Book on Mohan Alva released

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Feb 27: The Centre has adopted Prime Minister Narendra Modi's mantra of "Make in India', for India and the world" to build strong defence and security infrastructure in the country, said Defence Minister Rajnath Singh after inaugurating the new Light Combat Helicopter Production Hangar at Helicopter Division in Hindustan Aeronautics Limited (HAL) Complex here on Thursday.

According to an official statement, the Defence Minister said in the last five years, India has made significant progress towards manufacturing military equipment indigenously under the 'Make in India' initiative.

Stressing that the defence industry plays a major role in the economic development of the country, Singh lauded the significant contribution of organisations like HAL.

Highlighting the Rs 35,000 crore exports target set for the coming years, he expressed confidence that HAL, through its various platforms, will contribute significantly to achieve this milestone.

According to the statement, Rajnath Singh commended HAL for being the backbone of the Indian Air Force and meeting the requirements of the Armed Forces.

"The HAL has excelled both in operations and finance in the last five years. It has achieved operational clearance on seven platforms, including Light Combat Aircraft and Light Combat Helicopter, and overhauled platforms like Hawk and SU 30 MKI," he said.

He also appreciated that HAL had a turnover of Rs 19,705 crore till March 2019 and it gave shareholders a healthy dividend of 198 per cent.

HAL also apprised the Defence Minister on the progress of the new design and development programme of indigenous Indian Multi-Role Helicopter (IMRH), the statement informed.

The full-scale mock-up was showcased to Rajnath Singh. The IMRH is proposed as a replacement to the existing medium-lift helicopters such as Mi17's, Kamovs and Seakings which will phase out in the next eight to ten years.

LCH is a 5.5-tonne class combat helicopter designed and developed by HAL. It is powered by two Shakti engines and inherits many technical features of the Advanced Light Helicopter. LCH has the distinction of being the first attack helicopter to land in Forward Bases at Siachen, 4,700 mts above sea level with 500kg load.

Bengaluru, May 3: Renowned Kannada poet KS Nissar Ahmed passed away on May 3.

Winner of several awards including Karnataka Sahitya Akademi Award for Poetry, Rajyotsava Award, Padma Shri among others, Ahmed died at the age of 84