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https://q-lab.com/documents/public/7e877944-fcfa-41e6-9a52-3de77c8a6d6d.pdf
outdoor sunlight to get a magic factor for convert-ing accelerated tester exposure hours into outdoor exposure years. Unfortunately, there is no math-ematically valid way to make such a calculation, because it runs counter to the most basic prin-ciples of accelerated weathering. (Not to mention that, by definition, the Langley refers only to the
https://uhs.berkeley.edu/coronavirus/contact-tracing-and-close-exposures
A close contact is anyone who was within 6 feet of an infected person for a total of 15 minutes or more over a 24-hour period, whether indoor or outdoor. An infected person can spread COVID-19 starting from 48 hours (or 2 days) before the person has …
https://www.q-lab.com/resources/faqs.aspx
How many hours in a Q-SUN Xenon Test Chamber or a QUV Weathering Tester equals a year of outdoor exposure? This is a simple question, but unfortunately there is no simple answer. It is theoretically impossible to have a single magic number that you can multiply by weathering tester exposure hours to compute years of outdoor exposure.
https://www.energy.gov/sites/prod/files/2014/01/f7/pvmrw13_ps5_ise_koehl.pdf
7 Modeling expected degradation for validation by outdoor exposure Power reduction after 3 years outdoor exposure < 3% Exposure time has to be doubled Equivalent to 3 years operation 1,1 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0 20 40 60 80 C B A 100 -500 0 500 1000 1500 2000 2500 3000 3500 4000 Activation energy [kJ/mol] Exposure time /h
https://www.mdanderson.org/cancerwise/what-counts-as-coronavirus-covid-19-exposure--how-does-contact-tracing-identify-who-has-been-exposed-to-covid-19.h00-159383523.html
This is considered exposure regardless of whether one or both parties were wearing a mask. Are the risks of COVID-19 exposure different between indoor and outdoor settings? Yes, but only by degree. Outdoors, your risk is a bit less, because you’re not in a confined area with poor air circulation.
https://www.paint.org/coatingstech-magazine/articles/analytical-series-principles-of-accelerated-weathering-evaluations-of-coatings/
A year exposure in south Florida provides ~6500 MJ/m 2 of total solar radiation (290–3000 nm) but the value at 340 nm is rarely reported. The translation of outdoor exposure times to equivalent accelerated weathering times is complex and will be discussed later in this article.
https://www.micomlab.com/blog/uv-testing/uv-testing-faqs/
For example, to assess the performance of anti-graffiti coatings, ASTM D6578 calls for 24 months outdoor exposure (Florida or Arizona exposure) or 2000 hrs of accelerated aging. In that case, they assume an acceleration factor of 8.8 (2 years (17520 hrs) / 2000 hrs)
https://www.finishing.com/24/01.shtml
Commonly known cycles using a Xenon-arc source (the closest match to natural sunlight) require 1500 hours to achieve the same amount of radiant exposure as 12 months exposure in Florida. Degradation amounts may or may not be similar.
https://www.radtech.org/proceedings/2008/papers/120.pdf
exposure at their outdoor test site in Miami, FL. Sample readings were taken at 12-month intervals for the first 2 years and every 6 months for the remainder of exposure. Field Lens Sampling: Collecting headlamps from used vehicles in Florida was the basis of this part of the study. The following steps were followed to collect and evaluate the ...
https://www.intertek.com/polymers/testlopedia/accelerated-weathering-by-quv/
Up to 20 test samples are mounted in the QUV and subjected to a cycle of exposure to intense ultraviolet radiation followed by moisture exposure by condensation. Various cycles are defined depending upon the intended end use application - for example, a typical cycle for automotive exterior applications would be 8 hours UV exposure at 70° C followed by 4 hours of …
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