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To fight against novel coronavirus, scientists, including one of Indian-origin who studied the aerodynamics of infectious Covid-19 disease have shared steps to curb transmission during indoor activities.
“Wear a mask, stay six feet apart, avoid large gatherings. As the world awaits a safe and effective vaccine, controlling the Covid-19 pandemic hinges on widespread compliance with these public health guidelines,” said study researcher Abhishek Kumar from the University of Colorado Boulder in the US.
“But as colder weather forces people to spend more time indoors, blocking disease transmission will become more challenging than ever,” Kumar added.
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The study, presented at the 73rd Annual Meeting of the American Physical Society’s Division of Fluid Dynamics, suggests strategies for lowering risk based on a rigorous understanding of how infectious particles mix with air in confined spaces.
Research early in the pandemic focused on the role played by large, fast-falling droplets produced by coughing and sneezing. However, documented super-spreader events hinted that airborne transmission of tiny particles from everyday activities may also be a dangerous route of infection. Fifty-three of 61 singers in Washington state, for example, became infected after a 2.5-hour choir rehearsal in March.
Of 67 passengers who spent two hours on a bus with a Covid-19-infected individual in Zhejiang Province, China, 24 tested positive afterward.
The researchers found that when people speak or sing loudly, they produce dramatically larger numbers of micron-sized particles compared to when they use a normal voice. The particles produced during yelling, they found, greatly exceed the number produced during coughing.
In guinea pigs, they observed influenza can spread through contaminated dust particles. If the same is true for the SARS-CoV-2, the researchers said, then objects that release contaminated dust-like tissues may pose a risk.
The research focused on how the virus might spread during music performance. They discussed results from experiments designed to measure aerosol emission from instrumentalists.
According to the researchers, traveling to and from office buildings in passenger cars also poses an infection risk. Kenny Breuer and his collaborators at Brown University performed numerical simulations of how air moves through passenger car cabins to identify strategies that may reduce infection risk.
If air enters and exits a room at points far away from passengers, then it may reduce the risk of transmission. In a passenger car, they said, that means strategically opening some windows and closing others.
The researchers said that staying six feet apart “offers little protection from pathogen-bearing aerosol droplets sufficiently small to be continuously mixed through an indoor space.”
“A better, flow-dynamics-based understanding of how infected particles move through a room may ultimately yield smarter strategies for reducing transmission,” the authors wrote. (IANS)
By Devakinanda Ji
Derived from the Sanskrit word muc ("to free"), the term moksha literally means freedom from samsara, release from the cycle of rebirth impelled by the law of karma. The transcendent state attained as a result of being released from the cycle of rebirth.
62) OṀ MOKṢHASĀDHAKABHŨMYAI NAMAH:
OṀ (AUM)-MOK-ṢHA-SAA-DHA-KA-BHOO-MYAI— NA-MA-HA
ॐ मोक्षसाधकभूम्यै नमः
(Mokṣha: Liberation, not returning to saṃsāra; Sādhaka: Seeking, spiritual discipline)
Mokṣha is liberation from the trans-migratory existence and from the cycle of birth and death (what we call saṃsāra). The topic of bandha (bondage) and mokṣha (liberation) has been widely discussed in all the systems of Hindu philosophy. It is the last pursuit of the human goals in life. The synonyms for mokṣha are: mukti, kaivalya and nirvāṇa.
There are other schools which advocate nishkāma karma (action not motivated by selfish desires) or bhakti (devotion to God resulting in His grace) as the means to mokṣha.
Bhārata bhumi is conducive for the practice of one or all the paths enjoined by the Vedas, i.e., Karma yoga, Rāja yoga, Bhakti yoga and Jnāna yoga. To pursue these paths, we have thousands and thousands of temples, puṇyatīrthās, discourses by swamīs and gurus and many others. We have the Vedas, Upanishads, purāṇas, Brahmasūtrās, āgamās and many more sacred texts and literature for answers and clarifications. Beyond showing us the paths to liberation, our scriptures tell us how to be liberated while living. One cannot ask anything better than that. The prayers from the Upanishads, is apt: 'Asatomā satgamayā; tamasomā jyotirgamayā' meaning- 'lead me from unreality to reality and from darkness to light'. Here spiritual ignorance is compared to darkness, and self-knowledge is compared to light.
The land which teaches us to worship God with 'karmaphala tyāgam, niṣhkāmakarmam, Īsvarārpaṇa buddhi' and attain 'mokṣham' is thus 'Mokṣhasādhaka Bhūmi'.
The Indian space agency is working on a fleet of medium to heavy lift rockets with a carrying capacity ranging from 4.9 ton to 16.3 ton, said a senior official. The five rockets are in the project report stage and would come into operation in the future, said N Sudheer Kumar, Director, Capacity Building Programme Office (CBPO), Indian Space Research Organisation (ISRO). He was speaking at the International Space Conference and Exhibition, organised by Confederation of Indian Industry (CII) in virtual mode recently. When that happens ISRO can not only launch its own communication satellites but also enter the global communication satellite launch market.
Kumar also said ISRO is working on upgrading Geosynchronous Satellite Launch Vehicle-Mk III (GSLV-Mk III) which can carry up to four ton to Geo Transfer Orbit (GTO). Normally rockets eject the communication satellites into GTO. From GTO the satellites will be taken to geostationary orbit by firing their engines. India uses Ariancespace's Ariane rocket to orbit its communication satellites weighing over four ton. According to Kumar, ISRO is also working on upgrading the lifting capacity of GSLV-Mk III to six ton and 7.5 to GTO.
The Indian space agency is working on a fleet of medium to heavy lift rockets with a carrying capacity ranging from 4.9 ton to 16.3 ton, said a senior official. | Photo by Laurent Grattepanche on Unsplash
He said the six ton lift capacity will be achieved by miniaturization of avionics, uprating of its three stages/engines, structural mass optimisation and other means. Kumar said ISRO is on the verge of realising its semi-cryogenic engine - engine fueled by pure kerosene- which will soon power GSLV-Mk III so that the rocket can carry 7.5 ton payload to GTO with an upgraded cryogenic engine. (IANS/ MBI)
Keywords: ISRO, heavy, ton, rockets, GSLV, fleet, India
In the recent past, Kalamkari has suddenly gained prominence in the wardrobes of Indian women. Commercial hubs in the city are filled with mannequins posing in kalamkari blouses, or sarees stretching out for yards on hangers.
As the name suggests, 'kalamkari' means 'craft from a pen'. Artisans draw on cloth with a pen, and colour it in with paints. This art form originated from the Mughal era and many of the scenes that artists choose to draw are scenes from Mughal gardens or palaces.
The Mughals were great patrons of art, and were known for their unique painting techniques. They would use a single haired brush to elaborate scenes from battle or from mythology. This technique was adopted by artisans of Hyderabad, who use a tamarind twig to paint cloth.
An artisan drawing with a tamarind twig on cloth with dyes Image source: wikimedia commons
These days, apart from mythology, kalamkari depicts scenes from everyday life too. The face of the Kathakali dancer, a pair of earrings, and the enlightened face of Buddha are some famous designs that people are seen wearing. The colours are usually dark blue, brown, olive green, or deep red.
Kalamkari, a 23-step dye process, is done in two different ways. The Kalahasti art type was a household form, where a brush is used to manually paint in the designs. Srikalahasti is an important center in Andhra Pradesh for this type of art. The Machilipatnam art form involves block painting, where designs are drawn on wooden blocks, dipped in the dye, and pressed on the fabric.
Kalamkari artist using wooden blocks to stamp designs on a sari Image source: wikimedia commons
One of the reasons why this handicraft has suddenly become popular could be due to the sustainable quality of its dyes and fabric. Kalamkari uses natural vegetable dyes and preferably cotton fabric as the base. It has grown as an art form, and in the fashion industry, it is being revered as an indigenous inclusion of heritage on an international platform.
Keywords: Kalamkari, Mughal, Art forms, Block painting, Andhra Pradesh