objectives: this study aimed to assess the effect of re-etching of desensitized dentin for five and 10 seconds on marginal microleakage of composite restorations. materials and methods: class v cavities (4x2x2mm) were prepared on the buccal surfaces of 64 third molars and randomly divided into four groups of 16. in the control group, single bond (sb) adhesive was applied after etching. in bb+sb...

Probabilistic risk assessment (PRA) is an important tool in assessing the safety of a nuclear power plant. Probabilistic approach allows the selection of plant modifications which efficiently decrease the plant total risk. Optimal decision making requires that the plant is modelled as accurately as possible. A single risk factor should not be underestimated or exaggerated. This thesis presents ...

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The paper gives a coherent account of the theory of d i s loca t ion mobil i ty i n terms of kink-pair formation and kink migration. Three leve l s of descr ip t ion a r i s e i n a n a t u r a l way, namely those of the motion of s t r a i g h t d i s loca t ions , of kink-pair formation on d i s loca t ions , and of kink migration. The i n t e r r e l a t i o n s h i p s between these leve l ...

Used as a hardening agent in lead bullets, antimony (Sb) has become a major contaminant in shooting range soils of some countries including Switzerland. Soil contamination by Sb is also an environmental problem in countries with Sb-mining activities such as China and Bolivia. Because of its toxicity and relatively high mobility, there is concern over the risk of Sb transfer from contaminated so...

IRSN has carried out a State-of-the-Art-Review of the main experimental programmes related to fuel behaviour under Loss-of-Coolant-Accident (LOCA) conditions conducted from the 70s until now, that has been split in three parts. The second part is devoted to the question of the coolability of blocked regions in a rod bundle after ballooning in a LOCA. The main findings from this part are present...