Pregnant goat dies after alleged gang-rape by eight men

New Delhi, Mar 15: The new rules for debit and credit cards to increase security and reduce frauds kick in from Monday. In January, the Reserve Bank of India (RBI) had issued new rules to improve user convenience and increase the security of card transactions. These rules will help in curbing the misuse of debit and credit cards.

RBI has directed banks to allow only domestic card transactions at ATMs and PoS terminals in India at the time of issuance/reissuance of card. For international transactions, online transactions, card-not-present transactions and contactless transactions, customers will have to separately set up services on their card.

These rules will be applicable for new cards from March 16. Those with old cards can decide whether to disable any of these features.

As per the existing rules, these services used to come automatically with the card, but now it will start at the request of the customer.

Debit or credit card customers who have not yet done any online transaction, contactless transaction or international transaction with the card, then these services on the card will automatically stop from March 16.

The Reserve Bank has asked all banks to provide mobile banking, net banking option to enable limit and enable and disable service 24 hours a day, seven days a week.

If the customer makes any change in the status of the card, the bank will alert the customer through SMS/email and send the information.

Issuers shall provide to all cardholders facility to switch on/off and set/modify transaction limits (within the overall card limit, if any, set by the issuer) for all types of transactions -- domestic and international, at PoS/ATMs/online transactions/contactless transactions, etc.,

The provisions, however, are not mandatory for prepaid gift cards and those used at mass transit systems.

The latest instructions come in the wake of rising instances of cyber frauds and the huge increase in the use of cards.

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.