'We Did Work, They Took Credit': Union Minister's Swipe at Arvind Kejriwal

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, Jun 19: RJD and AAP were not invited to the all-party meeting called by Prime Minister Narendra Modi on Friday to discuss the situation at the India-China border after 20 Indian soldiers were killed in a "violent face-off," leaving the parties fuming.

Top RJD leader Tejashwi Yadav criticised the government for not inviting the party to the meeting, asking on Twitter late Thursday night, "Just wish to know the criteria for inviting political parties for tomorrow's (Friday's) all-party meet on Galwan Valley. I mean the grounds of inclusion/exclusion. Because our party hasn't received any message so far."

AAP's Rajya Sabha leader Sanjay Singh joined the chorus, "there is a strange ego-driven government at the centre. AAP has a government in Delhi and is the main opposition in Punjab. We have four MPs. But on a vital subject, AAP's views are not needed? The country is waiting for what the Prime Minister will say at the meeting."

Sources said the government has set a criteria to invite only parties with five or more MPs in Parliament for the digital meet, where the Prime Minister will brief the top leaders of parties and hear their views on the way ahead. There are at least 27 parties in the Parliament, which have less than five members, while 17 have more than five members or more than five MPs.

Interestingly, RJD has five MPs in Rajya Sabha and its senior MP Manoj K Jha shared the Rajya Sabha website link on Twitter, which showed the party has five MPs. "We have not been invited and the government's bogus argument has been exposed," Jha said.

CPI leaders said General Secretary D Raja received a call from Defence Minister Rajnath Singh inviting him to the meeting and with a message that the Prime Minister's Office would coordinate but there was no follow-up after that.

"Exclusion of AAP and RJD in the all-party meet on a National debate does not augment well. AAP is ruling Delhi and has its CM. Why should people of Delhi be kept out in such an important debate on National integrity and Sovereignty?" former NCP MP Majeed Memon tweeted.

During the all-party meeting on COVID-19 too, the government had not called all parties with representation in Parliament to the all-party meeting in April and had set five MPs as a benchmark to be invited.

Raja had then written a letter to Modi demanding that the government should not get into "technicalities" and discuss the issue with all parties in Parliament.

Mumbai, Feb 6: The Reserve Bank of India, for the second straight time, on Thursday kept its key policy rate unchanged at 5.15 per cent, maintaining its accommodative policy stance as long as it was necessary to revive growth.

The central bank retained GDP growth at 5 per cent for 2019-20 and pegged it at 6 per cent for the next fiscal.

"Economic activity remains subdued and the few indicators that have moved up recently are yet to gain traction in a more broad-based manner. Given the evolving growth-inflation dynamics, the MPC felt it appropriate to maintain status quo,” the Monetary Policy Committee (MPC) said.

The six-member committee voted unanimously to hold rates, but also said that there is “policy space available for further action”.

Between February and October 2019, the RBI had reduced repo rate by 135 basis points.