Item
「富岳」飛沫拡散を計算 “座り位置”で飛沫5倍に(2020年10月13日) - "Tomitake" calculated that the depending on the position of the seat, the droplet could be 5 times more (October 13, 2020)
Title (Dublin Core)
「富岳」飛沫拡散を計算 “座り位置”で飛沫5倍に(2020年10月13日) - "Tomitake" calculated that the depending on the position of the seat, the droplet could be 5 times more (October 13, 2020)
Description (Dublin Core)
This is the news explaining how droplets travel and the risk of exposure.
スーパーコンピューター「富岳」を使った新型コロナ感染リスクの検証で、飲食店で隣同士に座って会話した場合は正面で会話するよりも5倍の飛沫（ひまつ）を浴びることが分かりました。 富岳が4人が飲食店で1分程度話をした場合を計算した飛沫の広がり方です。理化学研究所のチームリーダーを務める神戸大学の坪倉誠教授によりますと、感染者が横に座っていて話をした場合は、正面に座った場合の5倍の飛沫を受けることが分かりました。さらに、飛沫そのものも湿度が低ければ低いほど、下に落ちずに空中に漂う量が急激に増えることが分かりました。湿度30％の場合は、60％の場合の2倍以上の飛沫が1.8メートル先まで到達したということです。また、コンサートホールなどで、合唱をする場合は飛沫は直進するため前方の人ほどリスクが高まるほか、合唱で生まれた気流によって飛沫がより遠くまで届くということです。
In the verification of the risk of new corona infection using the supercomputer "Tomitake", it was found that when sitting next to each other at a restaurant and talking, they are exposed to five times as many droplets (himatsu) compared to when sitting and talking in front of each other.
“Tomitake” calculated how the droplets spread when four people talked at a restaurant for about one minute. According to Professor Makoto Tsubokura of Kobe University, who is the team leader of RIKEN, it was found that when an infected person sits next to an individual and talks, he/she is exposed to five times as many droplets as when he/she sits in front of him/her. Furthermore, it was found that the lower the humidity of the droplets themselves, the more the droplets will be floating in the air without falling down. At a humidity of 30%, more than twice as many droplets, compared to the humidity at 60%, reached 1.8 meters away. Also, when a choir is singing in a concert hall, the droplets go straight forwards and thus the risk increases for the person in front, and the airflow created by the chorus causes the droplets to reach farther.
スーパーコンピューター「富岳」を使った新型コロナ感染リスクの検証で、飲食店で隣同士に座って会話した場合は正面で会話するよりも5倍の飛沫（ひまつ）を浴びることが分かりました。 富岳が4人が飲食店で1分程度話をした場合を計算した飛沫の広がり方です。理化学研究所のチームリーダーを務める神戸大学の坪倉誠教授によりますと、感染者が横に座っていて話をした場合は、正面に座った場合の5倍の飛沫を受けることが分かりました。さらに、飛沫そのものも湿度が低ければ低いほど、下に落ちずに空中に漂う量が急激に増えることが分かりました。湿度30％の場合は、60％の場合の2倍以上の飛沫が1.8メートル先まで到達したということです。また、コンサートホールなどで、合唱をする場合は飛沫は直進するため前方の人ほどリスクが高まるほか、合唱で生まれた気流によって飛沫がより遠くまで届くということです。
In the verification of the risk of new corona infection using the supercomputer "Tomitake", it was found that when sitting next to each other at a restaurant and talking, they are exposed to five times as many droplets (himatsu) compared to when sitting and talking in front of each other.
“Tomitake” calculated how the droplets spread when four people talked at a restaurant for about one minute. According to Professor Makoto Tsubokura of Kobe University, who is the team leader of RIKEN, it was found that when an infected person sits next to an individual and talks, he/she is exposed to five times as many droplets as when he/she sits in front of him/her. Furthermore, it was found that the lower the humidity of the droplets themselves, the more the droplets will be floating in the air without falling down. At a humidity of 30%, more than twice as many droplets, compared to the humidity at 60%, reached 1.8 meters away. Also, when a choir is singing in a concert hall, the droplets go straight forwards and thus the risk increases for the person in front, and the airflow created by the chorus causes the droplets to reach farther.
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Screenshot
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YouTube
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Date Submitted (Dublin Core)
10/13/2020
Date Modified (Dublin Core)
10/14/2020
10/19/2020
Date Created (Dublin Core)
10/12/2020
This item was submitted on October 13, 2020 by Youngbin Noh using the form “Share Your Story” on the site “A Journal of the Plague Year”: http://mail.covid-19archive.org/s/archive
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