NCERT talent search exams: Centre approves reservation for OBC students

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.

Srinagar, Mar 7: Two more accused, including a man who allegedly bought chemicals online for making improvised explosive device (IED) to be used in an attack on a convoy of the Central Reserve Police Force (CRPF) in Jammu and Kashmir's Pulwama last year, were arrested by the National Investigation Agency (NIA) on Friday, an official said.

The terror attack left 40 CRPF personnel dead in south Kashmir's Pulwama last year.

Waiz-ul-Islam, 19, from Srinagar and Mohammad Abbass Rather, 32, from Pulwama were arrested by the NIA, taking the number of those arrested in the case in the past week to five.

"During initial interrogation, Islam disclosed that he used his Amazon online shopping account to procure chemicals for making IEDs, batteries and other accessories on the directions of Pakistani Jaish-e-Mohammed (JeM) terrorists," the official said.

He said Islam personally delivered the items to the JeM terrorists after buying them online as a part of the conspiracy to carry out the attack.

"Rather is an old overground worker of the JeM. He has disclosed that he gave shelter at his home to Jaish terrorist and IED expert Mohd Umar after he came to Kashmir in April-May 2018," the official said.

Rather also sheltered other JeM terrorists - suicide bomber Adil Ahmad Dar, Sameer Ahmed Dar and Kamran, a Pakistani -- at his house before the Pulwama attack, the official said.

"He also facilitated safe shelter for the JeM terrorists, including Adil, at the house of accused Tariq Ahmed Shah and his daughter Insha Jan of Hakripora, who were arrested on March 3," the official said.

He said Islam and Rather will be produced before the NIA special court in Jammu on Saturday, while further investigation in the case continues. The NIA took over the case to probe the conspiracy behind the February 14, 2019, attack in Pulwama.

The last video of Adil, which was released by the JeM from Pakistan after the terror attack, was filmed at the home of Tariq Ahmed Shah. On February 28, the NIA achieved a major breakthrough in the case when it arrested 22-year-old Shakir Bashir Magrey, a furniture shop owner and resident of Pulwama.

Magrey had given shelter and other logistical assistance to suicide bomber Adil. He was introduced to Adil in mid-2018 by Pakistani terrorist Mohammad Umar Farooq and he became a full-time OGW of the JeM.

The explosives used in the attack were determined through forensic probe to be ammonium nitrate, nitro-glycerin and RDX. During investigation into the attack, the identity of the suicide bomber to be Adil Ahmad Dar was confirmed through DNA matching with that of his father.

The other key terrorists involved in the attack have been found to be JeM's south Kashmir divisional head Muddasir Ahmad Khan, killed in an operation by the security forces on March 11 last year; Pakistani terrorists Muhammad Umar Farooq and IED expert Kamran, both killed on March 29 last year; the owner of the car Sajjad Ahmad Bhat, a resident of Anantnag who was killed on June 16 last year, and Qari Yassir, JeM's commander for Kashmir who was killed on January 25 this year.

New Delhi, Jan 1: The new Army chief Lieutenant General MM Naravane on Wednesday said that India needs to pay more attention to its border along China and asserted that the force is capable of dealing with any security challenge.

"We have been giving attention to our western front in the past. The northern front now also requires an equal amount of attention... The Army is capable of tackling any dangers to the country," General Naravane told reporters after receiving the first Guard of Honour as the Army chief.

"In that context, we are now going in for capability development and enhancement of our capacities even in our northern borders which includes the northeastern part of our country," he said.

On the border dispute with China, the Army chief said that continuing peace along the border will pave the way for a solution.

He said: "We have been able to maintain peace and tranquility along borders and I'm sure that situation will prevail. By maintaining this, we will be able to set the stage for the eventual solution."

General Naravane said that operational readiness and modernisation will be among the top priorities of the Army under his leadership.

"Our priority will be to be ready to meet any challenge and to be operationally prepared at all times. This will happen as a result of modernisation. We will continue to build our capability especially in the North and Northeast region of our country," he said.

He said that the Indian Army will pay special attention to respect human rights. "We will also pay special emphasis on raising security awareness among ranks and file and pay special attention to respect human rights," the Army chief said.

Assuring the country on security, he said, "All three services — the Army, the Navy and the Air Force — are ready to defend the country."

He extended wishes to people in the new year and hoped that the country will make huge progress in this decade.

General Naravane took over as the 28th Chief of the Army Staff (COAS) on Tuesday, succeeding General Bipin Rawat who has become India's first Chief of Defence Staff (CDS).

General Naravane was previously the Vice Chief of Army Staff.