Madrasa boundary wall demolished following rumours of beef recovery in area

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.

Kolkata, May 19: The super cyclonic storm 'Amphan' in west-central Bay of Bengal is likely to weaken into an 'extremely severe cyclonic storm' by noon on Tuesday, the Met department said here.

The system, which was situated 670 km south-southwest of Digha in West Bengal, is very likely to move north-northeastwards across northwest Bay of Bengal, and cross West Bengal-Bangladesh coasts in the afternoon or evening of Wednesday as a 'very severe cyclonic storm', the Met department said.

The weatherman said that 'Amphan' is expected to cross West Bengal-Bangladesh coasts between Digha in West Bengal and Hatiya islands in Bangladesh on May 20 as a very severe cyclonic storm, after losing some steam as it approaches landfall, with a maximum sustained wind speed of 155 to 165 kmph gusting to 180 kmph.

Gale wind speeds reaching 240 to 250 kmph were prevailing over west-central and adjoining east-central Bay of Bengal, the Met office said, adding, it will gradually reduce to 200 to 210 kmph gusting to 230 kmph by Tuesday evening.

The Met department, which has issued an "orange message" for West Bengal, warned of extensive damage in Kolkata, Hooghly, Howrah, South and North 24 Parganas and East Midnapore districts.

There is likely to be disruption of rail and road link at several places, uprooting of communication and power poles and extensive damage to all types of 'kutcha' houses, the weatherman said.

There is also likelihood of massive harm to standing crops, plantations and orchards, the Met office said.

Wind speeds along and off the coastal areas of West Bengal will reach 45 to 55 kmph with gusts of 65 kmph from Tuesday afternoon, and will gradually increase becoming gale wind speeds reaching 75 to 85 kmph with gusts up to 95 kmph from May 20 morning along and off districts of North and South 24 Parganas, East and West Midnapore, Kolkata, Howrah and Hooghly, Regional Met Director G K Das said.

"It will gradually increase thereafter becoming 110 to 120 kmph gusting to 130 kmph over West Midnapore, Howrah, Hooghly, Kolkata and wind speeds of 165 to 175 kmph gusting to 195 kmph over the districts of North and South 24 Parganas and East Midnapore from the afternoon to night of May 20," Das said.

Under its impact, the coastal districts of Gangetic West Bengal, including North and South 24 Parganas, Kolkata, East and West Midnapore, Howrah and Hooghly are likely to experience light to moderate rain at many places with heavy downpour at isolated places on Tuesday, he said.

On Wednesday, rainfall will occur in many places over the districts of Gangetic West Bengal, with extremely heavy rain at one or two places in Kolkata, Howrah, East Midnapore, North and South 24 Parganas and Hooghly districts, he said.

Lucknow, May 25: Migrant workers who wish to return to their places of work after the lockdown is lifted, may no longer find the going easy now.

Uttar Pradesh Chief Minister Yogi Adityanath has said that his government will lay down stringent conditions for ensuring social security of workers from the state who are hired by other states.

"Other states will also need to seek permission from his government before engaging workers from UP," he said while addressing a webinar on Sunday.

The Chief Minister stated, "If any state wants manpower, the state government will have to guarantee social security and insurance of the workers. Without our permission they will not be able to take our people," he said.

He said all migrant workers who have returned to the state were being registered and their skills were being mapped by the administration. Any state or entity interested in hiring them will need to take care of their social, legal and monetary rights.

Speaking about the challenges his administration had faced during this crisis, the Chief Minister said, "When I talk of Uttar Pradesh, then it is natural to say that it is the state with the highest population. We have faced several challenges during the lockdown. At the beginning, migrant workers and labourers started coming to the state. We deployed 16,000 buses and within 24 hours, they were brought back to their home districts and arrangements were made to screen them."

Yogi Adityanath took a dig at the opposition leaders for the migrant crisis. "During the lockdown, if those who now raise slogans for the poor had honestly cared about workers, then migration could have been stopped. This did not happen. No facilities were given. At several places, electricity connections were cut, so people had to migrate." he said.

Legal experts, meanwhile said that requiring government permission for employing people could face a legal challenge as the Constitution guarantees the freedom of movement and residence and employment of workers.

"Article 19 (1)(D) guarantees freedom to move freely, and 19(1)(e) the freedom to settled in any part of the countryso the need for permission can be legally challenged," said a senior lawyer.