Economic outlook cloudy in FY20: RBI annual report

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, Mar 22: The exercise to update the National Population Register (NPR) and the first phase of the Census 2021, scheduled to begin from April 1, are likely to be deferred for an indefinite period due to Coronavirus pandemic, officials said.

A formal order on this effect is expected within a day or two.

Discussions are going on at the highest level of the government and in all probability, the NPR and house listing phase of the Census work will be deferred till the threat of the Coronavirus is over, a home ministry official said.

The exercise to update NPR and the housing listing phase of the Census is scheduled to be carried out across the country from April 1 to September 30.

Last week, the home ministry had said the preparation for the Census 2021 and updation of the NPR were at its peak and they will begin from April 1.

The ministry said this after a conference of the Directors of the Census Operations on status of preparatory work around Census 2021 and NPR updation.

There has been opposition from several state governments to the NPR and some of the assemblies even adopted resolutions expressing reservations on the exercise.

The states which have been opposing the NPR include Kerala, West Bengal, Punjab, Rajasthan, Chhattisgarh and Bihar.

However, most of them also said they will cooperate with the house listing phase of the Census.

The objective of the NPR is to create a comprehensive identity database of every usual resident in the country.

The database would contain demographic as well as biometric particulars, they said.

The notification for the house listing census and NPR exercise came recently amid furore over the contentious Citizenship Amendment Act (CAA).

The home ministry officials said most of the states have notified provisions related to the NPR.

The NPR is a register of usual residents of the country. It is being prepared at the local (village/sub-town), subdistrict, district, state and national levels under provisions of the Citizenship Act, 1955 and the Citizenship (Registration of Citizens and Issue of National Identity Cards) Rules, 2003.

The data for NPR was last collected in 2010 along with the house listing phase of the Census 2011. Updating of this data was done during 2015 by conducting door to door survey.

While updating the register in 2015, the government has asked details like Aadhaar and their mobile number.

This time, the information related to their driving licence and voter ID card may also be gathered, the officials said, adding that PAN card details will not be collected as part of this exercise.

Though information regarding the place of birth of parents will be sought, it is up to the residents whether to respond the question as it is voluntary.

For the purposes of the NPR, a 'resident' is defined as a person who has lived in a local area for the past six months or more, or a person who intends to reside in that area for the next six months.

The law compulsorily seeks to register every citizen of India and issue a national identity card.

The demographic details of every individual are required for every usual resident: name, relationship to head of household, father's name, mother's name, spouse's name (if married), sex, date of birth, marital status, place of birth, nationality (as declared), present address of usual residence, duration of stay at present address, permanent residential address, occupation, educational qualification.

The Union Cabinet has approved Rs 3,941.35 crore for the NPR exercise.

Bhopal, Mar 10: The number of MLAs who have resigned from the Congress in Madhya Pradesh climbed to 20 on Tuesday afternoon with another legislator quitting the ruling party, sources said.

While 19 MLAs, most of them believed to be loyal to expelled party leader Jyotiraditya Scindia, have sent their resignation letters via e-mail to Raj Bhavan, Bisahulal Singh submitted his resignation letter as an MLA to the Assembly speaker.

"We have received resignations of 19 MLAs through e-mails with attachments," a Raj Bhawan official told PTI.

Sources in Congress produced a copy of Bisahulal Singh's resignation letter which he submitted to the speaker.

Former chief minister and senior BJP leader later announced that Singh (65) has joined the BJP.