Dr. Richard Corsi (@CorsIAQ )

Dr. Richard Corsi

Bio Dean, Maseeh College of Engineering & Computer Science, Portland St Univ., and Joe J. King Chair Emeritus of Engineering #2, Univ of Texas at Austin
Location Portland, OR
Tweets 10,2K
Followers 11,7K
Following 977
Account created 24-07-2013 22:18:19
ID 1618718016

Twitter Web App : Posters made by wonderful staff on my last day as Chair of UT Austin CAEE in 2017. Images w/ assistant professors and staff members. The diet and musical tastes were and remain spot on.

Twitter Web App : The "Field of Flags" representing those who have died of COVID-19 in 50 States and US territories is incredibly poignant. And that immense mall of flags is only 1/2 the number of Americans who have died of COVID-19 as of today, January 18 2021. twitter.com/aterkel/status…

Twitter Web App : Today we honor a man whose legacy, sacrifices, and passion changed the world forever. You will never be forgotten 🙏❤️

Our lives begin to end the day we become silent about things that matter - Dr. Martin Luther King Jr.
#MLK #martinlutherkingjr #ihaveadream

Twitter Web App : The effects of this virus do not necessarily stop for those hospitalized and "recovered". Wear a mask, distance, increase ventilation, & where possible improve filtration (including portable HEPA) and/or employ UVGI. Visit only essential indoor environments & minimize time there. twitter.com/DrEricDing/sta…

Twitter Web App : As you honor my father today, please honor my mother, as well. She was the architect of the King Legacy and founder of The Martin Luther King, Jr. Center, which she founded less than three months after Daddy died. Without #CorettaScottKing, there would be no #MLKDay. #MLK  #BelovedCommunity

Twitter Web App : Dr. Laura Nissen Little doubt that we will exceed it. Of course, we have over 3 x as many Americans now. On the flip side, it is difficult to believe that w/ tech advances and lessons learned along the century that we did so damn poorly 100 years later. What would futurists have predicted then?

Twitter Web App : La position du Québec à ce sujet n'est pas seulement ridicule, elle est aussi terriblement irresponsable. Des purificateurs d'air HEPA portables de taille appropriée peuvent réduire considérablement les particules d'aérosol chargées de virus dans les écoles. twitter.com/DavidElfstrom/…

Twitter Web App : 👇Interdisciplinary collaboration as well as collaboration across the academic & applied domains is the only way we’re going to be able to address the many challenges we face as a species. twitter.com/corsiaq/status…

Twitter Web App : 12/ Also, if everyone in the vehicle wears masks the intake fraction is reduced on two fronts, less emissions from the infector and less inhalation of virus-laden particles by receptor. To be included in blog. Just do it!

Twitter Web App : 11/ Until then, I have posted some old handwritten course notes on intake fraction at corsiairquality.files.wordpress.com/2020/10/intake…

Apologies for sloppy writing. Enjoy the analogy of candles vs power plants in terms of inhalation of fine particles. Candles 👎. I know, different compositions.

Twitter Web App : 10/ I am working on a blog related to the use of intake fraction as a conceptual and quantitative tool for assessing indoor environments where exposure to SARS-CoV-2 may occur.

Twitter Web App : 9/ For the very special case of an inert pollutant (non-reactive and not removed by controls or surfaces) at steady-state IF = respiratory minute volume / volumetric flow of outdoor air through indoor space. IF = Qb/Qv

Twitter Web App : 8/ Note that for large outdoor sources of pollution (think busy highways, power plants) with a receptor on the order of hundreds of meters to kilometers downwind the IF is typically on the order of 1 billionth to 1 trillionth.

Twitter Web App : 7/ In this analysis the IF ranges from approx 0.01 to 0.1. For a wide range of indoor spaces in buildings IF ranges from 0.0001 to 0.001. Intake fraction can be lowered w/ higher ventilation and/or better filtration (including portable HEPA filters), as well as UVGI for virions.

Twitter Web App : 6/ An important point is that the intake fraction is not dependent on the amount emitted, and so the value is applicable to whatever the number of particles (or virions in particles) are being shed by an infector. Emission rate can be multiplied by IF to get at inhalation dose.