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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.

Chennai, Mar 3: The Madras High Court has ruled that if a working woman gives birth to a child in the second delivery after twins in the first, she is not entitled to maternity benefits as it should be treated as third child.

"As per existing rules, a woman can avail such benefits only for her first two deliveries. Even otherwise it is debatable as to whether the delivery is not a second delivery but a third one, in as much as ordinarily when twins are born they are delivered one after another, and their age and their inter-se elderly status is also determined by virtue of the gap of time between their arrivals, which amounts to two deliveries and not one simultaneous act," the court said.

The first bench, comprising Chief Justice A P Sahi and Justice Subramonium Prasad stated this while allowing the appeal from Ministry of Home Affairs.

It set aside the order June 18 2019 order of a single Judge, who extended 180 days of maternity leave and other benefits to a woman member of the Central Industrial Security Force (CISF) under the rules governing the Tamil Nadu government servants.

The issue pertains to an appeal moved by the ministry, which contended that the leave claim is by a member of CISF to whom the maternity rules of Tamil Nadu would not apply.

She would be covered by the maternity benefits as provided under the Central Civil Services (Leave) Rules, the ministry said.

When the appeal came up for hearing, the bench said it found that a second delivery, which, in the present case, resulted in a third child, cannot be interpreted so as to add to the mathematical precision that is defined in the rules.

The admissibility of benefits would be limited if the claimant has not more than two children, the bench said "This fact therefore changes the entire nature of the relief which is sought for by the woman petitioner, which aspect has been completely overlooked by the single judge", the bench said.

New Delhi, Jan 5: Senior Congress leader P Chidambaram on Sunday sàid it was "shameful" that Sadaf Jafar, SR Darapuri and Pavan Rao were arrested by the Uttar Pradesh Police for violence without any evidence against them.

He also said that it was a shocking admission by the police that there is no evidence of their involvement.

"Sadaf Jafar, S R Darapuri and Pavan Rao Ambedkar released on bail after police ADMITTED no evidence of their involvement in violence. Shocking admission," he said on Twitter.

"If that were so, why did the police arrest them in the first place? And how did the Magistrate remand them to custody without looking at the evidence," he asked.
"The law says 'find evidence, then arrest'. The reality is 'first arrest, then search for evidence'. Shameful," Chidambaram tweeted.