Mascaras do Bem: An analysis of face-mask performance from a volunteer mask-making initiative in Ribeirao Preto, Brazil.
Public health in practice (Oxford, England)
Objectives: : This study examines the response of a group of volunteers in Ribeirao Preto, Brazil, as the city faced an unprecedented demand for face masks during the onset of the COVID-19 crisis in 2020. The performance of artisanal-produced masks was compared with industry equivalents.Study design: Case report with comparative testing.Methods: A comparison was made between two parallel projects that produced single-use masks for healthcare workers and reusable masks for the community. Mask samples were tested for filtration efficiency (FE) and breathability (pressure drop).Results: Results for FE averaged 40-60% for healthcare masks and 10% for community masks; both types of masks were tested for particle sizes of 0.3mum.Conclusions: While performance was inferior to standard comparators, the masks investigated in this study afforded a level of protection in the absence of alternatives, especially in non-aerosol generating contexts. The findings of this study are useful for communities with limited resources in other developing countries. In addition, insights can be gained from the experiences in Ribeirao Preto in terms of how to respond to future health emergencies.
View details for DOI 10.1016/j.puhip.2021.100094
View details for PubMedID 33585827
- Self-assembly for electronics MRS BULLETIN 2020; 45 (10): 807–14
Construction and validation of UV-C decontamination cabinets for filtering facepiece respirators
2020; 59 (25): 7585–95
We present evidence-based design principles for three different UV-C based decontamination systems for N95 filtering facepiece respirators (FFRs) within the context of the SARS-CoV-2 outbreak of 2019-2020. The approaches used here were created with consideration for the needs of low- and middle-income countries (LMICs) and other under-resourced facilities. As such, a particular emphasis is placed on providing cost-effective solutions that can be implemented in short order using generally available components and subsystems. We discuss three optical designs for decontamination chambers, describe experiments verifying design parameters, validate the efficacy of the decontamination for two commonly used N95 FFRs (3M, #1860 and Gerson #1730), and run mechanical and filtration tests that support FFR reuse for at least five decontamination cycles.
View details for DOI 10.1364/AO.401602
View details for Web of Science ID 000571482900014
View details for PubMedID 32902458
- Density Driven Placement of Sub-DSA resolution assistant features (SDRAFs) SPIE-INT SOC OPTICAL ENGINEERING. 2017
- Design method and algorithms for directed self-assembly aware via layout decomposition in sub-7 nm circuits JOURNAL OF MICRO-NANOLITHOGRAPHY MEMS AND MOEMS 2016; 15 (4)
Variability of Graphene Mobility and Contacts: Surface Effects, Doping and Strain
72nd Annual Device Research Conference (DRC)
IEEE. 2014: 199–200
View details for Web of Science ID 000346309800092