purpose: to examine the relationship between retinal nerve fiber layer (rnfl) measurements obtained using scanning laser polarimetry with variable corneal compensation (vcc) and central corneal thickness (cct) measurements using pentacam in myopic patients methods: the study included 45 eyes from 45 myopic patients with intraocular pressure (iop) measurements≤21 mmhg. all participants had norma...

Effect of clamping pressure on electrical resistance between Gas diffusion layer (GDL) and bipolar plate is a very important parameter in Proton exchange membrane (PEM) fuel cells. For investigation of this matter some researches have been done in these years. But there is not an experimental investigation of clamping pressure effect on PEM electrical resistance. In this paper, some experimenta...

In this paper, a mathematical model for symmetrical multi-layer sheet rolling, in which the layers are unbounded before rolling, by using the upper bound method and stream function theorem is proposed. Using this model, we can investigate the plastic deformation behavior of sheets at the roll gap during rolling. Effect of various rolling conditions such as initial and final thickness and flow s...

We report an experimental investigation on the relationship between the thickness of the viscous boundary layer and the highest excitation (or cuto ) frequency of the temperature power spectrum in turbulent convection, using water as working uid. For the range of the Rayleigh number spanned in the experiment (10–10), we con rm that the peak position in the cuto frequency pro le can be used as a...

The present article is dedicated to the numerical solution of the Poisson equation with a thin layer of different conductivity and of random thickness. We change the boundary condition to transform the boundary value problem given on a random domain into a boundary value problem on a fixed domain. The randomness is then contained in the coefficients of the new boundary condition. This thin coat...

The purpose of this paper is to study the relationship between columnar aerosol optical thickness and ground-level aerosol mass. A set of Sun photometer, elastic backscattering lidar and TEOM measurements were acquired during April 2007 in Lille, France. The PM2.5 in the mixed boundary layer is estimated using the lidar signal, aerosol optical thickness, or columnar integrated Sun photometer si...

ORGANOHALOGEN COMPOUNDS – Volume 66 (2004) 138 Introduction Polyurethane foam (PUF) samplers are being used in an increasing number of studies to passively sample semivolatile organic compounds (SOCs) in the atmosphere (e.g. 1, ). However, recent research shows that the uptake and loss kinetics of passive air samplers is influenced by changes in wind speed . According to theory, the rate of che...

The dependence of the photocurrent, in a planar metalsemiconductor-metal photodetectors (MSM), on active layer thickness and incident optical power is investigated using a two-dimensional drift-diffusion model. The model numerically solves the hasic semiconductor equations using appropriate boundary conditions at the Schottky contacts. The calculated results show good agreement with experimenta...

We show that at the standard laboratory wavelength of CuKa the scattering factors of Cu and NiosFeo2 are identical, thereby making it impossible to distinguish the boundary of the Cu spacer layer in a Cdpermalloy spin valve structure from grazing incidence x-ray reflectivity curves. Use of grazing incidence fluorescence, in conjunction with x-ray reflectivity provides sufficient information to ...

The behavior of a polyelectrolyte adsorbed on a charged substrate of high-dielectric constant is studied by both Monte-Carlo simulation and analytical methods. It is found that in a low enough ionic strength medium, the adsorption transition is first-order where the substrate surface charge still keeps repulsive. The monomer density at the adsorbed surface is identified as the order parameter. ...