objective: this study evaluated the influence of storage time on micro-shear bond strength of two self-etching materials to enamel and dentin. materials and methods: human third molar teeth were sectioned to 1.5 mm thick beams and randomly divided into 2 groups. in group i, se bond and in group ii, tri-s bond was used to bond a composite rod (ap-x) to each treated surface. specimens were prepar...

This paper presents an overview of Laser Shock Processing and then discusses how the process can be extended to treat fastener holes on aging aircraft. The process is used to treat localized fatigue-critical areas by developing deep residual compressive stresses to inhibit the initiation and propagation of fatigue cracks. This feature can be applied to fastener holes in aircraft structures to d...

One of the main causes behind the trade collapse of 2008-09 was a significant fall in the demand for durable goods. This paper develops a small country, overlapping generations model of international trade in which goods durability gives rise to a more than proportional fall in trade volumes, as observed in 2008-09. The model has three goods two durable, traded goods and one non-durable, non-tr...

Previous research has shown that the act of remembering can cause forgetting of related information which is known as retrieval-induced forgetting. This study investigates the durability of this inhibitory effect over time. The participants were 92 university students. Using a standard retrieval-practice paradigm, we manipulated the delay between retrieval-practice and a final category-cued rec...

Reduced treatability in heartwood can cause reduced retention and penetration of preservatives into heartwood. This can reduce the durability of heartwood compared to the treated sapwood. From an anatomical point of view, the factors which contribute to the lower treatability of heartwood include its high extractive content, high rate of aspirated pits, and smaller pore sizes. Generally, in woo...

Many wide-area storage systems replicate data for durability. A common way of maintaining the replicas is to detect node failures and respond by creating additional copies of objects that were stored on failed nodes and hence suffered a loss of redundancy. Reactive techniques can minimize total bytes sent since they only create replicas as needed; however, they can create spikes in network use ...