Narendra Modi, BJP MPs to observe fast to protest budget session washout

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 16: United Forum of Bank Unions has decided to observe a two-day strike on January 31 and February 1, demanding early wage revision settlement which has been due since November 1, 2017, said the All India Bank Employees Association.

Union Finance Minister Nirmala Sitharaman will present her second Union Budget on February 1.

Banks will also hold a strike on March 11, 12 and 13. Also, an indefinite strike will be held from April 1.

General Secretary, All India Bank Officers' Confederation West Bengal Sanjay Das has stated that the nationwide strike has been called over several demands.

"The demands include--wage revision settlement at 20 per cent hike on payslip components with adequate loading thereof and scrapping off New Pension Scheme (NPS)," said Das.

There are several demands to hold the strike including the merger of special allowance with basic pay, updation of pension, improvement in the family pension system, five-day banking, allocation of staff welfare fund based on operating profits and exemption from income tax on retiral benefits without a ceiling.

"Other demands include-- a uniform definition of business hours, lunch hour etc in the branches, introduction of leave bank, defined working hours for the officers and equal wage for equal work for the contract employee," said Das.

New Delhi, Jul 25: India reported a spike of 48,916 coronavirus cases on Saturday, according to the Union Ministry of Health and Family Welfare.

The total COVID-19 positive cases stand at 13,36,861 including 4,56,071 active cases, 8,49,431 cured/discharged/migrated. With 757 deaths in the last 24 hours, the cumulative toll reached 31,358.

Maharashtra has reported 3,57,117 coronavirus cases, the highest among states and Union Territories in the country.

A total of 1,99,749 cases have been reported from Tamil Nadu till now, while Delhi has recorded a total of 1,28,389 coronavirus cases.

According to the Indian Council of Medical Research (ICMR), 4,20,898 samples were tested for coronavirus on Friday and overall 1,58,49,068 samples have been tested so far.