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幻灯片 1
幻灯片 1

Power Point Presentation
Power Point Presentation

... Greek Four-element View of Matter Each element is a combination of two properties: Fire = hot + dry Earth = cold + dry Water = cold + wet Air = hot + wet Aristotle’s definition of an element: Let us define the Element in bodies as that into which other bodies may be analyzed, which are present in t ...
Freezing of Reality: Is Flow of Time Real?
Freezing of Reality: Is Flow of Time Real?

... According to some hypotheses, there is no sense talking about time before the beginning of the universe. In other words, time has no “beginning”: it emerges in a certain region of space-time (close to that what we call the Big Bang) from one of four dimensions that have a spatial character (Hawking, ...
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Introduction to Magnetic Storms

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BEC and optical lattices

... Melvin Lax, Wei Cai, and Min Xu, Random Processes in Physics and Finance, Oxford University Press, 2006 Neil F. Johnson, Paul Jefferies, and Pak Ming Hui, Financial Market Complexity, Publ. Oxford University Press, 2003 Brief introduction: T.H. Johnson, Non-equilibrium strongly-correlated dynamics, ...
Slide 1
Slide 1

... constant h itself, but the product of h and the frequency. The quantization implies that a photon of blue light of given frequency or wavelength will always have the same size quantum of energy. For example, a photon of blue light of wavelength 450 nm will always have 2.76 eV of energy. It occurs in ...
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physical world

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Types of Radioactive Decay

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M ‘R B

... Magnets in the curved segments of these accelerators send the particles around the bend. Each revolution of the ring increases the momentum of the particle; each momentum increase requires a stronger turning force; these stronger forces come from adjusting the field of the bending magnets. Electroma ...
Effective Topological Field Theories in Condensed Matter Physics
Effective Topological Field Theories in Condensed Matter Physics

... The search for new states of matter The search for new elements led to a golden age of chemistry. The search for new particles led to the golden age of particle physics. In condensed matter physics, we ask what are the fundamental states of matter? In the classical world we have solid, liquid and g ...
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Phonon-like excitations in the two-state Bose

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DeBroglie Hypothesis

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The Kinetic Theory of Gases (1)

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... this electric field (since it would give a zero field) Valid when length scales of the phenomena are larger than the Debye length The current is divergence free The displacement current is neglected (this assumption restricts us to low frequency waves: no light waves). ...
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Elementary particle



In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is unknown whether it is composed of other particles. Known elementary particles include the fundamental fermions (quarks, leptons, antiquarks, and antileptons), which generally are ""matter particles"" and ""antimatter particles"", as well as the fundamental bosons (gauge bosons and Higgs boson), which generally are ""force particles"" that mediate interactions among fermions. A particle containing two or more elementary particles is a composite particle.Everyday matter is composed of atoms, once presumed to be matter's elementary particles—atom meaning ""indivisible"" in Greek—although the atom's existence remained controversial until about 1910, as some leading physicists regarded molecules as mathematical illusions, and matter as ultimately composed of energy. Soon, subatomic constituents of the atom were identified. As the 1930s opened, the electron and the proton had been observed, along with the photon, the particle of electromagnetic radiation. At that time, the recent advent of quantum mechanics was radically altering the conception of particles, as a single particle could seemingly span a field as would a wave, a paradox still eluding satisfactory explanation.Via quantum theory, protons and neutrons were found to contain quarks—up quarks and down quarks—now considered elementary particles. And within a molecule, the electron's three degrees of freedom (charge, spin, orbital) can separate via wavefunction into three quasiparticles (holon, spinon, orbiton). Yet a free electron—which, not orbiting an atomic nucleus, lacks orbital motion—appears unsplittable and remains regarded as an elementary particle.Around 1980, an elementary particle's status as indeed elementary—an ultimate constituent of substance—was mostly discarded for a more practical outlook, embodied in particle physics' Standard Model, science's most experimentally successful theory. Many elaborations upon and theories beyond the Standard Model, including the extremely popular supersymmetry, double the number of elementary particles by hypothesizing that each known particle associates with a ""shadow"" partner far more massive, although all such superpartners remain undiscovered. Meanwhile, an elementary boson mediating gravitation—the graviton—remains hypothetical.
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