‘Conspiracy’: Kerala won't protect activists led by Trupti Desai to visit Sabarimala

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, Jan 20: Union Finance Minister Nirmala Sitharaman on Sunday said the kind of cleaning in the system that the BJP-led government had to carry out after coming to power in 2014 was "unbelievable" and it undertook the exercise without any grudge or worry.

Between 2014-16, there were a lot of questions as to why reforms did not come fast and there were comments that the government was incapable of bringing them, she said delivering the Nani Palkhivala Memorial lecture on "Road Map to $5 Trillion Economy" here.

Pointing out that there were allegations and criticism that the government wants to do something but it did not, Sitharaman said, "I am fully willing to buy that." She recalled that Prime Minister Narendra Modi often said he did not believe in incremental changes and the country needed good transformational change. The stage in which India is today, it cannot have little marginal increments, but good transformational change.

"But still one might say in the last five years the government never did. That can be a critical analysis and I am fully willing to buy that. Because post-2014 the kind of cleaning up the government had to do was unbelievable and we undertook that exercise without a grudge without a worry.. we had to do it and it is part of the game," she said. Elaborating, Sitharaman said states have their own views on Land Acquisition Bill and the government could not have done anything because land, after all, is with them.

Commenting on the topic 'Road Map to $5 trillion economy,' she said quoting Prime Minister Narendra Modi's comments, the government would take the route "Sarkar ka abhaav nahi hona chahiye, prabhaav hona chahiye aur dabaav nahi hona chahiye."

"Abhaav and dabaav both of which are not desirable, abhaav is the inadequacy or lack of adequate presence or shortfall. You do not need a shortfall. You need a government where it should be present, where it is expected to function.", she said.

"So there should not be abhaav. Dabaav (meaning pressure) is not something you want from the government. So, you want Prabhaav. It is broadly an influence, facilitation, broadly the philosophy with which it is mandated, she said.

Noting that the government has got the mandate through the election, she said, "The mandate was spelt out in so many different ways in its manifesto. So the route towards $5 trillion is this."

"We have to be there to facilitate. We have to be there to make it easy. We have to be where you need us, where there is no policy (reforms from the government)," she said.

On the Insolvency and Bankruptcy Code (IBC) implemented by the government, the union minister said the approach of the IBC was not to shut business. "IBC takes on the approach in having some kind of resolution where all people who exploited the company do not come back through the "back door," she said.

IBC was done through better management so that the institution is alive and kicking. It is something which she wanted to carry forward from Modi 1.0 to 2.0. "The point I am trying to make on this road to $5 trillion economy is that it is not just an abstraction, this is not how I want India to be. But in micro-level too, we are coming in response to every stakeholder," she said.

New Delhi, Jan 19: Reacting to a tweet by ace lawyer Indira Jaising urging her to forgive the four men on death row for brutally raping that finally took her life, Nirbhaya's mother said on Saturday: "Even if God asks me, I won't forgive them."

Speaking to news agency, over the phone, the mother who had been fighting for seven long years to send her daughter's killers to the gallows, said, "...even if god comes and asks me to forgive them, I will not. People like these (Jaising) are a blot on the society."

Commenting on Jaising's tweet, she said: "Who is she to tell or suggest to me to forgive them. What relation does she have with me. I have nothing to do with such people. She can be a relative of those (the convicts) that she is having a soft corner for."

"She is an insult to women. She is running a business in the name of human rights. She is a veteran, she should give a message to the society. But she instead will go against her own kind," she added.

Earlier in the day, Jaising had requested Nirbhaya's mother to follow the example of Congress president Sonia Gandhi, who had moved for the clemency of a woman, Nalini Murugan convicted for the assassination of her husband and former Prime Minister Rajiv Gandhi.

"While I fully identify with the pain of Nirbhaya's mother I urge her to follow the example of Sonia Gandhi who forgave Nalini and said she didn't want the death penalty for her. We are with you but against death penalty," Jaising tweeted on Friday.

A Delhi Court on Friday issued fresh death warrants against the four convicts -- Akshay, Pawan, Mukesh and Vinay in the Nirbhaya gang rape and murder case.

Additional Sessions Judge (ASJ) Satish Kumar Arora fixed 1 February as the date of execution of the four death row convicts. They will be hanged at 6am.

The move came after the prosecution moved an application seeking issuance of fresh death warrants following the rejection of the mercy plea of one of the convicts Mukesh by President Ram Nath Kovind.

The 23-year-old victim was brutally gang-raped and tortured on December 16, 2012, which later led to her death.

All the six accused were arrested and charged with sexual assault and murder. One of the accused was a minor and appeared before a juvenile justice court, while another accused committed suicide in Tihar Jail.

Four of the convicts were sentenced to death by a trial court in September 2013, and the verdict was confirmed by the Delhi High Court in March 2014 and upheld by the Supreme Court in May 2017, which also dismissed their review petitions.