HC issues notice to PM Modi over preventing ex-soldier from contesting against him

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, Jan 9: Amazon founder and CEO Jeff Bezos will be visiting India next week and is likely to meet Prime Minister Narendra Modi and officials, besides industry leaders, according to sources.

The top executive will also attend SMBhav – an event focussing on small and medium businesses in India - that is slated for January 15-16 in the capital city.

When contacted, Amazon declined to comment.

Amazon, which has seen significant growth in its business in India, has also witnessed protest from a section of traders in the country who claim that e-commerce giants including Amazon and Walmart-owned Flipkart offer deep discounts and engage in unfair business practices.

Last year, the government had tightened rules for e-commerce marketplaces with foreign investment. These rules barred such platforms from offering products of sellers in which they hold a stake and banned exclusive marketing arrangements among other clauses. Following this, Amazon restructured its joint ventures to ensure compliance.

Bezos is likely to discuss regulatory issues in his meeting with the government officials.

He is also slated to engage with SMBs during the SMBhav event. The event - which will focus on discussions around how technology adoption can enable SMBs in India - is slated to see participation from industry experts, policymakers, solution providers and Amazon leadership.

Thiruvananthapuram, Feb 29: With Saudi Arabia indefinitely suspending visas for visit to Islam's holiest site for the Umrah pilgrimage in the wake of coronavirus outbreak, more than 10,000 people in the state who are awaiting their turn this year for the annual Hajj pilgrimage are a worried lot.

"This year more than 10,000 people in Kerala have been cleared by the Hajj committee," said C Muhammed Faizy, chairman, Kerala State Hajj Committee.

"There is no cause of worry. We hope that during the time of the pilgrimage, the travel restriction by Saudi Arabia will be lifted," he said.

Umrah is a pilgrimage to the holy site that can be undertaken at any time of the year, while the annual Hajj pilgrimage has specific months according to the lunar calendar.

"The move by the Saudi Arabian Government to impose travel restriction was due to the outbreak of coronavirus. It is a preventive step to contain it. In such large gatherings, if one person is affected, it will spread to others. So we fully understand the concerns of the Saudi Government," Muhammed Faizy added.

He said that the Hajj Committee only processes the requests of annual Hajj visit pilgrims and not Umrah.

"This year we expect the Hajj pilgrimage season to be from June to August after Ramzan. But it may vary according to the Ramzan date. We are yet to get any official correspondence from the Saudi Government regarding travel restrictions," he added.

The Saudi Arabian Government suspended visas for tourists from countries affected by the coronavirus, with many having to cancel their Umrah pilgrimage at the last minute.