'Take advantage of India's growth': Naidu to Zimbabwe

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, Feb 12: The Centre on Wednesday said the NRC data in Assam is safe even though some technical issues were visible and that will be resolved soon.

The Union Home Ministry clarification came in view of reports that data of the final list of the National Register of Citizens has been made offline from its official website.

"The NRC data is safe. Some technical issues are in visibility on cloud. These are being resolved soon," a home ministry spokesperson said.

The data was not available for a couple of days and it created panic in the public, mostly among the people excluded from the list as the rejection certificates were yet to be issued.

NRC State Coordinator Hitesh Dev Sarma accepted that the data has been made offline, but refuted the allegation of any "malafide" intent in it.

The cloud service for the huge set of data was provided by IT firm Wipro and their contract was till October 19 last year. However, this was not renewed by the previous coordinator.

So, the data got offline from December 15 after it was suspended by Wipro, Sarma said.

He said the state coordination committee had decided to do necessary formalities in its meeting on January 30 and wrote to the Wipro during the first week of February.

"Once Wipro makes the data live, it will be available for public. We hope people will be able to access it in the next 2-3 days," Sarma said.

The complete detail of exclusion and inclusion of bonafide Indian citizens in the NRC was uploaded on its official website http://www.nrcassam.nic.in after the final list was published on August 31, 2019.

The final NRC was published by excluding 19,06,657 persons. A total of 3,11,21,004 names were included out of 3,30,27,661 applicants.

After the earlier NRC State Coordinator Prateek Hajela relinquished the charge on November 11 following his transfer to home state Madhya Pradesh on a direction from the Supreme Court, Sarma was appointed in his place on November 9.

New Delhi, Jun 26: Congress president Sonia Gandhi on Friday said the central government cannot shirk its responsibility of securing our borders with China and asked Prime Minister Narendra Modi to take the nation into confidence on the situation in Ladakh.

In a video message put out as part of the Congress party's campaign to honour the Army personnel who sacrificed their lives in Ladakh, she asked why the country's soldiers were martyred when China has not captured any Indian territory, as claimed by the Prime Minister.

"Today when there is a crisis-like situation at the India-China border, the central government cannot shirk its responsibility (of securing them)," she said in a video message as part of 'SpeakUpForOurJawans' campaign.

"The country wants to know if China has not captured our land in Ladakh, as claimed by the Prime Minister, then why were our 20 soldiers martyred," she asked.

She said while the Prime Minister says there is no intrusion into Indian territory, experts after seeing satellite images talk of the presence of Chinese troops in our territory confirming the intrusions.

"When and how will the Modi government take back from China our land in Ladakh? Is our territorial integrity being violated by China in Ladakh? Will the Prime Minister take the nation in confidence on the situation at the border?" Gandhi asked.

She said the government should give full support and strength to the Army, saying "this will be true patriotism".