Encroachment of Wakf land in Mangaluru: BJP leader’s multi-crore complex raises eyebrows

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, Jun 12: Karnataka on Friday reported 464 discharges, its highest, as the state confirmed 271 new cases of COVID-19 and seven related fatalities, taking the total number of infections to 6,516 and the death toll to 79.

In a significant development, the day also saw the total number of discharges overtaking the number of active cases in the state.

As of June 12 evening, cumulatively 6,516 COVID-19 positive cases have been confirmed in the state, which includes 79 deaths and 3,440 discharges, the Health department said in its bulletin.

It said, out of 2,995 active cases, 2,976 patients are in isolation at designated hospitals and are stable, while 19 are in ICU.

The seven deaths include four from Bengaluru, two from Kalaburagi and one from Hassan.

Those from Bengaluru are three women aged 61, 65 and 49 and a 52-year old man.

Among the dead from Kalaburagi are two men aged 53 and 48 while a 60-year old man from Hassan also succumbed to the virus.

Out of 271 new cases, 92 are returnees from other states, majority of them from neighbouring Maharashtra.

While 14 are those who returned from other countries.

Among the districts where the new cases were reported, Ballari accounted for 97 cases, followed by Bengaluru urban 36, Udupi 22, Kalaburagi 20, Dharwad 19, Dakshina Kannada 17, Bidar 10, nine each from Hassan and Mysuru, Tumakuru 7, Shivamogga 6, four each from Raichur and Uttara Kannada, three each from Chitradurga and Ramanagara, Mandya 2, and one each from Belagavi, Vijayapura and Kolar.

Udupi district tops the list of positive cases, with a total of 991 infections, followed by Kalaburagi (816) and Yadgir (735).

Among discharges also Udupi tops the list with a total of 474, followed by Kalaburagi (345) and Bengaluru urban (299).

A total of 4,26,341 samples have been tested so far, with 9,835 on Friday alone.

So far 4,11,244 samples have been reported as negative, and out of them 9,139 were reported negative today.

Belagavi, Feb 11: Tension prevailed for sometime here after a few villagers spotted four country-made pistols disposed in the garbage site by the road between Markandey Nagar – Waghavade village on Sunday. Police rushed to the spot and seized the arms which are believed to be of Portugal era.

Sources said some villagers noticed a pistol lying along with heaps of refuse. They informed Bhavakanna Patil, the owner of the agricultural field adjacent to the garbage site. Patil and the villagers checked the garbage and found three more pistols totalling four.

Police said the pistols are about 50 to 60 years old. Going by their condition, all rusted, it is believed that they were left unused for a long time. The Belagavi rural police who have filed a suo motu case related to the incident are getting into the skin of case to trace the owners and those who disposed them in the garbage pit. 

According to preliminary investigation, it is learnt that such pistols were in vogue during Portugal rule in Goa. There are chances that those who inherited the arms may have disposed it for the fear of possessing weapon illegally. The chances of some notorious people who reside in the vicinity near Waghavade and surrounding areas, where burglaries and dacoity are frequently reported, disposing the arms due to the fear of police also cannot be ignored. Police Commissioner Lokesh Kumar was not available for comments.