'This made my Eid', says Delhi mango seller overwhelmed by donations from people after loot

New Delhi, Jun 7: Rain lashed some parts of the Delhi-NCR on Sunday morning.

The India Meteorological Department (IMD) has predicted partly cloudy sky with possibility of development of thunder lightning for three days from June 10 onwards with minimum and maximum temperature will hover around 29° Celcius and 42° Celcius respectively.

Strong surface winds during day time have been predicted for today by IMD.

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 19: Former Union Minister P Chidambaram said that as the fourth phase of the nationwide lockdown amid the coronavirus scare began from Monday, his thoughts were with the people of Kashmir who were in a "terrible lockdown within a lockdown."

The senior Congress leader said that at least now, the people in the rest of India will understand that he dubbed the "enormity of the injustice" done to those who were detained in Kashmir and those still under detention" immediately before and after the abrogation of Article 370 of the Indian Constitution on August 5, 2019.

Chidambaram said that former Jammu and Kashmir Chief Minister Mehbooba Mufti was the "worst sufferer" of preventive detention and even courts had shirked their constitutional duty with respect to detainees.

"The worst sufferers are Mehbooba Mufti and her senior party colleagues who are still in custody in a locked-down state in a locked-down country. They are deprived of every human right," he said in a statement.

"I cannot believe that for nearly 10 months, the courts will shirk their constitutional duty to protect the human rights of citizens," he added.

The detention on Mehbooba Mufti under the Public Safety Act (PSA) had been extended for three more months on May 5. Booked under the stringent PSA, she was initially kept at the Hari Niwas guesthouse in Srinagar but later shifted to a Tourism Department hut in the Chashma Shahi area.

She was shifted to her Gupkar Road official residence on April 7.

Besides Mehbooba Mufti, two other former Chief Ministers -- Omar Abdullah and his father Farooq Abdullah -- were also detained under the PSA but later released.