Armed Forces veterans write to PM Modi condemning attack on Muslims, Dalits, Media 

Mangaluru, May 12: The Karnataka government has ordered that Dakshina Kannada and Udupi districts be considered as one unit for the movement of people to undertake permitted activities between 0700 hrs to and 1900 hrs.

Principal Secretary and Member Secretary, Karnataka State Disaster Management Authority, T K Anil Kumar, in an order, said that there was no need for different passes for commuting by people between these two districts.

However, people should carry their identity cards issued by their respective enterprises/ companies to show that they are carrying out permitted activities only, he said.

The government suspended all the India-bound air travel from China and has declared all visas 'invalid', on Monday, due to the rapid escalation of cases of novel coronavirus outbreak which originated in Wuhan.

"Embassy and our Consulates have been receiving several queries from Chinese citizens as well as other foreign nationals, who are based out of China or visited China in the last 2 weeks, as to whether they can use their valid single/multiple entry visas to travel to India," tweeted the Embassy of India in Beijing, China.

"It is clarified that existing visas are no longer valid. Intending visitors to India should contact the Indian Embassy in Beijing ([email protected]) or the Consulates in Shanghai ([email protected]) and Guangzhou ([email protected]) to apply afresh for an Indian visa," it said.

Further, regarding the validity of visas, the embassy said, "Indian Visa Application Centres (http://blsindia-china.com) in these cities may also be contacted in this regard. Visa Section of the Embassy/Consulates of India in China can be contacted to ascertain the validity of visa before undertaking any visit to India."

"All those who are already in India (with regular or e-visa) and had traveled from China after January 15 are requested to contact the hotline number of Ministry of Health and Family Welfare of Government of India (+91-11-23978046 and email: [email protected])," the embassy said.

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.