Om Birla elected as Lok Sabha Speaker

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 29: India recorded 19,459 new coronavirus cases and 380 deaths in the last 24 hours.

According to the Ministry of Health and Family Welfare on Monday, the total coronavirus cases in the country stands at 5,48,318 including 2,10,120 active cases, 3,21,723 cured/discharged/migrated and 16,475 deaths.

Maharashtra's COVID-19 count touched 1,64,626 and cases in Delhi have reached 83,077.

The total number of samples tested up to 28 June is 83,98,362 of which 1,70,560 samples were tested yesterday, as per the data provided by the Indian Council of Medical Research (ICMR). 

Mumbai, Jan 15: Michael Debabrata Patra took over as Deputy Governor of the Reserve Bank of India (RBI) on Wednesday.

He was an Executive Director of India's central bank before being elevated to the post of Deputy Governor.

An RBI release said that as Deputy Governor, Patra will look after Monetary Policy Department including Forecasting and Modelling Unit (MPD/MU), Financial Markets Operations Department (FMOD), Financial Markets Regulation Department.

He will also look after Market Intelligence (FMRD/MI), International Department (Intl. D), Department of Economic and Policy Research (DEPR), Department of Statistics and Information Management (including Data and Information Management Unit) (DSIM/DIMU), Corporate Strategy and Budget Department (CSBD) and Financial Stability Unit.

Patra, a career central banker since 1985, has worked in various positions in the Reserve Bank of India.

As Executive Director, he was a member of the Monetary Policy Committee (MPC) of RBI, which is invested with the responsibility of monetary policy decision making in India. He will continue to be an ex-officio member of the MPC as Deputy Governor.

Prior to this, he was Principal Adviser of the Monetary Policy Department, Reserve Bank of India between July 2012 and October 2014.

He has worked in the International Monetary Fund (IMF) as Senior Adviser to Executive Director (India) during December 2008 to June 2012, when he actively engaged in the work of the IMF's Executive Board through the period of the global financial crisis and the ongoing Euro area sovereign debt crisis.

The release said that his book "The Global Economic Crisis through an Indian Looking Glass" vividly captures this experience.

He has also published papers in the areas of inflation, monetary policy, international trade and finance, including exchange rates and the balance of payments.

A fellow of the Harvard University where he undertook post-doctoral research in the area of financial stability, he has a PhD in Economics from the Indian Institute of Technology, Mumbai.

He will hold the post for three years or until further orders. The post fell vacant after Viral Acharya resigned on July 23 last year.