Ugly Congism: CM’s Dakshina Kannada visit exposes Cong workers’ indiscipline

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, Jan 17: The Supreme Court on Friday closed the monitoring of the killing of rationalist M M Kalburgi in 2015 in Dharwad.

A bench of Justices R F Nariman and S Ravindra Bhat noted that the charge sheet has already been filed and the matter was assigned to the sessions court. The court, however, noted two accused had absconded and could not be arrested till date, according to reports.

Senior advocate Devadatt Kamat, appearing for the Karnataka government, submitted that the High Court had also stopped monitoring of the matter.

The top court had in early last year directed that the Karnataka High Court's Dharwad bench to monitor the probe. The Karnataka police SIT, which investigated Gauri Lankesh case and filed the charge sheet, was allowed to take over the Kalburgi case.

Umadevi, in her 2017 plea, drew a parallel between Kalburgi's murder and killings of Narendra Dabholkar and Comrade Govind Pansare in Maharashtra and sought an SIT probe by a retired Supreme Court or a High Court judge. She urged the top court to monitor the probe till it reached its logical conclusion as there was no progress in the investigation conducted so far by the Karnataka police.

The court had earlier sought to know if there was a "common thread" in murder cases of Communist leader Pansare and rationalist Dabholkar in Maharashtra, and Kannada writer Kalburgi and journalist-activist Gauri Lankesh in Karnataka.

Jan 6: Senior Bharatiya Janata Party leader Subramanian Swamy on Sunday said the country's economy is not showing good signs though Prime Minister Narendra Modi has manifested tremendous leadership skills in fighting terror and in social welfare projects.

The fiscal decisions of the government have not yielded the desired results, the Rajya Sabha MP said here.

"Modi had shown tremendous leadership skill in fighting terror, in several social areas, micro areas like bringing toilets to every village home. But the economy is a complex system...," he said while taking part in a discussion.

While every minister is talking about a 5 trillion dollar economy by 2024, but the current GDP growth has to be multiplied in four years to achieve that, the former Union minister said.

He said, if wages are slashed as a measure to cope with the situation, labor will become cheap but that will also cut down the people's purchasing power triggering dip in demand, closing down factories and rise in unemployment.

"This is one problem for which you really need an economist," he said.

Swamy said in jest, "I think Modi has one problem with me. Not only I am an economist but also a politician."