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Subject: Science and Technology

  • [pib] India’s nominations for 2020 World Heritage List

    Government of India has submitted two nomination dossiers namely ‘Dholavira: A Harappan City’ and ‘Monuments and Forts of Deccan Sultanate’ for inclusion in the World Heritage List for the year 2020.  Govt. of Madhya Pradesh has submitted the proposal of ‘Group of Monuments at Mandu’ in the year 2019.

    What are World Heritage Sites?

    • A World Heritage Site is a landmark or area, selected by the United Nations Educational, Scientific and Cultural Organization (UNESCO) for having cultural, historical, scientific or other forms of significance, which is legally protected by international treaties.
    • The sites are judged to be important for the collective and preservative interests of humanity.
    • To be selected, a WHS must be an already-classified landmark, unique in some respect as a geographically and historically identifiable place having special cultural or physical significance (such as an ancient ruin or historical structure, building, city, complex, desert, forest, island, lake, monument, mountain, or wilderness area).
    • It may signify a remarkable accomplishment of humanity, and serve as evidence of our intellectual history on the planet.
    • The sites are intended for practical conservation for posterity, which otherwise would be subject to risk from human or animal trespassing, unmonitored/uncontrolled/unrestricted access, or threat from local administrative negligence.
    • The list is maintained by the international World Heritage Program administered by the UNESCO World Heritage Committee, composed of 21 “states parties” that are elected by their General Assembly.

    UNESCO World Heritage Committee

    • The World Heritage Committee selects the sites to be listed as UNESCO World Heritage Sites, including the World Heritage List and the List of World Heritage in Danger.
    • It monitors the state of conservation of the World Heritage properties, defines the use of the World Heritage Fund and allocates financial assistance upon requests from States Parties.
    • It is composed of 21 states parties that are elected by the General Assembly of States Parties for a four-year term.
    • India is NOT a member of this Committee.
    • Recently, its 42nd meeting in 2018 was held in Manama Bahrain.

    Also read:

    https://www.civilsdaily.com/news/pib-india-gets-its-37th-unesco-world-heritage-site/

    https://www.civilsdaily.com/news/jaipur-gets-unesco-world-heritage-tag/

    https://www.civilsdaily.com/news/orchha-on-unesco-world-heritage-sites-tentative-list/

     

    Read more about the Tentative lists from India at:

    http://whc.unesco.org/en/statesparties/IN

  • What is the ‘Raman effect’?

     

     

    Yesterday, February 28th was celebrated as National Science Day. In 1986, the Govt. of India designated this Day, to commemorate the announcement of the discovery of the “Raman effect”.

    CV Raman

    • Raman conducted his Nobel-prize winning research at IACS, Calcutta.
    • While he was educated entirely in India, Raman travelled to London for the first time in 1921, where his reputation in the study of optics and acoustics was known to physicists such as JJ Thomson and Lord Rutherford.
    • The Raman Effect won scientist Sir CV Raman the Nobel Prize for physics in 1930.
    • It was also designated as an International Historic Chemical Landmark jointly by the American Chemical Society (ACS) and the Indian Association for the Cultivation of Science (IACS).
    • His speciality was the study of vibrations and sounds of stringed instruments such as the Indian veena and tambura, and Indian percussion instruments such as the tabla and mridangam.

    The Raman Effect

    • In 1928, Raman discovered that when a stream of light passes through a liquid, a fraction of the light scattered by the liquid is of a different colour.
    • While Raman was returning from London in a 15-day voyage, he started thinking about the colour of the deep blue Mediterranean.
    • He wasn’t convinced by the explanation that the colour of the sea was blue due to the reflection of the sky.
    • As the ship docked in Bombay, he sent a letter to the editor of the journal Nature, in which he penned down his thoughts on this.
    • Subsequently, Raman was able to show that the blue colour of the water was due to the scattering of the sunlight by water molecules.
    • By this time he was obsessed with the phenomenon of light scattering.

    Observing the effect

    • The Raman Effect is when the change in the energy of the light is affected by the vibrations of the molecule or material under observation, leading to a change in its wavelength.
    • Significantly, it notes that the Raman effect is “very weak” — this is because when the object in question is small (smaller than a few nanometres), the light will pass through it undisturbed.
    • But a few times in a billion, light waves may interact with the particle. This could also explain why it was not discovered before.
    • In general, when light interacts with an object, it can either be reflected, refracted or transmitted.
    • One of the things that scientists look at when light is scattered is if the particle it interacts with is able to change its energy.

    Applications

    • Raman spectroscopy is used in many varied fields – in fact, any application where non-destructive, microscopic, chemical analysis and imaging is required.
    • Whether the goal is qualitative or quantitative data, Raman analysis can provide key information easily and quickly.
    • It can be used to rapidly characterize the chemical composition and structure of a sample, whether solid, liquid, gas, gel, slurry or powder.

  • 2020 CD3: A mini-moon

     

     

    Astronomers have observed a small object orbiting Earth, which they have dubbed a “mini-moon” or the planet’s “second moon”.

    2020 CD3

    • The mini-moon was discovered by some astronomers at NASA-funded Catalina Sky Survey (CSS) in Arizona.
    • It is actually an asteroid, about the size of a car; its diameter is about 1.9-3.5 m.
    • And unlike our permanent Moon, the mini-moon is temporary; it will eventually break free of Earth’s orbit and go off on its own way.
    • Orbit integrations indicate that this object is temporarily bound to the Earth.
    • 2020 CD3 was captured into Earth’s orbit over three years ago.
    • For CSS, it is only the second such discovery. It previously discovered 2006 RH120, which orbited Earth for some time that year, before it escaped in 2007.

    Where do such moons come from?

    • When an asteroid’s orbit crosses Earth’s orbit, it can sometimes be captured into the latter orbit. This is what happened with 2020 CD3.
    • It is now orbiting at a distance farther from Earth. Such an asteroid is called a Temporarily Captured Object (TCO).
    • The orbit of such objects is unstable. They have to contend with the gravitational influence of our permanent Moon as well as that of the Sun.
    • Once caught in Earth’s orbit, such objects usually remain for a few years before they break free and go into independent orbit around the Sun.

  • [pib] Responsible AI for Social Empowerment (RAISE) 2020

     

     

    The Govt. has announced the mega event, RAISE 2020- ‘Responsible AI for Social Empowerment 2020,’ to be held in April in New Delhi.

    RAISE 2020

    • RAISE 2020 is a first of its kind, a global meeting of minds on Artificial Intelligence to drive India’s vision and roadmap for social empowerment, inclusion and transformation through responsible AI.
    • It is India’s first Artificial Intelligence summit to be organized by the Government in partnership with Industry & Academia.
    • The summit will be a global meeting of minds to exchange ideas and charter a course to use AI for social empowerment, inclusion and transformation in key areas like Healthcare, Agriculture, Education and Smart Mobility amongst other sectors.
    • It will facilitate an exchange of ideas to further create a mass awareness about the need to ethically develop and practice AI in the digital era.

  • Species in news: Henneguya Salminicola

     

     

    Researchers at Tel Aviv University have discovered a non-oxygen breathing animal, which significantly changes one of science’s assumptions about the animal world — that all animals use aerobic respiration and therefore, oxygen.

    Henneguya Salminicola

    • The organism is Henneguya salminicola, a fewer-than-10-celled microscopic parasite that lives in salmon muscle.
    • It relies on anaerobic respiration (through which cells extract energy without using oxygen).
    • In the case of this non-oxygen breathing organism, evolution turned it into a simpler organism that shed “unnecessary genes” responsible for aerobic respiration.
    • Other organisms such as fungi and amoebas that are found in anaerobic environments lost the ability to breathe over time.
    • The new study shows that the same can happen in the case of animals, too.

    What is Aerobic respiration?

    • Animals, including humans, need energy to perform the various tasks that are essential for survival.
    • Aerobic respiration is one such chemical reaction through which organisms take in oxygen and release carbon dioxide into the atmosphere.
    • Through this mechanism, energy is transferred to cells, which can use it for multiple purposes — for instance, to burn food.
    • Mitochondria is the “powerhouse” of the cell, which captures oxygen to make energy — its absence in the H. salminicola genome indicates that the parasite does not breathe oxygen.

  • NASA’s InSight Mission

     

    It’s now more than a year since NASA’s InSight lander mission touched down on Mars on November 26, 2018. This week, NASA published a report regarding findings on the Mars.

    About InSight Mission

    • The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport mission is a robotic lander designed to study the deep interior of the planet Mars.
    • It is the first mission dedicated to looking deep beneath the Martian surface.
    • Among its science tools are a seismometer for detecting quakes, sensors for gauging wind and air pressure, a magnetometer, and a heat flow probe designed to take the planet’s temperature.
    • The InSight mission is part of NASA’s Discovery Program.
    • It is being supported by a number of European partners, which include France’s Centre National d’Études Spatiales (CNES), the German Aerospace Center (DLR) and the United Kingdom Space Agency (UKSA).

    Key findings of the Mission

    Underground: rumbles

    • Mars trembles more often than expected, but also more mildly.
    • This emerged from readings of the ultra-sensitive seismometer, called the Seismic Experiment for Interior Structure (SEIS).
    • The instrument enables scientists to “hear” multiple trembling events from hundreds to thousands of miles away.
    • Mars doesn’t have tectonic plates like Earth, but it does have volcanically active regions that can cause rumbles.

    The surface: Magnetism

    • Billions of years ago, Mars had a magnetic field.
    • Although it is no longer present, it left behind what NASA describes as “ghosts” – magnetized rocks that are now between 61 m to several km below ground.
    • InSight is equipped with a magnetometer, which has detected magnetic signals.
    • At a Martian site called Homestead hollow, the magnetic signals are 10 times stronger than what was predicted earlier (based on data from orbiting spacecraft).

    In the wind: dust devils

    • InSight measures wind speed, direction and air pressure nearly continuously.
    • Weather sensors have detected thousands of passing whirlwinds, which are called dust devils when they pick up grit and become visible.
    • The site has more whirlwinds than any other place where a landing has been made on Mars while carrying weather sensors.
    • Despite all that activity in the wind and frequent imaging, InSight’s cameras have yet to see dust devils. But SEIS can feel these whirlwinds pulling on the surface.

    The core: still to come

    • InSight has two radios. One is for regularly sending and receiving data. The other radio, which is more powerful, is designed to measure the “wobble” of Mars as it spins.
    • This X-band radio, also known as the Rotation and Interior Structure Experiment (RISE), can eventually reveal whether the planet’s core is solid or liquid.
    • A solid core would cause Mars to wobble less than a liquid one would.
    • This first year of data is just a start, NASA said in the statement. When it is two years on Earth, Mars will have completed one year.

  • [pib] ICoSDiTAUS-2020

    ICoSDiTAUS-2020 a two-day International Conference on Standardisation of Diagnosis and Terminologies in Ayurveda, Unani and Siddha systems of Medicine was concluded in New Delhi.

    ICoSDiTAUS-2020

    • The conference was jointly organized by the Ministry of AYUSH and the WHO at New Delhi
    • It adopted the “New Delhi Declaration on Collection and Classification of Traditional Medicine (TM) Diagnostic Data”.
    • The New Delhi declaration emphasised the commitment of the countries to Traditional Medicine (TM) as a significant area of health care.
    • It further sought the opportunity for including traditional systems of medicine like Ayurveda, Unani and Siddha in the International Classification of Diseases (ICD) of WHO which is the standard diagnostic tool for health management across the world.

  • Taj Mahal Complex

    The Taj Mahal complex has been spruced up for the visit of US President Donald Trump and First Lady Melania Trump.

    About Taj

    • The Taj Mahal is an ivory-white marble mausoleum on the south bank of the Yamuna river in the city of Agra.
    • It was commissioned in 1632 by Shah Jahan (reigned from 1628 to 1658) to house the tomb of his favourite wife, Mumtaz Mahal; it also houses the tomb of Shah Jahan himself.
    • The tomb is the centrepiece of a 17-hectare (42-acre) complex, which includes a mosque and a guest house, and is set in formal gardens bounded on three sides by a crenellated wall.
    • The Taj Mahal complex is believed to have been completed in its entirety in 1653 at a cost estimated at the time to be around 32 million rupees, which in 2015 would be approximately 52.8 billion rupees (U.S. $827 million).
    • The construction project employed some 20,000 artisans under the guidance of a board of architects led by the court architect to the emperor, Ustad Ahmad Lahauri.
    • The Taj Mahal was designated as a UNESCO World Heritage Site in 1983 for being “the jewel of Muslim art in India and one of the universally admired masterpieces of the world’s heritage”.

    Various threats to Taj

    • The Supreme Court had earlier expressed concern over the marble of the Taj changing colour, and asked how the white marble, which had first become yellowish, was now turning brownish and greenish.
    • Firstly, the polluting industries and the vehicular emissions in the Taj Trapezium Zone (TTZ) area are a major source of pollution.
    • The second reason is that the Yamuna River, which flows behind the Taj, has become highly polluted.
    • There is no aquatic life in it, and has caused insect and algae infestation on the Taj Mahal and other monuments situated on its banks.

    Use of mud packs

    • Increasing pollution in the air over the Gangetic Valley affecting the Taj has been a reason for concern for archaeologists and conservationists for long now.
    • Mud packs were applied on the surface of the monument first in 1994, and then again in 2001, 2008, and, most recently, beginning 2014.
    • Mud packs have been one of the ASI’s favoured ways to remove the yellow stains that have appeared over the years on the Taj Mahal’s white marble facade.
    • The clay is applied in the form of a thick paste that absorbs the grime, grease and bird droppings on the marble, before being washed off using distilled water.
    • The process is slow and tortuous, but is believed to leave the marble cleaner and shinier.
    • The intricate parts are applied with special “multani mitti’ (Fuller’s clay) treatment.

  • Habitable-zone Planet Finder (HPF)

     

    At 100 light-years from Earth, a low-mass star was sending signals in a pattern that suggested that an exoplanet was orbiting the star confirmed the Habitable-zone Planet Finder (HPF).

    Habitable-zone Planet Finder

    • NASA’s Kepler mission observed a dip in the host star’s light, suggesting that the planet was crossing in front of the star during its orbit.
    • To confirm, researchers turned to an instrument called Habitable-zone Planet Finder (HPF). It has confirmed that there is indeed an exoplanet.
    • HPF is an astronomical spectrograph, built by Penn State University scientists, and recently installed on the 10m Hobby-Eberly Telescope at McDonald Observatory in Texas.
    • The instrument is designed to detect and characterize planets in the habitable zone — the region around the star where a planet could sustain liquid water on its surface — around nearby low-mass stars.
    • The newly confirmed planet, called G 9-40b, is the first one validated by HPF. It is about twice the size of Earth and orbits its star once every six Earth-days.

    How it works

    • A spectrograph is an instrument that splits light into its component wavelengths.
    • Scientists then measure the properties of light over a specific portion of the spectrum and draw conclusions on what is responsible for the trends they observe.

    Why need HPF?

    • Kepler’s observations alone were not enough to confirm a planet. It was possible that a close stellar companion was responsible for the dip in the star’s light.
    • Precision spectroscopic observations from HPF ruled out this possibility.
    • Shooting a high-power laser into the air, researchers generated a “laser guide star”, and subsequent observations found no evidence of blending of light or other stellar companions.
    • Finally, using HPF, an analysis of a set of radial velocities helped provide estimates for the planet’s mass.

  • Spontaneous Regression

    Patients sometimes make ‘miraculous’ recoveries from severe ailments. This is called spontaneous healing or spontaneous regression.

    Spontaneous healing/regression

    • A patient improves unexpectedly from a disease that usually progresses, such as cancer, and at times is even cured.
    • Such cases notwithstanding, the medical fraternity is often sceptical and takes “miraculous” recoveries as flukes.
    • A research explores patterns behind healing illnesses such as the deadliest kinds of cancers, and lays out physical and mental principles associated with recovery.
    • These include physically healing diets and immune systems, and mentally healing stress responses and identities.

    How does it occur?

    • The research states that much of our physical reality is created in our minds and perception changes our experiences, sometimes to the point of changing our bodies.
    • Therefore it argues that healing our identities may be a key tool to recovery.