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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 14: The curative petitions of Vinay Sharma and Mukesh, who were sentenced to death in the Nirbhaya gang rape and murder case, was on Tuesday rejected by a five-judge Supreme Court Bench led by Justice N.V. Ramana.

In a three-page order, the Bench concluded, after an in chamber consideration that began about 1.45 p.m., that there was no merit in their pleas to spare them from the gallows.

“We have gone through the curative petitions and relevant documents. In our opinion, no case is made out within the parameters indicated in the decision of this Court in Rupa Ashok Hurra versus Ashok Hurra. Hence, the curative petitions are dismissed,” the court held.

Curative is a rare remedy devised by a Constitution Bench of the Supreme Court in its judgment in the Rupa Ashok Hurra case in 2002. A party can take only two limited grounds in a curative petition - one, he was not heard by the court before the adverse judgment was passed, and two, the judge was biased. A curative plea, which follows the dismissal of review petition, is the last legal avenue open for convicts in the Supreme Court. Sharma was the first among the four convicts to file a curative.

The Bench also rejected their pleas to stay the execution of their death sentence and for oral hearing in open court.

Besides Justice Ramana, the Bench comprised Arun Mishra, Rohinton Nariman, R. Banumathi and Ashok Bhushan.

Curative petitions were filed in the Supreme Court by both convicts on January 9. The petitions had come just days after a Delhi sessions court schedulled the execution of all the four convicts in Tihar jail on January 22.

Sharma and Mukesh, in separate curative petitions, argued that there was a “sea change” in the death penalty jurisprudence since their convictions. Carrying out the death sentence on such changed circumstances would be a “gross miscarriage of justice”.

In his plea, Sharma said the Court had commuted the death penalty in several rape and murder cases since 2017, when it first confirmed the death penalty to the Nirbhaya convicts.

“fter the pronouncement of judgment in 2017, there have been as many as 17 cases involving rape and murder in which various three-judge Benches of the Supreme Court have commuted the sentence of death,” the petition contended.

The Supreme Court recently dismissed a review petition filed by Akshay Singh, another of the four four condemned men, to review its May 5, 2017 judgment confirming the death penalty. It also refused his plea to grant him three weeks' time to file a mercy petition before the President of India.

A Bench led by Justice R. Banumathi had said it was open for the Nirbhaya case convicts to avail whatever time the law prescribes for the purpose of filing a mercy plea.

Akshay (33), Mukesh (30), Pawan Gupta (23) and Sharma (24) had brutally gang-raped a 23-year-old paramedical student in a moving bus on the intervening night of December 16-17, 2012. She died of her injuries a few days later.

The case shocked the nation and led to the tightening of anti-rape laws. Rape, especially gang rape, is now a capital crime.

One of the accused in the case, Ram Singh, allegedly committed suicide in the Tihar jail. A juvenile, who was among the accused, was convicted by a juvenile justice board. He was released from a reformation home after serving a three-year term.

New Delhi, Mar 6: Shares of YES Bank and State Bank of India came under huge selling pressure on Friday as developments unfolded regarding SBI picking stake in the private lender. Shares of the lender hit record low of Rs 5.55, plunging 85 per cent, and were trading below its previous low of Rs 8.16 hit on March 9, 2009.

SBI, on the other hand, slumped 11 per cent to Rs 257.35 on the BSE. The benchmark S&P BSE Sensex was trading with a cut of over 3 per cent at 37,251.37 level.

In the past three months, share price of the private lender has plunged 41 per cent, while the state-owned lender has slipped 14 per cent. In comparison, the S&P BSE Sensex has dipped 5.6 per cent till Thursday.

On Thursday, the Reserve Bank of India superseded the board of troubled private sector lender YES Bank and imposed a 30-day moratorium on it “in the absence of a credible revival plan” amid a “serious deterioration” in its financial health.

During the moratorium, which came into effect from 6 pm on Thursday, YES Bank will not be allowed to grant or renew any loans, and “incur any liability”, except for payment towards employees’ salaries, rent, taxes and legal expenses, among others.

This is the first time that a bank of this size will be put under a moratorium by the RBI.

“The financial position of YES Bank had undergone a steady decline “largely due to inability of the bank to raise capital to address potential loan losses and resultant downgrades, triggering invocation of bond covenants by investors, and withdrawal of deposits,” RBI said in a statement.

“After the moratorium, the next step will be to infuse to money and keep the bank afloat. So from shareholders’ point of view, the future is certainly hazy as the capital requirement is huge. The good part, however, is that the RBI has stepped in and depositors don't have to worry,” says Siddharth Purohit, a research analyst at SMC Securities.

Meanwhile, analysts at Nomura believe that placing the Bank under moratorium implies that equity value in the bank would be negligible, and that the chances of private capital participating in future capital raising plan are near zero.

"Any resolution for Yes Bank is more proposed from the perspective of deposit holders and systemic stability, and not from the perspective of Yes Bank equity investors or even perpetual bond holders," they wrote in a note dated March 6.

In another development, SBI’s Board Thursday gave in-principle approval to consider an “investment opportunity” in YES Bank, even as it said “no decision had yet been taken to pick up stake in the bank”.

According to a  report, highly-placed sources indicated a rescue plan involving SBI and Life Insurance Corporation of India (LIC) was being discussed and an announcement in this regard might be made soon.

“While the finer details of the deal are being worked out, it is anticipated that both SBI and LIC together will take a 51 per cent stake in the bank, with a one-year lock-in period,” the report said.

Most analysts believe it is a positive step for the Indian financial sector as the government has tried to avoid a repeat of IL&FS-like crisis.

“The move is a positive step for the financial sector as a whole. By this, the government has tried to avoid a repeat of IL&FS-like crisis and has saved the depositors,” said AK Prabhakar, Head of Research at IDBI Capital. While we know that YES Bank has a huge pile of bad loans, SBI is the only bank that has the capacity to absorb it, he added.

However, the valuation at which YES bank would be taken over remains a cause of concern.

Global brokerage firm JP Morgan Thursday cut its target price for YES Bank on Thursday to Rs 1 per share, taking into account the potential fall in the lender’s net worth due to stressed assets.

“We believe forced bailout investors will likely want the bank to be acquired at near-zero value to account for risks associated with the stress book and likely loss of deposits. We think the bank will need to be recapitalised at nominal equity value and could test dilution of additional tier 1 (AT1) capital. We remain underweight and cut our target price to Rs 1 as we believe net worth is largely impaired,” JP Morgan said in a note.

Global brokerage firm Nomura estimates a need of Rs 25,000-44,000 crore and adjusted for Rs 7,400 crore of current coverage, if the current stress of Rs 65,000-70,000 crore faces 70 per cent loss given default (LGD).

"It implies Rs 18,000-37,000 crore needed for provisioning against the current net worth of Rs 25,700 crore Also, to run as going concern, the bank would require over Rs 20,000 crore of CET-1 capital as well," the note said.

YES Bank has registered slippages of Rs 12,000 crore so far in FY20, while it has placed Rs 30,000 crore of loan assets under the watch list. Its deposits stood at Rs 2.09 trillion on September 30, 2019, while its advances totalled Rs 2.24 trillion. The bank has delayed publishing its December quarter results by a month to March 14.