Six feet distancing not enough to stop coronavirus transmission in light winds: Study

News Network
May 20, 2020

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.

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April 9,2020

Washington, Apr 9: At least 11 Indians have died of COVID-19 in the United States with another 16 testing positive for the infection which has claimed more than 14,000 lives and afflicted more than four lakh people in the US.

All Indian citizens who have succumbed to the deadly infection in the US are male, with ten of them from New York and New Jersey area. Four of the victims are said to be taxi drivers in New York City.

New York City has emerged as the US epicentre for COVID-19 spurt, accounting for more than 6,000 deaths and over 1,38,000 cases of infections. New Jersey accounts for 1,500 fatalities and nearly 48,000 infections.

One Indian national reportedly died in Florida because of coronavirus. Authorities are also ascertaining the nationality of some other Indian origin people in the States of California and Texas.

All 16 Indians, including four females, who have tested positive for coronavirus are in self-quarantine. Coming from diverse background, eight of them are from New York, three from New Jersey and rest from other states like Texas and California. They hail from Indian states like Uttarakhand, Maharashtra, Karnataka and Uttar Pradesh.

Indian Embassy and consulates across the United States are working closely with local authorities and Indian-American organizations to provide necessary assistance to Indian nationals and students affected with COVID-19.

Because of the strict travel restrictions and regulations to prevent the spread of the deadly virus, local city officials have been performing the last rites of the deceased and in many cases are not allowing even their immediate family members to attend their cremations, officials said.

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News Network
January 31,2020

New Delhi, Jan 31: Chief Economic Adviser K V Subramanian on Friday said India's GDP is expected to grow at 6-6.5 per cent next fiscal as the economic slowdown has bottomed out.

As per the first advance estimates released by the National Statistical Organisation (NSO), the country's economic growth is likely to hit an 11-year low of 5 per cent in the current fiscal ending March 2020.

The Economic Survey 2019-20, prepared by a team lead by Subramanian, has projected the GDP to expand in the range of 6-6.5 per cent during 2020-21.

The Indian economy has hit the bottom and it will see an uptick from here, he said in a media briefing post the Economic Survey.

Amidst a weak environment for global manufacturing, trade and demand, the Indian economy slowed down with GDP growth moderating to 4.8 per cent in the first half of 2019-20, lower than 6.2 per cent in H2 of 2018-19.

Based on NSO's first advance estimates of GDP growth for 2019-20 at 5 per cent, an uptick in GDP growth is expected in the second half of the fiscal, it said.

According to it, the uptick in second half of 2019-20 would be mainly due to ten positive factors like picking up of Nifty India Consumption Index for the first time this year, an upbeat secondary market, higher FDI flows, build-up of demand pressure, positive outlook for rural consumption, rebound of industrial activity, steady improvement in manufacturing, growth in merchandise exports, higher build-up of foreign exchange reserves and positive growth rate of GST revenue collection.

The survey also emphasised that merger of public sector banks may increase the financial strength of the merged entities, lower the risk aversion and result in lowering of lending rates.

Further, as the implementation of GST further settles down, the increased unification of the domestic market may reduce business costs and facilitate fresh investment.

Reforms in land and labour market may further reduce business costs, said the survey, presented a day before Sitharaman's Union Budget 2020-21.

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News Network
January 22,2020

Jan 22: India's ranking in the latest global Democracy Index has dropped 10 places to the 51st spot out of 167 owing to violent protests and threats to civil liberties challenging freedoms across the country.

Prime Minister Narendra Modi's government has been criticized by rights groups and western governments after shutting off the internet and mobile phone networks and detaining opposition politicians in Kashmir.

Modi’s government has also responded harshly to ongoing protests against a controversial, religion-based citizenship law. Muslims have said their neighborhoods have been targeted, while the central government has attempted to ban protests and urged TV news channels not to broadcast “anti-national” content. Some leaders in Modi’s ruling party called for “revenge” against protesters. India’s score in 2019 was its worst ranking since the EIU’s records began in 2006, and has fallen gradually since Modi was elected in 2014.

The Economist Intelligence Unit’s 2019 Democracy Index, which provides an annual comparative analysis of political systems across 165 countries and two territories, said the past year was the bleakest for democracies since the research firm began compiling the list in 2006.

“The 2019 result is even worse than that recorded in 2010, in the wake of the global economic and financial crisis,” the research group said in releasing the report on Wednesday.

The average global score slipped to 5.44 out of a possible 10 -- from 5.48 in 2018 -- driven mainly by “sharp regressions” in Latin America, Sub-Saharan Africa, the Middle East and North Africa. Apart from coup-prone Thailand, which improved its score after holding an election last year, there were also notable declines in Asia after a tumultuous period of protests and new measures restricting freedom across the region’s democracies.

Asia Declines

Hong Kong, meanwhile, fell three places to rank 75th out of 167 as more than seven months of violent and disruptive protests rocked the Asian financial hub. An aggressive police response early in the unrest, when protests were mostly peaceful, led to a “marked decline in confidence in government -- the main factor behind the decline in the territory’s score in our 2019 index,” the group said.

In Singapore, which ranked alongside Hong Kong at 75th, a new “fake news” law led to a deteriorating score on civil liberties.

“The government claims that the law was enacted simply to prevent the dissemination of false news, but it threatens freedom of expression in Singapore, as it can be used to curtail political debate and silence critics of the government,” EIU analysts said.

China’s score fell to just 2.26 in the EIU’s ranking, placing it near the bottom of the list at 153, as discrimination against minorities, repression and surveillance of the population intensified. Still, in China “the majority of the population is unconvinced that democracy would benefit the economy, and support for democratic ideals is absent,” the EIU said.

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