PURPOSE To present the success rate in treating congenital nasolacrimal duct obstruction with hydrostatic pressure (Crigler method). METHODS Clinical data from 186 children aged up to 32 months treated from 1990 until 2005 were reviewed retrospectively. The procedure was repeated up to 3 times at a one week interval. Using EPI INFO version 6.04 software for analysis, data were tabulated and s...

A grid-free scheme for solving quasi-one-dimensional, isentropic, compressible flow in the subsonic regime is developed with a view toward its eventual generalization to three-dimensional turbulent compressible flow. The computational elements contain information about the dilatation and temperature fields. Velocity is recovered by summing over the contributions of individual elements. Differen...

A model for steady laminar natural convection inside vertical, arbitrarily shaped isothermal ducts of constant cross section is presented. The model is based on a combination of asymptotic solutions for fully developed and developing, boundary-layer  ow. The fully developed asymptote model utilizes forced convection, internal  ow modeling techniques, and an approximate model is presented, whi...

background : the application of ventilation systems in industries and workplaces is with the aim of improving environmental conditions for employees. the lack of appropriate ventilation system components design and control methods result in the production of sound and vibration in most components. the purpose of this study was to determine the role of the pad isolator in controlling vibration a...

Neutral beam injection systems have proven to be the single most effective form of heating for tokamak plasmas. Typical beam pulse lengths are of the order of ten seconds and the major limitation to increased pulse length in multi-megawatt beamlines is the effect of re-ionised neutral particles in the restricted drift space, or “duct”, connecting the beamline to the tokamak vessel. These partic...

The spatial growth of small perturbations developing on a fully developed base flow in a duct with two inhomogeneous cross-flow directions is examined. For a laminar mean flow it is shown that optimally configured vortices at an upstream cross-section induce large transient amplification of a disturbance energy norm downstream. Such a linear growth is a likely initial stage of transition in duc...

In this paper, several low and high Reynolds number versions of k-ε and Reynolds stress turbulence models have been evaluated in a channel and a square duct flow with and without a magnetic field by comparing the predictions with direct numerical simulations data. The simulations are performed using FLUENT solver. The additional source terms for magnetic field effects on turbulence have been in...

aim : to assess the complications of bile duct injury in laparoscopic cholecystectomy in loghman medical center, tehran. background : the incidence of complications of laparoscopic cholecystectomy has increased dramatically since the introduction and widespread use of laparoscopic cholecystectomy.  patients and methods : from january 1998 to january 2002, a total of 155 laparoscopic cholecystec...

Experimental observations show that a strong magnetic field has a dramatic influence on the sedimentation of RBCs, which motivates us to model the sedimentation of red blood cell (RBC) under strong external magnetic body force. To model the sedimentation of a RBC in a square duct and a circular pipe, a recently developed technique derived from the lattice Boltzmann and the distributed Lagrange ...

The issue of the equivalence physical parameters working medium in heat-treatment zone fish and meat products is solved by organizing uniform high-speed fields area, which ensured corresponding design. aerodynamic characteristics a double-sided centrifugal blower fan with vertical arrangement drive shaft spiral scroll two outlet openings, outlines were carried out according to design square rul...