đŸ’„Join UPSC 2027,2028 Mentorship (July Batch) + XFactor Notes & Microthemes PDF
Talk to Mentor

Civilsdaily

Login

Subject: Science and Technology

  • Explaining Lithium increase in the Universe

    In a study recently published in Nature Astronomy scientists from Indian Institute of Astrophysics (IIA) along with their international collaborators have provided a robust observational evidence for the first time that Li production is common among low mass Sun-like stars during their He-core burning phase.

    Importance of lithium in our life

    • Light inflammable, metal lithium (Li) has brought about transformation in modern communication devices and transportation.
    • A great deal of today’s technology is powered by lithium in its various shades [remember Li-ion battery!].
    • But where does the element come from?
    • The origin of much of the Li can be traced to a single event, the Big-Bang that happened about 13.7 Billion years ago, from which the present-day Universe was also born.

    Why lithium was thought to be different?

    • Li content in the physical Universe has increased by about a factor of four over the life of the Universe.
    • However, the rest of the elements carbon, nitrogen, oxygen, iron, nickel and so on which grew about a million times over the lifetime of the Universe.
    • Li, however, understood to be an exemption!
    • Current understanding is that lithium in stars like our Sun only gets destroyed over their lifetime.
    • As a matter of fact, the composition of all the elements in the Sun and the Earth is similar.
    • But, the measured content of Li in the Sun is a factor of 100 lower than that of the Earth, though both are known to have formed together.

    So, what the new finding suggests?

    • This discovery challenges the long-held idea that stars only destroy lithium during their lifetime.
    • It implies that the Sun itself will manufacture lithium in the future.
    • This is not predicted by models, indicating that there is some physical process missing in stellar theory.
    • Further, the authors identified “He flash”.
    • “He flash” is an on-set of He-ignition at the star’s core via violent eruption at the end of the star’s core hydrogen-burning phase, as the source of Li production.
    • Our Sun will reach this phase in about 6-7 billion years.

  • Remembering P C Mahalanobis

    Prasanta Chandra Mahalanobis, India’s ‘Plan Man’ and the architect of the country’s statistical system is more relevant now in times of Covid pandemic when we grapple with the lack of data.

    Analysing 1944 Bengal famine

    • He conducted a large-scale sample survey of Bengal’s famine between July 1944 and February 1945.
    • Sample survey helped in causal analysis and to assess the extent of the disaster and an estimate of the number of people affected.

    Relevance today

    • Bengal’s famine survey reminds us that we need estimates of the millions who will lose jobs or livelihoods in today’s pandemic.
    • The extent of feasibility, success and problem of online access also needs to be properly estimated in this new dawn.
    • Mahalanobis is perhaps more relevant today when the accuracy of different sorts of data is under the scanner.
    • Mahalanobis envisaged large-scale sample surveys as statistical engineering rather than pure theory of sampling.
    • He was instrumental in establishing the National Sample Survey (NSS) in 1950 and the Central Statistical Organization in 1951.

    Data accuracy

    • Mahalanobis was very careful about data accuracy in his surveys.
    • In Kautilya’s Arthashastra, there is mention of the need for cross-checking by an independent set of agents for data collection.
    • This, according to Mahalanobis, was the “striking feature in the Arthashastra”.
    • This might have prompted him to have an independent supervisory staff during the conduct of field operations by the NSS.
    • His initial training in Physics might have made him conscious about errors in measurement and observation.
    • The desire to have built-in cross-checks and to get an estimate of errors in sampling led him to introduce the Inter-Penetrating Network of Subsamples.
    • The network is considered as the curtain-raiser for re-sampling procedures like Bootstrap.
    • Bootstrap is a revolutionary concept of statistics.

    Difficulties in conducting surveys

    • Even Mahalanobis could have faced hardship had he wished to conduct surveys now.
    • First, even in pre-COVID-19 India, it’s widely reported that surveyors were facing tremendous resistance from people due to some sociopolitical reasons.
    • Pronab Sen, Chairman of the Standing Committee on Economic Statistics, and former Chief Statistician, expressed his concern that the survey system is already in “deep trouble”.
    • Conducting household surveys with the Census as the frame would be “very tough” going ahead.
    • The problem will intensify due to COVID-19.

    Use of technology for survey

    • Mahalanobis never shied away from technology.
    • He was instrumental in bringing computers to India.
    • The Mahalanobis-led Indian Statistical Institute procured India’s first computer in 1956 and the second in 1959.

    Consider the question asked in 2019 “How was India benefitted from the contributions of Sir M.Visvesvaraya and Dr M. S. Swaminathan in the fields of water engineering and agricultural science respectively?”

    Conclusion

    Mahalanobis wrote: “Statistics are a minor detail, but they do help.” This is an eternal truth. What Mahalanobis didn’t spell out is that one needs a top statistician for listening to the heartbeats of data and for framing data-based policy decisions for human welfare and national development.

  • What is Raman Spectroscopy?

    Mumbai-based researchers have turned to Raman Spectroscopy to detect RNA viruses present in saliva samples.

    Try this question from CSP 2017
    Q.Which Indian astrophysicist and Nobel laureate predicted rapidly rotating stars emit polarized light?
    (a) Subrahmanyan Chandrasekhar
    (b) CV Raman
    (c) Ramanujan
    (d) Amartya Sen

    The Raman Spectroscopy

    • Raman spectroscopy is an analytical technique where scattered light is used to measure the vibrational energy modes of a sample.
    • 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.

    How does it work?

    • 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.

  • What is Winter Diesel?

    India’s armed forces may soon be using winter diesel for operations in high altitude areas such as Ladakh, where winter temperatures plummet to extremely low as -30° Celsius.

    This year BS-VI compliant fuel was in news. Try differentiating the Winter Diesel with the BS-VI fuel.

    What is Winter Diesel?

    • Winter diesel is a specialised fuel that was introduced by Indian Oil Corp. Ltd. last year specifically for high altitude regions and low-temperature regions such as Ladakh, where ordinary diesel can become unusable.
    • The flow characteristics of regular diesel change at such low temperatures and using it may be detrimental to vehicles.
    • Winter diesel which contains additives to maintain lower viscosity can be used in temperatures as low as -30°C and that besides a low pour point, it had higher cetane rating — an indicator is the combustion speed of diesel and compression needed for ignition.
    • It has lower sulphur content, which would lead to lower deposits in engines and better performance.

    Back2Basics: BS-VI fuel

    • Sulphur content in fuel is a major cause for concern. Sulphur dioxide released by fuel burning is a major pollutant that affects health as well.
    • BS-VI fuel’s sulphur content is much lower than BS-IV fuel.
      It is reduced to 10 mg/kg max in BS-VI from 50 mg/kg under BS-IV.

    This reduction makes it possible to equip vehicles with better catalytic converters that capture pollutants. However, BS-VI fuel is expected to be costlier that BS-IV fuel.

    With inputs from:
    https://www.civilsdaily.com/news/pib-winter-grade-diesel/

  • Phobos: The closest and biggest moon of Mars

    The Mars Colour Camera (MCC) onboard ISRO’s Mars Orbiter Mission (MOM) has captured the image of Phobos, the closest and biggest moon of Mars.

    Try this question from CSP 2017:

    Q.Which region of Mars has a densely packed river deposit indicating this planet had water 3.5 billion years ago?

    (a) Aeolis Dorsa (b) Tharsis (c) Olympus Mons (d) Hellas

    About Phobos

    • Phobos is the innermost and larger of the two natural satellites of Mars, the other being Deimos.
    • Both moons were discovered in 1877 by American astronomer Asaph Hall.
    • Phobos is a small, irregularly shaped object with a mean radius of 11 km and is seven times as massive as the outer moon, Deimos.
    • Phobos is largely believed to be made up of carbonaceous chondrites.
    • The violent phase that Phobos has encountered is seen in the large section gouged out from a past collision (Stickney crater) and bouncing ejecta.

    Back2Basics: Mars Orbiter Mission (MOM)

    • The MOM also called Mangalyaan is a space probe orbiting Mars since 24 September 2014. It was launched on 5 November 2013 by the Indian Space Research Organisation (ISRO).
    • It aims at studying the Martian surface and mineral composition as well as scans its atmosphere for methane (an indicator of life on Mars).
    • It is India’s first interplanetary mission and it made it the fourth space agency to reach Mars, after Roscosmos, NASA, and the European Space Agency.
    • It made India the first Asian nation to reach Martian orbit and the first nation in the world to do so on its maiden attempt.
    • It was initially meant to last six months, but subsequently, ISRO had said it had enough fuel for it to last “many years.”

  • International Thermonuclear Experimental Reactor (ITER) Project

    The heavy engineering division of L&T dispatched a giant Cryostat lid, to International Thermonuclear Experimental Reactor (ITER) site in France from its Hazira unit in Gujarat.

    Try this MCQ:

    Q.With reference to International science projects, consider the following:

    1. Large Hadron Collider (LHC)– The God Particle
    2. Thirty Metre Telescope (TMT) – The World’s Most Advanced Telescope
    3. International-Thermonuclear-Experimental-Reactor (ITER) – Fusion Energy
    4. Facility for Antiproton and Ion Research (FAIR) – Antiproton and Ion Research

    Which of the above projects have India’s active participation?

    a) 1 only

    b) 2 and 3 only

    c) 1, 3 and 4 only

    d) All of them

    ITER Project

    • ITER is international nuclear fusion research and engineering megaproject, which will be the world’s largest magnetic confinement plasma physics experiment.
    • The goal of ITER is to demonstrate the scientific and technological feasibility of fusion energy for peaceful use.

    Minutes of the project

    • The project is funded and run by seven member entities—the European Union, India, Japan, China, Russia, South Korea and the United States.
    • The EU, as host party for the ITER complex, is contributing about 45 per cent of the cost, with the other six parties contributing approximately 9 per cent each.
    • Construction of the ITER Tokamak complex started in 2013 and the building costs were over US$14 billion by June 2015.

    How does it work?

    • ITER is the most complex science project in human history. The ITER aims to use a strong electric current to trap plasma inside a doughnut-shaped enclosure long enough for fusion to take place.
    • Hydrogen plasma will be heated to 150 million degrees Celsius, ten times hotter than the core of the Sun, to enable the fusion reaction.
    • The process happens in a doughnut-shaped reactor, called a tokamak 1, which is surrounded by giant magnets that confine and circulate the superheated, ionized plasma, away from the metal walls.
    • The superconducting magnets must be cooled to -269°C (-398°F), as cold as interstellar space.
    • Scientists have long sought to mimic the process of nuclear fusion that occurs inside the sun, arguing that it could provide an almost limitless source of cheap, safe and clean electricity.
    • Unlike in existing fission reactors, which split plutonium or uranium atoms, there’s no risk of an uncontrolled chain reaction with fusion and it doesn’t produce long-lived radioactive waste.

    Back2Basics: Nuclear Fusion

    • Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei. This process is called a nuclear reaction.
    • The nucleus made by fusion is heavier than either of the starting nuclei. It releases a large amount of energy.
    • Fusion is what powers the sun. Atoms of Tritium and Deuterium (isotopes of hydrogen, Hydrogen-3 and Hydrogen-2, respectively) unite under extreme pressure and temperature to produce a neutron and a helium isotope.
    • Along with this, an enormous amount of energy is released, which is several times the amount produced by fission.
    • Scientists continue to work on controlling nuclear fusion in an effort to make a fusion reactor to produce electricity.

    How it is different from nuclear fission?

    • Simply put, fission is the division of one atom into two (by neutron bombardment), and fusion is the combination of two lighter atoms into a larger one (at a very high temperature).
    • Nuclear fission takes place when a large, somewhat unstable isotope (atoms with the same number of protons but a different number of neutrons) is bombarded by high-speed particles, usually neutrons.

  • ‘Accelerate Vigyan’ Scheme

    To provide a single platform for research internships, capacity building programs and workshops across the country, the Science and Engineering Research Board (SERB) has launched a new scheme called ‘Accelerate Vigyan’ (AV).

    Note the following things about the ‘Accelerate Vigyan’ Scheme:

    1) Implementing agency/ Nodal Ministry

    2) Primary objective

    3) Target beneficiaries

    4) Its components

    ‘Accelerate Vigyan’ Scheme

    • Accelerate Vigyan (AV) strives to provide a big push to high-end scientific research and prepare scientific manpower which can venture into research careers and knowledge-based economy.
    • The primary objective of this scheme is to give more thrust on encouraging high-end scientific research and preparing scientific manpower, which can lead to research careers and knowledge-based economy.
    • AV will initiate and strengthen mechanisms of identifying research potential, mentoring, training and hands-on workshop on a national scale.
    • The aim is to expand the research base in the country, with three broad goals – consolidation / aggregation of all scientific training programs, initiating High-end Orientation Workshops and creating opportunities for Research Internships.

    Components of AV

    1) ABHYAAS

    • It is an attempt to boost research and development in the country by enabling and grooming potential PG/PhD students by means of developing their research skills in selected areas across different disciplines or fields.
    • It has two components: High-End Workshops (‘KARYASHALA’) and Research Internships (‘VRITIKA’).
    • This is especially important for those researchers who have limited opportunities to access such learning capacities/facilities/infrastructure.

    2) SAMOOHAN

    • Mission ‘SAMOOHAN’ marks the beginning of Accelerate Vigyan.
    • It aims to encourage, aggregate and consolidate all scientific interactions in the country under one common roof.
    • It has been sub-divided into ‘SAYONJIKA’ and ‘SANGOSHTI’.
    • SAYONJIKA is an open-ended program to catalogue the capacity building activities in science and technology supported by all government funding agencies in the country.
    • SANGOSHTI is a pre-existing program of SERB.

  • Festival in news: Bahuda Yatra

    The Bahuda Yatra, the return journey of the deities to the Puri Jagannath temple after the annual Rath Yatra, was recently concluded amid permitted restrictions.

    Bahuda Yatra

    • A/c to folk stories Lord Jagannath and his siblings, Goddess Shubhadra and Lord Balabhadra, returns from their aunt’s place at Gundicha Temple to Jagannath Temple.
    • This journey is known as Bahuda Yatra.
    • Nine days after the Rath Yatra, the yatra or the return journey takes place.

    About Jagannath Rath Yatra

    • Ratha Jatra, the Festival of Chariots of Lord Jagannatha is celebrated every year at Puri, the temple town in Orissa, on the east coast of India.
    • It involves a public procession with a chariot with deities Jagannath (Vishnu avatar), BalaBhadra (his brother), Subhadra (his sister) and Sudarshana Chakra (his weapon) on a ratha, a wooden deula-shaped chariot.
    • The huge, colourfully decorated chariots, are drawn by hundreds and thousands of devotees on the bada danda, the grand avenue to the Gundicha temple, some two miles away to the North.
    • It attracts over a million Hindu pilgrims who join the procession each year.

    Back2Basics: Puri Temple Architecture

    • Jagannath Temple is a very big temple and covers an area of 37000m2. The height of the outer wall is 6.1m.
    • It is surrounded by a high fortified wall 6.1 m high is known as Meghanada Pacheri.
    • The main portion of the temple is also surrounded by a wall known as Kurma Bheda.
    • The temple is built in Rekha Deula style and has four distinct sectional structures, namely –
    1. Deula, Vimana or Garba griha (Sanctum sanctorum) where the triad deities are lodged on the ratnavedi (Throne of Pearls)
    2. Mukhashala (Frontal porch)
    3. Nata mandir/Natamandapa, which is also known as the Jagamohan (Audience Hall/Dancing Hall), and
    4. Bhoga Mandapa (Offerings Hall)

    Try this question from CSP 2019:

    Q.Building ‘Kalyaana Mandapas’ was a notable feature in the temple construction in the kingdom of-

    (a) Chalukya (b) Chandela (c) Rashtrakuta (d) Vijayanagara

  • Gold Nanoparticles and their applications

    Indian researchers have successfully synthesized gold nanoparticles (GNPs) using psychrotolerant Antarctic bacteria through a non-toxic, low-cost, and eco-friendly way.

    Nanotechnology is a pathbreaking technology which can create many new materials and devices with a wide range of applications, such as in nanomedicine, nanoelectronics etc.   GNPs are another distinct development.

    What are Gold Nanoparticles?

    • Metallic NPs have been efficiently exploited for biomedical applications and among them, GNPs are found to be effective in biomedical research.
    • And NPs are those materials that are at least one dimension smaller than 100 nanometers.
    • NPs have a high surface-to-volume ratio and they can provide the tremendous driving force for diffusion, especially at elevated temperatures.
    • GNPs are melted at much lower temperatures (300 °C) than bulk gold (1064 °C).
    • NPs have been found to impart various desirable properties to different day-to-day products.
    • For example, GNPs are found to have greater solar radiation absorbing ability than the conventional bulk gold, which makes them a better candidate for use in the photovoltaic cell manufacturing industry.

    Properties of GNP

    1) Biomedical

    • Genotoxicity describes the property of a chemical agent that is capable of damaging the genetic information of DNA and thus causing the mutation of the cell, which can lead to cancer.
    • The study revealed the genotoxic effect of GNPs on a sulphate reducing bacteria (SRB).
    • These GNPs can be used as composite therapeutic agent clinical trials, especially in anti-cancer, anti-viral, anti-diabetic, and cholesterol-lowering drugs.

    2) Optical

    • GNPs have unique optical properties too. For example, particles above 100 nm show blue or violet colour in the water, while the colour becomes wine red in 100 nm gold colloidal particles.
    • They can thus be used for therapeutic imaging.

    3) Electronics

    • GNPs are also found to be useful in the electronics industry.
    • Scientists have constructed a transistor known as NOMFET (Nanoparticles Organic Memory Field-Effect Transistor) by embedding GNPs in a porous manganese oxide.
    • NOMFETs can mimic the feature of the human synapse known as plasticity or the variation of the speed and strength of the signal going from neuron to neuron.
    • These novel transistors can now facilitate better recreation of certain types of human cognitive processes, such as recognition and image processing and have their application in AI.

  • What is Gynandromorphism?

    Recently, a rare biological phenomenon called Gynandromorphism was observed in dragonflies at Kole wetlands of Kerala.

    Gynandromorphism is a core biology concept. We can expect a prelims question in a rare scenario.

    Try this question from CSP 2013:

    Q.Improper handling and storage of cereal grains and oilseeds result in the production of toxins known as aflatoxins which are not generally destroyed by normal cooking process. Aflatoxins are produced by

    (a) Bacteria (b) Protozoa (c) Moulds (d) Viruses

    Gynandromorphism

    • Gynandromorphs are individual animals that have both genetically male and female tissues and often have observable male and female characteristics.
    • They may be bilateral, appearing to divide down the middle into male and female sides, or they may be mosaic, with patches characteristic of one sex appearing in a body part characteristic of the other sex.
    • Gynandromorphs occur in insects, spiders, crustaceans, and other arthropods as well as in birds, but they are extremely rare, and discovering one in the field or in the laboratory is a major event.
    • Estimating how frequently they occur is difficult because they usually go unnoticed in species where sexual dimorphism is less pronounced.
    • Gynandromorphs have been reported in mosquitoes, fruit flies, and in other insects, but they are most dramatic in those butterfly species in which the male and female wing colours and patterns are dramatically different.