Former Delhi CM Sheila Dikshit passes away at 81

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.

Aligarh, Jul 20: The son of a motor mechanic in Aligarh, who had received a scholarship, topped at his high school in the United States.

Mohammad Shadab, son of the motor mechanic, told ANI, "Last year, I received the Kennedy-Lugar youth exchange scholarship worth Rs 20 lakh from the US government. Following this, I went to the States to pursue my high school education."

Out of 800 students, Shadab was also selected Student of the Month at his school. On his achievement, he said, "It was an achievement for me to be awarded this tag."

"I have worked really hard to top the high school," Shabad said.

Shadab said, "The condition at home was not good and it is still not that good. I want to support my parents and make them feel proud."
He also thanked the Indian government. "I am thankful to the Indian government for making me the flag-bearer in another county and choosing me for this scholarship."

Shabad's father, Arshad Noor, who is working as a motor mechanic for the past 25 years, said, "We had sent him to the US for his education and I am happy that he topped at the school."
On being asked about his son, Arshad said, "I want my son to become an IAS officer and serve the country."

But Shadab expressed the desire to work at the United Nations as a human rights officer.

Rajghat, Feb 23: The maternal uncle of Dr Kafeel Khan, who was recently arrested for allegedly making inflammatory statements during anti-CAA protests, was shot dead in front of his house at Bankatichak in Rajghat area, police said on Sunday.

Dr Nusratullah Warsi aka Dada (55), a property dealer, was shot dead on Saturday night at about 10:45 pm and an FIR against two people was filed in this connection on a written complaint of his family members.

According to police, it appears to be a case of murder due to monetary and property dispute and they are searching for both the accused.

Dr Kafeel Khan, suspended doctor of Gorakhpur BRD Medical College, was last month arrested under charges of giving a provocative speech during a protest against the CAA and NRC at Aligarh Muslim University and was later charged with the National Security Act.

Warsi on Saturday evening had gone to his lawyer Siraj Tariq's house, a few metres away from his own house, and was returning home on foot when a man shot him in his head, killing him on the spot.

"On the written complaint of family members, case of murder against one Imammuddin and Anil Sonkar has been registered and police has initiated probe and is searching for both the accused. Police met the women in their house and is interrogating them," Circle Officer VP Singh said.

Prima facie it appears to be a case of property and money dispute, he said, adding, three teams have been constituted to investigate the case and soon the accused will be caught.

Dr Kafeel Khan had last month raised apprehension in a Mumbai court about being killed in an "encounter" by the Uttar Pradesh police after claiming that he had been "falsely" implicated in the case by them.

The paediatrician had come to the limelight in 2017 when a controversy broke out after the death of over 60 children in less than a week at the BRD Medical College in Gorakhpur in Uttar Pradesh, where he was posted.