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Bengaluru, Jun 24: Three weeks after the BMTC resumed running air-conditioned buses in the state capital, the state-owned Karnataka State Road Transport Corporation (KSRTC) has announced plying AC buses to eight cities to begin with, including to Mangaluru and Mysuru, from Thursday.

From tomorrow travellers can travel to Mysuru, Mangaluru, Kundapura, Madikeri, Chikkamagaluru, Davanagere, Shivamogga and Virajpet in AC buses, KSRTC said in a statement released here.

Listing out the measures taken to check the spread of Covid-19, the Corporation said that the temperature inside the buses will be maintained at 24 to 25 degrees Celsius and no blankets will be provided in the night service buses.

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.

Bengaluru, Apr 11: Seven more people have tested positive for coronavirus taking the tally to 214 in the state.

"Coronavirus cases rise to 214 in Karnataka, with seven more people testing positive between 5 PM Friday and 12 PM Saturday," said the Karnataka health department.

According to the health department, all these seven people have a history of contact with COVID-19 patients. Five of them are workers of a pharmaceutical company in Mysuru.

"Out of the total cases in the state, six people have died while 37 others were cured or discharged," added the state health department.