Accept Rs 700-cr from UAE or compensate us: Flood-ravaged Kerala tells Modi govt

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.

Mangaluru, Jan 11: A large number of people from the Women India Movement on Saturday staged a protest against the Citizenship Amendment Act (CAA) and the National Register of Citizens (NRC) here and raised slogans denouncing the newly enacted law.

Protestors were seen carrying placards that read, 'Stop diving India, Boycott CAA, NRC, NPR', 'We are humans, not criminals', 'Save India from fascism'.

"Today's youths are tomorrow's future. The present leaders are scared by the youths and are trying to wipe us out. They are scared of the students because they are raising their voices," a protestor told media.

"It started with the triple talaq, then the removal of Article 370 and Babri Masjid verdict. We Muslims kept quiet but now it is a question to our Constitution. We are not here as Muslims but as an Indian Citizen protesting against the cruelty of the BJP government," she added.

The protestor said the Central government is trying to make India a Hindu Rashtra by wiping out all other communities.

"This fascist government is trying to poison the minds of Hindus against the Muslims. After Muslims, there will be the Christian community and then other communities. The main motive of the government is to only keep Brahmins in India," added the protestor.

The newly-enacted law grants citizenship to Hindu, Sikh, Jain, Parsi, Buddhist, and Christian refugees from Pakistan, Afghanistan, and Bangladesh, who came to India on or before December 31, 2014.

New Delhi, Feb 20: The Supreme Court on Thursday stayed the non-bailable warrants issued against the state Director General of Police (DGP) and Inspector General of Police (IGP) by the Karnataka High Court.

A bench of Chief Justice SA Bobde stayed the non-bailable warrants while hearing a plea filed by the Karnataka government.

Earlier today, the apex court had agreed to hear the matter today itself after Solicitor General Tushar Mehta mentioned the matter before it.

Tushar Mehta had pointed that Home Secretary has been asked by the High Court to execute the non-bailable warrants and said that this order is "unusual".

Karnataka High Court had earlier issued non-bailable warrants against the top cops in a case.