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Lecture Description In this final lecture of the series, Feynman discusses the problems which motivated the development of Quantum Electrodynamics, and further problems in the Standard Model of Particle Physics. This includes the Electroweak Theory developed by Steven Weinberg, Abdus Salam and Sheldon Glashow, describing the change of particle flavour by means of a type of neutral current which is asymmetric in nature (found in the study of neutrino flavour change in neutrino detectors and the helicity of neutrinos from the polarisation of beta decay experiments found earlier by Chien-Shiung Wu and her colleagues) and in the detection of particles which break the symmetry in electrodynamic and weak interactions, namely the Z-boson wose S matrix matches that of a photon at energies exceeding 100GeV, giving the so-called Electroweak Force. Moreover, the theory of Nuclear Interactions, in and of themselves, was discovered prior to this, and the interaction of force-carrier particles in the nucleus assumed to exist as a type of propagating Residual Strong Nuclear force which acts in the potential well of the nucleus, gaining strength away from the nuclear well asymptotically. This explains the missing mass of the atoms (pions) and the relativistic properties of these particles within the ranges between the proton and neutron. By detecting high energy cosmic rays and the cascade particles from particle accelerator experiments, a zoo of particles, mesons and baryons was created <b>...</b> |
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| Time: 01:33:23 | More in Science & Technology |
Archive for mayo 20, 2012
Richard Feynman on Quantum Mechanics – Part 4 – New Queries.
Richard Feynman on Quantum Mechanics – Part 1 – Photons_ Corpuscles of Light.
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Richard Feynman on Quantum Mechanics - Part 1 - Photons: Corpuscles of Light 1:17:57 - ichard Feynman gives us a lecture on Quantum Electrodynamics, the theory of photons and electron interactions which incorporates his unique view of the fundamental processes that create it. One of the 3 winners of the 1965 Nobel Prize in Physics for his work, Feynman is an expert on quantum mechanics and developed the path integral formulation of relativistic quantum mechanics used in Quantum Field Theory. He interpreted the Born series of scattering amplitudes as vertices and Green's function propagators in his famous diagrams, the Feynman Diagrams, and also worked on the fundamental excitations in liquid helium leading to a correct model describing superfluidity using phonons, maxons and rotons to describe the various excitation curves. Other fields of work include the Feynman-Hellmann Theorem, which can relate the derivative of the total energy of any system to the expectation value of the derivative of the Hamiltonian under a single parameter (eg: volume). He also worked on the Rogers Commission report during the investigation of the 1986 Space Shuttle Challenger disaster, where Feynman famously demonstrated how the Booster Rocket O-rings, which are elastic sealing joints, became less resilient and subject to seal failures at ice-cold temperatures by immersing a sample of the material in a glass of ice water. His high intelligence and independent way of looking at the world often <b>...</b> |
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| Time: 01:17:58 | More in Science & Technology |
THE SIXTH EXTINCTION
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THE SIXTH EXTINCTION Throughout the history of evolution five great catastrophes have affected the Earth’s surface. After them, life had to re-organize itself as of the surviving species. Today, 27.000 species disappear each year, a figure equal or higher than the one which devastated the Earth during the previous extinction processes. Are we facing the Sixth Extinction? Is human being responsible for this ecological disaster? This documentary investigates these questions to offer a track to find answers. |
Rating 0/10 Views 24 Duration 50:32 |
THE SIXTH EXTINCTION
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THE SIXTH EXTINCTION Throughout the history of evolution five great catastrophes have affected the Earth’s surface. After them, life had to re-organize itself as of the surviving species. Today, 27.000 species disappear each year, a figure equal or higher than the one which devastated the Earth during the previous extinction processes. Are we facing the Sixth Extinction? Is human being responsible for this ecological disaster? This documentary investigates these questions to offer a track to find answers. |
Rating 0/10 Views 32 Duration 50:32 |
Richard Feynman on Quantum Mechanics – Part 3 – Electrons and their Interactions.
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Richard Feynman gives us a lecture on Quantum Electrodynamics, the theory of photons and electron interactions which incorporates his unique view of the fundamental processes that create it. One of the 3 winners of the 1965 Nobel Prize in Physics for his work, Feynman is an expert on quantum mechanics and developed the path integral formulation of relativistic quantum mechanics used in Quantum Field Theory. He interpreted the Born series of scattering amplitudes as vertices and Green's function propagators in his famous diagrams, the Feynman Diagrams, and also worked on the fundamental excitations in liquid helium leading to a correct model describing superfluidity using phonons, maxons and rotons to describe the various excitation curves. Other fields of work include the Feynman-Hellmann Theorem, which can relate the derivative of the total energy of any system to the expectation value of the derivative of the Hamiltonian under a single parameter (eg: volume). He also worked on the Rogers Commission report during the investigation of the 1986 Space Shuttle Challenger disaster, where Feynman famously demonstrated how the Booster Rocket O-rings, which are elastic sealing joints, became less resilient and subject to seal failures at ice-cold temperatures by immersing a sample of the material in a glass of ice water. His high intelligence and independent way of looking at the world often made him "a real pain" in the eyes of other, less skilled, commission members. Feynman's <b>...</b> |
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| Time: 00:00 | More in Science & Technology |
Richard Feynman on Quantum Mechanics – Part 2 – Reflection and Quantum Behaviour.
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Lecture Description Richard Feynman gives us a lecture on Quantum Electrodynamics, the theory of photons and electron interactions which incorporates his unique view of the fundamental processes that create it. One of the 3 winners of the 1965 Nobel Prize in Physics for his work, Feynman is an expert on quantum mechanics and developed the path integral formulation of relativistic quantum mechanics used in Quantum Field Theory. He interpreted the Born series of scattering amplitudes as vertices and Green's function propagators in his famous diagrams, the Feynman Diagrams, and also worked on the fundamental excitations in liquid helium leading to a correct model describing superfluidity using phonons, maxons and rotons to describe the various excitation curves. Other fields of work include the Feynman-Hellmann Theorem, which can relate the derivative of the total energy of any system to the expectation value of the derivative of the Hamiltonian under a single parameter (eg: volume). He also worked on the Rogers Commission report during the investigation of the 1986 Space Shuttle Challenger disaster, where Feynman famously demonstrated how the Booster Rocket O-rings, which are elastic sealing joints, became less resilient and subject to seal failures at ice-cold temperatures by immersing a sample of the material in a glass of ice water. His high intelligence and independent way of looking at the world often made him "a real pain" in the eyes of other, less skilled <b>...</b> |
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| Time: 01:38:51 | More in Science & Technology |
The ITER Project. Further Development Towards a DEMO Fusion Power Plant (4/4)
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"Further Development Towards a DEMO Fusion Power Plant," Guenter Janeschitz (sobre DEMO, el futuro de ITER) Fusion Technology for ITER, the ITER Project. Further Development Towards a DEMO Fusion Power Plant (4/4) Janeschitz, Guenter (speaker) (ITER Organization, France CERN. Geneva (Academic Training Lecture Regular Programme ; 2010-2011) Academic Training Lecture Regular Programme cdsweb.cern.ch |
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| Time: 01:08:19 | More in Science & Technology |
The ITER Project. Further Development Towards a DEMO Fusion Power Plant (3/4)
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"Fusion Technology for ITER, the ITER Project," Guenter Janeschitz (por qué ITER es como es) Fusion Technology for ITER, the ITER Project. Further Development Towards a DEMO Fusion Power Plant (3/4) Janeschitz, Guenter (speaker) CERN. Geneva (Academic Training Lecture Regular Programme ; 2010-2011) Academic Training Lecture Regular Programme Abstract This is the second half of a lecture series on fusion and will concentrate on fusion technology. The early phase of fusion development was concentrated on physics. However, during the 1980s it was realized that if one wanted to enter the area of fusion reactor plasmas, even in an experimental machine, a significant advance in fusion technologies would be needed. After several conceptual studies of reactor class fusion devices in the 1980s the engineering design phase of ITER started in earnest during the 1990s. The design team was in the beginning confronted with many challenges in the fusion technology area as well as in physics for which no readily available solution existed and in a few cases it was thought that solutions may be impossible to find. However, after the initial 3 years of intensive design and R&D; work in an international framework utilizing basic fusion technology R&D; from the previous decade it became clear that for all problems a conceptual solution could be found and further developed. In the first lecture several of the most challenging problems and their solution will be described. It will be shown <b>...</b> |
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| Time: 01:06:51 | More in Science & Technology |
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