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Washington, Feb 21: Days ahead of his India visit, US President Donald Trump on Thursday said the two countries could make a "tremendous" trade deal.

"We're going to India, and we may make a tremendous deal there," Trump said in his commencement address at the Hope for Prisoners Graduation Ceremony in Las Vegas.

Trump, accompanied by First Lady Melania Trump, is scheduled to travel to Ahmedabad, Agra and New Delhi on February 24 and 25.

Ahead of the visit, there have been talks about India and the United States agreeing on a trade package as a precursor to a major trade deal.

During his commencement address, Trump indicated that the talks on this might slowdown if he did not get a good deal.

"Maybe we'll slow down. We'll do it after the election. I think that could happen too. So, we'll see what happens," he said.

"But we're only making deals if they're good deals because we're putting America first. Whether people like it or not, we're putting America first," Trump said.

Bilateral India-US trade in goods and services is about three per cent of the US' world trade.

In a recent report, the Congressional Research Service (CRS) said the trading relationship is more consequential for India -- in 2018 the United States was its second largest goods export market (16.0 per cent share) after the European Union (EU, 17.8 per cent), and third largest goods import supplier (6.3 per cent) after China (14.6 per cent) and the EU 28 (10.2 per cent).

"The Trump Administration takes issue with the US trade deficit with India, and has criticised India for a range of 'unfair' trading practices," the CRS said.

"Indian Prime Minister Modi's first term fell short of many observers' expectations, as India did not move forward with anticipated market opening reforms, and instead increased tariffs and trade restrictions," it said.

"Modi's strong electoral mandate may embolden the Indian government to press ahead with its reform agenda with greater vigour. Slowing economic growth in India raises concerns about its business environment," CRS said.

As per a fact sheet issued by the Council on Foreign Relations (CFR), trade in goods and services between the two countries from 1999 to 2018 surged from $16 billion to $142 billion.

India is now the United States' eighth-largest trading partner in goods and services and is among the world's largest economies.

India's trade with the United States now resembles, in terms of volume, the US' trade with South Korea ($167 billion in 2018) or France ($129 billion), said Alyssa Ayres from CFR.

"The United States for two years now has set out in stone pretty clearly the things that they wanted to see to try to get an agreement, and it's basically then on India's doorstep on whether they want to take those steps," Rick Rossow, Wadhwani Chair in US-India Policy Studies at the Center for Strategic and International Studies think-tank told reporters during a conference call.

"The list of US asks has been pretty static all throughout. Not to say that any of these things are easy for India to do, but the United States to my knowledge didn't change the goalposts just because we now consider India to be a middle-income country. The things that we wanted to see happen to get this trade agreement have been pretty static all throughout, no matter how difficult they are," he said in response to a question.

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.