Two get death, Abu Salem, another get life term in 1993 Mumbai blasts case

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.

New Delhi, May 14: With a spike of 3,722 new cases in the last 24 hours, the COVID-19 count in India reached 78,003 on Thursday morning, according to the Ministry of Health and Family Welfare.

As per the latest update by the Ministry, there are 49,219 active cases in the country while 26,235 patients have been cured and discharged, and one migrated, so far.

With 134 new deaths being reported due to the disease since yesterday, the toll due to the disease reached 2,549.

With 25,922 confirmed cases, Maharashtra is the worst affected by the infection in the country so far.

Gujarat and Tamil Nadu, with 9,267 and 9,227, cases respectively are the next worst affected by the disease.

The national capital, Delhi, is just a couple of cases behind the 8 thousand mark as per the update on Thursday morning.

New Delhi, Jul 7: The University Grants Commission (UGC) has issued revised guidelines regarding the conduct of terminal semesters and final year exams by Universities and educational institutions. It has been suggested that exams may be completed by September in online or offline modes.

Releasing a statement, the UGC said it accepted the recommendations suggested by the expert committee. "In continuation to earlier Guidelines issued on 29.04.2020 and based on the Report of the Expert Committee, the UGC Revised Guidelines on Examination and Academic Calendar for the Universities in view of COVID-19 Pandemic were also approved by the Commission in its emergent meeting held on 6th July 2020," the statement read.

The Commission further said that while it was important to safeguard principles of health, safety and equal opportunities, it was also very important to ensure academic credibility, career opportunities and future progress of students.

"The Commission approved the recommendations of the Expert Committee regarding the conduct of terminal semester(s)/ final year(s) examinations by the universities/ institutions to be completed by the end of September 2020 in offline (pen & paper online/ blended (online + offline) mode," it added.

The UGC also said that if required it would also issue relevant details related to admissions and academic calendar in the universities and colleges. It asked the students to adopt the latest guidelines and complete the terminal semester or final year exams accordingly.