Wave Energy Dissipation Using Perforated and Non Perforated Piles

Experimental Studies of Wave Transmission through Single Perforated Sheets and Upright Perforated Wave Filters

Perforated appendicitis vs non-perforated appendicitis.

Of 156 patients with acute appendicitis, seen during 24 months, 21 had perforated. Age over 30 years especially in males, duration of symptoms over 48 hours, pulse rate on admission exceeding 100/ minute, generalised abdominal tenderness, leucocyte count in excess of 10,000 mm3 and a neutrophilia in excess of 70 percent, characterized patients with appendicular perforation. The rate of complica...

Theoretical and Experimental Studies of Upright Perforated Wave Filters

Liu et al. (1987) proposed a theoretical solution for scattering of waves through a permeable dissipation region. On the basis of bulk dissipation of the incident wave energy, this method is extended to evaluate the reflection and transmission coefficients of waves through a wave filter composed of rows of perforated sheets aligned normally to the direction of wave propagation. The results of t...

Non-perforated duodenal diverticulitis

Diverticula rarely occur within the lumen of the duodenum and are diagnosed in 2-5% of patients. They usually arise near the papilla of Vater and extend distally [1]. Duodenal diverticula are classified into two types: extraluminal or intraluminal. Although the patient with a diverticulum may be asymptomatic, a duodenal diverticulum usually presents with typical or atypical symptoms of peptic u...

A Mathematical Model for Analysis of Upright Perforated Wave Absorbers

On the basis of the continuity equation and the Bernoulli equation in the steady form, a differential equation is developed to evaluate the successive water levels within compartments of an upright perforated wave absorber. Then the initial and boundary conditions are introduced and the differential equation is solved as an initial value problem. Finally the reflection coefficient from the wave...

A Comparative Study of Perforated and Non-Perforated Appendicitis With Respect to Clinical and Laboratory Findings

Introduction:The vermiform appendix is considered by most to be a vestigial organ, its importance in surgery is only due to its tendency for inflammation resulting in the syndrome called acute appendicitis. Acute appendicitis is the most common cause of an “acute abdomen” in young adults. Appendectomy is the most frequently performed emergency abdominal operation. Present study was undertaken t...