Many flights delayed as dust storm sweeps UAE

Riyadh, Apr 8: Saudi Arabia's health minister has warned the number of COVID-19 cases in the country could reach 200,000 in coming weeks.

As of Tuesday, the kingdom registered a total of 2,795 coronavirus infections, including 41 deaths.

"Within the next few weeks, studies predict the number of infections will range from a minimum of 10,000 to a maximum of 200,000," health minister Tawfiq al-Rabiah was cited as saying by the official Saudi Press Agency on Tuesday.

On Monday, Saudi Arabia extended the duration of daily curfews in four governorates and five cities to 24 hours.

The kingdom imposed round-the-clock lockdowns in the capital Riyadh, Tabuk, Dammam, Dhahran and Hofuf, the interior ministry said on Twitter.

The same measures were also imposed on the governorates of Jeddah, Taif, Qatif and Khobar, the ministry added.

Authorities had already sealed off the holy cities of Mecca and Medina, barring people from entering and exiting as well as prohibiting movement between all provinces.

Last month, Saudi Arabia suspended the year-round "Umrah" pilgrimage over fears of the coronavirus pandemic spreading to Islam's holiest cities.

Authorities are yet to announce whether they will proceed with this year's Hajj, scheduled for the end of July. Last week, authorities urged Muslims to temporarily defer preparations for the annual pilgrimage.

Last year, about 2.5 million people travelled to Saudi Arabia to take part in the Hajj, which all Muslims must perform at least once in their lives if able.

The Arab world's biggest economy has also closed down cinemas, malls and restaurants and halted flights as it steps up efforts to contain the virus.

King Salman has warned of a "more difficult" fight ahead against the virus, as the kingdom faces the economic double blow of virus-led shutdowns and crashing oil prices

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, 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.