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Joshua C. Agar Profile picture
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Jan 30 • 7 tweets • 2 min read
A bit of a brief explanation about the physics of Covid-19 transmissions (a thread)

#CovidisAirborne #CovidisAirbornePH
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More from @JoshuaCAgar

Joshua C. Agar Profile picture
Feb 1
Since @EdselSalvana is deleting his comments in an attempt to gaslight people after being called-out, here is the blow-by-blow sequence of what happened (a thread):
It all started with @EdselSalvana sharing this post last Saturday morning:
As cramming my slides and desire to prove my competency on my field of research, I asked @EdselSalvana if he shared the same sentiment whether he’ll offer an explanation that he owed to the public. He simply said that such act is just the public being lazy about it
Read 25 tweets
Joshua C. Agar Profile picture
Jan 8
Admittedly there's a research gap concerning face shields since they are mainly intended for hospital settings, hence scenarios limited to hospital settings. The general consensus is that face shields are intended for ballistic droplets, not for aerosols.

Below are the studies:
Lindsley et al. (2014). Efficacy of Face Shields Against Cough Aerosol Droplets from a Cough Simulator

Face shields are evaluated to stop the initial impact of the cough which brought heavy droplets, however, airborne droplets still make way around.

ncbi.nlm.nih.gov/pmc/articles/P…
Akagi et al. (2020). Effect of sneezing on the flow around a face shield. Phys. Fluids 32. doi:10.1063/5.0031150

A numerical simulation of a sneeze on a face shield, showing that transient effects actually directs aerosols inside even during impact.

aip.scitation.org/doi/10.1063/5.…
Read 21 tweets
Joshua C. Agar Profile picture
Oct 12, 2021
And as it turns out, the initiative of exploring the potential for wind power that led to the wind farms in Ilocos Norte...

...came from USAID!

The Marcoses have been consistent of grabbing credit from USAID!

Documentation of the Initiative:
nrel.gov/docs/fy02osti/…
The study of compiling the atlas for wind energy in the Philippines started in 1996. The atlas was finished at 2000:

(Lol. They indeed did GEV analysis and interpolated using the projected wind exposure parameters)
Bangui and Burgos became the ideal locations. Northwind invested on Bangui and First Gen invested on Burgos.
Read 4 tweets
Joshua C. Agar Profile picture
Oct 12, 2021
Re: Face shields on various scenarios (Another thread)

I was asked, in the spirit of the RCTs, whether I have explored the other scenarios concerning face shields.

Well, yes, I did.
The intervention of face shields against sporadic emissions at different angles of attack was simulated and observed, and as it turned out that the ballistic protection only applies for emissions coming from the front. From other angles, risk increases:

The speed of cough simulated was 50 mph. Here, it was illustrated how the momentum of the emission decreases over distance, while also noting the advection also:

Read 10 tweets
Joshua C. Agar Profile picture
Oct 12, 2021
Misinformation and falsehoods cascade across three layers:
First is with the perpetrators who spread disorienting misinformation in social media.

Second is with the media on which some are disoriented and pass on the disorientation to the masses.

Third is with the masses.
Indeed, the battleground may be dealing with the source. But the ripples of misinformation still trickled down to its main interest and intended audience: the masses.
Given that the surveys determined that mainstream media are still the main source of information of people, we look at media personalities who package their commentaries, which contained their personal biases, as if those were the news.
Read 6 tweets
Joshua C. Agar Profile picture
Oct 11, 2021
Debacle of face shields in the Philippines

(A thread)

I see that some of the scientists from other countries are considering recommending face shields to be worn in public.

I beg to differ, presenting how face shields represented the poorest pandemic response in the world.
December 11, 2020

The Inter-Agency Task Force (IATF) against Covid-19 of the Philippine Government, through its Resolution no.88, mandated the use of face shields even in public, outside of hospital settings.
pna.gov.ph/articles/11544….
The technical advisory body of the IATF, spearhead by infectious disease experts Dr. Anna Lisa Ong-Lim and Dr. Edsel Salvana claimed that a randomized control trials (RCT) conducted in the public hospitals and another performed in India reported 90% efficacy rate.
Read 31 tweets

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