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New Delhi, Jan 9: The Union government has removed the central security cover of Tamil Nadu Deputy Chief Minister O Paneerselvam and DMK leader M K Stalin, officials said on Thursday.

They said while Paneerselvam had a smaller 'Y+' cover of central paramilitary commandos, Stalin had a larger 'Z+' protection.

The security cover of these two politicians has been taken off from the central security list after a threat assessment review was made by central security agencies and approved by the Union home ministry, they said.

Central Reserve Police Force (CRPF) commandos were protecting these two leaders of Tamil Nadu.

However, they said, the central security cover will be formally taken off after the state police takes over their security task, they added.

New Delhi, Jan 5: A masked mob on Sunday entered the Sabarmati Hostel on the Jawaharlal Nehru University (JNU) campus and assaulted several students and professors with sticks and rods.

"I have been brutally attacked by goons wearing masks. I am bleeding. I was brutally beaten up," JNU Students' Union (JNUSU) president Aishe Ghosh told reporters.

She has been admitted to the AIIMS here for treatment.

Several other students were also injured in the incident.

In a video of the incident, a group of goons with their faces covered can be seen assaulting students with wooden sticks and rods.

A tweet from the official handle of the JNUSU said, "Sabarmati Hostel: right now. They are beating the students who are inside. Knocking on doors with rods. People are jumping from balconies. #SOSJNU #EmergencyinJNU."

"Professors who were trying to protect us have been beaten up. These are unknown ABVP goons, not all are students, they have covered their faces, and they are moving towards the hotels near the West Gate. Stay alert. Make human chains. Protect each other. #SOSJNU #EmergencyinJNU," another tweet added.

Meanwhile, the ABVP's JNU unit claimed in a tweet: "Emergency in JNU. Leftist goons of JNU accompained with their cadre from other universities have crossed every limit. They have proceeded with unimaginable violence on ABVP activists of JNU."

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.