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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 11: The Aam Aadmi Party on Tuesday appeared to be heading back to power for a second term in Delhi with the party leading in 52 seats of the 70 and the BJP ahead in 18 as votes for last week's assembly elections were counted, according to Election Commission figures. The contest for political power over the national capital was a bipolar one with the Congress nowhere in the reckoning, according to initial trends.

AAP supremo and chief minister Arvind Kejriwal was leading in the New Delhi seat by 4,300 seats, while his deputy Manish Sisodia from Patparganj seat was ahead by 102 votes.

BJP leader Vijender Gupta, who is also leader of opposition in the Delhi legislative assembly, was trailing by over 1,200 votes from Rohini.

As early celebrations broke out in the AAP headquarters in Rouse Avenue, BJP's Delhi unit chief Manoj Tiwari asked his party supporters not to lose hope.

"There are 27 seats where the difference of votes is between 700 to 1,000," Tiwari told reporters.

Looking ahead at victory, he said he was not nervous and was ready to take on the responsibilities that a win would bring.

"All talk is over. We have to wait for the blessings of the people. I am confident it will be a good day for BJP. We are coming to power in Delhi today. Don't be surprised if we win 55 seats," Tiwari said.

Kejriwal, who had led his party to a spectacular win of 67 of 70 seats in 2015, is expected to address party workers and the media later in the day. However, his party workers were upbeat and in celebratory mode.

"We have been saying since the beginning that the upcoming polls will be fought on the basis of work done by us... You wait and watch, we will register a massive win," AAP spokesperson Sanjay Singh told reporters.

"We hope we get such a clear majority that a message goes out that doing Hindu-Muslim politics will not work anymore," said AAP volunteer Fareen Khan at the party office.

The headquarters were decorated with blue and white balloons and big cutouts of Kejriwal were placed in different parts of the office.

Labour minister and AAP's Delhi unit convenor Gopal Rai was leading in Badarpur constituency by 1,994 votes.

Atishi, AAP's Kalkaji candidate, who was also instrumental in the transformation of Delhi government schools, was trailing by 190 votes.

AAP's Timarpur candidate Dilip Pandey was leading by over 1,500 votes.

BJP's Tajinder Singh Bagga was trailing on Hari Nagar seat by over 50 votes, while AAP's Raghav Chadha is leading from Rajinder Nagar constituency.

Congress' Chandni Chowk candidate Alka Lamba, who is sitting MLA from the constituency, was trailing by over 5,800 votes.

Counting centres are spread across 21 locations in 11 districts, including at the CWG Sports Complex in east Delhi, NSIT Dwarka in west Delhi, Meerabai Institute of Technology and G B Pant Institute of Technology in southeast Delhi, Sir CV Raman ITI, Dheerpur in central Delhi, and Rajiv Gandhi Stadium in Bawana in north Delhi.

The assembly elections were held on February 8.

A total of 672 candidates, including 593 men and 79 women, were in the fray for the hotly contested, often divisive polls with the anti-CAA protests in Shaheen Bagh occupying centrestage towards the end of the campaign.

While the AAP, of course, put forward Kejriwal, Prime Minister Narendra Modi, home minister Amit Shah and Uttar Pradesh chief minister Yogi Adityanath were among those who extensively campaigned for the BJP.

The Congress, still recovering maybe from the death of its three-time Delhi chief minister Sheila Dikshit in July last year, got into campaign mode much later. Former prime minister Manmohan Singh and party leaders Rahul Gandhi and Priyanka Gandhi were among those who campaigned for the Congress.

New Delhi, Jan 5: A masked mob on Sunday entered the Sabarmati Hostel on the Jawaharlal Nehru University (JNU) campus and assaulted several students and professors with sticks and rods.

"I have been brutally attacked by goons wearing masks. I am bleeding. I was brutally beaten up," JNU Students' Union (JNUSU) president Aishe Ghosh told reporters.

She has been admitted to the AIIMS here for treatment.

Several other students were also injured in the incident.

In a video of the incident, a group of goons with their faces covered can be seen assaulting students with wooden sticks and rods.

A tweet from the official handle of the JNUSU said, "Sabarmati Hostel: right now. They are beating the students who are inside. Knocking on doors with rods. People are jumping from balconies. #SOSJNU #EmergencyinJNU."

"Professors who were trying to protect us have been beaten up. These are unknown ABVP goons, not all are students, they have covered their faces, and they are moving towards the hotels near the West Gate. Stay alert. Make human chains. Protect each other. #SOSJNU #EmergencyinJNU," another tweet added.

Meanwhile, the ABVP's JNU unit claimed in a tweet: "Emergency in JNU. Leftist goons of JNU accompained with their cadre from other universities have crossed every limit. They have proceeded with unimaginable violence on ABVP activists of JNU."