88 airports to be functional under UDAN, says minister

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study

Bengaluru, Jun 7: A mobile app and a portal offering technology-driven solutions to manage and mitigate floods in urban areas were launched here on Saturday by Karnataka Revenue Minister R Ashoka.

The mobile app 'Bengaluru Megha Sandesha' was developed to disseminate information on rainfall and flood forecast, location-specific dynamic weather directly to the public. "The in-built features of the app and the information provided for a city is the first of its kind in the country," a press release said. This is a system of providing rainfall, flood forecasts and early warning to the officials of government agencies in the city through SMS to their mobile phones, social media platforms and a dedicated web portal, the release said.

The information provided would help the civic authorities act in advance and manage the floods, it said. The portal 'Varunamitra' is for information on the weather. The information provided is based on real-time data from 100 telemetric rain gauges installed and maintained at various locations across the state, it said. Rainfall forecast is based on the weather research and forecast models developed by the Indian Space Research Organisation (ISRO), Ahmedabad, the release said.

The information on flood forecast is based on the hydrological model, hydraulic routing and automation of the results. The Karnataka State Natural Disaster Monitoring Centre, along with the Indian Institute of Science (IISc), took up this project on the urban flood model for Bengaluru city. The project was funded by the Central government's department of science and technology, the release added. 

Mangaluru/Udupi, May 28: Coastal Karnataka witnessed further spike in covid-19 cases today with 27 people testing positive for coronavirus in Udupi and six in Dakshina Kannada. 

Among 27 coronavirus patients in Udupi 18 are males and 9 females. Among them 24 have come from Maharashtra, two from Telangana and one from Kerala. All of them were under quarantine.

As many as 147 confirmed cases of coronavirus have been reported so far in the district, including a death. Three have recovered, and 143 are active.

In Dakshina Kannada, 2 females aged 18 and 62, and four males aged 25, 36, 50 and 61, are the ones to be tested positive. All the six persons to test positive are Maharashtra returnees.

With this, the number of cases in DK has increased to 87, out of which 51 are currently active. As many as 29 persons have recovered and been discharged, and seven deaths have occurred so far.