In order to accurately calculate the cross-sectional stresses and deflections of improved composite box girder with corrugated steel webs, control differential equations boundary conditions are established based on energy variational principle, taking into account effects web properties, shear lag, deformation. A cantilever is used as a numerical example. The influence width span ratio bending ...

There exist two fracture mechanisms in facesheets of sandwich composites consisting of the 08 and 908 plies, namely crack growth and crack blocking. The former is undesired since it may lead to failure of facesheets and even the core in sandwich composites. A shear-lag model is developed in this article and it gives a simple criterion governing these two mechanisms. It is established that, for ...

OBJECTIVES We sought to investigate wall shear rate (WSR) and brachial artery diameter (BAD) changes simultaneously and to determine whether any gender differences exist in arterial reactivity. BACKGROUND Wall shear rate/stress and arterial reactivity are rarely assessed at the same time. Furthermore, flow-mediated vasoconstriction has received less attention than flow-mediated vasodilation i...

Recently, Ultra-High Performance Concrete (UHPC) has attracted increasing attention in civil engineering. Numerous steel–UHPC composite structures have been constructed around the world. The proper consideration of shear-lag effect a significant influence on safety structures. In view ribbed slab structure (SU-RSCS) elastic stage, theoretical calculation model based bar simulation method is fir...

The suspension culture of cells at provides an opportunity to study the multicellular life at low cell densities. In our earlier work with the model eukaryote Dictyostelium discoideum, we argued that the familiar but not understood transition from slow-to-fast growth at low cell densities (lag-log transition) was a collective, Allee effect during which cells communicate their density to one ano...

Shift work misaligns the environment and the body's internal clock. A new study suggests that this 'social jet lag' can be remedied by a 'personalized schedule', an intervention that may help reduce circadian misalignment and pathologies in shift workers.

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