Tweet

@JERMAG07

This Thread may be Removed Anytime!

Twitter may remove this content at anytime! Save it as PDF for later use!

More from @JoshuaCAgar

Joshua C. Agar

@JoshuaCAgar

11 Oct

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

Joshua C. Agar

@JoshuaCAgar

10 Oct

Kindly ask those "lolo" and "lola" giving anecdotes that "attest" the Marcos regime the year-by-year state of affairs during that period. Ask them the specifics, what specifically happened in '72, '77, '81, '83, 84', and '86.

That's how historiography establishes veracity.

If they can't provide any to establish the veracity of their narrative, then that points of view that they are presenting, like the other dramatis personae in the past making good light of themselves, will be rebuked, shunned, and reprimanded.

You could also ask your lolos and lolas about their knowledge of how government works, the separation of powers, their knowledge of the constitution.

Read 5 tweets

Joshua C. Agar

@JoshuaCAgar

9 Oct

For the sustained wind criteria in the placement of turbines, one can perform wind spectrum analysis (accurate but hard to interpolate and gather) or generalized extreme value analysis (up to the daily maxima).

Here is the GEV analysis of the weather stations across PH:

μ represents the base wind speed, which is the expected annual maximum. σ and ζ represents the steepness ("slope") of the extreme value function. The steeper the extreme value function, the higher the difference between annual max from historical max.

The goal in selecting optimal locations for wind turbines is to have a significant μ, but a lesser σ. However, even after this analysis, one must still project the wind spectra by the evaluation of the wind exposure, which is related to the topography and atmospheric boundaries.

Read 5 tweets

Joshua C. Agar

@JoshuaCAgar

9 Oct

These idiots who kept posting this misinformation, honestly.

You can't just install wind turbines anywhere you wish. Bicol peninsula is exposed to the full brunt of typhoon winds. The climate doesn't permit consistent wind power there.

Batanes has consistent strong winds, being also exposed on both sectors, however, one cannot simply install wind turbines there because of the strong annual and historical maximums (Odette - 306 kph; Ferdie - 275 kph).

Mindanao is relatively safe from typhoons, with Malaybalay and Gen. San. having historical maxima of less than 100 kph. However, winds are not consistently strong.

Read 6 tweets

Joshua C. Agar

@JoshuaCAgar

9 Sep

Comparison of the wind flow of a person wearing a face shield (top panels) and a person not wearing face shields (bottom panels). [Tested a bit of stream tracing to determine the motion of particles]

Evidently, the particles traced experienced massive loss of momentum due to face shields (from red to blue). The loss of momentum led to increase in concentration. Also noted were the persistence of eddies (unsteady vortices).

[Velocity Field].

Note that airborne particles tend to go from regions of high flow energy to regions were less flow energy. The low-energy region initially is situated at the back of the head. Introducing the face shield situates the said region near the face.

Read 10 tweets

Joshua C. Agar

@JoshuaCAgar

8 Sep

1. The face shield (used by medical professional on top of PPEs) in that study are different from the face shields that Filipinos are using.

2. The virus and the droplets evidently still lingered in the air pointed out by this study. (Probably waiting to be sucked by the suction mechanism brought by a person moving with face shields on)

3. Bartels et al. (2021) pointed out that even though barriers and shields protect people at initial impact of the emission, the droplets will linger for some time due to the constriction brought by the barriers/shields. The study also observed slow settling velocities.

Read 8 tweets

Share this page!

Joshua C. Agar

Try unrolling a thread yourself!

More from @JoshuaCAgar

Joshua C. Agar

Joshua C. Agar

Joshua C. Agar

Joshua C. Agar

Joshua C. Agar

Joshua C. Agar

Did Thread Reader help you today?

Like this author's thread?