25-year-old student from Telangana shot in US restaurant, dies

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.

Singapore, May 6: Oil prices slipped back Wednesday after two days of gains, although Brent crude remained above $30 a barrel, as renewed US-China tensions offset optimism about the easing of coronavirus lockdowns.

Brent, the international benchmark, fell 1.1 per cent to $30.63 a barrel in early Asian trade. On Tuesday, the contract surged 14 per cent and rose above $30 for the first time since mid-April.

US marker West Texas Intermediate slipped 1.9 per cent and was changing hands for $24.13 a barrel.

Oil markets have been battered as the virus strangled demand due to business closures and travel restrictions, with US crude falling into negative territory last month for the first time.

They started rallying strongly this week as countries from Europe to Asia ease curbs and economies start shuddering back to life.

But gains were capped Wednesday as dealers follow a brewing US-China row after Donald Trump hit out at Beijing over its handling of the outbreak, saying it began in a Wuhan lab, but so far offering no evidence.

"Traders are incredibly cautious this morning, weighing all the possible China responses," said Stephen Innes, chief global market strategist at AxiCorp.

"And the one that would hurt the most would be for China to reduce imports of US oil."

This week's rally was in part driven by a deal agreed between top producers to reduce output by almost 10 million barrels a day, which came into effect on May 1.

There have also been signs that the massive oversupply in the market is starting to ease as demand slowly comes back.

Energy data provider Genscape said earlier this week that stockpiles at the main US oil depot in Cushing, Oklahoma had increased by only 1.8 million barrels last week following weeks of major rises.

New Delhi, Jan 16: In trouble brewing for the Gautam Adani-led M/S Adani Enterprises, the Central Bureau of Investigation (CBI) on Thursday said that it has registered a case against former officials of the National Co-operative Consumer Federation (NCCF) and others over alleged irregularities in supply of coal to the Andhra Pradesh Power Generation Corporation (APGENCO) in 2010.

The CBI in its FIR has named Virendra Singh, the then Chairman of the NCCF, G P Gupta, the then MD of the NCCF, S C Singhal, the then Senior Advisor of NCCF, Adani Enterprises Ltd and other unknown public servants and others for criminal conspiracy, cheating and criminal misconduct by public servants.

According to CBI, the case was filed on Wednesday after the preliminary enquiry revealed the crime by the officials named in the FIR and the Adani Enterprises was found to be true.

The FIR alleged that on June 26, 2010, APGENCO floated a tender enquiry for supply of six lakh metric tonnes of imported coal "on free on rail destination" basis to Dr Narla Tata Rao Thermal Station (NTTPS), Vijaywada and Rayalasaleema Thermal Power Plant (RTTP), Kadapa, Andhra Pradesh/RTPP via Kakinada-Vizag-Chennai-Krishnapatnam or any other ports

The same was forwarded by the Chief Engineer, APGENCO to seven PSUs -- PEC Limited, STC Limited, MSTC Limited, NCCF, MMTC, Coal India Limited and SCCL Limited.

The FIR alleged that during the probe, the Adani Enterprises used a proxy company to get the supply contract. It said, "NCCF received bids from six companies -- Adani Enterprises Ltd, Maheshwari Brothers Coal Limited (MBCL), Vyom Trade Links Pvt. Ltd, Swarana Projects Pvt. Ltd, Gupta Coal India Ltd and Kyori Oremen Ltd.

During investigation it was found that Gupta Coal India Ltd had quoted the NCCF margin of 11.3 percent, while the MBCL quoted the margin of 2.25 percent and rest did not quote any margin to the NCCF.

The FIR said the quotes of the Gupta Coal India Ltd, Kyori Oremen Ltd and Swarana Projects Pvt. Ltd were rejected by the NCCF as they were not found to be fulfilling the tender conditions.

"Post tender negotiation was done by senior officials of NCCF to give undue favour to Adani Enterprises Ltd despite it not qualifing the tender (terms)," the FIR said, adding instead of cancelling the bid of Adani Enterprise Ltd, senior management of NCCF conveyed the offer margin to the company through one of its representative -- Munish Sehgal, who was sitting in the NCCF head office. It is prima facie evident that when the bids were being processed at NCCF head office in Delhi, a representative of Adani Enterprises Ltd. was informed regarding their imminent rejection due to non-submission of NCCF margin and also that MBCL was eligible bidder quoted 2.25 percent margin," it alleged.

The CBI in its FIR, further alleged that Adani Enterprises Ltd. had given an unsecured loan of Rs 16.81 crore to Vyom Trade Links Ltd in 2008-09. "And further it was revealed that the bank guarantees of the Adani Enterprises Ltd. and Vyom Trade Links Ltd. were issues by the same branch of the State Bank of India and at the same time," it said.

"It was clear that Adani Enterprises Ltd. presented Vyom Trade Links Ltd. as a proxy company in this particular tender and Vyom Trade Links Ltd. later withdrew its offer on flimsy ground," the CBI FIR said.

"The aforesaid acts of commissions and omissions on the part of the senior management of the NCCF disclose that during their tenure, they acted in a manner unbecoming of public servants and committed irregularities by way of manipulation in the selection of bidders, thereby giving undue favours to Adani Enterprises Ltd. in award of work for supply of coal to APGENCO despite its disqualification," it added.