SARS and masks

Use of disposable face masks for public health protection against SARS.

The paper by Syed et al, 1 provides observations on the use of face masks by members of the public for protection against the severe acute respiratory syndrome (SARS) corona-virus (CoV). The authors' raise an important question as to whether masks are effective in preventing disease. The type of masks used can generally be categorised as either surgical or paper and are suggested to offer simil...

Efficacy of 3-Layer Felt Masks Containing Polypropylene Membranes in Particle Filtration with SARS-CoV-2 Size Range

Background and Aim: The use of a mask is an effective measure to reduce the transmission of Covid-19. Today, due to the lack of N95 masks and medical masks with good performance, felt masks are widely used due to their ease of manufacture and low cost. The aim of this study was to determine the effectiveness of 3-layer felt masks containing polypropylene membranes in filtering particle size in ...

Ritual, Masks, and Sacrifice

INTRODUCTION Ritual is intimately connected with the mask, either in the wearing that hides the true face, or in the adoption of a public face. The mask makes the disengagement from ordinary time and the connection to the ancient and repetitive, which is the heart of ritual, psychologically acceptable. Together, ritual and mask facilitate the apprehension of identity and its connections with pa...

SARS diagnosis, monitoring and prognostication by SARS-coronavirus RNA detection.

Notch Filter Masks: Practical Image Masks for Planet-Finding Coronagraphs

An ideal coronagraph with a band-limited image mask can efficiently image off-axis sources while removing identically all of the light from an on-axis source. However, strict mask construction tolerances limit the utility of this technique for directly imaging extrasolar terrestrial planets. We present a variation on the basic band-limited mask design—a family of “notch filter” masks—that mitig...