Don’t blame minority Brahmins for past ‘tragedies’: Pejawar seer

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, Feb 23: Dreaded underworld don Ravi Pujari, operating from overseas, has been reportedly arrested in South Africa and efforts are on for his deportation to India.

Pujari, who parted ways with underworld don Chhota Rajan, had jumped bail from Senegal, last year and had escaped to South Africa, where he was involved in big-time drug trafficking and extortion racket.

Sources in Indian Intelligence said that Ravi Pujari, who was hiding with a false identity of Anthony Fernandes, a Burkina Faso passport holder, was located in a remote village in South Africa.

On a tip-off from Indian external intelligence agency, the Senegal police air dashed South Africa last week. Pujari, 52, wanted in over 200 cases of heinous crimes, including murder and extortion, was detained with the help of South African agencies.

Sources in Mumbai Police said that Pujari's arrest has not yet been confirmed officially but Ministry of External Affairs is in touch with its mission in South Africa. An official in MEA refused to speak on the issue. Embassy of Senegal in Vasant Vihar, New Delhi, also did not respond to IANS' queries in connection with Pujari's arrest.

The mafioso first came into news in early 2000 when he started extorting huge amounts from famous Bollywood personalties and builders. He was involved in an attempt to murder case, aimed at killing a prominent lawyer of Mumbai.tip-off

Pujari's wife Padma and three children also fled India and some of them hold Burkina Faso passport. His son who was recently married in Australia reportedly holds an Australian passport.

Earlier last year Ravi Pujari, living under the identity of Anthony had jumped bailed from a Senegal court through fraudulent means. IANS had accessed the don's new passport. Pujari now goes under the name of Anthony Fernandes and is a citizen of Burkina Faso, a West African country, his date of birth is shown as 25.1.1961.

Pujari, a movie junkie influenced by Amitabh Bachchan's portrayal as Anthony Gonsalves in 'Amar Akbar Anthony' was using the name, Anthony Fernandes. This passport was issued on 10.7.2013 and is valid till 8.7.2023. The passport showed his profession as Agent Commercial which means that he is designated as a businessman running a chain of restaurants Namaste India in Senegal, Burkina Faso and neighbouring countries.

Pujari's lawyers in Senegal had argued in the court citing that he is Anthony Fernandes, a businessman from Burkina Faso as mentioned in his passport and not a fugitive as claimed by the Indian Government.

Clearly indicating a collision between top government functionaries of Burkina Faso and Pujari in which an influential Indian businessman, who is his partner in a restaurant chain, may have played the role of a conduit.