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Nuclear Reactor - Understanding how it works | Physics Elearnin video
Nuclear reactors are the modern day devices extensively used for power generation as the traditional fossil fuels, like coal, are at the breach of extinction. A nuclear reactor is the source of intense heat which is in turn used for generation of power in nuclear power station. Its mechanism is similar to that of a furnace in a steam generator; the steam is used to drive the turbines of the electric generator system.
A nuclear reactor consists of three crucial components: Fuel elements, moderator and control rods.
Fuel elements come usually in the shape of thin rods of about 1cm in diameter and contain fissionable nuclei, like Uranium (235 92U or 238 92U). These rods vary in number according to the size of the reactor, in large power reactor thousands of fuel elements are placed close to each other. This region where these fuel elements are placed is called the reactor core. These fuel elements are normally immersed in water which acts as a moderator.
The objective of a moderator is to slow down the energy neutrons in a nuclear reactor which are produced during the nuclear fission process by the fuel elements. Thermal neutrons, which are neutrons with energy of about 0.04 electron volts, are capable of producing fission reaction with 235 92U. During the fission reaction process, new neutrons are given out which have energies of about 1 MeV. These neutrons of typically escape from participating in another fission process as they are accompanied by enormous energy release. In f -ct, the probability of these neutrons produce another fission reaction is 500 times less than as compared to that of a thermal neutron. This is where moderator is extremely useful. Moderator has the capability to slow down, or in other words moderate, the speed of these high-energy neutrons, so that they can in turn be used for a chain reaction to trigger multiple fission reactions of other 235 92U nucleus.
Commonly, ordinary or heavy water is used as moderator in nuclear reactors because of the deuterons present in them which are capable of slowing the neutron speed. Water molecules in the moderator are useful in slowing down the high-energy neutrons which leave the fuel-element after nuclear fission. These high-energy neutrons collide with water molecules thereby losing out on some energy with every collision and therefore slow down substantially. A new fission reaction can now be triggered using this slow neutron by striking it with the fuel element.
The third and of the most prominent part of a nuclear reactor are the control rods. In order to get a steady output of energy from the nuclear reactor, every single nuclear fission reaction should trigger another fission reaction and ensure the availability of a spare neutron released to trigger the chain reaction. By controlling the number of spare neutrons available at any given time, the rate of the nuclear fission chain reaction can be controlled. This control on the fission reaction can be maintained using the control rods.
The main function of the control rods is to absorb any excess or spare neutron in the moderator in order to prevent any further fission reaction. Usually such control rods are made of Boron or Cadmium. To increase the rate of fission reactions, these rods can be removed from the moderator. A steady output of energy can be thus maintained by inserting or removing the control rods in the nuclear reactor.
Now that we know the components of a nuclear reactor, let us understand the working of a nuclear reactor. It is usually enclosed in a shield made of thick concrete walls. It consists of a reactor core, pump and heat exchanger. The reactor core and pump are in placed in contact with the water, which is usually the heat exchanger used in reactors. Due to the enormous amount of heat released dusing nuclear fission reaction, this surrounding water gets heated up and changes to steam, which is in turn used to turn the turbines. Thus huge heat energy gets converted into electrical energy. Water is continuously flown in and out of the nuclear reactor using the pump.
Thus a nuclear reactor successfully generates nuclear energy from fission reaction.
Ever wonder what actually goes on, day-to-day, at a nuclear reactor? Get an insider's tour of MIT's!
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What's the difference between a nuclear reactor and a nuclear weapon? A lot more than you'd think.
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Movie clips from:
Bad Boys (1995), Columbia Pictures
Chain Reaction (1996), 20th Century Fox
Nuclear test film: https://archive.org/details/gov.doe.0800013, https://archive.org/details/gov.doe.0800003, https://archive.org/details/gov.doe.0800000, https://www.youtube.com/watch?v=xwpgmEvlRpM
Aircraft crash test from Sandia National Laboratories (1988)
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This Hubblecast Light highlights the exciting discovery of the first water detected on a potentially habitable planet. With data from the NASA/ESA Hubble Space Telescope, water vapour has been detected in the atmosphere of a super-Earth with habitable temperatures by University College Longon (UCL) researchers.
More information and download options: http://www.spacetelescope.org/videos/heic1916a/
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Credit:
Directed by: Bethany Downer
Editing: Nico Bartmann.
Web and technical support: Mathias Andrรฉ and Raquel Yumi Shida.
Written by: Bethany Downer & UCL
Music: tonelabs โ Orion Fog (http://tonelabs.com)
Footage and photos: ESA/Hubble, M. Kornmesser, NASA's Goddard Space Flight Center Conceptual Image Lab
The near-term acceleration of the rate of temperature change shows an urgent need for research on the impacts of these changes for the environment and the human-built world. So, do we really need to grow into space? How can we do it in a sustainable way? It is high time for an integrated discussion of space matter with planetary concerns.
Our new comic series 'Space Rocks' will address these concerns adapted from the latest research articles. Stay tuned for more information.
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Learn about the first astronauts to go to the moon, the first person to go to space, and the spaceship that took the first Americans to the moon.
Satellite Orbits - A step-by-Step tutorial by the K12 Space Science and Satellites Academy |BRS-Labs
What is the importance of the accurate design of a satellite orbit?
For more information about our courses, certificates, and to watch free samples of the lectures, please visit our K12 Space Science & Satellites Academy at: http://k12-space-academy.com/ for junior students (aged 10 to 17) or visit our Remote Sensing Portal at: https://remote-sensing-portal.com/ for undergraduates, postgraduates and professionals. Also, to get notified with our offers, you can like us on our Facebook page https://www.facebook.com/BRSLabs/ and subscribe to our YouTube channel.
What Are the Perturbations that influence a Satellite's Lifetime? They are Atmospheric Drag, Earth Magnetic Field, Earth Gravity Gradient, and Solar Radiation Pressure.
For more information about our courses, certificates, and to watch free samples of the lectures, please visit our K12 Space Science & Satellites Academy at: http://k12-space-academy.com/ for junior students (aged 10 to 17) or visit our Remote Sensing Portal at: https://remote-sensing-portal.com/ for undergraduates, postgraduates and professionals. Also, to get notified with our offers, you can like us on our Facebook page https://www.facebook.com/BRSLabs/ and subscribe to our YouTube channel.
TPK Learning is a digital platform designed to help students, parents, and teachers make learning easier and more accessible, anywhere and for everyone. We are using technology the way it should be used - as a valuable tool for positive change.
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ะะตะบะพัะพััะต ะฒะพะฟัะพัั ะพ ะบะพัะผะพัะต ะพััะฐัััั ะฐะบััะฐะปัะฝัะผะธ ะฒัะตะณะดะฐ: "ะััั ะปะธ ะถะธะทะฝั ะทะฐ ะฟัะตะดะตะปะฐะผะธ ะฟะปะฐะฝะตัั ะะตะผะปั?", "ะััั ะปะธ ะฒะพ ะัะตะปะตะฝะฝะพะน ะฟะปะฐะฝะตัั, ะฟะพั
ะพะถะธะต ะฝะฐ ะะตะผะปั?" ะะฐ ะดะฐะฝะฝัะน ะผะพะผะตะฝั ัะบะทะพะฟะปะฐะฝะตัะฐ Kepler-1649c ัะฒะปัะตััั ัะฐะผะพะน ะฟะพั
ะพะถะตะน ะฝะฐ ะฝะฐัั ะฟะปะฐะฝะตัะพะน. ะ ะฐะทะฒะต ััะพั ัะฐะบั ะฝะต ะฒัะตะปัะตั ะฝะฐะดะตะถะดั, ััะพ ะพะฝะฐ ะผะพะถะตั ััะฐัั ะฝะฐัะธะผ ะฝะพะฒัะผ ะดะพะผะพะผ?
ะะฐ ัะฐะผะพะผ ะดะตะปะต ะฒ ะบะพัะผะพัะต ะฟะพะปะฝัะผ-ะฟะพะปะฝะพ ัััะฟัะธะทะพะฒ ะธ ะฝะตะพะฑััะฝัั
ะฝะตะฑะตัะฝัั
ัะตะป. ะะฐะฟัะธะผะตั, ะตััั ะฟะปะฐะฝะตัั, ะณะดะต ะฒัะตะณะดะฐ ัะฐัะธั ะฝะพัั, ะฐ ะตััั ัะฐะบะธะต, ะณะดะต ะธะดะตั ะดะพะถะดั ะธะท ััะตะบะปะฐ, ะธ ะฟะปะฐะฝะตัั ั ะฐะปะผะฐะทะฝัะผ ัะดัะพะผ. ะฃั
ัั! ะฅะพัะตะป ะฑั ั ัะปะตัะฐัั ะฝะฐ ัะฐะบัั ะฟะปะฐะฝะตัั!
ะัะทัะบะฐ: Epidemic Sound https://www.epidemicsound.com/
ะะพะดะฟะธัะธัะตัั ะฝะฐ AdMe: http://goo.gl/DgUonf
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ะกัะพะบะพะฒัะต ะผะฐัะตัะธะฐะปั (ัะพัะพะณัะฐัะธะธ, ะฒะธะดะตะพ ะธ ะดััะณะธะต):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
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ะะพะปััะต ะบะปะฐััะฝัั
ััะฐัะตะน ะธ ะฒะธะดะตะพ ะฝะฐ http://adme.ru/
Don't forget to follow along or check out this really helpful YouTube Channel for art lessons: "Art for Kids Hub"
Please visit their animal artworks playlist for some really good art tutorials for the little ones (elementary or any grade level). For example, the cheetah tutorial, monarch butterfly tutorial, peacock, or the toucan are all good videos to use as a substitute art lesson!
Just type into the youtube search bar, "art for kids hub" along with the name of an animal that you want to draw, and suggested videos will show up (:
Feel free to let me know if you have any questions! As always, thank you for watching.
in this video you will learn about the universe and space, the solar system has many planets, stars, and artificial satellites. the complete space technology along with the different high-resolution tools used for space operations is discussed in this chapter. go through it and share your views in the comment section.
Access eLearn Digital content/ videos on mobile. Download eLearn App from Google play store|| Animated science video || elearn K12
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eLearn is the official repository of digitized textbooks of Punjab. Each book has been augmented with Video Lectures, Illustrations, Animations, Simulations, and Interactive Assessments. Through this website, you can access 30 Science, and Maths textbooks for Grade 1-12. eLearn is developed by Punjab Information Technology Board in collaboration with Punjab Curriculum & Textbook Board and the School Education Department.
Developed and Contributed by Hafsa Sadaf (freelancer)
Unit 17 Stars and the Solar System
The negative impacts of climate change fall disproportionately on low income communities and communities of color, and yet they are too often underrepresented in conversations about solutions to climate change. Schools must center equity and follow the lead of these communities to advance environmental justice.
K12 Climate Action is on a mission to unlock the power of the education sector to be a force for climate action, solutions, and environmental justice. Learn more about K12 Climate Action at K12ClimateAction.org.
Descriptive Transcript:
Climate change impacts everyone, but not equally. The negative impacts of climate change fall more on communities of color and low-income communities. Too often, their experiences are left out of the climate conversation, but these voices belong at the center of the search for solutions. To advance equity we must center the experiences of communities that are impacted most and support policies for environmental justice in schools to build a more sustainable, resilient, and equitable future. Mitigate, adapt, advance equity, educate. This is Planet Ed. K-12 Climate Action. The Aspen Institute. Share if you want to see a sustainable and equitable society K12ClimateAction.org #k12ClimateAction
Mysterious Sounds From Space #Shorts
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Galaxy Song, taken from Monty Python's The Meaning of Life. Terry Jones picked this as part of his Top 10 Monty Python Movie Moments for Esquire Magazine -
"It's such a lovely song. I think it's one of the best things Eric [Idle]'s ever done. There was going to be more animation but Terry was so busy with other parts of the film we ended up using more of the live-action parts that I'd shot for safety."
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The guys at the Stan Winston Studio are having some fun with an unused helmet & head that Digital Domain requested for Ron Howard's Apollo 13. The creators decided not to use it because it was too gory.
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Professor John Tagg talks briefly about how probiotic Streptococcus salivarius BLIS K12 fights the bacteria that cause bad breath.
Pale Blue Dot is NOW AVAILABLE as an audiobook
https://www.audible.com/pd/Sci....ence-Technology/Pale
As seen in 2014's COSMOS: A SpaceTime Odyssey
Written by Ann Druyan and Steven Soter
Cosmos Studios, Inc., Copyright ยฉ 2013
Passage written by Carl Sagan for the book Pale Blue Dot published by Random House,
Copyright ยฉ1994 Democritus Properties, LLC
DOWNLOAD / DVD / LICENSE @ https://www.naturerelaxation.c....om/products/splendor | WATCH ON DEMAND (no Ads or Watermarks) @ https://watch.naturerelaxation.....com/videos/splendor | SPLENDOR: (noun) brilliant or gorgeous appearance; grandeur. | ABOUT THE FILM: The latest - and greatest yet- of our extended length ambient films, "Splendors of Nature" sweeps viewers on an all-day-long, breathtakingly beautiful & immersive audiovisual journey that dives deep into very heart of Nature. Featuring countless displays of grandeur from the around the world, this 12 hour long film offers a seamless relaxation experience that gently flows from one wonder to the next. From snowy mountain forests to swimming with colorful coral reef sea life; from the plains of Africa to the distant fjordlands of Iceland, this Nature Relaxation film truly has something for everyone - even space lovers! MORE INFO / CREDITS:
SPLENDORS OF NATURE is a compilation of multiple existing films from our collection, including:
Snowy Mountain Dreamland
Birds of the Rainforest
Flying Over Oahu
Redwood Forest Rejuvenation
Amazing Africa (The Animals Video was filmed by Robert Hofmeyr, ProArtInc, for more Animal videos please visit https://www.youtube.com/watch?v=3xPkwNu2o8g&t=12404s )
Flying Over Italy
Rainbow Reef Relaxation
Dolphin Voyage Relaxation
Islands from Above
Above the Tulip Fields
Rainbow Waterfall Relaxation
America's Beautiful West
Turtle Paradise
Above the Dolomites
Beyond Infinity
Coming Shortly to Nature Relaxation On-Demand. Try free for 30 days @ https://www.NatureRelaxation.com/Try
CREDITS: Featuring Cinematography by David Huting, Nick Skeyes, Noel Thomas, Peter Schneider, Tilo & Yvonne Kuhnast, Roman Khomylak, and Nimanty; learn more about the team of creators behind NRF @ https://www.NatureRelaxation.com/Team
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NASA's Kepler mission has confirmed the first near-Earth-size planet in the โhabitable zoneโ around a sun-like star. This discovery and the introduction of 11 other new small habitable zone candidate planets mark another milestone in the journey to finding another โEarth.โ
The newly discovered Kepler-452b is the smallest planet to date discovered orbiting in the habitable zone -- the area around a star where liquid water could pool on the surface of an orbiting planet -- of a G2-type star, like our sun. The confirmation of Kepler-452b brings the total number of confirmed planets to 1,030.
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