Why in the News?

The Union Ministry of Science and Technology has inaugurated the centenary celebrations of Bose-Einstein Statistics at the S.N. Bose National Centre for Basic Sciences.

Bose-Einstein Condensate (BEC)

• A BEC is a special state of matter formed when bosons are cooled down to almost absolute zero (-273°C). In this state, the particles behave as one single quantum entity.
• Bosons, when cooled to near absolute zero, lose their individual properties and combine to form a single quantum state.
• It was achieved in 1995 by Eric Cornell and Carl Wieman using rubidium atoms.
• This discovery earned them the Nobel Prize in Physics.
• BECs exhibit unique quantum behaviors like zero viscosity (flow without friction) and act as a “super atom” that is extremely sensitive to any outside influence.

Significance of Bose-Einstein Statistics

• Bose-Einstein statistics are essential for understanding quantum mechanics, particularly the behavior of particles in quantum states.
• These statistics led to the discovery of Bose-Einstein Condensates, which have unique properties not seen in normal states of matter.
• BECs are useful in atomic clocks, superconductors, and quantum computing due to their sensitivity and unique quantum properties.
• Bose’s work was crucial in explaining light’s particle nature (photons), which helped develop the concept of wave-particle duality in quantum theory.
• Bose-Einstein statistics paved the way for studying low-temperature physics, allowing scientists to observe quantum effects in larger systems.
• These statistics and the discovery of BECs continue to inspire new fields of research, including quantum fluids and quantum phase transitions.

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Why in the News?

Scientists at Purdue University have figured out how to levitate and spin Fluorescent Nanodiamonds (FNDs) in a vacuum.

What are their Applications?

• Medical Diagnostics: FNDs are used for high-resolution imaging and tracking cells over extended periods due to their non-toxic nature.
• Temperature Sensing: FNDs can measure temperatures at the microscale, making them useful for scientific experiments.
• Correlative Microscopy: Their fluorescent properties make them ideal for combining different types of imaging techniques.
• Sensor Technologies: Due to their sensitivity to acceleration and electric fields, FNDs can be used in industry sensors and gyroscopes for rotation sensing.
• Quantum Computing: FNDs doped with nitrogen can be used for quantum superposition experiments and future quantum computing applications.

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Why in the News?

The LUX-ZEPLIN (LZ) experiment revealed that as we continue to push the boundaries of dark matter detection, the issue of neutrino fog becomes increasingly significant.

What is Neutrino Fog?

• Neutrinos, often referred to as “ghost particles,” are subatomic particles with nearly zero mass and no electric charge. 
• “Neutrino Fog” refers to the interference caused by neutrinos—subatomic particles that rarely interact with matter—in dark matter detection experiments.
• Neutrinos are produced naturally in the Sun’s core, supernovae, and even Earth’s atmosphere.
• Though they pass through most matter undetected, their weak interactions can cause small disturbances in highly sensitive detectors.
• As dark matter detectors become larger and more sensitive, they are more likely to detect neutrinos, leading to a “fog” of signals that can obscure or mimic potential dark matter interactions.

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Why in the News

Researchers at the Institute of Nano Science and Technology (INST) Mohali, have developed novel electrochemical and optical sensors using a new group of nano polymer materials.

About the Novel Nanopolymer:

Novel nanopolymers are innovative polymer materials that incorporate nanostructures or nanoparticles to impart unique properties.

• They are prepared using various methods like vapor condensation, vacuum evaporation, electrospinning, and chemical synthesis to create nanofibers, core-shell structures, hollow fibers, and tubes with diameters down to a few nanometers.
• Examples: Silicon nanospheres that are much harder than regular silicon, with hardness between sapphire and diamond, and bio-based N-heterocyclic poly(aryl ether ketone) with high biomass content and superior properties
• Applications of Novel Nanopolymers:
  • Biosensors and optoelectronics utilizing the fluorescence and magnetic properties of nanoparticles.
  • Drug delivery, tissue engineering, and gene therapy using biodegradable nanoparticle systems.
  • Forensics for drug detection, fingerprinting, DNA analysis, and sensors.
  • High-temperature-resistant plastics with improved properties.

These are the Novel Nanopolymers developed by INST:

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Why in the News?

Recent studies have provided deeper insights into the mechanics of Sonoluminescence, particularly the conditions under which light is emitted from collapsing bubbles in liquids.

Mystery behind Sonoluminescence

• Although the general mechanism is understood, the exact details of how the light is produced remain a mystery. 
• Scientists are still exploring the precise processes that cause the gases inside the bubble to ionize and emit light at such high temperatures.

Examples of Sonoluminescence

• Controlled Experiments: In laboratory settings, scientists create sonoluminescence by trapping a bubble in a liquid and subjecting it to high-frequency sound waves.
• Pistol Shrimp: When the shrimp (marine creature with a specialized claw) snaps its claw shut, it shoots out a jet of water that moves so fast it creates a low-pressure bubble. The bubble then collapses, producing a loud sound, intense heat, and sometimes a brief flash of light.

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Why in the News?

Researchers at Government College for Women, Thiruvananthapuram, have developed a way to make activated carbon from coconut husks, which are a common leftover from farming in Kerala. This activated carbon is well-suited for making supercapacitors.

What is Activated Carbon?

• Activated Carbon, also known as activated charcoal, is a highly porous form of carbon.
• It is processed to have small, low-volume pores with increased surface area available for adsorption or chemical reactions.
• It is widely used for purification, decontamination, and as a filtration medium.
• Key Characteristics:
  • High Surface Area: Due to its extensive network of pores, activated carbon has a very high surface area, typically ranging from 500 to 1500 m²/g.
  • Porosity: The structure includes micropores, mesopores, and macropores, allowing it to adsorb a variety of molecules.

How is it produced?

• Activated carbon is produced from carbonaceous source materials such as coconut shells, peat, wood, coir, lignite, coal, and petroleum pitch.
• The production involves two main steps:

1. Carbonization: The raw material is subjected to high temperatures (600-900°C) in an inert atmosphere (usually nitrogen or argon) to remove volatile components.
2. Activation/Oxidation: The carbonized material is treated with oxidizing agents (such as steam or carbon dioxide) at high temperatures (800-1000°C) to develop a porous structure.

Types:

• Powdered Activated Carbon (PAC): Finely ground carbon particles primarily used in liquid phase applications.
• Granular Activated Carbon (GAC): Larger particles used in both liquid and gas phase applications, such as water and air filtration.
• Extruded Activated Carbon (EAC): Cylindrical pellets used mainly for gas phase applications due to their low pressure drop and high mechanical strength.
• Impregnated Activated Carbon: Activated carbon treated with chemicals to enhance its adsorption capacity for specific contaminants.

Applications:

• Water Treatment: Removes contaminants like chlorine, odors, and organic compounds from drinking water.
• Air Purification: Adsorbs volatile organic compounds (VOCs), odors, and airborne pollutants.
• Medical Uses: Used in poisoning cases to absorb toxins in the gastrointestinal tract.
• Industrial Processes: Utilized in the recovery of solvents, purification of gases, and in gold purification.
• Food and Beverage: Helps in decolorization and purification processes in sugar, wine, and juice production.

About Coconut Husk-Derived Activated Carbon

• Coconut husk-derived activated carbon is a sustainable and efficient green solution for high-performance supercapacitors.
• This material is readily available, low-cost, and eco-friendly.
• It was produced by Microwave-Assisted Method designed at the Centralised Common Instrumentation Facility (CCIF) at the college.

Importance of Supercapacitors

• Energy Storage: Supercapacitors have significantly higher capacitance and energy storage capacity compared to conventional capacitors.
• Search for Ideal Material: Finding the ideal supercapacitor electrode material has been a significant challenge in sustainable energy storage solutions.

Research Findings:

• Efficiency: Prototype supercapacitors made from coconut husk-derived activated carbon are four times more efficient than existing supercapacitors.
• Cost-Effective and Efficient: Activated carbon produced using this technology is inexpensive and exhibits exceptional supercapacitor capability.

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Why in the News?

Understanding the absorbency of diapers through the Quantum physics of water absorption and contrasting materials that do or do not absorb water.

Absorption in Diapers: How it works?

• Absorption depends on Microscopic forces and Material properties. Water molecules are attracted to materials like cotton due to their structure.
• Cotton, a network of polymers with ions, absorbs water effectively by attracting water molecules.
• For large fluid absorption like in diapers, Super-Absorbent Polymers (SAP) are crucial.

What are Super-Absorbent Polymers (SAP)?

• SAPs are synthetic materials with the ability to absorb and retain large amounts of liquid relative to their own mass.
• They are commonly used in products like diapers, sanitary napkins, and other absorbent hygiene products.
• SAPs are typically cross-linked polymers, meaning their molecules are bonded in a way that creates a network capable of absorbing water molecules.

Examples:

1. Sodium Polyacrylate: This is one of the most common types of SAP used in diapers. It forms a gel-like substance when it absorbs liquid.
2. Polyacrylamide: Another type of SAP used in various applications, including agriculture and wastewater treatment, due to its high water-absorbing capacity.

Quantum Physics Insight of SAP

Quantum physics plays a fundamental role in understanding the behaviour of super-absorbent polymers (SAPs), particularly in how they interact with water molecules at the atomic level:

1. Electron Sharing: SAPs contain ions like sodium, which have a strong affinity for water molecules. This attraction is based on the principles of quantum physics, where atoms like sodium and oxygen prefer to share electrons to achieve stability. This shared electron arrangement allows water molecules to bond with the ions in SAPs, facilitating the absorption process.
2. Quantum Mechanical Properties: At the quantum level, electrons behave as waves and can exist in shared states between atoms. This phenomenon allows for the formation of stable bonds between water molecules and SAP ions, enhancing the SAP’s ability to absorb large amounts of liquid.
3. Energy States: Quantum physics explains how SAPs manage energy states during absorption. As water enters the SAP, energy is released due to changes in the electron configurations and bonding energies of the ions involved. This process is crucial for maintaining the gel-like structure of the SAP and preventing leakage.

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Why in the News?

Recently Scientists have designed a magnetic resonance imaging (MRI) scanner that costs a fraction of existing machines, setting the stage for improving access to this widely used diagnostic tool. So we need to know about the Electromagnet.

What is an Electromagnet?

• Invented in 1824 by William Sturgeon, electromagnets revolutionised technology.
• Sturgeon was an English physicist and inventor who discovered that wrapping a coil of wire around a piece of iron and passing an electric current through the wire produced a magnetic field.
• Electromagnets are used in Loudspeakers for sound reproduction, Motors for mechanical movement., and MRI machines for medical imaging, etc

How Electromagnets Work?

• Electric current flowing through a wire generates a magnetic field around the wire.
• Coiling the wire enhances this magnetic field by concentrating it within the coil’s core.
• This configuration creates an electromagnet, where the strength of the magnetic field is directly proportional to the current flowing through the coil.
• The magnetic flux density so generated is measured in ‘Tesla’.

Enhancing Magnetic Strength with a Core

• Coiling the wire around a magnetic material (core), such as iron or steel:
  • Amplifies the magnetic field produced by the electric current.
  • Ferromagnetic materials like iron align their internal magnetic domains with the external magnetic field generated by the coil.
  • This alignment significantly increases the overall magnetic strength of the electromagnet compared to a non-magnetic core.

Persistence of Magnetization

• It refers to the property of a material to retain a certain amount of magnetization even after the removal of an external magnetic field.
• Certain core materials exhibit retained magnetization even after the current ceases.
• This residual magnetism is useful in applications requiring sustained magnetic fields, such as:
  • Superconducting electromagnets used in MRI machines, are capable of producing magnetic fields up to 30 Tesla.
  • Research electromagnets like those used in particle physics, which require stable and powerful magnetic fields.

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Why in the news?

• South Korean scientists at the Korea Institute of Fusion Energy (KFE) achieved a significant milestone by producing temperatures of 100 million Celsius for 48 seconds in the Korea Superconducting Tokamak Advanced Research (KSTAR) fusion reactor.
• KSTAR maintained the high confinement mode (H-mode) for over 100 seconds, demonstrating stability in plasma conditions crucial for sustained fusion reactions.
• This is a world record.

What is Nuclear Fusion?

• Nuclear fusion involves fusion of hydrogen and other light elements to release massive energy, akin to the process that powers the Sun and stars.
• It is a process where two light atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process.
• This occurs under extremely high temperatures, typically in the range of tens of millions of degrees Celsius, and pressure, similar to those found in the core of stars.
• In a tokamak reactor, hydrogen variants are heated to extreme temperatures to create a plasma, mimicking conditions found in the Sun’s core.
• 1 kg of fusion fuel contains about 10 million times as much energy as a kg of coal, oil or gas.

Significance of KSTAR’s achievements

• Achieving sustained fusion reactions in laboratory conditions unlocks the potential for unlimited, zero-carbon electricity generation.
• By extending the duration of high-temperature fusion, scientists aim to sustain plasma temperatures of 100 million degrees for 300 seconds by 2026, pushing the boundaries of fusion research.
• Progress in fusion research at KSTAR contributes to international efforts, supporting projects like the International Thermonuclear Experimental Reactor (ITER) in France.

Benefits offered by Nuclear Fusion Energy

• Clean Energy: Fusion reactions produce minimal radioactive waste compared to nuclear fission, which generates long-lived radioactive waste. Fusion also emits no greenhouse gases, making it an environmentally friendly energy source.
• Safety and Controlled Nature: Fusion reactions are inherently safer than nuclear fission reactions. Fusion reactors have a lower risk of accidents and do not produce runaway chain reactions like fission reactors.
• Energy Security: Fusion provides a reliable and secure source of energy, reducing dependence on fossil fuels and volatile energy markets. It offers a sustainable solution to meet global energy demand.
• High Energy Density: Fusion reactions release a vast amount of energy compared to other energy sources. This high energy density makes fusion power compact and efficient, enabling it to meet large-scale energy needs.
• Scalability: Fusion reactors can be designed to scale up or down to meet varying energy demands. They can serve as base-load power plants or complement renewable energy sources, providing flexibility in the energy mix.
• Minimal Environmental Impact: Fusion power plants have a small footprint and do not require large mining operations or fuel transportation, reducing their environmental impact. They also produce no air pollution or carbon emissions during operation.

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Why in the news

• Researchers at the IceCube Observatory, buried beneath the Antarctic ice, have identified seven potential instances of elusive “Ghost Particles” or astrophysical Tau Neutrinos as they penetrated through Earth.
• These neutrinos are pivotal for understanding the cosmic exchanges between Earth and the vast universe.

What are Neutrinos?

• Neutrinos, often referred to as “ghost particles,” are subatomic particles characterized by their nearly zero mass and lack of electric charge.
• They traverse through matter with minimal interaction, making their detection extremely challenging.
• Previously believed to be massless, evidence has emerged indicating that neutrinos possess a very small mass.
• Neutrinos rank among the most abundant particles in the universe.
• While neutrinos and electrons behave similarly in terms of nuclear forces, neither of them engages in strong nuclear interactions.
• However, both participate in weak nuclear interactions.
• Neutrinos are produced during events such as nuclear fusion in stars like the Sun or nuclear fission in reactors.

Properties of Neutrinos

Significance of Neutrino Detection

• The origins of the abundant neutrino particles remain largely unknown to scientists.
• There’s a hypothesis suggesting their potential role in the early universe shortly after the Big Bang, yet concrete evidence remains elusive.
• Understanding neutrinos better holds the promise of unraveling numerous scientific phenomena, including the mysterious origins of cosmic rays, which neutrinos are known to carry.
• Researchers anticipate that pinpointing the source of neutrinos will aid in explaining the origins of cosmic rays, a puzzle that has perplexed scientists for centuries.

About IceCube Observatory

• Location: The IceCube Neutrino Observatory is situated near the Amundsen-Scott South Pole Station in Antarctica.
• Components:

1. IceCube: The primary detector consists of 5,160 digital optical modules (DOMs) attached to vertical strings frozen into the ice.
2. IceTop: Located on top of IceCube strings, it serves as a veto and calibration detector for cosmic rays.
3. DeepCore: A denser subdetector within IceCube that lowers the neutrino energy threshold for studying neutrino oscillations.

• Construction:

1. Completed in December 2010 with 86 strings deployed over seven austral summers.
2. Involved melting holes in the ice to depths of 2,450 meters and deploying sensors connected to cables.

• Research Goals:

1. Observing neutrinos from various astrophysical sources to study cosmic phenomena like exploding stars, gamma-ray bursts, and black holes.
2. Studying cosmic rays interacting with the Earth’s atmosphere to reveal structures not fully understood.
3. Advancing neutrino astronomy and exploring high-energy processes in the Universe.

PYQs:

(1) In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at the South Pole, which was recently in the news: (2015)

1. It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice.
2. It is a powerful telescope to search for dark matter.
3. It is buried deep in the ice.

Which of the statements given above is/are correct?

1. 1 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3

(2) India-based Neutrino Observatory is included by the planning commission as a mega-science project under the 11th Five-year plan. In this context, consider the following statements: (2010)

1. Neutrinos are chargeless elementary particles that travel close to the speed of light.
2. Neutrinos are created in nuclear reactions of beta decay.
3. Neutrinos have a negligible, but non-zero mass.
4. Trillions of Neutrinos pass through the human body every second.

Which of the statements given above are correct?

1. 1 and 3 only
2. 1, 2 and 3 only
3. 2, 3 and 4
4. 1, 2, 3 and 4

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In the news

• March 14, or 3/14, is celebrated globally as Pi Day, paying homage to the mathematical constant Pi (π).

About Pi Day

• Initiated by: Physicist Larry Shaw of the Exploratorium museum in San Francisco started the tradition in 1988, which has since gained international recognition.
• UNESCO Designation: In 2019, UNESCO designated Pi Day as the International Day of Mathematics, highlighting its significance in promoting mathematical awareness.

What is Pi?

• Mathematical Constant: Pi (π) represents the ratio of a circle’s circumference to its diameter, with a value of approximately 3.14.
• Irrational Number: Pi is an irrational number, with a decimal representation that neither terminates nor repeats.
• Ancient Approximations: Ancient civilizations, including Babylonians and Egyptians, approximated Pi using geometric methods, laying the foundation for its calculation.
• Symbol of Beauty: Pi’s infinite and non-repeating decimal digits evoke a sense of wonder and appreciation for the intricacies of mathematics.

Evolution of Pi Calculation

• Archimedes’ Method: Greek polymath Archimedes devised a method to approximate Pi using inscribed and circumscribed polygons, pioneering early calculations.
• Newton’s Contribution: Isaac Newton revolutionized Pi calculation using calculus, significantly simplifying the process and enabling rapid advancements.
• Modern Computing: With the aid of modern computers, mathematicians have calculated Pi to trillions of decimal places, facilitating precise scientific calculations.

Practical Significance of Pi

• Architectural and Engineering Applications: Pi plays a crucial role in designing structures, shaping engineering solutions, and facilitating accurate measurements.
• Understanding the Universe: Pi’s significance extends to diverse fields, from space exploration to molecular biology, underscoring its universal applicability.
• Intrinsic Value: Despite its vast decimal expansion, Pi holds intrinsic value as a symbol of mathematical beauty and infinity, inspiring exploration and discovery.

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In the news

• Quantum computing holds immense potential, yet many systems operate only at extremely low temperatures, making them costly and commercially unfeasible.
• Researchers are exploring alternative technologies to drive down costs and enhance the commercial viability of quantum computers.

Understanding Qubits and their Fragility

• Classical vs. Quantum: Similar to classical computers, which rely on bits with two states (0 and 1), quantum computers operate using qubits—physical systems with two quantum states.
• Unique Feature: Unlike classical bits, qubits can exist not only in one of the two states but also in a superposed state, where they simultaneously hold both states. However, this superposition is fragile and prone to disruption from external interactions.

Challenges in Qubit Implementation

• Requirement for Identical Qubits: A collection of qubits is necessary for a quantum device, each needing to be identical—a challenge due to manufacturing imperfections.
• Controllability and Robustness: Qubits must be controllable, allowing manipulation and interaction, while also being robust enough to maintain quantum features at room temperature over extended durations.

Exploring Qubit Systems

• Diverse Options: Various physical systems serve as qubits, including superconducting junctions, trapped ions, and quantum dots. However, these systems typically require low temperatures or vacuum conditions for operation.
• High Cost Barrier: The necessity for such conditions renders quantum computers based on these technologies expensive, prompting research into simpler, cost-effective alternatives.

Breakthrough in Room-Temperature Qubits

• Metal-Organic Framework (MOF): In a recent collaborative study reported in Science Advances, researchers in Japan achieved qubits at room temperature within a metal-organic framework.
• Composition: The MOF consists of repeated molecular arrangements, with zirconium as the metal component and an organic molecule containing the chromophore pentacene bridging the metal atoms.
• Singlet Fission Mechanism: Singlet fission, facilitated by interaction between chromophores within the porous MOF networks, generates two triplet excited chromophores from a singlet excited state.
• Enhanced Stability: The rotation of chromophores within the MOF networks modulates interactions, ensuring long-lived coherence of triplet states even at room temperature.

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Why in the News?

• For the first time, an international team of physicists from the Anti-hydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) collaboration has achieved a breakthrough by demonstrating the laser cooling of Positronium.

What is Positronium?

• Positronium comprises a bound electron (e-) and a positron (e+), forming a fundamental atomic system.
• What are its Properties?
  • Concise (short) life where it annihilates with a half-life of 142 nanoseconds.
  • Its mass is twice the electron mass, and it is considered a pure leptonic atom.
  • Its hydrogen-like system, with halved frequencies for excitation, makes it ideal for attempting laser cooling and performing tests of fundamental physics theories.

About AEgIS Initiative

• Timeline: The AEgIS experiment was formally accepted by CERN in 2008, with construction and commissioning continuing through 2012-2016.
• Team: Physicists representing 19 European and one Indian research group from the AEgIS collaboration announced this scientific breakthrough.
• Experiment Location: The experiment was conducted at the European Organization for Nuclear Research (CERN) in Geneva, Switzerland.
• Why this is significant? This experiment serves as a crucial precursor to the formation of anti-hydrogen and the measurement of Earth’s gravitational acceleration on antihydrogen in the AEgIS experiment.

Key Outcomes

• Temperature Reduction: Laser cooling initially brought Positronium atoms from ~380 Kelvin to ~170 Kelvin.
• Laser System: A 70-nanosecond pulse of the alexandrite-based laser system was used to demonstrate cooling in one dimension.
• Frequency Bands: Lasers deployed were either in the deep ultraviolet or infrared frequency bands.

Future Implications

• Spectroscopic Comparisons: Physicists expect this experiment to pave the way for performing spectroscopic comparisons required for Quantum Electrodynamics (QED).
• Potential Applications: The experiment allows for high-precision measurements of properties and gravitational behavior of Positronium, offering insights into newer physics and the production of a positronium Bose–Einstein condensate.

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Introduction

• Researchers have achieved a groundbreaking fusion of brain-like tissue with electronics, creating an ‘organoid neural network.’
• This innovation marks a significant advancement in neuromorphic computing, directly incorporating brain tissue into computer systems.

Brainoware: Brain Tissues in Computers

• Development Team: A collaborative effort by scientists from Indiana University, the University of Cincinnati, Cincinnati Children’s Hospital Medical Centre, and the University of Florida resulted in this breakthrough.
• Publication: The study, published on December 11, signifies a convergence of tissue engineering, electrophysiology, and neural computation, expanding the horizons of scientific and engineering disciplines.

Context of Artificial Intelligence (AI)

• AI’s Foundation: AI relies on artificial neural networks, silicon-based models of the human brain capable of processing vast datasets.
• Memory and Processing Separation: Conventional AI hardware separates memory and processing units, leading to inefficiencies when transferring data between them.

Introducing Biological Neural Networks

• Biocomputing Emergence: Scientists are exploring biological neural networks, composed of live brain cells, as an alternative. These networks can combine memory and data processing.
• Energy Efficiency: Brain cells efficiently store memory and process data without physically segregating these functions.

Organoid Neural Networks

• Biological Components: Brain organoids, three-dimensional aggregates of brain cells, were used to create an ‘organoid neural network.’
• Formation: Human pluripotent stem cells were transformed into various brain cells, including neuron progenitor cells, early-stage neurons, mature neurons, and astrocytes.
• Reservoir Computer: The network was integrated into a reservoir computer, comprising input, reservoir, and output layers.

Brainoware’s Capabilities

• Predicting Mathematical Functions: Brainoware demonstrated its ability to predict complex mathematical functions like the Henon map.
• Voice Recognition: The system could identify Japanese vowels pronounced by individuals with a 78% accuracy rate.
• Efficiency: Brainoware achieved comparable accuracy to artificial neural networks with minimal training requirements.

Promising Insights and Limitations

• Foundational Insights: The study provides crucial insights into learning mechanisms, neural development, and cognitive aspects of neurodegenerative diseases.
• Challenges: Brainoware necessitates technical expertise and infrastructure. Organoids exhibit heterogeneous cell mixes and require optimization for uniformity.
• Ethical Considerations: The fusion of organoids and AI raises ethical questions about consciousness and dignity.

Future Prospects

• Optimizing Encoding Methods: Future research may focus on improving input encoding methods and maintaining uniformity in organoids for longer experiments.
• Complex Computing Problems: Researchers aim to tackle more intricate computing challenges.
• Ethical Discourse: Ethical debates surrounding organoid consciousness and dignity will continue to evolve.

Conclusion

• The creation of Brainoware and the integration of brain organoids with computing systems represent a pioneering step towards more efficient and ethically-conscious AI systems.
• This innovative approach may revolutionize computing paradigms while prompting profound ethical considerations.

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Introduction

• E-readers like the Kindle offer an enjoyable reading experience with their paper-like E Ink displays.
• Developed at MIT in the 1990s, E Ink technology is now owned by E Ink Corporation.

What is E Ink Displays?

• Microcapsules and Charges: E Ink displays operate using microcapsules containing positively charged white particles and negatively charged black particles suspended in fluid. By applying electrical charges, these particles rise to the surface, creating text and images.
• Reflective Light: Unlike LCD and LED displays that require backlighting, E Ink displays reflect ambient light, resembling paper and reducing eye strain during prolonged reading.
• Energy Efficiency: E Ink’s lack of backlighting results in minimal power consumption, as energy is only used when the image changes. This makes it ideal for devices like e-readers and ensures a long battery life.
• Outdoor Legibility: E Ink displays offer high contrast and readability even under bright lighting conditions, unlike LCD/LED displays that suffer under sunlight.

Differentiating E Ink from E Paper

• While often used interchangeably, E Ink and E Paper represent distinct display technologies. E Paper encompasses any screen mimicking real paper.
•  Whereas E Ink specifically employs microcapsules with white and black particles in a clear fluid.

Applications of E Ink Displays

• E Ink in E-Readers: E Ink gained popularity in early e-readers like the Amazon Kindle, offering clear text even in bright sunlight. It remains a feature in Kindle and Kobo e-readers today.
• Brief Stint in Mobile Devices: E Ink briefly appeared in some early cell phones but was eventually replaced by more advanced displays.
• Revival in Mobile Devices: Some startups are reintroducing E Ink in smartphones, emphasizing reduced screen time and enhanced focus on communication and productivity.
• Beyond Mobile Devices: E Ink displays are expanding to various urban applications, including bus stop displays and walking direction signs. Restaurants are adopting E Ink menu boards for their matte, glare-free surfaces and readability in diverse lighting conditions.

Pros and Cons  

• Advantages: E Ink displays excel in low power consumption, making them suitable for devices requiring extended battery life. They also minimize eye strain due to their paper-like visual experience, matte surface, and outdoor readability.
• Drawbacks: E Ink displays have slower refresh rates compared to LCD and OLED screens, rendering them unsuitable for video or animation. They also have limitations regarding color and resolution and remain relatively expensive for larger sizes.

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Introduction

• In 2014, the Royal Swedish Academy of Sciences declared that “the 21st century will be lit by LED lamps,” recognizing the pivotal role of Light-Emitting Diodes (LEDs) in shaping the future of lighting technology.
• This article delves into the fascinating world of diodes, LEDs, and their significance in modern technology.

Understanding Diodes

• Diode Basics: A diode is a small electronic component with two terminals, an anode and a cathode. Its primary function is to allow current flow in one direction only, thanks to a p-n junction.
• P-N Junction: A p-n junction consists of two adjacent materials: a p-type with positive charge-carriers called holes and an n-type with negative charge-carriers – electrons. Electrons can flow easily from the n-type to the p-type but not the other way, granting the diode its one-way current control.
• Anode and Cathode: The anode terminal is connected to the p-type material, while the cathode is connected to the n-type material. These terminals define the diode’s directionality.

Birth of Light-Emitting Diodes (LEDs)

• Electroluminescence: LEDs are diodes that emit light. Electrons, with higher energy levels than holes, release energy when they occupy holes in the p-n junction. If this energy falls within the visible spectrum, light is emitted – a phenomenon known as electroluminescence.
• Band Gap: LEDs achieve specific light colors by ensuring that electron-hole recombination releases a precise amount of energy, determined by the band gap.

Significance of Band Gap

• Energy Levels: Electrons can only have distinct energy values and occupy particular energy levels. These electrons tend to occupy the lowest energy levels available, leading to conductors, insulators, and materials with a band gap.
• Band Gap’s Role: A band gap represents the energy threshold required for electrons to move from lower to higher energy levels, allowing materials to conduct electricity.
• LEDs and Band Gap: In LEDs, the energy emitted during electron-hole recombination corresponds to the band gap, determining the light’s color.

LED’s Color Palette

• Historical Context: Scientists developed red and green LEDs over four decades before achieving blue LEDs. The challenge lay in creating gallium nitride crystals with precise properties for electroluminescence.
• Primary Colors: LEDs can produce red, green, and blue light, offering a versatile color palette. Combining different LEDs enables a broad spectrum of colors on display boards and screens.
• Breakthrough: Japanese researchers, Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura, made a significant breakthrough in the late 1980s, creating a bright blue LED using gallium nitride. Their achievement earned them the 2014 Nobel Prize in Physics.

Advantages of LEDs

• Efficiency: LEDs outperform incandescent bulbs and fluorescent lamps in terms of luminous efficacy, emitting more light per watt of power.
• Durability: LEDs are highly durable, reducing material waste and maintenance costs.
• Diverse Applications: LEDs find applications in diverse fields, from consumer electronics and signage to greenhouse lighting and air quality monitoring.
• Color Versatility: LEDs can emit various colors and frequencies, catering to a wide range of applications.

Future Prospects

• Haitz’s Law: Similar to Moore’s law, LEDs have followed Haitz’s law, predicting cost reduction and increased light output over time.
• Innovations: Ongoing research explores skin-embedded LEDs, organic LEDs, and efficient LEDs made from perovskites, promising further advancements in lighting technology.

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Central Idea

• Researchers have found a 500-year-old herbarium from Italy, particularly Bologna in the north.
• This collection, meticulously crafted by Italian naturalist Ulisse Aldrovandi between 1551 and 1586, offered a window into the past.

Aldrovandi’s Herbarium

• Floristic Changes: The herbarium, containing 5,000 specimens, unveiled a tapestry of historical changes in Italy’s flora over five centuries.
• Human Impact: Clues of human disturbance, habitat loss, transformation, and the invasion of alien species emerged from the pressed and preserved plant specimens.
• Climate Change: The collection allowed insights into the impact of climate change on Italy’s botanical landscape.
• Demographic Trends: European demographic shifts, excluding the European part of the former USSR, were reflected in the herbarium.
• Extinct and Unknown Species: The herbarium hinted at species, both native and alien, that have vanished or remain undiscovered in contemporary times.

Legacy of Transformation

• New World Influence: Aldrovandi’s herbarium holds the memory of Europe’s first encounters with species from the Americas, which later invaded the continent.
• Transforming Flora: It documents the initial signs of a profound transformation in European flora and habitats, paving the way for the introduction of new species and ecological shifts.

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Central Idea

• Have you ever wondered why weather forecasts sometimes go wrong?
• It’s because our atmosphere is a place of constant change and randomness. Predicting exactly what will happen can be really tough.
• We’ll explore this idea of chaos and how it affects not only weather but many other things, from tiny particles to the quantum world.

Chaos in Weather Forecasting

• Randomness in the Atmosphere: Earth’s atmosphere, a laboratory of randomness, constantly changes in terms of pressure, density, gas flow rates, and temperature, making the paths of gas molecules unpredictable.
• The Butterfly Effect: The “butterfly effect” illustrates the idea that a butterfly’s wings flapping in one place can trigger a storm elsewhere, emphasizing the sensitivity of chaotic systems to initial conditions.
• Deterministic Chaos: Chaotic systems, like a pinball machine, follow deterministic physical laws but exhibit seemingly unpredictable behavior. The term “deterministic chaos” implies that precise knowledge of the present is required for accurate future predictions.

Chaos and the Lyapunov Time

• Diverse Applications: Chaos theory finds applications in various fields, from fluid dynamics and human heartbeat irregularities to voting patterns and planetary dynamics.
• Sensitivity to Initial Conditions: Chaotic systems are highly sensitive to their initial conditions, often leading to seemingly random behavior.
• Lyapunov Time: The predictability of a chaotic system depends on factors such as the accuracy of its initial state knowledge and the Lyapunov time, which varies from milliseconds for electrical circuits to millions of years for the inner solar system.

What is Quantum Chaos?

• Quantum Mechanics vs. Chaos: Quantum mechanics, while probabilistic, differs from chaos theory. Subatomic particles lack point-like locations, making it impossible to precisely determine their positions.
• Perturbation Theory: Quantum physics addresses mild disturbances in atomic systems using perturbation theory. Chaos, however, requires a distinct approach, leading to the field of quantum chaos.
• The Rydberg Atom: The Rydberg atom bridges classical and quantum domains. When an atom’s energy levels become nearly continuous due to high excitation, it exhibits classical behavior.
• Spectrum Signatures: Chaos in a Rydberg atom manifests in the spectrum of its energy levels, with irregularities that contrast with the randomness of non-chaotic quantum systems.

Significance of studying Quantum Chaos

• Discrete Energy Steps: Quantum systems feature discrete energy levels, in contrast to classical systems with continuous energy. The Rydberg atom offers a link between these realms.
• Regularities in Chaos: Chaotic quantum systems surprisingly display strong regularities in the distribution of energy levels, an area ripe for exploration.
• Expanding Horizons: Quantum chaos is a burgeoning field of research with implications in thermalization, quantum information, and black hole quantum mechanics, presenting exciting challenges and opportunities.

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Central Idea

• Chinese scientists are constructing the world’s most extensive “ghost particle” detector, named the Tropical Deep-sea Neutrino Telescope (TRIDENT) in the South China Sea.

About TRIDENT Telescope

• Scheduled for completion in 2030, TRIDENT, aptly nicknamed “Ocean Bell” or “Hai ling” in Chinese.
• It will be positioned 11,500 feet (3,500 meters) beneath the ocean’s surface in the Western Pacific.
• It seeks to explore the realm of neutrinos, transient particles that momentarily interact with the deep ocean, emitting faint flashes of light.

Project Timeline

• Pilot Phase (2026): TRIDENT will initiate a pilot project to fine-tune operations.
• Full Deployment (2030): The complete detector will be operational, embarking on a quest to expand the frontiers of neutrino astronomy.

Features of TRIDENT

• Optical Sensors and String Arrays: TRIDENT boasts over 24,000 optical sensors distributed across 1,211 strings, each extending 2,300 feet (700 meters) from the seabed. The detector’s arrangement follows a Penrose tiling pattern, covering a vast 4 km diameter.
• Expansive Coverage: Once operational, TRIDENT will surveil neutrinos within an impressive 7.5 cubic km. In contrast, the world’s largest current neutrino detector, IceCube in Antarctica, encompasses a mere 1 cubic km.
• Enhanced Sensitivity: TRIDENT’s extensive coverage significantly heightens its sensitivity, augmenting its prospects of detecting elusive neutrinos.

Back2Basics: Ghost Particles – Neutrinos

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Central Idea

• In the wake of the recent Hamas attack on Israel, the world witnessed the effectiveness of Israel’s Iron Dome, a remarkable air defense system that intercepts rockets and missiles aimed at Israeli targets.

What is Iron Dome?

• Hezbollah’s Rocket Attacks: The development of the Iron Dome traces back to the 2006 Israeli-Lebanon war when Hezbollah launched thousands of rockets into Israel.
• Israel’s Response: In 2007, Israel initiated the development of an air defense system to safeguard its cities and population, partnering with Rafael Advance Systems and Israel Aerospace Industries.
• Deployment: The Iron Dome became operational in 2011 and has since intercepted over 2,000 rockets, with a claimed success rate of over 90%, though experts estimate it at over 80%.

How does it work?

• Integrated Systems: The Iron Dome comprises three core components that work in unison to provide protection: detection and tracking radar, battle management and weapon control system (BMC), and missile firing units.
• Radar’s Role: The detection and tracking radar identifies incoming threats, accurately tracking them, while the BMC connects the radar and interceptor missile.
• Missile Firing Unit: Once launched, the missile maneuvers independently, targeting small objects, and employs a proximity fuse, activated within ten meters of the target, to ensure precise destruction.

Effectiveness and Deterrence

• All-Weather Capability: The Iron Dome operates effectively in various weather conditions, day and night, enhancing its reliability.
• Cost Considerations: While each battery can cost over $50 million, and an interceptor Tamir missile about $80,000, cost-effectiveness should be measured in terms of lives saved and the nation’s morale.
• Deterrence Factor: The Iron Dome serves as a strong deterrent, preventing adversaries from exploiting inexpensive rocket attacks and bolstering national morale against rocket intimidation.

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Central Idea

• India’s pioneering 3D-printed post office located in Bengaluru’s Cambridge Layout was recently inaugurated.

3D Printed Post Office

• Swift Build: The 3D-printed post office was constructed in just 43 days, surpassing the original deadline by two days.
• Construction Team: Larsen & Toubro Limited undertook the project in collaboration with IIT Madras.

Technological Process

• Spatial Dimension: The post office covers an area of 1,021 square feet and was created using advanced 3D concrete printing.
• Automated Procedure: Robotic printers used an automated process to layer concrete according to the approved design.
• Strong Bonding: A specially formulated quick-hardening concrete ensured strong bonding between layers.
• Rapid Construction: With robotic precision and pre-embedded designs, the project was completed in just 43 days, far shorter than the conventional 6 to 8 months.

Advantages of 3D Printing

• Cost-Effective: The project cost ₹23 lakhs, indicating a 30-40% cost reduction compared to traditional methods.
• Showcasing Technology: The project highlighted concrete 3D printing technology using indigenous machinery and robots, showcasing its scalability.

Distinctive Features

• Continuous Perimeter: The project boasted continuous perimeter construction without vertical joints.
• Flexibility: The 3D printing accommodated curved surfaces and different site dimensions, overcoming flat wall limitations.
• Structural Innovation: Continuous reinforced concrete footing and three-layer walls were created, enhancing structural integrity.
• Reduced Timeline: The innovative technique drastically reduced the construction timeline to 43 days, minimizing material wastage.

Back2Basics: 3D Printing

• 3D printing, also known as additive manufacturing, is a transformative technology that involves creating three-dimensional objects by adding material layer by layer.
• This technology has found applications in various industries, from manufacturing and aerospace to healthcare and fashion.

Here’s an overview of the technology and its key components:

(A) Printing Process: The basic process of 3D printing involves the following steps:

• Design: Create a 3D model using computer-aided design (CAD) software.
• Slicing: The 3D model is divided into thin horizontal layers using slicing software.
• Printing: The 3D printer follows the instructions from the sliced file, depositing material layer by layer to build up the object.

(B) Types of 3D Printing Technologies: There are several 3D printing technologies, each with its own unique approach to material deposition and layering. Some common types include:

• Fused Deposition Modeling (FDM): This is one of the most popular methods. It involves extruding thermoplastic material through a heated nozzle to build up layers.
• Stereolithography (SLA): SLA uses a UV laser to solidify liquid resin layer by layer, creating highly detailed and accurate objects.
• Selective Laser Sintering (SLS): In SLS, a laser fuses powdered material (often plastic or metal) layer by layer to create the object.
• Powder Bed Fusion (PBF): Similar to SLS, PBF involves fusing powder particles using a laser or electron beam to create metal parts.
• Digital Light Processing (DLP): Similar to SLA, DLP uses a projector to cure an entire layer of resin at once.

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Central Idea

• Recently, two South Korean researchers sparked excitement in the physics community by claiming to have achieved Superconductivity at room temperature.
• They claim to have developed a lead-based compound exhibiting superconducting properties at normal room temperature and pressure (NTP) conditions.

What is Superconductivity?

• Zero Resistance: Superconductivity occurs when a material offers almost zero resistance to the flow of electric current, enabling energy-efficient electrical appliances and lossless power transmission.
• Magnetic Behavior: Superconductors also display fascinating behavior under magnetic fields, enabling technologies like MRI machines and superfast Maglev trains.

Exploring the Material LK-99

• Apatite Structure: The Korean group utilized copper-substituted lead apatite, a phosphate mineral with unique tetrahedral motifs, to create LK-99.
• Superconducting Behavior: LK-99 displayed essential superconducting properties, with almost zero resistance to current flow and sudden emergence of resistance above a critical current threshold.
• Magnetic Resilience: LK-99 retained superconductivity even under the presence of a magnetic field until reaching a critical threshold.

Current Superconductors and Their Limitations

• Earlier Discoveries: In the 1980s, scientists found copper oxide materials exhibiting superconductivity above -240°C. Subsequent research yielded limited success in achieving higher temperatures.
• Extreme Conditions: Existing superconductors operate at extremely low temperatures, often below -250°C, close to absolute zero (-273°C).
• Critical Temperatures: Materials like Mercury, Lead, and Aluminum, Tin, and Niobium exhibit superconductivity at critical temperatures just above absolute zero.
• High-Temperature Superconductors: Some materials, labelled ‘high-temperature’ superconductors, display superconducting properties below -150°C.

Scientific Community’s Response

• Cautious Optimism: The scientific community responded cautiously to the claims of LK-99’s room-temperature superconductivity, given previous controversies and unverified claims.
• Technical Errors: Some data in the research papers raised questions and were deemed “sloppy” or “fishy” by independent scientists.
• Replication Efforts: Numerous research groups worldwide are attempting to reproduce the results to validate the claim.
• Mixed Perspectives: The authors’ unwavering confidence in their work contrasts with certain aspects of the research that appear hurried or contentious.

Conclusion

• The search for room-temperature superconductors represents a holy grail in science, promising immense rewards and recognition.
• Although the recent claim by South Korean researchers has captured attention, it awaits rigorous validation.

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Central Idea

• Microsoft researchers have made significant strides in the creation of Majorana zero modes, a type of particle that could revolutionize quantum computing.
• Majorana zero modes, which are their own antiparticles, possess unique properties that could make quantum computers more robust and computationally superior.

Majorana Fermions: A conceptual backgrounder

• Fermions and Antiparticles: All subatomic particles that constitute matter are known as fermions, with each fermion having an associated antiparticle that annihilates upon interaction.
• Majorana Fermions: In 1937, Italian physicist Ettore Majorana discovered that certain particles, known as Majorana fermions, can satisfy specific conditions and be their own antiparticles.
• Neutrinos as Potential Majorana Fermions: Neutrinos are one type of subatomic particle that scientists speculate may exhibit Majorana fermion behavior, although experimental confirmation is still pending.

Understanding Majorana Zero Modes

• Quantum Numbers and Spin: All particles have four quantum numbers, with one called the quantum spin having half-integer values for fermions. This property allows any fermion, even a large entity like an atom, to be classified as a fermion.
• Bound States and Fermions: Bound states composed of two particles can also be classified as fermions if their total quantum spin possesses a half-integer value.
• Majorana Zero Modes: When these bound states are their own antiparticles and do not readily de-cohere, they are known as Majorana zero modes, which have been sought after by physicists for many years.

Potential Benefits for Computing

• Enhanced Stability: Majorana zero modes offer increased stability for qubits, the fundamental units of information in quantum computing. Even if one entity within the bound state is disturbed, the qubit as a whole can remain protected and retain encoded information.
• Topological Quantum Computing: Majorana zero modes can enable topological quantum computing, which takes advantage of non-Abelian statistics. These statistics introduce an additional degree of freedom, allowing algorithms to produce different outcomes based on the order in which steps are performed.

Challenges and Future Prospects

• Creating Majorana Zero Modes: Scientists have been exploring various setups, such as topological superconductors, to generate Majorana zero modes. However, confirming their existence remains a challenge, as their effects on surrounding materials must be inferred indirectly.
• Recent Advances by Microsoft Researchers: Microsoft researchers recently engineered a topological superconductor using an aluminium superconductor and an indium arsenide semiconductor. Their device passed a stringent protocol, suggesting a high probability of hosting Majorana zero modes.

Future prospects

• While this achievement is significant, the existence of Majorana fermions and their potential for topological quantum computing still need independent confirmation.
• Continued improvements in simulation, growth, fabrication, and measurement capabilities are necessary to achieve the desired topological gap for coherent operations.

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Central Idea

• Physicists at CERN’s Large Hadron Collider (LHC) reported detecting a rare decay of the Higgs boson into a Z boson and a photon.
• The decay process provides valuable insights into the Higgs boson and the nature of our universe.

Understanding the Higgs Boson

• The Higgs boson is a type of subatomic particle that carries the force of particle movement through the Higgs field, present throughout the universe.
• Interaction with Higgs bosons determines a particle’s mass, with stronger interaction leading to greater mass.

Importance of Higgs Boson Decay

• Studying how different particles interact with Higgs bosons and understanding the properties of Higgs bosons helps reveal information about the universe.
• The recent detection of Higgs boson decay to a Z boson and a photon provides noteworthy insights.

Role of Virtual Particles

• Quantum field theory suggests that space at the subatomic level is filled with virtual particles that constantly appear and disappear.
• Higgs bosons interact fleetingly with virtual particles during their creation, resulting in the production of a Z boson and a photon.

New Result and Probability

• The Standard Model predicts that the Higgs boson will decay into a Z boson and a photon 0.1% of the time.
• The LHC needed to produce a significant number of Higgs bosons to observe this decay pathway.

Confirmation and Statistical Precision

• The ATLAS and CMS detectors, which previously observed the decay independently, combined their data for increased statistical precision.
• Although the significance is not yet 100%, the combined data enhanced the confirmation of the Higgs boson decay.

Significance for the Standard Model

• Physicists seek to detect and validate the predicted decay pathways of the Higgs boson according to the Standard Model.
• Precise testing of the model’s predictions helps identify potential deviations and explore new theories in physics.

Implications for New Theories

• Higher decay rates through the observed pathway could support new theories beyond the Standard Model.
• Experimental evidence from the LHC could contribute to advancements in scientific understanding.

Back2Basics: Standard Model

• The Standard Model is a theoretical framework in physics that describes the fundamental particles and their interactions, except for gravity.
• It provides a comprehensive understanding of three of the four fundamental forces: electromagnetic, strong nuclear, and weak nuclear forces.
• Developed in the mid-20th century, the Standard Model has been highly successful in explaining and predicting the behaviour of elementary particles.

Key points about the Standard Model:

1. Particle Classification: The Standard Model classifies particles into two main categories: fermions and bosons.

• Fermions: Fermions are particles that make up matter. They are further categorized into quarks and leptons. Quarks are the building blocks of protons and neutrons, while leptons include electrons and neutrinos.
• Bosons: Bosons are force-carrying particles responsible for transmitting the fundamental forces. Examples include photons (electromagnetic force), gluons (strong nuclear force), and W and Z bosons (weak nuclear force).

1. Fundamental Forces: The Standard Model explains the interactions between particles through the following fundamental forces:

• Electromagnetic Force: Mediated by photons, this force governs the interactions between charged particles.
• Strong Nuclear Force: Mediated by gluons, it binds quarks together to form protons, neutrons, and other particles.
• Weak Nuclear Force: Mediated by W and Z bosons, it is responsible for certain types of radioactive decay.

1. Higgs Field and Higgs Boson: The Standard Model introduces the concept of the Higgs field, an energy field that permeates the universe. Particles acquire mass through their interaction with this field. The existence of the Higgs boson, a particle associated with the Higgs field, was confirmed in experiments at the Large Hadron Collider (LHC) in 2012.

Limitations and Open Questions:

While the Standard Model has been highly successful in describing particle interactions, it has some limitations:

• Gravity: The theory does not include a description of gravity, which is described by general relativity. Combining gravity with the other forces remains a challenge.
• Dark Matter and Dark Energy: The Standard Model does not account for dark matter and dark energy, which are believed to constitute a significant portion of the universe.
• Unification: The theory does not provide a unified description of all forces, including electromagnetism, weak nuclear force, and strong nuclear force.

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Central Idea

• The Foucault pendulum is a device that proves the Earth’s rotation and has been installed in the new Parliament building in New Delhi.
• It was designed and installed by the National Council of Science Museums (NCSM), Kolkata.

Foucault Pendulum: A Unique Invention

• Historical Context: In 1851, the Foucault pendulum experiment conclusively demonstrated the Earth’s rotation, settling debates about the planet’s movement.
• Leon Foucault: The French scientist invented the Foucault pendulum and invited scientists and the public to witness the Earth’s rotation through the experiment.
• Working: The pendulum consists of a heavy iron ball suspended by a steel wire and swings in a plane, mimicking the Earth’s rotation on its axis.
• Exhibition at the Pantheon: The demonstration took place at the Pantheon in Paris, where the ball’s motion represented the Earth’s rotation.

Significance

• Earth’s Rotation as a Scientific Fact: The Foucault pendulum experiment solidified the understanding that the Earth rotates on its axis.
• Supporting Astronomical Studies: The knowledge of the Earth’s rotation is crucial for studying various astronomical phenomena, such as day and night cycles and seasonal changes.
• Continual Scientific Inquiry: The Foucault pendulum experiment encouraged further research into the Earth’s rotation and its implications for our understanding of the universe.

Modern Applications and Further Exploration

• Educational Installations: The inclusion of a Foucault pendulum in the new Parliament building in New Delhi provides an opportunity for public education and scientific engagement.
• Technological Advancements: Advances in technology, such as precision instruments and digital monitoring, can enhance the accuracy and impact of Foucault pendulum installations.
• Continued Research: Ongoing scientific studies and experiments can deepen our understanding of the Earth’s rotation and its relationship to other celestial bodies.
• Space Exploration: Exploring the Earth’s rotation from space can offer unique perspectives and insights into its dynamics.

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Central Idea: A recent study has shown that Calcium-41 can be used in a similar way as Carbon-14 in carbon dating, but with several advantages.

Carbon Dating and its limitations

• Carbon-14 is an unstable and weakly radioactive isotope of carbon.
• It has a half-life of 5,700 years and is used to estimate the age of carbon-based materials.
• Radiocarbon dating provides objective age estimates for materials from living organisms.
• Carbon-14 cannot determine the age of objects older than approximately 50,000 years.
• Three techniques are used to measure carbon-14 content: gas proportional counting, liquid scintillation counting, and accelerator mass spectrometry.

Introducing Calcium-41

• Calcium-41 is a rare long-lived radioisotope of calcium with a half-life of 99,400 years.
• It is produced through cosmic ray interactions in the soil and is found in the Earth’s crust.
• Calcium-41 occurs less frequently than carbon-14.

Method used: Atom Trap Trace Analysis (ATTA)

• ATTA is a technique proposed by researchers at the University of Science and Technology of China.
• It is based on laser manipulation and detection of neutral atoms.
• The sample is vaporized, and the atoms are laser-cooled and loaded into a light and magnetic field cage.
• By tuning the laser’s frequency, Calcium-41 atoms can be detected through electron transitions.

Significance and Applications

• ATTA can detect one Calcium-41 atom in every 10^16 calcium atoms in seawater with 12% precision.
• It is selective and avoids confusion with potassium-41 atoms.
• ATTA can be adapted to study other isotopes, such as argon-39, krypton-81, and krypton-85.
• The applications of ATTA and Calcium-41 include dating rocks covered by ice and exploring Earth-science applications.

Also read:

What is Carbon Dating? How does it work?

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Central Idea: The Department of Telecommunications (DoT) has developed an artificial-intelligence-based facial recognition tool called Artificial Intelligence and Facial Recognition powered Solution for Telecom SIM Subscriber Verification (ASTR).

What is ASTR?

• ASTR is designed to check subscriber databases of telecom operators to identify multiple connections associated with the same person.
• The goal of ASTR is to detect and block fraudulent mobile connections, thereby reducing cyber frauds.

Development of ASTR

• In 2012, DoT issued an order requiring telecom operators to share their subscriber database, including users’ pictures, with the department.
• These images serve as the core database for facial recognition using ASTR.
• The ASTR project was conceptualized and designed by the DoT’s unit in Haryana between April 2021 and July 2021.
• A pilot project was conducted in Haryana’s Mewat region to test the feasibility of ASTR, where a significant number of fraudulent SIMs were detected.

How ASTR works?

• ASTR uses convolutional neural network (CNN) models to encode human faces in subscribers’ images, accounting for various factors like face tilt, angle, image opaqueness, and dark color.
• A face comparison is performed for each face against all faces in the database, grouping similar faces under one directory.
• ASTR considers two faces to be identical if they match to a minimum extent of 97.5%.
• It can detect all SIMs associated with a suspected face within 10 seconds from a database of 1 crore (10 million) images.
• After matching faces, ASTR’s algorithm utilizes “fuzzy logic” to find approximate matches for subscriber names, considering variations, typographical errors, and related results.

Impact and Results

• In the first phase, ASTR analyzed over 87 crore (870 million) mobile connections and detected more than 40 lakh (4 million) cases of people using a single photograph to obtain multiple connections.
• After verification, over 36 lakh (3.6 million) connections were discontinued by telecom operators.
• The list of fraudulent connections is also shared with banks, payment wallets, and social media platforms to disengage these numbers from their respective platforms.
• WhatsApp collaborated with the government to disable accounts created using such numbers, and similar efforts are being made with other social media platforms.

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Researchers in the UK, led by Nobel laureate Andre Geim, have discovered magnetoresistance in graphene – a single-atom-thick layer of carbon atoms bonded in a honeycomb pattern – that further distinguishes this ‘wonder’ material.

Graphene’s anomalous Giant Magnetoresistance (GMR)

• Graphene displayed an anomalous giant magnetoresistance (GMR) at room temperature.
• GMR is the result of the electrical resistance of a conductor being affected by magnetic fields in adjacent materials.
• It is used in hard disk drives and magnetoresistive RAM in computers, biosensors, automotive sensors, micro-electromechanical systems, and medical imagers.

What is GMR?

• GMR is a phenomenon where the electrical resistance of a conductor is affected by magnetic fields in adjacent materials.
• Say a conductor is sandwiched between two ferromagnetic materials (commonly, metals attracted to magnets, like iron).
• When the materials are magnetised in the same direction, the electrical resistance in the conductor is low.
• When the directions are opposite each other, the resistance increases.

Significance of the finding

• The magnetoresistance observed in the graphene-based device was almost 100 times higher than that observed in other known semimetals in this magnetic field range.
• In the study, the magnetoresistance in monolayer graphene at 27º C held between two layers of boron nitride increased by 110% under a field of 0.1 tesla.
• To compare, the magnetoresistance in these conditions increases by less than 1% in normal metals.
• The team attributed this to the presence of a ‘neutral’ plasma and the electrons’ mobility.

Try this MCQ

Which of the following best describes magnetoresistance?

(a) The magnetic resistance of a conductor to electrical current flow

(b) The phenomenon where the electrical resistance of a conductor is affected by magnetic fields in adjacent materials

(c) The ability of a conductor to produce a magnetic field when an electrical current is passed through it

(d) The resistance of a magnet to demagnetization by an external magnetic field