PM Modi emerges most popular leader on Instagram

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.

Washington, Jul 18: The Foreign Direct Investment (FDI) from the US to India has crossed the $40 billion mark so far this year, reflecting the growing confidence of American companies in the country, the head of an India-centric business advocacy group has said.

The American companies, during the Covid-19 pandemic, which has battered the world economy, have shown great confidence in India and its leadership, said Mukesh Aghi, president of the US-India Strategic and Partnership Forum (USISPF), which keeps a track of the major US FDIs in India.

“Year to date investment from the US, including the recent ones, is over $40 billion,” Aghi said.

In recent weeks alone, the announcement of the FDI into India has been over $20 billion, he said, referring to the announcements made by some of the top companies like Google, Facebook and Walmart.

“Investors’ confidence in India is high. India still remains a very promising market for global investors. If you look at the $20 billion… not just the US, but (investment) has also come from other geographies such as the Middle East and the Far East.

“So, India still remains a very, very bullish market for the investor community,” Aghi said in response to a question.

The USISPF has been working with New Delhi to bring in FDI into India… playing a key role in encouraging American companies planning to move their bases out of China, he said, adding that the move was going on in the last three years of the Trump administration, but gained momentum during the coronavirus pandemic.

“We feel that Prime Minister (Narendra Modi’s) intention is very high. The challenges lie on the execution side. Efforts are being made to encourage manufacturing… I've never seen it so better. The policy framework is moving in the right direction,” he said.

Early this week, Larry Kudlow, the White House Economic Advisor, told reporters that the US tech giants like Google and Facebook announcing big investments in India shows that people are losing trust in China and India is emerging as a big competitor.

At the same time, he rued that India continues to be a protectionist country.

“The question is how do you define protectionism... the administration here is saying America first and India is saying vocal for local…,” Aghi added.