Sky enthusiasts gear up to watch eclipse of super blue blood moon

Jan 29: Multiple organisations have called for a Bharat Bandh today in order to protest against the recently passed Citizenship Amendment Act and the proposed National Register of Citizens (NRC). The Bharat  Bandh today has been organised in Surat in Gujarat, Jharkhand and Andhra Pradesh. Increased security measures have been put in place in the three states keeping in view the call for shutdown.

According to media reports, the call for Bharat Bandh was given by Maulana Sajjad Nomani of the All India Muslim Personal Law Board (AIMPLB). This was to protest against the controversial CAA-NRC. This call is supported by an NGO based in Surat, Versatile Minorities Forum (VMF). Apart from the VMF, the call for strikes has been supported by organizations such as Bahujan Kranti Morcha, National Association of Street Vendors of India Surat chapter and the Textile Market Workers' Union.

The workers of the VMF were also spotted distributing pamphlets and urging people to support the strike. Several shopkeepers have also put up notices stating that their shops will be shut for the day.

Earlier, Bharat Bandh was called by 10 trade unions and several bank employees in order to protest against the "anti-people policies of the government" on January 8 and 9. A few violent incidents during this Bharat Bandh were reported in West Bengal.

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.

Ahmedabad, Jul 23: Private schools in Gujarat have suspended online classes for an indefinite period from Thursday, after a state government order said they should not collect fees from students until the schools reopen.

In a notification issued last week, the Gujarat government directed self-financed schools in the state not to collect tuition fees from students as long as they remain shut in the wake of the COVID-19 pandemic.

It also asked these schools not to hike fees for the academic year 2020-21.

Unhappy with the move, a union of representing nearly 15,000 self-financed schools in Gujarat decided to put on hold online classes, an alternative arrangement started earlier this month for students.

Majority of these schools informed the parents through SMS on Wednesday night that there will not be any online classes for their wards from Thursday.

Self-financed School Management Association's spokesperson Dipak Rajyaguru on Thursday said almost all the self-financed schools in the state refrained from imparting online education.

"If the government believes online education is not real education, then there is no meaning of imparting such unreal education to our students. Online education will remain suspended until the government withdraws that notification," Rajyaguru said in a statement.

He said the association will also approach the high court against state government's decision.

Jatin Bharad, a prominent educationist and member of the association, said there is no alternative to online education in the present scenario.

"Self-financed schools need to pay salaries to the teachers and other staff. No state in India has taken such decision that fees cannot be collected despite conducting online classes. If we adhere to the state notification, it will be impossible for us to pay salaries and run the school.

Thus, we have decided to suspend the online classes," said Bharad said.