Azaan from mosques causes noise pollution: Tripura governor

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.

Ayodhya, Jul 23: All 32 accused in the Babri mosque demolition case should be invited to the "bhumi pujan" ceremony for the construction of the Ram temple here and honoured, a Hindutva outfit leader has said.

Hindu Dharma Sena president Santosh Dubey is one of the main accused in the case.

Dubey also insisted that the Shri Ram Janmabhoomi Teertha Kshetra Trust must also invite all the four Shankaracharyas to the ceremony planned on August 5.

Prime Minister Narendra Modi is also likely to attend the event.

"The office bearers of Ram Janmabhoomi Teerth Kshetra must ensure that along with all 32 accused in the Babri mosque demolition case, the families of the kar sevaks who gave their lives in the Ram Temple movement must also be invited to the 'bhumi pujan' ceremony and must be honoured there," Dubey told PTI.

The top court verdict in favour of the Ram temple at the site would not have been possible had the Babri mosque not been demolished, he said.

"If the Trust does not invite the kar sevaks, it will a display of ego and arrogance. Without inviting the kar sevaks who have been accused in Babri mosque demolition and the families of the slain kar sevaks, the 'bhumi pujan' will remain incomplete," Dubey added.

A special CBI court in Lucknow is recording the statements of the 32 Babri demolition accused under section 313 of the CrPC, which enables them to plead their innocence, if they so want.

The court is conducting day-to-day hearings to complete the trial by August 31 as directed by the Supreme Court.

The mosque in Ayodhya was demolished on December 6, 1992 by 'kar sevaks' who claimed that an ancient Ram temple had stood on the same site. Former deputy prime minister L K Advani and BJP leader Murli Manohar Joshi were leading the Ram temple movement at that time.

New Delhi, May 15: Microsoft founder Bill Gates on Friday thanked Prime Minister Narendra Modi for the interaction and stressed that combating the coronavirus pandemic requires global collaboration.

"Thank you for the conversation and partnership PM Narendra Modi. Combating the pandemic requires global collaboration. India's role is key as the world works to minimize social and economic impact, and pave the way to vaccine, testing, and treatment access for all," Bill Gates said.

Prime Minister Narendra Modi on Thursday interacted with philanthropist and Microsoft co-founder Bill Gates and discussed the global response to Covid-19 and the importance of global coordination on scientific innovation to combat the pandemic.

The Prime Minister underlined the conscious approach that India has adopted in its fight against the health crisis - an approach based on ensuring public engagement through appropriate messaging, a PMO release said.

He explained how this people-centric bottom-up approach has helped win acceptability for physical distancing, respect for frontline workers, wearing of masks, maintaining proper hygiene, and respecting lockdown provisions.

They agreed that given India's willingness and capacity to contribute to global efforts, particularly for benefit of fellow developing countries, it was important for India to be included in the ongoing global discussions for coordinating responses to the pandemic.

The Prime Minister also suggested that the Gates Foundation could take the lead in analyzing the necessary changes in lifestyles, economic organisation, social behaviour, modes of disseminating education and healthcare, that would emerge in the post-Covid world, and the associated technological challenges that would need to be addressed.

He said that India would be happy to contribute to such an analytical exercise based on its own experiences.