Can spot arsonists by their clothes; their actions prove that Citizenship Act is 1,000% correct: PM Modi

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.

New Delhi, Apr 3: Prime Minister Narendra Modi on Friday urged people to gather together for a unique exercise on April 5 at 9 pm to show they were together in the fight against coronavirus.

"On this Sunday, April 5, we will challenge the darkness of coronavirus threat together. On April 5, at 9 pm, I need your 9 minutes. At 9 pm, turn off all the lights in your houses and light a Diya, candle, torch or flashlight for 9 minutes at your doors, or balcony," Modi said.

The Prime Minister further said that this will send out a message that nobody among the 130 crore Indians is alone in this fight against the deadly infection.

"I have one more prayer to all of you, nobody has to gather at any place during this event. Everyone will light a Diya only at their doors, windows or balconies. The Laxman Rekha of social distancing must be followed," Modi said.
Earlier, the Prime Minister had said that 130 crore Indians are together in this fight against coronavirus and praised the countrymen for following the lockdown.

"Today when crores of people are inside homes, then some of us may think how will they fight this battle against COVID-19 alone. Such questions might come up in your mind? But please remember, none of us is alone. The strength of 130 crores of Indians is with each one of us," he said.

He also expressed gratitude towards countrymen for participating in 'Janata curfew' on March 22 and said it has become "an example for all countries" today as they are following it.

In his address to the nation on March 24, the Prime Minister had announced a 21-day lockdown in the country to contain the spread of novel coronavirus, which has infected over 2,000 people in the country.

During the last "Mann Ki Baat" on COVID-19 related issue, the Prime Minister had apologised to the countrymen for taking the tough decision of enforcing complete lockdown in the nation. "My conscience says you will forgive me," he had said.

New Delhi, Jan 18: Asha Devi, the mother of the 2012 Delhi gang-rape victim, on Saturday slammed senior lawyer Indira Jaising for her suggestion that she should forgive her daughter's rapists.

"Who is Indira Jaising to give me such a suggestion? The whole country wants the convicts to be executed. Just because of people like her, justice is not done with rape victims," Asha Devi said here.

"Cannot believe how Indira Jaising even dared to suggest this. I met her many times over the years in Supreme Court, not even once has she asked for my well being and today she is speaking for the convicts. Such people earn their livelihoods by supporting rapists, hence rape incidents do not stop," she added.

Asha Devi further accused Jaising of using "the garb of human rights" to make a living.

'People like her keep earning money under the garb of human rights. I do not need her suggestions... Just because of people who think like her incidents like rape keep happening, she is a disgrace to women," she said.

Earlier yesterday, Indira Jaising, through a tweet, had urged Asha Devi to forgive the perpetrators and had used the example of Congress interim president Sonia Gandhi, who had forgiven Nalini, one of the convicts who was given the death penalty by the courts.

"While I fully identify with the pain of Asha Devi I urge her to follow the example of Sonia Gandhi who forgave Nalini and said she did not want the death penalty for her. We are with you but against the death penalty," Jaising's tweet read.