آیینه

همه ما هر روز صبح و شب و عصر و همش دیگه می ریم جلوی آییه برای اینکه سر و وضعمون رو مرتب کنیم

ادامه نوشته

Rigged Hilbert Space

آيا اين فضاي هيلبرتي كه ما توي كوانتوم مكانيك ازش استفاده مي كنيم همون فضاي هيلبرتي هست كه رياضيدان ها تعريف مي كنند؟

ادامه نوشته

جزوه کوانتوم دکتر کریمی پور مدیر گروه شریف

قبلا جزوه یک رو گذاشتم حالا می خوام که جزوه کوانتوم ۲ رو بذارم. قبلا ۱۲ درسنامه اول رو گذاشتم و حالا می خوام که بقیه رو بذارم.

ادامه نوشته

Is the moon there when nobody looks?

آیا هنگامی که هیچ کس به ماه نمی نگرد ماه در سر جای خود است؟

ادامه نوشته

بحث اصول کوانتوم (زنگ تفریح!)

سلام به خودم و حومه!

من امتحانام رو به خوبی و خوشی گند زدم و حالا اومدم ببینم کی میخواد چی بگه؟!!

اول از همه، یاد صادقیان خدا بیامرز افتادم که پیشنهاد داد همه بحثای راجع به کوانتوم و اصول رو یه جا جمع کنم.

من به عقل خیلی زیادم رجوع کردم و پس از تامل بسیار بر آن شدم که فرم سوال و جواب و بحث و دعوا و.... ای که داشت، باز هم حفظ بشه.

متاسفانه من انسانی خودخواه هستم، پس بیشتر حرفهایی که خودم زدم رو جمع آوری کردم. شاکی نشید!

بحث های مربوط به علیت رو مطرح نکردم، چون به نظرم نباید با این بحث ها قاطی بشن.

این متن هنوز کامل نیست، اگه چیزی از قلم افتاده، بگید تا اصلاحش کنم.

ادامه نوشته

باز هم کوانتوم!

نه به اون موقع که این همه از کوانتوم میترسیدم، نه به حالا که ..... البته حالا هم از کوانتوم میترسم! فقط شکل ترس عوض شده! از این حرفای متافیزیکی که بگذرم، میرسم به این که: یه سوال بپرسم؟

ادامه نوشته

سوال امتحان

امتحان كوانتوممون دو تا سوال داشت،سوال اولش كه ساده بود اما سوال دوم!!!!!

ادامه نوشته

تاملي دوباره پيرامون عليت

آيا آمار صرفا يك راه ميان بر براي رسيدن به بعضي از نتايج علمي است يا آنكه حاكي از اين است كه هيچ همبستگي علي بر جهان حكمفرما نيست؟؟!!

ادامه نوشته

جزوه درسی کوانتوم دکتر کریمی پور مدیر گروه شریف

بحث هایی در دو پست قبل شکل گرفته است که من نمی توانم در ان شرکت کنم ولی می توانم شما به این جزوه درسی رجوع دهم

درسنامه 12 ام

http://s5.picofile.com/file/8114207000/QM12_RADIAL_SHRODINGER_EQUATION_HYDROGEN_.pdf.html

ادامه نوشته

معرفی چند کتاب فارسی در زمینه کوانتوم مکانیک

من این چند تا کتاب رو برای کوانتوم خوندم کتاب های خوبی بودن

ادامه نوشته

الکترومغناطیس و کوانتوم

این هفته سرکلاس الکترو مغناطیس وکوانتوم کلی سوال برام پیش اومد که دوست دارم باهم در موردش بحث کنیم یه عالمه مطلب توی ذهنمه که واقعا نمی تونم درکش کنم امیدوارم بتونیم به نتایج جالبی برسیم

ادامه نوشته

Time line of quantum mechanics

    1900 Paul Villard discovers gamma-rays while studying uranium decay

    1900 Johannes Rydberg refines the expression for observed hydrogen line wavelengths

  1900 Max Planck states his quantum hypothesis and blackbody radiation law

 1902 Philipp Lenard observes that maximum photoelectron energies are independent of  illuminating intensity but depend on frequency

  1902 Theodor Svedberg suggests that fluctuations in molecular bombardment cause the    Brownian motion

  1905 Albert Einstein explains the photoelectric effect

  1906 Charles Barkla discovers that each element has a characteristic X-ray and that the  degree of penetration of these X-rays is related to the atomic weight of the element

  1909 Hans Geiger and Ernest Marsden discover large angle deflections of alpha particles by  thin metal foils

  1909 Ernest Rutherford and Thomas Royds demonstrate that alpha particles are doubly   ionized helium atoms

  1911 Ernest Rutherford explains the Geiger-Marsden experiment by invoking a nuclear atom model and derives the Rutherford cross section

  1911 Jean Perrin proves the existence of atoms and molecules

1912 Max von Laue suggests using crystal lattices to diffract X-rays

1912 Walter Friedrich and Paul Knipping diffract X-rays in zinc blende

1913 William Henry Bragg and William Lawrence Bragg work out the Bragg condition for strong X-ray reflection

1913 Henry Moseley shows that nuclear charge is the real basis for numbering the elements

1913 Niels Bohr presents his quantum model of the atom

1913 Robert Millikan measures the fundamental unit of electric charge

1913 Johannes Stark demonstrates that strong electric fields will split the Balmer spectral line series of hydrogen

1914 James Franck and Gustav Hertz observe atomic excitation

1914 Ernest Rutherford suggests that the positively charged atomic nucleus contains protons

1915 Arnold Sommerfeld develops a modified Bohr atomic model with elliptic orbits to explain relativistic fine structure

1916 Gilbert N. Lewis and Irving Langmuir formulate an electron shell model of chemical bonding

1917 Albert Einstein introduces the idea of stimulated radiation emission

1921 Alfred Landé introduces the Landé g-factor

1922 Arthur Compton studies X-ray photon scattering by electrons

1922 Otto Stern and Walther Gerlach show "space quantization"

1923 Louis de Broglie suggests that electrons may have wavelike properties

1923 Lise Meitner discovers the Auger process

1924 John Lennard-Jones proposes a semiempirical interatomic force law

1924 Satyendra Bose and Albert Einstein introduce Bose-Einstein statistics

1925 Wolfgang Pauli states the quantum exclusion principle

1925 George Uhlenbeck and Samuel Goudsmit postulate electron spin

1925 Pierre Auger discovers the Auger process (2 years after Lise Meitner)

1925 Werner Heisenberg, Max Born, and Pascual Jordan formulate quantum matrix mechanics

1926 Erwin Schrödinger states his nonrelativistic quantum wave equation and formulates quantum wave mechanics

1926 Erwin Schrödinger proves that the wave and matrix formulations of quantum theory are mathematically equivalent

1926 Oskar Klein and Walter Gordon state their relativistic quantum wave equation, now the Klein-Gordon equation

1926 Enrico Fermi discovers the spin-statistics connection

1926 Paul Dirac introduces Fermi-Dirac statistics

1927 Clinton Davisson, Lester Germer, and George Paget Thomson confirm the wavelike nature of electrons

1927 Werner Heisenberg states the quantum uncertainty principle

1927 Max Born interprets the probabilistic nature of wavefunctions

1927 Walter Heitler and Fritz London introduce the concepts of valence bond theory and apply it to the hydrogen molecule.

1927 Thomas and Fermi develop the Thomas-Fermi model

1927 Max Born and Robert Oppenheimer introduce the Born-Oppenheimer approximation

1928 Chandrasekhara Raman studies optical photon scattering by electrons

1928 Paul Dirac states his relativistic electron quantum wave equation

1928 Charles G. Darwin and Walter Gordon solve the Dirac equation for a Coulomb potential

1928 Friedrich Hund and Robert S. Mulliken introduce the concept of molecular orbital

1929 Oskar Klein discovers the Klein paradox

1929 Oskar Klein and Yoshio Nishina derive the Klein-Nishina cross section for high energy photon scattering by electrons

1929 Nevill Mott derives the Mott cross section for the Coulomb scattering of relativistic electrons

1930 Paul Dirac introduces electron hole theory

1930 Erwin Schrödinger predicts the zitterbewegung motion

1930 Fritz London explains van der Waals forces as due to the interacting fluctuating dipole moments between molecules

1931 John Lennard-Jones proposes the Lennard-Jones interatomic potential

1931 Irène Joliot-Curie and Frédéric Joliot observe but misinterpret neutron scattering in paraffin

1931 Wolfgang Pauli puts forth the neutrino hypothesis to explain the apparent violation of energy conservation in beta decay

1931 Linus Pauling discovers resonance bonding and uses it to explain the high stability of symmetric planar molecules

1931 Paul Dirac shows that charge quantization can be explained if magnetic monopoles exist

1931 Harold Urey discovers deuterium using evaporation concentration techniques and spectroscopy

1932 John Cockcroft and Ernest Walton split lithium and boron nuclei using proton bombardment

1932 James Chadwick discovers the neutron

1932 Werner Heisenberg presents the proton-neutron model of the nucleus and uses it to explain isotopes

1932 Carl D. Anderson discovers the positron

1933 Ernst Stueckelberg (1932), Lev Davidovich Landau (1932), and Clarence Zener discover the Landau-Zener transition

1933 Max Delbruck suggests that quantum effects will cause photons to be scattered by an external electric field

1934 Irène Joliot-Curie and Frédéric Joliot bombard aluminum atoms with alpha particles to create artificially radioactive phosphorus-30

1934 Leó Szilárd realizes that nuclear chain reactions may be possible

1934 Enrico Fermi formulates his theory of beta decay

1934 Lev Davidovich Landau tells Edward Teller that nonlinear molecules may have vibrational modes which remove the degeneracy of an orbitally degenerate state (Jahn-Teller effect)

1934 Enrico Fermi suggests bombarding uranium atoms with neutrons to make a 93 proton element

1934 Pavel Alekseyevich Cherenkov reports that light is emitted by relativistic particles traveling in a nonscintillating liquid

1935 Hideki Yukawa presents a theory of strong interactions and predicts mesons

1935 Albert Einstein, Boris Podolsky, and Nathan Rosen put forth the EPR paradox

1935 Henry Eyring develop the transition state theory

1935 Niels Bohr presents his analysis of the EPR paradox

1936 Eugene Wigner develops the theory of neutron absorption by atomic nuclei

1936 Hermann Arthur Jahn and Edward Teller present their systematic study of the symmetry types for which the Jahn-Teller effect is expected

1937 Hans Hellmann finds the Hellmann-Feynman theorem

1937 Seth Neddermeyer, Carl Anderson, J.C. Street, and E.C. Stevenson discover muons using cloud chamber measurements of cosmic rays

1939 Richard Feynman finds the Hellmann-Feynman theorem

1939 Otto Hahn and Fritz Strassmann bombard uranium salts with thermal neutrons and discover barium among the reaction products

1939 Lise Meitner and Otto Robert Frisch determine that nuclear fission is taking place in the Hahn-Strassmann experiments

1942 Enrico Fermi makes the first controlled nuclear chain reaction

1942 Ernst Stueckelberg introduces the propagator to positron theory and interprets positrons as negative energy electrons moving backwards through spacetime

1943 Sin-Itiro Tomonaga publishes his paper on the basic physical principles of quantum electrodynamics

1947 Willis Lamb and Robert Retheford measure the Lamb-Retheford shift

1947 Cecil Powell, César Lattes, and Giuseppe Occhialini discover the pi-meson by studying cosmic ray tracks

1947 Richard Feynman presents his propagator approach to quantum electrodynamics

1948 Hendrik Casimir predicts a rudimentary attractive Casimir force on a parallel plate capacitor

1951 Martin Deutsch discovers positronium

1952 David Bohm propose his interpretation of quantum mechanics

1953 Robert Wilson observes Delbruck scattering of 1.33 MeV gamma-rays by the electric fields of lead nuclei

1954 Chen Ning Yang and Robert Mills investigate a theory of hadronic isospin by demanding local gauge invariance under isotopic spin space rotations---first non-Abelian gauge theory

1955 Owen Chamberlain, Emilio Segrè, Clyde Wiegand, and Thomas Ypsilantis discover the antiproton

1956 Frederick Reines and Clyde Cowan detect antineutrino

1956 Chen Ning Yang and Tsung Lee propose parity violation by the weak nuclear force

1956 Chien Shiung Wu discovers parity violation by the weak force in decaying cobalt

1957 Gerhart Luders proves the CPT theorem

1957 Richard Feynman, Murray Gell-Mann, Robert Marshak, and E.C.G. Sudarshan propose a vector/axial vector (VA) Lagrangian for weak interactions

1958 Marcus Sparnaay experimentally confirms the Casimir effect

1959 Yakir Aharonov and David Bohm predict the Aharonov-Bohm effect

1960 R.G. Chambers experimentally confirms the Aharonov-Bohm effect

1961 Murray Gell-Mann and Yuval Ne'eman discover the Eightfold Way patterns---SU(3) group

1961 Jeffrey Goldstone considers the breaking of global phase symmetry

1962 Leon Lederman shows that the electron neutrino is distinct from the muon neutrino

منبع:

سایت wikipedia.org

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