Why expect jobs from govt? Start paan shop or breed cows: BJP CM tells people

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.

Jun 19: Billionaire Mukesh Ambani on Friday announced that his oil-to-telecom conglomerate Reliance Industries is now net debt-free after raising a record Rs 1.69 lakh crore from global investors and a rights issue in under two months.

Reliance raised Rs 1.15 lakh crore from global tech investors by selling a little less than a quarter of the firm's digital arm, Jio Platforms Ltd, and another Rs 53,124.20 crore through a rights issue in the past 58 days.

Taken together with last year's sale of 49 per cent stake in fuel retailing venture to BP Plc of UK for Rs 7,000 crore, the total fund raised is in excess of Rs 1.75 lakh crore, the company said in a statement.

Reliance had a net debt of Rs 1,61,035 crore as on March 31, 2020. "With these investments, RIL has become net debt-free," it said.

"I have fulfilled my promise to the shareholders by making Reliance net debt-free much before our original schedule of March 31, 2021," Ambani said.

Jio Platforms - which houses the country's youngest but largest telecom firm Reliance Jio, raised Rs 1,15,693.95 crore from leading global investors including Facebook, Silver Lake, Vista Equity Partners, General Atlantic, KKR, Mubadala, ADIA, TPG, L Catterton and PIF since April 22, 2020.

Saudi Arabian sovereign wealth fund PIF buying 2.32 per cent stake in the unit for Rs 11,367 crore on June 18 "marks the end of Jio Platforms' current phase of induction of financial partners," the statement said.

Alongside, Reliance launched India's biggest right issue, which was subscribed to 1.59 times.

Though the rights issue size was Rs 53,124 crore, the company has got only 25 per cent of the money as the remaining is to be paid only next fiscal.

Ambani had at the company's annual general meeting on August 12, 2019, announced a roadmap for Reliance to become a net debt-free company before March 31, 2021.

"We have a very clear roadmap to becoming a zero net-debt company within the next 18 months that is by March 31, 202," he had said last year highlighting strong interest from strategic and financial investors in consumer businesses, Jio and Reliance Retail.

In the statement on Friday, he said he was both delighted and humbled to announce the fulfillment of the promise.

"Exceeding the expectations of our shareholders and all other stakeholders, again and yet again, is in the very DNA of Reliance," he said.

"Therefore, on the proud occasion of becoming a net debt-free company, I wish to assure them that Reliance in its Golden Decade will set even more ambitious growth goals, and achieve them," he added.

He said over the past few weeks, phenomenal interest was received from the global financial investor community in partnering with Jio.

"As our fundraising milestone from financial investors is achieved, we sincerely thank the marquee group of financial partners and warmly welcome them into Jio Platforms," he said.

"I also express my heartfelt gratitude to all the retail and institutional investors, both domestic and foreign, for their overwhelming participation in our record-setting Rights Issue," he added.

Thiruvananthapuram, May 22: Domestic flyers arriving in Kerala must undergo strict home quarantine as per the lockdown guidelines, in view of increasing COVID-19 cases in the state, Health Minister K K Shailaja said on Friday.

"Even if the domestic flight services resume, those coming in must remain under strict home quarantine as per the guidelines.

There is no change in that. Most people will be coming from the major hotspots of the country," she said.

Announcing the resumption of domestic flight services from May 25, the Civil Aviation Ministry had indicated on Thursday that it was not in favour of quarantining passengers on short-haul flights.

However, the Assam government has made it mandatory for all air passengers coming to that state to stay in quarantine for 14 days.

Apart from the health department and the local self government institutions, Shailaja said the people of Kerala must also ensure that every returnee to the state remained under strict home quarantine in order to curb the spread of the disease.

"We need to strictly keep under observation all those who come fromoutside the state and make sure that they do not come into contact with others including their family members.

They should be effectively remain under room quarantine at their residence," she said.

The state reported 690 cases after 24 more tested positive for coronavirus on Thursday.

As of now over 80,000 people are under observation across the state.

On the death of a 73-year-old woman, who came from Mumbai, on Thursday, the minister said, "Khadijakuttycame from Mumbai along with three others. She alighted at Chavakkad. Her son who picked her up from there took her to the govt hospital as she was tired. She was given good care."

"However, as her condition worsened, had taken a decision to sent her to the medicalcollege. Her swab test was taken and she was tested positive, but she passed away," Shailaja said.

The minister sounded a word of caution that there would be an increase in cases in the coming days as the influx of people coming from abroad and other states would continue.

"We cannot prevent anyone from coming. They are our brothers and were suffering there. We need to save those who come here and also those who are here," the Minister said.

Shailaja said the southern state had successfully managed the first two phases of the viral outbreak in January and March.

"There were three deaths. But we managed to save the rest of the people including a 93-year-old man," she said.

The Minister further said the situation in the state changed after flight services resumed and the border roads were re-opened after May 7.

"Our fatality rate is low and recovery rate is high.

After May 7, when the flight restrictions were lifted and people from other states started coming in, we reported 188 cases.

At least 90 per cent of the positive cases came from outside and the rest are their contacts," she noted.