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Application of bow tie analysis and inherently safer design to the novel coronavirus hazard.

ABSTRACT: This work involves the application of process safety concepts to other fields, specifically bow tie analysis and inherently safer design (ISD) to COVID-19. An analysis framework was designed for stakeholders to develop COVID-19 risk management plans for specific scenarios and receptor groups. This tool is based on the incorporation of the hierarchy of controls (HOC) within bow tie analysis to identify priority barriers. The analysis framework incorporates inherently safer design (ISD) principles allowing stakeholders to assess the adequacy of controls along with the consideration of degradation factors and controls. A checklist has also been developed to help stakeholders identify opportunities to apply the ISD principles of minimization, substitution, moderation, and simplification. This work also considers barrier effectiveness with respect to human and organization factors (HOF) in degradation factors and controls. This paper includes a collection of bow tie elements to develop bow tie diagrams for specific receptor groups and scenarios in Nova Scotia, Canada. The pandemic stage (At-Peak or Post-Peak) and its influence on different scenarios or settings is also considered in this work. Bow tie diagrams were developed for numerous receptor groups; bow tie diagrams modelling a generally healthy individual, a paramedic and a hair salon patron contracting COVID-19 are presented in this work.

SUBMITTER: Brown KR

PROVIDER: S-EPMC8247331 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Application of Process Hazard Analysis and Inherently Safer Design in Wood Pellet Production.

Project description:Wood pellets are a fuel used for heat and power generation. Wood pellets are manufactured from forest residues and byproducts of other sectors in the wood processing industry, such as sawmilling. Wood pellet production generates combustible wood dust, which presents the risk of fire and explosion. The objective of this research was to incorporate the principles of inherently safer design (ISD) for the management of combustible dust hazards associated with wood pellet production. Using bow tie analysis to explicitly consider ISD within process hazard analysis (PHA), ISD barriers were successfully identified, including the use of paved surfaces to store feedstock to minimize rocks entering the process and presenting a risk of ignition sources, the use of reduced-size silos to minimize the inventory and increase the turnover frequency, the removal of unnecessary or hazardous equipment, such as fans, following a redesign, and the relocation of hazardous equipment, such as cyclones, outside and away from personnel. A summary of example-based guidance for combustible dust hazards was collected to support additional ISD implementation within PHA as part of the process safety management (PSM). The research also highlights learnings for conducting virtual PHA workshops, as well as identifying opportunities for incorporating ISD within operating wood processing facilities through the incident investigation and risk assessment elements of PSM.

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Evolution of bow-tie architectures in biology.

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Project description:In classical electrodynamics, nanostructured graphene is commonly modeled by the computationally demanding problem of a three-dimensional conducting film of atomic-scale thickness. Here, we propose an efficient alternative two-dimensional electrostatic approach where all calculation procedures are restricted to the graphene sheet. Furthermore, to explore possible quantum effects, we perform tight-binding calculations, adopting a random-phase approximation. We investigate multiple plasmon modes in 20 nm equilateral triangles of graphene, treating the optical response classically as well as quantum mechanically. Compared to the classical plasmonic spectrum which is "blind" to the edge termination, we find that the quantum plasmon frequencies exhibit blueshifts in the case of armchair edge termination of the underlying atomic lattice, while redshifts are found for zigzag edges. Furthermore, we find spectral features in the zigzag case which are associated with electronic edge states not present for armchair termination. Merging pairs of triangles into dimers, plasmon hybridization leads to energy splitting that appears strongest in classical calculations while splitting is lower for armchair edges and even more reduced for zigzag edges. Our various results illustrate a surprising phenomenon: Even 20 nm large graphene structures clearly exhibit quantum plasmonic features due to atomic-scale details in the edge termination.

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Gated Bow-Tie Diode for Microwave to Sub-Terahertz Detection.

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