PURPOSE This study compared the measurements of intraocular pressure (IOP) and ocular pulse amplitude (OPA) using the Dynamic Contour Tonometry (DCT) over silicone hydrogel contact lenses of different modulus. Corneal biomechanics were also measured using the Ocular Response Analyzer (ORA). METHODS Forty-seven young (mean age 22.3 years, standard deviation 1.2 years) subjects had IOP, OPA, co...

the rheological properties of four different kuwaiti crude oils in the presence of polyacrylamide (paa) were investigated. paa was varied at three different concentrations of 25, 50, and 75 ppm to study the viscoelastic properties in the untreated samples. four different temperatures (25, 30, 35, and 40 °c) were used to evaluate different viscoelastic parameters of the treated and untreated kuw...

abstract: for many years, the wood of walnut tree (juglans regia) has been used for making santur. even though artisans have their own divers’ ideas about this species’ features; until now there has been no scientific data to support them. in santur’s case specially, differently cut surface plates can be formed into final instrument. besides, some steam treatments, which supposedly improve the ...

The study presented here aims at evaluating the bulk elastic Young modulus of six different concrete mixes as a function of the water content and degradations due to carbonation or chloride ingress. The frequency analysis of ultrasonic waves in concrete after the impact of a steel ball (impact echo method) is commonly used to measure the thickness of large slabs, to detect voids in concrete str...

Probabilistic fracture analysis is performed for predicting uncertain fracture responses of Functionally Graded Material (FGM) structures. The uncertainties in material properties including Young's modulus and fracture toughness are considered. The limit state function for a crack initiation event is defined in terms of the J-integral for FGMs. The First-Order-ReliabilityMethod (FORM) is used i...

Objective(s): Application of eco-friendly materials like poly lactic acid (PLA) is increasing, to reduce environmental pollutions. In this research, the effect of silicon dioxide 1%, 3% and 5% nanoparticles on morphological, mechanical and chemicals interaction (FTIR) of PLA film was studied. Materials and Methods: Scanning electron microscope (SEM) was used, ...

The electronic band structure and elastic properties of the Cd16Se15Te solid state solution in framework density functional theory calculations are investigated. sample is constructed on original binary compound CdSe, which crystallizes cubic phase. Based structure, effective mass electron, heavy hole, light spin-orbit masses reduced G point calculated. In addition, exciton binding energy, refr...

Mechanical modelling using the level-cut Gaussian random field approach has been employed to simulate effect of radiation induced amorphization on Young´s modulus, Poisson´s ratio and hardness zircon (ZrSiO4). A good agreement with previous nanoindentation experiments achieved. Two percolation transitions occur at ~16% ~84% amorphous volume fraction, leading deviations from linearity in evoluti...