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  Lecture 15 Defense Sector(Part 2)  Naval Strength of India Landing Platform Dock(LPD)- Also known as amphibious transport dock is a warship that embarks transports and landing elements for expeditionary warfare missions. INS Jalashwa(जलाश्व) is only amphibious transport dock currently in service with the Indian Navy that was bought from USA.  Warship Size Corvette < Frigates < Destroyer < Cruiser < Aircraft carrier Corvettes- Smallest of the warships. The ships smaller than Corvettes are fast attack crafts and patrol ships.  Frigates- Larger than Corvettes but smaller than Destroyers and used to protect other ships.  Frigates class- Shivalik class, Brahmaputra, Godavari and Talwar class(India + Russia)  Project 17A- 7 frigates named INS Nilgiri, INS Himgiri, INS Udaygiri, INS Dunagiri, INS Taragiri, INS Vindhyagiri and INS Mahendragiri by Mazagon Dock Shipbuilders(MDL) + Garden Reach Shipbuilders & Engineers(GRSE)  Destroyer- M...

  Lecture 14 Defense Sector(Part 1)  Multilateral Export Control Regime(MECR)  To restrict the misuse of Defense technology against humanity there are some intercontinental convention and export control regime.  A multilateral export control regime(MECR) is an informal group of like-minded supplier countries that seek to contribute to the non-proliferation of weapons of mass destruction, delivery systems and advanced conventional weapons through national implementation of guidelines and control lists for exports. 4 International Export Control Regimes- Wassenaar Arrangement(WA)- Control of conventional arms and dual use goods and technologies Australia Group(AG)- Control of chemical and biological technology that could be weaponized Missile Technology Control Regime(MTCR)- Control of rockets and other aerial system capable of delivering weapons of mass destruction(technology capable of carrying greater than 500 kg payload for more than 300 km).  Nuclear Suppl...

  Lecture 12 Space Exploration(Part-1)  Space and Earth Orbits Karman line- Boundary separating Earth's atmosphere and outer space. It lies above 100 Km of mean sea level.  Orbit- Curved trajectory of an object around a star or planet.  Earth orbits Low Earth orbit (LEO)- Altitudes up to 2,000 km Medium Earth orbit(MEO)- Altitude from 2,000 km to below geosynchronous orbit  Geosynchronous orbit(GSO)- Orbit with an orbital period of Earth's rotation i.e. 23 hours 56 minutes and 4 seconds(one sidereal day).  Geostationary orbit(GEO)- A circular geosynchronous orbit in the plane of the Earth's equator with an altitude of approximately 36000 km. The object placed in geostationary orbit maintains the same position relative to the Earth's surface. Geostationary Transfer orbit(GTO)- Transfer orbits are a special kind of transit orbit used to send object from one orbit to another.  High Earth orbit(HEO)- Altitudes above 36,000 Km Polar orbit- Satellite...

  Lecture 11 Lens, Mirror and Telescope Lens An optical tool that converges and diverges a light beam by refraction. Lenses are of mainly two types called concave and convex. Mirror Polished and smooth reflecting surface with two types- plain mirror and spherical mirror.  Spherical mirror have the spherical reflecting surface and are of two types- concave mirrors and convex mirrors. Telescope Device used to observe distant things by gathering electromagnetic radiation like visible light, UV wave, X ray etc. Types of telescopes(Based on location)  Ground based telescope- Telescope installed on earth surface.  Space based telescop- Atmosphere is opaque for most of the electromagnetic spectrum, only a few bands can be observed from the Earth's surface. So for telescope with operating frequency higher than visible light are installed in space only. For visible light and lower frequency telescope can be installed either at ground or space with space based telescope have...

  Lecture 10 Computer, Display and Batteries Computer Supercomputer- Computer with a high level of performance as compared to a general purpose computer. The performance of a supercomputer is commonly measured in PETAFLOP (FLOPS- floating point operations per second) instead of million instructions per second(MIPS).  National Supercomputing Mission 2015 was launched with C-DAC Pune and IISc Banglore as implementing agency.  India’s first supercomputer was PARAM 8000 . PARAM Shivay, the first indigenously assembled supercomputer was installed in IIT BHU, followed by PARAM Shakti(IIT-Kharagpur), PARAM Brahma(IISER, Pune). Quantum Computer- Quantum computer take advantage of quantum mechanics to solve complex problems that classical computers or supercomputers can't solve. The basic unit of information in quantum computing is qubit/quantum bit which serves the same function as the bit in classical computing. Qubit can exist in more than one state at the same time. In quan...

  Lecture 9 Mobile and Related Technologies Mobile Phone A portable telephone able to make and receive calls over a radio frequency link while the user is moving within a service area.  Evolution of Mobile- 0G- vehicle attached device(Finland, 1971)  1G Phone- Motorola developed handheld phone in 1973 1G network- network was setup in Japan in the year 1979(FDMA technology)  2G system- Finland 1991(TDMA, CDMA technology)  2.5G- General Packet Radio Service(GPRS system)  2.75G- Enhance Data rate for GSM Evolution(EDGE) 3 times faster than GPRS 3G system- Japan 2001(universal mobile telecom service)  3.5G- high speed downlink packet acess 3.75G- high speed uplink packet acess 4G- Long Term Evolution(LTE), Voice over LTE(VoLTE- voice call over internet), mobile app 5G- high data speed using high frequency for data transmission(100 times faster than 4G), IoT, VR/AR 6G- 100 times faster than 5G, Terahertz(THz) frequencies, XR, Blockchain   El...

Lecture 8 Matter, Atom and Elementary Particles Matter Any substance having mass and volume.  Based on physical conditions, such as temperature and pressure there are 5 states of matter Solid Liquid Gas Plasma- Presence of a significant portion of charged particles because of very high temperature Bose Einstein condensate- At absolute zero temperature atoms act as a single unit and the state is known as Bose Einstein condensate. This state of matter was predicted by Satyendra Nath Bose and Albert Einstein.  Atom Smallest unit of matter consists of three subatomic particles(protons, neutrons, and electrons) with center known as the nucleus. The nucleus consists of the heavier atoms(protons and neutrons) while electrons orbit around the atomic nucleus in the outermost shells of an atom. John Dalton discovered the atomic theory(Atom) and It's nucleus was discovered by Ernest Rutherford.  In a neutral atom,  Number of electrons = Number of protons Atomic Number- The n...