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Subject: Science and Technology

  • GW190412: The first merger of two black holes with unequal masses

    For the first time since it started functioning, the gravitational wave observatories at LIGO scientific collaboration have detected a merger of two unequal-mass black holes.

    This newscard contains few basic terms that one must know-

    Gravitational waves

    General Relativity

    Black Holes

    GW190412

    • The event, dubbed GW190412, was detected nearly a year ago, and this is almost five years after the first-ever detection of gravitational-wave signals by these powerful detectors.
    • Subsequent analysis of the signal coming from the violent merger showed that it involved two black holes of unequal masses coalescing.
    • One of them was some 30 times the mass of the Sun and the other which had a mass nearly 8 times the solar mass.
    • The actual merger took place at a distance of 2.5 billion light-years away.

    Significant feature observed

    • The detected signal’s waveform has special extra features in it when it corresponds to the merger of two unequal-sized black holes as compared with a merger of equal-sized black holes.
    • These features make it possible to infer many more things about the characters such as- a more accurate determination of the distance from the event, the spin or angular momentum of the more massive black hole and the orientation of the whole event with respect to viewers on Earth.
    • While the mass of the black hole bends the space-time close to it, the spin or angular momentum of this inscrutable object drags the nearby space-time, causing it to swirl around, along with it.
    • Hence both these properties are important to estimate.

    Confirmed General Relativity

    • An Indian team consisting of researchers verified the consistency of the signal with the prediction of General Relativity.
    • The existence of higher harmonics was itself a prediction of General Relativity.

    Must refer for an easy and illustrated understanding of General Relativity-

     

  • The Curie Family and its Nobel legacy

    This newscard is inspired by an article published in the DTE which talks about a family which has received a total of four Nobel prizes, the highest won by a single-family.

    Last year in 2019 CSP, there was a question on pure Biology about Hepatitis and its variants. With such news trending, we can expect a core chemistry or physics based question coupled with a slight Current Affairs blend.

    The ‘Nobel’ family

    • On April 20, 1902, Marie and Pierre Curie successfully isolated radioactive radium salts from pitchblende, a mineral, in a laboratory in Paris, France.
    • They were inspired by French physicist Henri Becquerel’s 1896 experiment on phosphorescence or the phenomenon that allows certain objects to glow in the dark.
    • They were able to find traces of two radioactive elements—polonium (Element 84) and radium (Element 88).
    • Curie shared the 1903 Nobel with her fellow researcher Pierre Currie and Becquerel for their combined work on radioactivity.

    Important facts

    • In 1903, Marie Curie received the Nobel Prize in Physics making her the world’s first woman to win the prize.
    • In 1911, she created history again by becoming the first woman to have won two Nobel awards.
    • The 1911 Nobel Prize in Chemistry was awarded to Marie after she managed to produce radium as a pure metal. This proved the new element’s existence beyond doubt.
    • However, this was not the last Nobel for the Curie family.
    • The 1935 Nobel in Chemistry went to Irène Curie and her husband and co-researcher Frédéric Joliot for their joint work on the artificial creation of new radioactive elements.
    • The Curies have received a total of four of Nobel prizes, the highest won by a single-family. They also have the unique distinction of having three Nobel-prize winning members in the family.

    Birth of Radioactivity

    • While delivering a lecture at the Royal Academy of Sciences in Stockholm, Sweden in 1911, Curie shared some critical details about “radioactive elements” and the phenomenon called “radioactivity”.
    • She also spoke about the chemical properties of radium, the new element that was about a million times more radioactive than uranium.
    • Radium in solid salts was about 5 million times more radioactive than an equal weight of uranium.

    Back2Basics: Radioactivity

    • Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.
    • It is the process by which an unstable atomic nucleus loses energy by radiation.
    • The most common types of radiation are called alpha, beta, and gamma radiation, but there are several other varieties of radioactive decay.
    • Radioactive decay rates are normally stated in terms of their half-lives, and the half-life of a given nuclear species is related to its radiation risk.
    • Examining the amounts of decay products makes possible radioactive dating.

    Its applications

    • Medical use: Many diseases such as cancer are cured by radiotherapy. Sterilization of medical instruments and food is another common application of radiation.
    • Scientific use: Alpha particles emitted from the radioisotopes are used for nuclear reactions.
    • Industrial use: Radioisotopes are used as fuel for atomic energy reactors. Also used in Carbon dating.

  • Unified Geologic Map of the Moon

    The first-ever digital, unified, global, geological map of the moon was released virtually by the  United States Geological Survey (USGS), NASA and the Lunar Planetary Institute.

    Unified Geologic Map of the Moon

    • The UGM will serve as a blueprint for future human missions and a source of research and analysis for the educators and the general public interested in lunar geology.
    • The map is a ‘seamless, globally consistent, 1:5,000,000-scale geologic map’.
    • The mapped surface features of the moon included crater rim crests, buried crater rim crests, fissures, grabens, scarps, mare wrinkle ridges, faults, troughs, rilles, and lineaments.

    How it was prepared?

    • The researchers built on the original digital renovation of the six maps comprising of the near, central far, east, west, north and south sides that was released in 2013.
    • The final map consists of 43 geologic units across the entire lunar surface, broken down into groups based on characteristics like materials of craters, basins, terra, plains and volcanic units.
    • Data from NASA’s Apollo Missions were used to come up with the map.

    Its’ significance

    • The moon’s South Pole is especially interesting because the area is much larger than the North Pole and there could be a possibility of the presence of water in these permanently shadowed areas.
    • Further, the South Pole region also contains the fossil record of the early Solar System.
    • These present and future moon missions’ success can be further helped by the digital map of the moon.
    • The Chandrayaan 2, an active mission also targets the Lunar South Pole for exploration.

  • Reverse Vaccinology and its benefits

    The Tamil Nadu Dr. MGR Medical University has developed a vaccine candidate against SARS-CoV-2 through ‘reverse vaccinology’.

    A definition based prelims question can be expected on Reverse Vaccinology. Ex. Which of the following statements best describes ‘Reverse Vaccinology’?

    Reverse Vaccinology

    • Reverse vaccinology is an improvement on vaccinology that employs applied bioinformatics.
    • The basic idea behind it is that an entire pathogenic genome can be screened using bioinformatics approaches to find genes.
    • Some traits that the genes are monitored for may indicate antigenicity.
    • Those genes are filtered for desirable attributes that would make good vaccine targets such as outer membrane proteins.
    • Once the candidates are identified, they are produced synthetically and are screened in animal models of the infection.
    • Since then, it has been used on several other bacterial vaccines.

    Benefits

    • Earlier researchers had to do a viral culture in the laboratory to develop a vaccine, and this was time-consuming.
    • The major advantage for reverse vaccinology is finding vaccine targets quickly and efficiently.
    • Traditional methods took decades to unravel pathogens and antigens, diseases and immunity
    • With ‘reverse vaccinology’ scientists know what molecules make the genomic sequence.

  • Mobile Virology Research and Diagnostics Laboratory (MVRDL)

    The Defence Research and Development Organisation (DRDO) has developed a mobile virology research lab.

    We can expect a  prelim question on BSL ratings as the term is widely appearing in news these days.

    About the MVRDL

    • The MVRDL is the combination of a bio-safety level (BSL)-3 lab and a BSL-2 lab and was set up in a record time of 15 days.
    • It can process 1,000-2,000 samples a day.
    • The mobile lab will be helpful in carrying out a diagnosis of COVID-19 and in virus-culturing for drug screening, convalescent plasma-derived therapy, comprehensive immune profiling of patients towards vaccine etc.

    What are Biosafety Level (BSL) Ratings?

    • A BSL is a set of biocontainment precautions required to isolate dangerous biological agents in an enclosed laboratory facility.
    • The levels of containment range from the lowest biosafety level 1 (BSL-1) to the highest at level 4 (BSL-4).
    • BSL-1 is suitable for work with well-characterized agents which do not cause disease in healthy humans.
    • BSL- 2 is suitable for work involving agents of the moderate potential hazard to personnel and the environment.
    • BSL-3 is appropriate for work involving microbes which can cause serious and potentially lethal disease via the inhalation route.
    • BSL-4 is the highest level of biosafety precautions and is appropriate for work with agents that could easily be aerosol-transmitted within the laboratory and cause severe to fatal disease in humans for which there are no available vaccines or treatments.

  • [pib] Super-luminous Supernova SN 2010kd

    Indian researchers have found that SN 2010kd, a super-luminous supernova stands out with the amount of mass as well as Nickel ejected during explosion.

    Space science-related terms these days are often focused on Gravitational waves, Black holes etc. But basic terminologies are very important and need to be taken care of. For example, a layman may hardly find any difference between Novae-Supernovae, Neutron star, Nebula etc. UPSC often tries to bust you with such basic differences.

    What are Supernovae?

    • Supernovae are kind of energetic explosions were the core of massive stars (a few times to that of the mass of our Sun) goes to a catastrophic phase of explosion liberating huge amounts of energy and mass.
    • These events are visible through very far away distances much beyond our own solar system.
    • Super-luminous supernovae are a special type of stellar explosions having energy output 10 or more times higher than that of standard supernovae.

    What is so distinct about SN 2010kd?

    • The mass ejection from SN 2010kd is metallic and is much more than seen in case of normal core-collapse supernovae.
    • The scientists found that SN 2010kd exploded with a larger velocity but decayed slower than other similar supernovae.
    • The observations show that parameters like rotation and metallicity play a crucial role in stellar explosions.

  • [pib] ‘NanoBlitz 3D’ tool to map properties of nano-materials

    Indian scientists have developed an advanced tool for mapping nano-mechanical properties of materials like multi-phase alloys, composites, and multi-layered coatings.

    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.  NanoBlitz 3D is another distinct development. We can expect a prelims question asking what the NanoBlitz 3D is , with confusing options like 3d printing tool etc.

     NanoBlitz 3D

    • Scientists from Advanced Research Centre for Powder Metallurgy and New Materials (ARCI) an autonomous institute under the Dept. of S&T have developed this tool.
    • It is an advanced tool for mapping nano-mechanical properties of materials like multi-phase alloys, composites, and multi-layered coatings.
    • The tool has been useful to yield excellent results on a wide range of material systems, including glass-fibre-reinforced polymer composites, dual-phase steels, softwood and shale.
    • An important aspect of this technique is its high-throughput, with just a few hours of testing required for generating more than 10,000 data points that can be processed using machine learning (ML) algorithms.

  • Festivals in news: Ambubachi Mela

    The Ambubachi Mela at Guwahati’s Kamakhya Temple has been cancelled this year due to COVID-19.

    Many festivals this year have been cancelled for the first time in their recorded history. Few of them were – Thrisur Pooram Festival, Pandharpur Jatara and now, the Ambubachi Mela. Do read about the Medaram Jatara (held in February) as well. Take note of each of them and their speciality along with the respective state of celebration.

    Ambubachi Mela

    • Ambubachi Mela, a four-day fair to mark the annual menstruation of the goddess at Kamakhya temple in Guwahati has begun.
    • Legends say the temple atop the Nilachal Hills, whose northern face slopes down to the Brahmaputra River, was built by the demon king Narakasura.
    • But records are available only from 1565 when Koch king Naranarayana had the temple rebuilt.
    • Kamakhya is one of 51 shaktipeeths or holy sites for the followers of the Shakti cult, each representing a body part of the Sati, Lord Shiva’s companion.
    • The temple’s sanctum sanctorum houses the yoni – female genital – symbolised by a rock.

    Significance

    • Temple priests said the ritualistic fair celebrating the Goddess’ period is one of the reasons why taboo associated with menstruation is less in Assam compared to other parts of India.
    • The attainment of womanhood of girls in Assam is celebrated with a ritual called Tuloni Biya, meaning small wedding.

    Similar place

    • A similar custom is followed at the Devi Temple at Chengannur town in Alleppey district of Kerala.
    • The temple is shut for the days the Goddess there is believed to undergo her period.

  • Festival in news: Thrissur Pooram

    For the first time since its inception, Thrissur Pooram, considered as mother of all poorams in Kerala, has been cancelled earlier this month.

    Note the cultural terms in the newscard. As the name itself suggests the state of celebration, it very unlikely to be asked in the ‘fest-state’ format.  Rather UPSC can ask – “The  terms X, Y, Z …. are associated with which of the following reknown festival?”

    Thrissur Pooram

    • Thrissur Pooram is an annual Hindu festival held in Kerala.
    • It is held at the Vadakkunnathan Temple in Thrissur every year on the Pooram day – the day when the moon rises with the Pooram star in the Malayalam Calendar month of Medam.
    • It is the largest and most famous of all poorams.
    • Thrissur Pooram was the brainchild of Raja Rama Varma, famously known as Sakthan Thampuran, the Maharaja of Cochin (1790–1805).

    Actual course of the festival

    • The Pooram is centred on the Vadakkunnathan Temple, with all these temples sending their processions to pay obeisance to the Shiva, the presiding deity.
    • The Pooram officially begins with a flag hoisting ceremony (Kodiyettam).
    • All the participating temples of Thrissur Pooram are present for the ceremony, and there is a light firework to announce the commencement of the festival.
    • The seventh day of the pooram is the last day. It is also known as “Pakal Pooram”.

  • [pib] Ionospheric Electron Density (IED) and its applications

    Researchers from the Indian Institute of Geomagnetism (IIG), Mumbai, have developed a global model to predict the ionospheric electron density with larger data coverage—a crucial need for communication and navigation.

    We can gauge these days that PIB is coming with ample news which is visibly important and are focused on basic GS concept. Ionospheric Electron Density is one such concept. Its significance for prelims cannot be denied.

    Ionospheric Electron Density (IED)

    • The ionosphere exists between about 90 and 1000 km above the earth’s surface.
    • Radiation from the sun ionizes atoms and molecules here, liberating electrons from molecules and creating a space of free electron and ions.

    Studying IED

    • The ionospheric variability is greatly influenced by both solar originated processes and the neutral atmosphere origin.
    • Scientists have tried to model the ionosphere using theoretical and empirical techniques; however, the accurate prediction of electron density is still a challenging task.
    • In recent years, Artificial Neural Networks (ANNs) are showing potential to handle more complex and non-linear problems.

    What are Artificial Neural Networks (ANNs)?

    • ANNs are computing systems vaguely inspired by the biological neural networks that constitute animal brains.
    • Such systems “learn” to perform tasks by considering examples, generally without being programmed with task-specific rules.
    • For example, in image recognition, they might learn to identify images that contain cats by analyzing example images that have been manually labeled as “cat” or “no cat” and using the results to identify cats in other images.
    • They do this without any prior knowledge of cats, for example, that they have fur, tails, whiskers and cat-like faces.
    • Instead, they automatically generate identifying characteristics from the examples that they process.

    Significance of IED

    • Due to the ability of ionized atmospheric gases to refract high frequency (HF, or shortwave) radio waves, the ionosphere can reflect radio waves directed into the sky back toward the Earth.
    • Radio waves directed at an angle into the sky can return to Earth beyond the horizon.
    • This technique, called “skip” or “skywave” propagation, has been used since the 1920s to communicate at international or intercontinental distances.