US presidency under Trump to boost strategic ties with India

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, May 28: US President Donald Trump has warned social media giants that his government could "strongly regulate" or "close them down" after Twitter fact-checked one of his tweets for the first time.

"Republicans feel that Social Media Platforms totally silence conservatives voices," Xinhua news agency reported citing Trump as saying in a tweet to his 80 million followers on Wednesday.

"We will strongly regulate, or close them down, before we can ever allow this to happen."

Later in the day, he said that Twitter "has now shown everything we have been saying about them... is correct" and vowed "big action to follow".

The President's remarks came after Twitter slapped a warning label on one of his tweets on Tuesday, cautioning readers "Trump makes unsubstantiated claim that mail-in ballots will lead to voter fraud".

It was in response to Trump's tweet, without providing evidence, said: "There is NO WAY (ZERO!) that Mail-In Ballots will be anything less than substantially fraudulent."

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It is unclear what regulatory steps the president could take without new laws passed by Congress, the BBC reported.

The White House is yet to offer further details.

Earlier, Trump has accused Twitter of interfering in this year's US presidential election scheduled for November, saying the company was "completely stifling free speech, and I, as president, will not allow it to happen".

With more than 52,000 tweets currently to his name, Trump is a prolific tweeter and relies on the platform to disseminate his views to millions of people.

He has used Twitter to launch attacks on opponents, with targets ranging from North Korean leader Kim Jong-un to his political rivals in the US.

In 2017 he used anti-Muslim tweets aimed at London Mayor Sadiq Khan to serve a domestic political purpose of warning about immigration.

Washington, Feb 25: Democratic presidential front-runner Senator Bernie Sanders on Monday slammed President Donald Trump for selling weapons to India, saying that the US should instead partner with New Delhi to fight climate change to save the planet.

Sanders, who has won the Nevada and New Hampshire primaries and tied in Iowa, made the comments after Trump, who is on a two-day visit to India, on Monday announced that the US will sign defence trade deals worth USD 3 billion with India.

In an address at a massive "Namaste Trump" rally at Motera stadium in Ahmedabad, Trump announced that deals to sell state-of-the-art military helicopters and other equipment worth over USD 3 billion will be sealed with India on Tuesday.

“Instead of selling USD 3 billion in weapons to enrich Raytheon, Boeing and Lockheed, the United States should be partnering with India to fight climate change,” Sanders said in a tweet, the first by a Democratic presidential candidate on Trump's India visit.

“We can work together to cut air pollution, create good renewable energy jobs, and save our planet,” he said.

However, a former White House official defended the US' decision to sell arms and weapons to India.

“I'm proud of my service in the White House, in which we poured enormous energy into deepening climate and green tech cooperation w/ India... and also advancing security cooperation and defense sales. I'd like to think both can be part of a strong, values-based partnership,” Joshua White said.

According to the US State Department, India plays a vital role in the US vision for a free and open Indo-Pacific.

In 2016, the US designated India as a Major Defence Partner. Commensurate with this designation, India in 2018 was granted Strategic Trade Authorization tier 1 status, which allows New Delhi to receive license-free access to a wide range of military and dual-use technologies that are regulated by the Department of Commerce.

Bilateral defence trade with India in a little over a decade has increased from near zero in 2008 to USD20 billion.

Among some of the key foreign military sales notified to Congress include MH-60R Seahawk helicopters (USD2.6 billion), Apache helicopters (USD2.3 billion), P-8I maritime patrol aircraft (USD3 billion), and M777 howitzers (USD737 million).

India was the first non-treaty partner to be offered a Missile Technology Control Regime Category-1 Unmanned Aerial System – the Sea Guardian UAS manufactured by General Atomics.

The State Department is also advocating for the Lockheed Martin F-21 and Boeing F/A-18 – two state of the art fighter aircraft that India is currently evaluating.

These platforms provide critical opportunities to enhance India's military capabilities and protect shared security interests in the Indo-Pacific region, it argued.

The top categories of DCS to India include aircraft, electronics and gas turbine engines.