendicitis. A cross-sectio...

Transmission spectra of thin metal films perforated by a high density of disordered sub-wavelength diameter cylindrical holes have been measured. The films, consisting of duplex layers of chromium and gold or chromium and silver, were characterised by perforations of mean diameter, hdi and fractional area coverage, F: films with hdi and F of 187F 50 nm and 0.21, and 340F 67 nm and 0.28 were stu...

PURPOSE Emergency operations for perforated peptic ulcer are associated with a high incidence of postoperative complications. While several studies have investigated the impact of perioperative risk factors and underlying diseases on the postoperative morbidity after abdominal surgery, only a few have analyzed their role in perforated peptic ulcer disease. The purpose of this study was to deter...

The effects of repairing the perforated sinus membrane with collagen membrane are unknown. The purpose of this pilot study was to clinically, histologically, and histomorphometrically evaluate the results of repairing the perforated sinus membrane with resorbable collagen membrane. A split-mouth design was followed in the current study. Five subjects requiring bilateral sinus grafting were incl...