INTRODUCTION A previous study has employed shear-wave ultrasound elastographic imaging to assess corneal rigidity in an ex-vivo porcine eye model. This study employs the same modality in vivo in a rabbit eye model in order to assess lens, ciliary body and total ocular rigidity changes following the instillation of atropine and pilocarpine. METHODS Ten non-pigmented female rabbits were examine...

Friction stir welding and tungsten inert gas welding techniques were employed to weld armor grade aluminum alloy to investigate the effect of welding processes on tensile behavior of weld joints. Tensile tests, Vicker microhardness tests and optical microscopy were performed on developed weld joints and base metal. Welding process influenced tensile behavior and microstructure of weld joints. F...

Parkinson’s disease is one of the most common movement disorders characterized by bradykinesia, rigidity, resting tremor and postural instability (Fahn, 2003). It affects nearly five million elderly people worldwide (de Lau & Breteler, 2006). As the population ages, the incidence and prevalence of Parkinson’s disease are expected to increase dramatically (Dorsey et al., 2007; Tanner & Goldman, ...

Mechanically sensitive nociceptor afferents were studied in a preparation of isolated skin from rat leg. Each neuron was studied while the skin was subjected to tensile and compressive loading. The experiment was designed to create highly uniform states of stress in both tension and compression. Tensile loads were applied by pulling on the edges of the sample. Applied loads were used to determi...

Rigidity investigations in virtual Lego models In this thesis, we investigate the potential improvement of the algorithms detecting rigid structures in virtual Lego models in the computer application Lego Digital Designer. First, the previously achieved results are presented. This mainly involves a heuristic triangle rigidity detection algorithm described in a Bachelor’s thesis. Then, the two t...

Compared to other fibrous materials, plant fibers can act as a reinforcement in plastics due their relatively high strength and rigidity, low cost, density, biodegradability, renewability. In this context, study examines the effect of particle size content white oak wood flour (Quercus laeta Liemb), obtained from its branches, on properties commercial polypropylene. Mexico, branches Quercus Lie...

Abstract Charged groups in pulp have been shown to enhance the tensile strength of paper produced from pulp. Oxygen delignification introduces charged and it is interest determine how should be distributed between cooking oxygen stage with respect mechanical properties. A number unbleached kraft cooked delignified pulps within a wide kappa range were refined, effects refining on morphology prop...

The tensile creep behavior is extremely important in crack prediction and stress analysis of concrete. The main objective is investigating the effects of the silica fume on the tensile basic creep of early-aged concrete. The effect of silica fume on tensile creep was studied using lever-type tensile creep tester. Silica fume amount by weight of total cementing material was 0%, 5%, 10% and 15%. ...

Wage rigidity – the observation that wages cannot be adjusted downwards – has important implications for labour markets and macroeconomic performance. Empirical evidence on the extent, causes and consequences of wage rigidity on the individual level is relatively scant, however. This Feature presents articles that apply a new methodology to estimate the incidence and extent of nominal and real ...

Based on the theoretical model of rigidity correlation method, the study on application was carried out with Chinese Liyuan face rockfill dam as example. The linear relation equations between the rockfill rigidity and density measured by pit method were established, and the regression performance and accuracy of rigidity correlation method were analyzed by calculating the inversion values of de...