BJP distributed obscene pamphlets against me: Atishi

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, May 29: Union Home Minister Amit Shah on Friday met Prime Minister Narendra Modi and informed him about the views of all chief ministers on the extension of the ongoing nationwide lockdown beyond May 31, officials said.

During the meeting, Shah briefed Modi about the suggestions and the feedback he received from the chief ministers during his telephonic conversations on Thursday, a government official said.

The nationwide curbs were first announced by Prime Minister Narendra Modi on March 24 for 21 days in a bid to contain the spread of novel coronavirus. It was first extended till May 3 and then again till May 17. The lockdown was further extended till May 31.

The home minister's telephonic conversations with the chief ministers came just three days before the end of the fourth phase of the lockdown.

During his talks with the chief ministers, Shah sought to know the areas of concern of the states and the sectors they want to open up further from June 1, the official said.

Interestingly, till now, it was Modi who had interacted with all chief ministers through video conference before the extension of each phase of the coronavirus-induced lockdown and sought their views.

This was for the first time that the home minister spoke to the chief ministers individually before the end of another phase of the lockdown.

Shah was present in all the conferences of chief ministers along with the prime minister. It is understood that the majority of the chief ministers wanted the lockdown to continue in some form but also favoured opening up of the economic activities and gradual return of the normal life, another official said.

The central government is expected to announce its decision on the lockdown within the next two days.

The number of COVID-19 cases in India has climbed to 1,65,799 on Friday, making it the world's ninth worst-hit country by the coronavirus pandemic.

The Health Ministry said the death toll due to COVID-19 rose to 4,706 in the country. While extending the fourth phase of the lockdown till May 31, the central government had announced the continuation of the prohibition on the opening of schools, colleges and malls but allowed the opening of shops and markets.

It said hotels, restaurants, cinema halls, malls, swimming pools, gyms will remain shut even as all social, political, religious functions, and places of worship will remain closed till May 31.

The government, however, allowed limited operations of the train and domestic flights. The Indian Railways is also running special trains since May 1 for transportation of migrant workers from different parts of the country to their native states.

New Delhi, May 18: Very severe cyclonic storm ‘Amphan’, over central parts of South Bay of Bengal, has intensified into extremely severe cyclonic storm, the India Meteorological Department (IMD) said on Monday. The weather department has warned that ‘Amphan’ may turn into a “super cyclonic storm’.

According to experts, North Odisha coast will face the maximum impact of cyclone Amphan when it makes landfall.

“Wind speed expected to be 110-120 kmph, gusting up to 130 kmph. Balasore, Bhadrak, Jajpur, Mayurbhanj dist can be affected on 20 May (when it makes landfall), IMD Bhubaneswar scientist Umashankar Das told news agency ANI.

The IMD has said that ‘Amphan’ will cross West Bengal - Bangladesh coasts between Digha (WB) and Hatiya island - in the afternoon/evening of May 20 as very severe cyclonic storm.

Earlier, the IMD had warned that ‘Amphan’, over central parts of South Bay of Bengal, will intensify into an extremely severe cyclonic storm on Monday.

“Very Severe Cyclonic Storm (VSCS) ‘AMPHAN’ over central parts of South Bay of Bengal near latitude 12.5°N and longitude 86.4°E, about 870 km nearly south of Paradip (Odisha). To intensify further into an Extremely Severe Cyclonic Storm (ESCS) in the next six hours,” the IMD said in a tweet on Monday.

National Disaster Response Force (NDRF) has sent its 10 teams to Odisha and seven teams to West Bengal in view of the approaching Cyclone Amphan, news agency reported.