BACKGROUND The aim of this study was to construct an alternative classification system for occupational hand injuries based on etiologic mechanisms and to analyze the injury patterns resulting from various mechanisms. METHODS A retrospective analysis of patients operated between January 2005 and December 2007 in two hand surgery units staffed by a team of hand surgeons was made. The patient f...

Mainly composed of elastic materials, ship fenders are utilised on all kinds vessels for the protection berthing structures and prevention damage due to heavy crash loads. This study aims enhance deformation mode performance foam-filled under quasi-static dynamic loadings. Six models fender’s structure chosen simulation test. The examined crashworthiness parameters such as crushing force effici...

The aim of this paper is to investigate the energy absorption behavior some reticulated tubes with different auxetic and non-auxetic wall grid patterns. Re-entrant, arrow-head anti-tetrachiral were three types cellular patterns for tubes, conventional honeycomb pattern was used tubes. All designed specimens fabricated by laser rotary cutting machine on steel crushing tests performed a universal...

The effects of magnesium stearate, sodium lauryl sulphate (SLS) and talc as lubricants on some powder and tablet properties of silicified microcrystalline cellulose (SMCC) were studied. Single and binary blends of talc, magnesium stearate and SLS at 1% concentration were evaluated as flow modulators on SMCC. Influence of the lubricants on the powder and tablet properties of metronidazole was al...

The geographic mosaic theory of coevolution predicts 1) spatial variation in predatory structures as well as prey defensive traits, and 2) trait matching in some areas and trait mismatching in others mediated by gene flow. We examined gene flow and documented spatial variation in crushing resistance in the freshwater snails Mexipyrgus churinceanus, Mexithauma quadripaludium, Nymphophilus minckl...

Particle crushing dominates the deformation behaviour of granular materials under significantly high compressive and shear stress. A proposed constitutive model has been verified to predict crushing behaviour of granular materials with different crushability and adopted one kind of reference crushing stress. It is noted that no positive dilatancy of granular material in triaxial test occurs onc...

It is necessary to reduce the weight of components while maintaining or improving their mechanical properties withstand dynamic loads in lightweight structures. In this study, heat treatment and a trigger mechanism were implemented for thin-walled tube aluminium increase energy absorption reducing peak crushing force. Different geometries locations proposed deformation controlled manner, combin...

Here, we document in-vivo bite forces recorded from wild piranhas. Integrating this empirical data with allometry, bite simulations, and FEA, we have reconstructed the bite capabilities and potential feeding ecology of the extinct giant Miocene piranha, Megapiranha paranensis. An anterior bite force of 320 N from the black piranha, Serrasalmus rhombeus, is the strongest bite force recorded for ...

The ability of a certain genotype to express different phenotypes depending on variations in the environment is called phenotypic plasticity. Predator induced defences are among the most studied and wide spread examples of phenotypic plasticity. For example, in freshwaters, predators are constantly shaping communities with their presence and a plethora of defensive adaptations in prey have evol...