Modi, Trump hold talks on defence, security issues

Jan 7: A Delhi Court today issued death warrant against four convicts in the 2012 Nirbhaya gang-rape and murder case. The hanging will take place on January 22 at 7 am.

During the hearing, the prosecution said there was no application pending before any court or the President right now by any of the convicts and the review petition of all the convicts was dismissed by the Supreme Court.

On Monday, the court had reserved order on issuing of death warrants against four death row convicts.

Today's order comes days after mother of the victim in the 2012 Delhi gang-rape and murder case moved the Supreme Court on opposing the plea filed by one of the four death-row convicts seeking review of its 2017 judgement awarding him death penalty.

The apex court had on July 9 last year dismissed the review pleas filed by the other three convicts — Mukesh (30), Pawan Gupta (23) and Vinay Sharma (24) — in the case, saying no grounds have been made out by them for review of the 2017 verdict.

The 23-year-old girl was gangraped and murdered by six men on a moving bus on 16 December 2012. The main accused, Ram Singh, allegedly committed suicide in Tihar Jail during the trial. Another accused was a minor at the time of the commission of the crime and was sent to a reform facility and released after three years.

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.

Washington, May 1: The United States on Thursday recorded 29,625 new coronavirus cases, and 2,035 deaths in the last 24 hours, according to Johns Hopkins University.

The total number of coronavirus cases has reached 1,069,534 and the death toll stands at 63,001, CNN reported.

The novel coronavirus has infected more than 3.2 million people and killed at least 233,000 globally, according to Johns Hopkins University.