Mangalore University VC Prof. K Byrappa elected fellow of Royal Society

Ahmedabad, Feb 24: US President Donald Trump arrived in Ahmedabad on Monday for the first leg of his India trip.

The Air Force One plane carrying Trump and his wife Melania landed at the Sardar Vallabhbhai Patel international airport here at 11.37 am, officials said.

It was scheduled to land at 11.40 am.

Prime Minister Narendra Modi, who reached Ahmedabad over an hour before Trump did, was present at the airport to welcome the US president at the airport.

In Ahmedabad, Trump will visit Mahatma Gandhi's Sabarmati Ashram, take part in a roadshow with Modi and jointly address over one lakh people at a cricket stadium, before heading for Agra to see the iconic Taj Mahal with Melania.

Trump, who is also accompanied by daughter Ivanka, son-in-law Jared Kushner and top brass of his administration, will get a taste of India's cultural melange during his high- optics Gujarat itinerary, after the bonhomie between the two leaders at the 'Howdy, Modi!' event in Houston last year.

The US president and Modi will participate in a roadshow from the airport to Sabarmti Ashram and from there to the newly-built Motera cricket stadium, where over a lakh people are expected to be present for the 'Namaste Trump' event.

Dance groups and singers from different parts of the country will be performing on stages that are dotting the 22- km route of the 'India roadshow' in the city.

Huge billboards of the two leaders and replicas of historic places in Gujarat have also been placed along the roads where people will greet the two leaders.

Over 10,000 police personnel, besides officials of the United States Secret Service, and personnel of the National Security Guards (NSG) and the Special Protection Group (SPG) have been deployed for the high profile visit.

The seventh US president to visit India, Trump on Sunday retweeted a video in which his face was superimposed on the hit Indian movie-character Bahubali, showing him as a great saviour.

Modi will accompany Trump to the Sabarmati Ashram, which was home to Mahatma Gandhi from 1917-1930 during India's freedom struggle.

Several world leaders including Chinese President Xi Jinping and Japanese Prime Minister Shinzo Abe have visited Sabarmati Ashram in recent years.

Ashram secretary Amrut Modi said Trump will spend 15 minutes at the place.

"Trump will visit the 'Hriday Kunj'. If he wishes, he will spin a charkha (spinning wheel). We will also gift him a coffee-table book, and a book containing 150 quotations of Gandhi," the Ashram official said.

Hriday Kunj is a room on the Ashram premises where Mahatma Gandhi and his wife Kasturba Gandhi had lived for 12 years between 1918 and 1930.

The official said the US President would be briefed about Gandhiji and the importance of charkha as a symbol of self-reliance.

There will be a cultural extravaganza at the Motera stadium during the 'Namaste Trump' event, where Trump and Modi will address the gathering.

Bollywood singer Kailash Kher and some Gujarati folk singers will perform at the stadium, officials of the Gujarat Cricket Association said.

Students of various government and private schools have also been roped in to perform at cultural events and they have been practicing for days, an official said.

Billboards with slogans hailing Indo-US relations and having pictures of Trump and Modi walking together, shaking hands, and waving at the crowd during the 'Howdy Modi' event are dotting the city.

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study