Size-specific filtration efficiency and pressure drop of school-aged children's woven and nonwoven masks at varying face velocities.

Background: Differences in physiology and breathing patterns between children and adults lead to disparate responses to aerosols of varying sizes. No standardized method exists for measuring the filtration efficiency (FE) of children's masks to reflect such differences.

Methods: Using an adult N95 mask as a control and two different face velocities (v) (9.

Size-Specific Filtration Performance of N95 Respirators After Decontamination by Moist Heat Incubation.

Decontamination and reuse of respirators have been proposed to mitigate the shortage of respirators during pandemics. The U.S.

In situ measurement of dental resin-based composite volumetric shrinkage and temperature effects using in-fibre bragg grating methods.

Objectives: Resin-based composites (RBCs) are commonly used in dental restorations. It is known that RBCs undergo volumetric shrinkage during photo-polymerization leading to a detrimental increased stress state at the RBC-tooth interface and potentially early restoration failure. The objectives of this in vitro study were: (1) to ascertain whether shrinkage strain could be measured using in-fibre Bragg grating (FBG) technology, without confounding effects of temperature; and (2) to ascertain whether FBGs can detect alteration in shrinkage strain with introduction of a surface condition change at the RBC-cavity analog interface.