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Paul Hewett

Researcher at National Institute for Occupational Safety and Health

Publications -  12
Citations -  210

Paul Hewett is an academic researcher from National Institute for Occupational Safety and Health. The author has contributed to research in topics: Geometric standard deviation & Confidence interval. The author has an hindex of 9, co-authored 12 publications receiving 206 citations.

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The particle size distribution, density, and specific surface area of welding fumes from SMAW and GMAW mild and stainless steel consumables

TL;DR: The mass distributions for all four consumables were unimodal and well described by a lognormal distribution; with the exception of the GMAW-MS and GMAw-SS comparison, they were statistically different.
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Simple Procedures for Calculating Confidence Intervals around the Sample Mean and Exceedance Fraction Derived from Lognormally Distributed Data

TL;DR: In this article, simplified procedures for calculating accurate estimates of the 95 percent lower confidence limit and 95 percent upper confidence limit for (1) the sample arithmetic mean, and (2) sample exceedance fraction for lognormally distributed exposure data are introduced.
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Estimation of regional pulmonary deposition and exposure for fumes from SMAW and GMAW mild and stainless steel consumables

TL;DR: The particle size distributions and bulk fume densities for mild steel and stainless steel welding fumes generated using two welding processes were used in mathematical models to estimate regional pulmonary deposition and regional pulmonary exposure and it is likely that for equal exposure concentrations GMAW fumes deliver nearly three times the particle surface area to the lungs as S MAW fumes.
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Mean Testing: I. Advantages and Disadvantages

TL;DR: Do long-term occupational exposure limits (LTA Oels) exist?
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A model for correcting workplace protection factors for lung deposition and other effects

TL;DR: The adjusted WPF, WPFa, is then calculated as the ratio of the measured ambient contaminant concentration and the adjusted in-facepiece concentration.