Jehangir Sabavala work sells for Rs. 2.16 crores in London

The total number of global coronavirus cases has topped 15.4 million, while the deaths have increased to over 631,000, according to the Johns Hopkins University.

As of Friday morning, the total number of cases stood at 15,439,456, while the fatalities rose to 631,926, the University's Center for Systems Science and Engineering (CSSE) revealed in its latest update.

The US accounted for the world's highest number of infections and fatalities at 4,034,831 and 144,242, respectively, according to the CSSE.

Brazil came in the second place with 2,287,475 infections and 84,082 deaths.

In terms of cases, India ranks third (1,238,798), and is followed by Russia (793,720), South Africa (408,052), Peru (371,096), Mexico (370,712), Chile (334,683), the UK (298,721), Iran (284,034), Spain (270,166), Pakistan (269,191), Saudi Arabia (260,394), Italy (245,338), Turkey (223,315), Colombia (218,428), France (216,667), Bangladesh (216,110), Germany (204,881), Argentina (148,027), Canada (114,398), Qatar (108,244) and Iraq (102,226), the CSSE figures showed.

The other countries with over 10,000 deaths are the UK (45,639), Mexico (41,908), Italy (35,092), France (30,185), India (29,861), Spain (28,429), Iran (15,074), Peru (17,654) and Russia (12,873).

Islamabad, Jan 3: The United Arab Emirates has extended USD 200 million aid to Pakistan for the development of the small and medium-sized enterprises in the country, Finance Adviser to Prime Minister Imran Khan said.

The announcement came after Abu Dhabi Crown Prince Sheikh Mohamed Bin Zayed Al Nahyan concluded his one-day visit to the country on Thursday.

"The money will be spent on small business promotion and jobs. This support is testimony to the expanding economic relations and friendship between our countries," the adviser, Abdul Hafeez Shaikh, on Thursday said.

The Crown Prince directed the Khalifa Fund for Enterprise Development to allocate USD 200 million in order to assist the Pakistani government's efforts to create a stable and balanced national economy that will help achieve the country's sustainable development, Dawn News reported on Friday.

During the visit, the prince met Prime Minister Khan and held talks on bilateral, regional and international issues.

The UAE is Pakistan's largest trading partner in the Middle East and a major source of investments. The UAE is also among Pakistan's prime development partners in education, health and energy sectors.

It hosts more than 1.6 million expatriate Pakistani community, which contributes remittances of around USD 4.5 billion annually to the GDP.

This is the Crown Prince's second visit to Pakistan since Khan took office in August 2018. He had last visited Pakistan on January 6 last year, just weeks after his country offered USD 3 billion financial assistance to Pakistan to deal with its balance of payment crisis.

The Crown Prince's visit was considered by experts as an attempt to woo Pakistan against the backdrop of recent developments when Saudi Arabia and UAE apparently used pressure to stop Pakistan from attending the Kuala Lumpur summit held last month.

The summit from December 19-21 was seen by Saudis as an attempt to create a new bloc in the Muslim world that could become an alternative to the dysfunctional Organisation of Islamic Cooperation led by the Gulf Kingdom.

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.