نتایج جستجو برای: corneal visco
تعداد نتایج: 30157 فیلتر نتایج به سال:
The objective of this chapter is to introduce and to illustrate the frequent and wide occurrence of non-Newtonian fluid behaviour in a diverse range of applications, both in nature and in technology. Starting with the definition of a nonNewtonian fluid, different types of non-Newtonian characteristics are briefly described. Representative examples of materials (foams, suspensions, polymer solut...
Background and Objective: Proper method and machine for corneal evaluation is an important factor in many anterior segment interventions. This study was performed to compare the mean keratometry (K) readings obtained with an IOL Master and Pentacam for intraocular lens power calculation in normal subjects with no history of refractive surgery. Materials and Methods: Mean K values were obtained ...
Background: Human cornea expresses functional Fas-ligand capable of killing Fas+ activated lymphocytes. Fas expression is partly regulated by -670 A/G polymorphism in the promoter region of Fas gene. Objective: The aim of the present study is to determine the association between Fas-670A/G polymorphism and survival of corneal transplantation. Methods: In 276 graft recipients who mainly underwen...
ABSTRACT Mycotic Keratitis, an important ophthalmologic problem, especially among the outdoor workers in the tropic regions, is frequently caused by filamentous fungi. Following trauma, a corneal ulcer developed in 3 male patients residing in rural areas of Sari. Traumatizing agents were likely paddy rice, soil and dust. Direct examination of all the corneal scrapings showed septate branched ...
Chemical cleansing by denture cleansers is the first choice for denture plaque control of tissue conditioners. This study evaluated the influences of denture cleansers on the surface quality of tissue conditioners by determining surface roughness and porosity. Three tissue conditioners (Hydro-Cast, SR-Ivoseal, Visco-Gel) and 3 types of denture cleansers (Pika [enzyme type], Polident [neutral pe...
The structure and visco-elastic properties of K2Te4O9 have been examined as a function of temperature, using neutron scattering and Brillouin light scattering, respectively. The neutron scattering data indicate that the coordination of tellurium by oxygen changes notably once the material is heated above the glass transition temperature. This and the associated decrease in elastic modulus are c...
Converged computations with the DEBS code indicate that, within the force-free resistive MHD model in a doubly periodic cylinder with perfectly conducting boundary conditions, the appearance of single-helicity or multihelicity states is determined primarily by the Hartmann number, and is relatively independent of the pinch parameter or the degree of field reversal. 1 Similarity Scaling in Visco...
Abstract The present paper analyzes an unsteady magnetohydrodynamic blood flow model of visco-elastic fluid through inclined porous stenosed artery with body acceleration and slip effect. Navier-Stokes equations have been used to describe the model. governing equation is solved by analytic method considering as incompressible, fluid, suspension RBC’s in plasma. Axial velocity, acceleration, rat...
in the present study, the effects of the acute and chronic oral administrations (po) of curcumin in the absence and presence of morphine and naloxone was investigated on the sensation of acute corneal pain in rats. acute corneal pain was induced by the local application of hypertonic saline (5 m nacl) on the corneal surface, and the number of eye wipes was then counted for 30 s. subcutaneous (s...
Quasi-static processes in nonlinear visco-elastic materials of solid-type are here represented by the system: σ −B(x) : ∂ε ∂t ∈ β(ε, x), −divσ = f , (∗) coupled with initial and boundary conditions. Here σ denotes the stress tensor, ε the linearized strain tensor, B(x) the viscosity tensor, β(·, x) a (possibly multi-valued) maximal monotone mapping, and f an applied load. Existence and uniquene...
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