Six feet distancing not enough to stop coronavirus transmission in light winds: Study

News Network
May 20, 2020

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.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
April 26,2024

phase2.jpg

Voting has begun in 88 constituencies across 13 states and Union Territories amid a furious row between the Congress and the BJP over manifesto and inheritance tax. Election will be held on all seats of Kerala, a chunk of Rajasthan and UP.

Key points

Elections for the second phase will be held for 20 seats of Kerala, 14 seats in Karnataka, 13 in Rajasthan, eight each in Uttar Pradesh and Maharashtra, seven in Madhya Pradesh, five each in Assam and Bihar, three each in Bengal and Chhattisgarh and one each in Jammu and Kashmir, Manipur and Tripura.

Earlier, 89 constituencies were expected to vote in this phase. But polling in Betul, Madhya Pradesh, was rescheduled after the death of a candidate from Mayawati's Bahujan Samaj Party. Betul will now vote in the third phase, due on May 7.

Key candidates for this round include the BJP's Union minister Rajeev Chandrashekhar  -- up against Congress' Shashi Tharoor from Thiruvananthapuram; actors Hema Malini, and Arun Govil from 1980s iconic serial Ramayan, senior BJP leader Tejasvi Surya and Lok Sabha Speaker Om Birla,  Congress' Rahul Gandhi, KC Venugopal, Bhupesh Baghel. and Ashok Gehlot's son Vaibhav Gehlot.

For both BJP and the Opposition, the most crucial states in this phase will be Karnataka and Kerala. Karnataka is the only BJP bastion in the south, where the Congress won in the last assembly election. The party is hoping to do well amid concerns about delimitation and the disadvantage southern states could face after it.

Further south, the BJP is trying to break into the bipolar politics of Kerala. The party is hoping to open its account in the state having fielded Union ministers Rajiv Chandrasekhar and V. Muraleedharan. In Wayanand, a Congress bastion for over 20 years, it has fielded its state unit president K Surendran against Rahul Gandhi.

For the Opposition, Kerala is a big shining hope. Even though the Left and the Congress are competing against each other in the southern state, victory by either will add to the tally of the Opposition bloc INDIA. Kerala is one of the few states that have never sent a BJP member to parliament.

With north, west and northeast India saturated, the BJP is hoping to expand in the south and east in their quest for 370 seats. The party had won 303 seats in 2019, a majority of them from the Hindi heartland and bastions new and old, including Gujarat and the northeast.

The Congress, though, has claimed it would post a much better performance compared to 2019. After the first phase of the election, their claims have got louder, especially in Rajasthan and western Uttar Pradesh. Rashtriya Janata Dal chief Tejashwi Yadav has claimed INDIA will win all five seats in Bihar.  

The election is being held amid a bitter face-off between the Congress and the BJP. The row was sparked by Prime Minister Narendra Modi's comment that the Congress, if voted to power, will redistribute the personal wealth of people among "infiltrators" and won't even spare the mangalsutras of women. The Congress has questioned if the people had to fear for their wealth and mangalsutras in 55 years of the party's rule and accused the BJP of sidestepping issues that matter.

The next phase of election is due on May 7. The counting of votes will be held on June 4 – three days after the seventh and last phase of election on June 1.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
May 3,2024

Bengaluru: In a fresh development in the alleged Hassan sex abuse case, JD(S) MLA H D Revanna, who was accused of sexually harassing his house help, has been booked for kidnapping a victim allegedly sexually assaulted by his son, Hassan MP Prajwal Revanna. The case was filed late Thursday evening at the KR Nagar police station in Mysuru.

The 20-year-old complainant from KR Nagara accused one Sathish Babanna of taking his mother away forcibly and keeping her in an unknown location at the behest of Revanna.

As per the FIR, Revanna has been named as accused 1 while Babanna was accused 2. The duo were booked under IPC Sections 364A (kidnapping for ransom), 365 (kidnapping or abducting with intent secretly and wrongfully to confine a person) and 34 (acts done by several persons in furtherance of common intention).

The complainant claimed that his mother, whose name and age were not revealed, had worked as a help in Revanna’s house and farm in Holenarasipura for six years, quit the job three years ago and returned to KR Nagara. She then worked for daily wages.

“Nearly three to four days before the Lok Sabha election, Sathish Babanna, who is known to us and hailed from our native place, took my mother to Holenarasipura after saying that Bhavani Revanna, the wife of MLA Revanna, had asked for her,” the complainant alleged, adding that Babanna dropped her back on the day of the polls.

Babanna allegedly told the victim’s mother and father to remain silent and evade the police if they came looking for them and to inform him of the developments.

On April 29, at around 9 pm, when the complainant was home, the suspect Babanna arrived, told the complainant’s mother that Revanna had asked for her and took her away on his motorcycle. The complainant claimed that he wasn’t aware of where Babanna took his mother and he had told him that if the police found her, a case would be registered and they would all go to jail.

On May 1, two of the complainant’s relatives called him on the phone and told him that there was a video of his mother being sexually assaulted by Prajwal and that it was a huge case, the FIR noted. He was also informed by his two friends of his "mother's videos being circulated".

When he asked Babanna later that night, he was allegedly told that there was a photo of his mother standing with a stick when Prajwal had quarrelled with someone earlier and an FIR had been registered. Babanna told the complainant that his mother would have to be released on bail, the FIR noted.

“Babanna told me not to speak on the matter on my phone and asked me to talk from a different phone,” he said, seeking action from the police.

The case has been transferred to the Special Investigation Team (SIT) set up to probe the Hassan sex scandal as per the government order.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
May 4,2024

Mangaluru, May 4: The Mangaluru International Airport was besieged with a harrowing message of terror recently, when an email, purportedly from malevolent elements, menacingly declared the planting of bombs within the airport premises. 

Addressed to the office of the airport authority, the missive, steeped in ominous overtones, bore the ominous signature of a terrorist faction, ominously named 'Terrorizers 111'.

The communication, disseminated in English, ominously detailed the clandestine emplacement of explosives in areas eluding facile detection, accompanied by a chilling warning of their imminent detonation. The threat, ominously looming over not only the infrastructure but also the airborne vessels, portended a catastrophic deluge of bloodshed and loss.

In response to this dire communiqué, airport authorities swiftly engaged the apparatus of law enforcement, dispatching urgent alerts to the vigilant guardians of public safety. Acting upon the dictates of higher echelons, a formal dossier of this menacing correspondence was meticulously compiled, cloaked in the veil of confidentiality to thwart any premature dissemination.

Mangaluru International Airport found itself in grim camaraderie with more than 30 counterparts under the aegis of the Airport Authority of India (AAI) and private domains, all recipients of this chilling electronic diatribe. A comprehensive net of precautionary measures was swiftly cast, fortifying the bastions of security in anticipation of any nefarious designs lurking within the shadows.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.