US defence secretary calls for ceasefire in Yemen

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 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.

Karachi, Jun 29: Four heavily-armed militants attacked the busy Pakistan Stock Exchange on Monday morning, killing four security guards and a police sub-inspector before being shot dead in an exchange of fire, media reports said.

The unidentified militants opened indiscriminate fire and lobbed hand grenades at the main gate of the building as they tried to storm it, Geo News reported.

Police said that all the terrorists have been killed while five persons injured in the attack.

Four security guards and a police sub-inspector were also killed in the attack.

"An unfortunate incident took place at the Pakistan Stock Exchange. They made their way from our parking area and opened fire on everyone," said Abid Ali Habib, Director of Pakistan Stock Exchange.

The firing by militants caused panic among the people in the building.

Sindh province Governor Imran Ismail condemned the incident.

"Strongly condemn the attack on PSX aimed at tarnishing our relentless war on terror. Have instructed the IG & security agencies to ensure that the perpetrators are caught alive & their handlers are accorded exemplary punishments. We shall protect Sindh at all costs," he said on Twitter.

Police and rangers have arrived on the spot and surrounded the area.